Merge branch 'master' into viewport

# Conflicts: # imgui.cpp # imgui_internal.h
2024-12-19 06:26:35 +00:00 · 2018-12-11 12:41:40 +01:00 · 2018-12-11 12:41:40 +01:00 · c40feabe4d
commit c40feabe4d
parent 26b9e2d0a5 54a60aaa40
8 changed files with 1374 additions and 23 deletions
--- a/docs/CHANGELOG.txt
+++ b/docs/CHANGELOG.txt
@ -39,6 +39,17 @@ Breaking Changes:
  The addition of new configuration options in the Docking branch is pushing for a little reorganization of those names.
 Other Changes:
 - Added BETA api for Tab Bar/Tabs widgets: (#261, #351)
  - Added BeginTabBar(), EndTabBar(), BeginTabItem(), EndTabItem(), SetTabItemClosed() API.
  - Added ImGuiTabBarFlags flags for BeginTabBar().
  - Added ImGuiTabItemFlags flags for BeginTabItem().
  - Style: Added ImGuiCol_Tab, ImGuiCol_TabHovered, ImGuiCol_TabActive, ImGuiCol_TabUnfocused, ImGuiCol_TabUnfocusedActive colors.
  - Demo: Added Layout->Tabs demo code.
  - Demo: Added "Documents" example app showcasing possible use for tabs.
  This feature was merged from the Docking branch in order to allow the use of regular tabs in your code.
  (It does not provide the docking/splitting/merging of windows available in the Docking branch)
 - Added ImGuiWindowFlags_UnsavedDocument window flag to append '*' to title without altering 
  the ID, as a convenience to avoid using the ### operator.
 - Resizing windows from edge is now enabled by default (io.ConfigWindowsResizeFromEdges=true). Note that 
  it only works _if_ the back-end sets ImGuiBackendFlags_HasMouseCursors, which the standard back-end do.
 - Added io.ConfigWindowsMoveFromTitleBarOnly option. Still is ignored by window with no title bars (often popups).
--- a/docs/TODO.txt
+++ b/docs/TODO.txt
@ -127,7 +127,8 @@ It's mostly a bunch of personal notes, probably incomplete. Feel free to query i
 - dock: docking extension
 - dock: dock out from a collapsing header? would work nicely but need emitting window to keep submitting the code.
- - tabs: re-ordering, close buttons, context menu, persistent order (#261, #351)
+ - tabs: make EndTabBar fail if users doesn't respect BeginTabBar return value, for consistency/future-proofing.
 - tabs: persistent order/focus in BeginTabBar() api (#261, #351)
 - ext: stl-ish friendly extension (imgui_stl.h) that has wrapper for std::string, std::vector etc.
--- a/imgui.cpp
+++ b/imgui.cpp
@ -1036,6 +1036,8 @@ ImGuiStyle::ImGuiStyle()
    ScrollbarRounding       = 9.0f;             // Radius of grab corners rounding for scrollbar
    GrabMinSize             = 10.0f;            // Minimum width/height of a grab box for slider/scrollbar
    GrabRounding            = 0.0f;             // Radius of grabs corners rounding. Set to 0.0f to have rectangular slider grabs.
    TabRounding             = 4.0f;             // Radius of upper corners of a tab. Set to 0.0f to have rectangular tabs.
    TabBorderSize           = 0.0f;             // Thickness of border around tabs.
    ButtonTextAlign         = ImVec2(0.5f,0.5f);// Alignment of button text when button is larger than text.
    DisplayWindowPadding    = ImVec2(19,19);    // Window position are clamped to be visible within the display area or monitors by at least this amount. Only applies to regular windows.
    DisplaySafeAreaPadding  = ImVec2(3,3);      // If you cannot see the edge of your screen (e.g. on a TV) increase the safe area padding. Covers popups/tooltips as well regular windows.
@ -1059,6 +1061,7 @@ void ImGuiStyle::ScaleAllSizes(float scale_factor)
    PopupRounding = ImFloor(PopupRounding * scale_factor);
    FramePadding = ImFloor(FramePadding * scale_factor);
    FrameRounding = ImFloor(FrameRounding * scale_factor);
    TabRounding = ImFloor(TabRounding * scale_factor);
    ItemSpacing = ImFloor(ItemSpacing * scale_factor);
    ItemInnerSpacing = ImFloor(ItemInnerSpacing * scale_factor);
    TouchExtraPadding = ImFloor(TouchExtraPadding * scale_factor);
@ -2178,17 +2181,8 @@ void ImGui::RenderTextWrapped(ImVec2 pos, const char* text, const char* text_end
 // Default clip_rect uses (pos_min,pos_max)
 // Handle clipping on CPU immediately (vs typically let the GPU clip the triangles that are overlapping the clipping rectangle edges)
-void ImGui::RenderTextClipped(const ImVec2& pos_min, const ImVec2& pos_max, const char* text, const char* text_end, const ImVec2* text_size_if_known, const ImVec2& align, const ImRect* clip_rect)
+void ImGui::RenderTextClippedEx(ImDrawList* draw_list, const ImVec2& pos_min, const ImVec2& pos_max, const char* text, const char* text_display_end, const ImVec2* text_size_if_known, const ImVec2& align, const ImRect* clip_rect)
 {
    // Hide anything after a '##' string
    const char* text_display_end = FindRenderedTextEnd(text, text_end);
    const int text_len = (int)(text_display_end - text);
    if (text_len == 0)
        return;
    ImGuiContext& g = *GImGui;
    ImGuiWindow* window = g.CurrentWindow;
    // Perform CPU side clipping for single clipped element to avoid using scissor state
    ImVec2 pos = pos_min;
    const ImVec2 text_size = text_size_if_known ? *text_size_if_known : CalcTextSize(text, text_display_end, false, 0.0f);
@ -2207,14 +2201,27 @@ void ImGui::RenderTextClipped(const ImVec2& pos_min, const ImVec2& pos_max, cons
    if (need_clipping)
    {
        ImVec4 fine_clip_rect(clip_min->x, clip_min->y, clip_max->x, clip_max->y);
-        window->DrawList->AddText(g.Font, g.FontSize, pos, GetColorU32(ImGuiCol_Text), text, text_display_end, 0.0f, &fine_clip_rect);
+        draw_list->AddText(NULL, 0.0f, pos, GetColorU32(ImGuiCol_Text), text, text_display_end, 0.0f, &fine_clip_rect);
    }
    else
    {
-        window->DrawList->AddText(g.Font, g.FontSize, pos, GetColorU32(ImGuiCol_Text), text, text_display_end, 0.0f, NULL);
+        draw_list->AddText(NULL, 0.0f, pos, GetColorU32(ImGuiCol_Text), text, text_display_end, 0.0f, NULL);
    }
 }
 void ImGui::RenderTextClipped(const ImVec2& pos_min, const ImVec2& pos_max, const char* text, const char* text_end, const ImVec2* text_size_if_known, const ImVec2& align, const ImRect* clip_rect)
 {
    // Hide anything after a '##' string
    const char* text_display_end = FindRenderedTextEnd(text, text_end);
    const int text_len = (int)(text_display_end - text);
    if (text_len == 0)
        return;
    ImGuiContext& g = *GImGui;
    ImGuiWindow* window = g.CurrentWindow;
    RenderTextClippedEx(window->DrawList, pos_min, pos_max, text, text_display_end, text_size_if_known, align, clip_rect);
    if (g.LogEnabled)
-        LogRenderedText(&pos, text, text_display_end);
+        LogRenderedText(&pos_min, text, text_display_end);
 }
 // Render a rectangle shaped with optional rounding and borders
@ -2346,7 +2353,7 @@ ImGuiWindow::ImGuiWindow(ImGuiContext* context, const char* name)
    Name = ImStrdup(name);
    ID = ImHash(name, 0);
    IDStack.push_back(ID);
-    Flags = FlagsPreviousFrame = 0;
+    Flags = FlagsPreviousFrame = ImGuiWindowFlags_None;
    Viewport = NULL;
    ViewportId = 0;
    ViewportAllowPlatformMonitorExtend = -1;
@ -2648,7 +2655,7 @@ bool ImGui::ItemAdd(const ImRect& bb, ImGuiID id, const ImRect* nav_bb_arg)
    window->DC.LastItemId = id;
    window->DC.LastItemRect = bb;
-    window->DC.LastItemStatusFlags = 0;
+    window->DC.LastItemStatusFlags = ImGuiItemStatusFlags_None;
 #ifdef IMGUI_ENABLE_TEST_ENGINE
    ImGuiTestEngineHook_ItemAdd(id, bb);
@ -4224,7 +4231,8 @@ bool ImGui::IsItemDeactivatedAfterEdit()
 bool ImGui::IsItemFocused()
 {
    ImGuiContext& g = *GImGui;
-    return g.NavId && !g.NavDisableHighlight && g.NavId == g.CurrentWindow->DC.LastItemId;
+    ImGuiWindow* window = g.CurrentWindow;
    return g.NavId && !g.NavDisableHighlight && g.NavId == window->DC.LastItemId;
 }
 bool ImGui::IsItemClicked(int mouse_button)
@ -5407,9 +5415,11 @@ bool ImGui::Begin(const char* name, bool* p_open, ImGuiWindowFlags flags)
            window->DC.NavLayerCurrentMask = (1 << ImGuiNavLayer_Main);
            window->DC.ItemFlags = item_flags_backup;
-            // Title bar text (with: horizontal alignment, avoiding collapse/close button)
+            // Title bar text (with: horizontal alignment, avoiding collapse/close button, optional "unsaved document" marker)
            // FIXME: Refactor text alignment facilities along with RenderText helpers, this is too much code..
-            ImVec2 text_size = CalcTextSize(name, NULL, true);
+            const char* UNSAVED_DOCUMENT_MARKER = "*";
            float marker_size_x = (flags & ImGuiWindowFlags_UnsavedDocument) ? CalcTextSize(UNSAVED_DOCUMENT_MARKER, NULL, false).x : 0.0f;
            ImVec2 text_size = CalcTextSize(name, NULL, true) + ImVec2(marker_size_x, 0.0f);
            ImRect text_r = title_bar_rect;
            float pad_left = (flags & ImGuiWindowFlags_NoCollapse) ? style.FramePadding.x : (style.FramePadding.x + g.FontSize + style.ItemInnerSpacing.x);
            float pad_right = (p_open == NULL)                     ? style.FramePadding.x : (style.FramePadding.x + g.FontSize + style.ItemInnerSpacing.x);
@ -5420,6 +5430,12 @@ bool ImGui::Begin(const char* name, bool* p_open, ImGuiWindowFlags flags)
            ImRect clip_rect = text_r;
            clip_rect.Max.x = window->Pos.x + window->Size.x - (p_open ? title_bar_rect.GetHeight() - 3 : style.FramePadding.x); // Match the size of CloseButton()
            RenderTextClipped(text_r.Min, text_r.Max, name, NULL, &text_size, style.WindowTitleAlign, &clip_rect);
            if (flags & ImGuiWindowFlags_UnsavedDocument)
            {
                ImVec2 marker_pos = ImVec2(ImMax(text_r.Min.x, text_r.Min.x + (text_r.GetWidth() - text_size.x) * style.WindowTitleAlign.x) + text_size.x, text_r.Min.y) + ImVec2(2 - marker_size_x, 0.0f);
                ImVec2 off = ImVec2(0.0f, (float)(int)(-g.FontSize * 0.25f));
                RenderTextClipped(marker_pos + off, text_r.Max + off, UNSAVED_DOCUMENT_MARKER, NULL, NULL, ImVec2(0, style.WindowTitleAlign.y), &clip_rect);
            }
        }
        // Save clipped aabb so we can access it in constant-time in FindHoveredWindow()
@ -5825,6 +5841,7 @@ static const ImGuiStyleVarInfo GStyleVarInfo[] =
    { ImGuiDataType_Float, 1, (ImU32)IM_OFFSETOF(ImGuiStyle, ScrollbarRounding) },  // ImGuiStyleVar_ScrollbarRounding
    { ImGuiDataType_Float, 1, (ImU32)IM_OFFSETOF(ImGuiStyle, GrabMinSize) },        // ImGuiStyleVar_GrabMinSize
    { ImGuiDataType_Float, 1, (ImU32)IM_OFFSETOF(ImGuiStyle, GrabRounding) },       // ImGuiStyleVar_GrabRounding
    { ImGuiDataType_Float, 1, (ImU32)IM_OFFSETOF(ImGuiStyle, TabRounding) },        // ImGuiStyleVar_TabRounding
    { ImGuiDataType_Float, 2, (ImU32)IM_OFFSETOF(ImGuiStyle, ButtonTextAlign) },    // ImGuiStyleVar_ButtonTextAlign
 };
@ -5917,6 +5934,11 @@ const char* ImGui::GetStyleColorName(ImGuiCol idx)
    case ImGuiCol_ResizeGrip: return "ResizeGrip";
    case ImGuiCol_ResizeGripHovered: return "ResizeGripHovered";
    case ImGuiCol_ResizeGripActive: return "ResizeGripActive";
    case ImGuiCol_Tab: return "Tab";
    case ImGuiCol_TabHovered: return "TabHovered";
    case ImGuiCol_TabActive: return "TabActive";
    case ImGuiCol_TabUnfocused: return "TabUnfocused";
    case ImGuiCol_TabUnfocusedActive: return "TabUnfocusedActive";
    case ImGuiCol_PlotLines: return "PlotLines";
    case ImGuiCol_PlotLinesHovered: return "PlotLinesHovered";
    case ImGuiCol_PlotHistogram: return "PlotHistogram";
@ -8421,7 +8443,7 @@ static void ImGui::NavUpdate()
    if (g.NavMoveRequestForward == ImGuiNavForward_None)
    {
        g.NavMoveDir = ImGuiDir_None;
-        g.NavMoveRequestFlags = 0;
+        g.NavMoveRequestFlags = ImGuiNavMoveFlags_None;
        if (g.NavWindow && !g.NavWindowingTarget && allowed_dir_flags && !(g.NavWindow->Flags & ImGuiWindowFlags_NoNavInputs))
        {
            if ((allowed_dir_flags & (1<<ImGuiDir_Left))  && IsNavInputPressedAnyOfTwo(ImGuiNavInput_DpadLeft, ImGuiNavInput_KeyLeft_, ImGuiInputReadMode_Repeat)) g.NavMoveDir = ImGuiDir_Left;
@ -8779,7 +8801,9 @@ static void ImGui::NavUpdateWindowing()
    {
        // Move to parent menu if necessary
        ImGuiWindow* new_nav_window = g.NavWindow;
-        while ((new_nav_window->DC.NavLayerActiveMask & (1 << 1)) == 0 && (new_nav_window->Flags & ImGuiWindowFlags_ChildWindow) != 0 && (new_nav_window->Flags & (ImGuiWindowFlags_Popup | ImGuiWindowFlags_ChildMenu)) == 0)
+        while ((new_nav_window->DC.NavLayerActiveMask & (1 << 1)) == 0 
            && (new_nav_window->Flags & ImGuiWindowFlags_ChildWindow) != 0
            && (new_nav_window->Flags & (ImGuiWindowFlags_Popup | ImGuiWindowFlags_ChildMenu)) == 0)
            new_nav_window = new_nav_window->ParentWindow;
        if (new_nav_window != g.NavWindow)
        {
@ -9165,7 +9189,7 @@ void ImGui::ClearDragDrop()
    ImGuiContext& g = *GImGui;
    g.DragDropActive = false;
    g.DragDropPayload.Clear();
-    g.DragDropAcceptFlags = 0;
+    g.DragDropAcceptFlags = ImGuiDragDropFlags_None;
    g.DragDropAcceptIdCurr = g.DragDropAcceptIdPrev = 0;
    g.DragDropAcceptIdCurrRectSurface = FLT_MAX;
    g.DragDropAcceptFrameCount = -1;
@ -9449,6 +9473,12 @@ void ImGui::EndDragDropTarget()
    g.DragDropWithinSourceOrTarget = false;
 }
 //-----------------------------------------------------------------------------
 // [SECTION] DOCKING
 //-----------------------------------------------------------------------------
 // (this section is filled in the 'docking' branch)
 //-----------------------------------------------------------------------------
 // [SECTION] LOGGING/CAPTURING
 //-----------------------------------------------------------------------------
@ -10150,6 +10180,29 @@ void ImGui::ShowMetricsWindow(bool* p_open)
                ImGui::TreePop();
            }
        }
        static void NodeTabBar(ImGuiTabBar* tab_bar)
        {
            // Standalone tab bars (not associated to docking/windows functionality) currently hold no discernable strings.
