如何在复合SWT Java中使用中心标签

Question

我创建了一个Java SWT应用程序,我有一个包含标签的复合材料,标签的尺寸会不时变化.标签显示图像并具有监听器.如何将标签置于复合材料内？

我创建了一个shell:

Composite conteinerBox = new Composite(shell, SWT.NONE);
conteinerBox.setBackground(SWTResourceManager.getColor(SWT.COLOR_RED));
conteinerBox.setBounds(342, 10, 410, 384);

Label imageContainer = new Label(conteinerBox,SWT.NONE);
imageContainer.setBackground(SWTResourceManager.getColor(SWT.COLOR_WIDGET_DARK_SHADOW));

我用过这个函数:

private void openImage() {

    if(isAnImage(file.getPath())){
        System.out.println("FILE OPEN : " + file.getPath());
        Image image = getImage(file.getPath());


        //attach image

          imageContainer.setSize(image.getBounds().width,image.getBounds().height);
        imageContainer.setImage(image);

                   //set image mouse listener
        imageContainer.addMouseMoveListener(new MouseMoveListener() {

            @Override
            public void mouseMove(MouseEvent event) {

                x_mouse_cordinate.setText("" + event.x);
                y_mouse_cordinate.setText("" + event.y);

            }
        });
}

包含图像的标签贴在点(0,0)上,但我想把它放在复合材料中......建议？

Answer 1

请不要使用setBounds或setSize除非必要,否则请使用Layouts代替.

请阅读这个:

了解SWT中的布局

以下是一些Label水平居中的示例代码:

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

    final Label centered = new Label(shell, SWT.NONE);
    centered.setText("Small text");
    centered.setLayoutData(new GridData(SWT.CENTER, SWT.FILL, true, true));

    Button changeText = new Button(shell, SWT.PUSH);
    changeText.setText("Change text");
    changeText.addListener(SWT.Selection, new Listener()
    {
        @Override
        public void handleEvent(Event arg0)
        {
            centered.setText("Loooooooooooooooooooong text");
            centered.getParent().layout();
        }
    });


    shell.pack();
    shell.setSize(600, 200);
    shell.open();
    while (!shell.isDisposed())
    {
        while (!display.readAndDispatch())
        {
            display.sleep();
        }
    }
}

看起来像这样: