Hi Melody,
When you say this was working on GWT 1.4.x, was that on all supported
browsers? Also, is the problem you're experiencing now with event
previews that don't always come up also happening uniformly across all
supported browsers?
The reason I ask is because I want to see if the spotty event previews
are due to differing browser DOM implementations or if there is indeed
something going on with the breaking lazy event sinking change
introduced in GWT 1.5.
Cheers,
-Sumit Chandel
On Wed, Sep 17, 2008 at 2:28 PM, melody <[EMAIL PROTECTED]> wrote:
>
> Use Case
> 1. Disable browser context menu by default
> 2. Enable browser context menu on edit controls like EDIT boxes,
> listboxes etc when such controls receive focus. This is required so
> that you can do the normal highlighting, cut, copy and paste from such
> controls
>
> 3. When edit controls lose focus, disable the browser content menu
> again
>
> 4. Example
>
>
> //disable browser context menu on main page
> <code>
> private static native void disableBrowserContextMenuJSNI() /*-{
> $doc.oncontextmenu = function() { return false; };
> }-*/;
> </code>
>
> //enable browser context menu
> private static native void restoreContextMenuJSNI() /*-{
> $doc.oncontextmenu = function() { return true; };
> }-*/;
>
>
> Create edit box with preview that allows switching between disbaled
> and enabled context menu
> <code>
> public class PreviewTextBox extends TextBox implements FocusListener {
>
> public PreviewTextBox() {
> this.addFocusListener(this);
> }
>
> public void onDetach() {
> super.onDetach();
> disableBrowserContextMenuJSNI();
> DOM.removeEventPreview(m_preview); //tos - 1
> }
>
> public void onFocus(Widget w) {
> DOM.removeEventPreview(m_preview); //tos - 1
> DOM.addEventPreview(m_preview); //tos
> restoreContextMenuJSNI();
> }
>
> public void onLostFocus(Widget w) {
> disableBrowserContextMenuJSNI();
> DOM.removeEventPreview(m_preview); //tos - 1
> }
>
> private EventPreview m_preview = new EventPreview() {
> public boolean onEventPreview(Event event) {
> int type = DOM.eventGetType(event);
> switch (type) {
> case Event.ONMOUSEDOWN:
> Element target1 = DOM.eventGetTarget(event);
> if (!
> PreviewTextBox.this.getElement().isOrHasChild(target1)) {
> disableBrowserContextMenuJSNI(); //by
> defauly no browser context menu must show
> DeferredCommand.addCommand(new Command() {
> public void execute() {
>
> DOM.removeEventPreview(m_preview); //tos - 1
> }
> });
> }
> break;
> default:
> break;
> }
> // But DO allow the event to fire.
> return true;
> }
> };
> }
> </code>
>
>
> The above code was working perfectly in GWT 1.4.x
>
> With the advent of GWT1.5, this nolonger works and I get the browser
> context menu anyway.
>
> Is there anything else I need to do to make the oncontextmenu event
> work in GWT 1.5.
>
>
>
>
> Also I noticed that now we have Event.ONCONTEXTMENU as an event bit.
>
> I tried using EventPreview to stop the context menu from showing but
> most of the times this event is NOT PREVIEWED! See example below
>
> <code>
> public boolean onEventPreview(Event event) {
> int type = DOM.eventGetType(event);
> switch (type) {
> case Event.ONCONTEXTMENU:
> Element target = DOM.eventGetTarget(event);
> if (!
> m_search_textbox.getElement().isOrHasChild(target)) {
> DOM.eventPreventDefault(event);
> DOM.eventCancelBubble(event, true);
> return false;//dont allow to bubble break;
> }
> break;
> }
> return true;
> }
> </code>
>
> Any reason why it previews sometimes and not all the time.
>
> Does it have anything to do with this line
>
> "GWT Widgets now sink their events lazily: widgets no longer routinely
> sink their events eagerly. Instead, the event is sunk the first time a
> listener is added to the widget. So subclasses which relied on eagerly
> sunk events will now have to manually sink the events they depend
> upon."
>
> from the breaking changes page:-
>
> http://code.google.com/docreader/#p=google-web-toolkit-doc-1-5&s=google-web-toolkit-doc-1-5&t=ReleaseNotes_1_5_BreakingChanges
>
>
> If so what do I need to do.
>
> Thanks,
>
> Melody
> >
>
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