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Merge branch 'drag_and_drop'

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This commit is contained in:
omar 2017-12-12 20:39:52 +01:00
commit d0a1be0de0
5 changed files with 418 additions and 6 deletions
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316
imgui.cpp
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@ -673,6 +673,7 @@ static bool DataTypeApplyOpFromText(const char* buf, const char* ini
namespace ImGui
{
static void ClearDragDrop();
static void FocusPreviousWindow();
}
@ -1901,6 +1902,16 @@ ImGuiID ImGuiWindow::GetIDNoKeepAlive(const char* str, const char* str_end)
return ImHash(str, str_end ? (int)(str_end - str) : 0, seed);
}
// This is only used in rare/specific situations to manufacture an ID out of nowhere.
ImGuiID ImGuiWindow::GetIDFromRectangle(const ImRect& r_abs)
{
ImGuiID seed = IDStack.back();
const int r_rel[4] = { (int)(r_abs.Min.x - Pos.x), (int)(r_abs.Min.y - Pos.y), (int)(r_abs.Max.x - Pos.x), (int)(r_abs.Max.y - Pos.y) };
ImGuiID id = ImHash(&r_rel, sizeof(r_rel), seed);
ImGui::KeepAliveID(id);
return id;
}
//-----------------------------------------------------------------------------
// Internal API exposed in imgui_internal.h
//-----------------------------------------------------------------------------
@ -2293,6 +2304,17 @@ void ImGui::NewFrame()
if (g.ScalarAsInputTextId && g.ActiveId != g.ScalarAsInputTextId)
g.ScalarAsInputTextId = 0;
// Elapse drag & drop payload
if (g.DragDropActive && g.DragDropPayload.DataFrameCount + 1 < g.FrameCount)
{
ClearDragDrop();
g.DragDropPayloadBufHeap.clear();
memset(&g.DragDropPayloadBufLocal, 0, sizeof(g.DragDropPayloadBufLocal));
}
g.DragDropAcceptIdPrev = g.DragDropAcceptIdCurr;
g.DragDropAcceptIdCurr = 0;
g.DragDropAcceptIdCurrRectSurface = FLT_MAX;
// Update keyboard input state
memcpy(g.IO.KeysDownDurationPrev, g.IO.KeysDownDuration, sizeof(g.IO.KeysDownDuration));
for (int i = 0; i < IM_ARRAYSIZE(g.IO.KeysDown); i++)
@ -5433,6 +5455,7 @@ const char* ImGui::GetStyleColorName(ImGuiCol idx)
case ImGuiCol_PlotHistogramHovered: return "PlotHistogramHovered";
case ImGuiCol_TextSelectedBg: return "TextSelectedBg";
case ImGuiCol_ModalWindowDarkening: return "ModalWindowDarkening";
case ImGuiCol_DragDropTarget: return "DragDropTarget";
}
IM_ASSERT(0);
return "Unknown";
@ -6178,6 +6201,19 @@ bool ImGui::ButtonBehavior(const ImRect& bb, ImGuiID id, bool* out_hovered, bool
bool pressed = false;
bool hovered = ItemHoverable(bb, id);
// Special mode for Drag and Drop where holding button pressed for a long time while dragging another item triggers the button
if ((flags & ImGuiButtonFlags_PressedOnDragDropHold) && g.DragDropActive && !(g.DragDropSourceFlags & ImGuiDragDropFlags_SourceNoHoldToOpenOthers))
if (IsItemHovered(ImGuiHoveredFlags_AllowWhenBlockedByActiveItem))
{
hovered = true;
SetHoveredID(id);
if (CalcTypematicPressedRepeatAmount(g.HoveredIdTimer + 0.0001f, g.HoveredIdTimer + 0.0001f - g.IO.DeltaTime, 0.01f, 0.70f)) // FIXME: Our formula for CalcTypematicPressedRepeatAmount() is fishy
{
pressed = true;
FocusWindow(window);
}
}
if ((flags & ImGuiButtonFlags_FlattenChildren) && g.HoveredRootWindow == window)
g.HoveredWindow = backup_hovered_window;
@ -6239,7 +6275,8 @@ bool ImGui::ButtonBehavior(const ImRect& bb, ImGuiID id, bool* out_hovered, bool
{
if (hovered && (flags & ImGuiButtonFlags_PressedOnClickRelease))
if (!((flags & ImGuiButtonFlags_Repeat) && g.IO.MouseDownDurationPrev[0] >= g.IO.KeyRepeatDelay)) // Repeat mode trumps <on release>
pressed = true;
if (!g.DragDropActive)
pressed = true;
ClearActiveID();
}
}
@ -6639,6 +6676,7 @@ bool ImGui::TreeNodeBehavior(ImGuiID id, ImGuiTreeNodeFlags flags, const char* l
