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| 17. 98. 1. 使用StackLayouts |
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To set a particular control on the top, you should first set the topControl field of the StackLayout with that control and then call the layout method of the parent composite. |
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import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.StackLayout;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
public class StackLayoutButtons {
public static void main(String[] args) {
Display display = new Display();
final Shell shell = new Shell(display);
final StackLayout stackLayout = new StackLayout();
shell.setLayout(stackLayout);
final Button[] buttons = new Button[3];
for (int i = 0; i < buttons.length; i++) {
buttons[i] = new Button(shell, SWT.NULL);
buttons[i].setText("Button #" + i);
buttons[i].addSelectionListener(new SelectionListener() {
public void widgetSelected(SelectionEvent e) {
// Flip to next button.
Button nextButton = null;
for (int i = 0; i < buttons.length; i++) {
if (buttons[i] == e.widget) {
if (i == buttons.length - 1)
nextButton = buttons[0];
else
nextButton = buttons[i + 1];
}
}
stackLayout.topControl = nextButton;
shell.layout();
}
public void widgetDefaultSelected(SelectionEvent e) {
}
});
}
stackLayout.topControl = buttons[0];
shell.setSize(450, 400);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();
}
}
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