[libhandy] demo: Demo HdyCarousel:allow-scroll-wheel

[Alexander Mikhaylenko <alexm src gnome org>]

commit 44bdccd03eec4028e77041be701faca33237aef6
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Wed Apr 28 16:18:10 2021 +0200

    demo: Demo HdyCarousel:allow-scroll-wheel

 examples/hdy-demo-window.ui | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
---
diff --git a/examples/hdy-demo-window.ui b/examples/hdy-demo-window.ui
index c9f544f5..db34c928 100644
--- a/examples/hdy-demo-window.ui
+++ b/examples/hdy-demo-window.ui
@@ -1002,6 +1002,7 @@ Try using it with a horizontally expanded clamp to make your search entry adapti
                     <child>
                       <object class="HdyCarousel" id="carousel">
                         <property name="visible">True</property>
+                        <property name="allow-scroll-wheel" bind-source="carousel_scroll_wheel" 
bind-property="active" bind-flags="sync-create|bidirectional"/>
                         <property name="allow-long-swipes" bind-source="carousel_long_swipes" 
bind-property="active" bind-flags="sync-create|bidirectional"/>
                         <child>
                           <object class="HdyStatusPage">
@@ -1046,6 +1047,20 @@ Try using it with a horizontally expanded clamp to make your search entry adapti
                                     <signal name="notify::selected-index" 
handler="notify_carousel_indicators_cb" swapped="no"/>
                                   </object>
                                 </child>
+                                <child>
+                                  <object class="HdyActionRow">
+                                    <property name="visible">True</property>
+                                    <property name="title" translatable="yes">Scroll wheel</property>
+                                    <property name="activatable_widget">carousel_scroll_wheel</property>
+                                    <child>
+                                      <object class="GtkSwitch" id="carousel_scroll_wheel">
+                                        <property name="visible">True</property>
+                                        <property name="valign">center</property>
+                                        <property name="active">True</property>
+                                      </object>
+                                    </child>
+                                  </object>
+                                </child>
                                 <child>
                                   <object class="HdyActionRow">
                                     <property name="visible">True</property>