Thanks for the reply. Interesting! Let me think. Well let me explain more
and perhaps this should help a bit.
I have a CellList which has custom Cell which shows read only text. And I
have a GWT form which has some textboxes and Listboxes displayed next to my
CellList. So if Cell 1 is clicked, the data for the underlying DTO for cell
1 is shown in the form.
Any changes in values in any of the textboxes and Listboxes, I update my
formChangedFlag.
My goal here is if the user has selected Cell 1 and form is displayed with
the data of Cell 1 DTO and if the user changes any of the form data and
clicks on another Cell let's say Cell 3, I want to show my confirm message
and if they decide not to leave then DO NOT change the selection to Cell 3.
I thought implementation SingleSelectionModel would be easier by overriding
setSelected than FieldUpdater as I haven't used FieldUpdater.
Any ideas?
On Saturday, February 2, 2013 10:30:16 PM UTC-6, Milan Cvejic wrote:
>
> Why are you not using FieldUpdater?
>
> So instead of preventing selection, you actually handle changes in cells?
>
> On Friday, February 1, 2013 11:22:56 PM UTC+1, BM wrote:
>>
>> So I have a custom SingleSelectionModel which I am using to catch the
>> setSelection well before it is selected. Basically to Cancel selection of
>> second cell if the form data of the first cell is not saved.
>>
>> public class PromptingSelectionModel<T> extends SingleSelectionModel<T> {
>>
>> private boolean stopSelection;
>>
>> public PromptingSelectionModel() {
>>
>> super();
>>
>> }
>>
>> public PromptingSelectionModel(ProvidesKey<T> keyProvider) {
>>
>> super(keyProvider);
>>
>> }
>>
>> @Override
>>
>> public void setSelected(T object, boolean selected) {
>>
>> if (formChanged
>>
>> && !Window.confirm("There are unsaved changes, are you
>> sure you want to continue?")) {
>>
>> stopSelection = true;
>>
>> return;
>>
>> } else {
>>
>> stopSelection = false;
>>
>> }
>>
>> if (!(stopSelection)) {
>>
>> super.setSelected(object, selected);
>>
>> }
>>
>> }
>>
>> The problem I see here is When I move from one Cell item to another the
>> setSelected method here is sometimes called twice and sometimes it is
>> called once.
>>
>> Cell 1 selected. Which shows form data. I changed form data. formChanged
>> get set to True.
>>
>> Clicked on Cell 3. setSelected method of PromptingSelectionModel is
>> called. I see parameters to the methods are coming as DTO of Cell 1 and
>> false. I get the confirm dialog box. I clicked Cancel. setSelected method
>> of PromptingSelectionModel is called again. I see parameters to the methods
>> are coming as DTO of Cell 2 and true. I get the confirm dialog box again.
>> Clicking Cancel now will keep the selection of Cell 1. So I got two confirm
>> here okay? Then I click Cell 5. setSelected method of
>> PromptingSelectionModel is called. I see parameters to the methods are
>> coming as DTO of Cell 5 and true.I get the confirm dialog box only once.
>> Clicking Cancel now will keep the selection of Cell 1.
>>
>> Is this a know bug? It seems internally hasCellPresenter class is called
>> or something which sets the second cell as true.
>>
>>
>>
>>
>>
>>
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