Keybindings for individual letter keys (not modifier-combinations) on a GtkTextView widget (Gtk3 and PyGI)
- by monotasker
I've been able to set several keybord shortcuts for a GtkTextView and a GtkTextEntry using the new css provider system. I'm finding, though, that I only seem to be able to establish keybindings for combinations including a modifier key. The widget doesn't respond to any bindings I set up that use:
the delete key
the escape key
individual letter or punctuation keys alone
Here's the code where I set up the css provider for the keybindings:
#set up style context
keys = Gtk.CssProvider()
keys.load_from_path(os.path.join(data_path, 'keybindings.css'))
#set up style contexts and css providers
widgets = {'window': self.window, 'vbox': self.vbox,
'toolbar': self.toolbar, 'search_entry': self.search_entry,
'paned': self.paned,
'notelist_treeview': self.notelist_treeview,
'notelist_window': self.notelist_window,
'notetext_window': self.notetext_window,
'editor': self.editor,
'statusbar': self.statusbar
}
for l, w in widgets.iteritems():
w.get_style_context().add_provider(keys,
Gtk.STYLE_PROVIDER_PRIORITY_USER)
Then in keybindings.css this is an example of what works:
@binding-set gtk-vi-text-view
{
bind "<ctrl>b" { "move-cursor" (display-lines, -5, 0) }; /* 5 lines up */
bind "<ctrl>k" { "move-cursor" (display-lines, -1, 0) }; /* down */
bind "<ctrl>j" { "move-cursor" (display-lines, 1, 0) }; /* up */
}
Part of what I'm trying to do is just add proper delete-key function to the text widgets (right now the delete key does nothing at all). So if I add a binding like one of these, nothing happens:
bind "Delete" { "delete-selection" () };
bind "Delete" { "delete-from-cursor" (chars, 1) };
The other part of what I want to do is more elaborate. I want to set up something like Vim's command and visual modes. So at the moment I'm just playing around with (a) setting the widget to editable=false by hitting the esc key; and (b) using homerow letters to move the cursor (as a proof-of-concept exercise). So far there's no response from the escape key or from the letter keys, even though the bindings work when I apply them to modifier-key combinations.
For example, I do this in the css for the text-widget:
bind "j" { "move-cursor" (display-lines, 1, 0) }; /* down */
bind "k" { "move-cursor" (display-lines, -1, 0) }; /* up */
bind "l" { "move-cursor" (logical-positions, 1, 0) }; /* right */
bind "h" { "move-cursor" (logical-positions, -1, 0) }; /* left */
but none of these bindings does anything, even if other bindings in the same set are respected.
What's especially odd is that the vim-like movement bindings above are respected when I attach them to a GtkTreeView widget for navigating the tree-view options:
@binding-set gtk-vi-tree-view {
bind "j" { "move-cursor" (display-lines, 1) }; /* selection down */
bind "k" { "move-cursor" (display-lines, -1) }; /* selection up */ }
So it seems like there are limitations or overrides of some kind on keybindings for the TextView widget (and for the del key?), but I can't find documentation of anything like that. Are these just things that can't be done with the css providers? If so, what are my alternatives for non-modified keybindings?
Thanks.
