/*
This file is part of Ext JS 3.4

Copyright (c) 2011-2013 Sencha Inc

Contact:  http://www.sencha.com/contact

GNU General Public License Usage
This file may be used under the terms of the GNU General Public License version 3.0 as
published by the Free Software Foundation and appearing in the file LICENSE included in the
packaging of this file.

Please review the following information to ensure the GNU General Public License version 3.0
requirements will be met: http://www.gnu.org/copyleft/gpl.html.

If you are unsure which license is appropriate for your use, please contact the sales department
at http://www.sencha.com/contact.

Build date: 2013-04-03 15:07:25
*/
/**
 * @class Ext.tree.DefaultSelectionModel
 * @extends Ext.util.Observable
 * The default single selection for a TreePanel.
 */
Ext.tree.DefaultSelectionModel = Ext.extend(Ext.util.Observable, {
    
    constructor : function(config){
        this.selNode = null;
   
        this.addEvents(
            /**
             * @event selectionchange
             * Fires when the selected node changes
             * @param {DefaultSelectionModel} this
             * @param {TreeNode} node the new selection
             */
            'selectionchange',

            /**
             * @event beforeselect
             * Fires before the selected node changes, return false to cancel the change
             * @param {DefaultSelectionModel} this
             * @param {TreeNode} newNode the new selection
             * @param {TreeNode} oldNode the old selection
             */
            'beforeselect'
        );

        Ext.apply(this, config);
        Ext.tree.DefaultSelectionModel.superclass.constructor.call(this);    
    },
    
    init : function(tree){
        this.tree = tree;
        tree.mon(tree.getTreeEl(), 'keydown', this.onKeyDown, this);
        tree.on('click', this.onNodeClick, this);
    },
    
    onNodeClick : function(node, e){
        this.select(node);
    },
    
    /**
     * Select a node.
     * @param {TreeNode} node The node to select
     * @return {TreeNode} The selected node
     */
    select : function(node, /* private*/ selectNextNode){
        // If node is hidden, select the next node in whatever direction was being moved in.
        if (!Ext.fly(node.ui.wrap).isVisible() && selectNextNode) {
            return selectNextNode.call(this, node);
        }
        var last = this.selNode;
        if(node == last){
            node.ui.onSelectedChange(true);
        }else if(this.fireEvent('beforeselect', this, node, last) !== false){
            if(last && last.ui){
                last.ui.onSelectedChange(false);
            }
            this.selNode = node;
            node.ui.onSelectedChange(true);
            this.fireEvent('selectionchange', this, node, last);
        }
        return node;
    },
    
    /**
     * Deselect a node.
     * @param {TreeNode} node The node to unselect
     * @param {Boolean} silent True to stop the selectionchange event from firing.
     */
    unselect : function(node, silent){
        if(this.selNode == node){
            this.clearSelections(silent);
        }    
    },
    
    /**
     * Clear all selections
     * @param {Boolean} silent True to stop the selectionchange event from firing.
     */
    clearSelections : function(silent){
        var n = this.selNode;
        if(n){
            n.ui.onSelectedChange(false);
            this.selNode = null;
            if(silent !== true){
                this.fireEvent('selectionchange', this, null);
            }
        }
        return n;
    },
    
    /**
     * Get the selected node
     * @return {TreeNode} The selected node
     */
    getSelectedNode : function(){
        return this.selNode;    
    },
    
    /**
     * Returns true if the node is selected
     * @param {TreeNode} node The node to check
     * @return {Boolean}
     */
    isSelected : function(node){
        return this.selNode == node;  
    },

    /**
     * Selects the node above the selected node in the tree, intelligently walking the nodes
     * @return TreeNode The new selection
     */
    selectPrevious : function(/* private */ s){
        if(!(s = s || this.selNode || this.lastSelNode)){
            return null;
        }
        // Here we pass in the current function to select to indicate the direction we're moving
        var ps = s.previousSibling;
        if(ps){
            if(!ps.isExpanded() || ps.childNodes.length < 1){
                return this.select(ps, this.selectPrevious);
            } else{
                var lc = ps.lastChild;
                while(lc && lc.isExpanded() && Ext.fly(lc.ui.wrap).isVisible() && lc.childNodes.length > 0){
                    lc = lc.lastChild;
                }
                return this.select(lc, this.selectPrevious);
            }
        } else if(s.parentNode && (this.tree.rootVisible || !s.parentNode.isRoot)){
            return this.select(s.parentNode, this.selectPrevious);
        }
        return null;
    },

