Merge branch 'master' into docking

# Conflicts:
#	imgui.cpp
#	imgui_demo.cpp

docs/CHANGELOG.txt

@@ -114,6 +114,7 @@ Other Changes:
 - GetMouseDragDelta(): verify that mouse positions are valid otherwise returns zero.
 - Inputs: Also add support for horizontal scroll with Shift+Mouse Wheel. (#2424, #1463) [@LucaRood]
 - PlotLines, PlotHistogram: Ignore NaN values when calculating min/max bounds. (#2485)
+- Window: Window close button is horizontally aligned with style.FramePadding.x.
 - Misc: Added IM_MALLOC/IM_FREE macros mimicking IM_NEW/IM_DELETE so user doesn't need to revert
   to using the ImGui::MemAlloc()/MemFree() calls directly.
 - Examples: OpenGL: Added a dummy GL call + comments in ImGui_ImplOpenGL3_Init() to detect uninitialized
@@ -125,6 +126,7 @@ Other Changes:
 - Examples: Vulkan: Avoid passing negative coordinates to vkCmdSetScissor, which debug validation layers do not like.
 - Examples: Vulkan: Added ImGui_ImplVulkan_SetMinImageCount() to change min image count at runtime. (#2071) [@nathanvoglsam]
 - Examples: DirectX9: Fixed erroneous assert in ImGui_ImplDX9_InvalidateDeviceObjects(). (#2454)
+- Examples: DirectX10/11/12, Allegro, Marmalade: Render functions early out when display size is zero (minimized). (#2496)
 - Examples: GLUT: Fixed existing FreeGLUT example to work with regular GLUT. (#2465) [@andrewwillmott]
 - Examples: GLUT: Renamed imgui_impl_freeglut.cpp/.h to imgui_impl_glut.cpp/.h. (#2465) [@andrewwillmott]
 - Examples: GLUT: Made io.DeltaTime always > 0. (#2430)

examples/.gitignore

@@ -25,6 +25,7 @@ project.xcworkspace
 xcuserdata
 
 ## Emscripten output
+*.o.tmp
 *.out.js
 *.out.wasm
 example_emscripten/example_emscripten.*

examples/example_emscripten/Makefile

@@ -24,10 +24,12 @@ UNAME_S := $(shell uname -s)
 EMS = -s USE_SDL=2 -s WASM=1
 EMS += -s ALLOW_MEMORY_GROWTH=1 -s BINARYEN_TRAP_MODE=clamp
 EMS += -s DISABLE_EXCEPTION_CATCHING=1 -s NO_EXIT_RUNTIME=0
-EMS += -s ASSERTIONS=1 -s SAFE_HEAP=1
+EMS += -s ASSERTIONS=1 -s NO_FILESYSTEM=1
+#EMS += -s SAFE_HEAP=1    ## Adds overhead
 
 CPPFLAGS = -I../ -I../../
-CPPFLAGS += -g -Wall -Wformat -O3
+#CPPFLAGS += -g
+CPPFLAGS += -Wall -Wformat -Os
 CPPFLAGS += $(EMS)
 LIBS = $(EMS)
 LDFLAGS = --shell-file shell_minimal.html

examples/example_emscripten/main.cpp

@@ -63,6 +63,10 @@ int main(int, char**)
     ImGuiIO& io = ImGui::GetIO(); (void)io;
     //io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;  // Enable Keyboard Controls
 
