mes/WebContent/resource/ux/DataView/Draggable.js

/*

This file is part of Ext JS 4

Copyright (c) 2011 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.

*/
/**
 * @class Ext.ux.DataView.Draggable
 * @extends Object
 * @author Ed Spencer
 *
<pre><code>
Ext.create('Ext.view.View', {
    mixins: {
        draggable: 'Ext.ux.DataView.Draggable'
    },

    initComponent: function() {
        this.mixins.draggable.init(this, {
            ddConfig: {
                ddGroup: 'someGroup'
            }
        });

        this.callParent(arguments);
    }
});
</code></pre>
 *
 */
Ext.define('Ext.ux.DataView.Draggable', {
    requires: 'Ext.dd.DragZone',

    /**
     * @cfg {String} ghostCls The CSS class added to the outermost element of the created ghost proxy
     * (defaults to 'x-dataview-draggable-ghost')
     */
    ghostCls: 'x-dataview-draggable-ghost',

    /**
     * @cfg {Ext.XTemplate/Array} ghostTpl The template used in the ghost DataView
     */
    ghostTpl: [
        '<tpl for=".">',
            '{title}',
        '</tpl>'
    ],

    /**
     * @cfg {Object} ddConfig Config object that is applied to the internally created DragZone
     */

    /**
     * @cfg {String} ghostConfig Config object that is used to configure the internally created DataView
     */

    init: function(dataview, config) {
        /**
         * @property dataview
         * @type Ext.view.View
         * The Ext.view.View instance that this DragZone is attached to
         */
        this.dataview = dataview;

        dataview.on('render', this.onRender, this);

        Ext.apply(this, {
            itemSelector: dataview.itemSelector,
            ghostConfig : {}
        }, config || {});

        Ext.applyIf(this.ghostConfig, {
            itemSelector: 'img',
            cls: this.ghostCls,
            tpl: this.ghostTpl
        });
    },

    /**
     * @private
     * Called when the attached DataView is rendered. Sets up the internal DragZone
     */
    onRender: function() {
        var config = Ext.apply({}, this.ddConfig || {}, {
            dvDraggable: this,
            dataview   : this.dataview,
            getDragData: this.getDragData,
            getTreeNode: this.getTreeNode,
            afterRepair: this.afterRepair,
            getRepairXY: this.getRepairXY
        });

        /**
         * @property dragZone
         * @type Ext.dd.DragZone
         * The attached DragZone instane
         */
        this.dragZone = Ext.create('Ext.dd.DragZone', this.dataview.getEl(), config);
    },

    getDragData: function(e) {
        var draggable = this.dvDraggable,
            dataview  = this.dataview,
            selModel  = dataview.getSelectionModel(),
            target    = e.getTarget(draggable.itemSelector),
            selected, dragData;

        if (target) {
            if (!dataview.isSelected(target)) {
                selModel.select(dataview.getRecord(target));
            }

            selected = dataview.getSelectedNodes();
            dragData = {
                copy: true,
                nodes: selected,
                records: selModel.getSelection(),
                item: true
            };

            if (selected.length == 1) {
                dragData.single = true;
                dragData.ddel = target;
            } else {
                dragData.multi = true;
                dragData.ddel = draggable.prepareGhost(selModel.getSelection()).dom;
            }

            return dragData;
        }

        return false;
    },

    getTreeNode: function() {
        // console.log('test');
    },

    afterRepair: function() {
        this.dragging = false;

        var nodes  = this.dragData.nodes,
            length = nodes.length,
            i;

        //FIXME: Ext.fly does not work here for some reason, only frames the last node
        for (i = 0; i < length; i++) {
            Ext.get(nodes[i]).frame('#8db2e3', 1);
        }
    },

    /**
     * @private
     * Returns the x and y co-ordinates that the dragged item should be animated back to if it was dropped on an
     * invalid drop target. If we're dragging more than one item we don't animate back and just allow afterRepair
     * to frame each dropped item.
     */
    getRepairXY: function(e) {
        if (this.dragData.multi) {
            return false;
        } else {
            var repairEl = Ext.get(this.dragData.ddel),
                repairXY = repairEl.getXY();

            //take the item's margins and padding into account to make the repair animation line up perfectly
            repairXY[0] += repairEl.getPadding('t') + repairEl.getMargin('t');
            repairXY[1] += repairEl.getPadding('l') + repairEl.getMargin('l');

            return repairXY;
        }
    },

    /**
     * Updates the internal ghost DataView by ensuring it is rendered and contains the correct records
     * @param {Array} records The set of records that is currently selected in the parent DataView
     * @return {Ext.view.View} The Ghost DataView
     */
    prepareGhost: function(records) {
        var ghost = this.createGhost(records),
            store = ghost.store;

        store.removeAll();
        store.add(records);

        return ghost.getEl();
    },

    /**
     * @private
     * Creates the 'ghost' DataView that follows the mouse cursor during the drag operation. This div is usually a
     * lighter-weight representation of just the nodes that are selected in the parent DataView. Delegates the creation
     * of each selected item's element to {@link createGhostElement}
     */
    createGhost: function(records) {
        if (!this.ghost) {
            var ghostConfig = Ext.apply({}, this.ghostConfig, {
                store: Ext.create('Ext.data.Store', {
                    model: records[0].modelName
                })
            });

            this.ghost = Ext.create('Ext.view.View', ghostConfig);

            this.ghost.render(document.createElement('div'));
        }

        return this.ghost;
    }
});