[Glade-users] Viewing custom widget sub-widgets in Glade tree-view

[Tristan Van Berkom]

On Tue, Oct 5, 2010 at 12:18 AM, Klaim <mjklaim at gmail.com> wrote:
> Hi,
> as disscussed there : http://www.gtkforums.com/viewtopic.php?p=18030#18030
> I've managed to make my sub-widgets appear where I wanted, in the treeview.
> However, the treeview content will not be updated when I'll add new
> seb-widget to my custom widget, or remove some from it.
> I've been analzing and trying to reproduce some techniques that are used in
> gtk widgets plugin code that we can find here :
> http://git.gnome.org/browse/glade3/tree/plugins/gtk+/glade-gtk.c
> I've been trying for several days but couldn't update the tree view.
> I've implemented a plugin for glade, it provide (wired in the xml file) :
>     post-create-function
>     set-property-function
>     get-internal-child-function
>     get-children-function
> I see that the get-internal-child-function is not even called by glade (then
> I don't undersand when it should be called) but at the moment I implemented
> get-children-function I started to see the subwidgets in the glade
> tree-view.
> I've been following advices given there
> : http://www.mail-archive.com/gtk-app-devel-list@gnome.org/msg12349.html
>
> I think I'm missing something simple as the gtk glade plugin code don't seem
> too complicated but I can't find how it makes the sub-children updated in
> the treeview.
> When I load a gui built with glade and saved with modified number of
> sub-widgets in my custom widget, I get the right count of sub-widgets in the
> tree-view. Only modifying it will not update the tree-view.
> My custom widget have two properties with widgets counts that will add or
> remove widgets from the custom widget (in the widget code).
> So in the plugin I've only added in post-create-function and
> set-property-functino some way to call
> glade_widget_adaptor_create_internal() on new digets added to the custom
> widget.
> It's the same function that is called in the two functions but it seem to
> work only with post-create-function.
> Any suggestion?
> I'm not sure if that question is clear enough, but tell me if it's not.

I'm a little confused about what exactly is not working for you.

If you have a custom widget that is a GtkContainer, so long as
it works like an ordinary container you should not need to implement
anything custom along the lines of get-children or any of that.
(take the GtkBox implementation for reference in this case; it
uses a virtual 'size' property to decide how many placeholders
to expose in the Glade workspace).

Note that get-internal-child is for indirect children of composite
widgets. Thats what lets a GtkDialog configure properties and
add children to its internal 'vbox' or 'action-area' (I think thats
out of context for you, I think you just have a normal container).

What you need to do when implementing a normal container
is usually add placeholders to it if and when appropriate; then
you need to implement add-child-function/remove-child-function
and replace-child-function (replace-child will be called if your
plugin uses GladePlaceholder ... the Glade core will replace
the placeholder with a widget from the palette; giving it the
initial packing properties of the placeholder).

So, generally you should just start with add-child and remove-child
functions... you should not need to call glade_widget_adaptor_create_internal()
unless you are exposing an internal child of a complex composite

You dont need to implement get-children-function either unless you need
to add something to the generic child list already returned by your
container's implementation of GtkContainerClass->forall().

Does that help ?

Please let me know in more detail what is the nature of your container
so I can better help you, is it a basic container widget that only lays out
it's children in a custom way ?

Cheers,
         -Tristan


> Thanks for reading
> Joel Lamotte.
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