cocoa: lcl: adding a new capability lcCanDrawHidden for widgetsets with optimized drawing that can draw hidden on offscreen controls (macOS). bug #35678

git-svn-id: trunk@61341 -

lcl/include/wincontrol.inc

@@ -4924,8 +4924,9 @@ begin
       if not (TempControl is TWinControl) then begin
         //DebugLn('TWinControl.PaintControls B Self=',Self.Name,':',Self.ClassName,' Control=',TempControl.Name,':',TempControl.ClassName,' ',TempControl.Left,',',TempControl.Top,',',TempControl.Width,',',TempControl.Height);
         with TempControl do
-          if IsVisible
-          and RectVisible(DC, TempControl.BoundsRect) then
+          if ((WidgetSet.GetLCLCapability(lcCanDrawHidden) = LCL_CAPABILITY_YES) and isControlVisible)
+            or (IsVisible and RectVisible(DC, TempControl.BoundsRect))
+          then
           begin
             if csPaintCopy in Self.ControlState then
               Include(FControlState, csPaintCopy);

lcl/interfacebase.pp

@@ -71,7 +71,8 @@ type
     lcRadialGradientBrush,      // Indicates that the function CreateBrushWithRadialGradient is supported, i.e. we can create a brush with a radial gradient pattern
     lcTransparentWindow,        // ability to pass mouse messages through a window (on win32 LM_NCHITTEST with HTTRANSPARENT result)
     lcTextHint,                 // native TextHint support
-    lcNativeTaskDialog          // task dialog under mswindows for widgetsets different than win32/wince. Used in LCLTaskDialog. eg Qt/Qt5 must set this option to false otherwise taskdialog segfaults.
+    lcNativeTaskDialog,         // task dialog under mswindows for widgetsets different than win32/wince. Used in LCLTaskDialog. eg Qt/Qt5 must set this option to false otherwise taskdialog segfaults.
+    lcCanDrawHidden             // the system rendering engine might request a hidden control to be drawn (macOS 10.9 and later)
   );
 
   { TDialogButton }

lcl/interfaces/cocoa/cocoaobject.inc

@@ -280,9 +280,10 @@ begin
     {$ifdef COCOA_USE_NATIVE_MODAL}
     lcModalWindow,
     {$endif}
-    lcAntialiasingEnabledByDefault:
+    lcAntialiasingEnabledByDefault,
+    lcTransparentWindow,
+    lcCanDrawHidden:
       Result := LCL_CAPABILITY_YES;
-    lcTransparentWindow: Result := LCL_CAPABILITY_YES;
   else
     Result := inherited;
   end;