Added PushDisabled(), PopDisabled() currently only exposed in imgui_internal.h (#211)

imgui.cpp

@@ -7178,6 +7178,28 @@ void ImGui::PopItemFlag()
     g.CurrentItemFlags = g.ItemFlagsStack.back();
 }
 
+// PushDisabled()/PopDisabled()
+// - Those are not yet exposed in imgui.h because we are unsure of how to alter the style in a way that works for everyone.
+//   We may rework this. Hypothetically, a future styling system may set a flag which make widgets use different colors.
+// - Feedback welcome at https://github.com/ocornut/imgui/issues/211
+// - You may trivially implement your own variation of this if needed.
+//   Here we test (CurrentItemFlags & ImGuiItemFlags_Disabled) to allow nested PushDisabled() calls.
+void ImGui::PushDisabled()
+{
+    ImGuiContext& g = *GImGui;
+    if ((g.CurrentItemFlags & ImGuiItemFlags_Disabled) == 0)
+        PushStyleVar(ImGuiStyleVar_Alpha, g.Style.Alpha * 0.6f);
+    PushItemFlag(ImGuiItemFlags_Disabled, true);
+}
+
+void ImGui::PopDisabled()
+{
+    ImGuiContext& g = *GImGui;
+    PopItemFlag();
+    if ((g.CurrentItemFlags & ImGuiItemFlags_Disabled) == 0)
+        PopStyleVar();
+}
+
 // FIXME: Look into renaming this once we have settled the new Focus/Activation/TabStop system.
 void ImGui::PushAllowKeyboardFocus(bool allow_keyboard_focus)
 {

imgui.h

@@ -62,7 +62,7 @@ Index of this file:
 // Version
 // (Integer encoded as XYYZZ for use in #if preprocessor conditionals. Work in progress versions typically starts at XYY99 then bounce up to XYY00, XYY01 etc. when release tagging happens)
 #define IMGUI_VERSION               "1.84 WIP"
-#define IMGUI_VERSION_NUM           18305
+#define IMGUI_VERSION_NUM           18306
 #define IMGUI_CHECKVERSION()        ImGui::DebugCheckVersionAndDataLayout(IMGUI_VERSION, sizeof(ImGuiIO), sizeof(ImGuiStyle), sizeof(ImVec2), sizeof(ImVec4), sizeof(ImDrawVert), sizeof(ImDrawIdx))
 #define IMGUI_HAS_TABLE
 #define IMGUI_HAS_VIEWPORT          // Viewport WIP branch

imgui_internal.h

@@ -2604,6 +2604,8 @@ namespace ImGui
     IMGUI_API void          PushMultiItemsWidths(int components, float width_full);
     IMGUI_API void          PushItemFlag(ImGuiItemFlags option, bool enabled);
     IMGUI_API void          PopItemFlag();
+    IMGUI_API void          PushDisabled();
+    IMGUI_API void          PopDisabled();
     IMGUI_API bool          IsItemToggledSelection();                                   // Was the last item selection toggled? (after Selectable(), TreeNode() etc. We only returns toggle _event_ in order to handle clipping correctly)
     IMGUI_API ImVec2        GetContentRegionMaxAbs();
     IMGUI_API void          ShrinkWidths(ImGuiShrinkWidthItem* items, int count, float width_excess);