Disabled: disabled items set HoveredId, allowing e.g. HoveredIdTimer to function. (#211, #3419) + Menus: fix hovering a disabled menu or menu item not closing other menus.

Rework of https://github.com/rokups/imgui/commit/c24b470
Note that the declared intent of that commit "Prevents window from being dragged if mouse hovers a disabled item." was already fullfilled by a876ad87.
Changes in ButtonBehavior() not needed anymore since ImGuiButtonFlags_Disabled is gone

docs/CHANGELOG.txt

@@ -39,6 +39,9 @@ Breaking Changes:
 
 - Backends: SDL2: removed unnecessary SDL_Window* parameter from ImGui_ImplSDL2_NewFrame(). (#3244) [@funchal]
   Kept inline redirection function (will obsolete).
+- Internals: (for custom widgets): because disabled items now sets HoveredId, if you want custom widgets to
+  not react as hovered when disabled, in the majority of use cases it is preferable to check the "hovered"
+  return value of ButtonBehavior() rather than (HoveredId == id).
 
 Other Changes:
 - Windows: ImGuiWindowFlags_UnsavedDocument/ImGuiTabItmeFlags_UnsavedDocument display a dot instead of a '*' so it
@@ -55,7 +58,9 @@ Other Changes:
 - InputInt/InputFloat: When used with Steps values and _ReadOnly flag, the step button look disabled. (#211)
 - Drag and Drop: drop target highlight doesn't try to bypass host clipping rectangle. (#4281, #3272)
 - Menus: MenuItem() and BeginMenu() are not affected/overlapping when style.SelectableTextAlign is altered.
+- Menus: fix hovering a disabled menu or menu item not closing other menus. (#211)
 - Nav: Disabled items are not candidate for default focus. (#211, #787)
+- Disabled: disabled items set HoveredId, allowing e.g. HoveredIdTimer to function. (#211, #3419) [@rokups]
 - Disabled: disabled mode more consistently release active id if the active item got disabled. (#211)
 - Disabled: disabled mode doesn't prevent Selectable() from looking selected. (#211)
 - Fixed printf-style format checks on non-MinGW flavors. (#4183, #3592)

imgui.cpp

@@ -3216,7 +3216,7 @@ bool ImGui::ItemHoverable(const ImRect& bb, ImGuiID id)
         return false;
     if (g.NavDisableMouseHover)
         return false;
-    if (!IsWindowContentHoverable(window, ImGuiHoveredFlags_None) || (g.CurrentItemFlags & ImGuiItemFlags_Disabled))
+    if (!IsWindowContentHoverable(window, ImGuiHoveredFlags_None))
     {
         g.HoveredIdDisabled = true;
         return false;
@@ -3225,9 +3225,17 @@ bool ImGui::ItemHoverable(const ImRect& bb, ImGuiID id)
     // We exceptionally allow this function to be called with id==0 to allow using it for easy high-level
     // hover test in widgets code. We could also decide to split this function is two.
     if (id != 0)
-    {
         SetHoveredID(id);
 
+    // When disabled we'll return false but still set HoveredId
+    if (g.CurrentItemFlags & ImGuiItemFlags_Disabled)
+    {
+        g.HoveredIdDisabled = true;
+        return false;
+    }
+
+    if (id != 0)
+    {
         // [DEBUG] Item Picker tool!
         // We perform the check here because SetHoveredID() is not frequently called (1~ time a frame), making
         // the cost of this tool near-zero. We can get slightly better call-stack and support picking non-hovered

imgui_widgets.cpp

@@ -1445,7 +1445,7 @@ bool ImGui::SplitterBehavior(const ImRect& bb, ImGuiID id, ImGuiAxis axis, float
     if (g.ActiveId != id)
         SetItemAllowOverlap();
 
-    if (held || (g.HoveredId == id && g.HoveredIdPreviousFrame == id && g.HoveredIdTimer >= hover_visibility_delay))
+    if (held || (hovered && g.HoveredIdPreviousFrame == id && g.HoveredIdTimer >= hover_visibility_delay))
         SetMouseCursor(axis == ImGuiAxis_Y ? ImGuiMouseCursor_ResizeNS : ImGuiMouseCursor_ResizeEW);
 
