Cairo implementation for tracker widget drawRectangles() method.tracker_cairo

Fixes incompatibility of Tracker with GTK 3.x by omitting use
of gdk_color_white and gdk_set_foreground deprecated methods.

1 files changed, 20 insertions, 1 deletions

diff --git a/bundles/org.eclipse.swt/Eclipse SWT/gtk/org/eclipse/swt/widgets/Tracker.java b/bundles/org.eclipse.swt/Eclipse SWT/gtk/org/eclipse/swt/widgets/Tracker.java
index f24b0b0a1f..701085c35a 100644
--- a/bundles/org.eclipse.swt/Eclipse SWT/gtk/org/eclipse/swt/widgets/Tracker.java
+++ b/bundles/org.eclipse.swt/Eclipse SWT/gtk/org/eclipse/swt/widgets/Tracker.java
@@ -12,6 +12,7 @@ package org.eclipse.swt.widgets;
 
 
 import org.eclipse.swt.*;
+import org.eclipse.swt.internal.cairo.Cairo;
 import org.eclipse.swt.internal.gtk.*;
 import org.eclipse.swt.graphics.*;
 import org.eclipse.swt.events.*;
@@ -311,7 +312,25 @@ void drawRectangles (Rectangle [] rects) {
 		window = OS.GTK_WIDGET_WINDOW (parent.paintHandle());
 	} 
 	if (window == 0) return;
-	//TODO: Use Cairo
+
+	if(OS.USE_CAIRO){
+		int /*long*/ cairo = OS.gdk_cairo_create(window);
+		if (cairo == 0) error (SWT.ERROR_NO_HANDLES);
+		
+		Cairo.cairo_set_source_rgb(cairo, 1, 1, 1);
+		Cairo.cairo_set_line_width(cairo, 1);
+		Cairo.cairo_set_operator(cairo,Cairo.CAIRO_OPERATOR_DIFFERENCE);
+		Cairo.cairo_set_antialias(cairo, Cairo.CAIRO_ANTIALIAS_NONE);
+
+		for (int i=0; i<rects.length; i++) {
+			Rectangle rect = rects [i];
+			Cairo.cairo_rectangle (cairo, rect.x, rect.y, rect.width, rect.height);
+			Cairo.cairo_stroke(cairo);
+		}
+		Cairo.cairo_destroy(cairo);		
+		return;
+	}
+	
 	int /*long*/ gc = OS.gdk_gc_new (window);
 	if (gc == 0) return;
 	int /*long*/ colormap = OS.gdk_colormap_get_system ();