动态添加和删除面板GWT

Question

我试图在GWT中添加/删除面板。首先，我声明了面板和一些标签（用作按钮）。

    DockPanel dockPanel = new DockPanel();
    RootLayoutPanel rootLayout = RootLayoutPanel.get();

    Label one = new Label("First Button");
    Label two = new Label("Second Button");

然后我有这个初始化各种面板

    public void initPanels() {

        dockPanel.add(one, DockPanel.EAST);
        rootLayout.add(dockPanel);

我添加了一些点击处理程序，然后将请求发送到此类，然后删除一个面板并将其替换为另一个面板，只有我无法解决如何操作：

public void getActivePanel(String activePanelName){

    if (activePanelName==null){ 
        dockPanel.add(one, DockPanel.EAST);
    }

    else if (activePanelName == "two"){

                    //can't figure this bit out
        //dockPanel.remove(AnotherLabel);
        //dockPanel.remove((IsWidget) DockPanel.EAST);
        //dockPanel.add(two, DockPanel.EAST);
    }

}

Answer 1

你可以这样做：

dockPanel.remove(one);
dockPanel.add(two, DockPanel.EAST);