container.js

一个struts和extjs得源码

     * <p>example:</p><pre><code>
var myNewGrid = new Ext.grid.GridPanel({
    store: myStore,
    colModel: myColModel
});
myTabPanel.add(myNewGrid);
myTabPanel.setActiveTab(myNewGrid);
</code></pre>
     */
    add : function(comp){
        if(!this.items){
            this.initItems();
        }
        var a = arguments, len = a.length;
        if(len > 1){
            for(var i = 0; i < len; i++) {
                this.add(a[i]);
            }
            return;
        }
        var c = this.lookupComponent(this.applyDefaults(comp));
        var pos = this.items.length;
        if(this.fireEvent('beforeadd', this, c, pos) !== false && this.onBeforeAdd(c) !== false){
            this.items.add(c);
            c.ownerCt = this;
            this.fireEvent('add', this, c, pos);
        }
        return c;
    },

    /**
     * Inserts a Component into this Container at a specified index. Fires the
     * {@link #beforeadd} event before inserting, then fires the {@link #add} event after the
     * Component has been inserted.
     * @param {Number} index The index at which the Component will be inserted
     * into the Container's items collection
     * @param {Ext.Component} component The child Component to insert.<br><br>
     * Ext uses lazy rendering, and will only render the inserted Component should
     * it become necessary.<br><br>
     * A Component config object may be passed in order to avoid the overhead of
     * constructing a real Component object if lazy rendering might mean that the
     * inserted Component will not be rendered immediately. To take advantage of
     * this "lazy instantiation", set the {@link Ext.Component#xtype} config
     * property to the registered type of the Component wanted.<br><br>
     * For a list of all available xtypes, see {@link Ext.Component}.
     * @return {Ext.Component} component The Component (or config object) that was
     * inserted with the Container's default config values applied.
     */
    insert : function(index, comp){
        if(!this.items){
            this.initItems();
        }
        var a = arguments, len = a.length;
        if(len > 2){
            for(var i = len-1; i >= 1; --i) {
                this.insert(index, a[i]);
            }
            return;
        }
        var c = this.lookupComponent(this.applyDefaults(comp));

        if(c.ownerCt == this && this.items.indexOf(c) < index){
            --index;
        }

        if(this.fireEvent('beforeadd', this, c, index) !== false && this.onBeforeAdd(c) !== false){
            this.items.insert(index, c);
            c.ownerCt = this;
            this.fireEvent('add', this, c, index);
        }
        return c;
    },

    // private
    applyDefaults : function(c){
        if(this.defaults){
            if(typeof c == 'string'){
                c = Ext.ComponentMgr.get(c);
                Ext.apply(c, this.defaults);
            }else if(!c.events){
                Ext.applyIf(c, this.defaults);
            }else{
                Ext.apply(c, this.defaults);
            }
        }
        return c;
    },

    // private
    onBeforeAdd : function(item){
        if(item.ownerCt){
            item.ownerCt.remove(item, false);
        }
        if(this.hideBorders === true){
            item.border = (item.border === true);
        }
    },

    /**
     * Removes a component from this container.  Fires the {@link #beforeremove} event before removing, then fires
     * the {@link #remove} event after the component has been removed.
     * @param {Component/String} component The component reference or id to remove.
     * @param {Boolean} autoDestroy (optional) True to automatically invoke the removed Component's {@link Ext.Component#destroy} function.
     * Defaults to the value of this Container's {@link #autoDestroy} config.
     * @return {Ext.Component} component The Component that was removed.
     */
    remove : function(comp, autoDestroy){
        var c = this.getComponent(comp);
        if(c && this.fireEvent('beforeremove', this, c) !== false){
            this.items.remove(c);
            delete c.ownerCt;
            if(autoDestroy === true || (autoDestroy !== false && this.autoDestroy)){
                c.destroy();
            }
            if(this.layout && this.layout.activeItem == c){
                delete this.layout.activeItem;
            }
            this.fireEvent('remove', this, c);
        }
        return c;
    },
    
    /**
     * Removes all components from this container.
     * @param {Boolean} autoDestroy (optional) True to automatically invoke the removed Component's {@link Ext.Component#destroy} function.
     * Defaults to the value of this Container's {@link #autoDestroy} config.
     * @return {Array} Array of the destroyed components
     */
    removeAll: function(autoDestroy){
        var item, items = [];
        while((item = this.items.last())){
            items.unshift(this.remove(item, autoDestroy));
        }
        return items;
    },

    /**
     * Gets a direct child Component by id, or by index.
     * @param {String/Number} id or index of child Component to return.
     * @return Ext.Component
     */
    getComponent : function(comp){
        if(typeof comp == 'object'){
            return comp;
        }
        return this.items.get(comp);
    },

    // private
    lookupComponent : function(comp){
        if(typeof comp == 'string'){
            return Ext.ComponentMgr.get(comp);
        }else if(!comp.events){
            return this.createComponent(comp);
        }
        return comp;
    },

