Hi, Sorry for replying this way (I had some troubles with my subscription - I thought I clicked on the subscribe button, but I didn't :p).
So to answer to you, Hans, what I wanted was to add properties such as text, integer, floats... to a line (and display these properties into the dialog box objects>properties in order to modify them). I am not trying to display them on the line representation (I have seen that labeling lines is an open question too). Currently I export my diagram with a filter that automatically generates text and associates it to a line... I hope it clarifies things. Regards, Julien At 05.07.2012 11:29, Julien SIEBERT wrote: > [...] >> I was wondering if there is any way to add external properties to >> custom lines the same way it is possible to add external properties to >> custom shapes (via<ext_attributes> in the .line file) ? >> It is not. And before you start to extend custom_lines please be aware of >> a fundamental design flaw of the ext_attributes. > > > I manifests itself by this compile time warning: > custom_object.c(385) : warning C4133: 'function' : incompatible types - > from 'PropDescription *' to 'Property *' > > >> I tried - in a naive way - to directly add<ext_attributes> in my line >> files, but after looking at custom and custom lines C code I am just >> asking what are the difficulties to add such a feature ? > > Custom Shapes and Custom Lines have - from my understanding - slightly > different use cases. > "The custom shape module allows you to create new shapes for Dia > without writing any C code. Instead, you just have to write a simple > XML file describing the shape. This opens up the job of creating new > shapes for dia to non programmers as well." [1] > "[The custom lines module] allows users to define "line shapes" with > preconfigured settings for start/end arrow, line style, thickness, color, > etc. using simple XML." [2] > The main difference from my point of view is that the custom lines module > (only) is used to preconfigure some objects already there; while the custom > shape module allows to create new objects from scratch. > Some of the open questions for the custom line module are kind of open for > years [3] - and I'd say this is not due implementation difficulties but due > to difficulties in requirements elicitation. For your new feature I still > need to understand what you want to achieve with it. > The difficulties of implementation almost entirely depend on the > requirements ;-) If you want to avoid writing code, which is difficult to > be included with Dia, let's talk about the design first. I've already > rewritten the custom_lines plug-in once to make it portable and adhere to > Dia design principles. [4], [5] > HTH, > Hans > [1] http://git.gnome.org/browse/dia/tree/doc/custom-shapes > [2] https://mail.gnome.org/archives/dia-list/2007-October/msg00053.html > [3] http://mail.gnome.org/archives/dia-list/2008-March/msg00008.html > [4] http://git.gnome.org/browse/dia/log/objects/custom_lines > [5] > http://git.gnome.org/browse/dia/commit/objects/custom_lines?id=e69eb45ecae71272426d51af89065e80c7ff6f52 > -------- Hans "at" Breuer "dot" Org ----------- > Tell me what you need, and I'll tell you how to > get along without it. -- Dilbert -- Julien SIEBERT
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