+    // For an Emscripten build we are disabling file-system access, so let's not attempt to do a fopen() of the imgui.ini file.
+    // You may manually call LoadIniSettingsFromMemory() to load settings from your own storage.
+    io.IniFilename = NULL;
+
     // Setup Dear ImGui style
     ImGui::StyleColorsDark();
     //ImGui::StyleColorsClassic();

examples/imgui_impl_allegro5.cpp

@@ -64,6 +64,10 @@ struct ImDrawVertAllegro
 // (this used to be set in io.RenderDrawListsFn and called by ImGui::Render(), but you can now call this directly from your main loop)
 void ImGui_ImplAllegro5_RenderDrawData(ImDrawData* draw_data)
 {
+    // Avoid rendering when minimized
+    if (draw_data->DisplaySize.x <= 0.0f || draw_data->DisplaySize.y <= 0.0f)
+        return;
+
     // Backup Allegro state that will be modified
     ALLEGRO_TRANSFORM last_transform = *al_get_current_transform();
     ALLEGRO_TRANSFORM last_projection_transform = *al_get_current_projection_transform();

examples/imgui_impl_dx10.cpp

@@ -65,6 +65,10 @@ static void ImGui_ImplDX10_ShutdownPlatformInterface();
 // (this used to be set in io.RenderDrawListsFn and called by ImGui::Render(), but you can now call this directly from your main loop)
 void ImGui_ImplDX10_RenderDrawData(ImDrawData* draw_data)
 {
+    // Avoid rendering when minimized
+    if (draw_data->DisplaySize.x <= 0.0f || draw_data->DisplaySize.y <= 0.0f)
+        return;
+
     ID3D10Device* ctx = g_pd3dDevice;
 
     // Create and grow vertex/index buffers if needed

examples/imgui_impl_dx11.cpp

@@ -65,6 +65,10 @@ static void ImGui_ImplDX11_ShutdownPlatformInterface();
 // (this used to be set in io.RenderDrawListsFn and called by ImGui::Render(), but you can now call this directly from your main loop)
 void ImGui_ImplDX11_RenderDrawData(ImDrawData* draw_data)
 {
+    // Avoid rendering when minimized
+    if (draw_data->DisplaySize.x <= 0.0f || draw_data->DisplaySize.y <= 0.0f)
+        return;
+
     ID3D11DeviceContext* ctx = g_pd3dDeviceContext;
 
     // Create and grow vertex/index buffers if needed

examples/imgui_impl_dx12.cpp

@@ -66,6 +66,10 @@ static void ImGui_ImplDX12_ShutdownPlatformInterface();
 // (this used to be set in io.RenderDrawListsFn and called by ImGui::Render(), but you can now call this directly from your main loop)
 void ImGui_ImplDX12_RenderDrawData(ImDrawData* draw_data, ID3D12GraphicsCommandList* ctx)
 {
+    // Avoid rendering when minimized
+    if (draw_data->DisplaySize.x <= 0.0f || draw_data->DisplaySize.y <= 0.0f)
+        return;
+
     // FIXME: I'm assuming that this only gets called once per frame!
     // If not, we can't just re-allocate the IB or VB, we'll have to do a proper allocator.
     g_frameIndex = g_frameIndex + 1;

examples/imgui_impl_marmalade.cpp

@@ -40,6 +40,10 @@ static ImVec2       g_RenderScale = ImVec2(1.0f,1.0f);
 // (this used to be set in io.RenderDrawListsFn and called by ImGui::Render(), but you can now call this directly from your main loop)
 void ImGui_Marmalade_RenderDrawData(ImDrawData* draw_data)
 {
+    // Avoid rendering when minimized
+    if (draw_data->DisplaySize.x <= 0.0f || draw_data->DisplaySize.y <= 0.0f)
+        return;
+
     // Render command lists
     for (int n = 0; n < draw_data->CmdListsCount; n++)
     {

imgui.cpp

@@ -925,7 +925,7 @@ CODE
       (The ImGuiWindowFlags_NoDecoration flag itself is a shortcut for NoTitleBar | NoResize | NoScrollbar | NoCollapse)
       Then you can retrieve the ImDrawList* via GetWindowDrawList() and draw to it in any way you like.
     - You can call ImGui::GetBackgroundDrawList() or ImGui::GetForegroundDrawList() and use those draw list to display
-      contents behind or over every other imgui windows. (1 bg/fg drawlist per viewport)
+      contents behind or over every other imgui windows (one bg/fg drawlist per viewport).
     - You can create your own ImDrawList instance. You'll need to initialize them ImGui::GetDrawListSharedData(), or create
       your own ImDrawListSharedData, and then call your rendered code with your own ImDrawList or ImDrawData data.
 
