Nabble - Gtkmm

Re: Controlling the hardware volume

2009-11-25T15:38:03Z

Thanks! However I'm writing a recording application:
I want to change the mixer settings in order to get the microphone
signal from AlsaSrc. So, I need to set_record on the Mic and set
the recording volume on Capture (and AC97, I think). I'll also
set the rest to 0 ;).

On Wed, Nov 25, 2009 at 06:12:19PM -0500, José Alburquerque wrote:

> On Wed, 2009-11-25 at 01:04 -0500, José Alburquerque wrote:
> > Finally, another element you might consider when working with volume
> > control is the Gst::Volume plug-in. According to the docs here:
> >
> > http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-base-plugins/html/gst-plugins-base-plugins-volume.html
> >
> > It allows the control of the volume of audio through a pipeline.
>
> One other thing:
>
> The new update[1] in the docs from the bug I filed resulting from the
> original bug report you filed seems to suggest that the Gst::Mixer
> interface might not be the best way to control volume in an app. It
> suggests that either a Gst::Volume element or a Gst::Playbin be used in
> a pipeline, or use the audiosink's volume property if it has one.
>
> [1]
> http://cgit.freedesktop.org/gstreamer/gstreamer/commit/?id=5a1c788d9a58a032442ea09f091306640a0a7069
>
> --
> José
>
>

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hide scrolledWindow hscrollbar

2009-11-25T15:15:28Z

hi, i have a scrolledwindow containing a table, this table contains 10 * 100 custom widgets.

i wish to hide the hscrollbar but if i set it's policy to NEVER the scrollbar does hide but the window is now huge as its showing all the 10 * 100 controls at once.

how do i hide the hscrollbar but still give me normal functionality?

I hope you understand, it should be simple really.

Thanks.
Paul.

Re: Controlling the hardware volume

2009-11-25T15:12:19Z

On Wed, 2009-11-25 at 01:04 -0500, José Alburquerque wrote:
> Finally, another element you might consider when working with volume
> control is the Gst::Volume plug-in. According to the docs here:
>
> http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-base-plugins/html/gst-plugins-base-plugins-volume.html
>
> It allows the control of the volume of audio through a pipeline.

One other thing:

The new update[1] in the docs from the bug I filed resulting from the
original bug report you filed seems to suggest that the Gst::Mixer
interface might not be the best way to control volume in an app. It
suggests that either a Gst::Volume element or a Gst::Playbin be used in
a pipeline, or use the audiosink's volume property if it has one.

[1]
http://cgit.freedesktop.org/gstreamer/gstreamer/commit/?id=5a1c788d9a58a032442ea09f091306640a0a7069

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Re: How to get mute and record state of a mixer?

2009-11-25T15:03:37Z

On Wed, 2009-11-25 at 15:00 -0500, José Alburquerque wrote:

> On Wed, 2009-11-25 at 15:48 +0100, Carlo Wood wrote:
> > Gst::Mixer has
> >
> > set_volume, set_mute and set_record.
> >
> > But there is only get_volume.
> >
> > Why isn't there a get_mute and get_record?
> > Is that impossible, or is there another way I can get the current values?
>
> Gst::Mixer wraps only the API that the C API exposes. The GstMixer
> functions available just don't provide functionality for the functions
> you mention (see the GstMixer docs[1]).

You know, rechecking the docs, the C API does have a macro called
GST_MIXER_TRACK_HAS_FLAG() used to check what flags a Gst::MixerTrack
has. We'll try to add a convenience function for this. For now, using
the Gst::MixerTrack::property_flags() property and seeing if the
appropriate flag from Gst::MixerTrackFlags is set should work just as
well.

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Re: How to get mute and record state of a mixer?

2009-11-25T12:00:45Z

On Wed, 2009-11-25 at 15:48 +0100, Carlo Wood wrote:
> Gst::Mixer has
>
> set_volume, set_mute and set_record.
>
> But there is only get_volume.
>
> Why isn't there a get_mute and get_record?
> Is that impossible, or is there another way I can get the current values?

Gst::Mixer wraps only the API that the C API exposes. The GstMixer
functions available just don't provide functionality for the functions
you mention (see the GstMixer docs[1]).

You may want to look at the other alsa plug-ins such as Gst::AlsaSrc and
Gst::AlsaSink. Also, something that may be relevant in the GstMixer
docs is found in the gst_mixer_list_tracks()[2] method. I'll try to
update the docs in gstreamermm to reflect that. You may also file a bug
about that if you'd like so it is not forgotten. Thanks.

[1]
http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-base-libs/html/gst-plugins-base-libs-gstmixer.html
[2]
http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-base-libs/html/gst-plugins-base-libs-gstmixer.html#gst-mixer-list-tracks

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Re: Controlling the hardware volume

2009-11-25T11:59:27Z

On Wed, 2009-11-25 at 10:24 +0000, Chris Vine wrote:

> On Wed, 25 Nov 2009 01:04:06 -0500
> José Alburquerque <jaalburquerque@...> wrote:
> > On Tue, 2009-11-24 at 17:05 -0500, José Alburquerque wrote:
> > > The problem is that your trying to initialize a Glib::RefPtr<>&
> > > from a Glib::RefPtr<> (which the std::list<> contains). A
> > > std::list<> is not designed to store references.
> >
> > It doesn't seem clear what I was trying to say about lists not
> > "storing" references. I guess what I was trying to say is that I
> > think trying to extract a reference by dereferencing a
> > list<>::iterator is not doable. I was also trying to suggest another
> > way get at the contents of the list.
>
> You would expect std::list<T>::iterator::operator*() to return a
> reference rather than a value type (it does on my version of libstdc++),
> so it shouldn't fall foul of the preclusion of binding a temporary to a
> non-const reference.
>
> Isn't the explanation simply that Glib::RefPtr<Gst::MixerTrack> and
> Glib::RefPtr<Gst::MixerTrack const> are different types (as they are)?
>
> Glib::RefPtr<Gst::MixerTrack const> track = *iter (ie instantiating a
> new RefPtr object rather than a reference) should work because it will
> cause the templated version of the RefPtr's copy constructor to be
> invoked, which will allow implicit conversion of the RefPtr's value
> type.