            char buf[256];
            char* p = buf;
            const char* buf_end = buf + IM_ARRAYSIZE(buf);
            p += ImFormatString(p, buf_end - p, "TabBar (%d tabs)%s",
                tab_bar->Tabs.Size, (tab_bar->PrevFrameVisible < ImGui::GetFrameCount() - 2) ? " *Inactive*" : "");
            if (ImGui::TreeNode(tab_bar, "%s", buf))
            {
                for (int tab_n = 0; tab_n < tab_bar->Tabs.Size; tab_n++)
                {
                    const ImGuiTabItem* tab = &tab_bar->Tabs[tab_n];
                    ImGui::PushID(tab);
                    if (ImGui::SmallButton("<")) { TabBarQueueChangeTabOrder(tab_bar, tab, -1); } ImGui::SameLine(0, 2);
                    if (ImGui::SmallButton(">")) { TabBarQueueChangeTabOrder(tab_bar, tab, +1); } ImGui::SameLine();
                    ImGui::Text("%02d%c Tab 0x%08X", tab_n, (tab->ID == tab_bar->SelectedTabId) ? '*' : ' ', tab->ID);
                    ImGui::PopID();
                }
                ImGui::TreePop();
            }
        }
    };
    // Access private state, we are going to display the draw lists from last frame
@ -10186,6 +10239,12 @@ void ImGui::ShowMetricsWindow(bool* p_open)
        }
        ImGui::TreePop();
    }
    if (ImGui::TreeNode("TabBars", "Tab Bars (%d)", g.TabBars.Data.Size))
    {
        for (int n = 0; n < g.TabBars.Data.Size; n++)
            Funcs::NodeTabBar(g.TabBars.GetByIndex(n));
        ImGui::TreePop();
    }
    if (ImGui::TreeNode("Internal state"))
    {
        const char* input_source_names[] = { "None", "Mouse", "Nav", "NavKeyboard", "NavGamepad" }; IM_ASSERT(IM_ARRAYSIZE(input_source_names) == ImGuiInputSource_COUNT);
--- a/imgui.h
+++ b/imgui.h
@ -140,6 +140,8 @@ typedef int ImGuiFocusedFlags;      // -> enum ImGuiFocusedFlags_    // Flags: f
 typedef int ImGuiHoveredFlags;      // -> enum ImGuiHoveredFlags_    // Flags: for IsItemHovered(), IsWindowHovered() etc.
 typedef int ImGuiInputTextFlags;    // -> enum ImGuiInputTextFlags_  // Flags: for InputText*()
 typedef int ImGuiSelectableFlags;   // -> enum ImGuiSelectableFlags_ // Flags: for Selectable()
 typedef int ImGuiTabBarFlags;       // -> enum ImGuiTabBarFlags_     // Flags: for BeginTabBar()
 typedef int ImGuiTabItemFlags;      // -> enum ImGuiTabItemFlags_    // Flags: for BeginTabItem()
 typedef int ImGuiTreeNodeFlags;     // -> enum ImGuiTreeNodeFlags_   // Flags: for TreeNode*(),CollapsingHeader()
 typedef int ImGuiViewportFlags;     // -> enum ImGuiViewportFlags_   // Flags: for ImGuiViewport
 typedef int ImGuiWindowFlags;       // -> enum ImGuiWindowFlags_     // Flags: for Begin*()
@ -538,6 +540,14 @@ namespace ImGui
    IMGUI_API void          SetColumnOffset(int column_index, float offset_x);                  // set position of column line (in pixels, from the left side of the contents region). pass -1 to use current column
    IMGUI_API int           GetColumnsCount();
    // Tab Bars, Tabs
    // [BETA API] API may evolve!
    IMGUI_API bool          BeginTabBar(const char* str_id, ImGuiTabBarFlags flags = 0);        // create and append into a TabBar
    IMGUI_API void          EndTabBar();
    IMGUI_API bool          BeginTabItem(const char* label, bool* p_open = NULL, ImGuiTabItemFlags flags = 0);// create a Tab. Returns true if the Tab is selected.
    IMGUI_API void          EndTabItem();                                                       // only call EndTabItem() if BeginTabItem() returns true!
    IMGUI_API void          SetTabItemClosed(const char* tab_or_docked_window_label);           // notify TabBar or Docking system of a closed tab/window ahead (useful to reduce visual flicker on reorderable tab bars). For tab-bar: call after BeginTabBar() and before Tab submissions. Otherwise call with a window name.
    // Logging/Capture: all text output from interface is captured to tty/file/clipboard. By default, tree nodes are automatically opened during logging.
    IMGUI_API void          LogToTTY(int max_depth = -1);                                       // start logging to tty
    IMGUI_API void          LogToFile(int max_depth = -1, const char* filename = NULL);         // start logging to file
@ -547,7 +557,7 @@ namespace ImGui
    IMGUI_API void          LogText(const char* fmt, ...) IM_FMTARGS(1);                        // pass text data straight to log (without being displayed)
    // Drag and Drop
-    // [BETA API] Missing Demo code. API may evolve.
+    // [BETA API] Missing Demo code. API may evolve!
    IMGUI_API bool          BeginDragDropSource(ImGuiDragDropFlags flags = 0);                                      // call when the current item is active. If this return true, you can call SetDragDropPayload() + EndDragDropSource()
    IMGUI_API bool          SetDragDropPayload(const char* type, const void* data, size_t size, ImGuiCond cond = 0);// type is a user defined string of maximum 32 characters. Strings starting with '_' are reserved for dear imgui internal types. Data is copied and held by imgui.
    IMGUI_API void          EndDragDropSource();                                                                    // only call EndDragDropSource() if BeginDragDropSource() returns true!
@ -685,6 +695,7 @@ enum ImGuiWindowFlags_
    ImGuiWindowFlags_AlwaysUseWindowPadding = 1 << 16,  // Ensure child windows without border uses style.WindowPadding (ignored by default for non-bordered child windows, because more convenient)
    ImGuiWindowFlags_NoNavInputs            = 1 << 18,  // No gamepad/keyboard navigation within the window
    ImGuiWindowFlags_NoNavFocus             = 1 << 19,  // No focusing toward this window with gamepad/keyboard navigation (e.g. skipped by CTRL+TAB)
    ImGuiWindowFlags_UnsavedDocument        = 1 << 20,  // Append '*' to title without affecting the ID, as a convenience to avoid using the ### operator. When used in a tab/docking context, tab is selected on closure and closure is deferred by one frame to allow code to cancel the closure (with a confirmation popup, etc.) without flicker.
    ImGuiWindowFlags_NoNav                  = ImGuiWindowFlags_NoNavInputs | ImGuiWindowFlags_NoNavFocus,
    ImGuiWindowFlags_NoDecoration           = ImGuiWindowFlags_NoTitleBar | ImGuiWindowFlags_NoResize | ImGuiWindowFlags_NoScrollbar | ImGuiWindowFlags_NoCollapse,
    ImGuiWindowFlags_NoInputs               = ImGuiWindowFlags_NoMouseInputs | ImGuiWindowFlags_NoNavInputs | ImGuiWindowFlags_NoNavFocus,
@ -779,6 +790,31 @@ enum ImGuiComboFlags_
    ImGuiComboFlags_HeightMask_             = ImGuiComboFlags_HeightSmall | ImGuiComboFlags_HeightRegular | ImGuiComboFlags_HeightLarge | ImGuiComboFlags_HeightLargest
 };
 // Flags for ImGui::BeginTabBar()
 enum ImGuiTabBarFlags_
 {
    ImGuiTabBarFlags_None                           = 0,
    ImGuiTabBarFlags_Reorderable                    = 1 << 0,   // Allow manually dragging tabs to re-order them + New tabs are appended at the end of list
    ImGuiTabBarFlags_AutoSelectNewTabs              = 1 << 1,   // Automatically select new tabs when they appear
    ImGuiTabBarFlags_NoCloseWithMiddleMouseButton   = 1 << 2,   // Disable behavior of closing tabs (that are submitted with p_open != NULL) with middle mouse button. You can still repro this behavior on user's side with if (IsItemHovered() && IsMouseClicked(2)) *p_open = false.
    ImGuiTabBarFlags_NoTabListPopupButton           = 1 << 3,
    ImGuiTabBarFlags_NoTabListScrollingButtons      = 1 << 4,
    ImGuiTabBarFlags_FittingPolicyResizeDown        = 1 << 5,   // Resize tabs when they don't fit
    ImGuiTabBarFlags_FittingPolicyScroll            = 1 << 6,   // Add scroll buttons when tabs don't fit
    ImGuiTabBarFlags_FittingPolicyMask_             = ImGuiTabBarFlags_FittingPolicyResizeDown | ImGuiTabBarFlags_FittingPolicyScroll,
    ImGuiTabBarFlags_FittingPolicyDefault_          = ImGuiTabBarFlags_FittingPolicyResizeDown
 };  
 // Flags for ImGui::BeginTabItem()
 enum ImGuiTabItemFlags_
 {
    ImGuiTabItemFlags_None                          = 0,
    ImGuiTabItemFlags_UnsavedDocument               = 1 << 0,   // Append '*' to title without affecting the ID, as a convenience to avoid using the ### operator. Also: tab is selected on closure and closure is deferred by one frame to allow code to undo it without flicker.
    ImGuiTabItemFlags_SetSelected                   = 1 << 1,   // Trigger flag to programatically make the tab selected when calling BeginTabItem()
    ImGuiTabItemFlags_NoCloseWithMiddleMouseButton  = 1 << 2,   // Disable behavior of closing tabs (that are submitted with p_open != NULL) with middle mouse button. You can still repro this behavior on user's side with if (IsItemHovered() && IsMouseClicked(2)) *p_open = false.
