gridview.js

一个struts和extjs得源码

/*
 * Ext JS Library 2.2.1
 * Copyright(c) 2006-2009, Ext JS, LLC.
 * [e-mail]
 * 
 * http://extjs.com/license
 */

/**
 * @class Ext.grid.GridView
 * @extends Ext.util.Observable
 * <p>This class encapsulates the user interface of an {@link Ext.grid.GridPanel}.
 * Methods of this class may be used to access user interface elements to enable
 * special display effects. Do not change the DOM structure of the user interface.</p>
 * <p>This class does not provide ways to manipulate the underlying data. The data
 * model of a Grid is held in an {@link Ext.data.Store}.</p>
 * @constructor
 * @param {Object} config
 */
Ext.grid.GridView = function(config){
    Ext.apply(this, config);
    // These events are only used internally by the grid components
    this.addEvents(
      /**
         * @event beforerowremoved
         * Internal UI Event. Fired before a row is removed.
         * @param {Ext.grid.GridView} view
         * @param {Number} rowIndex The index of the row to be removed.
         * @param {Ext.data.Record} record The Record to be removed
       */
      "beforerowremoved",
      /**
         * @event beforerowsinserted
         * Internal UI Event. Fired before rows are inserted.
         * @param {Ext.grid.GridView} view
         * @param {Number} firstRow The index of the first row to be inserted.
         * @param {Number} lastRow The index of the last row to be inserted.
       */
      "beforerowsinserted",
      /**
         * @event beforerefresh
         * Internal UI Event. Fired before the view is refreshed.
         * @param {Ext.grid.GridView} view
       */
      "beforerefresh",
      /**
         * @event rowremoved
         * Internal UI Event. Fired after a row is removed.
         * @param {Ext.grid.GridView} view
         * @param {Number} rowIndex The index of the row that was removed.
         * @param {Ext.data.Record} record The Record that was removed
       */
      "rowremoved",
      /**
         * @event rowsinserted
         * Internal UI Event. Fired after rows are inserted.
         * @param {Ext.grid.GridView} view
         * @param {Number} firstRow The index of the first inserted.
         * @param {Number} lastRow The index of the last row inserted.
       */
      "rowsinserted",
      /**
         * @event rowupdated
         * Internal UI Event. Fired after a row has been updated.
         * @param {Ext.grid.GridView} view
         * @param {Number} firstRow The index of the row updated.
         * @param {Ext.data.record} record The Record backing the row updated.
       */
      "rowupdated",
      /**
         * @event refresh
         * Internal UI Event. Fired after the GridView's body has been refreshed.
         * @param {Ext.grid.GridView} view
       */
      "refresh"
  );
    Ext.grid.GridView.superclass.constructor.call(this);
};

Ext.extend(Ext.grid.GridView, Ext.util.Observable, {
    /**
     * Override this function to apply custom CSS classes to rows during rendering.  You can also supply custom
     * parameters to the row template for the current row to customize how it is rendered using the <b>rowParams</b>
     * parameter.  This function should return the CSS class name (or empty string '' for none) that will be added
     * to the row's wrapping div.  To apply multiple class names, simply return them space-delimited within the string
     * (e.g., 'my-class another-class').
     * @param {Record} record The {@link Ext.data.Record} corresponding to the current row
     * @param {Number} index The row index
     * @param {Object} rowParams A config object that is passed to the row template during rendering that allows
     * customization of various aspects of a body row, if applicable.  Note that this object will only be applied if
     * {@link #enableRowBody} = true, otherwise it will be ignored. The object may contain any of these properties:<ul>
     * <li><code>body</code> : String <div class="sub-desc">An HTML fragment to be rendered as the cell's body content (defaults to '').</div></li>
     * <li><code>bodyStyle</code> : String <div class="sub-desc">A CSS style string that will be applied to the row's TR style attribute (defaults to '').</div></li>
     * <li><code>cols</code> : Number <div class="sub-desc">The column count to apply to the body row's TD colspan attribute (defaults to the current
     * column count of the grid).</div></li>
     * </ul>
     * @param {Store} store The {@link Ext.data.Store} this grid is bound to
     * @method getRowClass
     * @return {String} a CSS class name to add to the row.
     */
    /**
     * @cfg {Boolean} enableRowBody True to add a second TR element per row that can be used to provide a row body
     * that spans beneath the data row.  Use the {@link #getRowClass} method's rowParams config to customize the row body.
     */
    /**
     * @cfg {String} emptyText Default text to display in the grid body when no rows are available (defaults to '').
     */
    /**
     * @property dragZone
     * @type Ext.grid.GridDragZone
     * <p><b>This will only be present if the owning GridPanel was configured with {@link Ext.grid.GridPanel#enableDragDrop enableDragDrop} <tt>true</tt>.</b></p>
     * <p><b>This will only be present after the owning GridPanel has been rendered</b>.</p>
     * <p>A customized implementation of a {@link Ext.dd.DragZone DragZone} which provides default implementations of the
     * template methods of DragZone to enable dragging of the selected rows of a GridPanel. See {@link Ext.grid.GridDragZone} for details.</p>
     */
    /**
     * @cfg {Boolean} deferEmptyText True to defer emptyText being applied until the store's first load
     */
    deferEmptyText: true,
    /**
     * The amount of space to reserve for the scrollbar (defaults to 19 pixels)
     * @type Number
     */
    scrollOffset: 19,
    /**
     * @cfg {Boolean} autoFill True to auto expand the columns to fit the grid <b>when the grid is created</b>.
     */
    autoFill: false,
    /**
     * @cfg {Boolean} forceFit True to auto expand/contract the size of the columns to fit the grid width and prevent horizontal scrolling.
     * This option overrides any (@link Ext.grid.ColumnModel#width width} settings in the ColumnModel.
     */
    forceFit: false,
    /**
     * The CSS classes applied to a header when it is sorted. (defaults to ["sort-asc", "sort-desc"])
     * @type Array
     */
    sortClasses : ["sort-asc", "sort-desc"],
    /**
     * The text displayed in the "Sort Ascending" menu item
     * @type String
     */
    sortAscText : "Sort Ascending",
    /**
     * The text displayed in the "Sort Descending" menu item
     * @type String
     */
    sortDescText : "Sort Descending",
    /**
     * The text displayed in the "Columns" menu item
     * @type String
     */
    columnsText : "Columns",

