Columns: Added internal tracking of a few flag temporarily, to facilitate the work of third-parties who have columns patches. (#125)

imgui.cpp

@@ -10979,6 +10979,7 @@ void ImGui::BeginColumns(const char* str_id, int columns_count, ImGuiColumnsFlag
     window->DC.CursorPos.x = (float)(int)(window->Pos.x + window->DC.IndentX + window->DC.ColumnsOffsetX);
 
     // Initialize defaults
+    columns->IsFirstFrame = (columns->Columns.Size == 0);
     if (columns->Columns.Size == 0)
     {
         columns->Columns.reserve(columns_count + 1);
@@ -11032,6 +11033,7 @@ void ImGui::EndColumns()
         window->DC.CursorMaxPos.x = ImMax(columns->StartMaxPosX, columns->MaxX);  // Restore cursor max pos, as columns don't grow parent
 
     // Draw columns borders and handle resize
+    columns->IsBeingResized = false;
     if (!(columns->Flags & ImGuiColumnsFlags_NoBorder) && !window->SkipItems)
     {
         const float y1 = columns->StartPosY;
@@ -11070,6 +11072,7 @@ void ImGui::EndColumns()
         {
             float x = GetDraggedColumnOffset(columns, dragging_column);
             SetColumnOffset(dragging_column, x);
+            columns->IsBeingResized = true;
         }
     }
 

imgui_internal.h

@@ -424,6 +424,8 @@ struct ImGuiColumnsSet
 {
     ImGuiID             ID;
     ImGuiColumnsFlags   Flags;
+    bool                IsFirstFrame;
+    bool                IsBeingResized;
     int                 Current;
     int                 Count;
     float               MinX, MaxX;
@@ -437,6 +439,8 @@ struct ImGuiColumnsSet
     {
         ID = 0;
         Flags = 0;
+        IsFirstFrame = false;
+        IsBeingResized = false;
         Current = 0;
         Count = 1;
         MinX = MaxX = 0.0f;