Re #204: Add and remove pages when navigating

This is the harshest version of removing pages when we're not using
them. We only keep extra pages in the stack until we're done with them.
But the pages are still created and keep state, so they don't lose
positions etc

Also now pass the main window around so that we don't assume a
base/parent when it might not be set.

This won't work as-is with the libhandy redesign (because we need to
keep all of the main tabs as children so we populate the switcher).

src/DefaultTimeline.vala

@@ -35,6 +35,7 @@ public abstract class DefaultTimeline : ScrollWidget, IPage {
   public unowned MainWindow window  {
     set {
       main_window = value;
+      tweet_list.main_window = main_window;
     }
   }
   public TweetListBox tweet_list = new TweetListBox ();

src/ListStatusesPage.vala

@@ -33,6 +33,7 @@ class ListStatusesPage : ScrollWidget, Cb.MessageReceiver, IPage {
   public unowned MainWindow window {
     set {
       main_window = value;
+      tweet_list.main_window = main_window;
     }
   }
   public unowned Account account;

src/MainWidget.vala

@@ -56,13 +56,11 @@ public class MainWidget : Gtk.Box {
     stack.notify["transition-running"].connect(() => {
       if (stack.transition_running == false) {
         var visible_child = stack.visible_child;
-        stack.get_children().foreach((w) => { if (w != visible_child) { w.hide(); }});
+        stack.get_children().foreach((w) => { if (w != visible_child) { stack.remove(w); }});
       }
     });
     this.add (stack);
 
-    stack.add (stack_impostor);
-
     pages     = new IPage[11];
     pages[0]  = new HomeTimeline (Page.STREAM, account);
     pages[1]  = new MentionsTimeline (Page.MENTIONS, account);
@@ -85,7 +83,7 @@ public class MainWidget : Gtk.Box {
         account.user_stream.register ((Cb.MessageReceiver)page);
 
       page.create_radio_button (dummy_button);
-      stack.add (page);
+
       if (page.get_radio_button () != null) {
         top_box.add (page.get_radio_button ());
         page.get_radio_button ().clicked.connect (() => {
@@ -146,12 +144,18 @@ public class MainWidget : Gtk.Box {
       args = history.get_current_bundle ();
     }
 
+    IPage page = pages[page_id];
+
     if (page_id == current_page) {
-      stack_impostor.clone (pages[page_id]);
+      stack_impostor.clone (page);
       var transition_type = stack.transition_type;
       stack.transition_type = Gtk.StackTransitionType.NONE;
+      if (stack_impostor.parent == null) {
+        stack.add(stack_impostor);
+      }
       stack.set_visible_child (stack_impostor);
       stack.transition_type = transition_type;
+      stack.remove(page);
     }
 
     if (current_page != -1)
@@ -166,18 +170,20 @@ public class MainWidget : Gtk.Box {
     /* XXX The following will cause switch_page to be called twice
        because setting the active property of the button will cause
        the clicked event to be emitted, which will call switch_page. */
-    IPage page = pages[page_id];
     Gtk.ToggleButton button = page.get_radio_button ();
     page_switch_lock = true;
     if (button != null)
       button.active = true;
     else
       dummy_button.active = true;
 
+    if (page.parent == null) {
+      stack.add(page);
+    }
     /* on_join first, then set_visible_child so the new page is still !child-visible,
        so e.g. GtkStack transitions inside the page aren't animated */
     page.on_join (page_id, args);
-    page.show();
+    page.show_all();
     stack.set_visible_child (page);
     ((MainWindow)this.parent).set_window_title (page.get_title (), stack.transition_type);
 

src/ProfilePage.vala

@@ -35,6 +35,9 @@ class ProfilePage : ScrollWidget, IPage, Cb.MessageReceiver {
     set {
       main_window = value;
       user_lists.main_window = value;
+      tweet_list.main_window = main_window;
+      followers_list.main_window = main_window;
+      followers_list.main_window = main_window;
     }
   }
   public unowned Account account;

src/SearchPage.vala

@@ -29,6 +29,7 @@ class SearchPage : IPage, Cb.MessageReceiver, Gtk.Box {
   public unowned MainWindow window {
     set {
       main_window = value;
+      tweet_list.main_window = main_window;
     }
   }
 

src/TweetInfoPage.vala

@@ -38,6 +38,10 @@ class TweetInfoPage : IPage, ScrollWidget, Cb.MessageReceiver {
   public unowned MainWindow window {
     set {
       main_window = value;
+      replied_to_list_box.main_window = main_window;
+      replies_list_box.main_window = main_window;
+      self_replies_list_box.main_window = main_window;
+      mentioned_replies_list_box.main_window = main_window;
     }
   }
   public unowned Account account;

src/widgets/TweetListBox.vala

@@ -26,6 +26,7 @@ public class TweetListBox : ListBox {
       return _action_entry;
     }
   }
+  public MainWindow main_window { private get; set; }
 
   public TweetListBox () {
   }
@@ -48,7 +49,7 @@ public class TweetListBox : ListBox {
     assert (obj is Cb.Tweet);
 
     var row = new TweetListEntry ((Cb.Tweet) obj,
-                                  (MainWindow) get_toplevel (),
+                                  main_window,
                                   this.account);
     row.fade_in ();
     return row;

ui/tweet-info-page.ui

@@ -30,6 +30,7 @@
                 <child>
                   <object class="GtkLabel" id="missing_tweet_label">
                     <property name="visible">0</property>
+                    <property name="no-show-all">1</property>
                     <property name="margin-top">18</property>
                     <property name="margin-bottom">18</property>
                     <property name="margin-start">6</property>
@@ -41,6 +42,7 @@
                 <child>
                   <object class="TweetListBox" id="replied_to_list_box">
                     <property name="visible">0</property>
+                    <property name="no-show-all">1</property>
                     <property name="can-focus">False</property>
                     <property name="selection-mode">none</property>
                   </object>
@@ -439,21 +441,24 @@
 
                 <child>
                   <object class="TweetListBox" id="self_replies_list_box">
-                    <property name="visible">1</property>
+                    <property name="visible">0</property>
+                    <property name="no-show-all">1</property>
                     <property name="selection-mode">none</property>
                     <property name="hexpand">1</property>
                   </object>
                 </child>
                 <child>
                   <object class="TweetListBox" id="mentioned_replies_list_box">
-                    <property name="visible">1</property>
+                    <property name="visible">0</property>
+                    <property name="no-show-all">1</property>
                     <property name="selection-mode">none</property>
                     <property name="hexpand">1</property>
                   </object>
                 </child>
                 <child>
                   <object class="TweetListBox" id="replies_list_box">
-                    <property name="visible">1</property>
+                    <property name="visible">0</property>
+                    <property name="no-show-all">1</property>
                     <property name="selection-mode">none</property>
                     <property name="hexpand">1</property>
                   </object>