Re: Editable SpinButton on a TreeView: detect *every* changes

[Tristan Van Berkom]

Hi,

On Tue, 2016-11-15 at 02:09 +0100, pozzugno wrote:
[...]
> I have tried to catch "editing_started", "editing_canceled" and
> "edited" 
> signals of CellRenderer. In "editing_started" callback, I retrieve
> and 
> save the row and column of the cell the user is going to edit. I
> also 
> connect a callback to "value_changed" signal of the GtkAdjustment 
> associated to the GtkCellRendererSpin. Moreover I save the starting 
> value so I can restore it if the user will cancel the editing.
> 
> When the user clicks on +/- buttons, "value_changed" is called (so I
> can 
> send the request to the remote device).
> 
> With some tricks, I'm able to restore the original value if the user 
> cancels the editing and to avoid a duplicate request to the remote 
> device when the user confirm the value changed by +/- buttons
> (actually 
> when the user moves the focus away from the spinbutton, thus
> terminated 
> the editing).
> 
> As you know, I'm very new to Gtk programming, so I'm wondering
> wethere 
> there's a better approach.

Without reading your python code, your approach sounds correct.

If you want to get notifications (callbacks) for live editing of
editable widgets, you need to handle the editing started signal and
then handle signals on the editable widget which is created for that
edit session.

Cheers,
    -Tristan

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Re: Editable SpinButton on a TreeView: detect *every* changes

[pozzugno]

Il 14/11/2016 18:19, Pozz Pozz ha scritto:
I created with success a TreeView based on a ListStore. One column has 
a SpinButton (actually a GtkCellRendererSpin).


Now I want to detect when the user *is* changing the value, i.e. every 
time he clicks on + or - buttons.


If I connect the "edited" signal, my callack will be called only when 
the spin button is "unfocused". I lost every clicks.



I have tried to catch "editing_started", "editing_canceled" and "edited" 
signals of CellRenderer. In "editing_started" callback, I retrieve and 
save the row and column of the cell the user is going to edit. I also 
connect a callback to "value_changed" signal of the GtkAdjustment 
associated to the GtkCellRendererSpin. Moreover I save the starting 
value so I can restore it if the user will cancel the editing.


When the user clicks on +/- buttons, "value_changed" is called (so I can 
send the request to the remote device).


With some tricks, I'm able to restore the original value if the user 
cancels the editing and to avoid a duplicate request to the remote 
device when the user confirm the value changed by +/- buttons (actually 
when the user moves the focus away from the spinbutton, thus terminated 
the editing).


As you know, I'm very new to Gtk programming, so I'm wondering wethere 
there's a better approach.


Here it is my code in Python:

def on_cellspin_table_editing_started(self, renderer, editable, path):
print("editing_started")
self.index_of_table = int(path)
for column_idx, column in 
zip(range(len(self.tv_calib.get_columns())), self.tv_calib.get_columns()):

if column.get_cells()[0] is renderer:
self.table_column = column_idx
break
self.table_adj = editable.get_adjustment()
self.start_value = 
self.liststore[self.index_of_table][self.table_column]

self.table_editing = True
self.table_adj.connect("value-changed", self.on_adj_value_changed)

def on_cellspin_table_edited(self, renderer, path, new_text):
print("edited")
self.table_editing = False
self.table_adj.disconnect_by_func(self.on_adj_value_changed)
new_value = int(new_text)
if int(self.table_adj.get_value()) != new_value:
self.set_value(self.index_of_table, new_value)

def on_cellspin_table_editing_canceled(self, renderer):
print("editing_canceled")
self.table_editing = False
self.table_adj.disconnect_by_func(self.on_adj_value_changed)
if self.start_value != int(self.table_adj.get_value()):
self.set_value(self.index_of_table, self.table_column, 
self.start_value)


def on_adj_value_changed(self, adj):
print("value_changed")
self.set_value(self.index_of_table, self.table_column, 
int(adj.get_value()))


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Re: Sharing Gtk.Adjustment objects among several Gtk.SpinButton widgets

[Emmanuele Bassi]

Hi;

On 14 November 2016 at 17:12, Pozz Pozz  wrote:

>> A GtkAdjustment is a "model", whereas the widgets using the adjustment
>> are the "views". So, if you use the same GtkAdjustment instance, all
>> widgets will share the same underlying state. This is by design.
>>
>> If you want to create different widgets with the same adjustment
>> parameters but not sharing the same state you will have to create
>> different GtkAdjustment instances — plausibly using a factory method.
>>
>
> Thank you for your answer. My doubt was derived from the following
> statements [1]:
>
> "The GtkAdjustment object does not update the value itself. Instead
> it is left up to the
> owner of the GtkAdjustment to control the value."
>
> At first, I thought the value (actual state) was managed (and stored)
> directly by the widget, without
> changing the value of associated adjustment.
> From your words, that sentence says the widgets explicitly change the value
> of its adjustment, when needed.

Yes; in a broader sense, the widget using an adjustment is both the
view and the controller of the value.

All a widget does is calling gtk_adjustment_set_value() with the value
desired by the user — through direct manipulation of the UI element,
or programmatically. The adjustment will then notify the widget of the
change, and the widget will update itself to reflect it. This allows
multiple widgets to store and manipulate the adjustment. The value
itself is a property of the GtkAdjustment instance.

Ciao,
 Emmanuele.

-- 
https://www.bassi.io
[@] ebassi [@gmail.com]
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Editable SpinButton on a TreeView: detect *every* changes

[Pozz Pozz]

I created with success a TreeView based on a ListStore. One column has a
SpinButton (actually a GtkCellRendererSpin).

Now I want to detect when the user *is* changing the value, i.e. every time
he clicks on + or - buttons.