Ah yes, that's right. I don't know why I didn't see it in my testing of
the code the OP posted. It is possible to do:

Glib::RefPtr<...>& var = *iter;

in the loop as long as the types aren't mixed. So as you say
dereferencing an iterator does in fact give back a reference.

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How to get mute and record state of a mixer?

2009-11-25T06:48:53Z

Gst::Mixer has

set_volume, set_mute and set_record.

But there is only get_volume.

Why isn't there a get_mute and get_record?
Is that impossible, or is there another way I can get the current values?

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Next Stable Version of glibmm

2009-11-25T06:04:25Z

Hi all,

when is the next stable Version of glibmm, containing Gio::Socket and
others, supposed to be released?

With regards

Michi
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Re: Controlling the hardware volume

2009-11-25T02:24:59Z

On Wed, 25 Nov 2009 01:04:06 -0500
José Alburquerque <jaalburquerque@...> wrote:

> On Tue, 2009-11-24 at 17:05 -0500, José Alburquerque wrote:
> > The problem is that your trying to initialize a Glib::RefPtr<>&
> > from a Glib::RefPtr<> (which the std::list<> contains). A
> > std::list<> is not designed to store references.
>
> It doesn't seem clear what I was trying to say about lists not
> "storing" references. I guess what I was trying to say is that I
> think trying to extract a reference by dereferencing a
> list<>::iterator is not doable. I was also trying to suggest another
> way get at the contents of the list.

You would expect std::list<T>::iterator::operator*() to return a
reference rather than a value type (it does on my version of libstdc++),
so it shouldn't fall foul of the preclusion of binding a temporary to a
non-const reference.

Isn't the explanation simply that Glib::RefPtr<Gst::MixerTrack> and
Glib::RefPtr<Gst::MixerTrack const> are different types (as they are)?

Glib::RefPtr<Gst::MixerTrack const> track = *iter (ie instantiating a
new RefPtr object rather than a reference) should work because it will
cause the templated version of the RefPtr's copy constructor to be
invoked, which will allow implicit conversion of the RefPtr's value
type.

Chris

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Controlling the hardware volume

2009-11-24T22:04:06Z

On Tue, 2009-11-24 at 17:05 -0500, José Alburquerque wrote:
> The problem is that your trying to initialize a Glib::RefPtr<>& from a
> Glib::RefPtr<> (which the std::list<> contains). A std::list<> is not
> designed to store references.

It doesn't seem clear what I was trying to say about lists not "storing"
references. I guess what I was trying to say is that I think trying to
extract a reference by dereferencing a list<>::iterator is not doable.
I was also trying to suggest another way get at the contents of the
list.

There are other ways to access the list, of course.
std::list<>::pop_front(), for example, removes the first element of the
list and std::list<>::front() does in fact return a reference so it
would be fine to initialize a Glib::RefPtr<>& with the result from that.
I'm sure you probably know all this, but in case you don't I might as
well add this comment in case it helps further.

Also, from the docs, a std::vector can be used instead of std::list.

Finally, another element you might consider when working with volume
control is the Gst::Volume plug-in. According to the docs here:

http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-base-plugins/html/gst-plugins-base-plugins-volume.html

It allows the control of the volume of audio through a pipeline. I hope
this all might be useful.

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Re: ANNOUNCE: gstreamermm-0.10.5

2009-11-24T14:05:57Z

On Tue, 2009-11-24 at 13:55 +0100, Carlo Wood wrote:

> Hi, I have another question about gstreamermm. Trying to print the volume
> of the given tracks:
>
> // List the tracks of the mixer.
> typedef std::list<Glib::RefPtr<Gst::MixerTrack> > tracks_type;
> tracks_type tracks = mixer->list_tracks();
>
> for (tracks_type::iterator iter = tracks.begin(); iter != tracks.end(); ++iter)
> {
> Glib::RefPtr<Gst::MixerTrack const>& track = *iter;
> std::cout << track->get_label() << ' ' << mixer->get_volume(track) << std::endl;
> }
>
>
> This doesn't work... First I tried get_volume(*iter) but that can't find
> a 'get_volume', because the only get_volume that is there demands a
> Glib::RefPtr<Gst::MixerTrack const> (note the 'const').
>
> So, I tried to convert *iter (which is a Glib::RefPtr<Gst::MixerTrack>)
> to a Glib::RefPtr<Gst::MixerTrack const> in the line before, and indeed,
> that fails.
>
> How am I supposed to get the volume of the tracks now?

The problem is that your trying to initialize a Glib::RefPtr<>& from a
Glib::RefPtr<> (which the std::list<> contains). A std::list<> is not
designed to store references. You should just do something like:

Glib::RefPtr<..> ref = *iter;

Also, the std::cout line cannot work because the
"mixer->get_volume(track)" returns an array of integers.

I would suggest that you make sure you follow the docs so that you know
what is supported. One good chapter as far as ArrayHandle and
ListHandle is in the "Intermediate types" section[1] of the online
book[2].

[1]
http://library.gnome.org/devel/gtkmm-tutorial/unstable/sec-intermediate-types.html.en
[2] http://www.gtkmm.org/docs/gtkmm-2.4/docs/tutorial/html/index.html

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Re: ANNOUNCE: gstreamermm-0.10.5

2009-11-24T04:55:17Z

Hi, I have another question about gstreamermm. Trying to print the volume
of the given tracks:

// List the tracks of the mixer.
typedef std::list<Glib::RefPtr<Gst::MixerTrack> > tracks_type;
tracks_type tracks = mixer->list_tracks();

for (tracks_type::iterator iter = tracks.begin(); iter != tracks.end(); ++iter)
{
Glib::RefPtr<Gst::MixerTrack const>& track = *iter;
std::cout << track->get_label() << ' ' << mixer->get_volume(track) << std::endl;
}

This doesn't work... First I tried get_volume(*iter) but that can't find
a 'get_volume', because the only get_volume that is there demands a
Glib::RefPtr<Gst::MixerTrack const> (note the 'const').

