Added Keyboard Shortcuts window

Coalesce the small, yet disparate shortcut keys available to users
in a separate window.

https://gitlab.gnome.org/GNOME/cheese/issues/9

Makefile.am

@@ -194,6 +194,7 @@ noinst_resource_files = \
 	data/cheese-prefs.ui \
 	data/headerbar.ui \
 	data/menus.ui \
+	data/shortcuts.ui \
 	data/pixmaps/cheese-1.svg \
 	data/pixmaps/cheese-2.svg \
 	data/pixmaps/cheese-3.svg \

data/headerbar.ui

@@ -12,6 +12,10 @@
       </item>
     </section>
     <section>
+      <item>
+        <attribute name="label" translatable="yes">_Keyboard Shortcuts</attribute>
+        <attribute name="action">app.shortcuts</attribute>
+      </item>
       <item>
         <attribute name="accel">F1</attribute>
         <attribute name="label" translatable="yes">_Help</attribute>

data/org.gnome.Cheese.gresource.xml

@@ -5,6 +5,7 @@
         <file>cheese-viewport.json</file>
         <file preprocess="xml-stripblanks">cheese-main-window.ui</file>
         <file preprocess="xml-stripblanks">cheese-prefs.ui</file>
+        <file preprocess="xml-stripblanks">shortcuts.ui</file>
         <file preprocess="xml-stripblanks">headerbar.ui</file>
         <file>pixmaps/cheese-1.svg</file>
         <file>pixmaps/cheese-2.svg</file>

data/shortcuts.ui

@@ -0,0 +1,60 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<interface>
+  <object class="GtkShortcutsWindow" id="shortcuts-cheese">
+    <property name="modal">1</property>
+    <child>
+      <object class="GtkShortcutsSection">
+        <property name="visible">1</property>
+        <property name="section-name">shortcuts</property>
+        <property name="max-height">12</property>
+        <child>
+          <object class="GtkShortcutsGroup">
+	    <property name="title" translatable="yes">Overview</property>
+            <child>
+              <object class="GtkShortcutsShortcut">
+                <property name="accelerator">F11</property>
+                <property name="title" translatable="yes">Fullscreen on / off</property>
+              </object>
+            </child>
+            <child>
+              <object class="GtkShortcutsShortcut">
+                <property name="accelerator">&lt;ctrl&gt;Q</property>
+                <property name="title" translatable="yes">Quit the application</property>
+              </object>
+            </child>
+	  </object>
+	</child>
+	<child>
+        <object class="GtkShortcutsGroup">
+            <property name="visible">1</property>
+            <property name="title" translatable="yes">Thumbnails</property>
+            <child>
+              <object class="GtkShortcutsShortcut">
+                <property name="accelerator">&lt;ctrl&gt;O</property>
+                <property name="title" translatable="yes">Open</property>
+              </object>
+            </child> 
+            <child>
+	          <object class="GtkShortcutsShortcut">
+                <property name="accelerator">&lt;ctrl&gt;S</property>
+                <property name="title" translatable="yes">Save As</property>
+              </object>
+            </child>
+            <child>
+    	      <object class="GtkShortcutsShortcut">
+                <property name="accelerator">Delete</property>
+                <property name="title" translatable="yes">Move to Trash</property>
+              </object>
+            </child>
+            <child>
+    	      <object class="GtkShortcutsShortcut">
+                <property name="accelerator">&lt;Shift&gt;Delete</property>
+                <property name="title" translatable="yes">Delete</property>
+              </object>
+            </child>
+	  </object>
+	</child>
+      </object>
+    </child>
+  </object>
+</interface>

po/POTFILES.in

@@ -5,6 +5,7 @@
 [type: gettext/glade]data/cheese-prefs.ui
 [type: gettext/glade]data/headerbar.ui
 [type: gettext/glade]data/menus.ui
+[type: gettext/glade]data/shortcuts.ui
 data/org.gnome.Cheese.appdata.xml.in
 data/org.gnome.Cheese.desktop.in.in
 [type: gettext/gsettings]data/org.gnome.Cheese.gschema.xml

src/cheese-application.vala

@@ -36,6 +36,8 @@ public class Cheese.Application : Gtk.Application
     private Camera camera;
     private PreferencesDialog preferences_dialog;
 
+    private Gtk.ShortcutsWindow shortcuts_window;
+
     private const GLib.ActionEntry action_entries[] = {
         { "shoot", on_shoot },
         { "mode", on_action_radio, "s", "'photo'", on_mode_change },
@@ -44,6 +46,7 @@ public class Cheese.Application : Gtk.Application
         { "wide-mode", on_action_toggle, null, "false", on_wide_mode_change },
         { "effects", on_action_toggle, null, "false", on_effects_change },
         { "preferences", on_preferences },
+        { "shortcuts", on_shortcuts },
         { "help", on_help },
         { "about", on_about },
         { "quit", on_quit }
@@ -469,6 +472,34 @@ public class Cheese.Application : Gtk.Application
         preferences_dialog.show ();
     }
 
+    /**
+     * Show the keyboard shortcuts.
+     */
+    private void on_shortcuts ()
+    {
+        if (shortcuts_window == null)
+        {
+            var builder = new Gtk.Builder ();
+            try
+            {
+                builder.add_from_resource ("/org/gnome/Cheese/shortcuts.ui");
+            }
+            catch (Error e)
+            {
+                error ("Error loading shortcuts window UI: %s", e.message);
+            }
+
+            shortcuts_window = builder.get_object ("shortcuts-cheese") as Gtk.ShortcutsWindow;
+            shortcuts_window.close.connect ( (event) => { shortcuts_window = null; } );
+        }
+
+        if (get_active_window () != shortcuts_window.get_transient_for ())
+            shortcuts_window.set_transient_for (get_active_window ());
+
+        shortcuts_window.show_all ();
+        shortcuts_window.present ();
+    }
+
     /**
      * Show the Cheese help contents.
      */