Re: Template Widgets inside another GtkBuilder file

[Victor Aurélio Santos]

So the really question becomes, how to get `g_type_ensure` generated
in output code when subclassing Widgets in Vala ?

2015-10-05 17:54 GMT-03:00 Victor Aurélio Santos :
> Emmanuele,
>
>> In order to do that, you should use `g_type_ensure()` inside the
> instance initialization function of the parent's widget class
>
> Since using Vala, from what I can see in case of using [GtkTemplate]
> the g_type_ensure is generated, but when just subclassing a GtkWidget
> it doesn't exists in the generated .c, am I right ?
>
> And what I can do to g_type_ensure be present in generated .c in the
> second case ?
>
> Thanks.
>
> 2015-10-04 10:40 GMT-03:00 Emmanuele Bassi :
>> Hi;
>>
>> On 3 October 2015 at 02:14, Victor Aurélio Santos
>>  wrote:
>>> How can I do that ?
>>> Just build all together results in this warning:
>>>
 (ajami:3475): Gtk-CRITICAL **: Error building template class 
 'AjamiMainWindow' for an instance of type 'AjamiMainWindow': Invalid 
 object type 'HVMeter' on line 2
>>>
>>> I've asked on SO[1] and got only one answer.
>>>
>>> I stick at "_get_type" workaround/hack but I didn't like it and I
>>> can't do the same thing in Vala (I've not found how to do the same
>>> thing).
>>>
>>> More details can be found on SO question.
>>>
>>> So, what I really want to know is what is the best option to
>>> accomplish this in Vala and in C too.
>>>
>>> [1]: 
>>> http://stackoverflow.com/questions/24235937/custom-gtk-widget-with-template-ui
>>
>> If you have an internal, private widget that you use as a child in a
>> template, you'll need to ensure that the type system knows about the
>> child widget's type before initializing the template that references
>> it.
>>
>> In order to do that, you should use `g_type_ensure()` inside the
>> instance initialization function of the parent's widget class, right
>> before calling `gtk_widget_init_template()`; for instance:
>>
>>   g_type_ensure (hv_meter_get_type ());
>>
>> This is also what GTK+ itself does:
>> https://git.gnome.org/browse/gtk+/tree/gtk/gtkfilechooserwidget.c#n8598
>>
>> Ciao,
>>  Emmanuele.
>>
>> --
>> https://www.bassi.io
>> [@] ebassi [@gmail.com]
>
>
>
> --
> Victor Aurélio Santos



-- 
Victor Aurélio Santos
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Filechooserbuttons and gtk_widget_set_sensitive

[Roger Matthews]

To someone willing to help,
 
 1) Following the example Listing 4.10 of the GTK+ Development book 
filechooserbuttons.c I have created a filechooser button and label, which are 
attached to a grid rather than a box. When clicked a "dialogue" appears, I can 
then navigate directories to the filtered files, highlight the selected files, 
but when double-clicked or press 'open', nothing happens. That is, the 
path/filename is displayed in the label and the selected filename is displayed 
in the button but the file is not opened. How do I open the file?
 
2) I would like to activate/de-activate spinbuttons depending on whether 
certain other selections have been made (with other integer spinbuttons). I 
have tried using gtk_widget_set_sensitive ( GtkWidget *widget, gboolean 
sensitive) but get compilation warning: unknown type name 'gtk_widget_set'. I'm 
using GTK3. Any clues? 
 
3) I've built a GUI coded in C without using a builder.ui file and would like 
to make it into a stand-alone application, preferably all 'hand' coded, how do 
I do this? I'm having difficulty following the example in the documentation 
because it uses a buider.ui file, I am unsure of the form of the main() format, 
and I can't locate 
https://git.gnome.org/browse/gtk+/tree/examples/application2/exampleappwin.c 
 
Thanks,
Roger Matthews
  
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gtk_text_buffer_delete ?

[Pierre Wieser]

Hello, 

On the application I'm currently working on [1], I want limit the size of the
text entered in a GtkTextBuffer to those saved in the DBMS, so 4096 chars.

I so connected to the 'changed' signal of the GtkTextBuffer, and the handler
is :

static void
on_notes_changed( GtkTextBuffer *buffer, void *empty )
{
static const gchar *thisfn = "my_utils_on_notes_changed";
static const gint MAX_LENGTH = 4096;
static gboolean in = FALSE;
gint count;
GtkTextIter start, end;

/* prevent an infinite recursion */
if( !in ){
count = gtk_text_buffer_get_char_count( buffer );
if( count >= MAX_LENGTH ){
/*
 * this code works, but emit the following Gtk-Warning:
 *
 * Invalid text buffer iterator: either the iterator is
 * uninitialized, or the characters/pixbufs/widgets in 
the
 * buffer have been modified since the iterator was 
created.
 * You must use marks, character numbers, or line 
numbers to
 * preserve a position across buffer modifications.
 * You can apply tags and insert marks without 
invalidating
 * your iterators, but any mutation that affects 
'indexable'
 * buffer contents (contents that can be referred to by 
character
 * offset) will invalidate all outstanding iterators
 */
gtk_text_buffer_get_iter_at_offset( buffer, , 
MAX_LENGTH-1 );
/*gtk_text_iter_backward_char(  );*/
/*gtk_text_buffer_get_iter_at_offset( buffer, , 
count );*/
gtk_text_buffer_get_end_iter( buffer,  );
/*gtk_text_iter_backward_char(  );*/
in = TRUE;
g_debug( "%s: count=%d, start=%d, end=%d",
thisfn, count, 
gtk_text_iter_get_offset(  ), gtk_text_iter_get_offset(  ));
gtk_text_buffer_delete( buffer, ,  );
in = FALSE;
}
}
}

As stated in the comment, the code works (the size if actually limited to 4095 
chars),
but each execution of gtk_text_buffer_delete() triggers the well-known warning
"Invalid text buffer iterator".