So, I tried to convert *iter (which is a Glib::RefPtr<Gst::MixerTrack>)
to a Glib::RefPtr<Gst::MixerTrack const> in the line before, and indeed,
that fails.

How am I supposed to get the volume of the tracks now?

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Re: How to add a custom cell renderer to a Gtk::IconView

2009-11-23T11:31:57Z

Thank you so much for your time and help! It worked as you suggested.

On 11/22/2009 11:38 PM, Jos Alburquerque wrote:

> On Sun, 2009-11-22 at 20:57 -0500, Todor Todorov wrote:
>
>> Thanks again for the reply.
>>
>> It is not a problem to implement the renderer in gtkmm - as a matter of
>> fact that's the first thing I did. As you know though, I can't add it to
>> a Gtk::IconView, because it does not implement the CellLayout interface.
>> That bit of info was in your first reply.
>>
> Yes, I did mention the problem with Gtk::IconView not yet implementing
> the Gtk::CellLayout interface. I could be wrong, but what I was sort of
> suggesting is that if you have the gtkmm cell renderer, you use it's
> gobj() where necessary in your posted code. For example, your code
> would look like the following (the lines that have been modified are
> distinguished with an asterisk as the first character):
>
> ...
> Gtk::IconView *browser = 0;
> builder->get_widget( "browser", browser );
> {
> GtkIconView *view = browser->gobj();
> * Gtk::CellRenderer *cell = Gtk::CellRendererThumb::create();
> * gtk_cell_layout_pack_start( GTK_CELL_LAYOUT( view ),
> cell->gobj(), FALSE );
>
> * // Set cell renderer properties here using gtkmm
>
> * gtk_cell_layout_set_attributes( GTK_CELL_LAYOUT( view ),
> cell->gobj(),
> "thumb-name", 0, "thumb-date",
> 1,
> "thumb-image", 2,
> "thumb-checked", 3,
> "thumb-duplicate", 4, NULL );
>
> * // Connect to cell signals here using sigc
> }
> browser->set_model( thumblist );
> ...
>
> Now, of course, I'm by far not an expert so I'm just guessing.
>
>
>> I guess I will have to look into subclassing Gtk::IconView itself ... Do
>> you know of any examples for that? I suspect deriving from Gtk::ListView
>> will be easier, and I'll find more code I could look up and take a note
>> from, but I have no idea how to make the new class order the items in
>> multiple columns.
>>
> I don't have examples but others may. The online book has good
> information on custom widgets in chapter 25[1]. Also the
> gtkmm-documentation package[2] has examples.
>
> [1]
> http://library.gnome.org/devel/gtkmm-tutorial/unstable/chapter-customwidgets.html.en
> [2]http://ftp.gnome.org/pub/GNOME/sources/gtkmm-documentation/
>
>

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Re: ANNOUNCE: gstreamermm-0.10.5

2009-11-23T03:51:22Z

On Sun, Nov 22, 2009 at 11:38:30PM -0500, José Alburquerque wrote:
> https://bugzilla.gnome.org/enter_bug.cgi?product=gstreamermm

Done, https://bugzilla.gnome.org/show_bug.cgi?id=602716

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another documentation bug

2009-11-23T02:39:13Z

This function description:
http://library.gnome.org/devel/gtkmm/unstable/classGtk_1_1TreeModelFilter.html#a1dfd71e0b35937d70cf7615c982cb09d

is copypasted from treemodelsort. It should state filtered row instead
of sorted row.

Should I file these in bugzilla to get it fixed?
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Re: wanna show check box in Gtk::TreeView column

2009-11-23T00:56:39Z

You can use:
void Gtk::TreeViewColumn::set_widget(Gtk::Widget& widget)
http://library.gnome.org/devel/gtkmm/unstable/classGtk_1_1TreeViewColumn.html#a3b8c4e3b7e8b579090440c50843efd26

Though it can only set the widget inside the TreeViewColumn button. If
you want to place it - let's say - next to the column header button, you
have to rewrite Gtk+ code.

Gitanshu Mehndiratta wrote:

> Hi All,
>
> I am showing Gtk::CheckButton in a Gtk::TreeView one column. Now i want
> to show Gtk::CheckButton in place of column name also. So that by
> selecting that all the rows checkButton should be selected.
>
> I basically want to know how to chow Gtk::CheckButton in Gtk::TreeView
> column,
>
> Thanks,
> Gitanshu
>
>
> ------------------------------------------------------------------------
>
> _______________________________________________
> gtkmm-list mailing list
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wanna show check box in Gtk::TreeView column

2009-11-23T00:50:40Z

Hi All,

I am showing Gtk::CheckButton in a Gtk::TreeView one column. Now i want to show Gtk::CheckButton in place of column name also. So that by selecting that all the rows checkButton should be selected.

I basically want to know how to chow Gtk::CheckButton in Gtk::TreeView column,

Thanks,
Gitanshu

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Re: Gtkmm and mysql help

2009-11-22T23:21:06Z

On Sat, 2009-11-21 at 09:31 +0530, sankar bose wrote:
> Thanks for your quick response.
> and thank you for giving me a direction to study.I am going to use
> libgdamm.
> can you please explain a little bit
> Gnome::Gda::Connection::open_from_string function,
> i cant understand how to make a connection string for MySQL

This should be helpful:
http://library.gnome.org/devel/libgda/unstable/GdaConnection.html#gda-connection-open-from-string

The "simple" libgdamm example creates a connection string here:
http://git.gnome.org/cgit/libgdamm/tree/examples/simple/main.cc#n180
and I create a more complicated one here in Glom:
http://git.gnome.org/cgit/glom/tree/glom/libglom/connectionpool_backends/postgres.cc#n60

> and i
> have a another
> question how to use regular expression in gtkmm

Glib::Regex can do that. I haven't used it much myself.
http://library.gnome.org/devel/glibmm/unstable/classGlib_1_1Regex.html

> and could you
> name a database related project ( MySQL) in gtkmm so i can learn
> from it.

