SWT中的线程同步_Display.syncExec（Runnable）

最新推荐文章于 2021-02-21 18:43:27 发布

原创最新推荐文章于 2021-02-21 18:43:27 发布 · 2.9k 阅读

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#swt #thread #button #shell #action #object

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本文提供了一种解决SWT应用程序中画面阻塞问题的方法。通过创建一个独立的线程来更新UI元素的位置，避免了主线程的长时间占用，确保了程序的流畅运行。文章附带了一个具体的Java实现示例。

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不少人遇到过SWT中画面阻塞的问题，下面是一个解决方法，可供参照： import org.eclipse.swt.SWT; import org.eclipse.swt.events.DisposeEvent; import org.eclipse.swt.events.DisposeListener; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.events.SelectionListener; import org.eclipse.swt.graphics.Rectangle; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; public class ThreadTest { private Display display = null; private Shell shell = null; private int width = 600; private int height = 450; private Control movable = null; private Button action = null; private Thread thread = null; private boolean threadState = true; private static final Object LOCK = new Object(); public ThreadTest() { display = Display.getDefault(); shell = new Shell(display, SWT.SHELL_TRIM); shell.setSize(width, height); shell.setText("Thread Test"); shell.addDisposeListener(new DisposeListener() { public void widgetDisposed(DisposeEvent arg0) { thread.interrupt(); System.exit(0); } }); Rectangle monitorBounds = display.getPrimaryMonitor().getBounds(); shell.setLocation((monitorBounds.width - width) / 2, (monitorBounds.height - height) / 2); initMovableComposite(); initThread(); initActionButton(); shell.layout(); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) { display.sleep(); } } } private void initThread() { thread = new Thread() { Runnable runnable = new Runnable() { int deltX, deltY; Rectangle rect; public void run() { rect = movable.getBounds(); if (rect.x + rect.width >= shell.getBounds().width) { deltX = -1; } else if (rect.x <= 0) { deltX = 1; } if (rect.y + rect.width >= shell.getBounds().height) { deltY = -1; } else if (rect.y <= 0) { deltY = 1; } movable.setLocation(rect.x + deltX, rect.y + deltY); } }; public void run() { while (true) { synchronized (LOCK) { if (threadState) { display.syncExec(runnable); try { sleep(8); } catch (InterruptedException e) { e.printStackTrace(); } } else { try { sleep(1); } catch (InterruptedException e) { e.printStackTrace(); } } } } } }; } private void initMovableComposite() { movable = new Button(shell, SWT.TRANSPARENCY_ALPHA); ((Button)movable).setText("O"); movable.setBounds(0, 0, 80, 24); } private void initActionButton() { action = new Button(shell, SWT.ARROW | SWT.DOWN); action.setText("Act"); int w = 80; int h = 25; action.setBounds((width - w) / 2, h % 10, w, h); action.addSelectionListener(new SelectionListener() { public void widgetSelected(SelectionEvent event) { if (!thread.isAlive()) { thread.start(); } else { threadState = !threadState; } } public void widgetDefaultSelected(SelectionEvent event) {} }); } public static void main(String[] args) { new ThreadTest(); } }