If I connect the "edited" signal, my callack will be called only when the
spin button is "unfocused". I lost every clicks.
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Re: Sharing Gtk.Adjustment objects among several Gtk.SpinButton widgets

[Pozz Pozz]

2016-11-14 16:39 GMT+01:00 Emmanuele Bassi :

> Hi;
>
> On 14 November 2016 at 15:36, Pozz Pozz  wrote:
> > Is it possible to have a single Gtk.Adjustment for several Gtk.SpinButton
> > widgets? I couldn't understand if the adjustment is only used by
> SpinButton
> > to know the range (and some additional details, such as the page size),
> or
> > the adjustment is used also for the value storage place.
> >
> > I tried to create two SpinButtons and to set a single adjustment, but it
> > seems to me changing the value of a SpinButton will change the value of
> the
> > other SpinButton too. So it seems it isn't possible to share one
> adjustment
> > among several widgets.
> >
> > Of course, I'm supponsing the case of several parameters that have
> > different values but the same range properties (min, max, page step, ...)
>
> A GtkAdjustment is a "model", whereas the widgets using the adjustment
> are the "views". So, if you use the same GtkAdjustment instance, all
> widgets will share the same underlying state. This is by design.
>
> If you want to create different widgets with the same adjustment
> parameters but not sharing the same state you will have to create
> different GtkAdjustment instances — plausibly using a factory method.
>

Thank you for your answer. My doubt was derived from the following
statements [1]:

"The GtkAdjustment object does not update the value itself. Instead
it is left up to the
owner of the GtkAdjustment to control the value."

At first, I thought the value (actual state) was managed (and stored)
directly by the widget, without
changing the value of associated adjustment.
From your words, that sentence says the widgets explicitly change the value
of its adjustment, when needed.


[1] https://developer.gnome.org/gtk3/stable/GtkAdjustment.html
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Re: Sharing Gtk.Adjustment objects among several Gtk.SpinButton widgets

[Emmanuele Bassi]

Hi;

On 14 November 2016 at 15:36, Pozz Pozz  wrote:
> Is it possible to have a single Gtk.Adjustment for several Gtk.SpinButton
> widgets? I couldn't understand if the adjustment is only used by SpinButton
> to know the range (and some additional details, such as the page size), or
> the adjustment is used also for the value storage place.
>
> I tried to create two SpinButtons and to set a single adjustment, but it
> seems to me changing the value of a SpinButton will change the value of the
> other SpinButton too. So it seems it isn't possible to share one adjustment
> among several widgets.
>
> Of course, I'm supponsing the case of several parameters that have
> different values but the same range properties (min, max, page step, ...)

A GtkAdjustment is a "model", whereas the widgets using the adjustment
are the "views". So, if you use the same GtkAdjustment instance, all
widgets will share the same underlying state. This is by design.

If you want to create different widgets with the same adjustment
parameters but not sharing the same state you will have to create
different GtkAdjustment instances — plausibly using a factory method.

Ciao,
 Emmanuele.

-- 
https://www.bassi.io
[@] ebassi [@gmail.com]
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Sharing Gtk.Adjustment objects among several Gtk.SpinButton widgets

[Pozz Pozz]

Is it possible to have a single Gtk.Adjustment for several Gtk.SpinButton
widgets? I couldn't understand if the adjustment is only used by SpinButton
to know the range (and some additional details, such as the page size), or
the adjustment is used also for the value storage place.

I tried to create two SpinButtons and to set a single adjustment, but it
seems to me changing the value of a SpinButton will change the value of the
other SpinButton too. So it seems it isn't possible to share one adjustment
among several widgets.

Of course, I'm supponsing the case of several parameters that have
different values but the same range properties (min, max, page step, ...)
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Re: GtkEntry placeholder in GTK2

[Colomban Wendling]

Hi,

Le 14/11/2016 à 14:30, Gabriele Greco a écrit :
> I know GTK 3.2+ has a nice gtk_entry_set_placeholder_text() method, but I'm
> wondering if there is some clever method to do something similar with GTK2,
> I've not found anything googling around, but placeholder texts are a so
> common interface concept today that I doubt that someone has not yet
> "emulated" it in gtk2...

I wrote something like that ages ago, you can find it there:
https://github.com/b4n/gvg/blob/master/src/gvg-entry.c

I haven't touched this for ages though, but IIRC it worked nicely.

Hope it helps,
Colomban
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GtkEntry placeholder in GTK2

[Gabriele Greco]

Hello,

I know GTK 3.2+ has a nice gtk_entry_set_placeholder_text() method, but I'm
wondering if there is some clever method to do something similar with GTK2,
I've not found anything googling around, but placeholder texts are a so
common interface concept today that I doubt that someone has not yet
"emulated" it in gtk2...

If no one has already done it, I think this could work:

- initialize the widget with placeholder text
- set a user data on the widget telling the text is placeholder
- set the color of the foreground text for this text widget to gray
- add a focus in event and a on change event on the widget
- if focus in and user data == placeholder, erase the text, save it in
another user data, remove the custom style from the gtkentry
- if on changed and result text empty reload the placeholder text and
switch the style
- if on changed and previous text was empty clear the placeholder text and
switch the style

I wonder if this can work... I can also build a subclass string with this
behaviour since I need this in a few different places :(

-- 
*Bye,*
* Gabry*
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glade and compiled resources

[iSage]

So, i know i can compile my resources and glade .ui file and load it using
builder.
However, i have a problem with icons.
Let's say a have a following structure:
/
window.ui
pixmaps/
 run-iso.png

And an button in .ui with icon_name = run-iso

Using gtk_icon_theme_add_resource_path i can tell where to look for my
custom icon, and it works.
But, how do i tell glade where to look for it?
interface-local-resource-path doesn't seem to work for themeable icons
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