Re: [Vala] The future of Vala

[Flavio Danesse]

I 'm spending all my applications python Vala , I would like to know the
current state of Vala . Maybe I can contribute in some way to its
continuity.

2016-09-09 18:50 GMT-03:00 rastersoft :

> Hi:
>
> I was hoping to see at least one answer to this, but now I'm really
> scared. I really love Vala, so the perspective of missing it is really
> horrible :(
>
>
> El 08/09/16 a las 19:34, Timm Bäder escribió:
> > Hey,
> >
> > this is probably just a mail for Jürg and maybe Luca, but if you have a
> > relevant opinion on the matter, that might be a fine reply as well.
> >
> > So, for quite a while the Vala project has seen very little activity.
> > The three people most involved (Jürg, Luca and Flo) are barely on IRC
> > and/or otherwise reachable which makes it hard to get an opinion or info
> > from them. On the other hand, some people are still doing a great job,
> > namely Rico with all the binding work, as well as Evan (I haven't kept
> > up with what Al is doing other than replying to bugzilla issues that
> > won't be fixed unless it's a binding issue).
> >
> > Lots of people are worried about how the project will stay alive (or
> > if), and quite a lot of projects are written in Vala (including one I
> > maintain) -- and people keep porting projects from C to Vala, mostly
> > hoping for more contributions, hoping the Vala's C#-like syntax scares
> > off less people.
> >
> > Now, we all know that Vala has enough bugs that need to get fixed, as
> > well as lots of potential for improvements (I'll just disregard all the
> > wishes for special syntax for fringe features on IRC, that's not what
> > I'm talking about). Some of them are easy to fix but even if the patches
> > are present in bugzilla and their author is willing to fix them after
> > a review, the review just never happens. This doesn't just cause those
> > bugs to stay unfixed, but those people will also never get accustomed
> > to the internals of valac and so they will never work on anything more
> > important than this simple fix.
> >
> > I have tried in the past to do exactly that and post some patches for
> > simple fixes to get an understanding of valac internals but it's quite
> > frankly huge and there's not a real high-level documentation one could
> > work with (apart from a few very old blog posts form Luca) and neither
> > working tools do debug it (I've once spent a few hours on fixing valag
> > but then gave up...).
> >
> >
> > So... what's the deal here? Is there any way forward one could look
> > into? Is it wip/transform? IIRC there was some dbus stuff broken here?
> > Are there any TODO items for cleaning up the compiler? Should we just
> > tell people to not use Vala in the first place (which would be better
> > for the in the long run)? All of these are fine, but the current
> > situation not so much.
> >
> >
> > Sincerely,
> > Timm
> > ___
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> > https://mail.gnome.org/mailman/listinfo/vala-list
> >
>
> --
> Nos leemos
>  RASTER(Linux user #228804)
> ras...@rastersoft.com  http://www.rastersoft.com
>
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[Vala] query

[Flavio Danesse]

As I do to get the permissions on a file?

I'm doing a code editor , I wonder if there is a library that allows to
obtain the classes, methods and functions declared in a file for several
different languages.
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[Vala] Question "Gtk.SourceFile.is_externally_modified()"

[Flavio Danesse]

According to the documentation of Gtk.SourceFile there is a function called
is_externally_modified but when trying to use it gives me error and says it
does not exist.
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[Vala] Query !!

[Flavio Danesse]

See if someone can help me with this :

The following example compiles fine , but to run it throws an error :

Rape segment (` core ' generated)

private unowned uint8[] array;

this.pixbuf = new Gdk.Pixbuf.from_file(path);

this.array = this.pixbuf.get_pixels();

Gdk.Pixbuf pix = new Gdk.Pixbuf.from_data(
this.array, Gdk.Colorspace.RGB, this.pixbuf.has_alpha,
this.pixbuf.bits_per_sample, this.pixbuf.width,
this.pixbuf.height, this.pixbuf.rowstride, null);
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Re: [Vala] How to change the widget color

[Flavio Danesse]

var screen = Gdk.Screen.get_default();
var css_provider = new Gtk.CssProvider();
string style_path = Estilo.css;
css_provider.load_from_path(style_path);
Gtk.StyleContext.add_provider_for_screen(
screen, css_provider,
Gtk.STYLE_PROVIDER_PRIORITY_USER);


If you want you can review the code of my player:
https://github.com/fdanesse/JAMediaSuite/tree/master/JAMedia/vala
Incidentally, I accept tips to improve it, I come from python so surely my
vala code can be substantially improved.

