[gnome-control-center/gbsneto/search-applications: 3/4] applications: Add a placeholder widget for the sidebar list

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 66941ab9fb36d62f12ce7b3503039e32fc7098dc
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Fri Mar 29 19:58:19 2019 -0300

    applications: Add a placeholder widget for the sidebar list
    
    So we keep it consistent with other lists that allow filtering,
    such as the main panel list itself.

 panels/applications/cc-applications-panel.ui | 47 ++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)
---
diff --git a/panels/applications/cc-applications-panel.ui b/panels/applications/cc-applications-panel.ui
index ea0bca9de..a73f08c9b 100644
--- a/panels/applications/cc-applications-panel.ui
+++ b/panels/applications/cc-applications-panel.ui
@@ -432,7 +432,54 @@
     <child>
       <object class="GtkListBox" id="sidebar_listbox">
         <property name="visible">True</property>
+        <property name="vexpand">True</property>
         <property name="selection-mode">browse</property>
+
+        <child type="placeholder">
+          <object class="GtkBox" id="empty_search_placeholder">
+            <property name="visible">True</property>
+            <property name="can_focus">False</property>
+            <property name="halign">center</property>
+            <property name="valign">center</property>
+            <property name="expand">True</property>
+            <property name="border_width">18</property>
+            <property name="orientation">vertical</property>
+            <property name="spacing">6</property>
+            <child>
+              <object class="GtkImage">
+                <property name="visible">True</property>
+                <property name="can_focus">False</property>
+                <property name="pixel_size">64</property>
+                <property name="icon_name">edit-find-symbolic</property>
+                <style>
+                  <class name="dim-label"/>
+                </style>
+              </object>
+            </child>
+            <child>
+              <object class="GtkLabel">
+                <property name="visible">True</property>
+                <property name="can_focus">False</property>
+                <property name="label" translatable="yes">No results found</property>
+                <attributes>
+                  <attribute name="weight" value="bold"/>
+                  <attribute name="scale" value="1.44"/>
+                </attributes>
+              </object>
+            </child>
+            <child>
+              <object class="GtkLabel">
+                <property name="visible">True</property>
+                <property name="can_focus">False</property>
+                <property name="label" translatable="yes">Try a different search</property>
+                <style>
+                  <class name="dim-label"/>
+                </style>
+              </object>
+            </child>
+          </object>
+        </child>
+
       </object>
     </child>
   </object>