[gnome-games/wip/exalm/mobile: 6/9] ui: Use HdyViewSwitcherBar for narrow mode

[Alexander Mikhaylenko <alexm src gnome org>]

commit cf7e9350fda1083d72cdd7147431c3c6f7996f64
Author: Alexander Mikhaylenko <exalm7659 gmail com>
Date:   Wed May 22 18:47:36 2019 +0500

    ui: Use HdyViewSwitcherBar for narrow mode
    
    Create AdaptiveState in CollectionView, pass it to CollectionBox and
    CollectionHeaderBar. Set its 'is-showing-bottom-bar' property to true when
    HdySqueezer in the headerbar is showing title instead of view switcher.
    
    Use it to show a HdyViewSwitcherBar in CollectionBox when it's true.

 data/ui/collection-box.ui         |  6 +++++
 data/ui/collection-header-bar.ui  |  6 ++---
 po/POTFILES.in                    |  1 +
 po/POTFILES.skip                  |  1 +
 src/ui/collection-box.vala        | 20 ++++++++++++++--
 src/ui/collection-header-bar.vala | 50 ++++++++++++++++++++++++++++++++++-----
 src/ui/collection-view.vala       |  7 ++++--
 7 files changed, 78 insertions(+), 13 deletions(-)
---
diff --git a/data/ui/collection-box.ui b/data/ui/collection-box.ui
index 50fa825f..344451a5 100644
--- a/data/ui/collection-box.ui
+++ b/data/ui/collection-box.ui
@@ -102,6 +102,12 @@
         </child>
       </object>
     </child>
+    <child>
+      <object class="HdyViewSwitcherBar" id="view_switcher_bar">
+        <property name="visible">True</property>
+        <property name="stack">viewstack</property>
+      </object>
+    </child>
   </template>
   <object class="GtkImage" id="close_icon">
     <property name="visible">True</property>
diff --git a/data/ui/collection-header-bar.ui b/data/ui/collection-header-bar.ui
index aadd4db9..3402063a 100644
--- a/data/ui/collection-header-bar.ui
+++ b/data/ui/collection-header-bar.ui
@@ -54,9 +54,10 @@
       </packing>
     </child>
     <child type="title">
-      <object class="GtkStack" id="title_stack">
+      <object class="HdySqueezer" id="title_squeezer">
         <property name="visible">True</property>
         <property name="transition-type">crossfade</property>
+        <signal name="notify::visible-child" handler="on_squeezer_visible_child_changed"/>
         <child>
           <object class="HdyViewSwitcher" id="view_switcher">
             <property name="visible">True</property>
@@ -64,9 +65,8 @@
           </object>
         </child>
         <child>
-          <object class="GtkLabel" id="empty_title">
+          <object class="GtkLabel" id="title_label">
             <property name="visible">True</property>
-            <property name="label" translatable="yes">Games</property>
             <style>
               <class name="title"/>
             </style>
diff --git a/po/POTFILES.in b/po/POTFILES.in
index 5221aa79..379b6b73 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -65,6 +65,7 @@ src/retro/retro-runner.vala
 src/retro/retro-simple-type.vala
 src/ui/application.vala
 src/ui/application-window.vala
+src/ui/collection-header-bar.vala
 src/ui/display-view.vala
 src/ui/error-display.vala
 src/ui/gamepad-mapper.vala
diff --git a/po/POTFILES.skip b/po/POTFILES.skip
index 83735b4f..566b73f4 100644
--- a/po/POTFILES.skip
+++ b/po/POTFILES.skip
@@ -40,6 +40,7 @@ src/retro/retro-runner.c
 src/retro/retro-simple-type.c
 src/ui/application.c
 src/ui/application-window.c
+src/ui/collection-header-bar.c
 src/ui/display-view.c
 src/ui/error-display.c
 src/ui/gamepad-mapper.c
diff --git a/src/ui/collection-box.vala b/src/ui/collection-box.vala
index e6d87b38..ae621b81 100644
--- a/src/ui/collection-box.vala
+++ b/src/ui/collection-box.vala
@@ -22,6 +22,9 @@ private class Games.CollectionBox : Gtk.Box {
        private PlatformsView platform_view;
        [GtkChild (name = "viewstack")]
        private Gtk.Stack _viewstack;
+       [GtkChild]
+       private Hdy.ViewSwitcherBar view_switcher_bar;
+
        public Gtk.Stack viewstack {
                get { return _viewstack; }
        }
@@ -38,13 +41,22 @@ private class Games.CollectionBox : Gtk.Box {
                }
        }
 
