X-Git-Url: https://gerrit.simantics.org/r/gitweb?a=blobdiff_plain;f=bundles%2Forg.simantics.utils.ui%2Fsrc%2Forg%2Fsimantics%2Futils%2Fui%2Fawt%2FCleanResizeListener.java;fp=bundles%2Forg.simantics.utils.ui%2Fsrc%2Forg%2Fsimantics%2Futils%2Fui%2Fawt%2FCleanResizeListener.java;h=3f2081f2fefdb155a2f6811bd8fb55d01ee90525;hb=969bd23cab98a79ca9101af33334000879fb60c5;hp=0000000000000000000000000000000000000000;hpb=866dba5cd5a3929bbeae85991796acb212338a08;p=simantics%2Fplatform.git

diff --git a/bundles/org.simantics.utils.ui/src/org/simantics/utils/ui/awt/CleanResizeListener.java b/bundles/org.simantics.utils.ui/src/org/simantics/utils/ui/awt/CleanResizeListener.java
new file mode 100644
index 000000000..3f2081f2f
--- /dev/null
+++ b/bundles/org.simantics.utils.ui/src/org/simantics/utils/ui/awt/CleanResizeListener.java
@@ -0,0 +1,50 @@
+/*******************************************************************************
+ * Copyright (c) 2007 SAS Institute.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     SAS Institute - initial API and implementation
+ *******************************************************************************/
+package org.simantics.utils.ui.awt;
+
+import org.eclipse.swt.events.ControlAdapter;
+import org.eclipse.swt.events.ControlEvent;
+import org.eclipse.swt.graphics.GC;
+import org.eclipse.swt.graphics.Rectangle;
+import org.eclipse.swt.widgets.Composite;
+import org.eclipse.swt.widgets.Display;
+
+public class CleanResizeListener extends ControlAdapter {
+
+    private Rectangle oldRect = null;
+
+    public void controlResized(ControlEvent e) {
+        assert e != null;
+        assert Display.getCurrent() != null; // On SWT event thread
+
+        // Prevent garbage from Swing lags during resize. Fill exposed areas
+        // with background color.
+        Composite composite = (Composite) e.widget;
+        // Rectangle newRect = composite.getBounds();
+        // newRect = composite.getDisplay().map(composite.getParent(), composite, newRect);
+        Rectangle newRect = composite.getClientArea();
+        if (oldRect != null) {
+            int heightDelta = newRect.height - oldRect.height;
+            int widthDelta = newRect.width - oldRect.width;
+            if ((heightDelta > 0) || (widthDelta > 0)) {
+                GC gc = new GC(composite);
+                try {
+                    gc.fillRectangle(newRect.x, oldRect.height, newRect.width, heightDelta);
+                    gc.fillRectangle(oldRect.width, newRect.y, widthDelta, newRect.height);
+                } finally {
+                    gc.dispose();
+                }
+            }
+        }
+        oldRect = newRect;
+    }
+
+}