Re: [PyGObject] TreeView: Empty integer field or right aligned string

[c.buhtz]

On 2018-05-08 14:20 Luca Bacci  wrote:
>- Use Cell Data Func for ultimate flexibility

That is the signature
 Gtk.TreeCellDataFunc(tree_column, cell, tree_model, iter, data)

But how do I know which cell (row and column) is affected?
I can extrat the row with tree_model[iter] but not the column.

"tree_column" is of type Gtk.TreeViewColumn but doesn't even know its
position (first, second, ... column). There is no integer indicating
that.
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Re: Why would I see g_object_new_with_properties: assertion 'G_TYPE_IS_OBJECT (object_type)' failed?

[Brendan Long]

In case anyone else finds this in a Google search in the future, this was an 
interaction between Vala and libpeas. If you annotate a function with 
[ModuleInit] like we do here: 
https://github.com/jangernert/FeedReader/blob/master/plugins/backend/feedbin/feedbinInterface.vala#L750
 
,
 then link it into a library, the Vala compiler magically turns the entire 
library into a libpeas module. Since I was directly linking the module, the 
peas_register_types function wasn't being called and the types didn't exist.

I couldn't figure out how to call that function manually, so we just don't link 
that peas_register_types function 

 in our tests. Long term we'll probably just have a file with nothing but that 
function so we can test everything else easily.

> On Apr 22, 2018, at 12:56 PM, Brendan Long  wrote:
> 
> I'm not sure if this is a Glib, Meson or Vala thing, but I don't even 
> understand why this glib error would ever happen so I hope this is the right 
> place to ask (I know it means "this type is null", but I have no idea why 
> that would ever be the case).
> 
> I'm trying to convert a Vala project that uses dynamically loaded plugins to 
> Meson:
> 
> https://github.com/jangernert/FeedReader/pull/662 
> 
> 
> For some reason, linking a test exectable with one of our plugins causes 
> errors like:
> 
> $ ./plugins/backend/feedbin/test_feedbin
> /feedbinapi/construct: 
> (./plugins/backend/feedbin/test_feedbin:27002): GLib-GObject-CRITICAL **: 
> g_object_new_with_properties: assertion 'G_TYPE_IS_OBJECT (object_type)' 
> failed
> Trace/breakpoint trap (core dumped)
> 
> The file is just a simple class that extends GLib.object: 
> https://github.com/brendanlong/FeedReader/blob/meson/plugins/backend/feedbin/feedbinAPI.vala
>  
> 
> The meson build is here, if that matters: 
> https://github.com/brendanlong/FeedReader/blob/meson/plugins/backend/feedbin/meson.build
>  
> 
> 
> We were getting similar issues when linking our main library statically, but 
> it's a shared library now (and the plugin has always been a shared library).
> 
> The only things I could find on Google were versioning issues, but I get this 
> error in Docker, where no other version of FeedReader is installed:
> 
> https://circleci.com/gh/brendanlong/FeedReader/206 
> 
> 
> Can someone help me understand what's going wrong, and what I might do to fix 
> it? 
> 

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Re: [PyGObject] TreeView: Empty integer field or right aligned string

[Luca Bacci]

To have empty int cells, you can either

   - use strings, instead of ints, in ListStore as you said
   - make place for a third value in ListStore, of type bool, and control
   the "visible" property of the first Cell Renderer with it (see code below)
   - Use Cell Data Func for ultimate flexibility

And here's the code

import gi
gi.require_version('Gtk', '3.0')
from gi.repository import Gtk

class TreeView(Gtk.TreeView):
def __init__(self, model):
Gtk.TreeView.__init__(self, model)
col_a = Gtk.TreeViewColumn('int',
   Gtk.CellRendererText(),
   text=0,
   visible=2)
self.append_column(col_a)
col_b = Gtk.TreeViewColumn('str',
   Gtk.CellRendererText(),
   text=1)
self.append_column(col_b)


class TreeModel(Gtk.ListStore):
def __init__(self):
Gtk.ListStore.__init__(self, int, str, bool)

self.append([1, '111', True])
self.append([0, 'Hi!', False])
self.append([3, '3',   True])


class Window(Gtk.Window):
def __init__(self):
Gtk.Window.__init__(self, title='Mein Gtk-Fenster')
self.set_default_size(400, 300)

self.model = TreeModel()
self.view = TreeView(self.model)

# layout
self.layout = Gtk.Grid()
self.add(self.layout)
self.layout.attach(self.view, 0, 1, 1, 1)

self.connect('destroy', Gtk.main_quit)
self.show_all()

if __name__ == '__main__':
win = Window()
Gtk.main()

Luca

2018-05-08 12:08 GMT+02:00 Luca Bacci :

