[gnome-boxes] Add CollectionFilterSwitcher widget

[Zeeshan Ali Khattak <zeeshanak src gnome org>]

commit bcede69a814281610eef06dee7479a47bd28afbb
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Thu Jul 2 10:20:21 2015 +0200

    Add CollectionFilterSwitcher widget
    
    Add CollectionFilterSwitcher class, a widget offering a box of linked
    toggle buttons allowing user to switch different filtering functions on
    a provided CollectionFilter.
    
    This will be used in the next commit as header for the main window to
    implement quick ready-made search toggles.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=751710

 data/gnome-boxes.gresource.xml        |    1 +
 data/ui/collection-filter-switcher.ui |   49 +++++++++++++++++++++++++++
 src/Makefile.am                       |    1 +
 src/collection-filter-switcher.vala   |   60 +++++++++++++++++++++++++++++++++
 4 files changed, 111 insertions(+), 0 deletions(-)
---
diff --git a/data/gnome-boxes.gresource.xml b/data/gnome-boxes.gresource.xml
index af12211..3db3ddd 100644
--- a/data/gnome-boxes.gresource.xml
+++ b/data/gnome-boxes.gresource.xml
@@ -7,6 +7,7 @@
     <file>icons/empty-boxes.png</file>
     <file preprocess="xml-stripblanks">ui/app-window.ui</file>
     <file preprocess="xml-stripblanks">ui/auth-notification.ui</file>
+    <file preprocess="xml-stripblanks">ui/collection-filter-switcher.ui</file>
     <file preprocess="xml-stripblanks">ui/collection-toolbar.ui</file>
     <file preprocess="xml-stripblanks">ui/display-page.ui</file>
     <file preprocess="xml-stripblanks">ui/display-toolbar.ui</file>
diff --git a/data/ui/collection-filter-switcher.ui b/data/ui/collection-filter-switcher.ui
new file mode 100644
index 0000000..5a8de58
--- /dev/null
+++ b/data/ui/collection-filter-switcher.ui
@@ -0,0 +1,49 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<interface>
+  <template class="BoxesCollectionFilterSwitcher" parent="GtkButtonBox">
+    <property name="visible">True</property>
+    <property name="homogeneous">True</property>
+    <style>
+      <class name="linked"/>
+    </style>
+
+    <child>
+      <object class="GtkToggleButton" id="all_button">
+        <property name="visible">True</property>
+        <property name="label" translatable="yes">All</property>
+        <signal name="toggled" handler="activate_button"/>
+      </object>
+
+      <packing>
+        <property name="expand">True</property>
+        <property name="fill">True</property>
+      </packing>
+    </child>
+
+    <child>
+      <object class="GtkToggleButton" id="local_button">
+        <property name="visible">True</property>
+        <property name="label" translatable="yes">Local</property>
+        <signal name="toggled" handler="activate_button"/>
+      </object>
+
+      <packing>
+        <property name="expand">True</property>
+        <property name="fill">True</property>
+      </packing>
+    </child>
+
+    <child>
+      <object class="GtkToggleButton" id="remote_button">
+        <property name="visible">True</property>
+        <property name="label" translatable="yes">Remote</property>
+        <signal name="toggled" handler="activate_button"/>
+      </object>
+
+      <packing>
+        <property name="expand">True</property>
+        <property name="fill">True</property>
+      </packing>
+    </child>
+  </template>
+</interface>
diff --git a/src/Makefile.am b/src/Makefile.am
index e22575f..3796b9a 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -103,6 +103,7 @@ gnome_boxes_SOURCES =                               \
        auth-notification.vala                  \
        collection-view.vala                    \
        collection.vala                         \
+       collection-filter-switcher.vala         \
        collection-toolbar.vala                 \
        display-page.vala                       \
        display-toolbar.vala                    \
diff --git a/src/collection-filter-switcher.vala b/src/collection-filter-switcher.vala
new file mode 100644
index 0000000..46bf99c
--- /dev/null
+++ b/src/collection-filter-switcher.vala
@@ -0,0 +1,60 @@
+// This file is part of GNOME Boxes. License: LGPLv2+
+
+[GtkTemplate (ui = "/org/gnome/Boxes/ui/collection-filter-switcher.ui")]
+private class Boxes.CollectionFilterSwitcher: Gtk.ButtonBox {
+    [GtkChild]
+    private Gtk.ToggleButton all_button;
+    [GtkChild]
+    private Gtk.ToggleButton local_button;
+    [GtkChild]
+    private Gtk.ToggleButton remote_button;
+
+    private Gtk.ToggleButton active_button;
+    private CollectionFilter filter;
+
+    public void setup_ui (AppWindow window) {
+        filter = window.view.filter;
+        assert (filter != null);
+
+        all_button.active = true;
+        activate_button (all_button);
+
+        filter.filter_func = null;
+    }
+
+    private unowned CollectionFilterFunc? get_filter_func () {
+        if (active_button == all_button)
+            return null;
+        if (active_button == local_button)
+            return local_filter_func;
+        if (active_button == remote_button)
+            return remote_filter_func;
+        else
+            return null;
+    }
+
+    private bool local_filter_func (Boxes.CollectionItem item) {
+        return (item is Machine) && (item as Machine).is_local;
+    }
+
+    private bool remote_filter_func (Boxes.CollectionItem item) {
+        return (item is Machine) && !(item as Machine).is_local;
+    }
+
+    [GtkCallback]
+    private void activate_button (Gtk.ToggleButton button) {
+        if (button == active_button)
+            return;
+
+        if (button.active)
+            active_button = button;
+
+        foreach (var child in get_children ()) {
+            var toggle_button = child as Gtk.ToggleButton;
+            if (toggle_button != null)
+                toggle_button.active = toggle_button == active_button;
+        }
+
+        filter.filter_func = get_filter_func ();
+    }
+}