    ImGuiTabItemFlags_NoPushId                      = 1 << 3    // Don't call PushID(tab->ID)/PopID() on BeginTabItem()/EndTabItem()
 };
 // Flags for ImGui::IsWindowFocused()
 enum ImGuiFocusedFlags_
 {
@ -989,6 +1025,11 @@ enum ImGuiCol_
    ImGuiCol_ResizeGrip,
    ImGuiCol_ResizeGripHovered,
    ImGuiCol_ResizeGripActive,
    ImGuiCol_Tab,
    ImGuiCol_TabHovered,
    ImGuiCol_TabActive,
    ImGuiCol_TabUnfocused,
    ImGuiCol_TabUnfocusedActive,
    ImGuiCol_PlotLines,
    ImGuiCol_PlotLinesHovered,
    ImGuiCol_PlotHistogram,
@ -1036,6 +1077,7 @@ enum ImGuiStyleVar_
    ImGuiStyleVar_ScrollbarRounding,   // float     ScrollbarRounding
    ImGuiStyleVar_GrabMinSize,         // float     GrabMinSize
    ImGuiStyleVar_GrabRounding,        // float     GrabRounding
    ImGuiStyleVar_TabRounding,         // float     TabRounding
    ImGuiStyleVar_ButtonTextAlign,     // ImVec2    ButtonTextAlign
    ImGuiStyleVar_COUNT
@ -1147,6 +1189,8 @@ struct ImGuiStyle
    float       ScrollbarRounding;          // Radius of grab corners for scrollbar.
    float       GrabMinSize;                // Minimum width/height of a grab box for slider/scrollbar.
    float       GrabRounding;               // Radius of grabs corners rounding. Set to 0.0f to have rectangular slider grabs.
    float       TabRounding;                // Radius of upper corners of a tab. Set to 0.0f to have rectangular tabs.
    float       TabBorderSize;              // Thickness of border around tabs. 
    ImVec2      ButtonTextAlign;            // Alignment of button text when button is larger than text. Defaults to (0.5f,0.5f) for horizontally+vertically centered.
    ImVec2      DisplayWindowPadding;       // Window position are clamped to be visible within the display area or monitors by at least this amount. Only applies to regular windows.
    ImVec2      DisplaySafeAreaPadding;     // If you cannot see the edges of your screen (e.g. on a TV) increase the safe area padding. Apply to popups/tooltips as well regular windows. NB: Prefer configuring your TV sets correctly!
--- a/imgui_demo.cpp
+++ b/imgui_demo.cpp
@ -40,6 +40,7 @@ Index of this file:
 // [SECTION] Example App: Simple Overlay / ShowExampleAppSimpleOverlay()
 // [SECTION] Example App: Manipulating Window Titles / ShowExampleAppWindowTitles()
 // [SECTION] Example App: Custom Rendering using ImDrawList API / ShowExampleAppCustomRendering()
 // [SECTION] Example App: Documents Handling / ShowExampleAppDocuments()
 */
@ -102,6 +103,7 @@ Index of this file:
 #if !defined(IMGUI_DISABLE_DEMO_WINDOWS)
 // Forward Declarations
 static void ShowExampleAppDocuments(bool* p_open);
 static void ShowExampleAppMainMenuBar();
 static void ShowExampleAppConsole(bool* p_open);
 static void ShowExampleAppLog(bool* p_open);
@ -168,6 +170,7 @@ static void ShowDemoWindowMisc();
 void ImGui::ShowDemoWindow(bool* p_open)
 {
    // Examples Apps (accessible from the "Examples" menu)
    static bool show_app_documents = false;
    static bool show_app_main_menu_bar = false;
    static bool show_app_console = false;
    static bool show_app_log = false;
@ -180,6 +183,7 @@ void ImGui::ShowDemoWindow(bool* p_open)
    static bool show_app_window_titles = false;
    static bool show_app_custom_rendering = false;
    if (show_app_documents)           ShowExampleAppDocuments(&show_app_documents);     // Process the Document app next, as it may also use a DockSpace()
    if (show_app_main_menu_bar)       ShowExampleAppMainMenuBar();
    if (show_app_console)             ShowExampleAppConsole(&show_app_console);
    if (show_app_log)                 ShowExampleAppLog(&show_app_log);
@ -264,6 +268,7 @@ void ImGui::ShowDemoWindow(bool* p_open)
            ImGui::MenuItem("Simple overlay", NULL, &show_app_simple_overlay);
            ImGui::MenuItem("Manipulating window titles", NULL, &show_app_window_titles);
            ImGui::MenuItem("Custom rendering", NULL, &show_app_custom_rendering);
            ImGui::MenuItem("Documents", NULL, &show_app_documents);
            ImGui::EndMenu();
        }
        if (ImGui::BeginMenu("Help"))
@ -1709,6 +1714,76 @@ static void ShowDemoWindowLayout()
        ImGui::TreePop();
    }
    if (ImGui::TreeNode("Tabs"))
    {
        if (ImGui::TreeNode("Basic"))
        {
            ImGuiTabBarFlags tab_bar_flags = ImGuiTabBarFlags_None;
            if (ImGui::BeginTabBar("MyTabBar", tab_bar_flags))
            {
                if (ImGui::BeginTabItem("Avocado"))
                {
                    ImGui::Text("This is the Avocado tab!\nblah blah blah blah blah");
                    ImGui::EndTabItem();
                }
                if (ImGui::BeginTabItem("Broccoli"))
                {
                    ImGui::Text("This is the Broccoli tab!\nblah blah blah blah blah");
                    ImGui::EndTabItem();
                }
                if (ImGui::BeginTabItem("Cucumber"))
                {
                    ImGui::Text("This is the Cucumber tab!\nblah blah blah blah blah");
                    ImGui::EndTabItem();
                }
                ImGui::EndTabBar();
            }
            ImGui::Separator();
            ImGui::TreePop();
        }
        if (ImGui::TreeNode("Advanced & Close Button"))
        {
            // Expose a couple of the available flags. In most cases you may just call BeginTabBar() with no flags (0).
            static ImGuiTabBarFlags tab_bar_flags = ImGuiTabBarFlags_Reorderable;
            ImGui::CheckboxFlags("ImGuiTabBarFlags_Reorderable", (unsigned int*)&tab_bar_flags, ImGuiTabBarFlags_Reorderable);
            ImGui::CheckboxFlags("ImGuiTabBarFlags_AutoSelectNewTabs", (unsigned int*)&tab_bar_flags, ImGuiTabBarFlags_AutoSelectNewTabs);
            ImGui::CheckboxFlags("ImGuiTabBarFlags_NoCloseWithMiddleMouseButton", (unsigned int*)&tab_bar_flags, ImGuiTabBarFlags_NoCloseWithMiddleMouseButton);
            if ((tab_bar_flags & ImGuiTabBarFlags_FittingPolicyMask_) == 0)
                tab_bar_flags |= ImGuiTabBarFlags_FittingPolicyDefault_;
            if (ImGui::CheckboxFlags("ImGuiTabBarFlags_FittingPolicyResizeDown", (unsigned int*)&tab_bar_flags, ImGuiTabBarFlags_FittingPolicyResizeDown))
                tab_bar_flags &= ~(ImGuiTabBarFlags_FittingPolicyMask_ ^ ImGuiTabBarFlags_FittingPolicyResizeDown);
            if (ImGui::CheckboxFlags("ImGuiTabBarFlags_FittingPolicyScroll", (unsigned int*)&tab_bar_flags, ImGuiTabBarFlags_FittingPolicyScroll))
                tab_bar_flags &= ~(ImGuiTabBarFlags_FittingPolicyMask_ ^ ImGuiTabBarFlags_FittingPolicyScroll);
            // Tab Bar
            const char* names[4] = { "Artichoke", "Beetroot", "Celery", "Daikon" };
            static bool opened[4] = { true, true, true, true }; // Persistent user state
            for (int n = 0; n < IM_ARRAYSIZE(opened); n++)
            {
                if (n > 0) { ImGui::SameLine(); }
                ImGui::Checkbox(names[n], &opened[n]);
            }
            // Passing a bool* to BeginTabItem() is similar to passing one to Begin(): the underlying bool will be set to false when the tab is closed.
            if (ImGui::BeginTabBar("MyTabBar", tab_bar_flags))
            {
                for (int n = 0; n < IM_ARRAYSIZE(opened); n++)
                    if (opened[n] && ImGui::BeginTabItem(names[n], &opened[n]))
                    {
                        ImGui::Text("This is the %s tab!", names[n]);
                        if (n & 1)
                            ImGui::Text("I am an odd tab.");
                        ImGui::EndTabItem();
                    }
                ImGui::EndTabBar();
            }
            ImGui::Separator();
            ImGui::TreePop();
        }
        ImGui::TreePop();
    }
    if (ImGui::TreeNode("Groups"))
    {
        ImGui::TextWrapped("(Using ImGui::BeginGroup()/EndGroup() to layout items. BeginGroup() basically locks the horizontal position. EndGroup() bundles the whole group so that you can use functions such as IsItemHovered() on it.)");
@ -2702,12 +2777,14 @@ void ImGui::ShowStyleEditor(ImGuiStyle* ref)
        ImGui::SliderFloat("ChildBorderSize", &style.ChildBorderSize, 0.0f, 1.0f, "%.0f");
        ImGui::SliderFloat("PopupBorderSize", &style.PopupBorderSize, 0.0f, 1.0f, "%.0f");
        ImGui::SliderFloat("FrameBorderSize", &style.FrameBorderSize, 0.0f, 1.0f, "%.0f");
        ImGui::SliderFloat("TabBorderSize", &style.TabBorderSize, 0.0f, 1.0f, "%.0f");
        ImGui::Text("Rounding");
        ImGui::SliderFloat("WindowRounding", &style.WindowRounding, 0.0f, 14.0f, "%.0f");
        ImGui::SliderFloat("ChildRounding", &style.ChildRounding, 0.0f, 16.0f, "%.0f");
        ImGui::SliderFloat("FrameRounding", &style.FrameRounding, 0.0f, 12.0f, "%.0f");
        ImGui::SliderFloat("ScrollbarRounding", &style.ScrollbarRounding, 0.0f, 12.0f, "%.0f");
        ImGui::SliderFloat("GrabRounding", &style.GrabRounding, 0.0f, 12.0f, "%.0f");
        ImGui::SliderFloat("TabRounding", &style.TabRounding, 0.0f, 12.0f, "%.0f");
        ImGui::Text("Alignment");
        ImGui::SliderFloat2("WindowTitleAlign", (float*)&style.WindowTitleAlign, 0.0f, 1.0f, "%.2f");
        ImGui::SliderFloat2("ButtonTextAlign", (float*)&style.ButtonTextAlign, 0.0f, 1.0f, "%.2f"); ImGui::SameLine(); ShowHelpMarker("Alignment applies when a button is larger than its text content.");
@ -3786,6 +3863,271 @@ static void ShowExampleAppCustomRendering(bool* p_open)
        if (adding_preview)
            points.pop_back();
    }
 }
 //-----------------------------------------------------------------------------
 // [SECTION] Example App: Documents Handling / ShowExampleAppDocuments()
 //-----------------------------------------------------------------------------
 // Simplified structure to mimic a Document model
 struct MyDocument
 {
    const char* Name;           // Document title
    bool        Open;           // Set when the document is open (in this demo, we keep an array of all available documents to simplify the demo)
    bool        OpenPrev;       // Copy of Open from last update.
    bool        Dirty;          // Set when the document has been modified
    bool        WantClose;      // Set when the document 
    ImVec4      Color;          // An arbitrary variable associated to the document
    MyDocument(const char* name, bool open = true, const ImVec4& color = ImVec4(1.0f,1.0f,1.0f,1.0f))
    { 
        Name = name; 
        Open = OpenPrev = open; 
        Dirty = false; 
        WantClose = false; 
        Color = color; 
    }
    void DoOpen()       { Open = true; }
    void DoQueueClose() { WantClose = true; }
    void DoForceClose() { Open = false; Dirty = false; }
    void DoSave()       { Dirty = false; }
    // Display dummy contents for the Document
    static void DisplayContents(MyDocument* doc)
    {
        ImGui::PushID(doc);
        ImGui::Text("Document \"%s\"", doc->Name);
        ImGui::PushStyleColor(ImGuiCol_Text, doc->Color);
        ImGui::TextWrapped("Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.");
        ImGui::PopStyleColor();
        if (ImGui::Button("Modify", ImVec2(100, 0)))
            doc->Dirty = true;
        ImGui::SameLine();
        if (ImGui::Button("Save", ImVec2(100, 0)))
            doc->DoSave();
        ImGui::ColorEdit3("color", &doc->Color.x);  // Useful to test drag and drop and hold-dragged-to-open-tab behavior.
        ImGui::PopID();
    }
    // Display context menu for the Document
    static void DisplayContextMenu(MyDocument* doc)
    {
        if (!ImGui::BeginPopupContextItem())
            return;
        char buf[256];
        sprintf(buf, "Save %s", doc->Name);
        if (ImGui::MenuItem(buf, "CTRL+S", false, doc->Open))
            doc->DoSave();
        if (ImGui::MenuItem("Close", "CTRL+W", false, doc->Open))
            doc->DoQueueClose();
        ImGui::EndPopup();
    }
 };
 struct ExampleAppDocuments
 {
    ImVector<MyDocument> Documents;
    ExampleAppDocuments()
    {
        Documents.push_back(MyDocument("Lettuce",             true,  ImVec4(0.4f, 0.8f, 0.4f, 1.0f)));
        Documents.push_back(MyDocument("Eggplant",            true,  ImVec4(0.8f, 0.5f, 1.0f, 1.0f)));
        Documents.push_back(MyDocument("Carrot",              true,  ImVec4(1.0f, 0.8f, 0.5f, 1.0f)));
        Documents.push_back(MyDocument("Tomato",              false, ImVec4(1.0f, 0.3f, 0.4f, 1.0f)));
        Documents.push_back(MyDocument("A Rather Long Title", false));
        Documents.push_back(MyDocument("Some Document",       false));
    }
 };
 // [Optional] Notify the system of Tabs/Windows closure that happened outside the regular tab interface.
