columnmodel.js

ext js demo ext学习资料

/*
 * Ext JS Library 1.1 RC 1
 * Copyright(c) 2006-2007, Ext JS, LLC.
 * [e-mail]
 * 
 * http://www.extjs.com/license
 */

/**
 * @class Ext.grid.ColumnModel
 * @extends Ext.util.Observable
 * This is the default implementation of a ColumnModel used by the Grid. It defines
 * the columns in the grid.
 * <br>Usage:<br>
 <pre><code>
 var colModel = new Ext.grid.ColumnModel([
	{header: "Ticker", width: 60, sortable: true, locked: true},
	{header: "Company Name", width: 150, sortable: true},
	{header: "Market Cap.", width: 100, sortable: true},
	{header: "$ Sales", width: 100, sortable: true, renderer: money},
	{header: "Employees", width: 100, sortable: true, resizable: false}
 ]);
 </code></pre>
 * <p>
 * The config options listed for this class are options which may appear in each
 * individual column definition.
 * @constructor
 * @param {Object} config An Array of column config objects. See this class's
 * config objects for details.
*/
Ext.grid.ColumnModel = function(config){
	/**
     * The config passed into the constructor
     */
    this.config = config;
    this.lookup = {};

    // if no id, create one
    // if the column does not have a dataIndex mapping,
    // map it to the order it is in the config
    for(var i = 0, len = config.length; i < len; i++){
        var c = config[i];
        if(typeof c.dataIndex == "undefined"){
            c.dataIndex = i;
        }
        if(typeof c.renderer == "string"){
            c.renderer = Ext.util.Format[c.renderer];
        }
        if(typeof c.id == "undefined"){
            c.id = i;
        }
        if(c.editor && c.editor.isFormField){
            c.editor = new Ext.grid.GridEditor(c.editor);
        }
        this.lookup[c.id] = c;
    }

    /**
     * The width of columns which have no width specified (defaults to 100)
     * @type Number
     */
    this.defaultWidth = 100;

    /**
     * Default sortable of columns which have no sortable specified (defaults to false)
     * @type Boolean
     */
    this.defaultSortable = false;

    this.addEvents({
        /**
	     * @event widthchange
	     * Fires when the width of a column changes.
	     * @param {ColumnModel} this
	     * @param {Number} columnIndex The column index
	     * @param {Number} newWidth The new width
	     */
	    "widthchange": true,
        /**
	     * @event headerchange
	     * Fires when the text of a header changes.
	     * @param {ColumnModel} this
	     * @param {Number} columnIndex The column index
	     * @param {Number} newText The new header text
	     */
	    "headerchange": true,
        /**
	     * @event hiddenchange
	     * Fires when a column is hidden or "unhidden".
	     * @param {ColumnModel} this
	     * @param {Number} columnIndex The column index
	     * @param {Boolean} hidden true if hidden, false otherwise
	     */
	    "hiddenchange": true,
	    /**
         * @event columnmoved
         * Fires when a column is moved.
         * @param {ColumnModel} this
         * @param {Number} oldIndex
         * @param {Number} newIndex
         */
        "columnmoved" : true,
        /**
         * @event columlockchange
         * Fires when a column's locked state is changed
         * @param {ColumnModel} this
         * @param {Number} colIndex
         * @param {Boolean} locked true if locked
         */
        "columnlockchange" : true
    });
    Ext.grid.ColumnModel.superclass.constructor.call(this);
};
Ext.extend(Ext.grid.ColumnModel, Ext.util.Observable, {
    /**
     * @cfg {String} header The header text to display in the Grid view.
     */
    /**
     * @cfg {String} dataIndex (Optional) The name of the field in the grid's {@link Ext.data.Store}'s
     * {@link Ext.data.Record} definition from which to draw the column's value. If not
     * specified, the column's index is used as an index into the Record's data Array.
     */
    /**
     * @cfg {Number} width (Optional) The initial width in pixels of the column. Using this
     * instead of {@link Ext.grid.Grid#autoSizeColumns} is more efficient.
     */
    /**
     * @cfg {Boolean} sortable (Optional) True if sorting is to be allowed on this column. Defaults to true.
     * Whether local/remote sorting is used is specified in {@link Ext.data.Store#remoteSort}.
     */
    /**
     * @cfg {Boolean} locked (Optional) True to lock the column in place while scrolling the Grid.
     * Defaults to false.
     */
    /**
     * @cfg {Boolean} resizable (Optional) False to disable column resizing. Defaults to true.
     */
    /**
     * @cfg {Boolean} hidden (Optional) True to hide the column. Defaults to false.
     */
    /**
     * @cfg {Function} renderer (Optional) A function used to generate HTML markup for a cell
     * given the cell's data value. See {@link #setRenderer}. If not specified, the
     * default renderer uses the raw data value.
     */
    /**
     * @cfg {String} align (Optional) Set the CSS text-align property of the column.  Defaults to undefined.
     */

    /**
     * Returns the id of the column at the specified index.
     * @param {Number} index The column index
     * @return {String} the id
     */
    getColumnId : function(index){
        return this.config[index].id;
    },

    /**
     * Returns the column for a specified id.
     * @param {String} id The column id
     * @return {Object} the column
     */
    getColumnById : function(id){
        return this.lookup[id];
    },

    /**
     * Returns the index for a specified column id.
     * @param {String} id The column id
     * @return {Number} the index, or -1 if not found
     */
    getIndexById : function(id){
        for(var i = 0, len = this.config.length; i < len; i++){
            if(this.config[i].id == id){
                return i;
            }
        }
        return -1;
    },

    moveColumn : function(oldIndex, newIndex){
        var c = this.config[oldIndex];
        this.config.splice(oldIndex, 1);
        this.config.splice(newIndex, 0, c);
        this.dataMap = null;
        this.fireEvent("columnmoved", this, oldIndex, newIndex);
    },

    isLocked : function(colIndex){
        return this.config[colIndex].locked === true;
    },

    setLocked : function(colIndex, value, suppressEvent){
        if(this.isLocked(colIndex) == value){
            return;
        }
        this.config[colIndex].locked = value;
        if(!suppressEvent){
            this.fireEvent("columnlockchange", this, colIndex, value);
        }
    },

    getTotalLockedWidth : function(){
        var totalWidth = 0;
        for(var i = 0; i < this.config.length; i++){
            if(this.isLocked(i) && !this.isHidden(i)){
                this.totalWidth += this.getColumnWidth(i);
            }
        }
        return totalWidth;
    },

    getLockedCount : function(){
        for(var i = 0, len = this.config.length; i < len; i++){
            if(!this.isLocked(i)){
                return i;
            }
        }
    },

    /**
     * Returns the number of columns.
     * @return {Number}
     */
    getColumnCount : function(visibleOnly){
        if(visibleOnly === true){
            var c = 0;
            for(var i = 0, len = this.config.length; i < len; i++){
                if(!this.isHidden(i)){
                    c++;
                }
            }
            return c;
        }
        return this.config.length;
    },

    /**
     * Returns the column configs that return true by the passed function that is called with (columnConfig, index)
     * @param {Function} fn
     * @param {Object} scope (optional)
     * @return {Array} result