progressmonitordialog2.java

SWTJFace篇项目源程序该项目包含 包含了Eclipse下构建swt的基本工程

package cn.com.chengang.jface.dialog;

import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.jface.dialogs.ProgressMonitorDialog;
import org.eclipse.jface.operation.IRunnableWithProgress;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.RowLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;

public class ProgressMonitorDialog2 {

	public static void main(String[] args) {
		new ProgressMonitorDialog2().open();
	}

	public void open() {
		final Display display = Display.getDefault();
		final Shell shell = new Shell();
		shell.setSize(500, 375);

		shell.setLayout(new RowLayout());
		Button button = new Button(shell, SWT.NONE);
		button.setText("        GO          ");
		button.addSelectionListener(new SelectionAdapter() {
			private boolean stopFlag;// 停止标志

			private void go() {
				for (int i = 0; i < 10; i++) {// 循环10次，每次间隔一秒
					System.out.println("第" + (i + 1) + "个任务执行完毕");
					if (stopFlag) {// 监控是否要让停止后台任务
						System.out.println("被中断了");
						return;
					}
					try {
						Thread.sleep(1000);
					} catch (Throwable t) {}
				}
				stopFlag = true;// 执行完毕后把标志位设为停止，好通知给进度框
				System.out.println("全部任务执行完毕");
			}

			public void widgetSelected(SelectionEvent e) {
				stopFlag = false;// 每次都设初值为false
				new Thread() {// 把后台任务放到一个新开线程里执行
					public void run() {
						go();
					}
				}.start();
				showProgressDialog();// 打开一个进度框
			}

			private void showProgressDialog() {
				IRunnableWithProgress runnable = new IRunnableWithProgress() {
					public void run(IProgressMonitor monitor) {
						monitor.beginTask("正在执行中......", 30);
						int i = 0;
						while (true) {
							// 监听是否单击了进度框的“取消”按钮，stopFlag则是监听后台任务是否停止
							if (monitor.isCanceled() || stopFlag) {
								stopFlag = true; // 单击了“取消”按钮要设标志位为停止，好通知后台任务中断执行
								break;// 中断处理
							}
							// i到30后清零。并将进度条重新来过
							if ((++i) == 30) {
								i = 0;
								monitor.beginTask("正在执行中......", 30);
							}
							// 进度条每前进一步体息一会，不用太长或太短，时间可任意设。
							try {
								Thread.sleep(99);
							} catch (Throwable t) {}
							monitor.worked(1);// 进度条前进一步
						}
						monitor.done();// 进度条前进到完成
					}
				};
				try {
					new ProgressMonitorDialog(shell).run(true, true, runnable);
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		});

		shell.layout();
		shell.open();
		while (!shell.isDisposed()) {
			if (!display.readAndDispatch())
				display.sleep();
		}
	}

}