 // If a tab has been closed programmatically (aka closed from another source such as the Checkbox() in the demo, as opposed
 // to clicking on the regular tab closing button) and stops being submitted, it will take a frame for the tab bar to notice its absence. 
 // During this frame there will be a gap in the tab bar, and if the tab that has disappeared was the selected one, the tab bar 
 // will report no selected tab during the frame. This will effectively give the impression of a flicker for one frame.
 // We call SetTabItemClosed() to manually notify the Tab Bar or Docking system of removed tabs to avoid this glitch.
 // Note that this completely optional, and only affect tab bars with the ImGuiTabBarFlags_Reorderable flag.
 static void NotifyOfDocumentsClosedElsewhere(ExampleAppDocuments& app)
 {
    for (int doc_n = 0; doc_n < app.Documents.Size; doc_n++)
    {
        MyDocument* doc = &app.Documents[doc_n];
        if (!doc->Open && doc->OpenPrev)
            ImGui::SetTabItemClosed(doc->Name);
        doc->OpenPrev = doc->Open;
    }
 }
 void ShowExampleAppDocuments(bool* p_open)
 {
    static ExampleAppDocuments app;
    ImGui::Begin("Examples: Documents", p_open, ImGuiWindowFlags_MenuBar);
    // Options
    static bool opt_reorderable = true;
    static ImGuiTabBarFlags opt_fitting_flags = ImGuiTabBarFlags_FittingPolicyDefault_;
    // Menu
    if (ImGui::BeginMenuBar())
    {
        if (ImGui::BeginMenu("File"))
        {
            int open_count = 0;
            for (int doc_n = 0; doc_n < app.Documents.Size; doc_n++)
                open_count += app.Documents[doc_n].Open ? 1 : 0;
            if (ImGui::BeginMenu("Open", open_count < app.Documents.Size))
            {
                for (int doc_n = 0; doc_n < app.Documents.Size; doc_n++)
                {
                    MyDocument* doc = &app.Documents[doc_n];
                    if (!doc->Open)
                        if (ImGui::MenuItem(doc->Name))
                            doc->DoOpen();
                }
                ImGui::EndMenu();
            }
            if (ImGui::MenuItem("Close All Documents", NULL, false, open_count > 0))
                for (int doc_n = 0; doc_n < app.Documents.Size; doc_n++)
                    app.Documents[doc_n].DoQueueClose();
            if (ImGui::MenuItem("Exit", "Alt+F4")) {}
            ImGui::EndMenu();
        }
        ImGui::EndMenuBar();
    }
    // [Debug] List documents with one checkbox for each
    for (int doc_n = 0; doc_n < app.Documents.Size; doc_n++)
    {
        MyDocument* doc = &app.Documents[doc_n];
        if (doc_n > 0)
            ImGui::SameLine();
        ImGui::PushID(doc);
        if (ImGui::Checkbox(doc->Name, &doc->Open))
            if (!doc->Open)
                doc->DoForceClose();
        ImGui::PopID();
    }
    ImGui::Separator();
    // Submit Tab Bar and Tabs
    {
        ImGuiTabBarFlags tab_bar_flags = (opt_fitting_flags) | (opt_reorderable ? ImGuiTabBarFlags_Reorderable : 0);
        if (ImGui::BeginTabBar("##tabs", tab_bar_flags))
        {
            if (opt_reorderable)
                NotifyOfDocumentsClosedElsewhere(app);
            // [DEBUG] Stress tests
            //if ((ImGui::GetFrameCount() % 30) == 0) docs[1].Open ^= 1;            // [DEBUG] Automatically show/hide a tab. Test various interactions e.g. dragging with this on.
            //if (ImGui::GetIO().KeyCtrl) ImGui::SetTabItemSelected(docs[1].Name);  // [DEBUG] Test SetTabItemSelected(), probably not very useful as-is anyway..
            // Submit Tabs
            for (int doc_n = 0; doc_n < app.Documents.Size; doc_n++)
            {
                MyDocument* doc = &app.Documents[doc_n];
                if (!doc->Open)
                    continue;
                ImGuiTabItemFlags tab_flags = (doc->Dirty ? ImGuiTabItemFlags_UnsavedDocument : 0);
                bool visible = ImGui::BeginTabItem(doc->Name, &doc->Open, tab_flags);
                // Cancel attempt to close when unsaved add to save queue so we can display a popup.
                if (!doc->Open && doc->Dirty)
                {
                    doc->Open = true;
                    doc->DoQueueClose();
                }
                MyDocument::DisplayContextMenu(doc);
                if (visible)
                {
                    MyDocument::DisplayContents(doc);
                    ImGui::EndTabItem();
                }
            }
            ImGui::EndTabBar();
        }
    }
    // Update closing queue
    static ImVector<MyDocument*> close_queue;
    if (close_queue.empty())
    {
        // Close queue is locked once we started a popup
        for (int doc_n = 0; doc_n < app.Documents.Size; doc_n++)
        {
            MyDocument* doc = &app.Documents[doc_n];
            if (doc->WantClose)
            {
                doc->WantClose = false;
                close_queue.push_back(doc);
            }
        }
    }
    // Display closing confirmation UI
    if (!close_queue.empty())
    {
        int close_queue_unsaved_documents = 0;
        for (int n = 0; n < close_queue.Size; n++)
            if (close_queue[n]->Dirty)
                close_queue_unsaved_documents++;
        if (close_queue_unsaved_documents == 0)
        {
            // Close documents when all are unsaved
            for (int n = 0; n < close_queue.Size; n++)
                close_queue[n]->DoForceClose();
            close_queue.clear();
        }
        else
        {
            if (!ImGui::IsPopupOpen("Save?"))
                ImGui::OpenPopup("Save?");
            if (ImGui::BeginPopupModal("Save?"))
            {
                ImGui::Text("Save change to the following items?");
                ImGui::PushItemWidth(-1.0f);
                ImGui::ListBoxHeader("##", close_queue_unsaved_documents, 6);
                for (int n = 0; n < close_queue.Size; n++)
                    if (close_queue[n]->Dirty)
                        ImGui::Text("%s", close_queue[n]->Name);
                ImGui::ListBoxFooter();
                if (ImGui::Button("Yes", ImVec2(80, 0)))
                {
                    for (int n = 0; n < close_queue.Size; n++)
                    {
                        if (close_queue[n]->Dirty)
                            close_queue[n]->DoSave();
                        close_queue[n]->DoForceClose();
                    }
                    close_queue.clear();
                    ImGui::CloseCurrentPopup();
                }
                ImGui::SameLine();
                if (ImGui::Button("No", ImVec2(80, 0)))
                {
                    for (int n = 0; n < close_queue.Size; n++)
                        close_queue[n]->DoForceClose();
                    close_queue.clear();
                    ImGui::CloseCurrentPopup();
                }
                ImGui::SameLine();
                if (ImGui::Button("Cancel", ImVec2(80, 0)))
                {
                    close_queue.clear();
                    ImGui::CloseCurrentPopup();
                }
                ImGui::EndPopup();
            }
        }
    }
    ImGui::End();
 }
--- a/imgui_draw.cpp
+++ b/imgui_draw.cpp
@ -205,6 +205,11 @@ void ImGui::StyleColorsDark(ImGuiStyle* dst)
    colors[ImGuiCol_ResizeGrip]             = ImVec4(0.26f, 0.59f, 0.98f, 0.25f);
    colors[ImGuiCol_ResizeGripHovered]      = ImVec4(0.26f, 0.59f, 0.98f, 0.67f);
    colors[ImGuiCol_ResizeGripActive]       = ImVec4(0.26f, 0.59f, 0.98f, 0.95f);
    colors[ImGuiCol_Tab]                    = ImLerp(colors[ImGuiCol_Header],       colors[ImGuiCol_TitleBgActive], 0.80f);
    colors[ImGuiCol_TabHovered]             = colors[ImGuiCol_HeaderHovered];
    colors[ImGuiCol_TabActive]              = ImLerp(colors[ImGuiCol_HeaderActive], colors[ImGuiCol_TitleBgActive], 0.60f);
    colors[ImGuiCol_TabUnfocused]           = ImLerp(colors[ImGuiCol_Tab],          colors[ImGuiCol_TitleBg], 0.80f);
    colors[ImGuiCol_TabUnfocusedActive]     = ImLerp(colors[ImGuiCol_TabActive],    colors[ImGuiCol_TitleBg], 0.40f);
    colors[ImGuiCol_PlotLines]              = ImVec4(0.61f, 0.61f, 0.61f, 1.00f);
    colors[ImGuiCol_PlotLinesHovered]       = ImVec4(1.00f, 0.43f, 0.35f, 1.00f);
    colors[ImGuiCol_PlotHistogram]          = ImVec4(0.90f, 0.70f, 0.00f, 1.00f);
@ -255,6 +260,11 @@ void ImGui::StyleColorsClassic(ImGuiStyle* dst)
    colors[ImGuiCol_ResizeGrip]             = ImVec4(1.00f, 1.00f, 1.00f, 0.16f);
    colors[ImGuiCol_ResizeGripHovered]      = ImVec4(0.78f, 0.82f, 1.00f, 0.60f);
    colors[ImGuiCol_ResizeGripActive]       = ImVec4(0.78f, 0.82f, 1.00f, 0.90f);
    colors[ImGuiCol_Tab]                    = ImLerp(colors[ImGuiCol_Header],       colors[ImGuiCol_TitleBgActive], 0.80f);
    colors[ImGuiCol_TabHovered]             = colors[ImGuiCol_HeaderHovered];
    colors[ImGuiCol_TabActive]              = ImLerp(colors[ImGuiCol_HeaderActive], colors[ImGuiCol_TitleBgActive], 0.60f);
    colors[ImGuiCol_TabUnfocused]           = ImLerp(colors[ImGuiCol_Tab],          colors[ImGuiCol_TitleBg], 0.80f);
    colors[ImGuiCol_TabUnfocusedActive]     = ImLerp(colors[ImGuiCol_TabActive],    colors[ImGuiCol_TitleBg], 0.40f);
    colors[ImGuiCol_PlotLines]              = ImVec4(1.00f, 1.00f, 1.00f, 1.00f);
    colors[ImGuiCol_PlotLinesHovered]       = ImVec4(0.90f, 0.70f, 0.00f, 1.00f);
    colors[ImGuiCol_PlotHistogram]          = ImVec4(0.90f, 0.70f, 0.00f, 1.00f);
@ -306,6 +316,11 @@ void ImGui::StyleColorsLight(ImGuiStyle* dst)
    colors[ImGuiCol_ResizeGrip]             = ImVec4(0.80f, 0.80f, 0.80f, 0.56f);
    colors[ImGuiCol_ResizeGripHovered]      = ImVec4(0.26f, 0.59f, 0.98f, 0.67f);
    colors[ImGuiCol_ResizeGripActive]       = ImVec4(0.26f, 0.59f, 0.98f, 0.95f);
    colors[ImGuiCol_Tab]                    = ImLerp(colors[ImGuiCol_Header],       colors[ImGuiCol_TitleBgActive], 0.90f);
    colors[ImGuiCol_TabHovered]             = colors[ImGuiCol_HeaderHovered];
    colors[ImGuiCol_TabActive]              = ImLerp(colors[ImGuiCol_HeaderActive], colors[ImGuiCol_TitleBgActive], 0.60f);
    colors[ImGuiCol_TabUnfocused]           = ImLerp(colors[ImGuiCol_Tab],          colors[ImGuiCol_TitleBg], 0.80f);
    colors[ImGuiCol_TabUnfocusedActive]     = ImLerp(colors[ImGuiCol_TabActive],    colors[ImGuiCol_TitleBg], 0.40f);
    colors[ImGuiCol_PlotLines]              = ImVec4(0.39f, 0.39f, 0.39f, 1.00f);
    colors[ImGuiCol_PlotLinesHovered]       = ImVec4(1.00f, 0.43f, 0.35f, 1.00f);
    colors[ImGuiCol_PlotHistogram]          = ImVec4(0.90f, 0.70f, 0.00f, 1.00f);
@ -2821,6 +2836,7 @@ void ImFont::RenderText(ImDrawList* draw_list, float size, ImVec2 pos, ImU32 col
 // - RenderMouseCursor()
 // - RenderArrowPointingAt()
 // - RenderRectFilledRangeH()
 // - RenderPixelEllipsis()
 //-----------------------------------------------------------------------------
 void ImGui::RenderMouseCursor(ImVec2 pos, float scale, ImGuiMouseCursor mouse_cursor)
@ -2940,6 +2956,15 @@ void ImGui::RenderRectFilledRangeH(ImDrawList* draw_list, const ImRect& rect, Im
    draw_list->PathFillConvex(col);
 }
 // FIXME: Rendering an ellipsis "..." is a surprisingly tricky problem for us... we cannot rely on font glyph having it, 
 // and regular dot are typically too wide. If we render a dot/shape ourselves it comes with the risk that it wouldn't match 
 // the boldness or positioning of what the font uses...