// - OpenOnArrow .................... single-click on arrow to open
// - OpenOnDoubleClick|OpenOnArrow .. single-click on arrow or double-click anywhere to open
ImGuiButtonFlags button_flags = ImGuiButtonFlags_NoKeyModifiers | ((flags & ImGuiTreeNodeFlags_AllowItemOverlap) ? ImGuiButtonFlags_AllowItemOverlap : 0);
button_flags |= ImGuiButtonFlags_PressedOnDragDropHold;
if (flags & ImGuiTreeNodeFlags_OpenOnDoubleClick)
button_flags |= ImGuiButtonFlags_PressedOnDoubleClick | ((flags & ImGuiTreeNodeFlags_OpenOnArrow) ? ImGuiButtonFlags_PressedOnClickRelease : 0);
bool hovered, held, pressed = ButtonBehavior(interact_bb, id, &hovered, &held, button_flags);
@ -6649,6 +6687,8 @@ bool ImGui::TreeNodeBehavior(ImGuiID id, ImGuiTreeNodeFlags flags, const char* l
toggled |= IsMouseHoveringRect(interact_bb.Min, ImVec2(interact_bb.Min.x + text_offset_x, interact_bb.Max.y));
if (flags & ImGuiTreeNodeFlags_OpenOnDoubleClick)
toggled |= g.IO.MouseDoubleClicked[0];
if (g.DragDropActive && is_open) // When using Drag and Drop "hold to open" we keep the node highlighted after opening, but never close it again.
toggled = false;
if (toggled)
{
is_open = !is_open;
@ -9848,7 +9888,22 @@ bool ImGui::ColorButton(const char* desc_id, const ImVec4& col, ImGuiColorEditFl
else
window->DrawList->AddRect(bb.Min, bb.Max, GetColorU32(ImGuiCol_FrameBg), rounding); // Color button are often in need of some sort of border
if (hovered && !(flags & ImGuiColorEditFlags_NoTooltip))
// Drag and Drop Source
if (g.ActiveId == id && BeginDragDropSource()) // NB: The ActiveId test is merely an optional micro-optimization
{
if (flags & ImGuiColorEditFlags_NoAlpha)
SetDragDropPayload(IMGUI_PAYLOAD_TYPE_COLOR_3F, &col, sizeof(float) * 3, ImGuiCond_Once);
else
SetDragDropPayload(IMGUI_PAYLOAD_TYPE_COLOR_4F, &col, sizeof(float) * 4, ImGuiCond_Once);
ColorButton(desc_id, col, flags);
SameLine();
TextUnformatted("Color");
EndDragDropSource();
hovered = false;
}
// Tooltip
if (!(flags & ImGuiColorEditFlags_NoTooltip) && hovered)
ColorTooltip(desc_id, &col.x, flags & (ImGuiColorEditFlags_NoAlpha | ImGuiColorEditFlags_AlphaPreview | ImGuiColorEditFlags_AlphaPreviewHalf));
return pressed;
@ -10124,6 +10179,22 @@ bool ImGui::ColorEdit4(const char* label, float col[4], ImGuiColorEditFlags flag
PopID();
EndGroup();
// Drag and Drop Target
if (window->DC.LastItemRectHoveredRect && BeginDragDropTarget()) // NB: The LastItemRectHoveredRect test is merely an optional micro-optimization
{
if (const ImGuiPayload* payload = AcceptDragDropPayload(IMGUI_PAYLOAD_TYPE_COLOR_3F))
{
memcpy((float*)col, payload->Data, sizeof(float) * 3);
value_changed = true;
}
if (const ImGuiPayload* payload = AcceptDragDropPayload(IMGUI_PAYLOAD_TYPE_COLOR_4F))
{
memcpy((float*)col, payload->Data, sizeof(float) * components);
value_changed = true;
}
EndDragDropTarget();
}
// When picker is being actively used, use its active id so IsItemActive() will function on ColorEdit4().
if (picker_active_window && g.ActiveId != 0 && g.ActiveIdWindow == picker_active_window)
window->DC.LastItemId = g.ActiveId;
@ -11065,6 +11136,247 @@ void ImGui::Value(const char* prefix, float v, const char* float_format)
}
}
//-----------------------------------------------------------------------------
// DRAG AND DROP
//-----------------------------------------------------------------------------
static void ImGui::ClearDragDrop()
{
ImGuiContext& g = *GImGui;
g.DragDropActive = false;
g.DragDropPayload.Clear();
g.DragDropAcceptIdCurr = g.DragDropAcceptIdPrev = 0;
g.DragDropAcceptIdCurrRectSurface = FLT_MAX;
g.DragDropAcceptFrameCount = -1;
}
// Call when current ID is active.