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Re: How to add a custom cell renderer to a Gtk::IconView

2009-11-22T20:38:59Z

On Sun, 2009-11-22 at 20:57 -0500, Todor Todorov wrote:
> Thanks again for the reply.
>
> It is not a problem to implement the renderer in gtkmm - as a matter of
> fact that's the first thing I did. As you know though, I can't add it to
> a Gtk::IconView, because it does not implement the CellLayout interface.
> That bit of info was in your first reply.

Yes, I did mention the problem with Gtk::IconView not yet implementing
the Gtk::CellLayout interface. I could be wrong, but what I was sort of
suggesting is that if you have the gtkmm cell renderer, you use it's
gobj() where necessary in your posted code. For example, your code
would look like the following (the lines that have been modified are
distinguished with an asterisk as the first character):

...
Gtk::IconView *browser = 0;
builder->get_widget( "browser", browser );
{
GtkIconView *view = browser->gobj();
* Gtk::CellRenderer *cell = Gtk::CellRendererThumb::create();
* gtk_cell_layout_pack_start( GTK_CELL_LAYOUT( view ),
cell->gobj(), FALSE );

* // Set cell renderer properties here using gtkmm

* gtk_cell_layout_set_attributes( GTK_CELL_LAYOUT( view ),
cell->gobj(),
"thumb-name", 0, "thumb-date",
1,
"thumb-image", 2,
"thumb-checked", 3,
"thumb-duplicate", 4, NULL );

* // Connect to cell signals here using sigc
}
browser->set_model( thumblist );
...

Now, of course, I'm by far not an expert so I'm just guessing.

> I guess I will have to look into subclassing Gtk::IconView itself ... Do
> you know of any examples for that? I suspect deriving from Gtk::ListView
> will be easier, and I'll find more code I could look up and take a note
> from, but I have no idea how to make the new class order the items in
> multiple columns.

I don't have examples but others may. The online book has good
information on custom widgets in chapter 25[1]. Also the
gtkmm-documentation package[2] has examples.

[1]
http://library.gnome.org/devel/gtkmm-tutorial/unstable/chapter-customwidgets.html.en
[2] http://ftp.gnome.org/pub/GNOME/sources/gtkmm-documentation/

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Re: ANNOUNCE: gstreamermm-0.10.5

2009-11-22T20:38:30Z

On Sun, 2009-11-22 at 14:36 +0100, Carlo Wood wrote:
> Hi, I'm trying to use gstreamermm, but run into problems.
> Anything I'm doing wrong here:
>
> hikaru:~/projects/speech/speech-objdir/src>./speech
>
> ** (speech:16125): CRITICAL **: gst_alsa_mixer_element_list_tracks: assertion `this->mixer != NULL' failed

This looks like a bug. Could you file a bugzilla report here please:

https://bugzilla.gnome.org/enter_bug.cgi?product=gstreamermm

> The relevant code is:
> [...]
> int
> main (int argc, char *argv[])
> {
> Gtk::Main kit(argc, argv);
> Gst::init(argc, argv);
>
> // mixer gives access to the alsamixer.
> Glib::RefPtr<Gst::Mixer> mixer = Gst::AlsaMixer::create("mixer");
>
> if(!mixer)
> {
> std::cerr << "The mixer could not be created." << std::endl;
> return -1;
> }
>
> // List the tracks of the mixer.
> typedef Glib::ListHandle<Glib::RefPtr<Gst::MixerTrack> > mixer_list_handle_type;
> mixer_list_handle_type mixer_list_handle = mixer->list_tracks(); // THIS LINE CAUSES THE ERROR
> [...]

The only thing I think is wrong is that getting tracks from a mixer
should be done using standard C++ containers like so:

std::list< Glib::RefPtr<Gst::MixerTrack> > tracks = mixer->get_tracks();

or:

std::list< Glib::RefPtr<const Gst::MixerTrack> > tracks =
mixer->get_tracks();

However, once the above bug is fixed getting tracks as above should work
just fine.

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Re: How to add a custom cell renderer to a Gtk::IconView

2009-11-22T17:57:44Z

Thanks again for the reply.

It is not a problem to implement the renderer in gtkmm - as a matter of
fact that's the first thing I did. As you know though, I can't add it to
a Gtk::IconView, because it does not implement the CellLayout interface.
That bit of info was in your first reply.

I guess I will have to look into subclassing Gtk::IconView itself ... Do
you know of any examples for that? I suspect deriving from Gtk::ListView
will be easier, and I'll find more code I could look up and take a note
from, but I have no idea how to make the new class order the items in
multiple columns.

Best regads,

Todor

On 11/22/2009 05:20 AM, Jos Alburquerque wrote:

