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通常理解stateMask的作用是标志事件发生时是否有Shift、Ctrl等键同时按下，但SWT里绝大多数Control都不支持这个标志，无论按下什么键，事件对象里的stateMask都是0（不信可以运行下面的代码）。更奇怪的是这个问题已经被提出3年多还没有解决，stateMask只对MenuItem有用，那要怎么实现对Button的Ctrl+Click检测呢？

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

public class ButtonTest {

public static void main(String[] args) {
  Display display = new Display();
  Shell shell = new Shell(display);
  shell.setLayout(new GridLayout());
  shell.setSize(200, 200);

  final Button button = new Button(shell, SWT.NONE);
  button.addSelectionListener(new SelectionAdapter() {
   public void widgetSelected(SelectionEvent e) {
    System.out.println(e.stateMask);//Always zero
   }
  });
  button.setText("Test");

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

posted on 2007-08-28 22:12 八进制阅读(1968) 评论(3) 编辑收藏所属分类: Eclipse

#1楼 2007-09-13 19:08 Pande

listen mouse event
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#2楼 2007-09-18 14:31 DeepNightTwo [未注册用户]

这样是可以的。（Eclipse 3.3M6下测试）

import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;

public class ButtonTest {

public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
shell.setLayout(new GridLayout());
shell.setSize(200, 200);

final Button button = new Button(shell, SWT.NONE);
button.addListener(SWT.MouseEnter, new Listener(){

public void handleEvent(Event event) {
System.out.println(event.stateMask);

}});
button.setText("Test");

shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
}
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#3楼 2007-10-12 10:43 liaowoxinyi [未注册用户]

可以向button添加鼠标事件，Eclipse3.2测试
button.addMouseListener(new MouseListener(){

public void mouseDoubleClick(MouseEvent e) {
// TODO Auto-generated method stub

}

public void mouseDown(MouseEvent e) {
// TODO Auto-generated method stub
System.out.println(e.stateMask+"----down");
}

public void mouseUp(MouseEvent e) {
}

});
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