[英]How to change parent of components with SWT?
My window should allow two different kind of layouts (it's a simple example to better illustrate it), eg 我的窗口应该允许两种不同的布局(这是一个更好地说明它的简单示例),例如
+-------------+-------------+-------------+
| Component 1 | Component 2 | Component 3 |
| | | |
| | | |
| | | |
| | | |
+-------------+-------------+-------------+
and 和
+-------------+---------------------------+
| Component 1 | Component 2 |
| | |
| +---------------------------+
| | Component 3 |
| | |
+-------------+---------------------------+
where the user can switch between both, eg, using a menu item. 用户可以在两者之间切换,例如,使用菜单项。
With SWT you need to provide the parent when creating a component. 使用SWT,您需要在创建组件时提供父级。 But we will need to (1) reuse the component and (2) place them in a different parent (similar to docking frameworks).
但我们需要(1)重用组件,(2)将它们放在不同的父组件中(类似于对接框架)。 How is this possible with SWT?
SWT如何实现这一目标?
You can simply do this by changing a component's parent. 您可以通过更改组件的父级来执行此操作。
setParent()
changes the control's parent, if the underlying operating system supports it . 如果底层操作系统支持 , 则
setParent()
更改控件的父级。 Then you can layout()
the composite so the changes appear. 然后,您可以
layout()
复合,以便显示更改。
Say you have three controls: 假设您有三个控件:
c1
containing vertical controls c1
c2
containing horizontal controls c2
lbl
lbl
btn
btn
Here's the code: 这是代码:
public class ControlSwitcher {
public static void main(String[] args) {
Display display = new Display();
final Shell shell = new Shell(display);
GridLayout gl = new GridLayout();
gl.marginWidth = gl.marginHeight = 20;
shell.setLayout(gl);
final Composite c1 = new Composite(shell, SWT.NONE);
c1.setBackground(new Color(display, 255, 160, 160));
RowLayout layout = new RowLayout(SWT.VERTICAL);
c1.setLayout(layout);
final Composite c2 = new Composite(c1, SWT.NONE);
c2.setBackground(new Color(display, 160, 255, 160));
c2.setLayout(new RowLayout());
final Label lbl = new Label(c2, SWT.NORMAL);
lbl.setText("Hello world");
final Button btn = new Button(c2, SWT.PUSH);
btn.setText("Switch");
btn.addSelectionListener(new SelectionListener() {
@Override
public void widgetSelected(SelectionEvent arg0) {
Composite target;
if (btn.getParent().equals(c2)) {
target = c1;
} else {
target = c2;
}
boolean success = btn.setParent(target);
if (success) {
target.pack();
shell.pack();
} else {
throw new RuntimeException("Not supported by this platform");
}
}
@Override
public void widgetDefaultSelected(SelectionEvent arg0) {
}
});
shell.pack();
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();
}
}
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