[gnome-games] ui: Introduce CollectionsPage

[Alexander Mikhaylenko <alexm src gnome org>]

commit 8e037186ba6414a67bb21abaa5400b455d46165f
Author: Neville <nevilleantony98 gmail com>
Date:   Thu Jun 18 20:49:04 2020 +0530

    ui: Introduce CollectionsPage
    
    This will be used to display collections and games which belongs to a
    collection. The ui structure is as follows:
    
    GamesCollectionsPage
      Hdy.Deck
        CollectionsMainPage
        Stack (subpage_stack)
          GamesPage
          EmptyPage

 data/org.gnome.Games.gresource.xml |   1 +
 data/ui/collections-page.ui        |  43 +++++++++++
 src/meson.build                    |   1 +
 src/ui/collections-page.vala       | 146 +++++++++++++++++++++++++++++++++++++
 4 files changed, 191 insertions(+)
---
diff --git a/data/org.gnome.Games.gresource.xml b/data/org.gnome.Games.gresource.xml
index 0487f908..e8030e51 100644
--- a/data/org.gnome.Games.gresource.xml
+++ b/data/org.gnome.Games.gresource.xml
@@ -16,6 +16,7 @@
     <file preprocess="xml-stripblanks">ui/collection-icon-view.ui</file>
     <file preprocess="xml-stripblanks">ui/collection-view.ui</file>
     <file preprocess="xml-stripblanks">ui/collections-main-page.ui</file>
+    <file preprocess="xml-stripblanks">ui/collections-page.ui</file>
     <file preprocess="xml-stripblanks">ui/display-view.ui</file>
     <file preprocess="xml-stripblanks">ui/empty-collection.ui</file>
     <file preprocess="xml-stripblanks">ui/empty-search.ui</file>
diff --git a/data/ui/collections-page.ui b/data/ui/collections-page.ui
new file mode 100644
index 00000000..08b3ff67
--- /dev/null
+++ b/data/ui/collections-page.ui
@@ -0,0 +1,43 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<interface>
+  <requires lib="gtk+" version="3.24"/>
+  <template class="GamesCollectionsPage" parent="GtkBin">
+    <property name="visible">True</property>
+    <signal name="notify::is-search-mode" handler="update_can_swipe_back"/>
+    <signal name="notify::is-selection-mode" handler="update_can_swipe_back"/>
+    <child>
+      <object class="HdyDeck" id="collections_deck">
+        <property name="visible">True</property>
+        <property name="visible-child">collections_main_page</property>
+        <property name="can-swipe-back" bind-source="GamesCollectionsPage" bind-property="can-swipe-back"/>
+        <signal name="notify::visible-child" handler="on_visible_child_changed"/>
+        <child>
+          <object class="GamesCollectionsMainPage" id="collections_main_page">
+            <property name="visible">True</property>
+            <signal name="collection-activated" handler="on_collection_activated"/>
+          </object>
+        </child>
+        <child>
+          <object class="GtkStack" id="collections_subpage_stack">
+            <property name="visible">True</property>
+            <property name="visible-child">collections_subpage</property>
+            <child>
+              <object class="GamesGamesPage" id="collections_subpage">
+                <property name="visible">True</property>
+                <property name="is-selection-mode" bind-source="GamesCollectionsPage" 
bind-property="is-selection-mode"/>
+                <signal name="game-activated" handler="on_game_activated"/>
+                <signal name="gamepad-cancel-clicked" handler="on_subpage_back_clicked"/>
+                <style>
+                  <class name="gamesgamespage"/>
+                </style>
+              </object>
+            </child>
+            <child>
+              <object class="GamesCollectionEmpty" id="collection_empty_subpage"/>
+            </child>
+          </object>
+        </child>
+      </object>
+    </child>
+  </template>
+</interface>
\ No newline at end of file
diff --git a/src/meson.build b/src/meson.build
index 60bd5971..71610442 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -113,6 +113,7 @@ vala_sources = [
   'ui/collection-icon-view.vala',
   'ui/collection-view.vala',
   'ui/collections-main-page.vala',
+  'ui/collections-page.vala',
   'ui/display-bin.vala',
   'ui/display-view.vala',
   'ui/empty-collection.vala',
diff --git a/src/ui/collections-page.vala b/src/ui/collections-page.vala
new file mode 100644
index 00000000..d3e1a53f
--- /dev/null
+++ b/src/ui/collections-page.vala
@@ -0,0 +1,146 @@
+// This file is part of GNOME Games. License: GPL-3.0+.
+
+[GtkTemplate (ui = "/org/gnome/Games/ui/collections-page.ui")]
+private class Games.CollectionsPage : Gtk.Bin {
+       public signal void game_activated (Game game);
+       public signal void selected_items_changed ();
+
+       [GtkChild]
+       private Hdy.Deck collections_deck;
+       [GtkChild]
+       private CollectionsMainPage collections_main_page;
+       [GtkChild]
+       private Gtk.Stack collections_subpage_stack;
+       [GtkChild]
+       private GamesPage collections_subpage;
+       [GtkChild]
