[gnome-control-center] shell: Add a help overlay

[Matthias Clasen <matthiasc src gnome org>]

commit fde96cc69104ecbe45add676442b27949b3a96a6
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Dec 10 20:49:59 2015 -0500

    shell: Add a help overlay
    
    This explains the various keyboard shortcuts that are available
    in the control-center.
    
    See https://wiki.gnome.org/Initiatives/GnomeGoals/ShortcutWindows
    
    https://bugzilla.gnome.org/show_bug.cgi?id=759320

 shell/Makefile.am                        |    9 ++++
 shell/cc-application.c                   |    1 +
 shell/gnome-control-center.gresource.xml |    6 +++
 shell/help-overlay.ui                    |   61 ++++++++++++++++++++++++++++++
 4 files changed, 77 insertions(+), 0 deletions(-)
---
diff --git a/shell/Makefile.am b/shell/Makefile.am
index f72ebe9..e9cac8b 100644
--- a/shell/Makefile.am
+++ b/shell/Makefile.am
@@ -109,10 +109,19 @@ completion_DATA = $(completion_in_files:.in=)
 completions/gnome-control-center: completions/gnome-control-center.in list-panel.sh
        $(AM_V_GEN) mkdir -p `dirname $ ` && cat $< | sed "s,@PANELS@,`$(srcdir)/list-panel.sh 
$(top_srcdir)`," > $@
 
+resource_files = $(shell glib-compile-resources --generate-dependencies --sourcedir=$(srcdir) 
gnome-control-center.gresource.xml)
+resources.c: gnome-control-center.gresource.xml $(resource_files)
+       $(AM_V_GEN) glib-compile-resources --target=$@ --sourcedir=$(srcdir) --generate-source $<
+
+BUILT_SOURCES = resources.c
+
 EXTRA_DIST =                                   \
        gnome-control-center.desktop.in.in      \
        $(servicefile_in_files)                 \
        $(completion_in_files)                  \
+       gnome-control-center.gresource.xml      \
+       help-overlay.ui                         \
+       $(resource_files)                       \
        list-panel.sh
 
 CLEANFILES = $(BUILT_SOURCES) $(completion_DATA) $(servicefile_DATA)
diff --git a/shell/cc-application.c b/shell/cc-application.c
index 1b6b9f8..c160899 100644
--- a/shell/cc-application.c
+++ b/shell/cc-application.c
@@ -248,6 +248,7 @@ cc_application_startup (GApplication *application)
   menu = g_menu_new ();
 
   section = g_menu_new ();
+  g_menu_append (section, _("Keyboard Shortcuts"), "win.show-help-overlay");
   g_menu_append (section, _("Help"), "app.help");
   g_menu_append (section, _("Quit"), "app.quit");
 
diff --git a/shell/gnome-control-center.gresource.xml b/shell/gnome-control-center.gresource.xml
new file mode 100644
index 0000000..050f803
--- /dev/null
+++ b/shell/gnome-control-center.gresource.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<gresources>
+  <gresource prefix="/org/gnome/ControlCenter/gtk">
+    <file preprocess="xml-stripblanks">help-overlay.ui</file>
+  </gresource>
+</gresources>
diff --git a/shell/help-overlay.ui b/shell/help-overlay.ui
new file mode 100644
index 0000000..e72d5f1
--- /dev/null
+++ b/shell/help-overlay.ui
@@ -0,0 +1,61 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<interface>
+  <!-- interface-requires gtk+ 3.17 -->
+
+  <object class="GtkShortcutsWindow" id="help_overlay">
+    <property name="modal">1</property>
+    <child>
+      <object class="GtkShortcutsSection">
+        <property name="visible">1</property>
+        <property name="section-name">shortcuts</property>
+        <property name="max-height">10</property>
+        <child>
+          <object class="GtkShortcutsGroup">
+            <property name="visible">1</property>
+            <property name="title" translatable="yes">General</property>
+            <child>
+              <object class="GtkShortcutsShortcut">
+                <property name="visible">1</property>
+                <property name="accelerator">&lt;ctrl&gt;Q</property>
+                <property name="title" translatable="yes">Quit</property>
+              </object>
+            </child>
+            <child>
+              <object class="GtkShortcutsShortcut">
+                <property name="visible">1</property>
+                <property name="accelerator">&lt;ctrl&gt;S</property>
+                <property name="title" translatable="yes">Search</property>
+              </object>
+            </child>
+          </object>
+        </child>
+        <child>
+          <object class="GtkShortcutsGroup">
+            <property name="visible">1</property>
+            <property name="title" translatable="yes">Panels</property>
+            <child>
+              <object class="GtkShortcutsShortcut">
+                <property name="visible">1</property>
+                <property name="accelerator">&lt;Alt&gt;Left</property>
+                <property name="title" translatable="yes">Go back to the overview</property>
+              </object>
+            </child>
+          </object>
+        </child>
+        <child>
+          <object class="GtkShortcutsGroup">
+            <property name="visible">1</property>
+            <property name="title" translatable="yes">Search</property>
+            <child>
+              <object class="GtkShortcutsShortcut">
+                <property name="visible">1</property>
+                <property name="accelerator">Escape</property>
+                <property name="title" translatable="yes">Cancel search</property>
+              </object>
+            </child>
+          </object>
+        </child>
+      </object>
+    </child>
+  </object>
+</interface>