The scroller itself provides the transform morph that deals with offsetting
within the scrollpane.
Canvases are used in the drawing cycle of morphs so a morph of some kind
(that implements drawOn: and draws the graphics) should be added to the
scroller of the scrollpane. The transform morph sets the clipping rectangle
for drawing its submorphs.
|window pane m|
window := SystemWindow labelled: 'Mondrian Canvas'.
window model: self.
window extent: 640 @ 480.
pane := ScrollPane new.
m := PolygonMorph new
position: 2...@200;
extent: 4...@300.
pane scroller addMorph: m.
window
addMorph: pane
frame: (0 @ 0 corner: 1 @ 1).
window openInWorld.
Regards, Gary
----- Original Message -----
From: "Igor Stasenko" <[email protected]>
To: <[email protected]>
Sent: Sunday, February 22, 2009 12:11 PM
Subject: Re: [Pharo-project] Question about Morphic
> 2009/2/22 Alexandre Bergel <[email protected]>:
>>> Canvas has the clipping capabilities.
>>> So, you can send a command to render a rectangle (-1000 @ -1000)
>>> corner: (10000 @10000)
>>> but depends on canvas clipping area, it will render only part of it.
>>>
>>> Also, for displaying morphs withing area with scrolling - use a
>>> TransformMorph to apply clipping & sroll in view.
>>> There are another morphs , ready for use , like ScrollPane
>>
>> I exactly use a ScrollBar. Here is a code excerpt:
>> -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
>> | window pane |
>> window := SystemWindow labelled: 'Mondrian Canvas'.
>> window model: self.
>> window extent: 640 @ 480.
>> pane := ScrollPane new.
>>
>> canvas := MOCanvas on: self root.
>> pane scroller addMorph: canvas.
>> window
>> addMorph: pane
>> frame: (0 @ 0 corner: 1 @ 1).
>> window openInWorld.
>> -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
>>
>> MOCanvas is a subclass of Morph that is resized on some point.
>>
>> Apparently, this incantation does not activate this clipping.
>>
> Well, i'm not sure how to use ScrollPane properly..
> look for examples of it in other morphs.
>
>> Alexandre
>>
>>>
>>>
>>>> Cheers,
>>>> Alexandre
>>>> --
>>>> _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:
>>>> Alexandre Bergel http://www.bergel.eu
>>>> ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>> Pharo-project mailing list
>>>> [email protected]
>>>> http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
>>>>
>>>
>>>
>>>
>>> --
>>> Best regards,
>>> Igor Stasenko AKA sig.
>>>
>>> _______________________________________________
>>> Pharo-project mailing list
>>> [email protected]
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>>>
>>
>> --
>> _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:
>> Alexandre Bergel http://www.bergel.eu
>> ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.
>>
>>
>>
>>
>>
>>
>> _______________________________________________
>> Pharo-project mailing list
>> [email protected]
>> http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
>>
>
>
>
> --
> Best regards,
> Igor Stasenko AKA sig.
>
> _______________________________________________
> Pharo-project mailing list
> [email protected]
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