+       private AdaptiveState _adaptive_state;
+       public AdaptiveState adaptive_state {
+               get { return _adaptive_state; }
+               construct {
+                       _adaptive_state = value;
+                       adaptive_state.notify["is-showing-bottom-bar"].connect (update_bottom_bar);
+               }
+       }
+
        private Binding collection_binding;
        private Binding platform_collection_binding;
        private Binding search_binding;
        private Binding loading_notification_binding;
 
-       public CollectionBox (ListModel collection) {
-               Object (collection: collection);
+       public CollectionBox (ListModel collection, AdaptiveState adaptive_state) {
+               Object (collection: collection, adaptive_state: adaptive_state);
        }
 
        construct {
@@ -166,4 +178,8 @@ private class Games.CollectionBox : Gtk.Box {
        public bool search_bar_handle_event (Gdk.Event event) {
                return search_bar.handle_event (event);
        }
+
+       private void update_bottom_bar () {
+               view_switcher_bar.reveal = adaptive_state.is_showing_bottom_bar;
+       }
 }
diff --git a/src/ui/collection-header-bar.vala b/src/ui/collection-header-bar.vala
index 5f42ffcf..0cb9da68 100644
--- a/src/ui/collection-header-bar.vala
+++ b/src/ui/collection-header-bar.vala
@@ -7,8 +7,16 @@ private class Games.CollectionHeaderBar : Gtk.HeaderBar {
        public Gtk.Stack viewstack {
                get { return _viewstack; }
                set {
+                       if (viewstack_child_changed_id != 0) {
+                               viewstack.disconnect (viewstack_child_changed_id);
+                               viewstack_child_changed_id = 0;
+                       }
+
                        _viewstack = value;
                        view_switcher.stack = _viewstack;
+
+                       if (viewstack != null)
+                               viewstack_child_changed_id = viewstack.notify["visible-child"].connect 
(update_title);
                }
        }
 
@@ -17,26 +25,56 @@ private class Games.CollectionHeaderBar : Gtk.HeaderBar {
                get { return _is_collection_empty; }
                set {
                        _is_collection_empty = value;
-                       if (_is_collection_empty)
-                               title_stack.visible_child = empty_title;
-                       else
-                               title_stack.visible_child = view_switcher;
+                       title_squeezer.set_child_enabled (view_switcher, !value);
                        search.sensitive = !_is_collection_empty;
+                       update_adaptive_state ();
                }
        }
 
        [GtkChild]
-       private Gtk.Stack title_stack;
+       private Hdy.Squeezer title_squeezer;
        [GtkChild]
-       private Gtk.Label empty_title;
+       private Gtk.Label title_label;
        [GtkChild]
        private Hdy.ViewSwitcher view_switcher;
        [GtkChild]
        private Gtk.ToggleButton search;
        private Binding search_binding;
 
+       public AdaptiveState adaptive_state { get; construct; }
+
+       private ulong viewstack_child_changed_id;
+
        construct {
                search_binding = bind_property ("search-mode", search, "active",
                                                BindingFlags.BIDIRECTIONAL);
        }
+
+       public CollectionHeaderBar (AdaptiveState adaptive_state) {
+               Object (adaptive_state: adaptive_state);
+       }
+
+       [GtkCallback]
+       private void on_squeezer_visible_child_changed () {
+               update_adaptive_state ();
+       }
+
+       private void update_adaptive_state () {
+               bool showing_title = title_squeezer.visible_child != view_switcher;
+               adaptive_state.is_showing_bottom_bar = showing_title && !is_collection_empty;
+
+               update_title ();
+       }
+
+       private void update_title () {
+               var title = _("Games");
+
+               if (!is_collection_empty) {
+                       var child = viewstack.visible_child;
+
+                       viewstack.child_get (child, "title", out title, null);
+               }
+
+               title_label.label = title;
+       }
 }
diff --git a/src/ui/collection-view.vala b/src/ui/collection-view.vala
index 95c8cb5a..8455e5b9 100644
--- a/src/ui/collection-view.vala
+++ b/src/ui/collection-view.vala
@@ -58,10 +58,13 @@ private class Games.CollectionView : Object, UiView {
        private Binding header_bar_empty_collection_binding;
 
        private KonamiCode konami_code;
+       private AdaptiveState adaptive_state;
 
        construct {
-               box = new CollectionBox (collection);
-               header_bar = new CollectionHeaderBar ();
+               adaptive_state = new AdaptiveState ();
+
+               box = new CollectionBox (collection, adaptive_state);
+               header_bar = new CollectionHeaderBar (adaptive_state);
                box.game_activated.connect (game => {
                        game_activated (game);
                });