GWT RootLayoutPanel用法 GWTRootLayoutPanel|GWT

GWT RootLayoutPanel允许我们选择布局面板的起点。在此面板中, 在创建时或调整窗口大小时都会调用RequiresResize.onResize()方法。
GWT RootLayoutPanel类声明
让我们看看com.google.gwt.user.client.ui.RootLayoutPanel的声明

public class RootLayoutPanel extends LayoutPanel

GWT RootLayoutPanel方法

修饰符和类型	方法	描述
静态RootLayoutPanel	get()	它获取RootLayoutPanel的单例实例。
protected void	onLoad()	在将小部件附加到浏览器的文档后立即调用它。

GWT RootLayoutPanel示例

import com.google.gwt.event.logical.shared.ResizeEvent; import com.google.gwt.event.logical.shared.ResizeHandler; import com.google.gwt.user.client.Window; /* This is the entry point method. */ public void onModuleLoad() {// Attach two child widgets to a LayoutPanel, laying them out horizontally, splitting at 50%. Widget childOne = new HTML("left"); Widget childTwo = new HTML("right"); LayoutPanel p = new LayoutPanel(); p.add(childOne); p.add(childTwo); p.setWidgetLeftWidth(childOne, 0, Unit.PCT, 50, Unit.PCT); p.setWidgetRightWidth(childTwo, 0, Unit.PCT, 50, Unit.PCT); // Attach the LayoutPanel to the RootLayoutPanel RootLayoutPanel.get().add(p); }

【GWT RootLayoutPanel用法】输出：