Notify launcher page with onTransitionChanged event

ui/app_list/views/contents_view.h

Index: ui/app_list/views/contents_view.h
diff --git a/ui/app_list/views/contents_view.h b/ui/app_list/views/contents_view.h
index ade7fdbf388fe4283e79e5a78e7a565b49903b8e..58f7a12dcdde260a1619dfd7e266d9854c036f01 100644
--- a/ui/app_list/views/contents_view.h
+++ b/ui/app_list/views/contents_view.h
@@ -131,6 +131,12 @@ class APP_LIST_EXPORT ContentsView : public views::View,
   // with index |page_index|.
   gfx::Rect GetOffscreenPageBounds(int page_index) const;
 
+  // Notifies the view delegate that the custom launcher page's animation has
+  // changed.
+  void NotifyCustomLauncherPageAnimationChanged(double progress,
+                                                int current_page,
+                                                int target_page);
+
   // Calculates and sets the bounds for the subviews. If there is currently an
   // animation, this positions the views as appropriate for the current frame.
   void UpdatePageBounds();
@@ -159,6 +165,8 @@ class APP_LIST_EXPORT ContentsView : public views::View,
   SearchResultListView* search_results_view_;
   StartPageView* start_page_view_;
 
+  AppListViewDelegate* view_delegate_;

[tapted, 2014/11/06 06:05:45]

needs to be initialized.

But I'd prefer exposing the AppListMainView::delegate_, and getting the ALVD
with

app_list_main_view_->delegate(); (or writing a helper function that does that).

Then you could remove the delegate argument from ContentsView::Init as well.

[calamity, 2014/11/07 03:43:29]

Done.

+
   AppListMainView* app_list_main_view_;     // Parent view, owns this.
   // Sibling view, owned by |app_list_main_view_|.
   ContentsSwitcherView* contents_switcher_view_;