Imported Upstream version 0.2+gitdfdad95upstream/0.2+gitdfdad95

1 files changed, 196 insertions, 0 deletions

diff --git a/src/utilities/bindingManager.vala b/src/utilities/bindingManager.vala
new file mode 100644
index 0000000..8795124
--- /dev/null
+++ b/src/utilities/bindingManager.vala
@@ -0,0 +1,196 @@
+/*
+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;
+    }
+}
+
+}