Merge branch 'master' into docking

# Conflicts:
#	docs/CHANGELOG.txt
#	imgui_internal.h

docs/CHANGELOG.txt

@@ -99,10 +99,28 @@ Other changes:
   to make the examples main.cpp easier to read.
 
 
+-----------------------------------------------------------------------
+ VERSION 1.77 WIP (In Progress)
+-----------------------------------------------------------------------
+
+Breaking Changes:
+
+Other Changes:
+
+- TreeNode: Fixed bug where BeginDragDropSource() failed when the _OpenOnDoubleClick flag is
+  enabled (bug introduced in 1.76, but pre-1.76 it would also fail unless the _OpenOnArrow
+  flag was also set, and _OpenOnArrow is frequently set along with _OpenOnDoubleClick).
+- TreeNode: Fixed bug where dragging a payload over a TreeNode() with either _OpenOnDoubleClick
+  or _OpenOnArrow would open the node. (#143)
+- Backends: Win32: Support for #define NOGDI, won't try to call GetDeviceCaps(). (#3137, #2327)
+
+
 -----------------------------------------------------------------------
  VERSION 1.76 (Released 2020-04-12)
 -----------------------------------------------------------------------
 
+Decorated log: https://github.com/ocornut/imgui/releases/tag/v1.76
+
 Other Changes:
 
 - Drag and Drop, Nav: Disabling navigation arrow keys when drag and drop is active. In the docking

docs/FAQ.md

@@ -168,7 +168,7 @@ Unique ID are implicitly built from the hash of multiple elements that identify
 - Unique ID are often derived from a string label and at minimum scoped within their host window:
 ```c
 Begin("MyWindow");
-Button("OK");          // Label = "OK",     ID = hash of ("MyWindow" "OK")
+Button("OK");          // Label = "OK",     ID = hash of ("MyWindow", "OK")
 Button("Cancel");      // Label = "Cancel", ID = hash of ("MyWindow", "Cancel")
 End();
 ```

docs/README.md

@@ -97,7 +97,7 @@ Calling the `ImGui::ShowDemoWindow()` function will create a demo window showcas
 ![screenshot demo](https://raw.githubusercontent.com/wiki/ocornut/imgui/web/v167/v167-misc.png)
 
 You should be able to build the examples from sources (tested on Windows/Mac/Linux). If you don't, let me know! If you want to have a quick look at some Dear ImGui features, you can download Windows binaries of the demo app here:
-- [imgui-demo-binaries-20190715.zip](http://www.dearimgui.org/binaries/imgui-demo-binaries-20200412.zip) (Windows binaries, 1.76 WIP, built 2020/04/12, master branch, 5 executables) or [older demo binaries](http://www.dearimgui.org/binaries).
+- [imgui-demo-binaries-20190715.zip](http://www.dearimgui.org/binaries/imgui-demo-binaries-20200412.zip) (Windows binaries, 1.76, built 2020/04/12, master branch) or [older demo binaries](http://www.dearimgui.org/binaries).
 
 The demo applications are not DPI aware so expect some blurriness on a 4K screen. For DPI awareness in your application, you can load/reload your font at different scale, and scale your style with `style.ScaleAllSizes()`.
 
@@ -114,7 +114,7 @@ Officially maintained bindings (in repository):
 
 Third-party bindings (see [Bindings](https://github.com/ocornut/imgui/wiki/Bindings/) page):
 - Languages: C, C#/.Net, ChaiScript, D, Go, Haskell, Haxe/hxcpp, Java, JavaScript, Julia, Kotlin, Lua, Odin, Pascal, PureBasic, Python, Ruby, Rust, Swift...
-- Frameworks: AGS/Adventure Game Studio, Amethyst, bsf, Cinder, Cocos2d-x, Diligent Engine, Flexium, GML/Game Maker Studio2, GTK3+OpenGL3, Irrlicht Engine, LÖVE+LUA, Magnum, NanoRT, Nim Game Lib, Ogre, openFrameworks, OSG/OpenSceneGraph, Orx, px_render, Qt/QtDirect3D, SFML, Sokol, Unreal Engine 4, vtk, Win32 GDI.
+- Frameworks: AGS/Adventure Game Studio, Amethyst, bsf, Cinder, Cocos2d-x, Diligent Engine, Flexium, GML/Game Maker Studio2, GTK3+OpenGL3, Irrlicht Engine, LÖVE+LUA, Magnum, NanoRT, Nim Game Lib, Ogre, openFrameworks, OSG/OpenSceneGraph, Orx, Photoshop, px_render, Qt/QtDirect3D, SFML, Sokol, Unity, Unreal Engine 4, vtk, Win32 GDI, WxWidgets.
 - Note that C bindings ([cimgui](https://github.com/cimgui/cimgui)) are auto-generated, you can use its json/lua output to generate bindings for other languages.
 