    // private
    borderWidth: 2,
    tdClass: 'x-grid3-cell',
    hdCls: 'x-grid3-hd',

    /**
     * @cfg {Number} cellSelectorDepth The number of levels to search for cells in event delegation (defaults to 4)
     */
    cellSelectorDepth: 4,
    /**
     * @cfg {Number} rowSelectorDepth The number of levels to search for rows in event delegation (defaults to 10)
     */
    rowSelectorDepth: 10,

    /**
     * @cfg {String} cellSelector The selector used to find cells internally
     */
    cellSelector: 'td.x-grid3-cell',
    /**
     * @cfg {String} rowSelector The selector used to find rows internally
     */
    rowSelector: 'div.x-grid3-row',

    /* -------------------------------- UI Specific ----------------------------- */

    // private
    initTemplates : function(){
        var ts = this.templates || {};
        if(!ts.master){
            ts.master = new Ext.Template(
                    '<div class="x-grid3" hidefocus="true">',
                        '<div class="x-grid3-viewport">',
                            '<div class="x-grid3-header"><div class="x-grid3-header-inner"><div class="x-grid3-header-offset">{header}</div></div><div class="x-clear"></div></div>',
                            '<div class="x-grid3-scroller"><div class="x-grid3-body">{body}</div><a href="#" class="x-grid3-focus" tabIndex="-1"></a></div>',
                        "</div>",
                        '<div class="x-grid3-resize-marker">&#160;</div>',
                        '<div class="x-grid3-resize-proxy">&#160;</div>',
                    "</div>"
                    );
        }

        if(!ts.header){
            ts.header = new Ext.Template(
                    '<table border="0" cellspacing="0" cellpadding="0" style="{tstyle}">',
                    '<thead><tr class="x-grid3-hd-row">{cells}</tr></thead>',
                    "</table>"
                    );
        }

        if(!ts.hcell){
            ts.hcell = new Ext.Template(
                    '<td class="x-grid3-hd x-grid3-cell x-grid3-td-{id} {css}" style="{style}"><div {tooltip} {attr} class="x-grid3-hd-inner x-grid3-hd-{id}" unselectable="on" style="{istyle}">', this.grid.enableHdMenu ? '<a class="x-grid3-hd-btn" href="#"></a>' : '',
                    '{value}<img class="x-grid3-sort-icon" src="', Ext.BLANK_IMAGE_URL, '" />',
                    "</div></td>"
                    );
        }

        if(!ts.body){
            ts.body = new Ext.Template('{rows}');
        }

        if(!ts.row){
            ts.row = new Ext.Template(
                    '<div class="x-grid3-row {alt}" style="{tstyle}"><table class="x-grid3-row-table" border="0" cellspacing="0" cellpadding="0" style="{tstyle}">',
                    '<tbody><tr>{cells}</tr>',
                    (this.enableRowBody ? '<tr class="x-grid3-row-body-tr" style="{bodyStyle}"><td colspan="{cols}" class="x-grid3-body-cell" tabIndex="0" hidefocus="on"><div class="x-grid3-row-body">{body}</div></td></tr>' : ''),
                    '</tbody></table></div>'
                    );
        }

        if(!ts.cell){
            ts.cell = new Ext.Template(
                    '<td class="x-grid3-col x-grid3-cell x-grid3-td-{id} {css}" style="{style}" tabIndex="0" {cellAttr}>',
                    '<div class="x-grid3-cell-inner x-grid3-col-{id}" unselectable="on" {attr}>{value}</div>',
                    "</td>"
                    );
        }

        for(var k in ts){
            var t = ts[k];
            if(t && typeof t.compile == 'function' && !t.compiled){
                t.disableFormats = true;
                t.compile();
            }
        }

        this.templates = ts;
        this.colRe = new RegExp("x-grid3-td-([^\\s]+)", "");
    },