// When this returns true you need to: a) call SetDragDropPayload() exactly once, b) you may render the payload visual/description, c) call EndDragDropSource()
bool ImGui::BeginDragDropSource(ImGuiDragDropFlags flags, int mouse_button)
{
ImGuiContext& g = *GImGui;
ImGuiWindow* window = g.CurrentWindow;
if (g.IO.MouseDown[mouse_button] == false)
return false;
ImGuiID id = window->DC.LastItemId;
if (id == 0)
{
// If you want to use BeginDragDropSource() on an item with no unique identifier for interaction, such as Text() or Image(), you need to:
// A) Read the explanation below, B) Use the ImGuiDragDropFlags_SourceAllowNullID flag, C) Swallow your programmer pride.
if (!(flags & ImGuiDragDropFlags_SourceAllowNullID))
{
IM_ASSERT(0);
return false;
}
// Magic fallback (=somehow reprehensible) to handle items with no assigned ID, e.g. Text(), Image()
// We build a throwaway ID based on current ID stack + relative AABB of items in window.
// THE IDENTIFIER WON'T SURVIVE ANY REPOSITIONING OF THE WIDGET, so if your widget moves your dragging operation will be canceled.
// We don't need to maintain/call ClearActiveID() as releasing the button will early out this function and trigger !ActiveIdIsAlive.
bool is_hovered = window->DC.LastItemRectHoveredRect;
if (!is_hovered && (g.ActiveId == 0 || g.ActiveIdWindow != window))
return false;
id = window->DC.LastItemId = window->GetIDFromRectangle(window->DC.LastItemRect);
if (is_hovered)
SetHoveredID(id);
if (is_hovered && g.IO.MouseClicked[mouse_button])
{
SetActiveID(id, window);
FocusWindow(window);
}
if (g.ActiveId == id) // Allow the underlying widget to display/return hovered during the mouse release frame, else we would get a flicker.
g.ActiveIdAllowOverlap = is_hovered;
}
if (g.ActiveId != id)
return false;
if (IsMouseDragging(mouse_button))
{
if (!g.DragDropActive)
{
IM_ASSERT(id != 0);
ClearDragDrop();
ImGuiPayload& payload = g.DragDropPayload;
payload.SourceId = id;
payload.SourceParentId = window->IDStack.back();
g.DragDropActive = true;
g.DragDropSourceFlags = flags;
g.DragDropMouseButton = mouse_button;
}
if (!(flags & ImGuiDragDropFlags_SourceNoAutoTooltip))
{
// FIXME-DRAG
//SetNextWindowPos(g.IO.MousePos - g.ActiveIdClickOffset - g.Style.WindowPadding);
//PushStyleVar(ImGuiStyleVar_Alpha, g.Style.Alpha * 0.60f); // This is better but e.g ColorButton with checkboard has issue with transparent colors :(
SetNextWindowPos(g.IO.MousePos);
PushStyleColor(ImGuiCol_PopupBg, GetStyleColorVec4(ImGuiCol_PopupBg) * ImVec4(1.0f, 1.0f, 1.0f, 0.6f));
BeginTooltipEx(ImGuiWindowFlags_NoInputs);
}
if (!(flags & ImGuiDragDropFlags_SourceNoDisableHover))
window->DC.LastItemRectHoveredRect = false;
return true;
}
return false;
}
void ImGui::EndDragDropSource()
{
ImGuiContext& g = *GImGui;
IM_ASSERT(g.DragDropActive);
if (!(g.DragDropSourceFlags & ImGuiDragDropFlags_SourceNoAutoTooltip))
{
EndTooltip();
PopStyleColor();
//PopStyleVar();
}
// Discard the drag if have not called SetDragDropPayload()
if (g.DragDropPayload.DataFrameCount == -1)
ClearDragDrop();
}
// Use 'cond' to choose to submit payload on drag start or every frame
bool ImGui::SetDragDropPayload(const char* type, const void* data, size_t data_size, ImGuiCond cond)
{
ImGuiContext& g = *GImGui;
ImGuiPayload& payload = g.DragDropPayload;
if (cond == 0)