 Also see [Wiki](https://github.com/ocornut/imgui/wiki) for more links and ideas.

examples/README.txt

@@ -1,5 +1,5 @@
 -----------------------------------------------------------------------
- dear imgui, v1.76
+ dear imgui, v1.77 WIP
 -----------------------------------------------------------------------
  examples/README.txt
  (This is the README file for the examples/ folder. See docs/ for more documentation)

examples/imgui_impl_win32.cpp

@@ -494,7 +494,7 @@ void ImGui_ImplWin32_EnableDpiAwareness()
     SetProcessDPIAware();
 }
 
-#ifdef _MSC_VER
+#if defined(_MSC_VER) && !defined(NOGDI)
 #pragma comment(lib, "gdi32")   // Link with gdi32.lib for GetDeviceCaps()
 #endif
 
@@ -507,6 +507,7 @@ float ImGui_ImplWin32_GetDpiScaleForMonitor(void* monitor)
         if (PFN_GetDpiForMonitor GetDpiForMonitorFn = (PFN_GetDpiForMonitor)::GetProcAddress(shcore_dll, "GetDpiForMonitor"))
             GetDpiForMonitorFn((HMONITOR)monitor, MDT_EFFECTIVE_DPI, &xdpi, &ydpi);
     }
+#ifndef NOGDI
     else
     {
         const HDC dc = ::GetDC(NULL);
@@ -514,6 +515,7 @@ float ImGui_ImplWin32_GetDpiScaleForMonitor(void* monitor)
         ydpi = ::GetDeviceCaps(dc, LOGPIXELSY);
         ::ReleaseDC(NULL, dc);
     }
+#endif
     IM_ASSERT(xdpi == ydpi); // Please contact me if you hit this assert!
     return xdpi / 96.0f;
 }

imgui.cpp

@@ -1,4 +1,4 @@
-// dear imgui, v1.76
+// dear imgui, v1.77 WIP
 // (main code and documentation)
 
 // Help:
@@ -2942,6 +2942,10 @@ ImGuiID ImGuiWindow::GetID(const char* str, const char* str_end)
     ImGuiID seed = IDStack.back();
     ImGuiID id = ImHashStr(str, str_end ? (str_end - str) : 0, seed);
     ImGui::KeepAliveID(id);
+#ifdef IMGUI_ENABLE_TEST_ENGINE
+    ImGuiContext& g = *GImGui;
+    IMGUI_TEST_ENGINE_ID_INFO2(id, ImGuiDataType_String, str, str_end);
+#endif
     return id;
 }
 
@@ -2950,6 +2954,10 @@ ImGuiID ImGuiWindow::GetID(const void* ptr)
     ImGuiID seed = IDStack.back();
     ImGuiID id = ImHashData(&ptr, sizeof(void*), seed);
     ImGui::KeepAliveID(id);
+#ifdef IMGUI_ENABLE_TEST_ENGINE
+    ImGuiContext& g = *GImGui;
+    IMGUI_TEST_ENGINE_ID_INFO(id, ImGuiDataType_Pointer, ptr);
+#endif
     return id;
 }
 
@@ -2958,25 +2966,44 @@ ImGuiID ImGuiWindow::GetID(int n)
     ImGuiID seed = IDStack.back();
     ImGuiID id = ImHashData(&n, sizeof(n), seed);
     ImGui::KeepAliveID(id);
+#ifdef IMGUI_ENABLE_TEST_ENGINE
+    ImGuiContext& g = *GImGui;
+    IMGUI_TEST_ENGINE_ID_INFO(id, ImGuiDataType_S32, (intptr_t)n);
+#endif
     return id;
 }
 
 ImGuiID ImGuiWindow::GetIDNoKeepAlive(const char* str, const char* str_end)
 {
     ImGuiID seed = IDStack.back();
-    return ImHashStr(str, str_end ? (str_end - str) : 0, seed);
+    ImGuiID id = ImHashStr(str, str_end ? (str_end - str) : 0, seed);
+#ifdef IMGUI_ENABLE_TEST_ENGINE
+    ImGuiContext& g = *GImGui;
+    IMGUI_TEST_ENGINE_ID_INFO2(id, ImGuiDataType_String, str, str_end);
+#endif
+    return id;
 }
 