@@ -2277,8 +2277,8 @@ static void SetCursorPosYAndSetupDummyPrevLine(float pos_y, float line_height)
     ImGuiWindow* window = ImGui::GetCurrentWindow();
     window->DC.CursorPosPrevLine.y = window->DC.CursorPos.y - line_height;      // Setting those fields so that SetScrollHereY() can properly function after the end of our clipper usage.
     window->DC.PrevLineSize.y = (line_height - GImGui->Style.ItemSpacing.y);    // If we end up needing more accurate data (to e.g. use SameLine) we may as well make the clipper have a fourth step to let user process and display the last item in their list.
-    if (window->DC.ColumnsSet)
-        window->DC.ColumnsSet->LineMinY = window->DC.CursorPos.y;           // Setting this so that cell Y position are set properly
+    if (window->DC.CurrentColumns)
+        window->DC.CurrentColumns->LineMinY = window->DC.CursorPos.y;           // Setting this so that cell Y position are set properly
 }
 
 // Use case A: Begin() called from constructor with items_height<0, then called again from Sync() in StepNo 1
@@ -2654,7 +2654,7 @@ ImGuiWindow::~ImGuiWindow()
     IM_ASSERT(DrawList == &DrawListInst);
     IM_DELETE(Name);
     for (int i = 0; i != ColumnsStorage.Size; i++)
-        ColumnsStorage[i].~ImGuiColumnsSet();
+        ColumnsStorage[i].~ImGuiColumns();
 }
 
 ImGuiID ImGuiWindow::GetID(const char* str, const char* str_end)
@@ -5957,7 +5957,7 @@ bool ImGui::Begin(const char* name, bool* p_open, ImGuiWindowFlags flags)
         window->DC.ItemFlagsStack.resize(0);
         window->DC.ItemWidthStack.resize(0);
         window->DC.TextWrapPosStack.resize(0);
-        window->DC.ColumnsSet = NULL;
+        window->DC.CurrentColumns = NULL;
         window->DC.TreeDepth = 0;
         window->DC.TreeDepthMayJumpToParentOnPop = 0x00;
         window->DC.StateStorage = &window->StateStorage;
@@ -6093,7 +6093,7 @@ bool ImGui::Begin(const char* name, bool* p_open, ImGuiWindowFlags flags)
                         BeginAsDockableDragDropTarget(window);
         }
 
-        // We fill last item data based on Title Bar or Tab, in order for IsItemHovered() and IsItemActive() to be usable after Begin().
+        // We fill last item data based on Title Bar/Tab, in order for IsItemHovered() and IsItemActive() to be usable after Begin().
         // This is useful to allow creating context menus on title bar only, etc.
         if (window->DockIsActive)
         {
@@ -6202,7 +6202,7 @@ void ImGui::End()
 
     ImGuiWindow* window = g.CurrentWindow;
 
-    if (window->DC.ColumnsSet != NULL)
+    if (window->DC.CurrentColumns != NULL)
         EndColumns();
     if (!(window->Flags & ImGuiWindowFlags_DockNodeHost))   // Pop inner window clip rectangle
         PopClipRect();
@@ -6991,8 +6991,8 @@ ImVec2 ImGui::GetContentRegionMax()
 {
     ImGuiWindow* window = GetCurrentWindowRead();
     ImVec2 mx = window->ContentsRegionRect.Max - window->Pos;
-    if (window->DC.ColumnsSet)
-        mx.x = GetColumnOffset(window->DC.ColumnsSet->Current + 1) - window->WindowPadding.x;
+    if (window->DC.CurrentColumns)
+        mx.x = GetColumnOffset(window->DC.CurrentColumns->Current + 1) - window->WindowPadding.x;
     return mx;
 }
 