    // private
    createComponent : function(config){
        return Ext.ComponentMgr.create(config, this.defaultType);
    },

    /**
     * Force this container's layout to be recalculated. A call to this function is required after adding a new component
     * to an already rendered container, or possibly after changing sizing/position properties of child components.
     * @param {Boolean} shallow (optional) True to only calc the layout of this component, and let child components auto
     * calc layouts as required (defaults to false, which calls doLayout recursively for each subcontainer)
     */
    doLayout : function(shallow){
        if(this.rendered && this.layout){
            this.layout.layout();
        }
        if(shallow !== false && this.items){
            var cs = this.items.items;
            for(var i = 0, len = cs.length; i < len; i++) {
                var c  = cs[i];
                if(c.doLayout){
                    c.doLayout();
                }
            }
        }
    },

    /**
     * Returns the layout currently in use by the container.  If the container does not currently have a layout
     * set, a default {@link Ext.layout.ContainerLayout} will be created and set as the container's layout.
     * @return {ContainerLayout} layout The container's layout
     */
    getLayout : function(){
        if(!this.layout){
            var layout = new Ext.layout.ContainerLayout(this.layoutConfig);
            this.setLayout(layout);
        }
        return this.layout;
    },

    // private
    beforeDestroy : function(){
        if(this.items){
            Ext.destroy.apply(Ext, this.items.items);
        }
        if(this.monitorResize){
            Ext.EventManager.removeResizeListener(this.doLayout, this);
        }
        if (this.layout && this.layout.destroy) {
            this.layout.destroy();
        }
        Ext.Container.superclass.beforeDestroy.call(this);
    },

    /**
     * Bubbles up the component/container heirarchy, calling the specified function with each component. The scope (<i>this</i>) of
     * function call will be the scope provided or the current component. The arguments to the function
     * will be the args provided or the current component. If the function returns false at any point,
     * the bubble is stopped.
     * @param {Function} fn The function to call
     * @param {Object} scope (optional) The scope of the function (defaults to current node)
     * @param {Array} args (optional) The args to call the function with (default to passing the current component)
     */
    bubble : function(fn, scope, args){
        var p = this;
        while(p){
            if(fn.apply(scope || p, args || [p]) === false){
                break;
            }
            p = p.ownerCt;
        }
    },

    /**
     * Cascades down the component/container heirarchy from this component (called first), calling the specified function with
     * each component. The scope (<i>this</i>) of
     * function call will be the scope provided or the current component. The arguments to the function
     * will be the args provided or the current component. If the function returns false at any point,
     * the cascade is stopped on that branch.
     * @param {Function} fn The function to call
     * @param {Object} scope (optional) The scope of the function (defaults to current component)
     * @param {Array} args (optional) The args to call the function with (defaults to passing the current component)
     */
    cascade : function(fn, scope, args){
        if(fn.apply(scope || this, args || [this]) !== false){
            if(this.items){
                var cs = this.items.items;
                for(var i = 0, len = cs.length; i < len; i++){
                    if(cs[i].cascade){
                        cs[i].cascade(fn, scope, args);
                    }else{
                        fn.apply(scope || cs[i], args || [cs[i]]);
                    }
                }
            }
        }
    },

    /**
     * Find a component under this container at any level by id
     * @param {String} id
     * @return Ext.Component
     */
    findById : function(id){
        var m, ct = this;
        this.cascade(function(c){
            if(ct != c && c.id === id){
                m = c;
                return false;
            }
        });
        return m || null;
    },

    /**
     * Find a component under this container at any level by xtype or class
     * @param {String/Class} xtype The xtype string for a component, or the class of the component directly
     * @param {Boolean} shallow (optional) False to check whether this Component is descended from the xtype (this is
     * the default), or true to check whether this Component is directly of the specified xtype.
     * @return {Array} Array of Ext.Components
     */
    findByType : function(xtype, shallow){
        return this.findBy(function(c){
            return c.isXType(xtype, shallow);
        });
    },

    /**
     * Find a component under this container at any level by property
     * @param {String} prop
     * @param {String} value
     * @return {Array} Array of Ext.Components
     */
    find : function(prop, value){
        return this.findBy(function(c){
            return c[prop] === value;
        });
    },

    /**
     * Find a component under this container at any level by a custom function. If the passed function returns
     * true, the component will be included in the results. The passed function is called with the arguments (component, this container).
     * @param {Function} fcn
     * @param {Object} scope (optional)
     * @return {Array} Array of Ext.Components
     */
    findBy : function(fn, scope){
        var m = [], ct = this;
        this.cascade(function(c){
            if(ct != c && fn.call(scope || c, c, ct) === true){
                m.push(c);
            }
        });
        return m;
    }
});

Ext.Container.LAYOUTS = {};
Ext.reg('container', Ext.Container);