 ImGuiID ImGuiWindow::GetIDNoKeepAlive(const void* ptr)
 {
     ImGuiID seed = IDStack.back();
-    return ImHashData(&ptr, sizeof(void*), seed);
+    ImGuiID id = ImHashData(&ptr, sizeof(void*), seed);
+#ifdef IMGUI_ENABLE_TEST_ENGINE
+    ImGuiContext& g = *GImGui;
+    IMGUI_TEST_ENGINE_ID_INFO(id, ImGuiDataType_Pointer, ptr);
+#endif
+    return id;
 }
 
 ImGuiID ImGuiWindow::GetIDNoKeepAlive(int n)
 {
     ImGuiID seed = IDStack.back();
-    return ImHashData(&n, sizeof(n), seed);
+    ImGuiID id = ImHashData(&n, sizeof(n), seed);
+#ifdef IMGUI_ENABLE_TEST_ENGINE
+    ImGuiContext& g = *GImGui;
+    IMGUI_TEST_ENGINE_ID_INFO(id, ImGuiDataType_S32, (intptr_t)n);
+#endif
+    return id;
 }
 
 // This is only used in rare/specific situations to manufacture an ID out of nowhere.
@@ -3976,6 +4003,7 @@ void ImGui::NewFrame()
     g.DragDropAcceptIdCurrRectSurface = FLT_MAX;
     g.DragDropWithinSource = false;
     g.DragDropWithinTarget = false;
+    g.DragDropHoldJustPressedId = 0;
 
     // Update keyboard input state
     // Synchronize io.KeyMods with individual modifiers io.KeyXXX bools
@@ -5924,6 +5952,7 @@ bool ImGui::Begin(const char* name, bool* p_open, ImGuiWindowFlags flags)
         UpdateWindowParentAndRootLinks(window, flags, parent_window);
 
     // Process SetNextWindow***() calls
+    // (FIXME: Consider splitting the HasXXX flags into X/Y components
     bool window_pos_set_by_api = false;
     bool window_size_x_set_by_api = false, window_size_y_set_by_api = false;
     if (g.NextWindowData.Flags & ImGuiNextWindowDataFlags_HasPos)
@@ -5948,6 +5977,19 @@ bool ImGui::Begin(const char* name, bool* p_open, ImGuiWindowFlags flags)
         window_size_y_set_by_api = (window->SetWindowSizeAllowFlags & g.NextWindowData.SizeCond) != 0 && (g.NextWindowData.SizeVal.y > 0.0f);
         SetWindowSize(window, g.NextWindowData.SizeVal, g.NextWindowData.SizeCond);
     }
+    if (g.NextWindowData.Flags & ImGuiNextWindowDataFlags_HasScroll)
+    {
+        if (g.NextWindowData.ScrollVal.x >= 0.0f)
+        {
+            window->ScrollTarget.x = g.NextWindowData.ScrollVal.x;
+            window->ScrollTargetCenterRatio.x = 0.0f;
+        }
+        if (g.NextWindowData.ScrollVal.y >= 0.0f)
+        {
+            window->ScrollTarget.y = g.NextWindowData.ScrollVal.y;
+            window->ScrollTargetCenterRatio.y = 0.0f;
+        }
+    }
     if (g.NextWindowData.Flags & ImGuiNextWindowDataFlags_HasContentSize)
         window->ContentSizeExplicit = g.NextWindowData.ContentSizeVal;
     else if (first_begin_of_the_frame)
@@ -7172,6 +7214,13 @@ void ImGui::SetNextWindowContentSize(const ImVec2& size)
     g.NextWindowData.ContentSizeVal = size;
 }
 