cond = ImGuiCond_Always;
IM_ASSERT(type != NULL);
IM_ASSERT(strlen(type) < IM_ARRAYSIZE(payload.DataType)); // Payload type can be at most 8 characters longs
IM_ASSERT((data != NULL && data_size > 0) || (data == NULL && data_size == 0));
IM_ASSERT(cond == ImGuiCond_Always || cond == ImGuiCond_Once);
IM_ASSERT(payload.SourceId != 0); // Not called between BeginDragDropSource() and EndDragDropSource()
if (cond == ImGuiCond_Always || payload.DataFrameCount == -1)
{
// Copy payload
ImStrncpy(payload.DataType, type, IM_ARRAYSIZE(payload.DataType));
g.DragDropPayloadBufHeap.resize(0);
if (data_size > sizeof(g.DragDropPayloadBufLocal))
{
// Store in heap
g.DragDropPayloadBufHeap.resize((int)data_size);
payload.Data = g.DragDropPayloadBufHeap.Data;
memcpy((void*)payload.Data, data, data_size);
}
else if (data_size > 0)
{
// Store locally
memset(&g.DragDropPayloadBufLocal, 0, sizeof(g.DragDropPayloadBufLocal));
payload.Data = g.DragDropPayloadBufLocal;
memcpy((void*)payload.Data, data, data_size);
}
else
{
payload.Data = NULL;
}
payload.DataSize = (int)data_size;
}
payload.DataFrameCount = g.FrameCount;
return (g.DragDropAcceptFrameCount == g.FrameCount) || (g.DragDropAcceptFrameCount == g.FrameCount - 1);
}
bool ImGui::BeginDragDropTargetCustom(const ImRect& bb, ImGuiID id)
{
ImGuiContext& g = *GImGui;
if (!g.DragDropActive)
return false;
ImGuiWindow* window = g.CurrentWindow;
if (g.HoveredWindow == NULL || window->RootWindow != g.HoveredWindow->RootWindow)
return false;
IM_ASSERT(id != 0);
if (!IsMouseHoveringRect(bb.Min, bb.Max) || (id == g.DragDropPayload.SourceId))
return false;
g.DragDropTargetRect = bb;
g.DragDropTargetId = id;
return true;
}
// We don't use BeginDragDropTargetCustom() and duplicate its code because:
// 1) we use LastItemRectHoveredRect which handles items that pushes a temporarily clip rectangle in their code. Calling BeginDragDropTargetCustom(LastItemRect) would not handle them.
// 2) and it's faster. as this code may be very frequently called, we want to early out as fast as we can.
// Also note how the HoveredWindow test is positioned differently in both functions (in both functions we optimize for the cheapest early out case)
bool ImGui::BeginDragDropTarget()
{
ImGuiContext& g = *GImGui;
if (!g.DragDropActive)
return false;
ImGuiWindow* window = g.CurrentWindow;
if (!window->DC.LastItemRectHoveredRect)
return false;
if (g.HoveredWindow == NULL || window->RootWindow != g.HoveredWindow->RootWindow)
return false;
ImGuiID id = window->DC.LastItemId;
if (id == 0)
id = window->GetIDFromRectangle(window->DC.LastItemRect);
if (g.DragDropPayload.SourceId == id)
return false;
g.DragDropTargetRect = window->DC.LastItemRect;
g.DragDropTargetId = id;
return true;
}
const ImGuiPayload* ImGui::AcceptDragDropPayload(const char* type, ImGuiDragDropFlags flags)
{
ImGuiContext& g = *GImGui;
ImGuiWindow* window = g.CurrentWindow;
ImGuiPayload& payload = g.DragDropPayload;
IM_ASSERT(g.DragDropActive); // Not called between BeginDragDropTarget() and EndDragDropTarget() ?
IM_ASSERT(payload.DataFrameCount != -1); // Forgot to call EndDragDropTarget() ?
if (type != NULL && !payload.IsDataType(type))
return NULL;
// Accept smallest drag target bounding box, this allows us to nest drag targets conveniently without ordering constraints.