 void ImGui::RenderPixelEllipsis(ImDrawList* draw_list, ImFont* font, ImVec2 pos, int count, ImU32 col)
 {
    pos.y += (float)(int)(font->DisplayOffset.y + font->Ascent + 0.5f - 1.0f);
    for (int dot_n = 0; dot_n < count; dot_n++)
        draw_list->AddRectFilled(ImVec2(pos.x + dot_n * 2.0f, pos.y), ImVec2(pos.x + dot_n * 2.0f + 1.0f, pos.y + 1.0f), col);
 }
 //-----------------------------------------------------------------------------
 // [SECTION] Decompression code
--- a/imgui_internal.h
+++ b/imgui_internal.h
@ -49,6 +49,8 @@ struct ImGuiNextWindowData;         // Storage for SetNexWindow** functions
 struct ImGuiPopupRef;               // Storage for current popup stack
 struct ImGuiSettingsHandler;        // Storage for one type registered in the .ini file
 struct ImGuiStyleMod;               // Stacked style modifier, backup of modified data so we can restore it
 struct ImGuiTabBar;                 // Storage for a tab bar
 struct ImGuiTabItem;                // Storage for a tab item (within a tab bar)
 struct ImGuiWindow;                 // Storage for one window
 struct ImGuiWindowTempData;         // Temporary storage for one window (that's the data which in theory we could ditch at the end of the frame)
 struct ImGuiWindowSettings;         // Storage for window settings stored in .ini file (we keep one of those even if the actual window wasn't instanced during this session)
@ -732,6 +734,12 @@ struct ImGuiNextWindowData
    }
 };
 struct ImGuiTabBarSortItem
 {
    int         Index;
    float       Width;
 };
 //-----------------------------------------------------------------------------
 // Main imgui context
 //-----------------------------------------------------------------------------
@ -866,6 +874,11 @@ struct ImGuiContext
    ImVector<unsigned char> DragDropPayloadBufHeap;             // We don't expose the ImVector<> directly
    unsigned char           DragDropPayloadBufLocal[8];         // Local buffer for small payloads
    // Tab bars
    ImPool<ImGuiTabBar>     TabBars;
    ImVector<ImGuiTabBar*>  CurrentTabBar;
    ImVector<ImGuiTabBarSortItem>   TabSortByWidthBuffer;
    // Widget state
    ImGuiInputTextState     InputTextState;
    ImFont                  InputTextPasswordFont;
@ -1219,6 +1232,59 @@ struct ImGuiItemHoveredDataBackup
    void Restore() const    { ImGuiWindow* window = GImGui->CurrentWindow; window->DC.LastItemId = LastItemId; window->DC.LastItemStatusFlags = LastItemStatusFlags; window->DC.LastItemRect = LastItemRect; window->DC.LastItemDisplayRect = LastItemDisplayRect; }
 };
 //-----------------------------------------------------------------------------
 // Tab Bar, Tab Item
 //-----------------------------------------------------------------------------
 enum ImGuiTabBarFlagsPrivate_
 {
    ImGuiTabBarFlags_DockNode                   = 1 << 20,  // [Docking: Unused in Master Branch] Part of a dock node
    ImGuiTabBarFlags_DockNodeIsDockSpace        = 1 << 21,  // [Docking: Unused in Master Branch] Part of an explicit dockspace node node
    ImGuiTabBarFlags_IsFocused                  = 1 << 22,
    ImGuiTabBarFlags_SaveSettings               = 1 << 23   // FIXME: Settings are handled by the docking system, this only request the tab bar to mark settings dirty when reordering tabs
 };
 // Storage for one active tab item (sizeof() 26~32 bytes)
 struct ImGuiTabItem
 {
    ImGuiID             ID;
    ImGuiTabItemFlags   Flags;
    int                 LastFrameVisible;
    int                 LastFrameSelected;      // This allows us to infer an ordered list of the last activated tabs with little maintenance
    float               Offset;                 // Position relative to beginning of tab
    float               Width;                  // Width currently displayed
    float               WidthContents;          // Width of actual contents, stored during BeginTabItem() call
    ImGuiTabItem()      { ID = Flags = 0; LastFrameVisible = LastFrameSelected = -1; Offset = Width = WidthContents = 0.0f; }
 };
 // Storage for a tab bar (sizeof() 92~96 bytes)
 struct ImGuiTabBar
 {
    ImVector<ImGuiTabItem> Tabs;
    ImGuiID             ID;                     // Zero for tab-bars used by docking
    ImGuiID             SelectedTabId;          // Selected tab
    ImGuiID             NextSelectedTabId;
    ImGuiID             VisibleTabId;           // Can occasionally be != SelectedTabId (e.g. when previewing contents for CTRL+TAB preview)
    int                 CurrFrameVisible;
    int                 PrevFrameVisible;
    ImRect              BarRect;
    float               ContentsHeight;
    float               OffsetMax;              // Distance from BarRect.Min.x, locked during layout
    float               OffsetNextTab;          // Distance from BarRect.Min.x, incremented with each BeginTabItem() call, not used if ImGuiTabBarFlags_Reorderable if set.
    float               ScrollingAnim;
    float               ScrollingTarget;
    ImGuiTabBarFlags    Flags;
    ImGuiID             ReorderRequestTabId;
    int                 ReorderRequestDir;
    bool                WantLayout;
    bool                VisibleTabWasSubmitted;
    short               LastTabItemIdx;         // For BeginTabItem()/EndTabItem()
    ImGuiTabBar();
    int                 GetTabOrder(const ImGuiTabItem* tab) const { return Tabs.index_from_pointer(tab); }
 };
 //-----------------------------------------------------------------------------
 // Internal API
 // No guarantee of forward compatibility here.
@ -1342,12 +1408,24 @@ namespace ImGui
    IMGUI_API void          EndColumns();                                                             // close columns
    IMGUI_API void          PushColumnClipRect(int column_index = -1);
    // Tab Bars
    IMGUI_API bool          BeginTabBarEx(ImGuiTabBar* tab_bar, const ImRect& bb, ImGuiTabBarFlags flags);
    IMGUI_API ImGuiTabItem* TabBarFindTabByID(ImGuiTabBar* tab_bar, ImGuiID tab_id);
    IMGUI_API void          TabBarRemoveTab(ImGuiTabBar* tab_bar, ImGuiID tab_id);
    IMGUI_API void          TabBarCloseTab(ImGuiTabBar* tab_bar, ImGuiTabItem* tab);
    IMGUI_API void          TabBarQueueChangeTabOrder(ImGuiTabBar* tab_bar, const ImGuiTabItem* tab, int dir);
    IMGUI_API bool          TabItemEx(ImGuiTabBar* tab_bar, const char* label, bool* p_open, ImGuiTabItemFlags flags);
    IMGUI_API ImVec2        TabItemCalcSize(const char* label, bool has_close_button);
    IMGUI_API void          TabItemBackground(ImDrawList* draw_list, const ImRect& bb, ImGuiTabItemFlags flags, ImU32 col);
    IMGUI_API bool          TabItemLabelAndCloseButton(ImDrawList* draw_list, const ImRect& bb, ImGuiTabItemFlags flags, const char* label, ImGuiID tab_id, ImGuiID close_button_id);
    // Render helpers
    // AVOID USING OUTSIDE OF IMGUI.CPP! NOT FOR PUBLIC CONSUMPTION. THOSE FUNCTIONS ARE A MESS. THEIR SIGNATURE AND BEHAVIOR WILL CHANGE, THEY NEED TO BE REFACTORED INTO SOMETHING DECENT.
    // NB: All position are in absolute pixels coordinates (we are never using window coordinates internally)
    IMGUI_API void          RenderText(ImVec2 pos, const char* text, const char* text_end = NULL, bool hide_text_after_hash = true);
    IMGUI_API void          RenderTextWrapped(ImVec2 pos, const char* text, const char* text_end, float wrap_width);
    IMGUI_API void          RenderTextClipped(const ImVec2& pos_min, const ImVec2& pos_max, const char* text, const char* text_end, const ImVec2* text_size_if_known, const ImVec2& align = ImVec2(0,0), const ImRect* clip_rect = NULL);
    IMGUI_API void          RenderTextClippedEx(ImDrawList* draw_list, const ImVec2& pos_min, const ImVec2& pos_max, const char* text, const char* text_end, const ImVec2* text_size_if_known, const ImVec2& align = ImVec2(0, 0), const ImRect* clip_rect = NULL);
    IMGUI_API void          RenderFrame(ImVec2 p_min, ImVec2 p_max, ImU32 fill_col, bool border = true, float rounding = 0.0f);
    IMGUI_API void          RenderFrameBorder(ImVec2 p_min, ImVec2 p_max, float rounding = 0.0f);
    IMGUI_API void          RenderColorRectWithAlphaCheckerboard(ImVec2 p_min, ImVec2 p_max, ImU32 fill_col, float grid_step, ImVec2 grid_off, float rounding = 0.0f, int rounding_corners_flags = ~0);
@ -1362,6 +1440,7 @@ namespace ImGui
    // Render helpers (those functions don't access any ImGui state!)
    IMGUI_API void          RenderArrowPointingAt(ImDrawList* draw_list, ImVec2 pos, ImVec2 half_sz, ImGuiDir direction, ImU32 col);
    IMGUI_API void          RenderRectFilledRangeH(ImDrawList* draw_list, const ImRect& rect, ImU32 col, float x_start_norm, float x_end_norm, float rounding);
    IMGUI_API void          RenderPixelEllipsis(ImDrawList* draw_list, ImFont* font, ImVec2 pos, int count, ImU32 col);
    // Widgets
    IMGUI_API bool          ButtonEx(const char* label, const ImVec2& size_arg = ImVec2(0,0), ImGuiButtonFlags flags = 0);
--- a/imgui_widgets.cpp
+++ b/imgui_widgets.cpp
@ -22,6 +22,8 @@ Index of this file:
 // [SECTION] Widgets: PlotLines, PlotHistogram
 // [SECTION] Widgets: Value helpers
 // [SECTION] Widgets: MenuItem, BeginMenu, EndMenu, etc.
 // [SECTION] Widgets: BeginTabBar, EndTabBar, etc.
 // [SECTION] Widgets: BeginTabItem, EndTabItem, etc.
 */
@ -5753,3 +5755,791 @@ bool ImGui::MenuItem(const char* label, const char* shortcut, bool* p_selected,
    }
    return false;
 }
 //-------------------------------------------------------------------------
 // [SECTION] Widgets: BeginTabBar, EndTabBar, etc.
 //-------------------------------------------------------------------------
 // [BETA API] API may evolve! This code has been extracted out of the Docking branch,
 // and some of the construct which are not used in Master may be left here to facilitate merging.
 //-------------------------------------------------------------------------
 // - BeginTabBar()
 // - BeginTabBarEx() [Internal]
 // - EndTabBar()
 // - TabBarLayout() [Internal]
 // - TabBarCalcTabID() [Internal]
 // - TabBarCalcMaxTabWidth() [Internal]
 // - TabBarFindTabById() [Internal]
 // - TabBarRemoveTab() [Internal]
 // - TabBarCloseTab() [Internal]
 // - TabBarScrollClamp()v
 // - TabBarScrollToTab() [Internal]
 // - TabBarQueueChangeTabOrder() [Internal]
 // - TabBarScrollingButtons() [Internal]
 //-------------------------------------------------------------------------
 namespace ImGui
 {
    static void             TabBarLayout(ImGuiTabBar* tab_bar);
    static ImU32            TabBarCalcTabID(ImGuiTabBar* tab_bar, const char* label);
    static float            TabBarCalcMaxTabWidth();
    static float            TabBarScrollClamp(ImGuiTabBar* tab_bar, float scrolling);
    static void             TabBarScrollToTab(ImGuiTabBar* tab_bar, ImGuiTabItem* tab);
    static ImGuiTabItem*    TabBarScrollingButtons(ImGuiTabBar* tab_bar);
 }
 ImGuiTabBar::ImGuiTabBar()
 {
    ID = 0;
    SelectedTabId = NextSelectedTabId = VisibleTabId = 0;
    CurrFrameVisible = PrevFrameVisible = -1;
    OffsetMax = OffsetNextTab = 0.0f;
    ScrollingAnim = ScrollingTarget = 0.0f;
    Flags = ImGuiTabBarFlags_None;
    ReorderRequestTabId = 0;
    ReorderRequestDir = 0;
    WantLayout = VisibleTabWasSubmitted = false;
    LastTabItemIdx = -1;
 }
 static int IMGUI_CDECL TabItemComparerByVisibleOffset(const void* lhs, const void* rhs)
 {
    const ImGuiTabItem* a = (const ImGuiTabItem*)lhs;
    const ImGuiTabItem* b = (const ImGuiTabItem*)rhs;
    return (int)(a->Offset - b->Offset);
 }
 static int IMGUI_CDECL TabBarSortItemComparer(const void* lhs, const void* rhs)
 {
    const ImGuiTabBarSortItem* a = (const ImGuiTabBarSortItem*)lhs;
    const ImGuiTabBarSortItem* b = (const ImGuiTabBarSortItem*)rhs;
    if (int d = (int)(b->Width - a->Width))
        return d;
    return (b->Index - a->Index);
 }
 bool    ImGui::BeginTabBar(const char* str_id, ImGuiTabBarFlags flags)
 {
    ImGuiContext& g = *GImGui;
    ImGuiWindow* window = g.CurrentWindow;
    if (window->SkipItems)
        return false;
    ImGuiID id = window->GetID(str_id);
    ImGuiTabBar* tab_bar = g.TabBars.GetOrAddByKey(id);
    ImRect tab_bar_bb = ImRect(window->DC.CursorPos.x, window->DC.CursorPos.y, window->InnerClipRect.Max.x, window->DC.CursorPos.y + g.FontSize + g.Style.FramePadding.y * 2);
    tab_bar->ID = id;
    return BeginTabBarEx(tab_bar, tab_bar_bb, flags | ImGuiTabBarFlags_IsFocused);
 }
 bool    ImGui::BeginTabBarEx(ImGuiTabBar* tab_bar, const ImRect& tab_bar_bb, ImGuiTabBarFlags flags)
 {
    ImGuiContext& g = *GImGui;
    ImGuiWindow* window = g.CurrentWindow;
    if (window->SkipItems)
        return false;
    if ((flags & ImGuiTabBarFlags_DockNode) == 0)
        window->IDStack.push_back(tab_bar->ID);
    g.CurrentTabBar.push_back(tab_bar);
    if (tab_bar->CurrFrameVisible == g.FrameCount)
    {
        //printf("[%05d] BeginTabBarEx already called this frame\n", g.FrameCount);
        IM_ASSERT(0);
        return true;
    }
    // When toggling back from ordered to manually-reorderable, shuffle tabs to enforce the last visible order. 