I am a bit stucked here, because I do not understand why this happens, as the 
buffer
is not modified between taking the iters and deleting the content...

Can anyone help me in this matter ?

Thanks in advance.
Regards
Pierre
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Re: gtk_text_buffer_delete ?

[Pierre Wieser]

> On the application I'm currently working on [1], I want limit the size of the
> [...]

I omit the application link, for reference ;)

[1] https://github.com/trychlos/openbook/
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Re: gtk_text_buffer_delete ?

[Jim Charlton]

On 15-10-07 04:14 AM, Pierre Wieser wrote:

Hello,

On the application I'm currently working on [1], I want limit the size of the
text entered in a GtkTextBuffer to those saved in the DBMS, so 4096 chars.

I so connected to the 'changed' signal of the GtkTextBuffer, and the handler
is :

static void
on_notes_changed( GtkTextBuffer *buffer, void *empty )
{
static const gchar *thisfn = "my_utils_on_notes_changed";
static const gint MAX_LENGTH = 4096;
static gboolean in = FALSE;
gint count;
GtkTextIter start, end;

/* prevent an infinite recursion */
if( !in ){
count = gtk_text_buffer_get_char_count( buffer );
if( count >= MAX_LENGTH ){
/*
 * this code works, but emit the following Gtk-Warning:
 *
 * Invalid text buffer iterator: either the iterator is
 * uninitialized, or the characters/pixbufs/widgets in 
the
 * buffer have been modified since the iterator was 
created.
 * You must use marks, character numbers, or line 
numbers to
 * preserve a position across buffer modifications.
 * You can apply tags and insert marks without 
invalidating
 * your iterators, but any mutation that affects 
'indexable'
 * buffer contents (contents that can be referred to by 
character
 * offset) will invalidate all outstanding iterators
 */
gtk_text_buffer_get_iter_at_offset( buffer, , 
MAX_LENGTH-1 );
/*gtk_text_iter_backward_char(  );*/
/*gtk_text_buffer_get_iter_at_offset( buffer, , 
count );*/
gtk_text_buffer_get_end_iter( buffer,  );
/*gtk_text_iter_backward_char(  );*/
in = TRUE;
g_debug( "%s: count=%d, start=%d, end=%d",
thisfn, count, gtk_text_iter_get_offset( 
 ), gtk_text_iter_get_offset(  ));
gtk_text_buffer_delete( buffer, ,  );
in = FALSE;
}
}
}

As stated in the comment, the code works (the size if actually limited to 4095 
chars),
but each execution of gtk_text_buffer_delete() triggers the well-known warning
"Invalid text buffer iterator".

I am a bit stucked here, because I do not understand why this happens, as the 
buffer
is not modified between taking the iters and deleting the content...

Can anyone help me in this matter ?

Thanks in advance.
Regards
Pierre
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I do not have an answer to the problem as stated, but I have written 
code that achieves the overall purpose of pruning the text buffer.

I work in Gtkmm rather than in GTK3.  Here is a snippet of code.
*
start = tb1_ptr->begin();
end = tb1_ptr->end();
if (end.get_offset() > 254) end.set_offset(254);
text = tb1_ptr->get_text(start, end, FALSE);

where
tb1_ptr = Gtk::TextBuffer::create();
Gtk::TextIter start;
Gtk::TextIter end;
Glib::ustring text;

In your case, rather than using gtk_text_buffer_delete, you would use
gtk_text_iter_get_offset (/|const GtkTextIter 
 *iter|/);

and
gtk_text_iter_set_offset (/|GtkTextIter 
 *iter|/, 
/|gint 
 
char_offset|/);


to limit the text buffer to your desired length.

Hope this helps...   Jim...




text = tb1_ptr->get_text(start, end, FALSE);
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Re: gtk_text_buffer_delete ?

[Stefan Salewski]

On Wed, 2015-10-07 at 13:14 +0200, Pierre Wieser wrote:
> Hello, 
> 
> On the application I'm currently working on [1], I want limit the size
> of the
> text entered in a GtkTextBuffer to those saved in the DBMS, so 4096
> chars.

Seen that:

http://www.gtkforums.com/viewtopic.php?t=1012

Very similar to your solution, but I think that was GTK2, and your is
GTK3.

No other idea, sorry.
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Re: gtk_text_buffer_delete ?

[Stefan Salewski]

On Wed, 2015-10-07 at 13:14 +0200, Pierre Wieser wrote:
> I so connected to the 'changed' signal of the GtkTextBuffer,

Maybe try connecting to insert-text signal -- changed signal may be
emitted again when you delete. See

http://stackoverflow.com/questions/2791035/how-do-i-set-buffer-limit-for
-gtk-text-view-in-c
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Re: gtk_text_buffer_delete ?

[Pierre Wieser]

On Wed, 2015-10-07 at 15:05 +0200, Stefan Salewski wrote:

> On Wed, 2015-10-07 at 13:14 +0200, Pierre Wieser wrote:
>> Hello, 
>> 
>> On the application I'm currently working on [1], I want limit the size
>> of the
>> text entered in a GtkTextBuffer to those saved in the DBMS, so 4096
>> chars.
>
> Seen that:
>
> http://www.gtkforums.com/viewtopic.php?t=1012
>
> Very similar to your solution, but I think that was GTK2, and your is
> GTK3.

Hi Stefan,

Thanks for your interest, but the thread you point to is actually the one
on which I based my own code.
I do not think that GTK2 vs GTK3 is a point in this matter, do you ?

> No other idea, sorry.

And Google has not been my friend further...
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