ui/views/controls/scrollbar/scrollbar_unittest.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "ui/views/controls/scrollbar/native_scroll_bar.h"
   6 #include "ui/views/controls/scrollbar/native_scroll_bar_views.h"
   7 #include "ui/views/controls/scrollbar/scroll_bar.h"
   8 #include "ui/views/test/views_test_base.h"
   9 #include "ui/views/widget/widget.h"
  10
  11 namespace {
  12
  13 // The Scrollbar controller. This is the widget that should do the real
  14 // scrolling of contents.
  15 class TestScrollBarController : public views::ScrollBarController {
  16  public:
  17   virtual ~TestScrollBarController() {}
  18
  19   void ScrollToPosition(views::ScrollBar* source, int position) override {
  20     last_source = source;
  21     last_position = position;
  22   }
  23
  24   int GetScrollIncrement(views::ScrollBar* source,
  25                          bool is_page,
  26                          bool is_positive) override {
  27     last_source = source;
  28     last_is_page = is_page;
  29     last_is_positive = is_positive;
  30
  31     if (is_page)
  32       return 20;
  33     return 10;
  34   }
  35
  36   // We save the last values in order to assert the corectness of the scroll
  37   // operation.
  38   views::ScrollBar* last_source;
  39   bool last_is_positive;
  40   bool last_is_page;
  41   int last_position;
  42 };
  43
  44 }  // namespace
  45
  46 namespace views {
  47
  48 class NativeScrollBarTest : public ViewsTestBase {
  49  public:
  50   NativeScrollBarTest() : widget_(NULL), scrollbar_(NULL) {}
  51
  52   void SetUp() override {
  53     ViewsTestBase::SetUp();
  54     controller_.reset(new TestScrollBarController());
  55
  56     ASSERT_FALSE(scrollbar_);
  57     native_scrollbar_ = new NativeScrollBar(true);
  58     native_scrollbar_->SetBounds(0, 0, 100, 100);
  59     native_scrollbar_->set_controller(controller_.get());
  60
  61     widget_ = new Widget;
  62     Widget::InitParams params = CreateParams(Widget::InitParams::TYPE_POPUP);
  63     params.bounds = gfx::Rect(0, 0, 100, 100);
  64     widget_->Init(params);
  65     View* container = new View();
  66     widget_->SetContentsView(container);
  67     container->AddChildView(native_scrollbar_);
  68
  69     scrollbar_ =
  70         static_cast<NativeScrollBarViews*>(native_scrollbar_->native_wrapper_);
  71     scrollbar_->SetBounds(0, 0, 100, 100);
  72     scrollbar_->Update(100, 200, 0);
  73
  74     track_size_ = scrollbar_->GetTrackBounds().width();
  75   }
  76
  77   void TearDown() override {
  78     widget_->Close();
  79     ViewsTestBase::TearDown();
  80   }
  81
  82  protected:
  83   Widget* widget_;
  84
  85   // This is the native scrollbar the Views one wraps around.
  86   NativeScrollBar* native_scrollbar_;
  87
  88   // This is the Views scrollbar.
  89   BaseScrollBar* scrollbar_;
  90
  91   // Keep track of the size of the track. This is how we can tell when we
  92   // scroll to the middle.
  93   int track_size_;
  94
  95   scoped_ptr<TestScrollBarController> controller_;
  96 };
  97
  98 // TODO(dnicoara) Can't run the test on Windows since the scrollbar |Part|
  99 // isn't handled in NativeTheme.
 100 #if defined(OS_WIN)
 101 #define MAYBE_Scrolling DISABLED_Scrolling
 102 #define MAYBE_ScrollBarFitsToBottom DISABLED_ScrollBarFitsToBottom
 103 #else
 104 #define MAYBE_Scrolling Scrolling
 105 #define MAYBE_ScrollBarFitsToBottom ScrollBarFitsToBottom
 106 #endif
 107
 108 TEST_F(NativeScrollBarTest, MAYBE_Scrolling) {
 109   EXPECT_EQ(scrollbar_->GetPosition(), 0);
 110   EXPECT_EQ(scrollbar_->GetMaxPosition(), 100);
 111   EXPECT_EQ(scrollbar_->GetMinPosition(), 0);
 112
 113   // Scroll to middle.
 114   scrollbar_->ScrollToThumbPosition(track_size_ / 4, false);
 115   EXPECT_EQ(controller_->last_position, 50);
 116   EXPECT_EQ(controller_->last_source, native_scrollbar_);
 117
 118   // Scroll to the end.
 119   scrollbar_->ScrollToThumbPosition(track_size_ / 2, false);
 120   EXPECT_EQ(controller_->last_position, 100);
 121
 122   // Overscroll. Last position should be the maximum position.
 123   scrollbar_->ScrollToThumbPosition(track_size_, false);
 124   EXPECT_EQ(controller_->last_position, 100);
 125
 126   // Underscroll. Last position should be the minimum position.
 127   scrollbar_->ScrollToThumbPosition(-10, false);
 128   EXPECT_EQ(controller_->last_position, 0);
 129
 130   // Test the different fixed scrolling amounts. Generally used by buttons,
 131   // or click on track.
 132   scrollbar_->ScrollToThumbPosition(0, false);
 133   scrollbar_->ScrollByAmount(BaseScrollBar::SCROLL_NEXT_LINE);
 134   EXPECT_EQ(controller_->last_position, 10);
 135
 136   scrollbar_->ScrollByAmount(BaseScrollBar::SCROLL_PREV_LINE);
 137   EXPECT_EQ(controller_->last_position, 0);
 138
 139   scrollbar_->ScrollByAmount(BaseScrollBar::SCROLL_NEXT_PAGE);
 140   EXPECT_EQ(controller_->last_position, 20);
 141
 142   scrollbar_->ScrollByAmount(BaseScrollBar::SCROLL_PREV_PAGE);
 143   EXPECT_EQ(controller_->last_position, 0);
 144 }
 145
 146 TEST_F(NativeScrollBarTest, MAYBE_ScrollBarFitsToBottom) {
 147   scrollbar_->Update(100, 199, 0);
 148   EXPECT_EQ(0, scrollbar_->GetPosition());
 149   EXPECT_EQ(99, scrollbar_->GetMaxPosition());
 150   EXPECT_EQ(0, scrollbar_->GetMinPosition());
 151
 152   scrollbar_->Update(100, 199, 99);
 153   EXPECT_EQ(
 154       scrollbar_->GetTrackBounds().width() - scrollbar_->GetThumbSizeForTest(),
 155       scrollbar_->GetPosition());
 156 }
 157
 158 TEST_F(NativeScrollBarTest, ScrollToEndAfterShrinkAndExpand) {
 159   // Scroll to the end of the content.
 160   scrollbar_->Update(100, 101, 0);
 161   EXPECT_TRUE(scrollbar_->ScrollByContentsOffset(-1));
 162   // Shrink and then re-exapnd the content.
 163   scrollbar_->Update(100, 100, 0);
 164   scrollbar_->Update(100, 101, 0);
 165   // Ensure the scrollbar allows scrolling to the end.
 166   EXPECT_TRUE(scrollbar_->ScrollByContentsOffset(-1));
 167 }
 168
 169 }  // namespace views