CODEWITHSUNDEEP
javaeclipsegwtdatagridevent-handling
TheJavaBeast
TheJavaBeast

Reputation: 163

Double click event not working- DataGrid - GWT

I am having an issue implementing a double click handler for my Datagrid. I have found a solution posted on Stack overflow that should fix my problem i believe, however, I can not figure out:

1. How exactly do I implement it?
2. What is <T>?

I am getting various errors I do not understand. The issue is almost certainly with the way I add the CellPreviewHandler (Line 6)

Errors (line 6 & 8)

-the Type new CellPreviewEvent.Handler(){} must implement the inherited abstract method CellPreviewEvent.Handler.onCellPreview(CellPreviewEvent)

-The method onCellPreview(CellPreviewEvent) of type new AsynCallBack(String[][]>(){} must override or implement a supertype method

MyCode:

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");
}

Link to original solution: adding Double click event in CellTable cell - GWT

Upvotes: 0

Views: 562

Answers (1)

Andrei Volgin
Andrei Volgin

Reputation: 41089

This is not a very good code (a better option would be to extend DataGrid class), but if you don't want to change much, simply replace <T> with <String[]>.

Upvotes: 1

Related Questions