java - 如何将所有按钮放在同一行？

Question

我创建了几个链接按钮。

我希望所有按钮都在同一行。

每次我插入新按钮时，它都会进入下一行。

public void createControls(Composite parent) {
    myComposite = new Composite(parent, SWT.NONE);

    GridLayout detailsSideGridLayout = new GridLayout();
    detailsSideGridLayout.numColumns = 1;
    myComposite.setLayout(detailsSideGridLayout);
    GridDatamyGridData = new GridData();
    myGridData.horizontalAlignment = SWT.FILL;
    myGridData.grabExcessHorizontalSpace = true;
    myGridData.verticalAlignment = SWT.FILL;
    myGridData.grabExcessVerticalSpace = true;
    myComposite.setLayoutData(myGridData);
    deComposite = new Composite(myComposite, SWT.NONE);
    RowLayout dgGridLayout = new RowLayout(SWT.HORIZONTAL);
    deComposite.setLayout(deGridLayout);

    GridData deGridData = new GridData();
    deGridData.horizontalAlignment = SWT.FILL;
    deGridData.grabExcessHorizontalSpace = true;

    LinkLabel createDetailsde = createDetailsde(deComposite);
    createDetailsde.setLayoutData(deGridData);
          //Add another button
    createLinkLabel(createDetailsde)

     myComposite.layout();
   private LinkLabel createDetailsde(Composite detailsComposite) {
    // TODO check resource manager implementation

    LinkLabel linkLabel = new LinkLabel(detailsComposite, SWT.NONE);
    linkLabel.setText("test"); //$NON-NLS-1$
    return linkLabel;

}

    private LinkLabel createLinkLabel(Composite detailsComposite) {
    LinkLabel linkLabel = new LinkLabel(detailsComposite, SWT.NONE);
    linkLabel.setText("test2"); //$NON-NLS-1$

    return linkLabel;
}

我收到错误信息错误是 org.eclipse.swt.layout.GridData cannot be cast to org.eclipse.swt.layout.RowData

Answer 1

您使用的 GridLayout 只有一列 (deGridLayout.numColumns = 1;)。您可以做两件事:

1. 定义 GridLayout 以包含您想要的 Button 的列数
2. 改用 RowLayout 和 SWT.HORIZONTAL(您不必在此处定义项目数)

下面是一些示例代码:

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

    Group first = new Group(shell, SWT.NONE);
    first.setText("RowLayout");
    first.setLayout(new RowLayout(SWT.HORIZONTAL));

    Group second = new Group(shell, SWT.NONE);
    second.setText("GridLayout");
    second.setLayout(new GridLayout(5, false));

    for (int i = 1; i < 5; i++)
    {
        new Button(first, SWT.PUSH).setText("Button " + i);
        new Button(second, SWT.PUSH).setText("Button " + i);
    }

    shell.pack();
    shell.open();

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

这是它的样子:

---

您的代码存在的问题是您试图使用 RowLayout 将 GridData 添加到 Composite。那是不可能的。您的代码可以像这样修复(并大量压缩):

public static void main(String[] args)
{
    Display display = new Display();
    final Shell shell = new Shell(display);
    shell.setText("StackOverflow");
    shell.setLayout(new GridLayout(2, false));

    Composite myComposite = new Composite(shell, SWT.NONE);
    myComposite.setLayout(new GridLayout(1, false));
    myComposite.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));

    Composite deComposite = new Composite(myComposite, SWT.NONE);
    deComposite.setLayout(new RowLayout(SWT.HORIZONTAL));

    Label createDetailsde = createDetailsde(deComposite);

    shell.pack();
    shell.open();

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

private static Label createDetailsde(Composite detailsComposite)
{
    Label linkLabel = new Label(detailsComposite, SWT.NONE);
    linkLabel.setText("test");
    return linkLabel;
}