Adding a Views scrollbar implementation.

views/controls/scrollbar/scrollbar_unittest.cc

+// Copyright (c) 2011 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 "views/controls/scrollbar/scroll_bar.h"
+#include "views/controls/scrollbar/native_scroll_bar.h"
+#include "views/controls/scrollbar/native_scroll_bar_views.h"
+#include "views/test/views_test_base.h"
+#include "views/widget/widget.h"
+
+namespace {
+
+// The Scrollbar controller. This is the widget that should do the real
+// scrolling of contents.
+class TestScrollBarController : public views::ScrollBarController {
+ public:
+  virtual ~TestScrollBarController() {}
+
+  virtual void ScrollToPosition(views::ScrollBar* source,
+                                int position) OVERRIDE {
+    last_source = source;
+    last_position = position;
+  }
+
+  virtual int GetScrollIncrement(views::ScrollBar* source,
+                                 bool is_page,
+                                 bool is_positive) OVERRIDE {
+    last_source = source;
+    last_is_page = is_page;
+    last_is_positive = is_positive;
+
+    if (is_page)
+      return 20;
+    return 10;
+  }
+
+  // We save the last values in order to assert the corectness of the scroll
+  // operation.
+  views::ScrollBar* last_source;
+  bool last_is_positive;
+  bool last_is_page;
+  int last_position;
+};
+
+}  // namespace
+
+namespace views {
+
+class NativeScrollBarTest : public ViewsTestBase {
+ public:
+  NativeScrollBarTest()
+    : widget_(NULL),
+      scrollbar_(NULL),
+      controller_(NULL) {
+  }
+
+  virtual void SetUp() {
+    ViewsTestBase::SetUp();
+    Widget::SetPureViews(true);
+  }
+
+  virtual void TearDown() {
+    Widget::SetPureViews(false);
+    if (widget_)
+      widget_->Close();
+    ViewsTestBase::TearDown();
+  }
+
+  void InitScrollBar() {
+    controller_.reset(new TestScrollBarController());
+
+    ASSERT_FALSE(scrollbar_);
+    native_scrollbar_ = new NativeScrollBar(true);
+    native_scrollbar_->SetBounds(0, 0, 100, 100);
+    scrollbar_ = new NativeScrollBarViews(native_scrollbar_);
+    scrollbar_->SetController(controller_.get());
+
+    widget_ = new Widget;
+    Widget::InitParams params(Widget::InitParams::TYPE_POPUP);
+    params.bounds = gfx::Rect(0, 0, 100, 100);
+    widget_->Init(params);
+    View* container = new View();
+    widget_->SetContentsView(container);
+    container->AddChildView(scrollbar_);
+    scrollbar_->SetBounds(0, 0, 100, 100);
+    scrollbar_->Update(100, 200, 0);
+
+    track_size_ = scrollbar_->GetTrackBounds().width();
+  }
+
+ protected:
+  Widget* widget_;
+
+  // This is the native scrollbar the Views one wraps around.
+  NativeScrollBar* native_scrollbar_;
+
+  // This is the Views scrollbar.
+  BaseScrollBar* scrollbar_;
+
+  // Keep track of the size of the track. This is how we can tell when we
+  // scroll to the middle.
+  int track_size_;
+
+  scoped_ptr<TestScrollBarController> controller_;
+};
+
+// TODO(dnicoara) Can't run the test on Windows since the scrollbar |Part|
+// isn't handled in NativeTheme.
+#if defined(OS_WIN)
+TEST_F(NativeScrollBarTest, DISABLED_Scrolling) {
+#else
+TEST_F(NativeScrollBarTest, Scrolling) {
+#endif
+  InitScrollBar();
+  EXPECT_EQ(scrollbar_->GetPosition(), 0);
+  EXPECT_EQ(scrollbar_->GetMaxPosition(), 100);
+  EXPECT_EQ(scrollbar_->GetMinPosition(), 0);
+
+  // Scroll to middle.
+  scrollbar_->ScrollToThumbPosition(track_size_ / 4, false);
+  EXPECT_EQ(controller_->last_position, 50);
+  EXPECT_EQ(controller_->last_source, native_scrollbar_);
+
+  // Scroll to the end.
+  scrollbar_->ScrollToThumbPosition(track_size_ / 2, false);
+  EXPECT_EQ(controller_->last_position, 100);
+
+  // Overscroll. Last position should be the maximum position.
+  scrollbar_->ScrollToThumbPosition(track_size_, false);
+  EXPECT_EQ(controller_->last_position, 100);
+
+  // Underscroll. Last position should be the minimum position.
+  scrollbar_->ScrollToThumbPosition(-10, false);
+  EXPECT_EQ(controller_->last_position, 0);
+
+  // Test the different fixed scrolling amounts. Generally used by buttons,
+  // or click on track.
+  scrollbar_->ScrollToThumbPosition(0, false);
+  scrollbar_->ScrollByAmount(BaseScrollBar::SCROLL_NEXT_LINE);
+  EXPECT_EQ(controller_->last_position, 10);
+
+  scrollbar_->ScrollByAmount(BaseScrollBar::SCROLL_PREV_LINE);
+  EXPECT_EQ(controller_->last_position, 0);
+
+  scrollbar_->ScrollByAmount(BaseScrollBar::SCROLL_NEXT_PAGE);
+  EXPECT_EQ(controller_->last_position, 20);
+
+  scrollbar_->ScrollByAmount(BaseScrollBar::SCROLL_PREV_PAGE);
+  EXPECT_EQ(controller_->last_position, 0);
+}
+
+}  // namespace views