Re: gtk_widget_draw()

[Paul Davis <paul linuxaudiosystems com>]

On Wed, Aug 18, 2010 at 11:49 AM, Federico Mena Quintero
<federico ximian com> wrote:
> On Wed, 2010-08-18 at 07:56 -0400, Paul Davis wrote:
>
>> its quite amusing to me how what is being described is slowly
>> converging on something extremely close to a canvas model in many of
>> its most fundamental aspects. am i the only one seeing this? does it
>> matter?
>
> In my mind a canvas does two things:
>
> 1. Retained drawing.  You draw something and you get a handle back to it
> so that you can modify it (move it, recolor it, etc.).  GDK doesn't do
> retained drawing; it does direct drawing where you draw something but
> you have no way to modify it afterwards.
>
> 2. Hit detection.  You get events relative to the objects that you drew.
> This is a lot more sophisticated than "something happened inside this
> rectangular window" :)

in my mind,  a canvas does two things:

1) composites together the result of a variety of different objects
drawing themselves, most likely with z-axis ordering. it does

2) event distribution