@@ -8973,11 +8973,11 @@ void ImGui::NavUpdateWindowingList()
 void ImGui::NextColumn()
 {
     ImGuiWindow* window = GetCurrentWindow();
-    if (window->SkipItems || window->DC.ColumnsSet == NULL)
+    if (window->SkipItems || window->DC.CurrentColumns == NULL)
         return;
 
     ImGuiContext& g = *GImGui;
-    ImGuiColumnsSet* columns = window->DC.ColumnsSet;
+    ImGuiColumns* columns = window->DC.CurrentColumns;
 
     if (columns->Count == 1)
     {
@@ -9016,28 +9016,28 @@ void ImGui::NextColumn()
 int ImGui::GetColumnIndex()
 {
     ImGuiWindow* window = GetCurrentWindowRead();
-    return window->DC.ColumnsSet ? window->DC.ColumnsSet->Current : 0;
+    return window->DC.CurrentColumns ? window->DC.CurrentColumns->Current : 0;
 }
 
 int ImGui::GetColumnsCount()
 {
     ImGuiWindow* window = GetCurrentWindowRead();
-    return window->DC.ColumnsSet ? window->DC.ColumnsSet->Count : 1;
+    return window->DC.CurrentColumns ? window->DC.CurrentColumns->Count : 1;
 }
 
-static float OffsetNormToPixels(const ImGuiColumnsSet* columns, float offset_norm)
+static float OffsetNormToPixels(const ImGuiColumns* columns, float offset_norm)
 {
     return offset_norm * (columns->MaxX - columns->MinX);
 }
 
-static float PixelsToOffsetNorm(const ImGuiColumnsSet* columns, float offset)
+static float PixelsToOffsetNorm(const ImGuiColumns* columns, float offset)
 {
     return offset / (columns->MaxX - columns->MinX);
 }
 
 static inline float GetColumnsRectHalfWidth() { return 4.0f; }
 
-static float GetDraggedColumnOffset(ImGuiColumnsSet* columns, int column_index)
+static float GetDraggedColumnOffset(ImGuiColumns* columns, int column_index)
 {
     // Active (dragged) column always follow mouse. The reason we need this is that dragging a column to the right edge of an auto-resizing
     // window creates a feedback loop because we store normalized positions. So while dragging we enforce absolute positioning.
@@ -9057,7 +9057,7 @@ static float GetDraggedColumnOffset(ImGuiColumnsSet* columns, int column_index)
 float ImGui::GetColumnOffset(int column_index)
 {
     ImGuiWindow* window = GetCurrentWindowRead();
-    ImGuiColumnsSet* columns = window->DC.ColumnsSet;
+    ImGuiColumns* columns = window->DC.CurrentColumns;
     IM_ASSERT(columns != NULL);
 
     if (column_index < 0)
@@ -9069,7 +9069,7 @@ float ImGui::GetColumnOffset(int column_index)
     return x_offset;
 }
 
-static float GetColumnWidthEx(ImGuiColumnsSet* columns, int column_index, bool before_resize = false)
+static float GetColumnWidthEx(ImGuiColumns* columns, int column_index, bool before_resize = false)
 {
     if (column_index < 0)
         column_index = columns->Current;
@@ -9085,7 +9085,7 @@ static float GetColumnWidthEx(ImGuiColumnsSet* columns, int column_index, bool b
 float ImGui::GetColumnWidth(int column_index)
 {
     ImGuiWindow* window = GetCurrentWindowRead();
-    ImGuiColumnsSet* columns = window->DC.ColumnsSet;
+    ImGuiColumns* columns = window->DC.CurrentColumns;
     IM_ASSERT(columns != NULL);
 
     if (column_index < 0)
@@ -9097,7 +9097,7 @@ void ImGui::SetColumnOffset(int column_index, float offset)
 {
     ImGuiContext& g = *GImGui;
     ImGuiWindow* window = g.CurrentWindow;
-    ImGuiColumnsSet* columns = window->DC.ColumnsSet;
+    ImGuiColumns* columns = window->DC.CurrentColumns;
     IM_ASSERT(columns != NULL);
 
