swt的Display.syncExec无法执行

[valid25f]

只有一个要求 按下一个按钮显示一个进度条 5秒后让它不可见 期间程序不假死 比如仍然可以移动窗口
下面这段代码 会界面会卡死5秒 syncExec没法用？

package test;

import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.widgets.ProgressBar;

public class Bar extends Shell {

	/**
	 * Launch the application.
	 * @param args
	 */
	public static void main(String args[]) {
		try {
			Display display = Display.getDefault();
			Bar shell = new Bar(display);
			shell.open();
			shell.layout();
			while (!shell.isDisposed()) {
				if (!display.readAndDispatch()) {
					display.sleep();
				}
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	/**
	 * Create the shell.
	 * @param display
	 */
	public Bar(final Display display) {
		super(display, SWT.SHELL_TRIM);
		
		final ProgressBar progressBar = new ProgressBar(this, SWT.NONE);//HORIZONTAL | SWT.INDETERMINATE);
		progressBar.setBounds(119, 34, 170, 17);
		progressBar.setVisible(false);
		Button btnNewButton = new Button(this, SWT.NONE);
		btnNewButton.addSelectionListener(new SelectionAdapter() {
			@Override
			public void widgetSelected(SelectionEvent e) {
				progressBar.setVisible(true);
				try {
					Thread.sleep(5000);
				} catch (InterruptedException e1) {
					// TODO Auto-generated catch block
					e1.printStackTrace();
				}
				new Thread(new Sleep1(display)).start();
				progressBar.setVisible(false);
			}
		});
		btnNewButton.setBounds(169, 82, 72, 22);
		btnNewButton.setText("New Button");
		
		createContents();
	}

	/**
	 * Create contents of the shell.
	 */
	protected void createContents() {
		setText("SWT Application");
		setSize(450, 300);

	}

	@Override
	protected void checkSubclass() {
		// Disable the check that prevents subclassing of SWT components
	}
}

public class Sleep1 implements Runnable{

	
	private Display display;

	public Sleep1(Display display) {
		this.display=display;
	}

	@Override
	public void run() {
		display.syncExec(new Runnable(){

			@Override
			public void run() {
				// TODO Auto-generated method stub
				try {
					Thread.sleep(5000);
		
				} catch (InterruptedException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}});
	}
}

[地球原住民]

你应该用 asyncExec

[valid25f]

更正一下：第一个类的Thread.sleep(5000); 去掉了现象依然一样 progressBar.setVisible(true); try { Thread.sleep(5000); //这一行不要 } catch (InterruptedException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } new Thread(new Sleep1(display)).start(); 就是改成下面这样：

package test;

import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.widgets.ProgressBar;

public class Bar extends Shell {

	/**
	 * Launch the application.
	 * @param args
	 */
	public static void main(String args[]) {
		try {
			Display display = Display.getDefault();
			Bar shell = new Bar(display);
			shell.open();
			shell.layout();
			while (!shell.isDisposed()) {
				if (!display.readAndDispatch()) {
					display.sleep();
				}
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	/**
	 * Create the shell.
	 * @param display
	 */
	public Bar(final Display display) {
		super(display, SWT.SHELL_TRIM);
		
		final ProgressBar progressBar = new ProgressBar(this, SWT.NONE);//HORIZONTAL | SWT.INDETERMINATE);
		progressBar.setBounds(119, 34, 170, 17);
		progressBar.setVisible(false);
		Button btnNewButton = new Button(this, SWT.NONE);
		btnNewButton.addSelectionListener(new SelectionAdapter() {
			@Override
			public void widgetSelected(SelectionEvent e) {
				progressBar.setVisible(true);
				new Thread(new Sleep1(display)).start();
				progressBar.setVisible(false);
			}
		});
		btnNewButton.setBounds(169, 82, 72, 22);
		btnNewButton.setText("New Button");
		
		createContents();
	}

	/**
	 * Create contents of the shell.
	 */
	protected void createContents() {
		setText("SWT Application");
		setSize(450, 300);

	}

	@Override
	protected void checkSubclass() {
		// Disable the check that prevents subclassing of SWT components
	}
}

[valid25f]

引用 1 楼 javafreely 的回复:

你应该用 asyncExec

我是想 按按钮->显示进度条->等5秒->进度条消失 如果asyncExec 不到一毫秒就立刻消失了 跟没显示一样

[却天涯为客]

public class Bar extends Shell {

	/**
	 * Launch the application.
	 * 
	 * @param args
	 */
	public static void main(String args[]) {
		try {
			Display display = Display.getDefault();
			Bar shell = new Bar(display);
			shell.open();
			shell.layout();
			while (!shell.isDisposed()) {
				if (!display.readAndDispatch()) {
					display.sleep();
				}
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	/**
	 * Create the shell.
	 * 
	 * @param display
	 */
	public Bar(final Display display) {
		super(display, SWT.SHELL_TRIM);

		final ProgressBar progressBar = new ProgressBar(this, SWT.NONE);
		progressBar.setBounds(119, 34, 170, 17);
		progressBar.setVisible(false);
		Button btnNewButton = new Button(this, SWT.NONE);
		btnNewButton.addSelectionListener(new SelectionAdapter() {
			@Override
			public void widgetSelected(SelectionEvent e) {
				// progressBar.setVisible(true);
				new Thread(new Sleep1(display, progressBar)).start();
			}
		});
		btnNewButton.setBounds(169, 82, 72, 22);
		btnNewButton.setText("New Button");

		createContents();
	}

	/**
	 * Create contents of the shell.
	 */
	protected void createContents() {
		setText("SWT Application");
		setSize(450, 300);

	}

	@Override
	protected void checkSubclass() {
		// Disable the check that prevents subclassing of SWT components
	}

	public class Sleep1 implements Runnable {

		private Display display;
		private ProgressBar progressBar;

		public Sleep1(Display display, ProgressBar progressBar) {
			this.display = display;
			this.progressBar = progressBar;
		}

		@Override
		public void run() {
			display.syncExec(new Runnable() {

				@Override
				public void run() {
					progressBar.setVisible(true); // 这句也可以放在外面, 可以省代码
				}
			});
			try {
				Thread.sleep(5000);
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
			display.syncExec(new Runnable() {

				@Override
				public void run() {
					progressBar.setVisible(false);

				}
			});
		}
	}

}