2015-03-11 16:08 GMT-03:00 Erick Pérez Castellanos eric...@gnome.org:

 Hi:

 You need to take into account that vala is only a kind-of preprocessor
 that converts Vala language into C, so using devhelp and Gtk+ [1]
 documentation works perfectly fine.

 You need to use GtkCssProvider to do this. gtk_widget_override family
 of functions are deprecated.

 1. Obtain your widget GtkStyleContext
 2. Attach a custom CSS class
 3. Load some CSS sinppets with the customization you want using
 GtkCssProvider API.

 Cheers

 [1]: https://developer.gnome.org/gtk3/stable
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[Vala] question

[Flavio Danesse]

*As is done in vala?*

scroll = self.get_parent()
notebook = scroll.get_parent()
paginas = notebook.get_n_pages()

for indice in range(paginas):
page = notebook.get_children()[indice]
if page == scroll:
pag = notebook.get_children()[indice]
label = notebook.get_tab_label(pag).get_children()[0]
label.set_text(nombre)
break
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Re: [Vala] I found a major bug

[Flavio Danesse]

Thank you very much for the very detailed responses are helpful.

Long time no do anything in C or Java, since I discovered python not write
in another language. vala seems excellent among other things because I can
run my python application to vala practically without changes.

Hence come my difficulties with these functions.

In python get_toplevel () always returns the main Gtk.Window of apicación.
Get the value of any property is made by GET_PROPERTY (property_name),
etc. . .

These details are important for code clarity for those who got to vala from
python.

2014-12-20 2:36 GMT-02:00 Evan Nemerson e...@coeus-group.com:

 On Sat, 2014-12-20 at 00:51 -0200, Flavio Danesse wrote:
  Another thing that does not work as expected is:
 
  this.get_toplevel ()
 
  This should return the main application window, or one Gtk.Window, but
  returns a Gtk.Widget

 Because that's what the C function does.  The documentation describes
 when the return value will *not* be a Gtk.Window.  See

 https://developer.gnome.org/gtk3/stable/GtkWidget.html#gtk-widget-get-toplevel

  2014-12-20 0:32 GMT-02:00 Flavio Danesse fdane...@gmail.com:
 
   I understand, but it is logical that a get back what is asked, things
 like
   that are not logical fol:
  
   error: invocation of void method not allowed as expression
   this.get_property(type);

 Not sure where you're getting that error from—trying to call
 GLib.Object.get_property like that here results in:

 error: 1 missing arguments for `void GLib.Object.get_property
 (string property_name, ref GLib.Value value)'

 As for why it returns void instead of GLib.Value, look at the C
 function:

 https://developer.gnome.org/gobject/stable/gobject-The-Base-Object-Type.html#g-object-get-property

  
   In the initial example:
   this.get_allocation()
   does not work, though:
   this.get_allocated_width()
   if it works.

 This is a more interesting example, but again it's a reflection of the C
 API:


 https://developer.gnome.org/gtk3/stable/GtkWidget.html#gtk-widget-get-allocation

 https://developer.gnome.org/gtk3/stable/GtkWidget.html#gtk-widget-get-allocated-width

 For this function it would actually be possible to alter the bindings to

 public Gtk.Allocation get_allocation ();

 Actually, these days it is generated like that by default, but we have a
 line in our metadata file to change it back to avoid breaking backwards
 compatibility.

 Also, we have to be careful changing out params to return values like
 that since in the future the C API may change to include a return value
 (which isn't an API break for the C API).  That happened recently in
 GtkSourceview and it broke several Vala programs.  See
 https://bugzilla.gnome.org/show_bug.cgi?id=738896



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[Vala] I found a major bug

[Flavio Danesse]

*Hi, I just wanted to comment that I found a major bug in gtk:*

error: invocation of void method not allowed as expression
Gdk.Rectangle rect = this.get_allocation();
 ^
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Re: [Vala] I found a major bug

[Flavio Danesse]

I understand, but it is logical that a get back what is asked, things like
that are not logical fol:

error: invocation of void method not allowed as expression
this.get_property(type);

In the initial example:
this.get_allocation()
does not work, though:
this.get_allocated_width()
if it works.

