Hi Anurag,
Thanks for clearing up your use case. I think Reinier guessed it right the
first time.
What you'll need to do to implement that kind of functionality is as he
suggested, using a violator pattern to access the list of keyboard listeners
and then firing onKeyPress for each of them. You can inspire yourself from
the example below, used to access the private StackPanel.setStackVisible()
method and visibleStack field through JSNI:
private native void violate(StackPanel stackPanel) /*-{
stackpan...@com.google.gwt.user.client.ui.stackpanel
::setStackVisible(IZ)(stackpan...@com.google.gwt.user.client.ui.stackpanel::visibleStack,
false);
stackpan...@com.google.gwt.user.client.ui.stackpanel::visibleStack = -1;
}-*/;
You would essentially do something similar, except to access the keyboard
listener collection instead. It seems like it might be generally useful to
create RichTextArea buttons that could issue key combinations for these kind
of rich text operations. If this sounds reasonable to you, feel free to add
it to the Issue Tracker so that others can track and star it based on
interest.
Issue Tracker:
http://code.google.com/p/google-web-toolkit/issues/list
Hope that helps,
-Sumit Chandel
On Wed, Jan 7, 2009 at 10:58 PM, Anurag Tripathi <anurag...@gmail.com>wrote:
>
> Thanks Sumit for getting back on this ! My scenario is something like
> this -
> On pressing Ctrl+z/Ctrl+y, browser performs Undo/Redo in RichTextArea,
> I want to support this functionality in Buttons, So my intention was
> rather than capturing onBrowserEvents(EventPreviews) just generate ctrl
> +z/ctrl+y programmatically on clicking on buttons and let them browser
> to handle. This will remove javascript quirks too.
> And I didn't find any undo/redo implemenations in RichTextArea.
>
> _Anurag
>
> On Jan 7, 1:11 pm, Reinier Zwitserloot <reini...@gmail.com> wrote:
> > I assume you meant faking the pressing of a key on the keyboard.
> >
> > You can't do that directly, no, but you can sort-of call the
> > keylisteners on any particular object.
> >
> > For example, let's say you have a TextBox instance called 'textBox',
> > and you want to simulate pressing the 'X' button.
> >
> > You'll need to do two things:
> >
> > 1) Simulate the effect of the X button on the textBox itself, which
> > means updating the text inside by inserting an X at the current cursor
> > position.
> >
> > 2) Call all keyboardlisteners on textBox.
> >
> > #2 can be done with some technically nonsupported hackery - each
> > implementation of SourcesKeyboardEvents in GWT at least has an
> > internal private object of type 'KeyboardListeners', called
> > 'keyboardListeners'. While its private, you can still get at it via
> > JSNI (look that up) which doesn't know about 'private' and thus allows
> > it. Once you have the keyboardListeners, which is really just an
> > ArrayList, you can loop through them and fire the appropriate call
> > (e.g. onKeyPress) on all of them.
> >
> > The reason GWT doesn't support this directly is because javascript
> > doesn't support it either. GWT isn't magic; it cannot make things that
> > are impossible on the target platform possible.
> >
> > On Jan 2, 2:26 pm, Anurag Tripathi <anurag...@gmail.com> wrote:
> >
> > > Can we programmatically generate physical keys in GWT ?
> >
> > > Scenario : I want to generate some key on clicking in Button !
> >
> > > If anyone has any idea on this, please let me know -
> >
> > > _Anurag
> >
>
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