// NB: We currently accept NULL id as target. However, overlapping targets requires a unique ID to function!
const bool was_accepted_previously = (g.DragDropAcceptIdPrev == g.DragDropTargetId);
ImRect r = g.DragDropTargetRect;
float r_surface = r.GetWidth() * r.GetHeight();
if (r_surface < g.DragDropAcceptIdCurrRectSurface)
{
g.DragDropAcceptIdCurr = g.DragDropTargetId;
g.DragDropAcceptIdCurrRectSurface = r_surface;
}
// Render default drop visuals
payload.Preview = was_accepted_previously;
if (!(flags & ImGuiDragDropFlags_AcceptNoDrawDefaultRect) && payload.Preview)
{
// FIXME-DRAG: Settle on a proper default visuals for drop target.
r.Expand(3.5f);
bool push_clip_rect = !window->ClipRect.Contains(r);
if (push_clip_rect) window->DrawList->PushClipRectFullScreen();
window->DrawList->AddRect(r.Min, r.Max, GetColorU32(ImGuiCol_DragDropTarget), 0.0f, ~0, 2.0f);
if (push_clip_rect) window->DrawList->PopClipRect();
}
g.DragDropAcceptFrameCount = g.FrameCount;
payload.Delivery = was_accepted_previously && IsMouseReleased(g.DragDropMouseButton);
if (!payload.Delivery && !(flags & ImGuiDragDropFlags_AcceptBeforeDelivery))
return NULL;
return &payload;
}
// We don't really use/need this now, but added it for the sake of consistency and because we might need it later.
void ImGui::EndDragDropTarget()
{
ImGuiContext& g = *GImGui;
IM_ASSERT(g.DragDropActive);
}
//-----------------------------------------------------------------------------
// PLATFORM DEPENDENT HELPERS
//-----------------------------------------------------------------------------

52
imgui.h
View File

@ -64,6 +64,7 @@ struct ImGuiTextBuffer; // Text buffer for logging/accumulating text
struct ImGuiTextEditCallbackData; // Shared state of ImGui::InputText() when using custom ImGuiTextEditCallback (rare/advanced use)
struct ImGuiSizeConstraintCallbackData;// Structure used to constraint window size in custom ways when using custom ImGuiSizeConstraintCallback (rare/advanced use)
struct ImGuiListClipper; // Helper to manually clip large list of items
struct ImGuiPayload; // User data payload for drag and drop operations
struct ImGuiContext; // ImGui context (opaque)
// Typedefs and Enumerations (declared as int for compatibility and to not pollute the top of this file)
@ -78,6 +79,7 @@ typedef int ImGuiMouseCursor; // enum: a mouse cursor identifier
typedef int ImGuiStyleVar; // enum: a variable identifier for styling // enum ImGuiStyleVar_
typedef int ImDrawCornerFlags; // flags: for ImDrawList::AddRect*() etc. // enum ImDrawCornerFlags_
typedef int ImGuiColorEditFlags; // flags: for ColorEdit*(), ColorPicker*() // enum ImGuiColorEditFlags_
typedef int ImGuiDragDropFlags; // flags: for *DragDrop*() // enum ImGuiDragDropFlags_
typedef int ImGuiColumnsFlags; // flags: for *Columns*() // enum ImGuiColumnsFlags_
typedef int ImGuiComboFlags; // flags: for BeginCombo() // enum ImGuiComboFlags_
typedef int ImGuiFocusedFlags; // flags: for IsWindowFocused() // enum ImGuiFocusedFlags_
@ -418,6 +420,15 @@ namespace ImGui
IMGUI_API void LogButtons(); // helper to display buttons for logging to tty/file/clipboard
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.
IMGUI_API bool BeginDragDropSource(ImGuiDragDropFlags flags = 0, int mouse_button = 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 data_size, ImGuiCond cond = 0); // Type is a user defined string of maximum 8 characters. Strings starting with '_' are reserved for dear imgui internal types. Data is copied and held by imgui.
IMGUI_API void EndDragDropSource();
IMGUI_API bool BeginDragDropTarget(); // Call after submitting an item that may receive an item. If this returns true, you can call AcceptDragDropPayload() + EndDragDropTarget()
IMGUI_API const ImGuiPayload* AcceptDragDropPayload(const char* type, ImGuiDragDropFlags flags = 0); // Accept contents of a given type. If ImGuiDragDropFlags_AcceptBeforeDelivery is set you can peek into the payload before the mouse button is released.
IMGUI_API void EndDragDropTarget();
// Clipping
IMGUI_API void PushClipRect(const ImVec2& clip_rect_min, const ImVec2& clip_rect_max, bool intersect_with_current_clip_rect);
IMGUI_API void PopClipRect();
@ -620,6 +631,24 @@ enum ImGuiHoveredFlags_
ImGuiHoveredFlags_RectOnly = ImGuiHoveredFlags_AllowWhenBlockedByPopup | ImGuiHoveredFlags_AllowWhenBlockedByActiveItem | ImGuiHoveredFlags_AllowWhenOverlapped
};
// Flags for ImGui::BeginDragDropSource(), ImGui::AcceptDragDropPayload()
enum ImGuiDragDropFlags_
{
// BeginDragDropSource() flags
ImGuiDragDropFlags_SourceNoAutoTooltip = 1 << 0, // By default, a successful call to BeginDragDropSource opens a tooltip so you can display a preview or description of the dragged contents. This flag disable this behavior.
