让Extjs EditorGridPanel 编辑时支持方向键

在用 extjs editorgridpanel 进行输入编辑的时候, 默认情况下只支持使用 tab 键可以实现焦点切换, 如果想让editorgridpanel 在编辑时通过方向键来实现焦点跳转切换，只需加上以下代码：

//让grid支持方向键盘 by liongis@163.com
Ext.override(Ext.grid.CellSelectionModel, {
onEditorKey : function(field, e) {
var smodel = this;
var k = e.getKey(), newCell, g = smodel.grid, ed = g.activeEditor;
switch(k){
case e.TAB:
e.stopEvent();
ed.completeEdit();
if (e.shiftKey) {
newCell = g.walkCells(ed.row, ed.col-1, -1, smodel.acceptsNav, smodel);
} else {
newCell = g.walkCells(ed.row, ed.col+1, 1, smodel.acceptsNav, smodel);
}
if (ed.col == 1) {
if (e.shiftKey) {
newCell = g.walkCells(ed.row, ed.col+1, -1, smodel.acceptsNav, smodel);
} else {
newCell = g.walkCells(ed.row, ed.col+1, 1, smodel.acceptsNav, smodel);
}
}
break;
case e.UP:
e.stopEvent();
ed.completeEdit();
newCell = g.walkCells(ed.row-1, ed.col, -1, smodel.acceptsNav, smodel);
break;
case e.DOWN:
e.stopEvent();
ed.completeEdit();
newCell = g.walkCells(ed.row+1, ed.col, 1, smodel.acceptsNav, smodel);
break;
case e.LEFT:
e.stopEvent();
ed.completeEdit();
newCell = g.walkCells(ed.row, ed.col-1, -1, smodel.acceptsNav, smodel);
break;
case e.RIGHT:
e.stopEvent();
ed.completeEdit();
newCell = g.walkCells(ed.row, ed.col+1, 1, smodel.acceptsNav, smodel);
break;
}
if (newCell) {
g.startEditing(newCell[0], newCell[1]);
}
}
});

注意：这里重写的是：CellSelectionModel ，而不是RowSelectionModel