Added common layout framework for system menu rows.

ash/common/system/tray/size_range_layout_unittest.cc

Index: ash/common/system/tray/size_range_layout_unittest.cc
diff --git a/ash/common/system/tray/size_range_layout_unittest.cc b/ash/common/system/tray/size_range_layout_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..4db8c247b724c6720a42feb2dbff52199bf0a3c8
--- /dev/null
+++ b/ash/common/system/tray/size_range_layout_unittest.cc
@@ -0,0 +1,182 @@
+// Copyright 2016 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/common/system/tray/size_range_layout.h"
+#include "base/memory/ptr_util.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "ui/views/test/test_layout_manager.h"
+#include "ui/views/view.h"
+
+namespace ash {
+
+class SizeRangeLayoutTest : public testing::Test {
+ public:
+  SizeRangeLayoutTest();
+
+  // Wrapper function to access the minimum preferred size of |layout|.
+  gfx::Size GetMinSize(const SizeRangeLayout* layout) const;
+
+  // Wrapper function to access the maximum preferred size of |layout|.
+  gfx::Size GetMaxSize(const SizeRangeLayout* layout) const;
+
+ protected:
+  views::View host_;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(SizeRangeLayoutTest);
+};
+
+SizeRangeLayoutTest::SizeRangeLayoutTest() {}
+
+gfx::Size SizeRangeLayoutTest::GetMinSize(const SizeRangeLayout* layout) const {
+  return layout->min_size_;
+}
+
+gfx::Size SizeRangeLayoutTest::GetMaxSize(const SizeRangeLayout* layout) const {
+  return layout->max_size_;
+}
+
+TEST_F(SizeRangeLayoutTest, SizeRangeForDefaultConstruction) {
+  SizeRangeLayout layout;
+  EXPECT_EQ(SizeRangeLayout::AbsoluteMinSize(), GetMinSize(&layout));
+  EXPECT_EQ(SizeRangeLayout::AbsoluteMaxSize(), GetMaxSize(&layout));
+}
+
+TEST_F(SizeRangeLayoutTest, SizeRangeForExplicitConstruction) {
+  const gfx::Size kSmallSize = gfx::Size(13, 14);
+  const gfx::Size kLargeSize = gfx::Size(25, 26);
+
+  SizeRangeLayout layout(kSmallSize, kLargeSize);
+  EXPECT_EQ(kSmallSize, GetMinSize(&layout));
+  EXPECT_EQ(kLargeSize, GetMaxSize(&layout));
+}
+
+TEST_F(SizeRangeLayoutTest, InvalidMinSizeForExplicitConstruction) {
+  const gfx::Size kInvalidSmallSize(-1, 2);
+  const gfx::Size kExpectedMinSize(0, 2);
+
+  SizeRangeLayout layout(kInvalidSmallSize, SizeRangeLayout::AbsoluteMaxSize());
+  EXPECT_EQ(kExpectedMinSize, GetMinSize(&layout));
+}
+
+TEST_F(SizeRangeLayoutTest, InvalidMaxSizeForExplicitConstruction) {
+  const gfx::Size kInvalidSmallSize(-1, 2);
+  const gfx::Size kExpectedMinSize(0, 2);
+
+  SizeRangeLayout layout(kInvalidSmallSize, SizeRangeLayout::AbsoluteMaxSize());
+  EXPECT_EQ(kExpectedMinSize, GetMinSize(&layout));
+}
+
+TEST_F(SizeRangeLayoutTest, MaxSizeSmallerThanMinSizeConstruction) {
+  const gfx::Size kMinSize(10, 11);
+  const gfx::Size kMaxSize(5, 6);
+
+  SizeRangeLayout layout(kMinSize, kMaxSize);
+  EXPECT_EQ(kMaxSize, GetMinSize(&layout));
+  EXPECT_EQ(kMaxSize, GetMaxSize(&layout));
+}
+
+TEST_F(SizeRangeLayoutTest, SizeRangeForExplicitSetSize) {
+  const gfx::Size kSize = gfx::Size(13, 14);
+
+  SizeRangeLayout layout;
+  EXPECT_NE(kSize, GetMinSize(&layout));
+  EXPECT_NE(kSize, GetMaxSize(&layout));
+
+  layout.SetSize(kSize);
+  EXPECT_EQ(kSize, GetMinSize(&layout));