ImGuiDragDropFlags_SourceNoDisableHover = 1 << 1, // By default, when dragging we clear data so that IsItemHovered() will return true, to avoid subsequent user code submitting tooltips. This flag disable this behavior so you can still call IsItemHovered() on the source item.
ImGuiDragDropFlags_SourceNoHoldToOpenOthers = 1 << 2, // Disable the behavior that allows to open tree nodes and collapsing header by holding over them while dragging a source item.
ImGuiDragDropFlags_SourceAllowNullID = 1 << 3, // Allow items such as Text(), Image() that have no unique identifier to be used as drag source, by manufacturing a temporary identifier based on their window-relative position. This is extremely unusual within the dear imgui ecosystem and so we made it explicit.
// AcceptDragDropPayload() flags
ImGuiDragDropFlags_AcceptBeforeDelivery = 1 << 10, // AcceptDragDropPayload() will returns true even before the mouse button is released. You can then call IsDelivery() to test if the payload needs to be delivered.
ImGuiDragDropFlags_AcceptNoDrawDefaultRect = 1 << 11, // Do not draw the default highlight rectangle when hovering over target.
ImGuiDragDropFlags_AcceptPeekOnly = ImGuiDragDropFlags_AcceptBeforeDelivery | ImGuiDragDropFlags_AcceptNoDrawDefaultRect // For peeking ahead and inspecting the payload before delivery.
};
// Standard Drag and Drop payload types. Types starting with '_' are defined by Dear ImGui.
#define IMGUI_PAYLOAD_TYPE_COLOR_3F "_COL3F" // float[3] // Standard type for colors, without alpha. User code may use this type.
#define IMGUI_PAYLOAD_TYPE_COLOR_4F "_COL4F" // float[4] // Standard type for colors. User code may use this type.
// User fill ImGuiIO.KeyMap[] array with indices into the ImGuiIO.KeysDown[512] array
enum ImGuiKey_
{
@ -690,6 +719,7 @@ enum ImGuiCol_
ImGuiCol_PlotHistogramHovered,
ImGuiCol_TextSelectedBg,
ImGuiCol_ModalWindowDarkening, // darken entire screen when a modal window is active
ImGuiCol_DragDropTarget,
ImGuiCol_COUNT
// Obsolete names (will be removed)
@ -1176,6 +1206,28 @@ struct ImGuiSizeConstraintCallbackData
ImVec2 DesiredSize; // Read-write. Desired size, based on user's mouse position. Write to this field to restrain resizing.
};
// Data payload for Drag and Drop operations
struct ImGuiPayload
{
// Members
const void* Data; // Data (copied and owned by dear imgui)
int DataSize; // Data size
// [Internal]
ImGuiID SourceId; // Source item id
ImGuiID SourceParentId; // Source parent id (if available)
int DataFrameCount; // Data timestamp
char DataType[8 + 1]; // Data type tag (short user-supplied string)
bool Preview; // Set when AcceptDragDropPayload() was called and mouse has been hovering the target item (nb: handle overlapping drag targets)
bool Delivery; // Set when AcceptDragDropPayload() was called and mouse button is released over the target item.
