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GT Presentation: Show Conditionally?

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Sean P. DeNigris

GT Presentation: Show Conditionally?

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Is there a way to specify that a presentation should only be used if a certain condition is met? The use case I have in mind is adding the Magritte presentation to object, but only showing if the object has a Magritte description. It is a PITA to have to copy/paste the presentation method into every Magritte-described object...

Cheers,
Sean

Tudor Girba-2

Re: GT Presentation: Show Conditionally?

use a when: clause.

For example, look at:

FileReference>> gtInspectorPngIn: composite

<gtInspectorPresentationOrder: 0>

composite morph

title: 'Picture';

display: [ self binaryReadStreamDo: [ :stream | PNGReadWriter formFromStream: stream ] ];

when: [ self mimeTypes notNil and: [ self mimeTypes first matches: ZnMimeType imagePng ] ]

Cheers,

Doru

On Sun, May 31, 2015 at 7:50 PM, Sean P. DeNigris <[hidden email]> wrote:

Is there a way to specify that a presentation should only be used if a
certain condition is met? The use case I have in mind is adding the Magritte
presentation to object, but only showing if the object has a Magritte
description. It is a PITA to have to copy/paste the presentation method into
every Magritte-described object...

-----
Cheers,
Sean
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Sean P. DeNigris

Re: GT Presentation: Show Conditionally?

Administrator

Tudor Girba-2 wrote

use a when: clause.

Perfect :)

Cheers,
Sean