rowselectionmodel.js

一个struts和extjs得源码

    getSelections : function(){
        return [].concat(this.selections.items);
    },

    /**
     * Returns the first selected record.
     * @return {Record}
     */
    getSelected : function(){
        return this.selections.itemAt(0);
    },

    /**
     * Calls the passed function with each selection. If the function returns false, iteration is
     * stopped and this function returns false. Otherwise it returns true.
     * @param {Function} fn
     * @param {Object} scope (optional)
     * @return {Boolean} true if all selections were iterated
     */
    each : function(fn, scope){
        var s = this.getSelections();
        for(var i = 0, len = s.length; i < len; i++){
            if(fn.call(scope || this, s[i], i) === false){
                return false;
            }
        }
        return true;
    },

    /**
     * Clears all selections.
     */
    clearSelections : function(fast){
        if(this.isLocked()) return;
        if(fast !== true){
            var ds = this.grid.store;
            var s = this.selections;
            s.each(function(r){
                this.deselectRow(ds.indexOfId(r.id));
            }, this);
            s.clear();
        }else{
            this.selections.clear();
        }
        this.last = false;
    },


    /**
     * Selects all rows.
     */
    selectAll : function(){
        if(this.isLocked()) return;
        this.selections.clear();
        for(var i = 0, len = this.grid.store.getCount(); i < len; i++){
            this.selectRow(i, true);
        }
    },

    /**
     * Returns True if there is a selection.
     * @return {Boolean}
     */
    hasSelection : function(){
        return this.selections.length > 0;
    },

    /**
     * Returns True if the specified row is selected.
     * @param {Number/Record} record The record or index of the record to check
     * @return {Boolean}
     */
    isSelected : function(index){
        var r = typeof index == "number" ? this.grid.store.getAt(index) : index;
        return (r && this.selections.key(r.id) ? true : false);
    },

    /**
     * Returns True if the specified record id is selected.
     * @param {String} id The id of record to check
     * @return {Boolean}
     */
    isIdSelected : function(id){
        return (this.selections.key(id) ? true : false);
    },

    // private
    handleMouseDown : function(g, rowIndex, e){
        if(e.button !== 0 || this.isLocked()){
            return;
        };
        var view = this.grid.getView();
        if(e.shiftKey && !this.singleSelect && this.last !== false){
            var last = this.last;
            this.selectRange(last, rowIndex, e.ctrlKey);
            this.last = last; // reset the last
            view.focusRow(rowIndex);
        }else{
            var isSelected = this.isSelected(rowIndex);
            if(e.ctrlKey && isSelected){
                this.deselectRow(rowIndex);
            }else if(!isSelected || this.getCount() > 1){
                this.selectRow(rowIndex, e.ctrlKey || e.shiftKey);
                view.focusRow(rowIndex);
            }
        }
    },

    /**
     * Selects multiple rows.
     * @param {Array} rows Array of the indexes of the row to select
     * @param {Boolean} keepExisting (optional) True to keep existing selections (defaults to false)
     */
    selectRows : function(rows, keepExisting){
        if(!keepExisting){
            this.clearSelections();
        }
        for(var i = 0, len = rows.length; i < len; i++){
            this.selectRow(rows[i], true);
        }
    },

    /**
     * Selects a range of rows. All rows in between startRow and endRow are also selected.
     * @param {Number} startRow The index of the first row in the range
     * @param {Number} endRow The index of the last row in the range
     * @param {Boolean} keepExisting (optional) True to retain existing selections
     */
    selectRange : function(startRow, endRow, keepExisting){
        if(this.isLocked()) return;
        if(!keepExisting){
            this.clearSelections();
        }
        if(startRow <= endRow){
            for(var i = startRow; i <= endRow; i++){
                this.selectRow(i, true);
            }
        }else{
            for(var i = startRow; i >= endRow; i--){
                this.selectRow(i, true);
            }
        }
    },

    /**
     * Deselects a range of rows. All rows in between startRow and endRow are also deselected.
     * @param {Number} startRow The index of the first row in the range
     * @param {Number} endRow The index of the last row in the range
     */
    deselectRange : function(startRow, endRow, preventViewNotify){
        if(this.isLocked()) return;
        for(var i = startRow; i <= endRow; i++){
            this.deselectRow(i, preventViewNotify);
        }
    },

    /**
     * Selects a row.
     * @param {Number} row The index of the row to select
     * @param {Boolean} keepExisting (optional) True to keep existing selections
     */
    selectRow : function(index, keepExisting, preventViewNotify){
        if(this.isLocked() || (index < 0 || index >= this.grid.store.getCount()) || this.isSelected(index)) return;
        var r = this.grid.store.getAt(index);
        if(r && this.fireEvent("beforerowselect", this, index, keepExisting, r) !== false){
            if(!keepExisting || this.singleSelect){
                this.clearSelections();
            }
            this.selections.add(r);
            this.last = this.lastActive = index;
            if(!preventViewNotify){
                this.grid.getView().onRowSelect(index);
            }
            this.fireEvent("rowselect", this, index, r);
            this.fireEvent("selectionchange", this);
        }
    },

    /**
     * Deselects a row.
     * @param {Number} row The index of the row to deselect
     */
    deselectRow : function(index, preventViewNotify){
        if(this.isLocked()) return;
        if(this.last == index){
            this.last = false;
        }
        if(this.lastActive == index){
            this.lastActive = false;
        }
        var r = this.grid.store.getAt(index);
        if(r){
            this.selections.remove(r);
            if(!preventViewNotify){
                this.grid.getView().onRowDeselect(index);
            }
            this.fireEvent("rowdeselect", this, index, r);
            this.fireEvent("selectionchange", this);
        }
    },

    // private
    restoreLast : function(){
        if(this._last){
            this.last = this._last;
        }
    },

    // private
    acceptsNav : function(row, col, cm){
        return !cm.isHidden(col) && cm.isCellEditable(col, row);
    },

    // private
    onEditorKey : function(field, e){
        var k = e.getKey(), newCell, g = this.grid, ed = g.activeEditor;
        var shift = e.shiftKey;
        if(k == e.TAB){
            e.stopEvent();
            ed.completeEdit();
            if(shift){
                newCell = g.walkCells(ed.row, ed.col-1, -1, this.acceptsNav, this);
            }else{
                newCell = g.walkCells(ed.row, ed.col+1, 1, this.acceptsNav, this);
            }
        }else if(k == e.ENTER){
            e.stopEvent();
            ed.completeEdit();
			if(this.moveEditorOnEnter !== false){
				if(shift){
					newCell = g.walkCells(ed.row - 1, ed.col, -1, this.acceptsNav, this);
				}else{
					newCell = g.walkCells(ed.row + 1, ed.col, 1, this.acceptsNav, this);
				}
			}
        }else if(k == e.ESC){
            ed.cancelEdit();
        }
        if(newCell){
            g.startEditing(newCell[0], newCell[1]);
        }
    }
});