contextmenu.js

对java中如何使用Ajax技术

/*
	Copyright (c) 2004-2006, The Dojo Foundation
	All Rights Reserved.

	Licensed under the Academic Free License version 2.1 or above OR the
	modified BSD license. For more information on Dojo licensing, see:

		http://dojotoolkit.org/community/licensing.shtml
*/

dojo.provide("dojo.widget.Editor2Plugin.ContextMenu");

// summary: dojo.widget.Editor2Plugin.ContextMenu provides context menu for Editor2 widget
// description:
//		This plugin should be dojo.required-ed before all other plugins which
//		support contextmenu, otherwise the menu for that plugin won't be shown
//		For each Editor2, what will appear in its context menu can be set by changing
//		Editor2.contextMenuGroupSet property (by default it is empty, which means use the
//		default contextMenu). A contextMenuGroupSet has to be registered by calling
//		dojo.widget.Editor2Plugin.ContextMenuManager.registerGroupSet()
//		All Editor2 with the same contextMenuGroupSet will share the same ContextMenu

dojo.require("dojo.widget.Menu2");

dojo.event.topic.subscribe("dojo.widget.Editor2::onLoad", function(editor){
	dojo.widget.Editor2Plugin.ContextMenuManager.getContextMenu(editor);
//	var p = new dojo.widget.Editor2Plugin.ContextMenu();
});

dojo.widget.Editor2Plugin.ContextMenuManager = {
	menuGroups: ['Generic', 'Link', 'Anchor', 'Image', 'List', 'Table'],
	_contextMenuGroupSets: {},
	_registeredGroups: {},
	_menus: {},
	registerGroup: function(name, handler){
		if(this._registeredGroups[name]){
			alert("dojo.widget.Editor2Plugin.ContextMenuManager.registerGroup: menu group "+name+"is already registered. Ignored.");
			return;
		}
		this._registeredGroups[name] = handler;
	},
	removeGroup: function(name){
		delete this._registeredGroups[name];
	},
	getGroup: function(name, contextmenuplugin){
		if(this._registeredGroups[name]){
			var item = this._registeredGroups[name](name, contextmenuplugin);
			if(item){
				return item;
			}
		}
		switch(name){
			case 'Generic':
			case 'Link':
			case 'Image':
				return new dojo.widget.Editor2Plugin[name+"ContextMenuGroup"](contextmenuplugin);
			//TODO
			case 'Anchor':
			case 'List':
		}
	},
	registerGroupSet: function(/*String*/name, /*Array*/set){
		// summary: register a group set
		// name: name of the group set
		// set: an array of groups, such as ['Generic','Link']
		this._contextMenuGroupSets[name] = set;
	},
	removeGroupSet: function(name){
		var set = this._contextMenuGroupSets[name];
		delete this._contextMenuGroupSets[name];
		return set;
	},
	getContextMenu: function(editor){
		var set = editor.contextMenuGroupSet || 'defaultDojoEditor2MenuGroupSet';
		if(this._menus[set]){
			this._menus[set].bindEditor(editor);
			return this._menus[set];
		}

		var gs = (editor.contextMenuGroupSet && this._contextMenuGroupSets[editor.contextMenuGroupSet]) || this.menuGroups;
		var menu = new dojo.widget.Editor2Plugin.ContextMenu(editor, gs);
		this._menus[set] = menu;
		return menu;
	}
};

dojo.declare("dojo.widget.Editor2Plugin.ContextMenu", null,
	function(editor, gs){
		this.groups = [];
		this.separators = [];
		this.editor = editor;
		this.editor.registerLoadedPlugin(this);
		this.contextMenu = dojo.widget.createWidget("PopupMenu2", {});
		dojo.body().appendChild(this.contextMenu.domNode);
		this.bindEditor(this.editor);

		dojo.event.connect(this.contextMenu, "aboutToShow", this, "aboutToShow");
		dojo.event.connect(this.editor, "destroy", this, "destroy");

		this.setup(gs);
	},
	{
	bindEditor: function(editor){
		this.contextMenu.bindDomNode(editor.document.body);
	},
	setup: function(gs){
		for(var i in gs){
			var g = dojo.widget.Editor2Plugin.ContextMenuManager.getGroup(gs[i], this);
			if(g){
				this.groups.push(g);
			}
		}
	},
	aboutToShow: function(){
		var first = true;
		for(var i in this.groups){
			if(i>0 && this.separators.length != this.groups.length-1){
				this.separators.push(dojo.widget.createWidget("MenuSeparator2", {}));
				this.contextMenu.addChild(this.separators[this.separators.length-1]);
			}
			if(this.groups[i].refresh()){
				if(i>0){
					if(first){
						this.separators[i-1].hide();
					}else{
						this.separators[i-1].show();
					}
				}
				if(first){ first = false; }
			}else{
				if(i>0){
					this.separators[i-1].hide();
				}
			}
		}
	},
	destroy: function(){
		this.editor.unregisterLoadedPlugin(this);
		delete this.groups;
		delete this.separators;
		this.contextMenu.destroy();
		delete this.contextMenu;
	}
});

