Question

我创建了几个链接按钮。

我希望所有按钮都在同一行。

每次插入新按钮，它都会到达下一行。

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;
}

我收到了错误消息错误是org.eclipse.swt.layout.GridData无法强制转换为org.eclipse.swt.layout.RowData

Answer 1

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

将GridLayout定义为包含Button s
使用RowLayout代替SWT.HORIZONTAL（您无需在此处定义商品数量）

以下是一些示例代码：

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();
}

这就是它的样子：

enter image description here

您的代码存在的问题是，您尝试使用GridData将Composite添加到RowLayout。那是不可能的。您的代码可以修复（并大规模压缩），如下所示：

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;
}

Answer 2

deGridLayout.numColumns = 1;

如果您有一列，则每个元素都会开始一个新行。定义一行GridLayout。

Answer 3

错误是你已经定义了一个带有1列的GridLayout

GridLayout deGridLayout = new GridLayout();
deGridLayout.numColumns = 1;
deComposite.setLayout(deGridLayout);

因此，每当您向面板“添加”一个组件时，您将填充当前行并将进入下一行。除此之外，你对GridLayout的使用相当奇怪。使用构造函数并定义它的行为而不是访问numColumns。

GridLayout deGridLayout = new GridLayout(10, 1); //Room for 10 components in one row.
deComposite.setLayout(deGridLayout);

这里的问题是;您的行中需要多少个组件（列）？

如何将所有按钮放在同一行？

3 个答案: