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/*
Copyright (c) 2011 by Simon Schneegans
This program is free software: you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the Free
Software Foundation, either version 3 of the License, or (at your option)
any later version.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
more details.
You should have received a copy of the GNU General Public License along with
this program. If not, see <http://www.gnu.org/licenses/>.
*/
namespace GnomePie {
/////////////////////////////////////////////////////////////////////////
/// Globally binds key stroke to given ID's. When one of the bound
/// strokes is invoked, a signal with the according ID is emitted.
/////////////////////////////////////////////////////////////////////////
public class BindingManager : GLib.Object {
/////////////////////////////////////////////////////////////////////
/// Called when a stored binding is invoked. The according ID is
/// passed as argument.
/////////////////////////////////////////////////////////////////////
public signal void on_press(string id);
/////////////////////////////////////////////////////////////////////
/// A list storing bindings, which are invoked even if Gnome-Pie
/// doesn't have the current focus
/////////////////////////////////////////////////////////////////////
private Gee.List<Keybinding> bindings = new Gee.ArrayList<Keybinding>();
/////////////////////////////////////////////////////////////////////
/// Ignored modifier masks, used to grab all keys even if these locks
/// are active.
/////////////////////////////////////////////////////////////////////
private static uint[] lock_modifiers = {
0,
Gdk.ModifierType.MOD2_MASK,
Gdk.ModifierType.LOCK_MASK,
Gdk.ModifierType.MOD5_MASK,
Gdk.ModifierType.MOD2_MASK|Gdk.ModifierType.LOCK_MASK,
Gdk.ModifierType.MOD2_MASK|Gdk.ModifierType.MOD5_MASK,
Gdk.ModifierType.LOCK_MASK|Gdk.ModifierType.MOD5_MASK,
Gdk.ModifierType.MOD2_MASK|Gdk.ModifierType.LOCK_MASK|Gdk.ModifierType.MOD5_MASK
};
/////////////////////////////////////////////////////////////////////
/// Helper class to store keybinding
/////////////////////////////////////////////////////////////////////
private class Keybinding {
public Keybinding(string accelerator, int keycode, Gdk.ModifierType modifiers, string id) {
this.accelerator = accelerator;
this.keycode = keycode;
this.modifiers = modifiers;
this.id = id;
}
public string accelerator { get; set; }
public int keycode { get; set; }
public Gdk.ModifierType modifiers { get; set; }
public string id { get; set; }
}
/////////////////////////////////////////////////////////////////////
/// C'tor adds the event filter to the root window.
/////////////////////////////////////////////////////////////////////
public BindingManager() {
// init filter to retrieve X.Events
Gdk.Window rootwin = Gdk.get_default_root_window();
if(rootwin != null) {
rootwin.add_filter(event_filter);
}
}
/////////////////////////////////////////////////////////////////////
/// Binds the ID to the given accelerator.
/////////////////////////////////////////////////////////////////////
public void bind(string accelerator, string id) {
uint keysym;
Gdk.ModifierType modifiers;
Gtk.accelerator_parse(accelerator, out keysym, out modifiers);
if (keysym == 0) {
warning("Invalid keystroke: " + accelerator);
return;
}
Gdk.Window rootwin = Gdk.get_default_root_window();
X.Display display = Gdk.x11_drawable_get_xdisplay(rootwin);
X.ID xid = Gdk.x11_drawable_get_xid(rootwin);
int keycode = display.keysym_to_keycode(keysym);
if(keycode != 0) {
Gdk.error_trap_push();
foreach(uint lock_modifier in lock_modifiers) {
display.grab_key(keycode, modifiers|lock_modifier, xid, false, X.GrabMode.Async, X.GrabMode.Async);
}
Gdk.flush();
Keybinding binding = new Keybinding(accelerator, keycode, modifiers, id);
bindings.add(binding);
}
}
/////////////////////////////////////////////////////////////////////
/// Unbinds the accelerator of the given ID.
/////////////////////////////////////////////////////////////////////
public void unbind(string id) {
Gdk.Window rootwin = Gdk.get_default_root_window();
X.Display display = Gdk.x11_drawable_get_xdisplay(rootwin);
X.ID xid = Gdk.x11_drawable_get_xid(rootwin);
Gee.List<Keybinding> remove_bindings = new Gee.ArrayList<Keybinding>();
foreach(var binding in bindings) {
if(id == binding.id) {
foreach(uint lock_modifier in lock_modifiers) {
display.ungrab_key(binding.keycode, binding.modifiers, xid);
}
remove_bindings.add(binding);
}
}
bindings.remove_all(remove_bindings);
}
/////////////////////////////////////////////////////////////////////
/// Returns a human readable accelerator for the given ID.
/////////////////////////////////////////////////////////////////////
public string get_accelerator_label_of(string id) {
string accelerator = this.get_accelerator_of(id);
if (accelerator == "")
return _("Not bound");
uint key = 0;
Gdk.ModifierType mods;
Gtk.accelerator_parse(accelerator, out key, out mods);
return Gtk.accelerator_get_label(key, mods);
}
/////////////////////////////////////////////////////////////////////
/// Returns the accelerator to which the given ID is bound.
/////////////////////////////////////////////////////////////////////
public string get_accelerator_of(string id) {
foreach (var binding in bindings) {
if (binding.id == id) {
return binding.accelerator;
}
}
return "";
}
/////////////////////////////////////////////////////////////////////
/// Event filter method needed to fetch X.Events
/////////////////////////////////////////////////////////////////////
private Gdk.FilterReturn event_filter(Gdk.XEvent gdk_xevent, Gdk.Event gdk_event) {
Gdk.FilterReturn filter_return = Gdk.FilterReturn.CONTINUE;
void* pointer = &gdk_xevent;
X.Event* xevent = (X.Event*) pointer;
if(xevent->type == X.EventType.KeyPress) {
foreach(var binding in bindings) {
// remove NumLock, CapsLock and ScrollLock from key state
uint event_mods = xevent.xkey.state & ~ (lock_modifiers[7]);
if(xevent->xkey.keycode == binding.keycode && event_mods == binding.modifiers) {
on_press(binding.id);
}
}
}
return filter_return;
}
}
}
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