+void ImGui::SetNextWindowScroll(const ImVec2& scroll)
+{
+    ImGuiContext& g = *GImGui;
+    g.NextWindowData.Flags |= ImGuiNextWindowDataFlags_HasScroll;
+    g.NextWindowData.ScrollVal = scroll;
+}
+
 void ImGui::SetNextWindowCollapsed(bool collapsed, ImGuiCond cond)
 {
     ImGuiContext& g = *GImGui;
@@ -7322,32 +7371,41 @@ ImGuiStorage* ImGui::GetStateStorage()
 
 void ImGui::PushID(const char* str_id)
 {
-    ImGuiWindow* window = GImGui->CurrentWindow;
-    window->IDStack.push_back(window->GetIDNoKeepAlive(str_id));
+    ImGuiContext& g = *GImGui;
+    ImGuiWindow* window = g.CurrentWindow;
+    ImGuiID id = window->GetIDNoKeepAlive(str_id);
+    window->IDStack.push_back(id);
 }
 
 void ImGui::PushID(const char* str_id_begin, const char* str_id_end)
 {
-    ImGuiWindow* window = GImGui->CurrentWindow;
-    window->IDStack.push_back(window->GetIDNoKeepAlive(str_id_begin, str_id_end));
+    ImGuiContext& g = *GImGui;
+    ImGuiWindow* window = g.CurrentWindow;
+    ImGuiID id = window->GetIDNoKeepAlive(str_id_begin, str_id_end);
+    window->IDStack.push_back(id);
 }
 
 void ImGui::PushID(const void* ptr_id)
 {
-    ImGuiWindow* window = GImGui->CurrentWindow;
-    window->IDStack.push_back(window->GetIDNoKeepAlive(ptr_id));
+    ImGuiContext& g = *GImGui;
+    ImGuiWindow* window = g.CurrentWindow;
+    ImGuiID id = window->GetIDNoKeepAlive(ptr_id);
+    window->IDStack.push_back(id);
 }
 
 void ImGui::PushID(int int_id)
 {
-    ImGuiWindow* window = GImGui->CurrentWindow;
-    window->IDStack.push_back(window->GetIDNoKeepAlive(int_id));
+    ImGuiContext& g = *GImGui;
+    ImGuiWindow* window = g.CurrentWindow;
+    ImGuiID id = window->GetIDNoKeepAlive(int_id);
+    window->IDStack.push_back(id);
 }
 
 // Push a given id value ignoring the ID stack as a seed.
 void ImGui::PushOverrideID(ImGuiID id)
 {
-    ImGuiWindow* window = GImGui->CurrentWindow;
+    ImGuiContext& g = *GImGui;
+    ImGuiWindow* window = g.CurrentWindow;
     window->IDStack.push_back(id);
 }
 

imgui.h

@@ -1,4 +1,4 @@
-// dear imgui, v1.76
+// dear imgui, v1.77 WIP
 // (headers)
 
 // Help:
@@ -60,8 +60,8 @@ Index of this file:
 
 // Version
 // (Integer encoded as XYYZZ for use in #if preprocessor conditionals. Work in progress versions typically starts at XYY99 then bounce up to XYY00, XYY01 etc. when release tagging happens)
-#define IMGUI_VERSION               "1.76"
-#define IMGUI_VERSION_NUM           17600
+#define IMGUI_VERSION               "1.77 WIP"
+#define IMGUI_VERSION_NUM           17601
 #define IMGUI_CHECKVERSION()        ImGui::DebugCheckVersionAndDataLayout(IMGUI_VERSION, sizeof(ImGuiIO), sizeof(ImGuiStyle), sizeof(ImVec2), sizeof(ImVec4), sizeof(ImDrawVert), sizeof(ImDrawIdx))
 #define IMGUI_HAS_VIEWPORT          1 // Viewport WIP branch
 #define IMGUI_HAS_DOCK              1 // Docking WIP branch

imgui_demo.cpp

@@ -1,4 +1,4 @@
-// dear imgui, v1.76
+// dear imgui, v1.77 WIP
 // (demo code)
 
