[Sugar-devel] How to make a GTK3 EventBox accept the focus?

[James Simmons]

Gonzalo,

The problem with that it I want the arrow keys to page through the images
only when the image has the focus.  There are other places in the Activity
where I don't want to interfere with the arrow keys.  For instance, you can
make annotations for a specific image.

I notice that GtkImage is a subclass of GtkWidget, so maybe that means that
I don't need the event box anymore.  Maybe the image itself can accept the
focus and receive the events.  The problem I have with that is that the old
GTK made Image extend Widget also, and as I remember it you couldn't get
events from an Image.  It was years ago.  Maybe I've been doing it wrong
the whole time.

James Simmons


On Wed, Feb 27, 2013 at 6:24 PM, Gonzalo Odiard <gonzalo at laptop.org> wrote:

> Can you catch the key-press-event in the activity class?
> I think other activities like Read or Terminal do this.
>
> Gonzalo
>
> On Wed, Feb 27, 2013 at 1:53 PM, James Simmons <nicestep at gmail.com> wrote:
>
>> Aneesh,
>>
>> I'm trying to incorporate your GTK3 update to View Slides and release the
>> result on ASLO.  The problem I'm still having is that I cannot page through
>> the images using the keyboard as I used to.  What I did in the past was to
>> nest the image control in an event box and make the event box able to
>> accept the focus.  Then the user clicks on the image with the mouse to set
>> the focus and at that point the event box receives key press events.
>>
>> When you upgraded View Slides to use GTK3 you removed the code to make
>> the event box focusable.  I have tried to replace the missing line of code
>> with what seems to be the GTK3 equivalent but it isn't working.  I've done
>> a lot of google searches trying to figure out the problem and I'm not
>> getting anywhere.  I cannot release View Slides as it is.  It really needs
>> to be able to navigate through the images with the keyboard to be usable.
>>
>> I'm hoping you might have some thoughts or maybe an idea of how to do the
>> keyboard paging a different way.
>>
>> James Simmons
>>
>>
>> On Mon, Feb 25, 2013 at 6:20 AM, Manuel Quiñones <manuq at laptop.org>wrote:
>>
>>> Hi James,
>>>
>>> 2013/2/24 James Simmons <nicestep at gmail.com>:
>>> > I was looking at the upgrade to GTK3 done for View Slides and it seems
>>> that
>>> > it no longer responds to the keyboard.  What I had done previously to
>>> get it
>>> > to do that was to put the image I was displaying in an event box.  I
>>> then
>>> > made the event box accept the focus like this:
>>> >
>>> > self.eventbox.set_events(gtk.gdk.KEY_PRESS_MASK |
>>> gtk.gdk.BUTTON_PRESS_MASK)
>>> > self.eventbox.set_flags(gtk.CAN_FOCUS)
>>> >
>>> > The Gtk3 port changed the code to this:
>>> >
>>> > self.eventbox.set_events(Gdk.EventMask.KEY_PRESS_MASK |
>>> > Gdk.EventMask.BUTTON_PRESS_MASK)
>>> >
>>> > There was no code to make it accept the focus.  I tried adding this:
>>> >
>>> > self.eventbox.set_can_focus(True)
>>> >
>>> > This does not prevent the Activity from running, but it doesn't make
>>> the
>>> > Event Box focusable either.
>>>
>>> Have you tried self.eventbox.grab_focus() ?
>>>
>>>
>>> http://developer.gnome.org/gtk3/stable/GtkWidget.html#gtk-widget-grab-focus
>>>
>>> --
>>> .. manuq ..
>>>
>>
>>
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>>
>>
>
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