SWT表格列随着控件变化自动变化

/*******************************************************************************
 * Copyright (c) 2000, 2004 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;

/*
 * Table example snippet: resize columns as table resizes
 *
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 */
import org.eclipse.swt.*;
import org.eclipse.swt.events.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;

public class Snippet77 {

public static void main(String[] args) {
	Display display = new Display();
	Shell shell = new Shell(display);
	shell.setLayout(new FillLayout());
		
	final Composite comp = new Composite(shell, SWT.NONE);
	final Table table = new Table(comp, SWT.BORDER | SWT.V_SCROLL);
	table.setHeaderVisible(true);
	table.setLinesVisible(true);
	final TableColumn column1 = new TableColumn(table, SWT.NONE);
	column1.setText("Column 1");
	final TableColumn column2 = new TableColumn(table, SWT.NONE);
	column2.setText("Column 2");
	for (int i = 0; i < 10; i++) {
		TableItem item = new TableItem(table, SWT.NONE);
		item.setText(new String[] {"item 0" + i, "item 1"+i});
	}
	comp.addControlListener(new ControlAdapter() {
		public void controlResized(ControlEvent e) {
			Rectangle area = comp.getClientArea();
			Point preferredSize = table.computeSize(SWT.DEFAULT, SWT.DEFAULT);
			int width = area.width - 2*table.getBorderWidth();
			if (preferredSize.y > area.height + table.getHeaderHeight()) {
				// Subtract the scrollbar width from the total column width
				// if a vertical scrollbar will be required
				Point vBarSize = table.getVerticalBar().getSize();
				width -= vBarSize.x;
			}
			Point oldSize = table.getSize();
			if (oldSize.x > area.width) {
				// table is getting smaller so make the columns 
				// smaller first and then resize the table to
				// match the client area width
				column1.setWidth(width/3);
				column2.setWidth(width - column1.getWidth());
				table.setSize(area.width, area.height);
			} else {
				// table is getting bigger so make the table 
				// bigger first and then make the columns wider
				// to match the client area width
				table.setSize(area.width, area.height);
				column1.setWidth(width/3);
				column2.setWidth(width - column1.getWidth());
			}
		}
	});
		
	shell.open();
	while (!shell.isDisposed()) {
		if (!display.readAndDispatch())
			display.sleep();
	}
	display.dispose();
}
}

效果图：

上面表格可以随着窗口的大小变化一起变化。

总结：现在看这个程序非常的简单，当时记得一开始想实现这个功能的时候找了半天，老是觉得是不是可以设置一个table的什么参数，就能够自适应了。其实，这里就是没有看清问题的本质，要实现的就是要当窗口变化时，改变table的布局就行，这样就自然有了上面的方法注册窗口或composite的变化就行了。