which shout the text if the model do not know #shoutAboutToStyle:
No. The interaction is different:
1. TextMorph changes its contents. 2. TextMorph notifies its styler withe the morph and its model that there might be the need to style. 3. The styles does whatever it wants to do: Â - The null styler might ignore the request. Â - The ShoutStyler calls #shoutAboutToStyle: on the model to ask if and how to style (earlier versions also called #okToStyle before they called #shoutAboutToStyle:). Â - The ShoutStyler might also decide to auto format the text. I believe earlier versions of Shout could do that.
Ok I have no idea how it was before and we never touched Shout. So I will wait for alain because I'm more and more confused.
In other words, this is a double-dispatch where the type of the styler is revealed on the model. In case of Shout #shoutAboutToStyle: tells the model that Shout is ready to take further commands on how to style the input. This gives true extensibility and is also very efficient. Lukas -- Lukas Renggli www.lukas-renggli.ch