     if (column_index < 0)
@@ -9118,7 +9118,7 @@ void ImGui::SetColumnOffset(int column_index, float offset)
 void ImGui::SetColumnWidth(int column_index, float width)
 {
     ImGuiWindow* window = GetCurrentWindowRead();
-    ImGuiColumnsSet* columns = window->DC.ColumnsSet;
+    ImGuiColumns* columns = window->DC.CurrentColumns;
     IM_ASSERT(columns != NULL);
 
     if (column_index < 0)
@@ -9129,46 +9129,57 @@ void ImGui::SetColumnWidth(int column_index, float width)
 void ImGui::PushColumnClipRect(int column_index)
 {
     ImGuiWindow* window = GetCurrentWindowRead();
-    ImGuiColumnsSet* columns = window->DC.ColumnsSet;
+    ImGuiColumns* columns = window->DC.CurrentColumns;
     if (column_index < 0)
         column_index = columns->Current;
 
-    PushClipRect(columns->Columns[column_index].ClipRect.Min, columns->Columns[column_index].ClipRect.Max, false);
+    ImGuiColumnData* column = &columns->Columns[column_index];
+    PushClipRect(column->ClipRect.Min, column->ClipRect.Max, false);
 }
 
-static ImGuiColumnsSet* FindOrAddColumnsSet(ImGuiWindow* window, ImGuiID id)
+ImGuiColumns* ImGui::FindOrCreateColumns(ImGuiWindow* window, ImGuiID id)
 {
+    // We have few columns per window so for now we don't need bother much with turning this into a faster lookup.
     for (int n = 0; n < window->ColumnsStorage.Size; n++)
         if (window->ColumnsStorage[n].ID == id)
             return &window->ColumnsStorage[n];
 
-    window->ColumnsStorage.push_back(ImGuiColumnsSet());
-    ImGuiColumnsSet* columns = &window->ColumnsStorage.back();
+    window->ColumnsStorage.push_back(ImGuiColumns());
+    ImGuiColumns* columns = &window->ColumnsStorage.back();
     columns->ID = id;
     return columns;
 }
 
-void ImGui::BeginColumns(const char* str_id, int columns_count, ImGuiColumnsFlags flags)
+ImGuiID ImGui::GetColumnsID(const char* str_id, int columns_count)
 {
-    ImGuiContext& g = *GImGui;
     ImGuiWindow* window = GetCurrentWindow();
 
-    IM_ASSERT(columns_count >= 1);
-    IM_ASSERT(window->DC.ColumnsSet == NULL); // Nested columns are currently not supported
-
     // Differentiate column ID with an arbitrary prefix for cases where users name their columns set the same as another widget.
     // In addition, when an identifier isn't explicitly provided we include the number of columns in the hash to make it uniquer.
     PushID(0x11223347 + (str_id ? 0 : columns_count));
     ImGuiID id = window->GetID(str_id ? str_id : "columns");
     PopID();
 
+    return id;
+}
+
+void ImGui::BeginColumns(const char* str_id, int columns_count, ImGuiColumnsFlags flags)
+{
+    ImGuiContext& g = *GImGui;
+    ImGuiWindow* window = GetCurrentWindow();
+
+    IM_ASSERT(columns_count >= 1);
+    IM_ASSERT(window->DC.CurrentColumns == NULL); // Nested columns are currently not supported
+
+    ImGuiID id = GetColumnsID(str_id, columns_count);
+
     // Acquire storage for the columns set
-    ImGuiColumnsSet* columns = FindOrAddColumnsSet(window, id);
+    ImGuiColumns* columns = FindOrCreateColumns(window, id);
     IM_ASSERT(columns->ID == id);
     columns->Current = 0;
     columns->Count = columns_count;
     columns->Flags = flags;
-    window->DC.ColumnsSet = columns;
+    window->DC.CurrentColumns = columns;
 
