diff --git a/lcl/interfaces/qt/qtwidgets.pas b/lcl/interfaces/qt/qtwidgets.pas
index e955667aa0..9babce5c5b 100644
--- a/lcl/interfaces/qt/qtwidgets.pas
+++ b/lcl/interfaces/qt/qtwidgets.pas
@@ -151,6 +151,8 @@ type
     function getGeometry: TRect; virtual;
     function getVisible: Boolean; virtual;
     function getText: WideString; virtual;
+    function getHeight: Integer;
+    function getWidth: Integer;
     procedure grabMouse; virtual;
     function hasFocus: Boolean; virtual;
     procedure lowerWidget;
@@ -2264,6 +2266,16 @@ begin
   Result := FText;
 end;
 
+function TQtWidget.getHeight: Integer;
+begin
+  Result := QWidget_height(Widget);
+end;
+
+function TQtWidget.getWidth: Integer;
+begin
+  Result := QWidget_width(Widget);
+end;
+
 function TQtWidget.getClientBounds: TRect;
 begin
   QWidget_contentsRect(Widget, @Result);
diff --git a/lcl/interfaces/qt/qtwinapi.inc b/lcl/interfaces/qt/qtwinapi.inc
index 370783b553..bd29b910b5 100644
--- a/lcl/interfaces/qt/qtwinapi.inc
+++ b/lcl/interfaces/qt/qtwinapi.inc
@@ -2334,19 +2334,67 @@ begin
 end;
 
 function TQtWidgetSet.GetScrollBarSize(Handle: HWND; BarKind: Integer): integer;
+var
+  w: TQtWidget;
+  ScrollBar: TQtScrollBar;
 begin
-  Result := 15;
-  {$ifdef VerboseQtWinAPI_MISSING_IMPLEMENTATION}
-    WriteLn('***** [WinAPI TQtWidgetSet.GetScrollBarSize] missing implementation ');
+	{$ifdef VerboseQtWinAPI}
+  writeln('Trace:> [WinAPI GetScrollBarSize] Handle: ' + dbghex(Handle),' BarKind: ',BarKind);
   {$endif}
+  Result := 0;
+  if Handle = 0 then exit;
+  
+  w := TQtWidget(Handle);
+  
+  {TODO: find out what to do with TCustomForm descendants }
+  if w is TQtAbstractScrollArea then
+  begin
+    if BarKind = SM_CYVSCROLL then
+      ScrollBar := TQtAbstractScrollArea(w).verticalScrollBar
+    else
+      ScrollBar := TQtAbstractScrollArea(w).horizontalScrollBar;
+  end else
+  if w is TQtScrollBar then
+  	ScrollBar := TQtScrollBar(w)
+  else
+    ScrollBar := nil;
+  if ScrollBar <> nil then
+  begin
+  	if BarKind = SM_CYVSCROLL then
+    	Result := ScrollBar.getWidth
+    else
+      Result := ScrollBar.getHeight;
+  end;
 end;
 
 function TQtWidgetSet.GetScrollbarVisible(Handle: HWND; SBStyle: Integer): boolean;
+var
+  w: TQtWidget;
+  ScrollBar: TQtScrollBar;
 begin
-  Result := False;
-  {$ifdef VerboseQtWinAPI_MISSING_IMPLEMENTATION}
-    WriteLn('***** [WinAPI TQtWidgetSet.GetScrollBarVisible] missing implementation ');
+	{$ifdef VerboseQtWinAPI}
+  writeln('Trace:> [WinAPI GetScrollBarVisible] Handle: ' + dbghex(Handle),' SBStyle: ',SBStyle);
   {$endif}
+  Result := False;
+  if Handle = 0 then exit;
+
+  w := TQtWidget(Handle);
+
+  {TODO: find out what to do with TCustomForm descendants }
+  if w is TQtAbstractScrollArea then
+  begin
+    if SBStyle = SB_VERT then
+      ScrollBar := TQtAbstractScrollArea(w).verticalScrollBar
+    else
+      ScrollBar := TQtAbstractScrollArea(w).horizontalScrollBar;
+  end else
+  if w is TQtScrollBar then
+  	ScrollBar := TQtScrollBar(w)
+  else
+    ScrollBar := nil;
+    
+  if ScrollBar <> nil then
+    Result := ScrollBar.getVisible;
 end;
 
 {------------------------------------------------------------------------------