Thanks Thomas,
Test and works as suggested. The class owning my CellList extends
Composite and I now have overridden the onLoad method like this:
@Override
protected void onLoad() {
myCellListView.unsinkEvents(Event.MOUSEEVENTS);
}
... and no longer are the mouse over/out/move events flooding into my
console. Interesting I still get a CPU spike when I wiggle my mouse,
but I am in hosted mode, could this have something to do with it?
Could it be that when I compile to javascript these mouse events are
genuinely ignored and have no processing overhead?
It's not a biggie, it's just that I am rendering a non-trivial view of
data in my CellList and performance is essential.
On Jun 23, 1:57 pm, Thomas Broyer <t.bro...@gmail.com> wrote:
> On 23 juin, 10:51, Paul Schwarz <paulsschw...@gmail.com> wrote:
>
>
>
>
>
> > Summary: in a CellList I want to sink the ONCLICK and ONCONTEXTMENU
> > events to be handled by my Cell's onBrowserEvent method, but I don't
> > want any mouse over/out/move events, but cannot seem to unsink them.
>
> > In 2.1 M1 we have CellList. If you look at the constructor of CellList
> > you'll see on line 139
> > sinkEvents(Event.ONCLICK | Event.ONCHANGE | Event.MOUSEEVENTS);
>
> > So the CellList is presuming that these are the events that we're
> > interested in. Now I have created my own concrete implementation of an
> > AbstractCell.
> > Other implementations are TextCell, ButtonCell, CheckboxCell, etc. So
> > I have followed those as examples, but have created my own Cell
> > implementation.
>
> > One of the methods that can be implemented is:
> > public abstract Object onBrowserEvent(Element parent, C value, Object
> > viewData, NativeEvent event, ValueUpdater<C> valueUpdater);
>
> > ... and in that method I am interested in a Click event and a Context
> > menu event. I notice that my CPU usage peaks at 50ish% when I move my
> > mouse around. Sure enough GWT is picking up all the mouse over, mouse
> > out, mouse move events as well. AND I'm not getting my Context menu
> > event (because I haven't explicitly sunk it yet).
>
> > So in my UI class that keeps an instance of this CellList, in the
> > constructor I have:
> > myCellList.sinkEvents(Event.ONCONTEXTMENU);
> > myCellList.unsinkEvents(Event.MOUSEEVENTS);
>
> > ... so now I am getting my Context menu event, but I am still getting
> > a flood of mouse events as I wiggle my mouse over the Cells in the
> > CellList. I have tried explicitly unsinking Event.ONMOUSEOVER et al.
> > but that has no effect either.
>
> > Either this is a bug, or more likely I am unsinking the event on the
> > wrong element or unsinking in the wrong order, or I am missing
> > something altogether.
>
> > Any ideas?
>
> Widget#sinkEvents defers the call to DOM.sinkEvents until the widget
> is attached, but unsinkEvents doesn't, and don't update the
> "eventsToSink" private variable (this could be seen as a bug in
> Widget, which should override unsinkEvents too).
> The workaround seems to be (not tested) to call unsinkEvents from an
> onLoad override.
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