     // Set state for first column
     const float content_region_width = (window->SizeContentsExplicit.x != 0.0f) ? (window->SizeContentsExplicit.x) : (window->InnerClipRect.Max.x - window->Pos.x);
@@ -9219,7 +9230,7 @@ void ImGui::EndColumns()
 {
     ImGuiContext& g = *GImGui;
     ImGuiWindow* window = GetCurrentWindow();
-    ImGuiColumnsSet* columns = window->DC.ColumnsSet;
+    ImGuiColumns* columns = window->DC.CurrentColumns;
     IM_ASSERT(columns != NULL);
 
     PopItemWidth();
@@ -9280,7 +9291,7 @@ void ImGui::EndColumns()
     }
     columns->IsBeingResized = is_being_resized;
 
-    window->DC.ColumnsSet = NULL;
+    window->DC.CurrentColumns = NULL;
     window->DC.ColumnsOffset.x = 0.0f;
     window->DC.CursorPos.x = (float)(int)(window->Pos.x + window->DC.Indent.x + window->DC.ColumnsOffset.x);
 }
@@ -9293,10 +9304,10 @@ void ImGui::Columns(int columns_count, const char* id, bool border)
 
     ImGuiColumnsFlags flags = (border ? 0 : ImGuiColumnsFlags_NoBorder);
     //flags |= ImGuiColumnsFlags_NoPreserveWidths; // NB: Legacy behavior
-    if (window->DC.ColumnsSet != NULL && window->DC.ColumnsSet->Count == columns_count && window->DC.ColumnsSet->Flags == flags)
+    if (window->DC.CurrentColumns != NULL && window->DC.CurrentColumns->Count == columns_count && window->DC.CurrentColumns->Flags == flags)
         return;
 
-    if (window->DC.ColumnsSet != NULL)
+    if (window->DC.CurrentColumns != NULL)
         EndColumns();
 
     if (columns_count != 1)
@@ -14189,7 +14200,7 @@ void ImGui::ShowMetricsWindow(bool* p_open)
             {
                 for (int n = 0; n < window->ColumnsStorage.Size; n++)
                 {
-                    const ImGuiColumnsSet* columns = &window->ColumnsStorage[n];
+                    const ImGuiColumns* columns = &window->ColumnsStorage[n];
                     if (ImGui::TreeNode((void*)(uintptr_t)columns->ID, "Columns Id: 0x%08X, Count: %d, Flags: 0x%04X", columns->ID, columns->Count, columns->Flags))
                     {
                         ImGui::BulletText("Width: %.1f (MinX: %.1f, MaxX: %.1f)", columns->MaxX - columns->MinX, columns->MinX, columns->MaxX);
@@ -14295,9 +14306,9 @@ void ImGui::ShowMetricsWindow(bool* p_open)
             char buf[64] = "";
             char* p = buf;
             p += ImFormatString(p, buf + IM_ARRAYSIZE(buf) - p, "Order: %d\n", window->BeginOrderWithinContext);
-            ImDrawList* overlay_draw_list = GetForegroundDrawList(window->Viewport);
-            overlay_draw_list->AddRectFilled(window->Pos - ImVec2(1, 1), window->Pos + CalcTextSize(buf) + ImVec2(1, 1), IM_COL32(200, 100, 100, 255));
-            overlay_draw_list->AddText(NULL, 0.0f, window->Pos, IM_COL32(255, 255, 255, 255), buf);
+            ImDrawList* fg_draw_list = GetForegroundDrawList(window->Viewport);
+            fg_draw_list->AddRectFilled(window->Pos - ImVec2(1, 1), window->Pos + CalcTextSize(buf) + ImVec2(1, 1), IM_COL32(200, 100, 100, 255));
+            fg_draw_list->AddText(NULL, 0.0f, window->Pos, IM_COL32(255, 255, 255, 255), buf);
         }
     }
     ImGui::End();