dojo.widget.defineWidget(
	"dojo.widget.Editor2ContextMenuItem",
	dojo.widget.MenuItem2,
{
	command: '',
	buildRendering: function(){
		var curInst = dojo.widget.Editor2Manager.getCurrentInstance();
		this.caption = curInst.getCommand(this.command).getText();

		dojo.widget.Editor2ContextMenuItem.superclass.buildRendering.apply(this, arguments);
	},
	onClick: function(){
		var curInst = dojo.widget.Editor2Manager.getCurrentInstance();
		if(curInst){
			var _command = curInst.getCommand(this.command);
			if(_command){
				_command.execute();
			}
		}
	},
	refresh: function(){
		var curInst = dojo.widget.Editor2Manager.getCurrentInstance();
		if(curInst){
			var _command = curInst.getCommand(this.command);
			if(_command){
				if(_command.getState() == dojo.widget.Editor2Manager.commandState.Disabled){
					this.disable();
					return false;
				}else{
					this.enable();
					return true;
				}
			}
		}
	},
	//improve performance by skipping animation
	hide: function(){
		this.domNode.style.display = "none";
	},
	show: function(){
		this.domNode.style.display = "";
	}
});
dojo.declare("dojo.widget.Editor2Plugin.SimpleContextMenuGroup", null,
	function(contextmenuplugin){
		this.contextMenu = contextmenuplugin.contextMenu;
		this.items = [];

		dojo.event.connect(contextmenuplugin, "destroy", this, "destroy");
	},
	{
	refresh: function(){
		if(!this.items.length){
			this.createItems();
			for(var i in this.items){
				this.contextMenu.addChild(this.items[i]);
			}
		}

		return this.checkVisibility();
	},
	destroy: function(){
		this.contextmenu = null;
		delete this.items;
		delete this.contextMenu;
	},
	//implement this to fill in the menu items
	createItems: function(){	},

	//overload this to show/hide items
	checkVisibility: function(){
		var show = false;
		for(var i in this.items){
			show = show || this.items[i].refresh();
		}
		var action = show ? "show" : "hide";
		for(var i in this.items){
			this.items[i][action]();
		}
		return show;
	}
});
dojo.declare("dojo.widget.Editor2Plugin.GenericContextMenuGroup",
	dojo.widget.Editor2Plugin.SimpleContextMenuGroup,
{
	createItems: function(){
		this.items.push(dojo.widget.createWidget("Editor2ContextMenuItem", {command: "cut", iconClass: "dojoE2TBIcon dojoE2TBIcon_Cut"}));
		this.items.push(dojo.widget.createWidget("Editor2ContextMenuItem", {command: "copy", iconClass: "dojoE2TBIcon dojoE2TBIcon_Copy"}));
		this.items.push(dojo.widget.createWidget("Editor2ContextMenuItem", {command: "paste", iconClass: "dojoE2TBIcon dojoE2TBIcon_Paste"}));
	}
});
dojo.declare("dojo.widget.Editor2Plugin.LinkContextMenuGroup",
	dojo.widget.Editor2Plugin.SimpleContextMenuGroup,
{
	createItems: function(){
		this.items.push(dojo.widget.createWidget("Editor2ContextMenuItem", {command: 'createlink', iconClass: "dojoE2TBIcon dojoE2TBIcon_Link"}));
		this.items.push(dojo.widget.createWidget("Editor2ContextMenuItem", {command: 'unlink', iconClass: "dojoE2TBIcon dojoE2TBIcon_UnLink"}));
	},
	checkVisibility: function(){
		var show = this.items[1].refresh();
		if(show){
			this.items[0].refresh();
			for(var i in this.items){
				this.items[i].show();
			}
		}else{
			for(var i in this.items){
				this.items[i].hide();
			}
		}

		return show;
	}
});
dojo.declare("dojo.widget.Editor2Plugin.ImageContextMenuGroup",
	dojo.widget.Editor2Plugin.SimpleContextMenuGroup,
{
	createItems: function(){
		this.items.push(dojo.widget.createWidget("Editor2ContextMenuItem", {command: 'insertimage', iconClass: "dojoE2TBIcon dojoE2TBIcon_Image"}));
	},
	checkVisibility: function(){
		var curInst = dojo.widget.Editor2Manager.getCurrentInstance();
		var img = dojo.withGlobal(curInst.window, "getSelectedElement", dojo.html.selection);

		if(img && img.tagName.toLowerCase() == 'img'){
			this.items[0].show();
			return true;
		}else{
			this.items[0].hide();
			return false;
		}
	}
});