> On Fri, 2009-11-20 at 23:59 -0500, Todor Todorov wrote:
>
>> Thanks for the reply. I only recently subscribed to the list and need
>> yet to find a searchable archive online, with somewhat usable
>> interface... Anyway, I really appreciate your time in helping me solve
>> this problem.
>>
>
>> > From the main gtkmm page[1], select the Mailing Lists link. The "List
>>
> Archives" section provides links to searchable archives.
>
> [1] http://www.gtkmm.org/index.shtml
>
>
>> The only thing I don't know how to do is how to adapt the C/gtk+
>> renderer to the gtkmm/sigc signal-slot mechanism. My custom renderer has
>> a vfunc declared in the (gtk+ _class) struct as:
>>
>> void ( *toggled )( GtkCellRendererThumb* renderer, gchar* path, gpointer
>> data );
>>
>> I obviously need it in order to tell the model when a thumbnail in my
>> icon view has been permanently selected via its checkbox.
>>
> It should be possible to wrap the renderer object in a Gtk::CellRenderer
> casting it to a GtkCellRenderer and using Glib::wrap(). Using the
> standard Gtk::Renderer signals would then be possible. On the other
> hand, you could also implement your renderer in C++. There are two good
> good examples of how to do that here:
>
> http://git.gnome.org/cgit/gtkmm-documentation/tree/examples/others/cellrenderercustom
>
>
>> I tried the
>> following:
>> ...
>> Gtk::IconView *browser = 0;
>> builder->get_widget( "browser", browser );
>> {
>> GtkIconView *view = browser->gobj();
>> GtkCellRenderer *cell = gtk_cell_renderer_thumb_new();
>> gtk_cell_layout_pack_start( GTK_CELL_LAYOUT( view ), cell, FALSE );
>> g_object_set( cell, "thumb-checkable", TRUE, "xpad", 2, "ypad",
>> 2, NULL );
>> gtk_cell_layout_set_attributes( GTK_CELL_LAYOUT( view ), cell,
>> "thumb-name", 0, "thumb-date", 1,
>> "thumb-image", 2,
>> "thumb-checked", 3,
>> "thumb-duplicate", 4, NULL );
>> g_signal_connect( G_OBJECT( cell ), "toggled", G_CALLBACK(
>> &MainWindow::on_thumbnail_checked ), NULL );
>> }
>> browser->set_model( thumblist );
>> ...
>>
>> The callback is a member function declared as
>>
>> void on_thumbnail_checked( GtkCellRendererThumb* renderer, gchar* path,
>> gpointer data )
>> {
>> std::cout<< "test, path is "<< path<< std::endl;
>> }
>>
>> Everything works up to the call of the function. It is called once, the
>> first time one of the thumbnails is activated, and it prints out "test,
>> path is".
>> Any subsequent click on a thumbnail does not trigger the callback,
>> although the activate function of the renderer itself is called every
>> time - verified thorugh g_print statements, which print out the tree
>> path as well....
>>
> Maybe the signal emission implementation in you renderer class is a
> little off. If the callback function is called once then it seems that
> the mechanism does work, just not exactly as desired. The logic may
> need a little consideration. For example, does the logic of the
> renderer class dictate that the signal be emitted when the checkbox is
> toggled? only selected? Is the class designed so that the signal is
> emitted when the icon is clicked? etc. It's hard to know for certain
> but these are just ideas to possibly help get your own ideas working.
>
>

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Re: ANNOUNCE: gstreamermm-0.10.5

2009-11-22T05:36:09Z

Hi, I'm trying to use gstreamermm, but run into problems.
Anything I'm doing wrong here:

hikaru:~/projects/speech/speech-objdir/src>./speech

** (speech:16125): CRITICAL **: gst_alsa_mixer_element_list_tracks: assertion `this->mixer != NULL' failed

The relevant code is:
[...]
int
main (int argc, char *argv[])
{
Gtk::Main kit(argc, argv);
Gst::init(argc, argv);

// mixer gives access to the alsamixer.
Glib::RefPtr<Gst::Mixer> mixer = Gst::AlsaMixer::create("mixer");

if(!mixer)
{
std::cerr << "The mixer could not be created." << std::endl;
return -1;
}

// List the tracks of the mixer.
typedef Glib::ListHandle<Glib::RefPtr<Gst::MixerTrack> > mixer_list_handle_type;
mixer_list_handle_type mixer_list_handle = mixer->list_tracks(); // THIS LINE CAUSES THE ERROR
[...]

--
Carlo Wood <carlo@...>

PS Note that using typedef Glib::ListHandle<Glib::RefPtr<const Gst::MixerTrack> > mixer_list_handle_type;
doesn't even compile:
/usr/include/glibmm-2.4/glibmm/listhandle.h:45: error: no match for ‘operator--’ in ‘--pend’

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Re: How to add a custom cell renderer to a Gtk::IconView

2009-11-22T02:20:16Z

On Fri, 2009-11-20 at 23:59 -0500, Todor Todorov wrote:
> Thanks for the reply. I only recently subscribed to the list and need
> yet to find a searchable archive online, with somewhat usable
> interface... Anyway, I really appreciate your time in helping me solve
> this problem.

>From the main gtkmm page[1], select the Mailing Lists link. The "List
Archives" section provides links to searchable archives.

[1] http://www.gtkmm.org/index.shtml

> The only thing I don't know how to do is how to adapt the C/gtk+
> renderer to the gtkmm/sigc signal-slot mechanism. My custom renderer has
> a vfunc declared in the (gtk+ _class) struct as:
>
> void ( *toggled )( GtkCellRendererThumb* renderer, gchar* path, gpointer
> data );
>
> I obviously need it in order to tell the model when a thumbnail in my
> icon view has been permanently selected via its checkbox.

It should be possible to wrap the renderer object in a Gtk::CellRenderer
casting it to a GtkCellRenderer and using Glib::wrap(). Using the
standard Gtk::Renderer signals would then be possible. On the other
hand, you could also implement your renderer in C++. There are two good
good examples of how to do that here:

http://git.gnome.org/cgit/gtkmm-documentation/tree/examples/others/cellrenderercustom

> I tried the
> following:
> ...
> Gtk::IconView *browser = 0;
> builder->get_widget( "browser", browser );
> {
> GtkIconView *view = browser->gobj();
> GtkCellRenderer *cell = gtk_cell_renderer_thumb_new();
> gtk_cell_layout_pack_start( GTK_CELL_LAYOUT( view ), cell, FALSE );
> g_object_set( cell, "thumb-checkable", TRUE, "xpad", 2, "ypad",
> 2, NULL );
> gtk_cell_layout_set_attributes( GTK_CELL_LAYOUT( view ), cell,
> "thumb-name", 0, "thumb-date", 1,
> "thumb-image", 2,
> "thumb-checked", 3,
> "thumb-duplicate", 4, NULL );
> g_signal_connect( G_OBJECT( cell ), "toggled", G_CALLBACK(
> &MainWindow::on_thumbnail_checked ), NULL );
> }
> browser->set_model( thumblist );
> ...
>
> The callback is a member function declared as
>
> void on_thumbnail_checked( GtkCellRendererThumb* renderer, gchar* path,
> gpointer data )
> {
> std::cout << "test, path is " << path << std::endl;
> }
>
> Everything works up to the call of the function. It is called once, the
> first time one of the thumbnails is activated, and it prints out "test,
> path is".
> Any subsequent click on a thumbnail does not trigger the callback,
> although the activate function of the renderer itself is called every
> time - verified thorugh g_print statements, which print out the tree
> path as well....

