source: other-projects/nz-flag-design/trunk/design-2d/Original editor.method.ac/method-draw/lib/contextmenu.js@ 29468

/**
 * Package: svgedit.contextmenu
 * 
 * Licensed under the Apache License, Version 2
 * 
 * Author: Adam Bender
 */
// Dependencies:
// 1) jQuery (for dom injection of context menus)\

var svgedit = svgedit || {};
(function() {
    var self = this;
    if (!svgedit.contextmenu) {
        svgedit.contextmenu = {};
    }
    self.contextMenuExtensions = {}
    var addContextMenuItem = function(menuItem) {
        // menuItem: {id, label, shortcut, action}
        if (!menuItemIsValid(menuItem)) {
            console
                    .error("Menu items must be defined and have at least properties: id, label, action, where action must be a function");
            return;
        }
        if (menuItem.id in self.contextMenuExtensions) {
            console.error('Cannot add extension "' + menuItem.id
                    + '", an extension by that name already exists"');
            return;
        }
        // Register menuItem action, see below for deferred menu dom injection
        console.log("Registed contextmenu item: {id:"+ menuItem.id+", label:"+menuItem.label+"}");
        self.contextMenuExtensions[menuItem.id] = menuItem;
        //TODO: Need to consider how to handle custom enable/disable behavior
    }
    var hasCustomHandler = function(handlerKey) {
        return self.contextMenuExtensions[handlerKey] && true;
    }
    var getCustomHandler = function(handlerKey) {
        return self.contextMenuExtensions[handlerKey].action;
    }
    var injectExtendedContextMenuItemIntoDom = function(menuItem) {
        if (Object.keys(self.contextMenuExtensions).length == 0) {
            // all menuItems appear at the bottom of the menu in their own container.
            // if this is the first extension menu we need to add the separator.
            $("#cmenu_canvas").append("<li class='separator'>");
        }
        var shortcut = menuItem.shortcut || "";
        $("#cmenu_canvas").append("<li class='disabled'><a href='#" + menuItem.id + "'>"                   
                                    + menuItem.label + "<span class='shortcut'>"
                                    + shortcut + "</span></a></li>");
    }

    var menuItemIsValid = function(menuItem) {
        return menuItem && menuItem.id && menuItem.label && menuItem.action && typeof menuItem.action == 'function';
    }
    
    // Defer injection to wait out initial menu processing. This probably goes away once all context
    // menu behavior is brought here.
    methodDraw.ready(function() {
        for (menuItem in contextMenuExtensions) {
            injectExtendedContextMenuItemIntoDom(contextMenuExtensions[menuItem]);
        }
    });
    svgedit.contextmenu.resetCustomMenus = function(){self.contextMenuExtensions = {}}
    svgedit.contextmenu.add = addContextMenuItem;
    svgedit.contextmenu.hasCustomHandler = hasCustomHandler;
    svgedit.contextmenu.getCustomHandler = getCustomHandler;
})();