columnmodel.js

Ext JS是一个创建丰富互联网应用程序的跨浏览器的JavaScrip库。它包含：高效率

  return c.hidden;
});
</code></pre>
     * @param {Function} fn
     * @param {Object} scope (optional)
     * @return {Array} result
     */
    getColumnsBy : function(fn, scope){
        var r = [];
        for(var i = 0, len = this.config.length; i < len; i++){
            var c = this.config[i];
            if(fn.call(scope||this, c, i) === true){
                r[r.length] = c;
            }
        }
        return r;
    },

    /**
     * Returns true if the specified column is sortable.
     * @param {Number} col The column index
     * @return {Boolean}
     */
    isSortable : function(col){
        return this.config[col].sortable;
    },

    /**
     * Returns true if the specified column menu is disabled.
     * @param {Number} col The column index
     * @return {Boolean}
     */
    isMenuDisabled : function(col){
        return !!this.config[col].menuDisabled;
    },

    /**
     * Returns the rendering (formatting) function defined for the column.
     * @param {Number} col The column index.
     * @return {Function} The function used to render the cell. See {@link #setRenderer}.
     */
    getRenderer : function(col){
        if(!this.config[col].renderer){
            return Ext.grid.ColumnModel.defaultRenderer;
        }
        return this.config[col].renderer;
    },

    /**
     * Sets the rendering (formatting) function for a column.  See {@link Ext.util.Format} for some
     * default formatting functions.
     * @param {Number} col The column index
     * @param {Function} fn The function to use to process the cell's raw data
     * to return HTML markup for the grid view. The render function is called with
     * the following parameters:<ul>
     * <li><b>value</b> : Object<p class="sub-desc">The data value for the cell.</p></li>
     * <li><b>metadata</b> : Object<p class="sub-desc">An object in which you may set the following attributes:<ul>
     * <li><b>css</b> : String<p class="sub-desc">A CSS class name to add to the cell's TD element.</p></li>
     * <li><b>attr</b> : String<p class="sub-desc">An HTML attribute definition string to apply to the data container element <i>within</i> the table cell
     * (e.g. 'style="color:red;"').</p></li></ul></p></li>
     * <li><b>record</b> : Ext.data.record<p class="sub-desc">The {@link Ext.data.Record} from which the data was extracted.</p></li>
     * <li><b>rowIndex</b> : Number<p class="sub-desc">Row index</p></li>
     * <li><b>colIndex</b> : Number<p class="sub-desc">Column index</p></li>
     * <li><b>store</b> : Ext.data.Store<p class="sub-desc">The {@link Ext.data.Store} object from which the Record was extracted.</p></li></ul>
     */
    setRenderer : function(col, fn){
        this.config[col].renderer = fn;
    },

    /**
     * Returns the width for the specified column.
     * @param {Number} col The column index
     * @return {Number}
     */
    getColumnWidth : function(col){
        return this.config[col].width;
    },

    /**
     * Sets the width for a column.
     * @param {Number} col The column index
     * @param {Number} width The new width
     */
    setColumnWidth : function(col, width, suppressEvent){
        this.config[col].width = width;
        this.totalWidth = null;
        if(!suppressEvent){
             this.fireEvent("widthchange", this, col, width);
        }
    },

    /**
     * Returns the total width of all columns.
     * @param {Boolean} includeHidden True to include hidden column widths
     * @return {Number}
     */
    getTotalWidth : function(includeHidden){
        if(!this.totalWidth){
            this.totalWidth = 0;
            for(var i = 0, len = this.config.length; i < len; i++){
                if(includeHidden || !this.isHidden(i)){
                    this.totalWidth += this.getColumnWidth(i);
                }
            }
        }
        return this.totalWidth;
    },

    /**
     * Returns the header for the specified column.
     * @param {Number} col The column index
     * @return {String}
     */
    getColumnHeader : function(col){
        return this.config[col].header;
    },

    /**
     * Sets the header for a column.
     * @param {Number} col The column index
     * @param {String} header The new header
     */
    setColumnHeader : function(col, header){
        this.config[col].header = header;
        this.fireEvent("headerchange", this, col, header);
    },

    /**
     * Returns the tooltip for the specified column.
     * @param {Number} col The column index
     * @return {String}
     */
    getColumnTooltip : function(col){
            return this.config[col].tooltip;
    },
    /**
     * Sets the tooltip for a column.
     * @param {Number} col The column index
     * @param {String} tooltip The new tooltip
     */
    setColumnTooltip : function(col, tooltip){
            this.config[col].tooltip = tooltip;
    },

