ash: Improved window maximize/restore animations

ash/wm/window_animations_unittest.cc

 // Copyright (c) 2012 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/window_animations.h"
 
 #include "ash/shell_window_ids.h"
 #include "ash/test/ash_test_base.h"
 #include "ui/aura/test/test_windows.h"
 #include "ui/aura/window.h"
 #include "ui/base/animation/animation_container_element.h"
 #include "ui/compositor/layer.h"
 #include "ui/compositor/layer_animator.h"
 
+using aura::Window;
+using ui::Layer;
+
 namespace ash {
 namespace internal {
 
 typedef ash::test::AshTestBase WindowAnimationsWorkspaceTest;
 
 TEST_F(WindowAnimationsWorkspaceTest, HideShow) {
   aura::Window* default_container =
       ash::Shell::GetInstance()->GetContainer(
           internal::kShellWindowId_DefaultContainer);
   scoped_ptr<aura::Window> window(
@@ skipping 75 matching lines @@
 
   // Layer target visibility changes according to Show/Hide.
   window->Show();
   EXPECT_TRUE(window->layer()->GetTargetVisibility());
   window->Hide();
   EXPECT_FALSE(window->layer()->GetTargetVisibility());
   window->Show();
   EXPECT_TRUE(window->layer()->GetTargetVisibility());
 }
 
+TEST_F(WindowAnimationsWorkspaceTest, CrossFadeToBounds) {
+  Window* default_container =
+      ash::Shell::GetInstance()->GetContainer(
+          internal::kShellWindowId_DefaultContainer);
+  scoped_ptr<Window> window(
+      aura::test::CreateTestWindowWithId(0, default_container));
+  window->SetBounds(gfx::Rect(5, 10, 320, 240));
+  window->Show();
+
+  Layer* old_layer = window->layer();
+  EXPECT_EQ(1.0f, old_layer->GetTargetOpacity());
+
+  // Cross fade to a larger size, as in a maximize animation.
+  CrossFadeToBounds(window.get(), gfx::Rect(0, 0, 640, 480));
+  // Window's layer has been replaced.
+  EXPECT_NE(old_layer, window->layer());
+  // Original layer stays opaque and stretches to new size.
+  EXPECT_EQ(1.0f, old_layer->GetTargetOpacity());
+  EXPECT_EQ("5,10 320x240", old_layer->bounds().ToString());
+  ui::Transform grow_transform;
+  grow_transform.ConcatScale(640.f / 320.f, 480.f / 240.f);
+  grow_transform.ConcatTranslate(-5.f, -10.f);
+  EXPECT_EQ(grow_transform, old_layer->GetTargetTransform());
+  // New layer animates in to the identity transform.
+  EXPECT_EQ(1.0f, window->layer()->GetTargetOpacity());
+  EXPECT_EQ(ui::Transform(), window->layer()->GetTargetTransform());
+
+  // Allow the animation observer to delete itself.
+  RunAllPendingInMessageLoop();
+
+  // Cross fade to a smaller size, as in a restore animation.
+  old_layer = window->layer();
+  CrossFadeToBounds(window.get(), gfx::Rect(5, 10, 320, 240));
+  // Again, window layer has been replaced.
+  EXPECT_NE(old_layer, window->layer());
+  // Original layer fades out and stretches down to new size.
+  EXPECT_EQ(0.0f, old_layer->GetTargetOpacity());
+  EXPECT_EQ("0,0 640x480", old_layer->bounds().ToString());
+  ui::Transform shrink_transform;
+  shrink_transform.ConcatScale(320.f / 640.f, 240.f / 480.f);
+  shrink_transform.ConcatTranslate(5.f, 10.f);
+  EXPECT_EQ(shrink_transform, old_layer->GetTargetTransform());
+  // New layer animates in to the identity transform.
+  EXPECT_EQ(1.0f, window->layer()->GetTargetOpacity());
+  EXPECT_EQ(ui::Transform(), window->layer()->GetTargetTransform());
+
+  RunAllPendingInMessageLoop();
+}
+
 }  // namespace internal
 }  // namespace ash