     ImRect bb_render = bb;
@@ -2431,7 +2431,7 @@ bool ImGui::DragScalar(const char* label, ImGuiDataType data_type, void* p_data,
     }
 
     // Draw frame
-    const ImU32 frame_col = GetColorU32(g.ActiveId == id ? ImGuiCol_FrameBgActive : g.HoveredId == id ? ImGuiCol_FrameBgHovered : ImGuiCol_FrameBg);
+    const ImU32 frame_col = GetColorU32(g.ActiveId == id ? ImGuiCol_FrameBgActive : hovered ? ImGuiCol_FrameBgHovered : ImGuiCol_FrameBg);
     RenderNavHighlight(frame_bb, id);
     RenderFrame(frame_bb.Min, frame_bb.Max, frame_col, true, style.FrameRounding);
 
@@ -3037,7 +3037,7 @@ bool ImGui::SliderScalar(const char* label, ImGuiDataType data_type, void* p_dat
     }
 
     // Draw frame
-    const ImU32 frame_col = GetColorU32(g.ActiveId == id ? ImGuiCol_FrameBgActive : g.HoveredId == id ? ImGuiCol_FrameBgHovered : ImGuiCol_FrameBg);
+    const ImU32 frame_col = GetColorU32(g.ActiveId == id ? ImGuiCol_FrameBgActive : hovered ? ImGuiCol_FrameBgHovered : ImGuiCol_FrameBg);
     RenderNavHighlight(frame_bb, id);
     RenderFrame(frame_bb.Min, frame_bb.Max, frame_col, true, g.Style.FrameRounding);
 
@@ -3185,7 +3185,7 @@ bool ImGui::VSliderScalar(const char* label, const ImVec2& size, ImGuiDataType d
     }
 
     // Draw frame
-    const ImU32 frame_col = GetColorU32(g.ActiveId == id ? ImGuiCol_FrameBgActive : g.HoveredId == id ? ImGuiCol_FrameBgHovered : ImGuiCol_FrameBg);
+    const ImU32 frame_col = GetColorU32(g.ActiveId == id ? ImGuiCol_FrameBgActive : hovered ? ImGuiCol_FrameBgHovered : ImGuiCol_FrameBg);
     RenderNavHighlight(frame_bb, id);
     RenderFrame(frame_bb.Min, frame_bb.Max, frame_col, true, g.Style.FrameRounding);
 
@@ -7964,7 +7964,6 @@ bool    ImGui::TabItemEx(ImGuiTabBar* tab_bar, const char* label, bool* p_open,
     bool pressed = ButtonBehavior(bb, id, &hovered, &held, button_flags);
     if (pressed && !is_tab_button)
         tab_bar->NextSelectedTabId = id;
-    hovered |= (g.HoveredId == 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 (g.ActiveId != id)
@@ -8028,8 +8027,11 @@ bool    ImGui::TabItemEx(ImGuiTabBar* tab_bar, const char* label, bool* p_open,
         PopClipRect();
     window->DC.CursorPos = backup_main_cursor_pos;
 
-    // Tooltip (FIXME: Won't work over the close button because ItemOverlap systems messes up with HoveredIdTimer)
+    // Tooltip
-    // We test IsItemHovered() to discard e.g. when another item is active or drag and drop over the tab bar (which g.HoveredId ignores)
+    // (Won't work over the close button because ItemOverlap systems messes up with HoveredIdTimer-> seems ok)
+    // (We test IsItemHovered() to discard e.g. when another item is active or drag and drop over the tab bar, which g.HoveredId ignores)
+    // FIXME: This is a mess.
+    // FIXME: We may want disabled tab to still display the tooltip?
     if (text_clipped && g.HoveredId == id && !held && g.HoveredIdNotActiveTimer > g.TooltipSlowDelay && IsItemHovered())
         if (!(tab_bar->Flags & ImGuiTabBarFlags_NoTooltip) && !(tab->Flags & ImGuiTabItemFlags_NoTooltip))
             SetTooltip("%.*s", (int)(FindRenderedTextEnd(label) - label), label);