imgui_demo.cpp

@@ -1697,7 +1697,6 @@ static void ShowDemoWindowWidgets()
                 if (ImGui::MenuItem("Close")) { test_window = false; }
                 ImGui::EndPopup();
             }
-            //if (IsItemHovered() || IsItemActive()) { printf("[%05d] Hovered %d Active %d\n", GetFrameCount(), IsItemHovered(), IsItemActive()); } // [DEBUG]
             ImGui::Text(
                 "IsItemHovered() after begin = %d (== is title bar hovered)\n"
                 "IsItemActive() after begin = %d (== is window being clicked/moved)\n",
@@ -4051,7 +4050,7 @@ static void ShowExampleAppConstrainedResize(bool* p_open)
 // Demonstrate creating a simple static window with no decoration + a context-menu to choose which corner of the screen to use.
 static void ShowExampleAppSimpleOverlay(bool* p_open)
 {
-    // FIXME-VIEWPORT-ABS: Select a default viewport
+    // FIXME-VIEWPORT: Select a default viewport
     const float DISTANCE = 10.0f;
     static int corner = 0;
     ImGuiIO& io = ImGui::GetIO();

imgui_internal.h

@@ -63,7 +63,7 @@ struct ImDrawDataBuilder;           // Helper to build a ImDrawData instance
 struct ImDrawListSharedData;        // Data shared between all ImDrawList instances
 struct ImGuiColorMod;               // Stacked color modifier, backup of modified data so we can restore it
 struct ImGuiColumnData;             // Storage data for a single column
-struct ImGuiColumnsSet;             // Storage data for a columns set
+struct ImGuiColumns;                // Storage data for a columns set
 struct ImGuiContext;                // Main imgui context
 struct ImGuiDockContext;            // Docking system context
 struct ImGuiDockNode;               // Docking system node (hold a list of Windows OR two child dock nodes)
@@ -681,7 +681,7 @@ struct ImGuiColumnData
     ImGuiColumnData()   { OffsetNorm = OffsetNormBeforeResize = 0.0f; Flags = 0; }
 };
 
-struct ImGuiColumnsSet
+struct ImGuiColumns
 {
     ImGuiID             ID;
     ImGuiColumnsFlags   Flags;
@@ -695,7 +695,7 @@ struct ImGuiColumnsSet
     float               StartMaxPosX;       // Copy of CursorMaxPos
     ImVector<ImGuiColumnData> Columns;
 
-    ImGuiColumnsSet()   { Clear(); }
+    ImGuiColumns()      { Clear(); }
     void Clear()
     {
         ID = 0;
@@ -1311,7 +1311,7 @@ struct IMGUI_API ImGuiWindowTempData
     ImVec1                  Indent;                 // Indentation / start position from left of window (increased by TreePush/TreePop, etc.)
     ImVec1                  GroupOffset;
     ImVec1                  ColumnsOffset;          // 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;             // Current columns set
+    ImGuiColumns*           CurrentColumns;         // Current columns set
 
     ImGuiWindowTempData()
     {
@@ -1342,7 +1342,7 @@ struct IMGUI_API ImGuiWindowTempData
         Indent = ImVec1(0.0f);
         GroupOffset = ImVec1(0.0f);
         ColumnsOffset = ImVec1(0.0f);
-        ColumnsSet = NULL;
+        CurrentColumns = NULL;
     }
 };
 