 // Help:
@@ -696,11 +696,13 @@ static void ShowDemoWindowWidgets()
             HelpMarker("This is a more typical looking tree with selectable nodes.\nClick to select, CTRL+Click to toggle, click on arrows or double-click to open.");
             static ImGuiTreeNodeFlags base_flags = ImGuiTreeNodeFlags_OpenOnArrow | ImGuiTreeNodeFlags_OpenOnDoubleClick | ImGuiTreeNodeFlags_SpanAvailWidth;
             static bool align_label_with_current_x_position = false;
+            static bool test_drag_and_drop = false;
             ImGui::CheckboxFlags("ImGuiTreeNodeFlags_OpenOnArrow", (unsigned int*)&base_flags, ImGuiTreeNodeFlags_OpenOnArrow);
             ImGui::CheckboxFlags("ImGuiTreeNodeFlags_OpenOnDoubleClick", (unsigned int*)&base_flags, ImGuiTreeNodeFlags_OpenOnDoubleClick);
             ImGui::CheckboxFlags("ImGuiTreeNodeFlags_SpanAvailWidth", (unsigned int*)&base_flags, ImGuiTreeNodeFlags_SpanAvailWidth); ImGui::SameLine(); HelpMarker("Extend hit area to all available width instead of allowing more items to be layed out after the node.");
             ImGui::CheckboxFlags("ImGuiTreeNodeFlags_SpanFullWidth", (unsigned int*)&base_flags, ImGuiTreeNodeFlags_SpanFullWidth);
             ImGui::Checkbox("Align label with current X position", &align_label_with_current_x_position);
+            ImGui::Checkbox("Test tree node as drag source", &test_drag_and_drop);
             ImGui::Text("Hello!");
             if (align_label_with_current_x_position)
                 ImGui::Unindent(ImGui::GetTreeNodeToLabelSpacing());
@@ -720,6 +722,12 @@ static void ShowDemoWindowWidgets()
                     bool node_open = ImGui::TreeNodeEx((void*)(intptr_t)i, node_flags, "Selectable Node %d", i);
                     if (ImGui::IsItemClicked())
                         node_clicked = i;
+                    if (test_drag_and_drop && ImGui::BeginDragDropSource())
+                    {
+                        ImGui::SetDragDropPayload("_TREENODE", NULL, 0);
+                        ImGui::Text("This is a drag and drop source");
+                        ImGui::EndDragDropSource();
+                    }
                     if (node_open)
                     {
                         ImGui::BulletText("Blah blah\nBlah Blah");
@@ -735,6 +743,12 @@ static void ShowDemoWindowWidgets()
                     ImGui::TreeNodeEx((void*)(intptr_t)i, node_flags, "Selectable Leaf %d", i);
                     if (ImGui::IsItemClicked())
                         node_clicked = i;
+                    if (test_drag_and_drop && ImGui::BeginDragDropSource())
+                    {
+                        ImGui::SetDragDropPayload("_TREENODE", NULL, 0);
+                        ImGui::Text("This is a drag and drop source");
+                        ImGui::EndDragDropSource();
+                    }
                 }
             }
             if (node_clicked != -1)

imgui_draw.cpp

@@ -1,4 +1,4 @@
-// dear imgui, v1.76
+// dear imgui, v1.77 WIP
 // (drawing and font code)
 
 /*

imgui_internal.h

@@ -1,4 +1,4 @@
-// dear imgui, v1.76
+// dear imgui, v1.77 WIP
 // (internal structures/api)
 
 // You may use this file to debug, understand or extend ImGui features but we don't provide any guarantee of forward compatibility!
@@ -735,6 +735,14 @@ struct ImGuiDataTypeInfo
     const char* ScanFmt;        // Default scanf format for the type
 };
 
+// Extend ImGuiDataType_
+enum ImGuiDataTypePrivate_
+{
+    ImGuiDataType_String = ImGuiDataType_COUNT + 1,
+    ImGuiDataType_Pointer,
+    ImGuiDataType_ID
+};
+
 // Stacked color modifier, backup of modified data so we can restore it
 struct ImGuiColorMod
 {
@@ -997,9 +1005,10 @@ enum ImGuiNextWindowDataFlags_
     ImGuiNextWindowDataFlags_HasSizeConstraint  = 1 << 4,
     ImGuiNextWindowDataFlags_HasFocus           = 1 << 5,
     ImGuiNextWindowDataFlags_HasBgAlpha         = 1 << 6,
-    ImGuiNextWindowDataFlags_HasViewport        = 1 << 7,
-    ImGuiNextWindowDataFlags_HasDock            = 1 << 8,
-    ImGuiNextWindowDataFlags_HasWindowClass     = 1 << 9
+    ImGuiNextWindowDataFlags_HasScroll          = 1 << 7,
+    ImGuiNextWindowDataFlags_HasViewport        = 1 << 8,
+    ImGuiNextWindowDataFlags_HasDock            = 1 << 9,
+    ImGuiNextWindowDataFlags_HasWindowClass     = 1 << 10
 };
 
