Drag and Drop: Calling BeginTooltip() between a BeginDragSource()/EndDragSource() or BeginDropTarget()/EndDropTarget() uses adjusted tooltip settings matching the one created when calling BeginDragSource() without the ImGuiDragDropFlags_SourceNoPreviewTooltip flag. (#143) + additional safety checks.

CHANGELOG.txt

@@ -47,6 +47,8 @@ Other Changes:
  - Drag and Drop: Fixed an incorrect assert when dropping a source that is submitted after the target (bug introduced with 1.62 changes 
    related to the addition of IsItemDeactivated()). (#1875, #143)
  - Drag and Drop: Fixed ImGuiDragDropFlags_SourceNoDisableHover to affect hovering state prior to calling IsItemHovered() + fixed description. (#143)
+ - Drag and Drop: Calling BeginTooltip() between a BeginDragSource()/EndDragSource() or BeginDropTarget()/EndDropTarget() uses adjusted tooltip
+   settings matching the one created when calling BeginDragSource() without the ImGuiDragDropFlags_SourceNoPreviewTooltip flag. (#143)
  - Misc: Added ImGuiMouseCursor_Hand cursor enum + corresponding software cursor. (#1913, 1914) [@aiekick, @ocornut] 
  - Misc: Tweaked software mouse cursor offset to match the offset of the corresponding Windows 10 cursors.
  - Fixed a include build issue for Cygwin in non-POSIX (Win32) mode. (#1917, #1319, #276)

imgui.cpp

@@ -3790,6 +3790,7 @@ void ImGui::NewFrame()
     g.DragDropAcceptIdPrev = g.DragDropAcceptIdCurr;
     g.DragDropAcceptIdCurr = 0;
     g.DragDropAcceptIdCurrRectSurface = FLT_MAX;
+    g.DragDropWithinSourceOrTarget = false;
 
     // Update keyboard input state
     memcpy(g.IO.KeysDownDurationPrev, g.IO.KeysDownDuration, sizeof(g.IO.KeysDownDuration));
@@ -5157,9 +5158,25 @@ void ImGui::SetTooltip(const char* fmt, ...)
 }
 
 void ImGui::BeginTooltip()
+{
+    ImGuiContext& g = *GImGui;
+    if (g.DragDropWithinSourceOrTarget)
+    {
+        // The default tooltip position is a little offset to give space to see the context menu (it's also clamped within the current viewport/monitor)
+        // In the context of a dragging tooltip we try to reduce that offset and we enforce following the cursor.
+        // Whatever we do we want to call SetNextWindowPos() to enforce a tooltip position and disable clipping the tooltip without our display area, like regular tooltip do.
+        //ImVec2 tooltip_pos = g.IO.MousePos - g.ActiveIdClickOffset - g.Style.WindowPadding;
+        ImVec2 tooltip_pos = g.IO.MousePos + ImVec2(16 * g.Style.MouseCursorScale, 8 * g.Style.MouseCursorScale);
+        SetNextWindowPos(tooltip_pos);
+        SetNextWindowBgAlpha(g.Style.Colors[ImGuiCol_PopupBg].w * 0.60f);
+        //PushStyleVar(ImGuiStyleVar_Alpha, g.Style.Alpha * 0.60f); // This would be nice but e.g ColorButton with checkboard has issue with transparent colors :(
+        BeginTooltipEx(0, true);
+    }
+    else
     {
         BeginTooltipEx(0, false);
     }
+}
 
 void ImGui::EndTooltip()
 {
@@ -13521,12 +13538,13 @@ bool ImGui::BeginDragDropSource(ImGuiDragDropFlags flags)
             g.DragDropSourceFlags = flags;
             g.DragDropMouseButton = mouse_button;
         }
+        g.DragDropWithinSourceOrTarget = true;
 
         if (!(flags & ImGuiDragDropFlags_SourceNoPreviewTooltip))
         {
             // Target can request the Source to not display its tooltip (we use a dedicated flag to make this request explicit)
             // We unfortunately can't just modify the source flags and skip the call to BeginTooltip, as caller may be emitting contents. 
-            BeginDragDropTooltip();
+            BeginTooltip();
             if (g.DragDropActive && g.DragDropAcceptIdPrev && (g.DragDropAcceptFlags & ImGuiDragDropFlags_AcceptNoPreviewTooltip))
             {
                 ImGuiWindow* tooltip_window = g.CurrentWindow;
@@ -13547,32 +13565,15 @@ void ImGui::EndDragDropSource()
 {
     ImGuiContext& g = *GImGui;
     IM_ASSERT(g.DragDropActive);
+    IM_ASSERT(g.DragDropWithinSourceOrTarget && "Not after a BeginDragDropSource()?");
 
     if (!(g.DragDropSourceFlags & ImGuiDragDropFlags_SourceNoPreviewTooltip))
-        EndDragDropTooltip();
+        EndTooltip();
 