    // private
    fly : function(el){
        if(!this._flyweight){
            this._flyweight = new Ext.Element.Flyweight(document.body);
        }
        this._flyweight.dom = el;
        return this._flyweight;
    },

    // private
    getEditorParent : function(){
        return this.scroller.dom;
    },

    // private
    initElements : function(){
        var E = Ext.Element;

        var el = this.grid.getGridEl().dom.firstChild;
        var cs = el.childNodes;

        this.el = new E(el);

        this.mainWrap = new E(cs[0]);
        this.mainHd = new E(this.mainWrap.dom.firstChild);

        if(this.grid.hideHeaders){
            this.mainHd.setDisplayed(false);
        }

        this.innerHd = this.mainHd.dom.firstChild;
        this.scroller = new E(this.mainWrap.dom.childNodes[1]);
        if(this.forceFit){
            this.scroller.setStyle('overflow-x', 'hidden');
        }
        /**
         * The GridView's body Element which encapsulates all rows in the Grid. {@link Ext.Element Element}. Read-only.
         * <p>This Element is only available after the GridPanel has been rendered.</p>
         * @type Ext.Element
         * @property mainBody
         */
        this.mainBody = new E(this.scroller.dom.firstChild);

        this.focusEl = new E(this.scroller.dom.childNodes[1]);
        this.focusEl.swallowEvent("click", true);

        this.resizeMarker = new E(cs[1]);
        this.resizeProxy = new E(cs[2]);
    },

    // private
    getRows : function(){
        return this.hasRows() ? this.mainBody.dom.childNodes : [];
    },

    // finder methods, used with delegation

    // private
    findCell : function(el){
        if(!el){
            return false;
        }
        return this.fly(el).findParent(this.cellSelector, this.cellSelectorDepth);
    },

    // private
    findCellIndex : function(el, requiredCls){
        var cell = this.findCell(el);
        if(cell && (!requiredCls || this.fly(cell).hasClass(requiredCls))){
            return this.getCellIndex(cell);
        }
        return false;
    },

    // private
    getCellIndex : function(el){
        if(el){
            var m = el.className.match(this.colRe);
            if(m && m[1]){
                return this.cm.getIndexById(m[1]);
            }
        }
        return false;
    },

    // private
    findHeaderCell : function(el){
        var cell = this.findCell(el);
        return cell && this.fly(cell).hasClass(this.hdCls) ? cell : null;
    },

    // private
    findHeaderIndex : function(el){
        return this.findCellIndex(el, this.hdCls);
    },

/**
 * Return the HtmlElement representing the grid row which contains the passed element.
 * @param {Element} el The target element
 * @return The row element, or null if the target element is not within a row of this GridView.
 */
    findRow : function(el){
        if(!el){
            return false;
        }
        return this.fly(el).findParent(this.rowSelector, this.rowSelectorDepth);
    },

/**
 * Return the index of the grid row which contains the passed element.
 * @param {Element} el The target element
 * @return The row index, or <b>false</b> if the target element is not within a row of this GridView.
 */
    findRowIndex : function(el){
        var r = this.findRow(el);
        return r ? r.rowIndex : false;
    },

    // getter methods for fetching elements dynamically in the grid

/**
 * Return the &lt;TR> HtmlElement which represents a Grid row for the specified index.
 * @param {Number} index The row index
 * @return {HtmlElement} The &lt;TR> element.
 */
    getRow : function(row){
        return this.getRows()[row];
    },

/**
 * Returns the grid's &lt;TD> HtmlElement at the specified coordinates.
 * @param {Number} row The row index in which to find the cell.
 * @param {Number} col The column index of the cell.
 * @return {HtmlElement} The &lt;TD> at the specified coordinates.
 */
    getCell : function(row, col){
        return this.getRow(row).getElementsByTagName('td')[col];
    },

/**
 * Return the &lt;TD> HtmlElement which represents the Grid's header cell for the specified column index.
 * @param {Number} index The column index
 * @return {HtmlElement} The &lt;TD> element.
 */
    getHeaderCell : function(index){
      return this.mainHd.dom.getElementsByTagName('td')[index];
    },

    // manipulating elements

    // private - use getRowClass to apply custom row classes
    addRowClass : function(row, cls){
        var r = this.getRow(row);
        if(r){
            this.fly(r).addClass(cls);
        }
    },

    // private
    removeRowClass : function(row, cls){
        var r = this.getRow(row);
        if(r){
            this.fly(r).removeClass(cls);
        }
    },

    // private
    removeRow : function(row){
        Ext.removeNode(this.getRow(row));
        this.syncFocusEl(row);
    },