Best Design Pattern for widgets

[Sebastian Coronado A.]

Hello I was checking MVP explanation, it works for the whole
application but what if I want to create a single widget that does not
need transitions from one view to another. For example what design
pattern would you use to create a rich text editor.
regards

[Gal Dolber]

mmm...

1. Use Composite!
2. Reduce to the minimum the number of widgets that compose your new widget (Bulk html rendering + top level event capturing). 
3. Learn all you can from native gwt widgets.
4. Make good use of interfaces [HasText, HasHTML, Foccusable.. everything you can find under com.google.gwt.user.client.ui]
5. UiBinder support! Design pojo-like widgets.
6. Use gwt's shared events when possible [SelectionEvent, ValueChangeEvent, .... (under com.google.gwt.event.logical.shared)]
7. ~~~do not create your own event system? :-J
8. ~~~do not create your own panels and layout system? :-J

This session is really recommendable: http://www.youtube.com/watch?v=7x4hun_Kqks

Best

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Guit: Elegant, beautiful, modular and *production ready* gwt applications.

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[A. Stevko]

I totally agree - extending Composite is the way to go.

Composite Widgets are nice for encapsulating & localizing all the CRUD associated with a single object like your text editor.

RichTextToolbar,java is a stock example of a widget that attaches itself to your RichTextArea

See RichTextToolbar in action at http://gwt.google.com/samples/Showcase/Showcase.html#!CwRichText

Source at http://code.google.com/p/google-web-toolkit/source/browse/trunk/samples/showcase/src/com/google/gwt/sample/showcase/client/content/text/RichTextToolbar.java?r=4142

-- A. Stevko

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"If everything seems under control, you're just not going fast enough." M. Andretti

[Thomas Broyer]

In addition to what others already said, you can use MVP inside your widget, so that you can easily unit-test your logic. Have a look at com.google.gwt.user.cellview.client.AbstractHasData (the base class for CellList and the like) which uses this pattern.

[Sebastian Coronado A.]

Composite is nice but my widget has like 5 widgets, it looks messy.

@Thomas
thanks I will take a look


On 8 ene, 06:09, Thomas Broyer <t.bro...@gmail.com> wrote:
> In addition to what others already said, you can use MVP *inside* your