    // Otherwise, the most recently inserted tabs would move at the end of visible list which can be a little too confusing or magic for the user.
    if ((flags & ImGuiTabBarFlags_Reorderable) && !(tab_bar->Flags & ImGuiTabBarFlags_Reorderable) && tab_bar->Tabs.Size > 1 && tab_bar->PrevFrameVisible != -1)
        ImQsort(tab_bar->Tabs.Data, tab_bar->Tabs.Size, sizeof(ImGuiTabItem), TabItemComparerByVisibleOffset);
    // Flags
    if ((flags & ImGuiTabBarFlags_FittingPolicyMask_) == 0)
        flags |= ImGuiTabBarFlags_FittingPolicyDefault_;
    tab_bar->Flags = flags;
    tab_bar->BarRect = tab_bar_bb;
    tab_bar->WantLayout = true; // Layout will be done on the first call to ItemTab()
    tab_bar->PrevFrameVisible = tab_bar->CurrFrameVisible;
    tab_bar->CurrFrameVisible = g.FrameCount;
    // Layout    
    ItemSize(ImVec2(tab_bar->OffsetMax, tab_bar->BarRect.GetHeight()));
    window->DC.CursorPos.x = tab_bar->BarRect.Min.x;
    // Draw separator
    const ImU32 col = GetColorU32((flags & ImGuiTabBarFlags_IsFocused) ? ImGuiCol_TabActive : ImGuiCol_Tab);
    const float y = tab_bar->BarRect.Max.y - 1.0f;
    {
        const float separator_min_x = tab_bar->BarRect.Min.x - ((flags & ImGuiTabBarFlags_DockNodeIsDockSpace) ? 0.0f : window->WindowPadding.x);
        const float separator_max_x = tab_bar->BarRect.Max.x + ((flags & ImGuiTabBarFlags_DockNodeIsDockSpace) ? 0.0f : window->WindowPadding.x);
        window->DrawList->AddLine(ImVec2(separator_min_x, y), ImVec2(separator_max_x, y), col, 1.0f);
    }
    return true;
 }
 void    ImGui::EndTabBar()
 {
    ImGuiContext& g = *GImGui;
    ImGuiWindow* window = g.CurrentWindow;
    if (window->SkipItems)
        return;
    IM_ASSERT(!g.CurrentTabBar.empty());      // Mismatched BeginTabBar/EndTabBar
    ImGuiTabBar* tab_bar = g.CurrentTabBar.back();
    if (tab_bar->WantLayout)
        TabBarLayout(tab_bar);
    // Restore the last visible height if no tab is visible, this reduce vertical flicker/movement when a tabs gets removed without calling SetTabItemClosed().
    const bool tab_bar_appearing = (tab_bar->PrevFrameVisible + 1 < g.FrameCount);
    if (tab_bar->VisibleTabWasSubmitted || tab_bar->VisibleTabId == 0 || tab_bar_appearing)
        tab_bar->ContentsHeight = ImMax(window->DC.CursorPos.y - tab_bar->BarRect.Max.y, 0.0f);
    else
        window->DC.CursorPos.y = tab_bar->BarRect.Max.y + tab_bar->ContentsHeight;
    if ((tab_bar->Flags & ImGuiTabBarFlags_DockNode) == 0)
        PopID();
    g.CurrentTabBar.pop_back();
 }
 // This is called only once a frame before by the first call to ItemTab()
 // The reason we're not calling it in BeginTabBar() is to leave a chance to the user to call the SetTabItemClosed() functions.
 static void ImGui::TabBarLayout(ImGuiTabBar* tab_bar)
 {
    ImGuiContext& g = *GImGui;
    tab_bar->WantLayout = false;
    // Garbage collect
    int tab_dst_n = 0;
    for (int tab_src_n = 0; tab_src_n < tab_bar->Tabs.Size; tab_src_n++)
    {
        ImGuiTabItem* tab = &tab_bar->Tabs[tab_src_n];
        if (tab->LastFrameVisible < tab_bar->PrevFrameVisible)
        {
            if (tab->ID == tab_bar->SelectedTabId)
                tab_bar->SelectedTabId = 0;
            continue;
        }
        if (tab_dst_n != tab_src_n)
            tab_bar->Tabs[tab_dst_n] = tab_bar->Tabs[tab_src_n];
        tab_dst_n++;
    }
    if (tab_bar->Tabs.Size != tab_dst_n)
        tab_bar->Tabs.resize(tab_dst_n);
    // Setup next selected tab
    ImGuiID scroll_track_selected_tab_id = 0;
    if (tab_bar->NextSelectedTabId)
    {
        tab_bar->SelectedTabId = tab_bar->NextSelectedTabId;
        tab_bar->NextSelectedTabId = 0;
        scroll_track_selected_tab_id = tab_bar->SelectedTabId;
    }
    // Process order change request (we could probably process it when requested but it's just saner to do it in a single spot).
    if (tab_bar->ReorderRequestTabId != 0)
    {
        if (ImGuiTabItem* tab1 = TabBarFindTabByID(tab_bar, tab_bar->ReorderRequestTabId))
        {
            //IM_ASSERT(tab_bar->Flags & ImGuiTabBarFlags_Reorderable); // <- this may happen when using debug tools
            int tab2_order = tab_bar->GetTabOrder(tab1) + tab_bar->ReorderRequestDir;
            if (tab2_order >= 0 && tab2_order < tab_bar->Tabs.Size)
            {
                ImGuiTabItem* tab2 = &tab_bar->Tabs[tab2_order];
                ImGuiTabItem item_tmp = *tab1;
                *tab1 = *tab2;
                *tab2 = item_tmp;
                if (tab2->ID == tab_bar->SelectedTabId)
                    scroll_track_selected_tab_id = tab2->ID;
                tab1 = tab2 = NULL;
            }
            if (tab_bar->Flags & ImGuiTabBarFlags_SaveSettings)
                MarkIniSettingsDirty();
        }
        tab_bar->ReorderRequestTabId = 0;
    }
    ImVector<ImGuiTabBarSortItem>& width_sort_buffer = g.TabSortByWidthBuffer;
    width_sort_buffer.resize(tab_bar->Tabs.Size);
    // Compute ideal widths
    float width_total_contents = 0.0f;
    ImGuiTabItem* most_recently_selected_tab = NULL;
    bool found_selected_tab_id = false;
    for (int tab_n = 0; tab_n < tab_bar->Tabs.Size; tab_n++)
    {
        ImGuiTabItem* tab = &tab_bar->Tabs[tab_n];
        IM_ASSERT(tab->LastFrameVisible >= tab_bar->PrevFrameVisible);
        if (most_recently_selected_tab == NULL || most_recently_selected_tab->LastFrameSelected < tab->LastFrameSelected)
            most_recently_selected_tab = tab;
        if (tab->ID == tab_bar->SelectedTabId)
            found_selected_tab_id = true;
        // Refresh tab width immediately if we can (for manual tab bar, WidthContent will lag by one frame which is mostly noticeable when changing style.FramePadding.x)
        // Additionally, when using TabBarAddTab() to manipulate tab bar order we occasionally insert new tabs that don't have a width yet, 
        // and we cannot wait for the next BeginTabItem() call. We cannot compute this width within TabBarAddTab() because font size depends on the active window.
        width_total_contents += (tab_n > 0 ? g.Style.ItemInnerSpacing.x : 0.0f) + tab->WidthContents;
        // Store data so we can build an array sorted by width if we need to shrink tabs down
        width_sort_buffer[tab_n].Index = tab_n;
        width_sort_buffer[tab_n].Width = tab->WidthContents;
    }
    // Compute width
    const float width_avail = tab_bar->BarRect.GetWidth();
    float width_excess = (width_avail < width_total_contents) ? (width_total_contents - width_avail) : 0.0f;
    if (width_excess > 0.0f && (tab_bar->Flags & ImGuiTabBarFlags_FittingPolicyResizeDown))
    {
        // If we don't have enough room, resize down the largest tabs first
        if (tab_bar->Tabs.Size > 1)
            ImQsort(width_sort_buffer.Data, (size_t)width_sort_buffer.Size, sizeof(ImGuiTabBarSortItem), TabBarSortItemComparer);
        int tab_count_same_width = 1;
        while (width_excess > 0.0f && tab_count_same_width < tab_bar->Tabs.Size)
        {
            while (tab_count_same_width < tab_bar->Tabs.Size && width_sort_buffer[0].Width == width_sort_buffer[tab_count_same_width].Width)
                tab_count_same_width++;
            float width_to_remove_per_tab_max = (tab_count_same_width < tab_bar->Tabs.Size) ? (width_sort_buffer[0].Width - width_sort_buffer[tab_count_same_width].Width) : (width_sort_buffer[0].Width - 1.0f);
            float width_to_remove_per_tab = ImMin(width_excess / tab_count_same_width, width_to_remove_per_tab_max);
            for (int tab_n = 0; tab_n < tab_count_same_width; tab_n++)
                width_sort_buffer[tab_n].Width -= width_to_remove_per_tab;
            width_excess -= width_to_remove_per_tab * tab_count_same_width;
        }
        for (int tab_n = 0; tab_n < tab_bar->Tabs.Size; tab_n++)
            tab_bar->Tabs[width_sort_buffer[tab_n].Index].Width = (float)(int)width_sort_buffer[tab_n].Width;
    }
    else
    {
        const float tab_max_width = TabBarCalcMaxTabWidth();
        for (int tab_n = 0; tab_n < tab_bar->Tabs.Size; tab_n++)
        {
            ImGuiTabItem* tab = &tab_bar->Tabs[tab_n];
            tab->Width = ImMin(tab->WidthContents, tab_max_width);
        }
    }
    // Layout all active tabs
    float offset_x = 0.0f;
    for (int tab_n = 0; tab_n < tab_bar->Tabs.Size; tab_n++)
    {
        ImGuiTabItem* tab = &tab_bar->Tabs[tab_n];
        tab->Offset = offset_x;
        if (scroll_track_selected_tab_id == 0 && g.NavJustMovedToId == tab->ID)
            scroll_track_selected_tab_id = tab->ID;
        offset_x += tab->Width + g.Style.ItemInnerSpacing.x;
    }
    tab_bar->OffsetMax = ImMax(offset_x - g.Style.ItemInnerSpacing.x, 0.0f);
    tab_bar->OffsetNextTab = 0.0f;
    // Horizontal scrolling buttons
    const bool scrolling_buttons = (tab_bar->OffsetMax > tab_bar->BarRect.GetWidth() && tab_bar->Tabs.Size > 1) && !(tab_bar->Flags & ImGuiTabBarFlags_NoTabListScrollingButtons) && (tab_bar->Flags & ImGuiTabBarFlags_FittingPolicyScroll);
    if (scrolling_buttons)
        if (ImGuiTabItem* tab_to_select = TabBarScrollingButtons(tab_bar)) // NB: Will alter BarRect.Max.x!
            scroll_track_selected_tab_id = tab_bar->SelectedTabId = tab_to_select->ID;
    // If we have lost the selected tab, select the next most recently active one
    if (found_selected_tab_id == false)
        tab_bar->SelectedTabId = 0;
    if (tab_bar->SelectedTabId == 0 && tab_bar->NextSelectedTabId == 0 && most_recently_selected_tab != NULL)
        scroll_track_selected_tab_id = tab_bar->SelectedTabId = most_recently_selected_tab->ID;
    // Lock in visible tab
    tab_bar->VisibleTabId = tab_bar->SelectedTabId;
    tab_bar->VisibleTabWasSubmitted = false;
    // Update scrolling
    if (scroll_track_selected_tab_id)
        if (ImGuiTabItem* scroll_track_selected_tab = TabBarFindTabByID(tab_bar, scroll_track_selected_tab_id))
            TabBarScrollToTab(tab_bar, scroll_track_selected_tab);
    tab_bar->ScrollingAnim = TabBarScrollClamp(tab_bar, tab_bar->ScrollingAnim);
    tab_bar->ScrollingTarget = TabBarScrollClamp(tab_bar, tab_bar->ScrollingTarget);
    const float scrolling_speed = (tab_bar->PrevFrameVisible + 1 < g.FrameCount) ? FLT_MAX : (g.IO.DeltaTime * g.FontSize * 70.0f);
    if (tab_bar->ScrollingAnim != tab_bar->ScrollingTarget)
        tab_bar->ScrollingAnim = ImLinearSweep(tab_bar->ScrollingAnim, tab_bar->ScrollingTarget, scrolling_speed);
 }
 // Dockables uses Name/ID in the global namespace. Non-dockable items use the ID stack.
