Draggable peeking/fullscreen launcher with transparent background.

ash/shelf/shelf.cc

Index: ash/shelf/shelf.cc
diff --git a/ash/shelf/shelf.cc b/ash/shelf/shelf.cc
index dce85c9d256cd602c706d022184800ea776c7ae3..2bfa69902fe1734d078038992063ce4fbd5ec92d 100644
--- a/ash/shelf/shelf.cc
+++ b/ash/shelf/shelf.cc
@@ -9,6 +9,7 @@
 #include "ash/public/cpp/shell_window_ids.h"
 #include "ash/root_window_controller.h"
 #include "ash/session/session_controller.h"
+#include "ash/shelf/app_list_button.h"
 #include "ash/shelf/shelf_bezel_event_handler.h"
 #include "ash/shelf/shelf_controller.h"
 #include "ash/shelf/shelf_layout_manager.h"
@@ -18,6 +19,7 @@
 #include "ash/shell.h"
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
+#include "ui/app_list/app_list_features.h"
 #include "ui/display/types/display_constants.h"
 #include "ui/gfx/geometry/rect.h"
 
@@ -67,9 +69,12 @@ Shelf::Shelf() : shelf_locking_manager_(this) {
   // http://crbug.com/636647
   if (Shell::GetAshConfig() != Config::MASH)
     bezel_event_handler_ = base::MakeUnique<ShelfBezelEventHandler>(this);
+  Shell::Get()->AddShellObserver(this);
 }
 
-Shelf::~Shelf() {}
+Shelf::~Shelf() {
+  Shell::Get()->RemoveShellObserver(this);
+}
 
 // static
 Shelf* Shelf::ForWindow(aura::Window* window) {
@@ -323,6 +328,10 @@ ShelfView* Shelf::GetShelfViewForTesting() {
   return shelf_widget_->shelf_view_for_testing();
 }
 
+void Shelf::OnAppListIsActive() {
+  shelf_layout_manager()->OnAppListIsActive();
+}
+
 void Shelf::WillDeleteShelfLayoutManager() {
   if (Shell::GetAshConfig() == Config::MASH) {
     // TODO(sky): this should be removed once Shell is used everywhere.
@@ -363,4 +372,17 @@ void Shelf::OnBackgroundUpdated(ShelfBackgroundType background_type,
     observer.OnBackgroundTypeChanged(background_type, change_type);
 }
 
+void Shelf::OnAppListShownOrDismissed(bool shown, aura::Window* root_window) {
+  // Check if the AppList was shown on this display.
+  if (shelf_widget() == Shelf::ForWindow(root_window)->shelf_widget()) {
+    if (shown) {
+      shelf_widget()->GetAppListButton()->OnAppListShown();
+    } else {
+      shelf_widget()->GetAppListButton()->OnAppListDismissed();
+    }
+    if (app_list::features::IsFullscreenAppListEnabled())
+      OnAppListIsActive();
+  }
+}
+
 }  // namespace ash