10 Feb
2015
10 Feb
'15
7:55 p.m.
2015-02-10 17:38 GMT+01:00 Andrei Chis <chisvasileandrei(a)gmail.com>om>:
Hi Nicolai,
All glamour browser open on a model object. The display block is used to
extract from that model object the actual object that would be displayed.
In the case of a tree presentation the display block should return the
initial roots of three. So you can open the browser on any object, and then
the display block would get that object as a parameter and return a list of
objects that would be used as the roots of the tree.
For example, you could write 'browser openOn: FileSystem disk' and then
have a display block that extracts the working directory from the file
system (display: [ :filesystem | filesystem workingDirectory ];)
The whole example would look like:
browser := GLMTabulator new.
browser
column: #tree;
column: #text.
browser transmit
to: #tree;
andShow: [ :a |
a tree
title: 'FS';
display: [ :filesystem | filesystem workingDirectory ];
format: [ :item | item basename ];
children: [ :item |
item isDirectory
ifFalse: [ #() ]
ifTrue: [ item children ] ] ].
browser openOn: FileSystem disk
Cheers,
Andrei
Thank you for the explanation Andrei,
I thought the display block is used to convert the data to a displayable
representation.
But if it is used to extract the data, then the described behavior makes
sense of course.
nicolai
On Tue, Feb 10, 2015 at 5:02 PM, Nicolai Hess <nicolaihess(a)web.de> wrote:
Why does a displayblock affect the arguments used
for accessing the
children of the nodes?
The following code creates a TreePresentation from the current working
Directory:
browser := GLMTabulator new.
browser
column: #tree;
column: #text.
browser transmit
to: #tree;
andShow: [ :a |
a tree
title: 'FS';
"display: [ :item | item basename ];"
children: [ :item |
item isDirectory
ifFalse: [ #() ]
ifTrue: [ item children ] ] ].
browser openOn: FileSystem disk workingDirectory.
As I don't want to see the FileReference printString, but the
name of the File, the first thing I tried is a displayblock like
the commented line above.
But after this change the children block does not work anymore.
The item it calls #isDirectory on, is not the FileSystem entry but the
name returned by the display block.
#format: instead of #display: works:
browser := GLMTabulator new.
browser
column: #tree;
column: #text.
browser transmit
to: #tree;
andShow: [ :a |
a tree
title: 'FS';
format: [ :item | item basename ];
children: [ :item |
item isDirectory
ifFalse: [ #() ]
ifTrue: [ item children ] ] ].
browser openOn: FileSystem disk workingDirectory
May examples from GLMBasicExamples are using #display: , thats why
I tried this first. What is the intention to use
the display block for accessing the children?
nicolai
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