 static ImU32   ImGui::TabBarCalcTabID(ImGuiTabBar* tab_bar, const char* label)
 {
    if (tab_bar->Flags & ImGuiTabBarFlags_DockNode)
    {
        ImGuiID id = ImHash(label, 0);
        KeepAliveID(id);
        return id;
    }
    else
    {
        ImGuiWindow* window = GImGui->CurrentWindow;
        return window->GetID(label);
    }
 }
 static float ImGui::TabBarCalcMaxTabWidth()
 {
    ImGuiContext& g = *GImGui;
    return g.FontSize * 20.0f;
 }
 ImGuiTabItem* ImGui::TabBarFindTabByID(ImGuiTabBar* tab_bar, ImGuiID tab_id)
 {
    if (tab_id != 0)
        for (int n = 0; n < tab_bar->Tabs.Size; n++)
            if (tab_bar->Tabs[n].ID == tab_id)
                return &tab_bar->Tabs[n];
    return NULL;
 }
 // The *TabId fields be already set by the docking system _before_ the actual TabItem was created, so we clear them regardless.
 void ImGui::TabBarRemoveTab(ImGuiTabBar* tab_bar, ImGuiID tab_id)
 {
    if (ImGuiTabItem* tab = TabBarFindTabByID(tab_bar, tab_id))
        tab_bar->Tabs.erase(tab);
    if (tab_bar->VisibleTabId == tab_id)      { tab_bar->VisibleTabId = 0; }
    if (tab_bar->SelectedTabId == tab_id)     { tab_bar->SelectedTabId = 0; }
    if (tab_bar->NextSelectedTabId == tab_id) { tab_bar->NextSelectedTabId = 0; }
 }
 // Called on manual closure attempt
 void ImGui::TabBarCloseTab(ImGuiTabBar* tab_bar, ImGuiTabItem* tab)
 {
    if ((tab_bar->VisibleTabId == tab->ID) && !(tab->Flags & ImGuiTabItemFlags_UnsavedDocument))
    {
        // This will remove a frame of lag for selecting another tab on closure.
        // However we don't run it in the case where the 'Unsaved' flag is set, so user gets a chance to fully undo the closure
        tab->LastFrameVisible = -1;
        tab_bar->SelectedTabId = tab_bar->NextSelectedTabId = 0;
    }
    else if ((tab_bar->VisibleTabId != tab->ID) && (tab->Flags & ImGuiTabItemFlags_UnsavedDocument))
    {
        // Actually select before expecting closure
        tab_bar->NextSelectedTabId = tab->ID;
    }
 }
 static float ImGui::TabBarScrollClamp(ImGuiTabBar* tab_bar, float scrolling)
 {
    scrolling = ImMin(scrolling, tab_bar->OffsetMax - tab_bar->BarRect.GetWidth());
    return ImMax(scrolling, 0.0f);
 }
 static void ImGui::TabBarScrollToTab(ImGuiTabBar* tab_bar, ImGuiTabItem* tab)
 {
    ImGuiContext& g = *GImGui;
    float margin = g.FontSize * 1.0f; // When to scroll to make Tab N+1 visible always make a bit of N visible to suggest more scrolling area (since we don't have a scrollbar)
    int order = tab_bar->GetTabOrder(tab);
    float tab_x1 = tab->Offset + (order > 0 ? -margin : 0.0f);
    float tab_x2 = tab->Offset + tab->Width + (order + 1 < tab_bar->Tabs.Size ? margin : 1.0f);
    if (tab_bar->ScrollingTarget > tab_x1)
        tab_bar->ScrollingTarget = tab_x1;
    if (tab_bar->ScrollingTarget + tab_bar->BarRect.GetWidth() < tab_x2)
        tab_bar->ScrollingTarget = tab_x2 - tab_bar->BarRect.GetWidth();
 }
 void ImGui::TabBarQueueChangeTabOrder(ImGuiTabBar* tab_bar, const ImGuiTabItem* tab, int dir)
 {
    IM_ASSERT(dir == -1 || dir == +1);
    IM_ASSERT(tab_bar->ReorderRequestTabId == 0);
    tab_bar->ReorderRequestTabId = tab->ID;
    tab_bar->ReorderRequestDir = dir;
 }
 static ImGuiTabItem* ImGui::TabBarScrollingButtons(ImGuiTabBar* tab_bar)
 {
    ImGuiContext& g = *GImGui;
    ImGuiWindow* window = g.CurrentWindow;
    const ImVec2 arrow_button_size(g.FontSize - 2.0f, g.FontSize + g.Style.FramePadding.y * 2.0f);
    const float scrolling_buttons_width = arrow_button_size.x * 2.0f;
    const ImVec2 backup_cursor_pos = window->DC.CursorPos;
    //window->DrawList->AddRect(ImVec2(tab_bar->BarRect.Max.x - scrolling_buttons_width, tab_bar->BarRect.Min.y), ImVec2(tab_bar->BarRect.Max.x, tab_bar->BarRect.Max.y), IM_COL32(255,0,0,255));
    const ImRect avail_bar_rect = tab_bar->BarRect;
    bool want_clip_rect = !avail_bar_rect.Contains(ImRect(window->DC.CursorPos, window->DC.CursorPos + ImVec2(scrolling_buttons_width, 0.0f)));
    if (want_clip_rect)
        PushClipRect(tab_bar->BarRect.Min, tab_bar->BarRect.Max + ImVec2(g.Style.ItemInnerSpacing.x, 0.0f), true);
    ImGuiTabItem* tab_to_select = NULL;
    int select_dir = 0;
    ImVec4 arrow_col = g.Style.Colors[ImGuiCol_Text];
    arrow_col.w *= 0.5f;
    PushStyleColor(ImGuiCol_Text, arrow_col);
    PushStyleColor(ImGuiCol_Button, ImVec4(0, 0, 0, 0));
    const float backup_repeat_delay = g.IO.KeyRepeatDelay;
    const float backup_repeat_rate = g.IO.KeyRepeatRate;
    g.IO.KeyRepeatDelay = 0.250f;
    g.IO.KeyRepeatRate = 0.200f;
    window->DC.CursorPos = ImVec2(tab_bar->BarRect.Max.x - scrolling_buttons_width, tab_bar->BarRect.Min.y);
    if (ArrowButtonEx("##<", ImGuiDir_Left, arrow_button_size, ImGuiButtonFlags_PressedOnClick | ImGuiButtonFlags_Repeat))
        select_dir = -1;
    window->DC.CursorPos = ImVec2(tab_bar->BarRect.Max.x - scrolling_buttons_width + arrow_button_size.x, tab_bar->BarRect.Min.y);
    if (ArrowButtonEx("##>", ImGuiDir_Right, arrow_button_size, ImGuiButtonFlags_PressedOnClick | ImGuiButtonFlags_Repeat))
        select_dir = +1;
    PopStyleColor(2);
    g.IO.KeyRepeatRate = backup_repeat_rate;
    g.IO.KeyRepeatDelay = backup_repeat_delay;
    if (want_clip_rect)
        PopClipRect();
    if (select_dir != 0)
        if (ImGuiTabItem* tab_item = TabBarFindTabByID(tab_bar, tab_bar->SelectedTabId))
        {
            int selected_order = tab_bar->GetTabOrder(tab_item);
            int target_order = selected_order + select_dir;
            tab_to_select = &tab_bar->Tabs[(target_order >= 0 && target_order < tab_bar->Tabs.Size) ? target_order : selected_order]; // If we are at the end of the list, still scroll to make our tab visible
        }
    window->DC.CursorPos = backup_cursor_pos;
    tab_bar->BarRect.Max.x -= scrolling_buttons_width + 1.0f;
    return tab_to_select;
 }
 //-------------------------------------------------------------------------
 // [SECTION] Widgets: BeginTabItem, EndTabItem, etc.
 //-------------------------------------------------------------------------
 // [BETA API] API may evolve! This code has been extracted out of the Docking branch,
 // and some of the construct which are not used in Master may be left here to facilitate merging.
 //-------------------------------------------------------------------------
 // - BeginTabItem()
 // - EndTabItem()
 // - TabItemEx() [Internal]
 // - SetTabItemClosed()
 // - TabItemCalcSize() [Internal]
 // - TabItemRenderBackground() [Internal]
 // - TabItemLabelAndCloseButton() [Internal]
 //-------------------------------------------------------------------------
 bool    ImGui::BeginTabItem(const char* label, bool* p_open, ImGuiTabItemFlags flags)
 {
    ImGuiContext& g = *GImGui;
    if (g.CurrentWindow->SkipItems)
        return false;
    IM_ASSERT(g.CurrentTabBar.Size > 0 && "Needs to be called between BeginTabBar() and EndTabBar()!");
    ImGuiTabBar* tab_bar = g.CurrentTabBar.back();
    bool ret = TabItemEx(tab_bar, label, p_open, flags);
    if (ret && !(flags & ImGuiTabItemFlags_NoPushId))
        PushID(tab_bar->Tabs[tab_bar->LastTabItemIdx].ID);
    return ret;
 }
 void    ImGui::EndTabItem()
 {
    ImGuiContext& g = *GImGui;
    if (g.CurrentWindow->SkipItems)
        return;
    IM_ASSERT(g.CurrentTabBar.Size > 0 && "Needs to be called between BeginTabBar() and EndTabBar()!");
    ImGuiTabBar* tab_bar = g.CurrentTabBar.back();
    ImGuiTabItem* tab = &tab_bar->Tabs[tab_bar->LastTabItemIdx];
    if (!(tab->Flags & ImGuiTabItemFlags_NoPushId))
        PopID();
 }
 bool    ImGui::TabItemEx(ImGuiTabBar* tab_bar, const char* label, bool* p_open, ImGuiTabItemFlags flags)
 {
    // Layout whole tab bar if not already done
    if (tab_bar->WantLayout)
        TabBarLayout(tab_bar);
    ImGuiContext& g = *GImGui;
    ImGuiWindow* window = g.CurrentWindow;
    if (window->SkipItems)
        return false;
    const ImGuiStyle& style = g.Style;
    const ImGuiID id = TabBarCalcTabID(tab_bar, label);
    // If the user called us with *p_open == false, we early out and don't render. We make a dummy call to ItemAdd() so that attempts to use a contextual popup menu with an implicit ID won't use an older ID.
    if (p_open && !*p_open)
    {
        PushItemFlag(ImGuiItemFlags_NoNav | ImGuiItemFlags_NoNavDefaultFocus, true);
        ItemAdd(ImRect(), id);
        PopItemFlag();
        return false;
    }
    // Calculate tab contents size
    ImVec2 size = TabItemCalcSize(label, p_open != NULL);
    // Acquire tab data
    ImGuiTabItem* tab = TabBarFindTabByID(tab_bar, id);
    bool tab_is_new = false;
    if (tab == NULL)
    {
        tab_bar->Tabs.push_back(ImGuiTabItem());
        tab = &tab_bar->Tabs.back();
        tab->ID = id;
        tab->Width = size.x;
        tab_is_new = true;
    }
    tab_bar->LastTabItemIdx = (short)tab_bar->Tabs.index_from_pointer(tab);
    tab->WidthContents = size.x;
    const bool tab_bar_appearing = (tab_bar->PrevFrameVisible + 1 < g.FrameCount);
    const bool tab_bar_focused = (tab_bar->Flags & ImGuiTabBarFlags_IsFocused) != 0;
    const bool tab_appearing = (tab->LastFrameVisible + 1 < g.FrameCount);
    tab->LastFrameVisible = g.FrameCount;
    tab->Flags = flags;
    // If we are not reorderable, always reset offset based on submission order.
