CrOS Tablet Window management - Split Screen part I

ash/wm/workspace/backdrop_controller.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/wm/workspace/backdrop_controller.h"
 
 #include "ash/accessibility_delegate.h"
 #include "ash/public/cpp/shell_window_ids.h"
 #include "ash/root_window_controller.h"
 #include "ash/shared/app_types.h"
@@ skipping 123 matching lines @@
   container_->StackChildAbove(backdrop_window_, window);
   container_->StackChildAbove(window, backdrop_window_);
 }
 
 void BackdropController::OnOverviewModeStarting() {
   force_hidden_ = true;
   Hide();
 }
 
 void BackdropController::OnOverviewModeEnded() {
+  if (Shell::Get()->IsSplitViewModeActive())
+    return;
+
   force_hidden_ = false;
   UpdateBackdrop();
 }
+
+void BackdropController::OnSplitViewModeStarting() {
+  force_hidden_ = true;
+  Hide();
+}
+
+void BackdropController::OnSplitViewModeEnded() {
+  force_hidden_ = false;
+  UpdateBackdrop();
+}
 
 void BackdropController::OnAccessibilityModeChanged(
     AccessibilityNotificationVisibility notify) {
   UpdateBackdrop();
 }
 
 void BackdropController::EnsureBackdropWidget() {
   if (backdrop_)
     return;
 
@@ skipping 77 matching lines @@
   if (!backdrop_)
     return;
   backdrop_->Close();
   backdrop_ = nullptr;
   backdrop_window_ = nullptr;
   original_event_handler_ = nullptr;
   backdrop_event_handler_.reset();
 }
 
 }  // namespace ash