如何隐藏SWT复合材料以使其不占用空间？ [英] How to hide an SWT composite so that it takes no space?

问题描述

我需要隐藏复合材料（以及所有儿童）。只需设置 setVisible（false）即可保留复合材料的空间。

I need to hide a composite (and all children inside). Just setting setVisible(false) will keep the space of the composite.

Composite outer = new Composite(parent, SWT.NONE);      
outer.setLayout(new GridLayout(1,false));
outer.setLayoutData(new GridData(GridData.FILL_BOTH) );

Composite compToHide = new MyComposite(outer, SWT.NONE);        
compToHide.setLayout(new GridLayout());
compToHide.setVisible(false);

推荐答案

这里有一些代码可以满足您的需求。我基本上使用 GridData＃exclude 与 Control #setVisible（boolean）一起隐藏/取消隐藏复合：

Here is some code that does what you want. I basically use GridData#exclude in combination with Control#setVisible(boolean) to hide/unhide the Composite:

public static void main(String[] args)
{
    Display display = new Display();
    final Shell shell = new Shell(display);
    shell.setText("StackOverflow");
    shell.setLayout(new GridLayout(1, true));

    Button hideButton = new Button(shell, SWT.PUSH);
    hideButton.setText("Toggle");

    final Composite content = new Composite(shell, SWT.NONE);
    content.setLayout(new GridLayout(3, false));

    final GridData data = new GridData(SWT.FILL, SWT.FILL, true, true);
    content.setLayoutData(data);

    for(int i = 0; i < 10; i++)
    {
        new Label(content, SWT.NONE).setText("Label " + i);
    }

    hideButton.addListener(SWT.Selection, new Listener()
    {
        @Override
        public void handleEvent(Event arg0)
        {
            data.exclude = !data.exclude;
            content.setVisible(!data.exclude);
            content.getParent().pack();
        }
    });

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

隐藏前：

隐藏后：

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