Maybe the signal emission implementation in you renderer class is a
little off. If the callback function is called once then it seems that
the mechanism does work, just not exactly as desired. The logic may
need a little consideration. For example, does the logic of the
renderer class dictate that the signal be emitted when the checkbox is
toggled? only selected? Is the class designed so that the signal is
emitted when the icon is clicked? etc. It's hard to know for certain
but these are just ideas to possibly help get your own ideas working.

--
José

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Gnome::Gda::DataSelect & Gnome::Gda::DataModel

2009-11-21T13:46:18Z

I am getting a compile time error when trying to pass a
Glib::RefPtr<Gnome::Gda::DataSelect> to a function accepting
Glib::RefPtr<Gnome::Gda::DataModel> &. It complains about a mismatch
in the types. Since DataSelect is an implementation of DataModel, I am
confused.

A bit of background:

I need to invoke the compute_modification_statements method on the
pointer returned from statement_execute_select. So I have used
Glib::RefPtr<Gnome::Gda::DataSelect>::cast_dynamic on the DataModelPtr
and stored it as a DataSelectPtr. However I am unable to pass this
later as a DataModelPtr to methods.

Am I doing something wrong? I discussed this with Siavash on IRC, but
could not figure out much.

Thanks,
Debarshi
--
One reason that life is complex is that it has a real part and an
imaginary part.
-- Andrew Koenig
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Re: How to add a custom cell renderer to a Gtk::IconView

2009-11-20T20:59:20Z

Thanks for the reply. I only recently subscribed to the list and need
yet to find a searchable archive online, with somewhat usable
interface... Anyway, I really appreciate your time in helping me solve
this problem.

The only thing I don't know how to do is how to adapt the C/gtk+
renderer to the gtkmm/sigc signal-slot mechanism. My custom renderer has
a vfunc declared in the (gtk+ _class) struct as:

void ( *toggled )( GtkCellRendererThumb* renderer, gchar* path, gpointer
data );

I obviously need it in order to tell the model when a thumbnail in my
icon view has been permanently selected via its checkbox. I tried the
following:
...
Gtk::IconView *browser = 0;
builder->get_widget( "browser", browser );
{
GtkIconView *view = browser->gobj();
GtkCellRenderer *cell = gtk_cell_renderer_thumb_new();
gtk_cell_layout_pack_start( GTK_CELL_LAYOUT( view ), cell, FALSE );
g_object_set( cell, "thumb-checkable", TRUE, "xpad", 2, "ypad",
2, NULL );
gtk_cell_layout_set_attributes( GTK_CELL_LAYOUT( view ), cell,
"thumb-name", 0, "thumb-date", 1,
"thumb-image", 2,
"thumb-checked", 3,
"thumb-duplicate", 4, NULL );
g_signal_connect( G_OBJECT( cell ), "toggled", G_CALLBACK(
&MainWindow::on_thumbnail_checked ), NULL );
}
browser->set_model( thumblist );
...

The callback is a member function declared as

void on_thumbnail_checked( GtkCellRendererThumb* renderer, gchar* path,
gpointer data )
{
std::cout << "test, path is " << path << std::endl;
}

Everything works up to the call of the function. It is called once, the
first time one of the thumbnails is activated, and it prints out "test,
path is".
Any subsequent click on a thumbnail does not trigger the callback,
although the activate function of the renderer itself is called every
time - verified thorugh g_print statements, which print out the tree
path as well....

Obviously I'm doing something wrong, but what exactly? I could not find
any examples that not only mix gtk+ and gtkmm widgets, but also glib and
sigc signaling.

I would appreciate an example and/or a hint very much! Thanks in advance.

Best regards,

Todor

On 11/20/2009 12:32 AM, Jos Alburquerque wrote:

> On Tue, 2009-11-17 at 22:58 -0500, Todor Todorov wrote:
>
>> I need to clarify. What I tried was:
>>
>> Glib::RefPtr<Gtk::CellLayout> cl = Glib::wrap( GTK_CELL_LAYOUT( my_icon_view.gobj() ) );
>>
>>
>> And the error was: "Glib::wrap_auto_interface(): The C++ instance
>> (N3Gtk8IconViewE) does not dynamic_cast to the interface."
>>
>>
>> On 11/17/2009 10:47 PM, Todor Todorov wrote:
>>
>>> Hello list,
>>>
>>> I encountered the following problem: Under Gtk+ it is possible to have a
>>> GktIconView and cast it to a GtkCellLayout via the GTK_CELL_LAYOUT(obj)
>>> macro. Then I could add a custom cell renderer and set attributes to it.
>>>
>>> Now I have implemented my cell renderer in C++/Gtkmm and would like to
>>> add it to my Gtk::IconView. And since the class does not provide a
>>> pack_start() functionality like TreeView, I would have to go and find my
>>> own way to do it...
>>>
>>> The first problem is that the IconView class does not inherit (in the
>>> traditional C++ way) from Gtk::CellLayout. Second, the
>>> reinterpret_cast<> did not work either. There is no function in the
>>> Gtk::IconView API that lets me convert to a CellLayout, or in the
>>> Gtk::CellLayout API to create it from an IconView... Third, I tried to
>>> do something like
>>>
>>> Gtk::CellLayout *cl = Glib::wrap( GTK_CELL_LAYOUT( my_icon_view.gobj() ) );
>>> cl->pack_start( renderer, false );
>>> cl->add_attribute( renderer->property_blah(), columns.blah );
>>> ....
>>>
>>> While it compiles, the application crashed with a reinterpret_cast
>>> failure reported. The only thing that worked so far was to take my Gtk+
>>> implementation of the renderer, add it to my project and create a
>>> GtkIconView, cast it to GTK_CELL_LAYOUT, add the renderer with
>>> properties, and at the end wrap it into a Gtk::IconView and work from
>>> there as it were pure Gtkmm.
>>>
>>> I wonder though, is this the best way? I would like to not handle Gtk+
>>> objects directly in my code. Can anyone make a suggestion as to how to
>>> add a custom cell renderer to a Gtk::IconView in a "best practice"
>>> approach? Your help and time are greatly appreciated.
>>>
> The problem is that Gtk::IconView does not implement the Gtk::CellLayout
> interface because the change was done in Gtk+ at a time when gtkmm could
> not break ABI (I think searching on the list will provide more info).
> For now you're probably doing it the right way until the change can be
> made to gtkmm.
>
>

