Added SetItemAllowOverlap() exposed in imgui_internal.h only

imgui.cpp

@@ -1606,7 +1606,7 @@ void ImGui::SetActiveID(ImGuiID id, ImGuiWindow* window = NULL)
 {
     ImGuiState& g = *GImGui;
     g.ActiveId = id;
-    g.ActiveIdAllowHoveringOthers = false;
+    g.ActiveIdAllowOverlap = false;
     g.ActiveIdIsJustActivated = true;
     g.ActiveIdWindow = window;
 }
@@ -1615,7 +1615,7 @@ void ImGui::SetHoveredID(ImGuiID id)
 {
     ImGuiState& g = *GImGui;
     g.HoveredId = id;
-    g.HoveredIdAllowHoveringOthers = false;
+    g.HoveredIdAllowOverlap = false;
 }
 
 void ImGui::KeepAliveID(ImGuiID id)
@@ -1676,7 +1676,7 @@ bool ImGui::ItemAdd(const ImRect& bb, const ImGuiID* id)
         window->DC.LastItemHoveredRect = true;
         window->DC.LastItemHoveredAndUsable = false;
         if (g.HoveredRootWindow == window->RootWindow)
-            if (g.ActiveId == 0 || (id && g.ActiveId == *id) || g.ActiveIdAllowHoveringOthers || (g.ActiveId == window->MoveID))
+            if (g.ActiveId == 0 || (id && g.ActiveId == *id) || g.ActiveIdAllowOverlap || (g.ActiveId == window->MoveID))
                 if (IsWindowContentHoverable(window))
                     window->DC.LastItemHoveredAndUsable = true;
     }
@@ -1705,11 +1705,11 @@ bool ImGui::IsClippedEx(const ImRect& bb, const ImGuiID* id, bool clip_even_when
 bool ImGui::IsHovered(const ImRect& bb, ImGuiID id, bool flatten_childs)
 {
     ImGuiState& g = *GImGui;
-    if (g.HoveredId == 0 || g.HoveredId == id || g.HoveredIdAllowHoveringOthers)
+    if (g.HoveredId == 0 || g.HoveredId == id || g.HoveredIdAllowOverlap)
     {
         ImGuiWindow* window = GetCurrentWindowRead();
         if (g.HoveredWindow == window || (flatten_childs && g.HoveredRootWindow == window->RootWindow))
-            if ((g.ActiveId == 0 || g.ActiveId == id || g.ActiveIdAllowHoveringOthers) && ImGui::IsMouseHoveringRect(bb.Min, bb.Max))
+            if ((g.ActiveId == 0 || g.ActiveId == id || g.ActiveIdAllowOverlap) && ImGui::IsMouseHoveringRect(bb.Min, bb.Max))
                 if (IsWindowContentHoverable(g.HoveredRootWindow))
                     return true;
     }
@@ -1937,7 +1937,7 @@ void ImGui::NewFrame()
     // Clear reference to active widget if the widget isn't alive anymore
     g.HoveredIdPreviousFrame = g.HoveredId;
     g.HoveredId = 0;
-    g.HoveredIdAllowHoveringOthers = false;
+    g.HoveredIdAllowOverlap = false;
     if (!g.ActiveIdIsAlive && g.ActiveIdPreviousFrame == g.ActiveId && g.ActiveId != 0)
         SetActiveID(0);
     g.ActiveIdPreviousFrame = g.ActiveId;
@@ -3027,6 +3027,16 @@ bool ImGui::IsItemVisible()
     return r.Overlaps(window->DC.LastItemRect);
 }
 
+// Allow last item to be overlapped by a subsequent item. Both may be activated during the same frame before the later one takes priority.
+void ImGui::SetItemAllowOverlap()
+{
+    ImGuiState& g = *GImGui;
+    if (g.HoveredId == g.CurrentWindow->DC.LastItemID)
+        g.HoveredIdAllowOverlap = true;
+    if (g.ActiveId == g.CurrentWindow->DC.LastItemID)
+        g.ActiveIdAllowOverlap = true;
+}
+
 ImVec2 ImGui::GetItemRectMin()
 {
     ImGuiWindow* window = GetCurrentWindowRead();
@@ -7279,7 +7289,7 @@ bool ImGui::InputTextEx(const char* label, char* buf, int buf_size, const ImVec2
 
         // Although we are active we don't prevent mouse from hovering other elements unless we are interacting right now with the widget.
         // Down the line we should have a cleaner library-wide concept of Selected vs Active.
-        g.ActiveIdAllowHoveringOthers = !io.MouseDown[0];
+        g.ActiveIdAllowOverlap = !io.MouseDown[0];
 
         // Edit in progress
         const float mouse_x = (g.IO.MousePos.x - frame_bb.Min.x - style.FramePadding.x) + edit_state.ScrollX;

imgui_internal.h

@@ -360,13 +360,13 @@ struct ImGuiState
     ImGuiWindow*            HoveredWindow;                      // Will catch mouse inputs
     ImGuiWindow*            HoveredRootWindow;                  // Will catch mouse inputs (for focus/move only)
     ImGuiID                 HoveredId;                          // Hovered widget
-    bool                    HoveredIdAllowHoveringOthers;
+    bool                    HoveredIdAllowOverlap;
     ImGuiID                 HoveredIdPreviousFrame;
     ImGuiID                 ActiveId;                           // Active widget
     ImGuiID                 ActiveIdPreviousFrame;
     bool                    ActiveIdIsAlive;
     bool                    ActiveIdIsJustActivated;            // Set at the time of activation for one frame
-    bool                    ActiveIdAllowHoveringOthers;        // Set only by active widget
+    bool                    ActiveIdAllowOverlap;               // Set only by active widget
     ImGuiWindow*            ActiveIdWindow;
     ImGuiWindow*            MovedWindow;                        // Track the child window we clicked on to move a window. Pointer is only valid if ActiveID is the "#MOVE" identifier of a window.
     ImVector<ImGuiIniData>  Settings;                           // .ini Settings
@@ -445,13 +445,13 @@ struct ImGuiState
         HoveredWindow = NULL;
         HoveredRootWindow = NULL;
         HoveredId = 0;
-        HoveredIdAllowHoveringOthers = false;
+        HoveredIdAllowOverlap = false;
         HoveredIdPreviousFrame = 0;
         ActiveId = 0;
         ActiveIdPreviousFrame = 0;
         ActiveIdIsAlive = false;
         ActiveIdIsJustActivated = false;
-        ActiveIdAllowHoveringOthers = false;
+        ActiveIdAllowOverlap = false;
         ActiveIdWindow = NULL;
         MovedWindow = NULL;
         SettingsDirtyTimer = 0.0f;
@@ -683,6 +683,7 @@ namespace ImGui
     IMGUI_API void          FocusableItemUnregister(ImGuiWindow* window);
     IMGUI_API ImVec2        CalcItemSize(ImVec2 size, float default_x, float default_y);
     IMGUI_API float         CalcWrapWidthForPos(const ImVec2& pos, float wrap_pos_x);
+    IMGUI_API void          SetItemAllowOverlap();      // Allow last item to be overlapped by a subsequent item
 
     // NB: All position are in absolute pixels coordinates (not window coordinates)
     IMGUI_API void          RenderText(ImVec2 pos, const char* text, const char* text_end = NULL, bool hide_text_after_hash = true);