--- /dev/null
+/*******************************************************************************\r
+ * Copyright (c) 2007 SAS Institute.\r
+ * All rights reserved. This program and the accompanying materials\r
+ * are made available under the terms of the Eclipse Public License v1.0\r
+ * which accompanies this distribution, and is available at\r
+ * http://www.eclipse.org/legal/epl-v10.html\r
+ *\r
+ * Contributors:\r
+ * SAS Institute - initial API and implementation\r
+ *******************************************************************************/\r
+package org.simantics.utils.ui.awt;\r
+\r
+import org.eclipse.swt.events.ControlAdapter;\r
+import org.eclipse.swt.events.ControlEvent;\r
+import org.eclipse.swt.graphics.GC;\r
+import org.eclipse.swt.graphics.Rectangle;\r
+import org.eclipse.swt.widgets.Composite;\r
+import org.eclipse.swt.widgets.Display;\r
+\r
+public class CleanResizeListener extends ControlAdapter {\r
+\r
+ private Rectangle oldRect = null;\r
+\r
+ public void controlResized(ControlEvent e) {\r
+ assert e != null;\r
+ assert Display.getCurrent() != null; // On SWT event thread\r
+\r
+ // Prevent garbage from Swing lags during resize. Fill exposed areas\r
+ // with background color.\r
+ Composite composite = (Composite) e.widget;\r
+ // Rectangle newRect = composite.getBounds();\r
+ // newRect = composite.getDisplay().map(composite.getParent(), composite, newRect);\r
+ Rectangle newRect = composite.getClientArea();\r
+ if (oldRect != null) {\r
+ int heightDelta = newRect.height - oldRect.height;\r
+ int widthDelta = newRect.width - oldRect.width;\r
+ if ((heightDelta > 0) || (widthDelta > 0)) {\r
+ GC gc = new GC(composite);\r
+ try {\r
+ gc.fillRectangle(newRect.x, oldRect.height, newRect.width, heightDelta);\r
+ gc.fillRectangle(oldRect.width, newRect.y, widthDelta, newRect.height);\r
+ } finally {\r
+ gc.dispose();\r
+ }\r
+ }\r
+ }\r
+ oldRect = newRect;\r
+ }\r
+\r
+}\r