snippet showing text that spans multiple columns

1 files changed, 95 insertions, 0 deletions

diff --git a/examples/org.eclipse.swt.snippets/src/org/eclipse/swt/snippets/Snippet240.java b/examples/org.eclipse.swt.snippets/src/org/eclipse/swt/snippets/Snippet240.java
new file mode 100644
index 0000000000..d52cddb0b8
--- /dev/null
+++ b/examples/org.eclipse.swt.snippets/src/org/eclipse/swt/snippets/Snippet240.java
@@ -0,0 +1,95 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2006 IBM Corporation and others.
+ * 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:
+ *     IBM Corporation - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.swt.snippets;
+
+/* 
+ * Tree snippet: Text that spans multiple columns
+ *
+ * For a list of all SWT example snippets see
+ * http://www.eclipse.org/swt/snippets/
+ * 
+ * @since 3.2
+ */
+
+import org.eclipse.swt.*;
+import org.eclipse.swt.graphics.*;
+import org.eclipse.swt.layout.*;
+import org.eclipse.swt.widgets.*;
+
+public class Snippet240 {
+
+public static void main(String [] args) {
+	final Display display = new Display();
+	Shell shell = new Shell (display);
+	shell.setText("Text spans two columns in a TreeItem");
+	shell.setLayout (new FillLayout());
+	final Tree tree = new Tree(shell, SWT.MULTI | SWT.FULL_SELECTION);
+	tree.setHeaderVisible(true);
+	int columnCount = 4;
+	for (int i=0; i<columnCount; i++) {
+		TreeColumn column = new TreeColumn(tree, SWT.NONE);
+		column.setText("Column " + i);	
+	}
+	int itemCount = 8;
+	for (int i = 0; i < itemCount; i++) {
+		TreeItem item = new TreeItem(tree, SWT.NONE);
+		item.setText(0, "item "+i+" a");
+		item.setText(3, "item "+i+" d");
+	}	
+	/*
+	 * NOTE: MeasureItem, PaintItem and EraseItem are called repeatedly.
+	 * Therefore, it is critical for performance that these methods be
+	 * as efficient as possible.
+	 */
+	final String string = "text that spans two columns";
+	GC gc = new GC(tree);
+	final Point extent = gc.stringExtent(string);
+	gc.dispose();
+	final Color red = display.getSystemColor(SWT.COLOR_RED);
+	Listener paintListener = new Listener() {
+		public void handleEvent(Event event) {
+			switch(event.type) {		
+				case SWT.MeasureItem: {
+					if (event.index == 1 || event.index == 2) {
+						event.width = extent.x/2;
+						event.height = Math.max(event.height, extent.y + 2);
+					}
+					break;
+				}
+				case SWT.PaintItem: {
+					if (event.index == 1 || event.index == 2) {
+						int offset = 0;
+						if (event.index == 2) {
+							TreeColumn column1 = tree.getColumn(1);
+							offset = column1.getWidth();
+						}
+						event.gc.setForeground(red);
+						int y = event.y + (event.height - extent.y)/2;
+						event.gc.drawString(string, event.x - offset, y);
+					}
+					break;
+				}
+			}
+		}
+	};
+	tree.addListener(SWT.MeasureItem, paintListener);
+	tree.addListener(SWT.PaintItem, paintListener);
+	for (int i = 0; i < columnCount; i++) {
+		tree.getColumn(i).pack();
+	}
+	shell.pack();
+	shell.open();
+	while(!shell.isDisposed()) {
+		if(!display.readAndDispatch()) display.sleep();
+	}
+	display.dispose();
+}
+}
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