ImGuiPayload() { Clear(); }
void Clear() { SourceId = SourceParentId = 0; Data = NULL; DataSize = 0; memset(DataType, 0, sizeof(DataType)); DataFrameCount = -1; Preview = Delivery = false; }
bool IsDataType(const char* type) const { return DataFrameCount != -1 && strcmp(type, DataType) == 0; }
bool IsPreview() const { return Preview; }
bool IsDelivery() const { return Delivery; }
};
// Helpers macros to generate 32-bits encoded colors
#ifdef IMGUI_USE_BGRA_PACKED_COLOR
#define IM_COL32_R_SHIFT 16

21
imgui_demo.cpp
View File

@ -779,12 +779,19 @@ void ImGui::ShowTestWindow(bool* p_open)
ImGui::ColorEdit4("MyColor##3", (float*)&color, ImGuiColorEditFlags_NoInputs | ImGuiColorEditFlags_NoLabel | misc_flags);
ImGui::Text("Color button with Custom Picker Popup:");
// Generate a dummy palette
static bool saved_palette_inited = false;
static ImVec4 saved_palette[32];
static ImVec4 backup_color;
if (!saved_palette_inited)
for (int n = 0; n < IM_ARRAYSIZE(saved_palette); n++)
{
ImGui::ColorConvertHSVtoRGB(n / 31.0f, 0.8f, 0.8f, saved_palette[n].x, saved_palette[n].y, saved_palette[n].z);
saved_palette[n].w = 1.0f; // Alpha
}
saved_palette_inited = true;
static ImVec4 backup_color;
bool open_popup = ImGui::ColorButton("MyColor##3b", color, misc_flags);
ImGui::SameLine();
open_popup |= ImGui::Button("Palette");
@ -813,8 +820,18 @@ void ImGui::ShowTestWindow(bool* p_open)
ImGui::PushID(n);
if ((n % 8) != 0)
ImGui::SameLine(0.0f, ImGui::GetStyle().ItemSpacing.y);
if (ImGui::ColorButton("##palette", saved_palette[n], ImGuiColorEditFlags_NoPicker | ImGuiColorEditFlags_NoTooltip, ImVec2(20,20)))
if (ImGui::ColorButton("##palette", saved_palette[n], ImGuiColorEditFlags_NoAlpha | ImGuiColorEditFlags_NoPicker | ImGuiColorEditFlags_NoTooltip, ImVec2(20,20)))
color = ImVec4(saved_palette[n].x, saved_palette[n].y, saved_palette[n].z, color.w); // Preserve alpha!
if (ImGui::BeginDragDropTarget())
{
if (const ImGuiPayload* payload = AcceptDragDropPayload(IMGUI_PAYLOAD_TYPE_COLOR_3F))
memcpy((float*)&saved_palette[n], payload->Data, sizeof(float) * 3);
if (const ImGuiPayload* payload = AcceptDragDropPayload(IMGUI_PAYLOAD_TYPE_COLOR_4F))
memcpy((float*)&saved_palette[n], payload->Data, sizeof(float) * 4);
EndDragDropTarget();
}
ImGui::PopID();
}
ImGui::EndGroup();

4
imgui_draw.cpp
View File

@ -171,6 +171,7 @@ void ImGui::StyleColorsClassic(ImGuiStyle* dst)
colors[ImGuiCol_PlotHistogramHovered] = ImVec4(1.00f, 0.60f, 0.00f, 1.00f);
colors[ImGuiCol_TextSelectedBg] = ImVec4(0.00f, 0.00f, 1.00f, 0.35f);
colors[ImGuiCol_ModalWindowDarkening] = ImVec4(0.20f, 0.20f, 0.20f, 0.35f);
colors[ImGuiCol_DragDropTarget] = ImVec4(1.00f, 1.00f, 0.00f, 0.90f);
}
void ImGui::StyleColorsDark(ImGuiStyle* dst)
@ -220,6 +221,7 @@ void ImGui::StyleColorsDark(ImGuiStyle* dst)
colors[ImGuiCol_PlotHistogramHovered] = ImVec4(1.00f, 0.60f, 0.00f, 1.00f);
colors[ImGuiCol_TextSelectedBg] = ImVec4(0.26f, 0.59f, 0.98f, 0.35f);
colors[ImGuiCol_ModalWindowDarkening] = ImVec4(0.80f, 0.80f, 0.80f, 0.35f);
colors[ImGuiCol_DragDropTarget] = ImVec4(1.00f, 1.00f, 0.00f, 0.90f);
}
void ImGui::StyleColorsLight(ImGuiStyle* dst)
@ -271,9 +273,9 @@ void ImGui::StyleColorsLight(ImGuiStyle* dst)
colors[ImGuiCol_PlotHistogramHovered] = ImVec4(1.00f, 0.45f, 0.00f, 1.00f);
colors[ImGuiCol_TextSelectedBg] = ImVec4(0.26f, 0.59f, 0.98f, 0.35f);
colors[ImGuiCol_ModalWindowDarkening] = ImVec4(0.20f, 0.20f, 0.20f, 0.35f);
colors[ImGuiCol_DragDropTarget] = ImVec4(0.26f, 0.59f, 0.98f, 0.95f);
}
//-----------------------------------------------------------------------------
// ImDrawList
//-----------------------------------------------------------------------------

31
imgui_internal.h
View File

@ -169,6 +169,9 @@ inline void operator delete(void*, ImPlacementNewDummy, void*) {}
// Types
//-----------------------------------------------------------------------------
// Internal Drag and Drop payload types. String starting with '_' are reserved for Dear ImGui.
