对于GWT Java FlexTable，如何在值更改时获取选定的行号

Question

I want to store the GWT FlexTable row number that contains a date when that date is changed. The code is:

//Add change handler for the task completion date.
dateCompletion.addValueChangeHandler(new ValueChangeHandler<java.util.Date>() {
    public void onValueChange(ValueChangeEvent<java.util.Date> event) {

        //TODO currentRow = flexAwardDescription.getRowIndex();
        //Display all YM who have not completed this task.
        AsyncCallback<List<YouthMember>> callback = new YMWithoutAwardHandler<List<YouthMember>>(CubBulkAward3View.this);
        rpc.getYMWithoutAwardList(ymAwardDetails.getad_Id(), callback);
    }
});

I have found an answer for click event; however, not for change event.

Answer 1

Please check my answer here: Gwt getCellForEvent flexTable

There's no obvious way to do it, what you can do is

1. Get event source
2. Cast it to widget
3. Get it's Element via .getElement() then use getParent() to get Cell, and getParent() one more time to get row element.

You can get it's index then, comparing it to rows from rowFormatter in a loop.

Answer 2

The work around I came up with is to capture row number on the click event (as you must first click before you can change) and then use this row number if a change event occurs.

//Get the row number of the row selected to display the names below it.
                flexAwardDescription.addClickHandler(new ClickHandler() { 
                    public void onClick(ClickEvent event) {  
                         currentRow = flexAwardDescription.getCellForEvent(event).getRowIndex();
                    } 
                }); 

                //Add change handler for the task completion date.
                dateCompletion.addValueChangeHandler(new ValueChangeHandler<java.util.Date>() {
                    public void onValueChange(ValueChangeEvent<java.util.Date> event) {
                        //Check if this is the completion row
                        if (ymAwardDetails.getad_Description().matches("(.*)Completed:(.*)")) {
                            groupCompleted = "C";
                        }else{
                            groupCompleted = "S";
                        }
                        awardDescriptionID = ymAwardDetails.getad_Id();
                        //Display all YM who have not completed this task.
                        AsyncCallback<List<YouthMember>> callback = new YMWithoutAwardHandler<List<YouthMember>>(CubBulkAward3View.this);
                        rpc.getYMWithoutAwardList(ymAwardDetails.getad_Id(), accountId, callback);
                    }
                });