从Java JHotDraw中重写的getActions在上下文菜单中创建子菜单 [英] Creating a submenu in context menu from overridden getActions in Java JHotDraw

问题描述

我在基于Java的框架中重写 getActions 方法 JHotDraw ，一个托管的开源项目这里。方法 getActions 在 Drawingview 图上创建一个右键单击上下文菜单$ C>。我可以使用下面的代码正确添加addidtional上下文菜单选项。我需要知道如何在上下文菜单中添加子菜单。

I am overriding the getActions method in the Java based framework JHotDraw, an open source project hosted here. The method getActions creates a right click context menu on Figure in the Drawingview. I can correctly add addidtional context menu options using the code below. I need to know how to add a sub menu to the context menu.

@Override
public Collection<Action> getActions(Point2D.Double p) {
  Collection<Action> popupMenu = new ArrayList<Action>();
  popupMenu.add(new AbstractAction("add Context Option 1") {
    public void actionPerformed(ActionEvent event) {
      preformThisMethod("params");
    }
  });
  popupMenu.add(new AbstractAction("add Context Option 2") {
    public void actionPerformed(ActionEvent event) {
      preformThisMethod("params");
    }
  });
  // How to add a sub menu to the context menu?
  return popupMenu;
}

推荐答案

支持添加子菜单。

类 org.jhotdraw.gui.JPopupButton extends JButton 提供整个框架中使用的弹出菜单。方法 add（javax.swing.JMenu子菜单）可用于构造分层子菜单。例如， org.jhotdraw.samples.draw.DrawingPanel 将 Zoom 子菜单添加到<$中最右边的弹出菜单中c $ c> creationToolbar ，以及其他杂项编辑操作。 org.jhotdraw.draw.action.ButtonFactory 中的方法 createFontButton（）是另一个用于<$ c $的示例c> addFontButtonsTo（）编辑器。

The class org.jhotdraw.gui.JPopupButton extends JButton to provide the popup menus used throughout the framework. The method add(javax.swing.JMenu submenu) may be used to construct hierarchical submenus. For example, org.jhotdraw.samples.draw.DrawingPanel adds a Zoom submenu to the rightmost popup menu in creationToolbar, along with other miscellaneous editing actions. The method createFontButton() in org.jhotdraw.draw.action.ButtonFactory is another example used to addFontButtonsTo() the editor.

相反，右键单击 org.jhotdraw.draw。 DefaultDrawingView 由 org.jhotdraw.draw.DelegationSelectionTool javax.swing.JPopupMenu 实例处理$ c>，如 org.jhotdraw.samples.mini.EditorSample 所示。特别是， AbstractAction 属性 Actions.SUBMENU_KEY 标识子菜单名称。设置 DEBUG = true 以查看效果。目前没有定义。

In contrast, right-clicking on the org.jhotdraw.draw.DefaultDrawingView is handled by an instance of javax.swing.JPopupMenu in org.jhotdraw.draw.DelegationSelectionTool, as shown in org.jhotdraw.samples.mini.EditorSample. In particular, the AbstractAction property Actions.SUBMENU_KEY identifies a submenu name. Set DEBUG = true to see the effect. None are presently defined.

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