在SWT中FocusListener可以用来监听一个textfield是否被选中,
在下面的程序里,我在两个text上加了FocusListener,功能是当
text被选中时,上面的文字会呈全选状态。
我不知道为什么只对第一个有效?
后来才发现是因为两个text的类型不一样。
只是对SWT.SINGLE的text,好象selectAll()无效 。
//TextField1.java
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.FocusEvent;
import org.eclipse.swt.events.FocusListener;
import org.eclipse.swt.widgets.*;
public class TextField1 {
Display d;
Shell s;
TextField1( ) {
d = new Display( );
s = new Shell(d);
s.setSize(250,250);
s.setText("A Text Field Example");
Text text1 = new Text(s, SWT.WRAP |SWT.BORDER);
text1.setBounds(100,50,100,20);
text1.setTextLimit(5);
text1.setText("12345");
Text text2 = new Text(s, SWT.SINGLE | SWT.BORDER);
text2.setBounds(100,75,100,20);
text2.setTextLimit(10);
// add a focus listener
FocusListener focusListener = new FocusListener( ) {
public void focusGained(FocusEvent e) {
Text t = (Text)e.widget;
t.selectAll();
}
public void focusLost(FocusEvent e) {
Text t = (Text)e.widget;
if(t.getSelectionCount( ) > 0){
t.clearSelection( );
}
}
};
text1.addFocusListener(focusListener);
text2.addFocusListener(focusListener);
s.open( );
while(!s.isDisposed( )){
if(!d.readAndDispatch( ))
d.sleep( );
}
d.dispose( );
}
public static void main(String[] args) {
TextField1 tx = new TextField1();
}
}