#define IMGUI_PAYLOAD_TYPE_DOCKABLE "_IMDOCK" // ImGuiWindow* // [Internal] Docking/tabs
enum ImGuiButtonFlags_
{
ImGuiButtonFlags_Repeat = 1 << 0, // hold to repeat
@ -182,7 +185,8 @@ enum ImGuiButtonFlags_
ImGuiButtonFlags_Disabled = 1 << 8, // disable interactions
ImGuiButtonFlags_AlignTextBaseLine = 1 << 9, // vertically align button to match text baseline (ButtonEx() only)
ImGuiButtonFlags_NoKeyModifiers = 1 << 10, // disable interaction if a key modifier is held
ImGuiButtonFlags_NoHoldingActiveID = 1 << 11 // don't set ActiveId while holding the mouse (ImGuiButtonFlags_PressedOnClick only)
ImGuiButtonFlags_NoHoldingActiveID = 1 << 11, // don't set ActiveId while holding the mouse (ImGuiButtonFlags_PressedOnClick only)
ImGuiButtonFlags_PressedOnDragDropHold = 1 << 12 // press when held into while we are drag and dropping another item (used by e.g. tree nodes, collapsing headers)
};
enum ImGuiSliderFlags_
@ -485,6 +489,20 @@ struct ImGuiContext
ImGuiMouseCursor MouseCursor;
ImGuiMouseCursorData MouseCursorData[ImGuiMouseCursor_Count_];
// Drag and Drop
bool DragDropActive;
ImGuiDragDropFlags DragDropSourceFlags;
int DragDropMouseButton;
ImGuiPayload DragDropPayload;
ImRect DragDropTargetRect;
ImGuiID DragDropTargetId;
float DragDropAcceptIdCurrRectSurface;
ImGuiID DragDropAcceptIdCurr; // Target item id (set at the time of accepting the payload)
ImGuiID DragDropAcceptIdPrev; // Target item id from previous frame (we need to store this to allow for overlapping drag and drop targets)
int DragDropAcceptFrameCount; // Last time a target expressed a desire to accept the source
ImVector<unsigned char> DragDropPayloadBufHeap; // We don't expose the ImVector<> directly
unsigned char DragDropPayloadBufLocal[8];
// Widget state
ImGuiTextEditState InputTextState;
ImFont InputTextPasswordFont;
@ -566,6 +584,14 @@ struct ImGuiContext
SetNextTreeNodeOpenVal = false;
SetNextTreeNodeOpenCond = 0;
DragDropActive = false;
DragDropSourceFlags = 0;
DragDropMouseButton = -1;
DragDropTargetId = 0;
DragDropAcceptIdPrev = DragDropAcceptIdCurr = 0;
DragDropAcceptFrameCount = -1;
memset(DragDropPayloadBufLocal, 0, sizeof(DragDropPayloadBufLocal));
ScalarAsInputTextId = 0;
ColorEditOptions = ImGuiColorEditFlags__OptionsDefault;
DragCurrentValue = 0.0f;
@ -765,6 +791,7 @@ public:
ImGuiID GetID(const char* str, const char* str_end = NULL);
ImGuiID GetID(const void* ptr);
ImGuiID GetIDNoKeepAlive(const char* str, const char* str_end = NULL);
ImGuiID GetIDFromRectangle(const ImRect& r_abs);
// We don't use g.FontSize because the window may be != g.CurrentWidow.
ImRect Rect() const { return ImRect(Pos.x, Pos.y, Pos.x+Size.x, Pos.y+Size.y); }
@ -841,6 +868,8 @@ namespace ImGui
IMGUI_API void VerticalSeparator(); // Vertical separator, for menu bars (use current line height). not exposed because it is misleading what it doesn't have an effect on regular layout.
IMGUI_API bool SplitterBehavior(ImGuiID id, const ImRect& bb, ImGuiAxis axis, float* size1, float* size2, float min_size1, float min_size2, float hover_extend = 0.0f);
IMGUI_API bool BeginDragDropTargetCustom(const ImRect& bb, ImGuiID id);
// FIXME-WIP: New Columns API
IMGUI_API void BeginColumns(const char* id, int count, ImGuiColumnsFlags flags = 0); // setup number of columns. use an identifier to distinguish multiple column sets. close with EndColumns().
IMGUI_API void EndColumns(); // close columns