taskgui.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.swt.thread;

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.DisposeEvent;
import org.eclipse.swt.events.DisposeListener;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.VerifyEvent;
import org.eclipse.swt.events.VerifyListener;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Group;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.ProgressBar;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;

public class TaskGUI {
	private Task task = new Task(this); // Task为后台处理类
	// 将界面组件设为类的实例变量
	private Text taskCountText; // 任务数文本框
	private Button startButton;// “执行”按钮
	private Button stopButton;// “停止”按钮
	private ProgressBar progressBar;// 进度条
	private Text consoleText;// 用于输出日志的文本框

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

	public void open() {
		final Display display = Display.getDefault();
		final Shell shell = new Shell();
		shell.setSize(300, 300);
		shell.setLayout(new GridLayout());
		// 任务数文本框和按钮的组
		Group group = new Group(shell, SWT.NONE);
		group.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
		group.setLayout(new GridLayout(4, false));
		// 任务数文本框
		new Label(group, SWT.NONE).setText("任务数：");
		taskCountText = new Text(group, SWT.BORDER);
		taskCountText.setText("100");// 默认任务数100
		taskCountText.setLayoutData(new GridData(100, -1));
		taskCountText.addVerifyListener(new VerifyListener() {
			public void verifyText(VerifyEvent e) {// 只能输入数值
				e.doit = "0123456789".indexOf(e.text) >= 0;
			}
		});
		// 执行铵钮
		startButton = new Button(group, SWT.PUSH);
		startButton.setText("执行");
		startButton.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent e) {
				setButtonState(false);// 设置两个按钮有效/无效
				// 得到任务数。多线程使用的变量要求类型为final
				final int taskCount = Integer.valueOf(taskCountText.getText());
				progressBar.setMaximum(taskCount - 1);// 设置进度条的格数
				consoleText.insert("后台处理线程开始启动......\n");
				new Thread() {// 为后台任务新开一个线程
					public void run() {
						task.start(taskCount);
					}
				}.start();
				consoleText.insert("后台处理线程启动结束\n");
			}
		});
		// 停止按钮
		stopButton = new Button(group, SWT.PUSH);
		stopButton.setText("停止");
		stopButton.setEnabled(false);
		stopButton.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent e) {
				task.stop();// 后台任务停止
			}
		});
		// 进度条
		progressBar = new ProgressBar(shell, SWT.NONE);
		progressBar.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
		// 日志文本框
		consoleText = new Text(shell, SWT.MULTI | SWT.BORDER | SWT.V_SCROLL);
		consoleText.setLayoutData(new GridData(GridData.FILL_BOTH));
		// -----------------------------------------
		shell.layout();
		shell.open();
		shell.addDisposeListener(new DisposeListener() {
			public void widgetDisposed(DisposeEvent e) {
				task.stop();// 窗口关闭时，通知后台类停止处理
			}
		});
		while (!shell.isDisposed()) {
			if (!display.readAndDispatch())
				display.sleep();
		}
		display.dispose();

	}

	// 设置两按钮的有效/无效状态。true执行按钮有效,停止按钮无效
	public void setButtonState(boolean flag) {
		if (!startButton.isDisposed())
			startButton.setEnabled(flag);
		if (!stopButton.isDisposed())
			stopButton.setEnabled(!flag);
	}

	// 向前移动进度条
	public void moveProgress(int progress) {
		if (!progressBar.isDisposed())
			progressBar.setSelection(progress);
	}

	// 向consoleText文本框输入日志
	public void consolePrintln(String str) {
		// if (!consoleText.isDisposed())
		consoleText.insert(str);
	}
}