+  EXPECT_EQ(kSize, GetMaxSize(&layout));
+}
+
+TEST_F(SizeRangeLayoutTest, InvalidSizeRangesForExplicitSetSize) {
+  const gfx::Size kInvalidSize(-7, 8);
+  const gfx::Size kExpectedSize(0, 8);
+
+  SizeRangeLayout layout;
+  layout.SetSize(kInvalidSize);
+  EXPECT_EQ(kExpectedSize, GetMinSize(&layout));
+  EXPECT_EQ(kExpectedSize, GetMaxSize(&layout));
+}
+
+TEST_F(SizeRangeLayoutTest, InternalLayoutManagerPreferredSizeIsUsed) {
+  const gfx::Size kSize(7, 8);
+  std::unique_ptr<views::test::TestLayoutManager> child_layout =
+      base::MakeUnique<views::test::TestLayoutManager>();
+  child_layout->set_preferred_size(kSize);
+
+  SizeRangeLayout layout;
+  EXPECT_NE(kSize, layout.GetPreferredSize(&host_));
+
+  layout.SetLayoutManager(std::move(child_layout));
+  EXPECT_EQ(kSize, layout.GetPreferredSize(&host_));
+}
+
+TEST_F(SizeRangeLayoutTest, SmallPreferredSizeIsClamped) {
+  const gfx::Size kMinSize(10, 10);
+  const gfx::Size kMaxSize(20, 20);
+  const gfx::Size kLayoutPreferredSize(5, 5);
+  std::unique_ptr<views::test::TestLayoutManager> child_layout =
+      base::MakeUnique<views::test::TestLayoutManager>();
+  child_layout->set_preferred_size(kLayoutPreferredSize);
+
+  SizeRangeLayout layout;
+  layout.SetLayoutManager(std::move(child_layout));
+  layout.SetMinSize(kMinSize);
+  layout.SetMaxSize(kMaxSize);
+  EXPECT_EQ(kMinSize, layout.GetPreferredSize(&host_));
+}
+
+TEST_F(SizeRangeLayoutTest, LargePreferredSizeIsClamped) {
+  const gfx::Size kMinSize(10, 10);
+  const gfx::Size kMaxSize(20, 20);
+  const gfx::Size kLayoutPreferredSize(25, 25);
+  std::unique_ptr<views::test::TestLayoutManager> child_layout =
+      base::MakeUnique<views::test::TestLayoutManager>();
+  child_layout->set_preferred_size(kLayoutPreferredSize);
+
+  SizeRangeLayout layout;
+  layout.SetLayoutManager(std::move(child_layout));
+  layout.SetMinSize(kMinSize);
+  layout.SetMaxSize(kMaxSize);
+  EXPECT_EQ(kMaxSize, layout.GetPreferredSize(&host_));
+}
+
+TEST_F(SizeRangeLayoutTest, MaxSizeLargerThanMinSizeUpdatesMinSize) {
+  const gfx::Size kMinSize(10, 10);
+  const gfx::Size kMaxSize(5, 5);
+
+  SizeRangeLayout layout;
+  layout.SetMinSize(kMinSize);
+  EXPECT_EQ(kMinSize, GetMinSize(&layout));
+  layout.SetMaxSize(kMaxSize);
+  EXPECT_EQ(kMaxSize, GetMinSize(&layout));
+}
+
+TEST_F(SizeRangeLayoutTest, MinSizeSmallerThanMaxSizeUpdatesMaxSize) {
+  const gfx::Size kMinSize(10, 10);
+  const gfx::Size kMaxSize(5, 5);
+
+  SizeRangeLayout layout;
+  layout.SetMaxSize(kMaxSize);
+  EXPECT_EQ(kMaxSize, GetMaxSize(&layout));
+  layout.SetMinSize(kMinSize);
+  EXPECT_EQ(kMinSize, GetMaxSize(&layout));
+}
+
+TEST_F(SizeRangeLayoutTest,
+       InternalLayoutManagerPreferredHeightForWidthIsUsed) {
+  const int kWidth = 5;
+  const int kHeight = 9;
+  std::unique_ptr<views::test::TestLayoutManager> child_layout =
+      base::MakeUnique<views::test::TestLayoutManager>();
+  child_layout->set_preferred_height_for_width(kHeight);
+
+  SizeRangeLayout layout;
+  EXPECT_NE(kHeight, layout.GetPreferredHeightForWidth(&host_, kWidth));
+
+  layout.SetLayoutManager(std::move(child_layout));
+  EXPECT_EQ(kHeight, layout.GetPreferredHeightForWidth(&host_, kWidth));
+}
+
+}  // namespace ash