2014-12-19 14:01 GMT-02:00 Andre Masella an...@masella.name:

 Mmm, no you didn't. :-)

 Gdk.Allocation allocation;
 this.get_allocation(out allocation);

 This is admittedly more awkward and Gtk.Widget.get_allocation has the
 right type signature in C to return, but this binding works too.

 On 19 December 2014 at 10:27, Flavio Danesse fdane...@gmail.com wrote:

 *Hi, I just wanted to comment that I found a major bug in gtk:*

 error: invocation of void method not allowed as expression
 Gdk.Rectangle rect = this.get_allocation();
  ^
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Re: [Vala] I found a major bug

[Flavio Danesse]

Another thing that does not work as expected is:

this.get_toplevel ()

This should return the main application window, or one Gtk.Window, but
returns a Gtk.Widget

2014-12-20 0:32 GMT-02:00 Flavio Danesse fdane...@gmail.com:

 I understand, but it is logical that a get back what is asked, things like
 that are not logical fol:

 error: invocation of void method not allowed as expression
 this.get_property(type);

 In the initial example:
 this.get_allocation()
 does not work, though:
 this.get_allocated_width()
 if it works.

 2014-12-19 14:01 GMT-02:00 Andre Masella an...@masella.name:

 Mmm, no you didn't. :-)

 Gdk.Allocation allocation;
 this.get_allocation(out allocation);

 This is admittedly more awkward and Gtk.Widget.get_allocation has the
 right type signature in C to return, but this binding works too.

 On 19 December 2014 at 10:27, Flavio Danesse fdane...@gmail.com wrote:

 *Hi, I just wanted to comment that I found a major bug in gtk:*

 error: invocation of void method not allowed as expression
 Gdk.Rectangle rect = this.get_allocation();
  ^
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Re: [Vala] Is there any cool modern library to make a screen-based apps?

[Flavio Danesse]

http://references.valadoc.org/#!api=vte-2.90/Vte


2014-03-11 18:29 GMT-03:00 Александер Пономарёв shoot...@gmail.com:

 Hello,
 I'm looking for a tool to make reach terminal app (like mc). Does anybody
 know about some library to make it easy? Some kind of Gtk for terminal
 screens =)
 I'm trying to use ncurses, but:
 1. Vala doesn't have bindings of panels and forms (correct me if I wrong)
 and so on.
 2. ncurses has awfull support of utf-8.
 3. and of course I hope there is more cool and usefull library for vala
 than ncurses.

 Thanks for your'e time =)
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[Vala] This is a bug or part of my ignorance?

[Flavio Danesse]

int x = 0;
x += 1;
Violation segment (`core 'generated)

int x = 0;
x ++;
Violation segment (`core 'generated)

int x = 0;
x = x + 1;
Violation segment (`core 'generated)
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Re: [Vala] This is a bug or part of my ignorance?

[Flavio Danesse]

public static int main (string[] args) {
int x = 0;
int x++;
return 0;
}


2014-03-08 3:34 GMT-02:00 Nor Jaidi Tuah norjaidi.t...@ubd.edu.bn:

 On Sat, 2014-03-08 at 00:10 -0200, Flavio Danesse wrote:
  int x = 0;
  x += 1;
  Violation segment (`core 'generated)
 
  int x = 0;
  x ++;
  Violation segment (`core 'generated)
 
  int x = 0;
  x = x + 1;

 I don't think you will get useful answers
 unless you provide more context.

 Those statements by themselves are harmless.
 But if, say, they are executed within the
 context of an object that is already
 freed, then... boom, you get a core.


 Nice day
 Nor Jaidi Tuah




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Re: [Vala] This is a bug or part of my ignorance?

[Flavio Danesse]

public static int main (string[] args) {
int x = 0;
x++;
return 0;
}


2014-03-08 3:51 GMT-02:00 Flavio Danesse fdane...@gmail.com:

 public static int main (string[] args) {
 int x = 0;
 int x++;
 return 0;
 }


 2014-03-08 3:34 GMT-02:00 Nor Jaidi Tuah norjaidi.t...@ubd.edu.bn:

 On Sat, 2014-03-08 at 00:10 -0200, Flavio Danesse wrote:
  int x = 0;
  x += 1;
  Violation segment (`core 'generated)
 
  int x = 0;
  x ++;
  Violation segment (`core 'generated)
 
  int x = 0;
  x = x + 1;

 I don't think you will get useful answers
 unless you provide more context.