    /**
     * Returns the dataIndex for the specified column.
<pre><code>
// Get field name for the column
var fieldName = grid.getColumnModel().getDataIndex(columnIndex);
</code></pre>
     * @param {Number} col The column index
     * @return {String} The column's dataIndex
     */
    getDataIndex : function(col){
        return this.config[col].dataIndex;
    },

    /**
     * Sets the dataIndex for a column.
     * @param {Number} col The column index
     * @param {String} dataIndex The new dataIndex
     */
    setDataIndex : function(col, dataIndex){
        this.config[col].dataIndex = dataIndex;
    },

    /**
     * Finds the index of the first matching column for the given dataIndex.
     * @param {String} col The dataIndex to find
     * @return {Number} The column index, or -1 if no match was found
     */
    findColumnIndex : function(dataIndex){
        var c = this.config;
        for(var i = 0, len = c.length; i < len; i++){
            if(c[i].dataIndex == dataIndex){
                return i;
            }
        }
        return -1;
    },

    /**
     * Returns true if the cell is editable.
<pre><code>
var store = new Ext.data.Store({...});
var colModel = new Ext.grid.ColumnModel({
  columns: [...],
  isCellEditable: function(col, row) {
    var record = store.getAt(row);
    if (record.get('readonly')) { // replace with your condition
      return false;
    }
    return Ext.grid.ColumnModel.prototype.isCellEditable.call(this, col, row);
  }
});
var grid = new Ext.grid.GridPanel({
  store: store,
  colModel: colModel,
  ...
});
</code></pre>
     * @param {Number} colIndex The column index
     * @param {Number} rowIndex The row index
     * @return {Boolean}
     */
    isCellEditable : function(colIndex, rowIndex){
        return (this.config[colIndex].editable || (typeof this.config[colIndex].editable == "undefined" && this.config[colIndex].editor)) ? true : false;
    },

    /**
     * Returns the editor defined for the cell/column.
     * @param {Number} colIndex The column index
     * @param {Number} rowIndex The row index
     * @return {Ext.Editor} The {@link Ext.Editor Editor} that was created to wrap
     * the {@link Ext.form.Field Field} used to edit the cell.
     */
    getCellEditor : function(colIndex, rowIndex){
        return this.config[colIndex].getCellEditor(rowIndex);
    },

    /**
     * Sets if a column is editable.
     * @param {Number} col The column index
     * @param {Boolean} editable True if the column is editable
     */
    setEditable : function(col, editable){
        this.config[col].editable = editable;
    },


    /**
     * Returns true if the column is hidden.
     * @param {Number} colIndex The column index
     * @return {Boolean}
     */
    isHidden : function(colIndex){
        return this.config[colIndex].hidden;
    },


    /**
     * Returns true if the column width cannot be changed
     */
    isFixed : function(colIndex){
        return this.config[colIndex].fixed;
    },

    /**
     * Returns true if the column can be resized
     * @return {Boolean}
     */
    isResizable : function(colIndex){
        return colIndex >= 0 && this.config[colIndex].resizable !== false && this.config[colIndex].fixed !== true;
    },
    /**
     * Sets if a column is hidden.
<pre><code>
myGrid.getColumnModel().setHidden(0, true); // hide column 0 (0 = the first column).  
</code></pre>
     * @param {Number} colIndex The column index
     * @param {Boolean} hidden True if the column is hidden
     */
    setHidden : function(colIndex, hidden){
        var c = this.config[colIndex];
        if(c.hidden !== hidden){
            c.hidden = hidden;
            this.totalWidth = null;
            this.fireEvent("hiddenchange", this, colIndex, hidden);
        }
    },

    /**
     * Sets the editor for a column and destroys the prior editor.
     * @param {Number} col The column index
     * @param {Object} editor The editor object
     */
    setEditor : function(col, editor){
        Ext.destroy(this.config[col].editor);
        this.config[col].editor = editor;
    },
    
    /**
     * Destroys this the column model by purging any event listeners, and removing any editors.
     */
    destroy : function(){
        var c = this.config;
        for(var i = 0, c = this.config, len = c.length; i < len; i++){
            Ext.destroy(c[i].editor);
        }
        this.purgeListeners();
    }
});

// private
Ext.grid.ColumnModel.defaultRenderer = function(value){
    if(typeof value == "string" && value.length < 1){
        return "&#160;";
    }
    return value;
};