Tables: fixed angled headers with frozen columns.

imgui_demo.cpp

@@ -5201,12 +5201,14 @@ static void ShowDemoWindowTables()
 
         static ImGuiTableFlags table_flags = ImGuiTableFlags_SizingFixedFit | ImGuiTableFlags_ScrollX | ImGuiTableFlags_ScrollY | ImGuiTableFlags_BordersOuter | ImGuiTableFlags_BordersInnerH | ImGuiTableFlags_Hideable | ImGuiTableFlags_Resizable | ImGuiTableFlags_Reorderable | ImGuiTableFlags_HighlightHoveredColumn;
         static bool bools[columns_count * rows_count] = {}; // Dummy storage selection storage
+        static int frozen_cols = 1;
         static int frozen_rows = 2;
         ImGui::CheckboxFlags("_ScrollX", &table_flags, ImGuiTableFlags_ScrollX);
         ImGui::CheckboxFlags("_ScrollY", &table_flags, ImGuiTableFlags_ScrollY);
         ImGui::CheckboxFlags("_NoBordersInBody", &table_flags, ImGuiTableFlags_NoBordersInBody);
         ImGui::CheckboxFlags("_HighlightHoveredColumn", &table_flags, ImGuiTableFlags_HighlightHoveredColumn);
         ImGui::SetNextItemWidth(ImGui::GetFontSize() * 8);
+        ImGui::SliderInt("Frozen columns", &frozen_cols, 0, 2);
         ImGui::SliderInt("Frozen rows", &frozen_rows, 0, 2);
 
         if (ImGui::BeginTable("table_angled_headers", columns_count, table_flags, ImVec2(0.0f, TEXT_BASE_HEIGHT * 12)))
@@ -5214,7 +5216,7 @@ static void ShowDemoWindowTables()
             ImGui::TableSetupColumn(column_names[0], ImGuiTableColumnFlags_NoHide | ImGuiTableColumnFlags_NoReorder);
             for (int n = 1; n < columns_count; n++)
                 ImGui::TableSetupColumn(column_names[n], ImGuiTableColumnFlags_AngledHeader | ImGuiTableColumnFlags_WidthFixed);
-            ImGui::TableSetupScrollFreeze(0, frozen_rows);
+            ImGui::TableSetupScrollFreeze(frozen_cols, frozen_rows);
 
             ImGui::TableAngledHeadersRow(); // Draw angled headers for all columns with the ImGuiTableColumnFlags_AngledHeader flag.
             ImGui::TableHeadersRow();       // Draw remaining headers and allow access to context-menu and other functions.

imgui_tables.cpp

@@ -3166,9 +3166,13 @@ void ImGui::TableAngledHeadersRowEx(float angle, float max_label_width)
     TableNextRow(ImGuiTableRowFlags_Headers, row_height);
     TableNextColumn();
     table->DrawSplitter->SetCurrentChannel(draw_list, TABLE_DRAW_CHANNEL_BG0);
-    PushClipRect(table->BgClipRect.Min, table->BgClipRect.Max, false); // Span all columns
+    float clip_rect_min_x = table->BgClipRect.Min.x;
+    if (table->FreezeColumnsCount > 0)
+        clip_rect_min_x = ImMax(clip_rect_min_x, table->Columns[table->FreezeColumnsCount - 1].MaxX);
     TableSetBgColor(ImGuiTableBgTarget_RowBg0, 0); // Cancel
+    PushClipRect(table->BgClipRect.Min, table->BgClipRect.Max, false); // Span all columns
     draw_list->AddRectFilled(table->BgClipRect.Min, table->BgClipRect.Max, GetColorU32(ImGuiCol_TableHeaderBg, 0.25f)); // FIXME-STYLE: Change row background with an arbitrary color.
+    PushClipRect(ImVec2(clip_rect_min_x, table->BgClipRect.Min.y), table->BgClipRect.Max, true); // Span all columns
 
     const ImRect row_r(table->WorkRect.Min.x, table->BgClipRect.Min.y, table->WorkRect.Max.x, window->DC.CursorPos.y + row_height);
     const ImGuiID row_id = GetID("##AngledHeaders");
@@ -3230,6 +3234,7 @@ void ImGui::TableAngledHeadersRowEx(float angle, float max_label_width)
             }
         }
     PopClipRect();
+    PopClipRect();
     table->TempData->AngledheadersExtraWidth = ImMax(0.0f, max_x - table->Columns[table->RightMostEnabledColumn].MaxX);
 }