1// Copyright (c) 2013 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/kennedy_scroll_bar.h"
6
7#include "third_party/skia/include/core/SkColor.h"
8#include "third_party/skia/include/core/SkXfermode.h"
9#include "ui/gfx/canvas.h"
10#include "ui/views/background.h"
11#include "ui/views/border.h"
12#include "ui/views/controls/scrollbar/base_scroll_bar_thumb.h"
13
14namespace views {
15namespace {
16
17const int kScrollbarWidth = 10;
18const int kThumbMinimumSize = kScrollbarWidth * 2;
19const SkColor kBorderColor = SkColorSetARGB(32, 0, 0, 0);
20const SkColor kThumbHoverColor = SkColorSetARGB(128, 0, 0, 0);
21const SkColor kThumbDefaultColor = SkColorSetARGB(64, 0, 0, 0);
22const SkColor kTrackHoverColor = SkColorSetARGB(32, 0, 0, 0);
23
24class KennedyScrollBarThumb : public BaseScrollBarThumb {
25 public:
26  explicit KennedyScrollBarThumb(BaseScrollBar* scroll_bar);
27  virtual ~KennedyScrollBarThumb();
28
29 protected:
30  // View overrides:
31  virtual gfx::Size GetPreferredSize() const OVERRIDE;
32  virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
33
34 private:
35  DISALLOW_COPY_AND_ASSIGN(KennedyScrollBarThumb);
36};
37
38KennedyScrollBarThumb::KennedyScrollBarThumb(BaseScrollBar* scroll_bar)
39    : BaseScrollBarThumb(scroll_bar) {
40}
41
42KennedyScrollBarThumb::~KennedyScrollBarThumb() {
43}
44
45gfx::Size KennedyScrollBarThumb::GetPreferredSize() const {
46  return gfx::Size(kThumbMinimumSize, kThumbMinimumSize);
47}
48
49void KennedyScrollBarThumb::OnPaint(gfx::Canvas* canvas) {
50  gfx::Rect local_bounds(GetLocalBounds());
51  canvas->FillRect(local_bounds,
52                   (GetState() == CustomButton::STATE_HOVERED ||
53                    GetState() == CustomButton::STATE_PRESSED) ?
54                   kThumbHoverColor : kThumbDefaultColor);
55  canvas->DrawRect(local_bounds, kBorderColor);
56}
57
58}  // namespace
59
60KennedyScrollBar::KennedyScrollBar(bool horizontal)
61    : BaseScrollBar(horizontal, new KennedyScrollBarThumb(this)) {
62  set_notify_enter_exit_on_child(true);
63}
64
65KennedyScrollBar::~KennedyScrollBar() {
66}
67
68gfx::Rect KennedyScrollBar::GetTrackBounds() const {
69  gfx::Rect local_bounds(GetLocalBounds());
70  gfx::Size track_size = local_bounds.size();
71  track_size.SetToMax(GetThumb()->size());
72  local_bounds.set_size(track_size);
73  return local_bounds;
74}
75
76int KennedyScrollBar::GetLayoutSize() const {
77  return kScrollbarWidth;
78}
79
80gfx::Size KennedyScrollBar::GetPreferredSize() const {
81  return GetTrackBounds().size();
82}
83
84void KennedyScrollBar::Layout() {
85  gfx::Rect thumb_bounds = GetTrackBounds();
86  BaseScrollBarThumb* thumb = GetThumb();
87  if (IsHorizontal()) {
88    thumb_bounds.set_x(thumb->x());
89    thumb_bounds.set_width(thumb->width());
90  } else {
91    thumb_bounds.set_y(thumb->y());
92    thumb_bounds.set_height(thumb->height());
93  }
94  thumb->SetBoundsRect(thumb_bounds);
95}
96
97void KennedyScrollBar::OnPaint(gfx::Canvas* canvas) {
98  CustomButton::ButtonState state = GetThumbTrackState();
99  if ((state == CustomButton::STATE_HOVERED) ||
100      (state == CustomButton::STATE_PRESSED)) {
101    gfx::Rect local_bounds(GetLocalBounds());
102    canvas->FillRect(local_bounds, kTrackHoverColor);
103    canvas->DrawRect(local_bounds, kBorderColor);
104  }
105}
106
107}  // namespace views
108