我在为Datagrid实施双击处理程序时遇到问题。我已经找到了在堆栈溢出上发布的解决方案,该解决方案应该可以解决我的问题,但是我无法确定:
1. How exactly do I implement it?
2. What is <T>?
我收到各种我不明白的错误。问题几乎可以肯定是我添加CellPreviewHandler的方式(第6行)
错误(第6和8行)
-类型new CellPreviewEvent.Handler(){}必须实现继承的抽象方法CellPreviewEvent.Handler.onCellPreview(CellPreviewEvent)
-类型为新AsynCallBack(String [] []>(){}类型的onCellPreview(CellPreviewEvent)方法必须重写或实现超类型方法
我的代码:
Public Class DataGrid extends Widget{
Timer singleClickTimer;
int clickCount = 0;
int clickDelay = 300;
myDataTable = new DataGrid<String[]>(result.length, resources, KEY_PROVIDER);
myDataTable.addCellPreviewHandler(new Handler<T>(){
@Override
public void onCellPreview(final CellPreviewEvent<T> event) {
if (Event.getTypeInt(event.getNativeEvent().getType()) == Event.ONMOUSEOVER) {
handleOnMouseOver(event);
} else if (Event.getTypeInt(event.getNativeEvent().getType()) == Event.ONCLICK) {
clickCount++;
if (clickCount == 1) {
singleClickTimer = new Timer() {
@Override
public void run() {
clickCount = 0;
handleOnClick(event);
}
};
singleClickTimer.schedule(clickDelay);
} else if (clickCount == 2) {
singleClickTimer.cancel();
clickCount = 0;
handleOnDblClick(event);
}
}
}
});
private void handleOnMouseOver(CellPreviewEvent<T> event) {
Element cell = event.getNativeEvent().getEventTarget().cast();
GWT.log("mouse over event");
}
private void handleOnClick(CellPreviewEvent<T> event) {
Element cell = event.getNativeEvent().getEventTarget().cast();
GWT.log("click event");
}
private void handleOnDblClick(CellPreviewEvent<T> event) {
Element cell = event.getNativeEvent().getEventTarget().cast();
GWT.log("double click event");
}
链接到原始解决方案:
adding Double click event in CellTable cell - GWT
最佳答案
这不是一个很好的代码(更好的选择是扩展DataGrid类),但是如果您不想做太多更改,只需将<T>
替换为<String[]>
。