[gnome-maps] MainWindow: add keybindings for zoom-in/out

[Zeeshan Ali Khattak <zeeshanak src gnome org>]

commit db314d754186530450fcda23866321aa12363642
Author: Jonas Danielsson <jonas threetimestwo org>
Date:   Mon Jul 8 13:48:49 2013 +0200

    MainWindow: add keybindings for zoom-in/out
    
    https://bugzilla.gnome.org/show_bug.cgi?id=697701

 src/mainWindow.js |   18 ++++++++++++++++++
 1 files changed, 18 insertions(+), 0 deletions(-)
---
diff --git a/src/mainWindow.js b/src/mainWindow.js
index a8031ad..65b5f3f 100644
--- a/src/mainWindow.js
+++ b/src/mainWindow.js
@@ -100,6 +100,8 @@ const MainWindow = new Lang.Class({
                             this._onConfigureEvent.bind(this));
         this.window.connect('window-state-event',
                             this._onWindowStateEvent.bind(this));
+        this.window.connect('key-press-event',
+                            this._onKeyPressEvent.bind(this));
 
         this._searchEntry.connect('activate',
                                   this._onSearchActivate.bind(this));
@@ -201,6 +203,22 @@ const MainWindow = new Lang.Class({
         Application.settings.set_boolean('window-maximized', maximized);
     },
 
+    _onKeyPressEvent: function(widget, event) {
+        let state = event.get_state()[1];
+
+        if (state & Gdk.ModifierType.CONTROL_MASK) {
+            let keyval = event.get_keyval()[1];
+
+            if (keyval === Gdk.KEY_plus)
+                this.mapView.view.zoom_in();
+
+            if (keyval === Gdk.KEY_minus)
+                this.mapView.view.zoom_out();
+        }
+
+        return false;
+    },
+
     _onSearchActivate: function() {
         let string = this._searchEntry.get_text();