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Re: How to add a custom cell renderer to a Gtk::IconView

2009-11-20T20:49:09Z

Thanks for the reply. The only thing I don't know how to do is how to
adapt the C/gtk+ renderer to the gtkmm/sigc signal-slot mechanism. My
custom renderer has a vfunc declared in the class as:

void ( *toggled )( GtkCellRendererThumb* renderer, gchar* path, gpointer
data );

I obviously need it in order to tell the model when a thumbnail in my
icon view has been permanently selected via its checkbox. I tried the
following:
...
Gtk::IconView *browser = 0;
builder->get_widget( "browser", browser );
{
GtkIconView *view = browser->gobj();
GtkCellRenderer *cell = gtk_cell_renderer_thumb_new();
gtk_cell_layout_pack_start( GTK_CELL_LAYOUT( view ), cell, FALSE );
g_object_set( cell, "thumb-checkable", TRUE, "xpad", 2, "ypad",
2, NULL );
gtk_cell_layout_set_attributes( GTK_CELL_LAYOUT( view ), cell,
"thumb-name", 0, "thumb-date", 1,
"thumb-image", 2,
"thumb-checked", 3,
"thumb-duplicate", 4, NULL );
g_signal_connect( G_OBJECT( cell ), "toggled", G_CALLBACK(
&MainWindow::on_thumbnail_checked ), NULL );
}
browser->set_model( thumblist );
...

The callback is a member function declared as

Everything works up to the call of

On 11/20/2009 12:32 AM, Jos Alburquerque wrote:

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Re: Gtkmm and mysql help

2009-11-20T20:01:02Z

Thanks for your quick response.
and thank you for giving me a direction to study.I am going to use
libgdamm.
can you please explain a little bit
Gnome::Gda::Connection::open_from_string function,
i cant understand how to make a connection string for MySQL and i
have a another
question how to use regular expression in gtkmm and could you
name a database related project ( MySQL) in gtkmm so i can learn
from it.

with regards.........................

On 11/20/09, Murray Cumming <murrayc@...> wrote:

> On Fri, 2009-11-20 at 16:56 +0530, sankar bose wrote:
>> Hi
>> everybody
>> i have to make a mysql app in gtkmm , i am completely new to c++
>> (just learning).
>> Please can anybody give me a tutorial on this topic , i
>> mean how to use gtkmm and
>> mysql ,packages that i have to download, how to send sql
>> commands to mysql
>> server and display the results in gtkmm ( Label or in the
>> Entry). A simple example
>> will be enough .Thanks in advance .
>
> I strongly recommend that you use libgda or libgdamm. Not only is it a
> better API but you then have some built-in backend independence. MySQL's
> own APIs are awful.
>
>
> --
> murrayc@...
> www.murrayc.com
> www.openismus.com
>
>

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Re: Gtkmm and mysql help

2009-11-20T05:37:41Z

On Fri, 2009-11-20 at 16:56 +0530, sankar bose wrote:

> Hi
> everybody
> i have to make a mysql app in gtkmm , i am completely new to c++
> (just learning).
> Please can anybody give me a tutorial on this topic , i
> mean how to use gtkmm and
> mysql ,packages that i have to download, how to send sql
> commands to mysql
> server and display the results in gtkmm ( Label or in the
> Entry). A simple example
> will be enough .Thanks in advance .

I strongly recommend that you use libgda or libgdamm. Not only is it a
better API but you then have some built-in backend independence. MySQL's
own APIs are awful.

--
murrayc@...
www.murrayc.com
www.openismus.com

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Re: Login-session-wide accelerators?

2009-11-20T04:14:16Z

On Mon, Oct 19, 2009 at 7:39 AM, Fatman_UK <fatman@...> wrote:

>
> Hi all! Gtkmm newbie here.
>
> Apologies if this has been posted already. Searched but didn't find it. I
> looked at AccelMaps in the online Doxygen pages, but got confused.
>
> My program starts at login and runs in the background. There is a hidden
> window. When the user presses a (configurable) hotkey combo - for instance,
> Super+W - the window shows itself.
>
> That's the plan, anyway. I can't figure out how to assign a hotkey that
> works regardless of which window has focus (including the desktop).
>
> Can someone point me to some relevant docs? I did think of assigning a
> hotkey in [name of window manager], but I want this to be crossplatform so
> ideally I'd like to do it in Gtkmm.