 // Storage for SetNexWindow** functions
@@ -1014,6 +1023,7 @@ struct ImGuiNextWindowData
     ImVec2                      PosPivotVal;
     ImVec2                      SizeVal;
     ImVec2                      ContentSizeVal;
+    ImVec2                      ScrollVal;
     bool                        PosUndock;
     bool                        CollapsedVal;
     ImRect                      SizeConstraintRect;
@@ -1186,6 +1196,9 @@ struct ImGuiContext
     bool                    WithinFrameScope;                   // Set by NewFrame(), cleared by EndFrame()
     bool                    WithinFrameScopeWithImplicitWindow; // Set by NewFrame(), cleared by EndFrame() when the implicit debug window has been pushed
     bool                    WithinEndChild;                     // Set within EndChild()
+    bool                    TestEngineHookItems;                // Will call test engine hooks: ImGuiTestEngineHook_ItemAdd(), ImGuiTestEngineHook_ItemInfo(), ImGuiTestEngineHook_Log()
+    ImGuiID                 TestEngineHookIdInfo;               // Will call test engine hooks: ImGuiTestEngineHook_IdInfo() from GetID()
+    void*                   TestEngine;                         // Test engine user data
 
     // Windows state
     ImVector<ImGuiWindow*>  Windows;                            // Windows, sorted in display order, back to front
@@ -1325,6 +1338,7 @@ struct ImGuiContext
     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
+    ImGuiID                 DragDropHoldJustPressedId;          // Set when holding a payload just made ButtonBehavior() return a press.
     ImVector<unsigned char> DragDropPayloadBufHeap;             // We don't expose the ImVector<> directly, ImGuiPayload only holds pointer+size
     unsigned char           DragDropPayloadBufLocal[16];        // Local buffer for small payloads
 
@@ -1396,14 +1410,17 @@ struct ImGuiContext
     {
         Initialized = false;
         ConfigFlagsCurrFrame = ConfigFlagsLastFrame = ImGuiConfigFlags_None;
+        FontAtlasOwnedByContext = shared_font_atlas ? false : true;
         Font = NULL;
         FontSize = FontBaseSize = 0.0f;
-        FontAtlasOwnedByContext = shared_font_atlas ? false : true;
         IO.Fonts = shared_font_atlas ? shared_font_atlas : IM_NEW(ImFontAtlas)();
         Time = 0.0f;
         FrameCount = 0;
         FrameCountEnded = FrameCountPlatformEnded = FrameCountRendered = -1;
         WithinFrameScope = WithinFrameScopeWithImplicitWindow = WithinEndChild = false;
+        TestEngineHookItems = false;
+        TestEngineHookIdInfo = 0;
+        TestEngine = NULL;
 
         WindowsActiveCount = 0;
         CurrentWindow = NULL;
@@ -1491,6 +1508,7 @@ struct ImGuiContext
         DragDropAcceptIdCurrRectSurface = 0.0f;
         DragDropAcceptIdPrev = DragDropAcceptIdCurr = 0;
         DragDropAcceptFrameCount = -1;
+        DragDropHoldJustPressedId = 0;
         memset(DragDropPayloadBufLocal, 0, sizeof(DragDropPayloadBufLocal));
 
         CurrentTabBar = NULL;
@@ -1909,6 +1927,7 @@ namespace ImGui
     IMGUI_API ImGuiSettingsHandler* FindSettingsHandler(const char* type_name);
 
