Internals: Track ActiveIdHasBeenPressed (similar to ActiveIdHasBeenEdited). This is currently mostly for the benefit of the range_select branch. (#1861)

imgui.cpp

@@ -2636,6 +2636,7 @@ void ImGui::SetActiveID(ImGuiID id, ImGuiWindow* window)
     if (g.ActiveIdIsJustActivated)
     {
         g.ActiveIdTimer = 0.0f;
+        g.ActiveIdHasBeenPressed = false;
         g.ActiveIdHasBeenEdited = false;
         if (id != 0)
         {

imgui_internal.h

@@ -423,7 +423,7 @@ enum ImGuiNavHighlightFlags_
     ImGuiNavHighlightFlags_None         = 0,
     ImGuiNavHighlightFlags_TypeDefault  = 1 << 0,
     ImGuiNavHighlightFlags_TypeThin     = 1 << 1,
-    ImGuiNavHighlightFlags_AlwaysDraw   = 1 << 2,
+    ImGuiNavHighlightFlags_AlwaysDraw   = 1 << 2,       // Draw rectangular highlight if (g.NavId == id) _even_ when using the mouse.
     ImGuiNavHighlightFlags_NoRounding   = 1 << 3
 };
 
@@ -792,6 +792,7 @@ struct ImGuiContext
     float                   ActiveIdTimer;
     bool                    ActiveIdIsJustActivated;            // Set at the time of activation for one frame
     bool                    ActiveIdAllowOverlap;               // Active widget allows another widget to steal active id (generally for overlapping widgets, but not always)
+    bool                    ActiveIdHasBeenPressed;             // Track whether the active id led to a press (this is to allow changing between PressOnClick and PressOnRelease without pressing twice). Used by range_select branch.
     bool                    ActiveIdHasBeenEdited;              // Was the value associated to the widget Edited over the course of the Active state.
     bool                    ActiveIdPreviousFrameIsAlive;
     bool                    ActiveIdPreviousFrameHasBeenEdited;
@@ -897,7 +898,8 @@ struct ImGuiContext
     ImVector<char>          PrivateClipboard;                   // If no custom clipboard handler is defined
 
     // Platform support
-    ImVec2                  PlatformImePos, PlatformImeLastPos; // Cursor position request & last passed to the OS Input Method Editor
+    ImVec2                  PlatformImePos;                     // Cursor position request & last passed to the OS Input Method Editor
+    ImVec2                  PlatformImeLastPos;
 
     // Settings
     bool                           SettingsLoaded;
@@ -948,6 +950,7 @@ struct ImGuiContext
         ActiveIdTimer = 0.0f;
         ActiveIdIsJustActivated = false;
         ActiveIdAllowOverlap = false;
+        ActiveIdHasBeenPressed = false;
         ActiveIdHasBeenEdited = false;
         ActiveIdPreviousFrameIsAlive = false;
         ActiveIdPreviousFrameHasBeenEdited = false;

imgui_widgets.cpp

@@ -507,6 +507,8 @@ bool ImGui::ButtonBehavior(const ImRect& bb, ImGuiID id, bool* out_hovered, bool
     bool held = false;
     if (g.ActiveId == id)
     {
+        if (pressed)
+            g.ActiveIdHasBeenPressed = true;
         if (g.ActiveIdSource == ImGuiInputSource_Mouse)
         {
             if (g.ActiveIdIsJustActivated)