     // Discard the drag if have not called SetDragDropPayload()
     if (g.DragDropPayload.DataFrameCount == -1)
         ClearDragDrop();
-}
-
-void ImGui::BeginDragDropTooltip()
-{
-    // The default tooltip position is a little offset to give space to see the context menu (it's also clamped within the current viewport/monitor)
-    // In the context of a dragging tooltip we try to reduce that offset and we enforce following the cursor.
-    // Whatever we do we want to call SetNextWindowPos() to enforce a tooltip position and disable clipping the tooltip without our display area, like regular tooltip do.
-    ImGuiContext& g = *GImGui;
-    //ImVec2 tooltip_pos = g.IO.MousePos - g.ActiveIdClickOffset - g.Style.WindowPadding;
-    ImVec2 tooltip_pos = g.IO.MousePos + ImVec2(16 * g.Style.MouseCursorScale, 8 * g.Style.MouseCursorScale);
-    SetNextWindowPos(tooltip_pos);
-    SetNextWindowBgAlpha(g.Style.Colors[ImGuiCol_PopupBg].w * 0.60f);
-    //PushStyleVar(ImGuiStyleVar_Alpha, g.Style.Alpha * 0.60f); // This would be nice but e.g ColorButton with checkboard has issue with transparent colors :(
-    BeginTooltipEx(0, true);
-}
-
-void ImGui::EndDragDropTooltip()
-{
-    EndTooltip();
+    g.DragDropWithinSourceOrTarget = false;
 }
 
 // Use 'cond' to choose to submit payload on drag start or every frame
@@ -13632,8 +13633,10 @@ bool ImGui::BeginDragDropTargetCustom(const ImRect& bb, ImGuiID id)
     if (!IsMouseHoveringRect(bb.Min, bb.Max) || (id == g.DragDropPayload.SourceId))
         return false;
 
+    IM_ASSERT(g.DragDropWithinSourceOrTarget == false);
     g.DragDropTargetRect = bb;
     g.DragDropTargetId = id;
+    g.DragDropWithinSourceOrTarget = true;
     return true;
 }
 
@@ -13660,8 +13663,10 @@ bool ImGui::BeginDragDropTarget()
     if (g.DragDropPayload.SourceId == id)
         return false;
 
+    IM_ASSERT(g.DragDropWithinSourceOrTarget == false);
     g.DragDropTargetRect = display_rect;
     g.DragDropTargetId = id;
+    g.DragDropWithinSourceOrTarget = true;
     return true;
 }
 
@@ -13717,8 +13722,10 @@ const ImGuiPayload* ImGui::AcceptDragDropPayload(const char* type, ImGuiDragDrop
 // 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; (void)g;
+    ImGuiContext& g = *GImGui;
     IM_ASSERT(g.DragDropActive);
+    IM_ASSERT(g.DragDropWithinSourceOrTarget);
+    g.DragDropWithinSourceOrTarget = false;
 }
 
 //-----------------------------------------------------------------------------
@@ -13944,7 +13951,7 @@ void ImGui::ShowMetricsWindow(bool* p_open)
                     (flags & ImGuiWindowFlags_Modal)       ? "Modal " : "", (flags & ImGuiWindowFlags_ChildMenu) ? "ChildMenu " : "", (flags & ImGuiWindowFlags_NoSavedSettings) ? "NoSavedSettings " : "",
                     (flags & ImGuiWindowFlags_AlwaysAutoResize) ? "AlwaysAutoResize" : "");
                 ImGui::BulletText("Scroll: (%.2f/%.2f,%.2f/%.2f)", window->Scroll.x, GetScrollMaxX(window), window->Scroll.y, GetScrollMaxY(window));
-                ImGui::BulletText("Active: %d, WriteAccessed: %d", window->Active, window->WriteAccessed);
+                ImGui::BulletText("Active: %d, WriteAccessed: %d", window->Active || window->WasActive, window->WriteAccessed);
                 ImGui::BulletText("NavLastIds: 0x%08X,0x%08X, NavLayerActiveMask: %X", window->NavLastIds[0], window->NavLastIds[1], window->DC.NavLayerActiveMask);
                 ImGui::BulletText("NavLastChildNavWindow: %s", window->NavLastChildNavWindow ? window->NavLastChildNavWindow->Name : "NULL");
                 if (!window->NavRectRel[0].IsInverted())

imgui_internal.h

@@ -692,6 +692,7 @@ struct ImGuiContext
 
     // Drag and Drop
     bool                    DragDropActive;
+    bool                    DragDropWithinSourceOrTarget;
     ImGuiDragDropFlags      DragDropSourceFlags;
     int                     DragDropMouseButton;
     ImGuiPayload            DragDropPayload;
@@ -810,7 +811,7 @@ struct ImGuiContext
         OverlayDrawList._OwnerName = "##Overlay"; // Give it a name for debugging
         MouseCursor = ImGuiMouseCursor_Arrow;
 
-        DragDropActive = false;
+        DragDropActive = DragDropWithinSourceOrTarget = false;
         DragDropSourceFlags = 0;
         DragDropMouseButton = -1;
         DragDropTargetId = 0;
@@ -1130,8 +1131,6 @@ namespace ImGui
     IMGUI_API bool          BeginDragDropTargetCustom(const ImRect& bb, ImGuiID id);
     IMGUI_API void          ClearDragDrop();
     IMGUI_API bool          IsDragDropPayloadBeingAccepted();
-    IMGUI_API void          BeginDragDropTooltip();
-    IMGUI_API void          EndDragDropTooltip();
 
     // FIXME-WIP: New Columns API
     IMGUI_API void          BeginColumns(const char* str_id, int count, ImGuiColumnsFlags flags = 0); // setup number of columns. use an identifier to distinguish multiple column sets. close with EndColumns().