@@ -1414,7 +1414,7 @@ struct IMGUI_API ImGuiWindow
     float                   ItemWidthDefault;
     ImGuiMenuColumns        MenuColumns;                        // Simplified columns storage for menu items
     ImGuiStorage            StateStorage;
-    ImVector<ImGuiColumnsSet> ColumnsStorage;
+    ImVector<ImGuiColumns>  ColumnsStorage;
     float                   FontWindowScale;                    // User scale multiplier per-window
     float                   FontDpiScale;
     int                     SettingsIdx;                        // Index into SettingsWindow[] (indices are always valid as we only grow the array from the back)
@@ -1711,6 +1711,8 @@ namespace ImGui
     IMGUI_API void          BeginColumns(const char* str_id, int count, ImGuiColumnsFlags flags = 0); // setup number of columns. use an identifier to distinguish multiple column sets. close with EndColumns().
     IMGUI_API void          EndColumns();                                                             // close columns
     IMGUI_API void          PushColumnClipRect(int column_index = -1);
+    IMGUI_API ImGuiID       GetColumnsID(const char* str_id, int count);
+    IMGUI_API ImGuiColumns* FindOrCreateColumns(ImGuiWindow* window, ImGuiID id);
 
     // Tab Bars
     IMGUI_API bool          BeginTabBarEx(ImGuiTabBar* tab_bar, const ImRect& bb, ImGuiTabBarFlags flags, ImGuiDockNode* dock_node);

imgui_widgets.cpp

@@ -1240,7 +1240,7 @@ void ImGui::Separator()
     }
 
     // Horizontal Separator
-    if (window->DC.ColumnsSet)
+    if (window->DC.CurrentColumns)
         PopClipRect();
 
     float x1 = window->Pos.x;
@@ -1252,7 +1252,7 @@ void ImGui::Separator()
     ItemSize(ImVec2(0.0f, 0.0f)); // NB: we don't provide our width so that it doesn't get feed back into AutoFit, we don't provide height to not alter layout.
     if (!ItemAdd(bb, 0))
     {
-        if (window->DC.ColumnsSet)
+        if (window->DC.CurrentColumns)
             PushColumnClipRect();
         return;
     }
@@ -1262,10 +1262,10 @@ void ImGui::Separator()
     if (g.LogEnabled)
         LogRenderedText(&bb.Min, "--------------------------------");
 
-    if (window->DC.ColumnsSet)
+    if (window->DC.CurrentColumns)
     {
         PushColumnClipRect();
-        window->DC.ColumnsSet->LineMinY = window->DC.CursorPos.y;
+        window->DC.CurrentColumns->LineMinY = window->DC.CursorPos.y;
     }
 }
 
@@ -5337,7 +5337,7 @@ bool ImGui::Selectable(const char* label, bool selected, ImGuiSelectableFlags fl
     ImGuiContext& g = *GImGui;
     const ImGuiStyle& style = g.Style;
 
-    if ((flags & ImGuiSelectableFlags_SpanAllColumns) && window->DC.ColumnsSet) // FIXME-OPT: Avoid if vertically clipped.
+    if ((flags & ImGuiSelectableFlags_SpanAllColumns) && window->DC.CurrentColumns) // FIXME-OPT: Avoid if vertically clipped.
         PopClipRect();
 
     ImGuiID id = window->GetID(label);
@@ -5381,7 +5381,7 @@ bool ImGui::Selectable(const char* label, bool selected, ImGuiSelectableFlags fl
     }
     if (!item_add)
     {
-        if ((flags & ImGuiSelectableFlags_SpanAllColumns) && window->DC.ColumnsSet)
+        if ((flags & ImGuiSelectableFlags_SpanAllColumns) && window->DC.CurrentColumns)
             PushColumnClipRect();
         return false;
     }
@@ -5426,7 +5426,7 @@ bool ImGui::Selectable(const char* label, bool selected, ImGuiSelectableFlags fl
         RenderNavHighlight(bb, id, ImGuiNavHighlightFlags_TypeThin | ImGuiNavHighlightFlags_NoRounding);
     }
 
-    if ((flags & ImGuiSelectableFlags_SpanAllColumns) && window->DC.ColumnsSet)
+    if ((flags & ImGuiSelectableFlags_SpanAllColumns) && window->DC.CurrentColumns)
     {
         PushColumnClipRect();
         bb.Max.x -= (GetContentRegionMax().x - max_x);