[ash-md] Animates ToggleButton highlight to move it in sync with the thumb

ui/views/controls/button/toggle_button_unittest.cc

+// Copyright (c) 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 "ui/views/controls/button/toggle_button.h"
+
+#include "base/macros.h"
+#include "base/memory/ptr_util.h"
+#include "build/build_config.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "ui/events/event_utils.h"
+#include "ui/views/test/views_test_base.h"
+
+namespace views {
+
+class TestToggleButton : public ToggleButton {
+ public:
+  explicit TestToggleButton(int* counter)
+      : ToggleButton(nullptr), counter_(counter) {}
+  ~TestToggleButton() override {
+    // Calling SetInkDropMode() in this subclass allows this class's
+    // implementation of RemoveInkDropLayer() to be called. The same
+    // call is made in ~ToggleButton() so this is testing the general technique.
+    SetInkDropMode(InkDropMode::OFF);
+  }
+
+ protected:
+  // ToggleButton:
+  void AddInkDropLayer(ui::Layer* ink_drop_layer) override {
+    ++(*counter_);
+    ToggleButton::AddInkDropLayer(ink_drop_layer);
+  }
+
+  void RemoveInkDropLayer(ui::Layer* ink_drop_layer) override {
+    ToggleButton::RemoveInkDropLayer(ink_drop_layer);
+    --(*counter_);
+  }
+
+ private:
+  int* counter_;
+
+  DISALLOW_COPY_AND_ASSIGN(TestToggleButton);
+};
+
+class ToggleButtonTest : public ViewsTestBase {
+ public:
+  ToggleButtonTest() {}
+  ~ToggleButtonTest() override {}
+
+  void SetUp() override {
+    ViewsTestBase::SetUp();
+
+    // Create a widget so that the ToggleButton can query the hover state
+    // correctly.
+    widget_.reset(new Widget);
+    Widget::InitParams params = CreateParams(Widget::InitParams::TYPE_POPUP);
+    params.ownership = views::Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET;
+    params.bounds = gfx::Rect(0, 0, 650, 650);
+    widget_->Init(params);
+    widget_->Show();
+
+    button_ = new TestToggleButton(&counter_);
+    widget_->SetContentsView(button_);
+  }
+
+  void TearDown() override {
+    widget_.reset();
+    ViewsTestBase::TearDown();
+  }
+
+ protected:
+  int counter() const { return counter_; }
+  Widget* widget() { return widget_.get(); }
+  TestToggleButton* button() { return button_; }
+
+ private:
+  std::unique_ptr<Widget> widget_;
+  TestToggleButton* button_ = nullptr;
+  int counter_ = 0;
+
+  DISALLOW_COPY_AND_ASSIGN(ToggleButtonTest);
+};
+
+// Starts ink drop animation on a ToggleButton and destroys the button.
+// The test verifies that the ink drop layer is removed properly when the
+// ToggleButton gets destroyed.
+TEST_F(ToggleButtonTest, ToggleButtonDestroyed) {
+  EXPECT_EQ(0, counter());
+  gfx::Point center(10, 10);
+  button()->OnMousePressed(ui::MouseEvent(
+      ui::ET_MOUSE_PRESSED, center, center, ui::EventTimeForNow(),
+      ui::EF_LEFT_MOUSE_BUTTON, ui::EF_LEFT_MOUSE_BUTTON));
+  EXPECT_EQ(1, counter());
+  delete button();
+  EXPECT_EQ(0, counter());
+}
+
+}  // namespace views