     // Scrolling
+    IMGUI_API void          SetNextWindowScroll(const ImVec2& scroll); // Use -1.0f on one axis to leave as-is
     IMGUI_API void          SetScrollX(ImGuiWindow* window, float new_scroll_x);
     IMGUI_API void          SetScrollY(ImGuiWindow* window, float new_scroll_y);
     IMGUI_API void          SetScrollFromPosX(ImGuiWindow* window, float local_x, float center_x_ratio = 0.5f);
@@ -2189,14 +2208,20 @@ extern void                 ImGuiTestEngineHook_PreNewFrame(ImGuiContext* ctx);
 extern void                 ImGuiTestEngineHook_PostNewFrame(ImGuiContext* ctx);
 extern void                 ImGuiTestEngineHook_ItemAdd(ImGuiContext* ctx, const ImRect& bb, ImGuiID id);
 extern void                 ImGuiTestEngineHook_ItemInfo(ImGuiContext* ctx, ImGuiID id, const char* label, ImGuiItemStatusFlags flags);
+extern void                 ImGuiTestEngineHook_IdInfo(ImGuiContext* ctx, ImGuiDataType data_type, ImGuiID id, const void* data_id);
+extern void                 ImGuiTestEngineHook_IdInfo(ImGuiContext* ctx, ImGuiDataType data_type, ImGuiID id, const void* data_id, const void* data_id_end);
 extern void                 ImGuiTestEngineHook_Log(ImGuiContext* ctx, const char* fmt, ...);
-#define IMGUI_TEST_ENGINE_ITEM_ADD(_BB, _ID)                ImGuiTestEngineHook_ItemAdd(&g, _BB, _ID)               // Register item bounding box
-#define IMGUI_TEST_ENGINE_ITEM_INFO(_ID, _LABEL, _FLAGS)    ImGuiTestEngineHook_ItemInfo(&g, _ID, _LABEL, _FLAGS)   // Register item label and status flags (optional)
-#define IMGUI_TEST_ENGINE_LOG(_FMT, ...)                    ImGuiTestEngineHook_Log(&g, _FMT, __VA_ARGS__)          // Custom log entry from user land into test log
+#define IMGUI_TEST_ENGINE_ITEM_ADD(_BB,_ID)                 if (g.TestEngineHookItems) ImGuiTestEngineHook_ItemAdd(&g, _BB, _ID)               // Register item bounding box
+#define IMGUI_TEST_ENGINE_ITEM_INFO(_ID,_LABEL,_FLAGS)      if (g.TestEngineHookItems) ImGuiTestEngineHook_ItemInfo(&g, _ID, _LABEL, _FLAGS)   // Register item label and status flags (optional)
+#define IMGUI_TEST_ENGINE_LOG(_FMT,...)                     if (g.TestEngineHookItems) ImGuiTestEngineHook_Log(&g, _FMT, __VA_ARGS__)          // Custom log entry from user land into test log
+#define IMGUI_TEST_ENGINE_ID_INFO(_ID,_TYPE,_DATA)          if (g.TestEngineHookIdInfo == id) ImGuiTestEngineHook_IdInfo(&g, _TYPE, _ID, (const void*)(_DATA));
+#define IMGUI_TEST_ENGINE_ID_INFO2(_ID,_TYPE,_DATA,_DATA2)  if (g.TestEngineHookIdInfo == id) ImGuiTestEngineHook_IdInfo(&g, _TYPE, _ID, (const void*)(_DATA), (const void*)(_DATA2));
 #else
-#define IMGUI_TEST_ENGINE_ITEM_ADD(_BB, _ID)                do { } while (0)
-#define IMGUI_TEST_ENGINE_ITEM_INFO(_ID, _LABEL, _FLAGS)    do { } while (0)
-#define IMGUI_TEST_ENGINE_LOG(_FMT, ...)                    do { } while (0)
+#define IMGUI_TEST_ENGINE_ITEM_ADD(_BB,_ID)                 do { } while (0)
+#define IMGUI_TEST_ENGINE_ITEM_INFO(_ID,_LABEL,_FLAGS)      do { } while (0)
+#define IMGUI_TEST_ENGINE_LOG(_FMT,...)                     do { } while (0)
+#define IMGUI_TEST_ENGINE_ID_INFO(_ID,_TYPE,_DATA)          do { } while (0)
+#define IMGUI_TEST_ENGINE_ID_INFO2(_ID,_TYPE,_DATA,_DATA2)  do { } while (0)
 #endif
 
 #if defined(__clang__)

imgui_widgets.cpp

@@ -1,4 +1,4 @@
-// dear imgui, v1.76
+// dear imgui, v1.77 WIP
 // (widgets code)
 
 /*
@@ -486,7 +486,7 @@ bool ImGui::ButtonBehavior(const ImRect& bb, ImGuiID id, bool* out_hovered, bool
 
 #ifdef IMGUI_ENABLE_TEST_ENGINE
     if (id != 0 && window->DC.LastItemId != id)
-        ImGuiTestEngineHook_ItemAdd(&g, bb, id);
+        IMGUI_TEST_ENGINE_ITEM_ADD(bb, id);
 #endif
 
     bool pressed = false;
@@ -500,11 +500,13 @@ bool ImGui::ButtonBehavior(const ImRect& bb, ImGuiID id, bool* out_hovered, bool
     if (g.DragDropActive && (flags & ImGuiButtonFlags_PressedOnDragDropHold) && !(g.DragDropSourceFlags & ImGuiDragDropFlags_SourceNoHoldToOpenOthers))
         if (IsItemHovered(ImGuiHoveredFlags_AllowWhenBlockedByActiveItem))
         {
+            const float DRAG_DROP_HOLD_TIMER = 0.70f;
             hovered = true;
             SetHoveredID(id);
-            if (CalcTypematicRepeatAmount(g.HoveredIdTimer + 0.0001f - g.IO.DeltaTime, g.HoveredIdTimer + 0.0001f, 0.70f, 0.00f))
+            if (CalcTypematicRepeatAmount(g.HoveredIdTimer + 0.0001f - g.IO.DeltaTime, g.HoveredIdTimer + 0.0001f, DRAG_DROP_HOLD_TIMER, 0.00f))
             {
                 pressed = true;
+                g.DragDropHoldJustPressedId = id;
                 FocusWindow(window);
             }
         }
@@ -1139,6 +1141,7 @@ bool ImGui::RadioButton(const char* label, bool active)
     if (label_size.x > 0.0f)
         RenderText(ImVec2(check_bb.Max.x + style.ItemInnerSpacing.x, check_bb.Min.y + style.FramePadding.y), label);
 
