[baobab] Add Keyboard Shortcuts help window

[Stefano Facchini <sfacchini src gnome org>]

commit 72e49eef45ce776260b98cdb7f17c47527fb0422
Author: Stefano Facchini <stefano facchini gmail com>
Date:   Sun Oct 14 14:52:33 2018 +0200

    Add Keyboard Shortcuts help window

 src/baobab-main-window.ui |  4 ++++
 src/baobab.gresource.xml  |  1 +
 src/help-overlay.ui       | 54 +++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 59 insertions(+)
---
diff --git a/src/baobab-main-window.ui b/src/baobab-main-window.ui
index 41d12db..611c4d5 100644
--- a/src/baobab-main-window.ui
+++ b/src/baobab-main-window.ui
@@ -9,6 +9,10 @@
       </item>
     </section>
     <section>
+      <item>
+        <attribute name="label" translatable="yes">Keyboard _Shortcuts</attribute>
+        <attribute name="action">win.show-help-overlay</attribute>
+      </item>
       <item>
         <attribute name="label" translatable="yes">_Help</attribute>
         <attribute name="action">win.help</attribute>
diff --git a/src/baobab.gresource.xml b/src/baobab.gresource.xml
index 7cd35b0..889e9b1 100644
--- a/src/baobab.gresource.xml
+++ b/src/baobab.gresource.xml
@@ -6,6 +6,7 @@
     <file compressed="true">baobab-main-window.ui</file>
   </gresource>
   <gresource prefix="/org/gnome/baobab/gtk">
+    <file compressed="true">help-overlay.ui</file>
     <file compressed="true">menus.ui</file>
   </gresource>
   <gresource prefix="/org/gnome/baobab">
diff --git a/src/help-overlay.ui b/src/help-overlay.ui
new file mode 100644
index 0000000..0c76460
--- /dev/null
+++ b/src/help-overlay.ui
@@ -0,0 +1,54 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<interface>
+  <object class="GtkShortcutsWindow" id="help_overlay">
+    <property name="modal">true</property>
+    <child>
+      <object class="GtkShortcutsSection">
+        <property name="visible">true</property>
+        <property name="section-name">shortcuts</property>
+        <property name="max-height">10</property>
+        <child>
+          <object class="GtkShortcutsGroup">
+            <property name="visible">true</property>
+            <property name="title" translatable="yes" context="shortcut window">General</property>
+            <child>
+              <object class="GtkShortcutsShortcut">
+                <property name="visible">true</property>
+                <property name="accelerator">F10</property>
+                <property name="title" translatable="yes" context="shortcut window">Show / Hide primary 
menu</property>
+              </object>
+            </child>
+            <child>
+              <object class="GtkShortcutsShortcut">
+                <property name="visible">true</property>
+                <property name="accelerator">&lt;Primary&gt;r</property>
+                <property name="title" translatable="yes" context="shortcut window">Rescan current 
location</property>
+              </object>
+            </child>
+            <child>
+              <object class="GtkShortcutsShortcut">
+                <property name="visible">true</property>
+                <property name="accelerator">&lt;Primary&gt;o</property>
+                <property name="title" translatable="yes" context="shortcut window">Scan folder</property>
+              </object>
+            </child>
+            <child>
+              <object class="GtkShortcutsShortcut">
+                <property name="visible">true</property>
+                <property name="title" translatable="yes" context="shortcut window">Show Keyboard 
Shortcuts</property>
+                <property name="accelerator">&lt;ctrl&gt;&lt;shift&gt;question</property>
+              </object>
+            </child>
+            <child>
+              <object class="GtkShortcutsShortcut">
+                <property name="visible">true</property>
+                <property name="title" translatable="yes" context="shortcut window">Quit</property>
+                <property name="accelerator">&lt;Primary&gt;q</property>
+              </object>
+            </child>
+          </object>
+        </child>
+      </object>
+    </child>
+  </object>
+</interface>