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/**
* @class YAHOO.ext.grid.AbstractColumnModel
* @extends YAHOO.ext.util.Observable
* This abstract class defines the ColumnModel interface and provides default implementations of the events required by the Grid.
* @constructor
*/
YAHOO.ext.grid.AbstractColumnModel = function(){
// legacy events
this.onWidthChange = new YAHOO.util.CustomEvent('widthChanged');
this.onHeaderChange = new YAHOO.util.CustomEvent('headerChanged');
this.onHiddenChange = new YAHOO.util.CustomEvent('hiddenChanged');
this.events = {
/**
* @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': this.onWidthChange,
/**
* @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': this.onHeaderChange,
/**
* @event hiddenchange
* Fires when a column is hidden or "unhidden"
* @param {ColumnModel} this
* @param {Number} columnIndex The column index
* @param {Number} hidden true if hidden, false otherwise
*/
'hiddenchange': this.onHiddenChange
};
};
YAHOO.ext.grid.AbstractColumnModel.prototype = {
fireEvent : YAHOO.ext.util.Observable.prototype.fireEvent,
on : YAHOO.ext.util.Observable.prototype.on,
addListener : YAHOO.ext.util.Observable.prototype.addListener,
delayedListener : YAHOO.ext.util.Observable.prototype.delayedListener,
removeListener : YAHOO.ext.util.Observable.prototype.removeListener,
purgeListeners : YAHOO.ext.util.Observable.prototype.purgeListeners,
bufferedListener : YAHOO.ext.util.Observable.prototype.bufferedListener,
fireWidthChange : function(colIndex, newWidth){
this.onWidthChange.fireDirect(this, colIndex, newWidth);
},
fireHeaderChange : function(colIndex, newHeader){
this.onHeaderChange.fireDirect(this, colIndex, newHeader);
},
fireHiddenChange : function(colIndex, hidden){
this.onHiddenChange.fireDirect(this, colIndex, hidden);
},
/**
* Interface method - Returns the number of columns.
* @return {Number}
*/
getColumnCount : function(){
return 0;
},
/**
* Interface method - Returns true if the specified column is sortable.
* @param {Number} col The column index
* @return {Boolean}
*/
isSortable : function(col){
return false;
},
/**
* Interface method - Returns true if the specified column is hidden.
* @param {Number} col The column index
* @return {Boolean}
*/
isHidden : function(col){
return false;
},
/**
* Interface method - Returns the sorting comparison function defined for the column (defaults to sortTypes.none).
* @param {Number} col The column index
* @return {Function}
*/
getSortType : function(col){
return YAHOO.ext.grid.DefaultColumnModel.sortTypes.none;
},
/**
* Interface method - Returns the rendering (formatting) function defined for the column.
* @param {Number} col The column index
* @return {Function}
*/
getRenderer : function(col){
return YAHOO.ext.grid.DefaultColumnModel.defaultRenderer;
},
/**
* Interface method - Returns the width for the specified column.
* @param {Number} col The column index
* @return {Number}
*/
getColumnWidth : function(col){
return 0;
},
/**
* Interface method - Returns the total width of all columns.
* @return {Number}
*/
getTotalWidth : function(){
return 0;
},
/**
* Interface method - Returns the header for the specified column.
* @param {Number} col The column index
* @return {String}
*/
getColumnHeader : function(col){
return '';
}
};
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