+    IMGUI_TEST_ENGINE_ITEM_INFO(id, label, window->DC.ItemFlags);
     return pressed;
 }
 
@@ -5370,10 +5373,11 @@ bool ImGui::TreeNodeBehavior(ImGuiID id, ImGuiTreeNodeFlags flags, const char* l
     // It is rather standard that arrow click react on Down rather than Up and we'd be tempted to make it the default
     // (by removing the _OpenOnArrow test below), however this would have a perhaps surprising effect on CollapsingHeader()?
     // So right now we are making this optional. May evolve later.
+    // We set ImGuiButtonFlags_PressedOnClickRelease on OpenOnDoubleClick because we want the item to be active on the initial MouseDown in order for drag and drop to work.
     if (is_mouse_x_over_arrow && (flags & ImGuiTreeNodeFlags_OpenOnArrow))
         button_flags |= ImGuiButtonFlags_PressedOnClick;
     else if (flags & ImGuiTreeNodeFlags_OpenOnDoubleClick)
-        button_flags |= ImGuiButtonFlags_PressedOnDoubleClick;
+        button_flags |= ImGuiButtonFlags_PressedOnClickRelease | ImGuiButtonFlags_PressedOnDoubleClick;
     else
         button_flags |= ImGuiButtonFlags_PressedOnClickRelease;
 
@@ -5385,7 +5389,7 @@ bool ImGui::TreeNodeBehavior(ImGuiID id, ImGuiTreeNodeFlags flags, const char* l
     bool toggled = false;
     if (!is_leaf)
     {
-        if (pressed)
+        if (pressed && g.DragDropHoldJustPressedId != id)
         {
             if ((flags & (ImGuiTreeNodeFlags_OpenOnArrow | ImGuiTreeNodeFlags_OpenOnDoubleClick)) == 0 || (g.NavActivateId == id))
                 toggled = true;
@@ -5393,8 +5397,12 @@ bool ImGui::TreeNodeBehavior(ImGuiID id, ImGuiTreeNodeFlags flags, const char* l
                 toggled |= is_mouse_x_over_arrow && !g.NavDisableMouseHover; // Lightweight equivalent of IsMouseHoveringRect() since ButtonBehavior() already did the job
             if ((flags & ImGuiTreeNodeFlags_OpenOnDoubleClick) && g.IO.MouseDoubleClicked[0])
                 toggled = true;
-            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;
+        }
+        else if (pressed && g.DragDropHoldJustPressedId == id)
+        {
+            IM_ASSERT(button_flags & ImGuiButtonFlags_PressedOnDragDropHold);
+            if (!is_open) // When using Drag and Drop "hold to open" we keep the node highlighted after opening, but never close it again.
+                toggled = true;
         }
 
         if (g.NavId == id && g.NavMoveRequest && g.NavMoveDir == ImGuiDir_Left && is_open)
@@ -5495,7 +5503,8 @@ void ImGui::TreePush(const void* ptr_id)
 
 void ImGui::TreePushOverrideID(ImGuiID id)
 {
-    ImGuiWindow* window = GetCurrentWindow();
+    ImGuiContext& g = *GImGui;
+    ImGuiWindow* window = g.CurrentWindow;
     Indent();
     window->DC.TreeDepth++;
     window->IDStack.push_back(id);
@@ -7098,6 +7107,7 @@ bool    ImGui::TabItemEx(ImGuiTabBar* tab_bar, const char* label, bool* p_open,
     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.
+    IMGUI_TEST_ENGINE_ITEM_INFO(id, label, window->DC.LastItemStatusFlags);
     if (p_open && !*p_open)
     {
         PushItemFlag(ImGuiItemFlags_NoNav | ImGuiItemFlags_NoNavDefaultFocus, true);