    // (We already handled layout and sizing using the previous known order, but sizing is not affected by order!)
    if (!tab_appearing && !(tab_bar->Flags & ImGuiTabBarFlags_Reorderable))
    {
        tab->Offset = tab_bar->OffsetNextTab;
        tab_bar->OffsetNextTab += tab->Width + g.Style.ItemInnerSpacing.x;
    }
    // Update selected tab
    if (tab_appearing && (tab_bar->Flags & ImGuiTabBarFlags_AutoSelectNewTabs) && tab_bar->NextSelectedTabId == 0)
        if (!tab_bar_appearing || tab_bar->SelectedTabId == 0)
            tab_bar->NextSelectedTabId = id;  // New tabs gets activated
    // Lock visibility
    bool tab_contents_visible = (tab_bar->VisibleTabId == id);
    if (tab_contents_visible)
        tab_bar->VisibleTabWasSubmitted = true;
    // On the very first frame of a tab bar we let first tab contents be visible to minimize appearing glitches
    if (!tab_contents_visible && tab_bar->SelectedTabId == 0 && tab_bar_appearing)
        if (tab_bar->Tabs.Size == 1 && !(tab_bar->Flags & ImGuiTabBarFlags_AutoSelectNewTabs))
            tab_contents_visible = true;
    if (tab_appearing && !(tab_bar_appearing && !tab_is_new))
    {
        PushItemFlag(ImGuiItemFlags_NoNav | ImGuiItemFlags_NoNavDefaultFocus, true);
        ItemAdd(ImRect(), id);
        PopItemFlag();
        return tab_contents_visible;
    }
    if (tab_bar->SelectedTabId == id)
        tab->LastFrameSelected = g.FrameCount;
    // Backup current layout position
    const ImVec2 backup_main_cursor_pos = window->DC.CursorPos;
    // Layout
    size.x = tab->Width;
    window->DC.CursorPos = tab_bar->BarRect.Min + ImVec2((float)(int)tab->Offset - tab_bar->ScrollingAnim, 0.0f);
    ImVec2 pos = window->DC.CursorPos;
    ImRect bb(pos, pos + size);
    // We don't have CPU clipping primitives to clip the CloseButton (until it becomes a texture), so need to add an extra draw call (temporary in the case of vertical animation)
    bool want_clip_rect = (bb.Min.x < tab_bar->BarRect.Min.x) || (bb.Max.x >= tab_bar->BarRect.Max.x);
    if (want_clip_rect)
        PushClipRect(ImVec2(ImMax(bb.Min.x, tab_bar->BarRect.Min.x), bb.Min.y - 1), ImVec2(tab_bar->BarRect.Max.x, bb.Max.y), true);
    ItemSize(bb, style.FramePadding.y);
    if (!ItemAdd(bb, id))
    {
        if (want_clip_rect)
            PopClipRect();
        window->DC.CursorPos = backup_main_cursor_pos;
        return tab_contents_visible;
    }
    // Click to Select a tab
    ImGuiButtonFlags button_flags = (ImGuiButtonFlags_PressedOnClick | ImGuiButtonFlags_AllowItemOverlap);
    bool hovered, held;
    bool pressed = ButtonBehavior(bb, id, &hovered, &held, button_flags);
    hovered |= (g.HoveredId == id);
    if (pressed || ((flags & ImGuiTabItemFlags_SetSelected) && !tab_contents_visible)) // SetSelected can only be passed on explicit tab bar
        tab_bar->NextSelectedTabId = id;
    // Allow the close button to overlap unless we are dragging (in which case we don't want any overlapping tabs to be hovered)
    if (!held)
        SetItemAllowOverlap();
    // Drag and drop: re-order tabs
    if (held && !tab_appearing && IsMouseDragging(0))
    {
        if (!g.DragDropActive && (tab_bar->Flags & ImGuiTabBarFlags_Reorderable))
        {
            // While moving a tab it will jump on the other side of the mouse, so we also test for MouseDelta.x
            if (g.IO.MouseDelta.x < 0.0f && g.IO.MousePos.x < bb.Min.x)
            {
                if (tab_bar->Flags & ImGuiTabBarFlags_Reorderable)
                    TabBarQueueChangeTabOrder(tab_bar, tab, -1);
            }
            else if (g.IO.MouseDelta.x > 0.0f && g.IO.MousePos.x > bb.Max.x)
            {
                if (tab_bar->Flags & ImGuiTabBarFlags_Reorderable)
                    TabBarQueueChangeTabOrder(tab_bar, tab, +1);
            }
        }
    }
 #if 0
    if (hovered && g.HoveredIdNotActiveTimer > 0.50f && bb.GetWidth() < tab->WidthContents)
    {
        // Enlarge tab display when hovering
        bb.Max.x = bb.Min.x + (float)(int)ImLerp(bb.GetWidth(), tab->WidthContents, ImSaturate((g.HoveredIdNotActiveTimer - 0.40f) * 6.0f));
        display_draw_list = GetOverlayDrawList(window);
        TabItemRenderBackground(display_draw_list, bb, flags, GetColorU32(ImGuiCol_TitleBgActive));
    }
 #endif
    // Render tab shape
    ImDrawList* display_draw_list = window->DrawList;
    const ImU32 tab_col = GetColorU32((held || hovered) ? ImGuiCol_TabHovered : tab_contents_visible ? (tab_bar_focused ? ImGuiCol_TabActive : ImGuiCol_TabUnfocusedActive) : (tab_bar_focused ? ImGuiCol_Tab : ImGuiCol_TabUnfocused));
    TabItemBackground(display_draw_list, bb, flags, tab_col);
    RenderNavHighlight(bb, id);
    // Select with right mouse button. This is so the common idiom for context menu automatically highlight the current widget.
    const bool hovered_unblocked = IsItemHovered(ImGuiHoveredFlags_AllowWhenBlockedByPopup);
    if (hovered_unblocked && (IsMouseClicked(1) || IsMouseReleased(1)))
        tab_bar->NextSelectedTabId = id;
    if (tab_bar->Flags & ImGuiTabBarFlags_NoCloseWithMiddleMouseButton)
        flags |= ImGuiTabItemFlags_NoCloseWithMiddleMouseButton;
    // Render tab label, process close button
    const ImGuiID close_button_id = p_open ? window->GetID((void*)(intptr_t)(id + 1)) : 0;
    bool just_closed = TabItemLabelAndCloseButton(display_draw_list, bb, flags, label, id, close_button_id);
    if (just_closed)
    {
        *p_open = false;
        TabBarCloseTab(tab_bar, tab);
    }
    // Restore main window position so user can draw there
    if (want_clip_rect)
        PopClipRect();
    window->DC.CursorPos = backup_main_cursor_pos;
    // Tooltip (FIXME: Won't work over the close button because ItemOverlap systems messes up with HoveredIdTimer)
    if (g.HoveredId == id && !held && g.HoveredIdNotActiveTimer > 0.50f)
        SetTooltip("%.*s", (int)(FindRenderedTextEnd(label) - label), label);
    return tab_contents_visible;
 }
 // [Public] This is call is 100% optional but it allows to remove some one-frame glitches when a tab has been unexpectedly removed.
 // To use it to need to call the function SetTabItemClosed() after BeginTabBar() and before any call to BeginTabItem()
 void    ImGui::SetTabItemClosed(const char* label)
 {
    ImGuiContext& g = *GImGui;
    bool is_within_manual_tab_bar = (g.CurrentTabBar.Size > 0) && !(g.CurrentTabBar.back()->Flags & ImGuiTabBarFlags_DockNode);
    if (is_within_manual_tab_bar)
    {
        ImGuiTabBar* tab_bar = g.CurrentTabBar.back();
        IM_ASSERT(tab_bar->WantLayout);         // Needs to be called AFTER BeginTabBar() and BEFORE the first call to BeginTabItem()
        ImGuiID tab_id = TabBarCalcTabID(tab_bar, label);
        TabBarRemoveTab(tab_bar, tab_id);
    }
 }
 ImVec2 ImGui::TabItemCalcSize(const char* label, bool has_close_button)
 {
    ImGuiContext& g = *GImGui;
    ImVec2 label_size = CalcTextSize(label, NULL, true);
    ImVec2 size = ImVec2(label_size.x + g.Style.FramePadding.x, label_size.y + g.Style.FramePadding.y * 2.0f);
    if (has_close_button)
        size.x += g.Style.FramePadding.x + (g.Style.ItemInnerSpacing.x + g.FontSize); // We use Y intentionally to fit the close button circle.
    else
        size.x += g.Style.FramePadding.x + 1.0f;
    return ImVec2(ImMin(size.x, TabBarCalcMaxTabWidth()), size.y);
 }
 void ImGui::TabItemBackground(ImDrawList* draw_list, const ImRect& bb, ImGuiTabItemFlags flags, ImU32 col)
 {
    // While rendering tabs, we trim 1 pixel off the top of our bounding box so they can fit within a regular frame height while looking "detached" from it.
    (void)flags;
    ImGuiContext& g = *GImGui;
    const float width = bb.GetWidth();
    IM_ASSERT(width > 0.0f);
    const float rounding = ImMax(0.0f, ImMin(g.Style.TabRounding, width * 0.5f - 1.0f));
    float y1 = bb.Min.y + 1.0f;
    float y2 = bb.Max.y - 1.0f;
    draw_list->PathLineTo(ImVec2(bb.Min.x, y2));
    draw_list->PathArcToFast(ImVec2(bb.Min.x + rounding, y1 + rounding), rounding, 6, 9);
    draw_list->PathArcToFast(ImVec2(bb.Max.x - rounding, y1 + rounding), rounding, 9, 12);
    draw_list->PathLineTo(ImVec2(bb.Max.x, y2));
    draw_list->AddConvexPolyFilled(draw_list->_Path.Data, draw_list->_Path.Size, col);
    if (g.Style.TabBorderSize > 0.0f)
        draw_list->AddPolyline(draw_list->_Path.Data, draw_list->_Path.Size, GetColorU32(ImGuiCol_Border), false, g.Style.TabBorderSize);
    draw_list->PathClear();
 }
 // Render text label (with custom clipping) + Unsaved Document marker + Close Button logic
 bool ImGui::TabItemLabelAndCloseButton(ImDrawList* draw_list, const ImRect& bb, ImGuiTabItemFlags flags, const char* label, ImGuiID tab_id, ImGuiID close_button_id)
 {
    ImGuiContext& g = *GImGui;
    ImGuiStyle& style = g.Style;
    ImVec2 label_size = CalcTextSize(label, NULL, true);
    if (bb.GetWidth() <= 1.0f)
        return false;
    // Render text label (with clipping + alpha gradient) + unsaved marker
    const char* TAB_UNSAVED_MARKER = "*";
    ImRect text_pixel_clip_bb(bb.Min.x + style.FramePadding.x, bb.Min.y + style.FramePadding.y, bb.Max.x - style.FramePadding.x, bb.Max.y);
    if (flags & ImGuiTabItemFlags_UnsavedDocument)
    {
        text_pixel_clip_bb.Max.x -= CalcTextSize(TAB_UNSAVED_MARKER, NULL, false).x;
        ImVec2 unsaved_marker_pos(ImMin(bb.Min.x + style.FramePadding.x + label_size.x + 2, text_pixel_clip_bb.Max.x), bb.Min.y + style.FramePadding.y + (float)(int)(-g.FontSize * 0.25f));
        RenderTextClippedEx(draw_list, unsaved_marker_pos, bb.Max - style.FramePadding, TAB_UNSAVED_MARKER, NULL, NULL);
    }
    ImRect text_ellipsis_clip_bb = text_pixel_clip_bb;
    // Close Button
    // We are relying on a subtle and confusing distinction between 'hovered' and 'g.HoveredId' which happens because we are using ImGuiButtonFlags_AllowOverlapMode + SetItemAllowOverlap()
    //  'hovered' will be true when hovering the Tab but NOT when hovering the close button
    //  'g.HoveredId==id' will be true when hovering the Tab including when hovering the close button
    //  'g.ActiveId==close_button_id' will be true when we are holding on the close button, in which case both hovered booleans are false
    bool close_button_pressed = false;
    bool close_button_visible = false;
    if (close_button_id != 0)
        if (g.HoveredId == tab_id || g.HoveredId == close_button_id || g.ActiveId == close_button_id)
            close_button_visible = true;
    if (close_button_visible)
    {
        ImGuiItemHoveredDataBackup last_item_backup;
        const float close_button_sz = g.FontSize * 0.5f;
        if (CloseButton(close_button_id, ImVec2(bb.Max.x - style.FramePadding.x - close_button_sz, bb.Min.y + style.FramePadding.y + close_button_sz), close_button_sz))
            close_button_pressed = true;
        last_item_backup.Restore();
        // Close with middle mouse button
        if (!(flags & ImGuiTabItemFlags_NoCloseWithMiddleMouseButton) && IsMouseClicked(2))
            close_button_pressed = true;
        text_pixel_clip_bb.Max.x -= close_button_sz * 2.0f;
    }
    // Label with ellipsis
    // FIXME: This should be extracted into a helper but the use of text_pixel_clip_bb and !close_button_visible makes it tricky to abstract at the moment
    const char* label_display_end = FindRenderedTextEnd(label);
    if (label_size.x > text_ellipsis_clip_bb.GetWidth())
    {
        const int ellipsis_dot_count = 3;
        const float ellipsis_width = (1.0f + 1.0f) * ellipsis_dot_count - 1.0f;
        const char* label_end = NULL;
        float label_size_clipped_x = g.Font->CalcTextSizeA(g.FontSize, text_ellipsis_clip_bb.GetWidth() - ellipsis_width + 1.0f, 0.0f, label, label_display_end, &label_end).x;
        if (label_end == label && label_end < label_display_end)    // Always display at least 1 character if there's no room for character + ellipsis
        {
            label_end = label + ImTextCountUtf8BytesFromChar(label, label_display_end);
            label_size_clipped_x = g.Font->CalcTextSizeA(g.FontSize, FLT_MAX, 0.0f, label, label_end).x;
        }
        while (label_end > label && ImCharIsBlankA(label_end[-1])) // Trim trailing space
        {
            label_end--;
            label_size_clipped_x -= g.Font->CalcTextSizeA(g.FontSize, FLT_MAX, 0.0f, label_end, label_end + 1).x; // Ascii blanks are always 1 byte
        }
        RenderTextClippedEx(draw_list, text_pixel_clip_bb.Min, text_pixel_clip_bb.Max, label, label_end, &label_size, ImVec2(0.0f, 0.0f));
        const float ellipsis_x = text_pixel_clip_bb.Min.x + label_size_clipped_x + 1.0f;
        if (!close_button_visible && ellipsis_x + ellipsis_width <= bb.Max.x)
            RenderPixelEllipsis(draw_list, g.Font, ImVec2(ellipsis_x, text_pixel_clip_bb.Min.y), ellipsis_dot_count, GetColorU32(ImGuiCol_Text));
    }
    else
    {
        RenderTextClippedEx(draw_list, text_pixel_clip_bb.Min, text_pixel_clip_bb.Max, label, label_display_end, &label_size, ImVec2(0.0f, 0.0f));
    }
    return close_button_pressed;
 }