 Those statements by themselves are harmless.
 But if, say, they are executed within the
 context of an object that is already
 freed, then... boom, you get a core.


 Nice day
 Nor Jaidi Tuah




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Re: [Vala] question Gtk 3 + gstreamer 1.0

[Flavio Danesse]

Excellent, you're a genius, thank you very much.
He had tried to do this myself, but I could not write it correctly (in
python only needs: *GLib.idle_add (callback, parameters)* )


2014-03-05 21:53 GMT-02:00 Luca Bruno lethalma...@gmail.com:

 Gstreamer fires signals in a different thread than the gui mainloop. Use
 something like
 Idle.add (() = { this.image_button.set_from_stock(
 Gtk.Stock.MEDIA_PLAY, Gtk.IconSize.BUTTON);
   return false; });
 to run your code in the gui mainloop.


 On Thu, Mar 6, 2014 at 12:28 AM, Flavio Danesse fdane...@gmail.comwrote:

 *Hello, I'm back with questions on the list :) *


 In my application I have gtk3 interface and streamings player gstreamer
 1.0
 implemented separately.
 Both work correctly separately and jointly work correctly except in the
 following case:

 The player emits a signal when the bus changes state of reproduction, that
 is, when it comes into play mode, pause, stop, etc.. . .
 That signal is captured by the gtk interface to update the image of the
 play button - stop.

 *The problem is that when this happens, everything freezes gnome.*


 private void update_state(string state){

 if (state == playing){
 this.image_button.set_from_stock(
 Gtk.Stock.MEDIA_STOP, Gtk.IconSize.BUTTON);
 }
 else{
 this.image_button.set_from_stock(
 Gtk.Stock.MEDIA_PLAY, Gtk.IconSize.BUTTON);
 }
 }

 *I would clean the following warning in my application, but not how to do
 it:*



 /home/flavio/Documentos/JAMediaSuite/UbuntuRadio/vala/UbuntuRadio.vala.c:164:2:
 warning: 'gtk_window_set_opacity' is deprecated (declared at
 /usr/include/gtk-3.0/gtk/gtkwindow.h:142): Use 'gtk_widget_set_opacity'
 instead [-Wdeprecated-declarations]
   gtk_window_set_opacity ((GtkWindow*) self, 0.5);
   ^
 /home/flavio/Documentos/JAMediaSuite/UbuntuRadio/vala/UbuntuRadio.vala.c:
 In function 'main':

 /home/flavio/Documentos/JAMediaSuite/UbuntuRadio/vala/UbuntuRadio.vala.c:377:2:
 warning: 'g_type_init' is deprecated (declared at
 /usr/include/glib-2.0/gobject/gtype.h:669) [-Wdeprecated-declarations]
   g_type_init ();
   ^
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[Vala] question

[Flavio Danesse]

Hello, I'm starting to learn this language and basically I decided to
migrate one of my applications python + gtk + gstreamer and although I
already have a lot of ported code, I have some doubts that I can not solve.

One is as I import classes that are in external files to python style:

from my_file import my_class
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Re: [Vala] question

[Flavio Danesse]

Well, but there are several things I do not understand because I can not
find examples.

For example, namespaces not uses because I have not found any example of
use, explanations of the official website I have no clear and it does not
say as implemented in practice.

Regarding compiling with python is not required, so not much about it .
I found an example where a makefile gun and I rely on it, but do not
understand much either, so far I've only written the following:

*all: jamedia*

*jamedia : JAMedia.vala*
*valac - pkg gtk + -3.0 - pkg gstreamer -1.0 $  -o $ @*

How do I add other files .vala in the makefile?

If I have a directory structure with many files of code, as I do to compile
it?
And as I do in the code to refer to particular classes of certain files
within that structure where I can have files with the same name and classes
with the same name?