> Hello!
>
> You can achieve what you want with the "xalign" property of CellRenderers
>
> col_b = Gtk.TreeViewColumn('str',
>Gtk.CellRendererText(xalign=1),
>text=1)
>
> xalign takes a value between 0 and 1.
> xalign=0 -> left-justified
> xalign=1 -> right-justified
>
> Luca
>
>
> 2018-05-06 12:01 GMT+02:00 :
>
>> X-Post: https://stackoverflow.com/q/50194505/4865723
>>
>> I want to have in a Gtk.TreeView
>>
>> - empty cells in a "int row" of a TreeView
>> - or (as a workaround) a right aligned "string row"
>>
>> There is a screenshot and example code in the StackOverflow question
>> linked in the first line of this post.
>>
>> The problem is
>>
>> - When I give 'None' to a 'int row' a '0' is displayed. I would
>>   expect an empty cell. I want that cell to be
>>   absolute empty.
>>
>> - A workaround is to use strings instead of int and just display the
>>   numbers as strings doing str(int).
>>   But then the content of each cell is left aligned by default.
>>   I tried to modify that. But this also has no effect.
>>
>> I attached the full example.
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>> https://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
>>
>
>
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Re: [PyGObject] TreeView: Empty integer field or right aligned string

[Luca Bacci]

Hello!

You can achieve what you want with the "xalign" property of CellRenderers

col_b = Gtk.TreeViewColumn('str',
   Gtk.CellRendererText(xalign=1),
   text=1)

xalign takes a value between 0 and 1.
xalign=0 -> left-justified
xalign=1 -> right-justified

Luca


2018-05-06 12:01 GMT+02:00 :

> X-Post: https://stackoverflow.com/q/50194505/4865723
>
> I want to have in a Gtk.TreeView
>
> - empty cells in a "int row" of a TreeView
> - or (as a workaround) a right aligned "string row"
>
> There is a screenshot and example code in the StackOverflow question
> linked in the first line of this post.
>
> The problem is
>
> - When I give 'None' to a 'int row' a '0' is displayed. I would
>   expect an empty cell. I want that cell to be
>   absolute empty.
>
> - A workaround is to use strings instead of int and just display the
>   numbers as strings doing str(int).
>   But then the content of each cell is left aligned by default.
>   I tried to modify that. But this also has no effect.
>
> I attached the full example.
> ___
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> gtk-app-devel-list@gnome.org
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>
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Re: Is it possible to catch ALT+TAB and do nothing

[Carsten Mattner]

It sounds like you have a kiosk application that is using a
terminal emulator, maybe xterm specifically for complete VT
compatibility, and has no other interactive application.

If that's the case and X proves hard to make work, I can suggest
running a terminal emulator like the new generation of kmscon
whose name I don't remember or Enlightenment's Terminology, as
both run on top of KMS/DRM. No need for a display manager. If
you combine it with a terminal locker, it should provide the
solution you're looking for.

If, however, you run more than xterm and need to spawn a few
X apps now and then, this wont' work. Terminology is quite
capable and might replace any image/video viewing needs you
maybe have.
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Re: Is it possible to catch ALT+TAB and do nothing

[Gergely Polonkai]

Given your earlier mails, the thing you want to achieve is near to
impossible. Even if you donʼt give focus to every terminal app that can
ever exist, I can press Ctrl-Alt-F2 to go to the textual console and do
whatever Iʼd like. If there is one thing in the X world you canʼt catch is
this (and maybe Ctrl-Alt-Backspace). Of course, you can disable those in
the X config. If a regular user can install software on the machine, you
stand no chance; even without root access it is possible.

If you donʼt want the user to interact with the computer at a specific
time, why not firing up the password protected screen saver?

On Tue, May 8, 2018, 00:46 James Cameron  wrote:

> On Mon, May 07, 2018 at 05:03:40PM -0500, Igor Korot wrote:
> > James,
> >
> > On Mon, May 7, 2018 at 4:46 PM, James Cameron  wrote:
> > > On Mon, May 07, 2018 at 04:27:57PM -0500, Igor Korot wrote:
> > >> Paul et al,
> > >> Any idea how to configure FVWM to not to give focus to xterm if one
> > >> specific window is displayed?
> > >
> > > You might ask on an fvwm mailing list, but fvwm does have a
> > > NeverFocus method that can be applied to an application such as xterm.
> >
> > Yes, just subscribed to their forum and will ask that question.
> > >
> > > http://www.fvwm.org/documentation/manpages/fvwm.html
> > >
> > > But that would just fix your problem for xterm; to enforce focus for a
> > > lock screen, there's more to do.  Have a look at the code for other
> > > lock screens to find out what that is.
> >
> > We do not provide any external application where the user can interact
> > with the keyboard/focus handling
> > in order to try and guess the information that should be secured.
> > Only the xterm is a concern.
>
> If this is an embedded system or kiosk application, replace xterm with
> something of your own making that uses libvte as a widget.  That way
> you can assert full control over when the widget is visible.
>
> I've found VTE acceptable for most use cases I've thrown at it.
>
> Though I still use xterm when I can.
>
> > [...]
>
> --
> James Cameron
> http://quozl.netrek.org/
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