gtk3: provide a scheme where NWF can render the focus rects itself

Change-Id: Ide68e35964670f7acf7a9098b2e04451a17e335a

include/vcl/button.hxx

@@ -203,6 +203,7 @@ public:
     void            SetToggleHdl( const Link<>& rLink ) { maToggleHdl = rLink; }
     const Link<>&   GetToggleHdl() const { return maToggleHdl; }
     virtual bool    set_property(const OString &rKey, const OString &rValue) SAL_OVERRIDE;
+    virtual void    ShowFocus(const Rectangle& rRect) SAL_OVERRIDE;
 };
 
 inline void PushButton::Check( bool bCheck )

include/vcl/salnativewidgets.hxx

@@ -225,6 +225,9 @@ typedef sal_uInt32      ControlPart;
 //to draw natively the border of frames
 #define PART_BORDER             7000
 
+//to draw natively the focus rects
+#define PART_FOCUS              8000
+
 /* Control State:
  *
  *   Specify how a particular part of the control

include/vcl/window.hxx

@@ -1100,7 +1100,7 @@ public:
     /// Add all children to @rAllChildren recursively.
     SAL_DLLPRIVATE void                 CollectChildren(::std::vector<vcl::Window *>& rAllChildren );
 
-    void                                ShowFocus( const Rectangle& rRect );
+    virtual void                        ShowFocus(const Rectangle& rRect);
     void                                HideFocus();
 
     void                                Invert( const Rectangle& rRect, sal_uInt16 nFlags = 0 );

vcl/source/control/button.cxx

@@ -1657,6 +1657,20 @@ bool PushButton::set_property(const OString &rKey, const OString &rValue)
     return true;
 }
 
+void PushButton::ShowFocus(const Rectangle& rRect)
+{
+    bool bNativeOK;
+    if ((bNativeOK = IsNativeControlSupported(CTRL_PUSHBUTTON, PART_FOCUS)))
+    {
+        ImplControlValue aControlValue;
+        Rectangle aInRect(Point(), GetOutputSizePixel());
+        bNativeOK = GetOutDev()->DrawNativeControl(CTRL_PUSHBUTTON, PART_FOCUS, aInRect,
+                                                   ControlState::FOCUSED, aControlValue, OUString());
+    }
+    if (!bNativeOK)
+        Button::ShowFocus(rRect);
+}
+
 void OKButton::ImplInit( vcl::Window* pParent, WinBits nStyle )
 {
     PushButton::ImplInit( pParent, nStyle );

vcl/unx/gtk3/gdi/gtk3salnativewidgets-gtk.cxx

@@ -82,6 +82,7 @@ enum {
     RENDER_SPINBUTTON = 9,
     RENDER_COMBOBOX = 10,
     RENDER_EXTENSION = 11,
+    RENDER_FOCUS = 12,
 };
 
 static void NWCalcArrowRect( const Rectangle& rButton, Rectangle& rArrow )
@@ -801,7 +802,7 @@ bool GtkSalGraphics::drawNativeControl( ControlType nType, ControlPart nPart, co
 {
     GtkStateFlags flags;
     GtkShadowType shadow;
-    gint renderType = RENDER_BACKGROUND_AND_FRAME;
+    gint renderType = nPart == PART_FOCUS ? RENDER_FOCUS : RENDER_BACKGROUND_AND_FRAME;
     GtkStyleContext *context = NULL;
     const gchar *styleClass = NULL;
 
@@ -1034,6 +1035,21 @@ bool GtkSalGraphics::drawNativeControl( ControlType nType, ControlPart nPart, co
     case RENDER_COMBOBOX:
         PaintCombobox(flags, cr, rControlRegion, nType, nPart, rValue);
         break;
+    case RENDER_FOCUS:
+    {
+        GtkBorder border;
+
+        gtk_style_context_get_border(context, flags, &border);
+
+        nX += border.left;
+        nY += border.top;
+        nWidth -= border.left + border.right;
+        nHeight -= border.top + border.bottom;
+
+        gtk_render_focus(context, cr, nX, nY, nWidth, nHeight);
+
+        break;
+    }
     default:
         break;
     }
@@ -1626,7 +1642,7 @@ bool GtkSalGraphics::IsNativeControlSupported( ControlType nType, ControlPart nP
 //        case CTRL_PROGRESS:
 //        case CTRL_LISTNODE:
 //        case CTRL_LISTNET:
-            if(nPart==PART_ENTIRE_CONTROL)
+            if (nPart==PART_ENTIRE_CONTROL || nPart == PART_FOCUS)
                 return true;
             break;
 
@@ -1760,6 +1776,7 @@ void GtkData::initNWF()
     pSVData->maNWFData.mbCheckBoxNeedsErase = true;
     pSVData->maNWFData.mbCanDrawWidgetAnySize = true;
     pSVData->maNWFData.mbDDListBoxNoTextArea = true;
+    pSVData->maNWFData.mbNoFocusRects = true;
 }
 
 void GtkData::deInitNWF()