As I said before I am python programmer.
There are things that are very simple to do in python, there are both vala,

Some examples :

I have a class called MyClass ( Gtk.Frame ), from which instantiate objects
and pack it into a box, in python, if I box.get_children (), it returns the
type MyClass widgets, but widgets vala me back, so which I can not use my
implementation will MyClass.

Sorry for my ignorance, I'm just a few days ago vala programming in, I
really like, but there are still several things I do not understand.

Thank you for your attention and response.


2014-03-04 9:38 GMT-02:00 Luca Dionisi luca.dion...@gmail.com:

 I assume you are not using namespaces.
 I assume the external files that you talk about are source files of
 your application (as in not an already compiled library)
 In this case you should need to do... nothing.
 Just include all the source files during compilation.

 HTH. Go ahead with learning!


 On Tue, Mar 4, 2014 at 12:22 PM, Flavio Danesse fdane...@gmail.com
 wrote:
  Hello, I'm starting to learn this language and basically I decided to
  migrate one of my applications python + gtk + gstreamer and although I
  already have a lot of ported code, I have some doubts that I can not
 solve.
 
  One is as I import classes that are in external files to python style:
 
  from my_file import my_class
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Re: [Vala] question

[Flavio Danesse]

Yes, I've read the tutorial, I'm slowly reading and trying.
In fact my application is already running, but surely not the best code for
vala and many details are not working.

For example, as I express this python code in vala?:

 self.inplay.get_children items = ()

 for item in items:
 if item.tipo == Player:
 item.stop ()
 self.inplay.remove (item)
 item.destroy ()

This does not work:

 var items = this.inplay.get_children();

 foreach (var item in items) {
 if (item.tipo == Player) {
 item.player.stop ();
 this.inplay.remove (item);
 item.destroy ();
 }
 }


2014-03-04 14:13 GMT-02:00 Luca Dionisi luca.dion...@gmail.com:

 I suggest you not to spend time learning the Makefile syntax.
 As a beginner, try to compile the program yourself, is easier.
 You pass all the files to the valac command line.
 If you do not use namespaces your classes must have unique names.
 Did you already read the vala tutorial, at least the first part?
 https://wiki.gnome.org/Projects/Vala/Tutorial


 On Tue, Mar 4, 2014 at 5:00 PM, Flavio Danesse fdane...@gmail.com wrote:
  Well, but there are several things I do not understand because I can not
  find examples.
 
  For example, namespaces not uses because I have not found any example of
  use, explanations of the official website I have no clear and it does not
  say as implemented in practice.
 
  Regarding compiling with python is not required, so not much about it .
  I found an example where a makefile gun and I rely on it, but do not
  understand much either, so far I've only written the following:
 
  all: jamedia
 
  jamedia : JAMedia.vala
  valac - pkg gtk + -3.0 - pkg gstreamer -1.0 $  -o $ @
 
  How do I add other files .vala in the makefile?
 
  If I have a directory structure with many files of code, as I do to
 compile
  it?
  And as I do in the code to refer to particular classes of certain files
  within that structure where I can have files with the same name and
 classes
  with the same name?
 
  As I said before I am python programmer.
  There are things that are very simple to do in python, there are both
 vala,
 
  Some examples :
 
  I have a class called MyClass ( Gtk.Frame ), from which instantiate
 objects
  and pack it into a box, in python, if I box.get_children (), it returns
 the
  type MyClass widgets, but widgets vala me back, so which I can not use my
  implementation will MyClass.
 
  Sorry for my ignorance, I'm just a few days ago vala programming in, I
  really like, but there are still several things I do not understand.
 
  Thank you for your attention and response.
 
 
  2014-03-04 9:38 GMT-02:00 Luca Dionisi luca.dion...@gmail.com:
 
  I assume you are not using namespaces.
  I assume the external files that you talk about are source files of
  your application (as in not an already compiled library)
  In this case you should need to do... nothing.
  Just include all the source files during compilation.
 
  HTH. Go ahead with learning!
 
 
  On Tue, Mar 4, 2014 at 12:22 PM, Flavio Danesse fdane...@gmail.com
  wrote:
   Hello, I'm starting to learn this language and basically I decided to
   migrate one of my applications python + gtk + gstreamer and although I
   already have a lot of ported code, I have some doubts that I can not
   solve.
  
   One is as I import classes that are in external files to python style:
  
   from my_file import my_class
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