Add magnifier_controller unittest

BUG=none
TEST=ash_unittests passes
R=zork@chromium.org
TBR=derat@chromium.org
# TBRing for modifying only magnifier related code.

Review URL: https://chromiumcodereview.appspot.com/11886043

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@177145 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 158 insertions, 0 deletions

diff --git a/ash/ash.gyp b/ash/ash.gyp
index 5c68b03..da2788f 100644
--- a/ash/ash.gyp
+++ b/ash/ash.gyp
@@ -561,6 +561,7 @@
         'launcher/launcher_tooltip_manager_unittest.cc',
         'launcher/launcher_unittest.cc',
         'launcher/launcher_view_unittest.cc',
+        'magnifier/magnification_controller_unittest.cc',
         'root_window_controller_unittest.cc',
         'screen_ash_unittest.cc',
         'screensaver/screensaver_view_unittest.cc',
diff --git a/ash/magnifier/magnification_controller_unittest.cc b/ash/magnifier/magnification_controller_unittest.cc
new file mode 100644
index 0000000..bc2c5ad
--- /dev/null
+++ b/ash/magnifier/magnification_controller_unittest.cc
@@ -0,0 +1,157 @@
+// Copyright (c) 2013 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/display/display_controller.h"
+#include "ash/magnifier/magnification_controller.h"
+#include "ash/shell.h"
+#include "ash/test/ash_test_base.h"
+#include "base/stringprintf.h"
+#include "ui/aura/client/aura_constants.h"
+#include "ui/aura/root_window.h"
+#include "ui/gfx/rect_conversions.h"
+#include "ui/gfx/screen.h"
+
+namespace ash {
+namespace internal {
+namespace {
+
+const int kRootHeight = 600;
+const int kRootWidth = 800;
+
+}  // namespace
+
+class MagnificationControllerTest: public test::AshTestBase {
+ public:
+  MagnificationControllerTest() {}
+  virtual ~MagnificationControllerTest() {}
+
+  virtual void SetUp() OVERRIDE {
+    AshTestBase::SetUp();
+    UpdateDisplay(StringPrintf("%dx%d", kRootWidth, kRootHeight));
+
+    aura::RootWindow* root = GetRootWindow();
+    gfx::Rect root_bounds(root->bounds());
+
+#if defined(OS_WIN)
+    // RootWindow and Display can't resize on Windows Ash.
+    // http://crbug.com/165962
+    EXPECT_EQ(kRootHeight, root_bounds.height());
+    EXPECT_EQ(kRootWidth, root_bounds.width());
+#endif
+  }
+
+  virtual void TearDown() OVERRIDE {
+    AshTestBase::TearDown();
+  }
+
+ protected:
+  aura::RootWindow* GetRootWindow() {
+    return Shell::GetPrimaryRootWindow();
+  }
+
+  ash::MagnificationController* GetMagnificationController() {
+    return ash::Shell::GetInstance()->magnification_controller();
+  }
+
+  gfx::Rect GetViewport() {
+    gfx::RectF bounds(0, 0, kRootWidth, kRootHeight);
+    GetRootWindow()->layer()->transform().TransformRectReverse(&bounds);
+    return gfx::ToEnclosingRect(bounds);
+  }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(MagnificationControllerTest);
+};
+
+TEST_F(MagnificationControllerTest, EnableAndDisable) {
+  // Confirms the magnifier is disabled.
+  EXPECT_TRUE(GetRootWindow()->layer()->transform().IsIdentity());
+  EXPECT_EQ(1.0f, GetMagnificationController()->GetScale());
+  EXPECT_EQ("0,0 800x600", GetViewport().ToString());
+
+  // Enables magnifier.
+  GetMagnificationController()->SetEnabled(true);
+  EXPECT_FALSE(GetRootWindow()->layer()->transform().IsIdentity());
+  EXPECT_EQ(2.0f, GetMagnificationController()->GetScale());
