[Glade-users] custom property setter not fired on commit

Domenico Ferrari domfe at tiscali.it
Mon Mar 17 14:06:15 UTC 2014 

Ok. But how can I get the GladeEditorProperty object to connect to?
In my editor I call glade_gtk_store_create_editable and I have no
access to the property editor, I can only get the GladeProperty with
glade_widget_get_property.

Dome


2014-03-17 13:12 GMT+01:00 Tristan Van Berkom <tristan at upstairslabs.com>:
> On Mon, 2014-03-17 at 12:39 +0100, Domenico Ferrari wrote:
>> Hi Tristan and thank you. Works like a charm.
>>
>> Now I want to synchronize two properties in my GtkListStore object:
>> one is the original "columns" property, the other is my own property.
>>
>
> Hi,
>
> Commands should never be issued in a set-property function, this will
> probably cause some madness to occur (probably some ugly recursion).
>
> What you want to do instead is connect to the "pre-commit" and
> "post-commit" signals on a GladePropertyShell object that you
> would declare in a custom editor for your object.
>
> For example, like we do in the about dialog editor code[0]
> and ui definition[1].
>
> Notice what we do in this editor:
>   o glade-gtk-window.c creates a GladeAboutDialogEditor for
>     the "General" tab for any about dialog[2] (yeah that's
>     messy, it should be done in the glade-gtk-about-dialog.c
>     subclass...)
>   o The GladeAboutDialogEditor declares a GladePropertyShell
>     which will automatically create an editor for the "license-type"
>     property, that's in it's own Glade file (as described at [1])
>   o The GladeAboutDialogEditor surrounds the commits that the
>     property editor for the "license-type" property will make,
>     by pushing a group in "pre-commit" and popping it in "post-commit".
>
> In short, if you want to do what you are trying, you need to catch
> the commit from the source - when the property editor itself makes
> the commit - while the GladeWidgetAdaptor->set_property() method is
> only meant to apply a value from Glade's data model onto a runtime
> object in the work space (note that even though ->set_property() is
> called as a consequence of changing a property value, it is *also*
> called when any change is made via Undo/Redo).
>
> Make sense ?
>
> Cheers,
>     -Tristan
>
>
> [0]:https://git.gnome.org/browse/glade/tree/plugins/gtk
> +/glade-about-dialog-editor.c#n129
> [1]:https://git.gnome.org/browse/glade/tree/plugins/gtk
> +/glade-about-dialog-editor.ui#n123
> [2]:https://git.gnome.org/browse/glade/tree/plugins/gtk
> +/glade-gtk-window.c#n156
>
>> E.g.
>> columns prop (type, name values)
>> gint, intcol
>> gchar, charcol
>>
>> my columns prop (name, note values)
>> intcol, "note on intcol"
>> charcol, "i'm a note"
>>
>> Note: on "my columns" prop the user can change only the note value, no
>> change on the number of columns or the names, they are taken from the
>> original "columns" prop.
>>
>> Now, I want to keep my property synchronized to the main property.
>> My coding behave as expected if I use glade_property_set but I have a
>> problem with the undo/redo stack... again :(
>>
>> I tried a change in my code but with no success.
>>
>> Here's a snippet of my set-property function that overrides the
>> original GtkListStore call.
>>
>> if(strcmp(property_name, "columns")==0)
>> {
>>     ...
>>
>>     gwidget=glade_widget_get_from_gobject(object);
>>     property = glade_widget_get_property(gwidget, "my-columns");
>>     glade_property_get(property, &colfmts);
>>
>> ... change colfmt to reflect "columns"
>>
>>     glade_command_push_group("Setting columns on %s",
>> glade_widget_get_name(gwidget));
>>
>>     g_value_init (&newvalue, MY_TYPE_COLUMN_FORMAT_LIST);
>>     g_value_take_boxed (&newvalue, colfmts);
>>     glade_editor_property_commit (eprop, &newvalue);
>>     g_value_unset (&newvalue);
>>
>>     /* Chain Up */
>>     glade_gtk_store_set_property(adaptor, object, property_name, value);
>>     glade_command_pop_group ();
>> }
>>
>> Thank you. Cheers,
>> Dome
>>
>>
>> 2014-03-15 6:10 GMT+01:00 Tristan Van Berkom <tristan.van.berkom at gmail.com>:
>> > If your custom property is of some unknown GType, like a boxed type
>> > you introduced for example, you will need to provide a
>> > GladeStringFromValue function[0] in your widget adaptor definition.
>> >
>> > The string it generates must be unique per possible value that your
>> > GType can have, without this Glade has no way to compare your value
>> > with another value and cannot tell if the value actually changed or
>> > not (and thus needs to be updated in the workspace).
>> >
>> > As with all other GladeWidgetAdaptor methods, the string_from_value()
>> > method should chain up to the adaptor implementing the parent widget
>> > type if that is appropriate, here is an example of how we handle it
>> > for the custom "items" property of GtkComboBoxText[1], GtkListStore[2]
>> > also does this for the "columns" property.
>> >
>> > Cheers,
>> >     -Tristan
>> >
>> > [0]:https://developer.gnome.org/gladeui/unstable/gladeui-glade-widget-adaptor.html#GladeStringFromValueFunc
>> > [1]:https://git.gnome.org/browse/glade/tree/plugins/gtk+/glade-gtk-combo-box-text.c#n82
>> > [2]:https://git.gnome.org/browse/glade/tree/plugins/gtk+/glade-gtk-list-store.c#n243
>> >
>> >
>> > On Fri, Mar 14, 2014 at 11:12 PM, Domenico Ferrari <domfe at tiscali.it> wrote:
>> >> Hi.
>> >> I'm doing a new plugin for my widget...
>> >> It has a property editable with a TreeView, like "columns" on
>> >> GtkListStore object.
>> >> In my callback function on "edited" signal I have the following code
>> >>
>> >>   g_value_init (&value, MY_TYPE_COLUMN_FORMAT_LIST);
>> >>   g_value_take_boxed (&value, colfmt);
>> >>   glade_editor_property_commit (eprop, &value);
>> >>
>> >> but my custom property setter is not fired. If I use
>> >> glade_property_set it is correctly called but I miss the undo/redo
>> >> stack.
>> >> Can I have some help?
>> >>
>> >> Thanks!
>> >> _______________________________________________
>> >> Glade-users maillist  -  Glade-users at lists.ximian.com
>> >> http://lists.ximian.com/mailman/listinfo/glade-users
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>
>

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