Tools: Item Picker: Mouse button can be changed by holding Ctrl+Shift. (#2673)

docs/CHANGELOG.txt

@@ -43,6 +43,8 @@ Other Changes:
   Enter keep the input active and select all text.
 - Nav: Fixed moving/resizing window with gamepad or keyboard when running at very high framerate.
 - Misc: io.Framerate moving average now converge in 60 frames instead of 120. (#5236, #4138)
+- Tools: Item Picker: Mouse button can be changed by holding Ctrl+Shift, making it easier
+  to use the Item Picker in e.g. menus. (#2673)
 - Backends: Metal: Use __bridge for ARC based systems. (#5403) [@stack]
 - Backends: Metal: Add dispatch synchronization. (#5447) [@luigifcruz]
 - Backends: OSX: Fixes to support full app creation in C++. (#5403) [@stack]

imgui.cpp

@@ -13229,16 +13229,24 @@ void ImGui::UpdateDebugToolItemPicker()
     SetMouseCursor(ImGuiMouseCursor_Hand);
     if (IsKeyPressed(ImGuiKey_Escape))
         g.DebugItemPickerActive = false;
-    if (IsMouseClicked(0) && hovered_id)
+    const bool change_mapping = g.IO.KeyMods == (ImGuiModFlags_Ctrl | ImGuiModFlags_Shift);
+    if (!change_mapping && IsMouseClicked(g.DebugItemPickerMouseButton) && hovered_id)
     {
         g.DebugItemPickerBreakId = hovered_id;
         g.DebugItemPickerActive = false;
     }
-    SetNextWindowBgAlpha(0.60f);
+    for (int mouse_button = 0; mouse_button < 3; mouse_button++)
+        if (change_mapping && IsMouseClicked(mouse_button))
+            g.DebugItemPickerMouseButton = (ImU8)mouse_button;
+    SetNextWindowBgAlpha(0.70f);
     BeginTooltip();
     Text("HoveredId: 0x%08X", hovered_id);
     Text("Press ESC to abort picking.");
-    TextColored(GetStyleColorVec4(hovered_id ? ImGuiCol_Text : ImGuiCol_TextDisabled), "Click to break in debugger!");
+    const char* mouse_button_names[] = { "Left", "Right", "Middle" };
+    if (change_mapping)
+        Text("Remap w/ Ctrl+Shift: click anywhere to select new mouse button.");
+    else
+        TextColored(GetStyleColorVec4(hovered_id ? ImGuiCol_Text : ImGuiCol_TextDisabled), "Click %s Button to break in debugger! (remap w/ Ctrl+Shift)", mouse_button_names[g.DebugItemPickerMouseButton]);
     EndTooltip();
 }
 

imgui_demo.cpp

@@ -7805,7 +7805,8 @@ void ShowExampleAppDocuments(bool* p_open)
             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")) {}
+            if (ImGui::MenuItem("Exit", "Ctrl+F4") && p_open)
+                *p_open = false;
             ImGui::EndMenu();
         }
         ImGui::EndMenuBar();

imgui_internal.h

@@ -1822,6 +1822,7 @@ struct ImGuiContext
     ImGuiDebugLogFlags      DebugLogFlags;
     ImGuiTextBuffer         DebugLogBuf;
     bool                    DebugItemPickerActive;              // Item picker is active (started with DebugStartItemPicker())
+    ImU8                    DebugItemPickerMouseButton;
     ImGuiID                 DebugItemPickerBreakId;             // Will call IM_DEBUG_BREAK() when encountering this ID
     ImGuiMetricsConfig      DebugMetricsConfig;
     ImGuiStackTool          DebugStackTool;
@@ -1979,6 +1980,7 @@ struct ImGuiContext
 
         DebugLogFlags = ImGuiDebugLogFlags_OutputToTTY;
         DebugItemPickerActive = false;
+        DebugItemPickerMouseButton = ImGuiMouseButton_Left;
         DebugItemPickerBreakId = 0;
 
         memset(FramerateSecPerFrame, 0, sizeof(FramerateSecPerFrame));