Overlap: Internals: add NextItemData.ItemFlags to facilitate implemen…

…tation of SetNextItemAllowOverlap() + potentially remove extra_flags from ItemAdd(). (#6512, #3909)

imgui.cpp

@@ -9438,7 +9438,7 @@ bool ImGui::ItemAdd(const ImRect& bb, ImGuiID id, const ImRect* nav_bb_arg, ImGu
     g.LastItemData.ID = id;
     g.LastItemData.Rect = bb;
     g.LastItemData.NavRect = nav_bb_arg ? *nav_bb_arg : bb;
-    g.LastItemData.InFlags = g.CurrentItemFlags | extra_flags;
+    g.LastItemData.InFlags = g.CurrentItemFlags | g.NextItemData.ItemFlags | extra_flags;
     g.LastItemData.StatusFlags = ImGuiItemStatusFlags_None;
 
     // Directional navigation processing
@@ -9470,6 +9470,7 @@ bool ImGui::ItemAdd(const ImRect& bb, ImGuiID id, const ImRect* nav_bb_arg, ImGu
         IM_ASSERT(id != window->ID && "Cannot have an empty ID at the root of a window. If you need an empty label, use ## and read the FAQ about how the ID Stack works!");
     }
     g.NextItemData.Flags = ImGuiNextItemDataFlags_None;
+    g.NextItemData.ItemFlags = ImGuiItemFlags_None;
 
 #ifdef IMGUI_ENABLE_TEST_ENGINE
     if (id != 0)

imgui.h

@@ -1294,7 +1294,7 @@ enum ImGuiHoveredFlags_
     ImGuiHoveredFlags_AllowWhenBlockedByPopup       = 1 << 5,   // Return true even if a popup window is normally blocking access to this item/window
     //ImGuiHoveredFlags_AllowWhenBlockedByModal     = 1 << 6,   // Return true even if a modal popup window is normally blocking access to this item/window. FIXME-TODO: Unavailable yet.
     ImGuiHoveredFlags_AllowWhenBlockedByActiveItem  = 1 << 7,   // Return true even if an active item is blocking access to this item/window. Useful for Drag and Drop patterns.
-    ImGuiHoveredFlags_AllowWhenOverlapped           = 1 << 8,   // IsItemHovered() only: Return true even if the position is obstructed or overlapped by another window
+    ImGuiHoveredFlags_AllowWhenOverlapped           = 1 << 8,   // IsItemHovered() only: Return true even if the position is obstructed or overlapped by another WINDOW.
     ImGuiHoveredFlags_AllowWhenDisabled             = 1 << 9,   // IsItemHovered() only: Return true even if the item is disabled
     ImGuiHoveredFlags_NoNavOverride                 = 1 << 10,  // IsItemHovered() only: Disable using gamepad/keyboard navigation state when active, always query mouse
     ImGuiHoveredFlags_RectOnly                      = ImGuiHoveredFlags_AllowWhenBlockedByPopup | ImGuiHoveredFlags_AllowWhenBlockedByActiveItem | ImGuiHoveredFlags_AllowWhenOverlapped,

imgui_internal.h

@@ -1179,13 +1179,14 @@ enum ImGuiNextItemDataFlags_
 struct ImGuiNextItemData
 {
     ImGuiNextItemDataFlags      Flags;
+    ImGuiItemFlags              ItemFlags;
     float                       Width;          // Set by SetNextItemWidth()
     ImGuiID                     FocusScopeId;   // Set by SetNextItemMultiSelectData() (!= 0 signify value has been set, so it's an alternate version of HasSelectionData, we don't use Flags for this because they are cleared too early. This is mostly used for debugging)
     ImGuiCond                   OpenCond;
     bool                        OpenVal;        // Set by SetNextItemOpen()
 
     ImGuiNextItemData()         { memset(this, 0, sizeof(*this)); }
-    inline void ClearFlags()    { Flags = ImGuiNextItemDataFlags_None; } // Also cleared manually by ItemAdd()!
+    inline void ClearFlags()    { Flags = ImGuiNextItemDataFlags_None; ItemFlags = ImGuiItemFlags_None; } // Also cleared manually by ItemAdd()!
 };
 
 // Status storage for the last submitted item

imgui_widgets.cpp

@@ -1163,10 +1163,8 @@ bool ImGui::CheckboxFlagsT(const char* label, T* flags, T flags_value)
     if (!all_on && any_on)
     {
         ImGuiContext& g = *GImGui;
-        ImGuiItemFlags backup_item_flags = g.CurrentItemFlags;
-        g.CurrentItemFlags |= ImGuiItemFlags_MixedValue;
+        g.NextItemData.ItemFlags |= ImGuiItemFlags_MixedValue;
         pressed = Checkbox(label, &all_on);
-        g.CurrentItemFlags = backup_item_flags;
     }
     else
     {
@@ -4959,11 +4957,9 @@ bool ImGui::InputTextEx(const char* label, const char* hint, char* buf, int buf_
     {
         // For focus requests to work on our multiline we need to ensure our child ItemAdd() call specifies the ImGuiItemFlags_Inputable (ref issue #4761)...
         Dummy(ImVec2(text_size.x, text_size.y + style.FramePadding.y));
-        ImGuiItemFlags backup_item_flags = g.CurrentItemFlags;
-        g.CurrentItemFlags |= ImGuiItemFlags_Inputable | ImGuiItemFlags_NoTabStop;
+        g.NextItemData.ItemFlags |= ImGuiItemFlags_Inputable | ImGuiItemFlags_NoTabStop;
         EndChild();
         item_data_backup.StatusFlags |= (g.LastItemData.StatusFlags & ImGuiItemStatusFlags_HoveredWindow);
-        g.CurrentItemFlags = backup_item_flags;
 
         // ...and then we need to undo the group overriding last item data, which gets a bit messy as EndGroup() tries to forward scrollbar being active...
         // FIXME: This quite messy/tricky, should attempt to get rid of the child window.