there is really no straightforward way to do this. gtkmm and gtk
primarily concern themselves with the needs of normal GUI
applications, and at least under X Window, the concept of getting
notified of *all* key events, whether they occured while your window
had key focus (let alone being unmapped) instantly puts it into
"non-normal GUI applications". obviously, it is possible to do this -
window managers do it. and obviously it is possible to do this in the
context of gtk/gtkmm, since the metacity WM was written using GTK.
however, i believe its not possible to do with just GTK calls - i
believe you need some interaction with the underlying windowing system
(X, Aqua, win32's GDI or whatever). and clearly you need to plan for
the situation that your desires are overridden by the "real" WM or
some other similar application that wants to look at, and potentially
handle, the same key events as you.
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Gtkmm and mysql help

2009-11-20T03:26:45Z

Hi
everybody
i have to make a mysql app in gtkmm , i am completely new to c++
(just learning).
Please can anybody give me a tutorial on this topic , i
mean how to use gtkmm and
mysql ,packages that i have to download, how to send sql
commands to mysql
server and display the results in gtkmm ( Label or in the
Entry). A simple example
will be enough .Thanks in advance .

With regards................
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Documentation of TreeSelection::set_select_function SlotSelect

2009-11-20T01:28:16Z

The docs of SlotSelect here:
http://library.gnome.org/devel/gtkmm/unstable/classGtk_1_1TreeSelection.html#a7c408b8e2b45b4a65a2a9ad66d9602cf

points to a general sigc docs, which is useless here. It should point to
something like this:

/** For instance, bool on_select_function(const
Glib::RefPtr<TreeModel>& model, const TreeModel::Path& path, bool
path_currently_selected)
* The select function should return true if the state of the node
may be toggled,
* and false if the state of the node should be left unchanged.
*/
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Re: Custom CellRenderer

2009-11-19T22:41:14Z

Check out these screenshots, the cellrenderers used are pretty similar to what you describe.

http://code.google.com/p/gejengel/wiki/Screenshots

The code is available here: http://code.google.com/p/gejengel/source/browse/trunk/src/ui/cellrendereralbum.cpp

Dirk

Hi Dirk
Thank you for the links but this is not what I need, this could be done easily with gtkmm.
I attach a image made with Glade to show something similar to what I need.

Greetings
Jamf

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shot.png (7K) Download Attachment

Re: How to add a custom cell renderer to a Gtk::IconView?

2009-11-19T21:33:10Z

On Thu, 2009-11-19 at 23:35 -0500, Todor Todorov wrote:
> Hello list,
>
> I apologize for repeating myself, but after a couple of days of trial
> and errors - mostly errors - I am at my wits' end.
>
> Could anyone give an example ( or point me to an application ) on how to
> add a custom Gtk::CellRenderer to a Gtk::IconView? I looked on my own
> but did not find any pointers. It would be preferable, if the cell
> renderer is implemented in Gtkmm, so it supports sigc signals and slots...

I hope the reply to your original posts helps.

--
José

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Re: How to add a custom cell renderer to a Gtk::IconView

2009-11-19T21:32:52Z

On Tue, 2009-11-17 at 22:58 -0500, Todor Todorov wrote:

> I need to clarify. What I tried was:
>
> Glib::RefPtr<Gtk::CellLayout> cl = Glib::wrap( GTK_CELL_LAYOUT( my_icon_view.gobj() ) );
>
>
> And the error was: "Glib::wrap_auto_interface(): The C++ instance
> (N3Gtk8IconViewE) does not dynamic_cast to the interface."
>
>
> On 11/17/2009 10:47 PM, Todor Todorov wrote:
> > Hello list,
> >
> > I encountered the following problem: Under Gtk+ it is possible to have a
> > GktIconView and cast it to a GtkCellLayout via the GTK_CELL_LAYOUT(obj)
> > macro. Then I could add a custom cell renderer and set attributes to it.
> >
> > Now I have implemented my cell renderer in C++/Gtkmm and would like to
> > add it to my Gtk::IconView. And since the class does not provide a
> > pack_start() functionality like TreeView, I would have to go and find my
> > own way to do it...
> >
> > The first problem is that the IconView class does not inherit (in the
> > traditional C++ way) from Gtk::CellLayout. Second, the
> > reinterpret_cast<> did not work either. There is no function in the
> > Gtk::IconView API that lets me convert to a CellLayout, or in the
> > Gtk::CellLayout API to create it from an IconView... Third, I tried to
> > do something like
> >
> > Gtk::CellLayout *cl = Glib::wrap( GTK_CELL_LAYOUT( my_icon_view.gobj() ) );
> > cl->pack_start( renderer, false );
> > cl->add_attribute( renderer->property_blah(), columns.blah );
> > ....
> >
> > While it compiles, the application crashed with a reinterpret_cast
> > failure reported. The only thing that worked so far was to take my Gtk+
> > implementation of the renderer, add it to my project and create a
> > GtkIconView, cast it to GTK_CELL_LAYOUT, add the renderer with
> > properties, and at the end wrap it into a Gtk::IconView and work from
> > there as it were pure Gtkmm.
> >
> > I wonder though, is this the best way? I would like to not handle Gtk+
> > objects directly in my code. Can anyone make a suggestion as to how to
> > add a custom cell renderer to a Gtk::IconView in a "best practice"
> > approach? Your help and time are greatly appreciated.

The problem is that Gtk::IconView does not implement the Gtk::CellLayout
interface because the change was done in Gtk+ at a time when gtkmm could
not break ABI (I think searching on the list will provide more info).
For now you're probably doing it the right way until the change can be
made to gtkmm.

--
José

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How to add a custom cell renderer to a Gtk::IconView?

2009-11-19T20:35:52Z

Hello list,

I apologize for repeating myself, but after a couple of days of trial
and errors - mostly errors - I am at my wits' end.

Could anyone give an example ( or point me to an application ) on how to
add a custom Gtk::CellRenderer to a Gtk::IconView? I looked on my own
but did not find any pointers. It would be preferable, if the cell
renderer is implemented in Gtkmm, so it supports sigc signals and slots...

Thanks in advance.

Kind regards,

Todor
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