You can fire all listeners of any widget programmatically, but it's
not entirely supported.
However, I doubt it'll change anytime soon.
Here it is:
public static native void fireChangeListener(TextBoxBase box) /*-{
var cl =
[EMAIL PROTECTED]::changeListeners;
[EMAIL PROTECTED]::fireChange(Lcom/
google/gwt/user/client/ui/Widget;)(box);
}-*/;
Might look like magic to you. It sort of is (google for 'gwt jsni' if
you want to know about it), and as I said, in a future version of GWT
it might not actually work. But, odds are low, and, hey, a new big
version was just released, and this trick didn't stop working. You can
adapt it to fire listeners on any other GWT widget; they all work with
the XListenerCollection.fireX(Widget) format.
On Aug 31, 8:34 am, elliot <[EMAIL PROTECTED]> wrote:
> i disagree: onChange is a user listener method, therefore it means on
> user change.
> programmatic alteration does not count.
>
> make a new listener and extend textbox to make it listenable.
>
> /** Calls onContentChange whenever the text changes */
> public class ChangeTextBox extends TextBox {
>
> private static final int CHANGE_EVENTS =
> Event.KEYEVENTS | Event.ONCHANGE | Event.ONCLICK |
> Event.ONDBLCLICK;
>
> private ContentChangeListenerCollection contentChangeListeners;
>
> private String content = "";
>
> public void checkContent(){
> String text = getText();
> if(contentChangeListeners != null && !content.equals(text))
> contentChangeListeners.fireContentChange(this);
> content = text;
> }
> public void onBrowserEvent(Event evt){
> if((evt.getTypeInt() & CHANGE_EVENTS) != 0)
> checkContent();
> super.onBrowserEvent(evt);
> }
> public void setText(String text){
> checkContent();
> super.setText(text);
> }
>
> public void addContentChangeListener(ContentChangeListener listener){
> if (contentChangeListeners == null)
> contentChangeListeners = new
> ContentChangeListenerCollection();
> contentChangeListeners.add(listener);
> }
>
> public void removeContentChangeListener(ContentChangeListener
> listener){
> if (contentChangeListeners != null)
> contentChangeListeners.remove(listener);
> }
>
> }
>
> On Aug 30, 10:54 pm, Marcelo Emanoel <[EMAIL PROTECTED]> wrote:
>
> > I agree... a change is still a change doesn't matter from where it
> > came :) The currently implementation uses the browser event to fire
> > the change... but it can be easily done overriding the setText()
> > method... but then I got a new problem... every time that a new
> > component based on the original one is built I have a new problem...
> > and have to extend the new class to use the correct behavior... and
> > even more... I have to explicitly tell the user to use my new
> > component... like instead of creating a TextBox with "new TextBox()"
> > you'll have to create with "new XXTextBox()" on any component....
>
> > On Aug 30, 10:51 am, al0 <[EMAIL PROTECTED]> wrote:
>
> > > It was made difficult of ... false purpose. Change is change -
> > > regardless of its origins. Otherwise you mix unrelated concepts-.
>
> > > On Aug 29, 3:44 pm, walden <[EMAIL PROTECTED]> wrote:
>
> > > > It's been made difficult...on purpose. Change events are user
> > > > gestures. If you want to notify listeners on your TextBoxes of an
> > > > event you define, then extend TextBox and implement the Observer
> > > > Pattern for your custom event. Don't pollute the meaning of
> > > > "onChange".
>
> > > > Walden
>
> > > > On Aug 29, 9:14 am, Marcelo Emanoel <[EMAIL PROTECTED]> wrote:
>
> > > > > Is it possible?
>
> > > > > On 29 ago, 09:43, Marcelo Emanoel <[EMAIL PROTECTED]> wrote:
>
> > > > > > What I was looking for was something to fire the listeners without
> > > > > > knowing them... just like happens when I press a key on the TextBox
> > > > > > that is already on the screen...
>
> > > > > > On 29 ago, 09:37, Marcelo Emanoel <[EMAIL PROTECTED]> wrote:
>
> > > > > > > I already know of the changeListeners and so on... but that's
> > > > > > > wasn't
> > > > > > > what I'm looking for.... :(
>
> > > > > > > But I've manage another way to do what I need :)
>
> > > > > > > Thanks Anyway
>
> > > > > > > On 29 ago, 08:53, "Ian Bambury" <[EMAIL PROTECTED]> wrote:
>
> > > > > > > > ChangeListener listener = new ChangeListener()
> > > > > > > > {
> > > > > > > > public void onChange(Widget sender)
> > > > > > > > {
> > > > > > > > }};
>
> > > > > > > > TextBox t = new TextBox();
> > > > > > > > t.addChangeListener(listener);
> > > > > > > > t.setText("blah blah blah");
> > > > > > > > listener.onChange(t);
>
> > > > > > > > 2008/8/29 Marcelo Emanoel <[EMAIL PROTECTED]>
>
> > > > > > > > > Hi guys I was wondering if anyone knows how to fire up an
> > > > > > > > > event on a
> > > > > > > > > widget like TextBox or ListBox for example...
>
> > > > > > > > > If I do
>
> > > > > > > > > <code>
> > > > > > > > > TextBox t = new TextBox();
> > > > > > > > > t.addChangeListener(new ChangeListener(){
> > > > > > > > > //implement a listener for changing...
> > > > > > > > > });
>
> > > > > > > > > t.setText("blah blah blah");
> > > > > > > > > </code>
>
> > > > > > > > > the listener won't be called :'(
> > > > > > > > > Is there a way to fire up the listener throw code?
>
> > > > > > > > > Thanks in Advance :)
>
> > > > > > > > --
> > > > > > > > Ian
>
> > > > > > > >http://examples.roughian.com-Hidequotedtext-
>
> > > > > - Show quoted text -
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