    /**
     * Selects the node above the selected node in the tree, intelligently walking the nodes
     * @return TreeNode The new selection
     */
    selectNext : function(/* private */ s){
        if(!(s = s || this.selNode || this.lastSelNode)){
            return null;
        }
        // Here we pass in the current function to select to indicate the direction we're moving
        if(s.firstChild && s.isExpanded() && Ext.fly(s.ui.wrap).isVisible()){
             return this.select(s.firstChild, this.selectNext);
         }else if(s.nextSibling){
             return this.select(s.nextSibling, this.selectNext);
         }else if(s.parentNode){
            var newS = null;
            s.parentNode.bubble(function(){
                if(this.nextSibling){
                    newS = this.getOwnerTree().selModel.select(this.nextSibling, this.selectNext);
                    return false;
                }
            });
            return newS;
         }
        return null;
    },

    onKeyDown : function(e){
        var s = this.selNode || this.lastSelNode;
        // undesirable, but required
        var sm = this;
        if(!s){
            return;
        }
        var k = e.getKey();
        switch(k){
             case e.DOWN:
                 e.stopEvent();
                 this.selectNext();
             break;
             case e.UP:
                 e.stopEvent();
                 this.selectPrevious();
             break;
             case e.RIGHT:
                 e.preventDefault();
                 if(s.hasChildNodes()){
                     if(!s.isExpanded()){
                         s.expand();
                     }else if(s.firstChild){
                         this.select(s.firstChild, e);
                     }
                 }
             break;
             case e.LEFT:
                 e.preventDefault();
                 if(s.hasChildNodes() && s.isExpanded()){
                     s.collapse();
                 }else if(s.parentNode && (this.tree.rootVisible || s.parentNode != this.tree.getRootNode())){
                     this.select(s.parentNode, e);
                 }
             break;
        };
    }
});

/**
 * @class Ext.tree.MultiSelectionModel
 * @extends Ext.util.Observable
 * Multi selection for a TreePanel.
 */
Ext.tree.MultiSelectionModel = Ext.extend(Ext.util.Observable, {
    
    constructor : function(config){
        this.selNodes = [];
        this.selMap = {};
        this.addEvents(
            /**
             * @event selectionchange
             * Fires when the selected nodes change
             * @param {MultiSelectionModel} this
             * @param {Array} nodes Array of the selected nodes
             */
            'selectionchange'
        );
        Ext.apply(this, config);
        Ext.tree.MultiSelectionModel.superclass.constructor.call(this);    
    },
    
    init : function(tree){
        this.tree = tree;
        tree.mon(tree.getTreeEl(), 'keydown', this.onKeyDown, this);
        tree.on('click', this.onNodeClick, this);
    },
    
    onNodeClick : function(node, e){
        if(e.ctrlKey && this.isSelected(node)){
            this.unselect(node);
        }else{
            this.select(node, e, e.ctrlKey);
        }
    },
    
    /**
     * Select a node.
     * @param {TreeNode} node The node to select
     * @param {EventObject} e (optional) An event associated with the selection
     * @param {Boolean} keepExisting (optional) True to retain existing selections
     * @return {TreeNode} The selected node
     */
    select : function(node, e, keepExisting){
        if(keepExisting !== true){
            this.clearSelections(true);
        }
        if(this.isSelected(node)){
            this.lastSelNode = node;
            return node;
        }
        this.selNodes.push(node);
        this.selMap[node.id] = node;
        this.lastSelNode = node;
        node.ui.onSelectedChange(true);
        this.fireEvent('selectionchange', this, this.selNodes);
        return node;
    },
    
    /**
     * Deselect a node.
     * @param {TreeNode} node The node to unselect
     */
    unselect : function(node){
        if(this.selMap[node.id]){
            node.ui.onSelectedChange(false);
            var sn = this.selNodes;
            var index = sn.indexOf(node);
            if(index != -1){
                this.selNodes.splice(index, 1);
            }
            delete this.selMap[node.id];
            this.fireEvent('selectionchange', this, this.selNodes);
        }
    },
    
    /**
     * Clear all selections
     */
    clearSelections : function(suppressEvent){
        var sn = this.selNodes;
        if(sn.length > 0){
            for(var i = 0, len = sn.length; i < len; i++){
                sn[i].ui.onSelectedChange(false);
            }
            this.selNodes = [];
            this.selMap = {};
            if(suppressEvent !== true){
                this.fireEvent('selectionchange', this, this.selNodes);
            }
        }
    },
    
    /**
     * Returns true if the node is selected
     * @param {TreeNode} node The node to check
     * @return {Boolean}
     */
    isSelected : function(node){
        return this.selMap[node.id] ? true : false;  
    },
    
    /**
     * Returns an array of the selected nodes
     * @return {Array}
     */
    getSelectedNodes : function(){
        return this.selNodes.concat([]);
    },

    onKeyDown : Ext.tree.DefaultSelectionModel.prototype.onKeyDown,

    selectNext : Ext.tree.DefaultSelectionModel.prototype.selectNext,

    selectPrevious : Ext.tree.DefaultSelectionModel.prototype.selectPrevious
});