java - 如何右对齐 Horizo​​ntalPanel (GWT) 上的按钮

Question

我正在尝试实现一个简单的对话框。我希望确定和取消按钮在对话框底部对齐。我将按钮嵌入到 Horizo​​ntalPanel 中并尝试将水平对齐设置为 RIGHT。但是，这不起作用。如何使按钮对齐？谢谢你。这是片段:

private Widget createButtonsPanel() {
    HorizontalPanel hp = new HorizontalPanel();
    hp.setCellHorizontalAlignment(saveButton, HasHorizontalAlignment.ALIGN_RIGHT);
    hp.setCellHorizontalAlignment(cancelButton, HasHorizontalAlignment.ALIGN_RIGHT);
    hp.add(saveButton);
    hp.add(cancelButton);       

    return hp;
}

Answer 1

重点是在添加按钮之前调用setHorizo​​ntalAlignment ，如下所示:

final HorizontalPanel hp = new HorizontalPanel();
final Button saveButton = new Button("save");
final Button cancelButton = new Button("cancel");

// just to see the bounds of the HorizontalPanel
hp.setWidth("600px");
hp.setBorderWidth(2);

// It only applies to widgets added after this property is set.
hp.setHorizontalAlignment(HasHorizontalAlignment.ALIGN_RIGHT);

hp.add(saveButton);
hp.add(cancelButton);

RootPanel.get().add(hp);

如果你想让你的按钮紧密在一起 - 将它们都放入一些新容器中，然后将容器放在右对齐的 Horizo​​ntalPanel 中