+       private CollectionEmpty collection_empty_subpage;
+
+       private bool _is_empty_collection;
+       public bool is_empty_collection {
+               get { return _is_empty_collection; }
+               set {
+                       _is_empty_collection = value;
+
+                       if (is_empty_collection)
+                               collections_subpage_stack.visible_child = collection_empty_subpage;
+                       else
+                               collections_subpage_stack.visible_child = collections_subpage;
+               }
+       }
+
+       public CollectionModel collection_model {
+               get { return collections_main_page.collection_model; }
+               set {
+                       collections_main_page.collection_model = value;
+               }
+       }
+
+       public bool is_search_mode { get; set; }
+       public bool is_subpage_open { get; set; }
+       public bool is_selection_mode { get; set; }
+       public bool can_swipe_back { get; set; }
+       public string collection_title { get; set; }
+
+       construct {
+               collections_main_page.gamepad_accepted.connect (() => {
+                       collections_subpage.select_default_game (Gtk.DirectionType.RIGHT);
+               });
+               collections_subpage.selected_items_changed.connect (() => {
+                       selected_items_changed ();
+               });
+               update_can_swipe_back ();
+       }
+
+       public void select_all () {
+               if (is_subpage_open)
+                       collections_subpage.select_all ();
+       }
+
+       public void select_none () {
+               if (is_subpage_open)
+                       collections_subpage.select_none ();
+       }
+
+       public Game[] get_selected_games () {
+               return collections_subpage.get_selected_games ();
+       }
+
+       public bool gamepad_button_press_event (Manette.Event event) {
+               return is_subpage_open ? collections_subpage.gamepad_button_press_event (event) :
+                                        collections_main_page.gamepad_button_press_event (event);
+       }
+
+       public bool gamepad_button_release_event (Manette.Event event) {
+               return is_subpage_open ? collections_subpage.gamepad_button_release_event (event) :
+                                        collections_main_page.gamepad_button_release_event (event);
+       }
+
+       public bool gamepad_absolute_axis_event (Manette.Event event) {
+               return is_subpage_open ? collections_subpage.gamepad_absolute_axis_event (event) :
+                                        collections_main_page.gamepad_absolute_axis_event (event);
+       }
+
+       public void reset_scroll_position () {
+               if (is_subpage_open)
+                       collections_subpage.reset_scroll_position ();
+               else
+                       collections_main_page.reset_scroll_position ();
+       }
+
+       public void update_is_empty_collection () {
+               is_empty_collection = collections_subpage.game_model.get_n_items () == 0;
+       }
+
+       public void set_filter (string[] filtering_terms) {
+               if (is_subpage_open)
+                       collections_subpage.set_filter (filtering_terms);
+       }
+
+       public Hdy.Deck get_collections_deck () {
+               return collections_deck;
+       }
+
+       public bool exit_subpage () {
+               return on_subpage_back_clicked ();
+       }
+
+       [GtkCallback]
+       private bool on_subpage_back_clicked () {
+               if (!is_subpage_open)
+                       return false;
+
+               is_search_mode = false;
+               collections_deck.visible_child = collections_main_page;
+               return true;
+       }
+
+       [GtkCallback]
+       private void on_collection_activated (Collection collection) {
+               collection_title = collection.get_title ();
+               collections_deck.visible_child = collections_subpage_stack;
+
+               is_empty_collection = collection.get_game_model ().get_n_items () == 0;
+               if (is_empty_collection)
+                       return;
+
+               collections_subpage.hide_stars = collection.get_hide_stars ();
+               collections_subpage.game_model = collection.get_game_model ();
+               collections_subpage.reset_scroll_position ();
+       }
+
+       [GtkCallback]
+       private void on_game_activated (Game game) {
+               game_activated (game);
+       }
+
+       [GtkCallback]
+       private void on_visible_child_changed () {
+               is_subpage_open = collections_deck.visible_child == collections_subpage_stack;
+       }
+
+       [GtkCallback]
+       private void update_can_swipe_back () {
+               can_swipe_back = !is_search_mode && !is_selection_mode;
+       }
+}