+  EXPECT_EQ("200,150 400x300", GetViewport().ToString());
+
+  // Disables magnifier.
+  GetMagnificationController()->SetEnabled(false);
+  EXPECT_TRUE(GetRootWindow()->layer()->transform().IsIdentity());
+  EXPECT_EQ(1.0f, GetMagnificationController()->GetScale());
+  EXPECT_EQ("0,0 800x600", GetViewport().ToString());
+
+  // Confirms the the scale can't be changed.
+  GetMagnificationController()->SetScale(4.0f, false);
+  EXPECT_TRUE(GetRootWindow()->layer()->transform().IsIdentity());
+  EXPECT_EQ(1.0f, GetMagnificationController()->GetScale());
+  EXPECT_EQ("0,0 800x600", GetViewport().ToString());
+}
+
+TEST_F(MagnificationControllerTest, MagnifyAndUnmagnify) {
+  // Enables magnifier and confirms the default scale is 2.0x.
+  GetMagnificationController()->SetEnabled(true);
+  EXPECT_FALSE(GetRootWindow()->layer()->transform().IsIdentity());
+  EXPECT_EQ(2.0f, GetMagnificationController()->GetScale());
+  EXPECT_EQ("200,150 400x300", GetViewport().ToString());
+
+  // Changes the scale.
+  GetMagnificationController()->SetScale(4.0f, false);
+  EXPECT_EQ(4.0f, GetMagnificationController()->GetScale());
+  EXPECT_EQ("300,225 200x150", GetViewport().ToString());
+
+  GetMagnificationController()->SetScale(1.0f, false);
+  EXPECT_EQ(1.0f, GetMagnificationController()->GetScale());
+  EXPECT_EQ("0,0 800x600", GetViewport().ToString());
+
+  GetMagnificationController()->SetScale(3.0f, false);
+  EXPECT_EQ(3.0f, GetMagnificationController()->GetScale());
+  EXPECT_EQ("266,200 268x200", GetViewport().ToString());
+}
+
+TEST_F(MagnificationControllerTest, MoveWindow) {
+  // Enables magnifier and confirm the viewport is at center.
+  GetMagnificationController()->SetEnabled(true);
+  EXPECT_EQ(2.0f, GetMagnificationController()->GetScale());
+  EXPECT_EQ("200,150 400x300", GetViewport().ToString());
+
+  // Move the viewport.
+  GetMagnificationController()->MoveWindow(0, 0, false);
+  EXPECT_EQ("0,0 400x300", GetViewport().ToString());
+
+  GetMagnificationController()->MoveWindow(200, 300, false);
+  EXPECT_EQ("200,300 400x300", GetViewport().ToString());
+
+  GetMagnificationController()->MoveWindow(400, 0, false);
+  EXPECT_EQ("400,0 400x300", GetViewport().ToString());
+
+  GetMagnificationController()->MoveWindow(400, 300, false);
+  EXPECT_EQ("400,300 400x300", GetViewport().ToString());
+
+  // Confirms that the viewport can't across the top-left border.
+  GetMagnificationController()->MoveWindow(-100, 0, false);
+  EXPECT_EQ("0,0 400x300", GetViewport().ToString());
+
+  GetMagnificationController()->MoveWindow(0, -100, false);
+  EXPECT_EQ("0,0 400x300", GetViewport().ToString());
+
+  GetMagnificationController()->MoveWindow(-100, -100, false);
+  EXPECT_EQ("0,0 400x300", GetViewport().ToString());
+
+  // Confirms that the viewport can't across the bittom-right border.
+  GetMagnificationController()->MoveWindow(800, 0, false);
+  EXPECT_EQ("400,0 400x300", GetViewport().ToString());
+
+  GetMagnificationController()->MoveWindow(0, 400, false);
+  EXPECT_EQ("0,300 400x300", GetViewport().ToString());
+
+  GetMagnificationController()->MoveWindow(200, 400, false);
+  EXPECT_EQ("200,300 400x300", GetViewport().ToString());
+
+  GetMagnificationController()->MoveWindow(1000, 1000, false);
+  EXPECT_EQ("400,300 400x300", GetViewport().ToString());
+}
+
+}  // namespace internal
+}  // namespace ash