Columns: Refactor: Moved ColumnsSet[] to window out of DC as they are persistent data for most + fix for pre C++11 compilers. (#125, #1499)

imgui.cpp

@@ -10935,12 +10935,12 @@ void ImGui::PushColumnClipRect(int column_index)
 
 static ImGuiColumnsSet* FindOrAddColumnsSet(ImGuiWindow* window, ImGuiID id)
 {
-    for (int n = 0; n < window->DC.ColumnsSets.Size; n++)
+    for (int n = 0; n < window->ColumnsStorage.Size; n++)
-        if (window->DC.ColumnsSets[n].ID == id)
+        if (window->ColumnsStorage[n].ID == id)
-            return &window->DC.ColumnsSets[n];
+            return &window->ColumnsStorage[n];
 
-    window->DC.ColumnsSets.push_back(ImGuiColumnsSet());
+    window->ColumnsStorage.push_back(ImGuiColumnsSet());
-    ImGuiColumnsSet* columns = &window->DC.ColumnsSets.back();
+    ImGuiColumnsSet* columns = &window->ColumnsStorage.back();
     columns->ID = id;
     return columns;
 }

imgui_internal.h

@@ -201,7 +201,7 @@ enum ImGuiColumnsFlags_
     ImGuiColumnsFlags_NoResize              = 1 << 1,   // Disable resizing columns when clicking on the dividers
     ImGuiColumnsFlags_NoPreserveWidths      = 1 << 2,   // Disable column width preservation when adjusting columns
     ImGuiColumnsFlags_NoForceWithinWindow   = 1 << 3,   // Disable forcing columns to fit within window
-    ImGuiColumnsFlags_GrowParentContentsSize= 1 << 4,   // (WIP) Restore pre-1.51 behavior of extending the parent window contents size but _without affecting the columns width at all_. Will eventually remove.
+    ImGuiColumnsFlags_GrowParentContentsSize= 1 << 4    // (WIP) Restore pre-1.51 behavior of extending the parent window contents size but _without affecting the columns width at all_. Will eventually remove.
 };
 
 enum ImGuiSelectableFlagsPrivate_
@@ -701,8 +701,7 @@ struct IMGUI_API ImGuiDrawContext
     float                   IndentX;                // Indentation / start position from left of window (increased by TreePush/TreePop, etc.)
     float                   GroupOffsetX;
     float                   ColumnsOffsetX;         // Offset to the current column (if ColumnsCurrent > 0). FIXME: This and the above should be a stack to allow use cases like Tree->Column->Tree. Need revamp columns API.
-    ImGuiColumnsSet*          ColumnsSet;
+    ImGuiColumnsSet*        ColumnsSet;             // Current columns set
-    ImVector<ImGuiColumnsSet> ColumnsSets;
 
     ImGuiDrawContext()
     {
@@ -784,6 +783,7 @@ struct IMGUI_API ImGuiWindow
     float                   ItemWidthDefault;
     ImGuiSimpleColumns      MenuColumns;                        // Simplified columns storage for menu items
     ImGuiStorage            StateStorage;
+    ImVector<ImGuiColumnsSet> ColumnsStorage;
     float                   FontWindowScale;                    // Scale multiplier per-window
     ImDrawList*             DrawList;
     ImGuiWindow*            ParentWindow;                       // If we are a child _or_ popup window, this is pointing to our parent. Otherwise NULL.