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| 1 // Copyright 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/overlay_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 | |
| 14 namespace views { | |
| 15 namespace { | |
| 16 | |
| 17 const int kScrollbarWidth = 10; | |
| 18 const int kThumbInsetInside = 3; | |
| 19 const int kThumbInsetFromEdge = 1; | |
| 20 const int kThumbCornerRadius = 2; | |
| 21 const int kThumbMinimumSize = kScrollbarWidth; | |
| 22 const int kThumbHoverAlpha = 128; | |
| 23 const int kThumbDefaultAlpha = 64; | |
| 24 | |
| 25 class OverlayScrollBarThumb : public BaseScrollBarThumb, | |
| 26 public gfx::AnimationDelegate { | |
| 27 public: | |
| 28 explicit OverlayScrollBarThumb(BaseScrollBar* scroll_bar); | |
| 29 virtual ~OverlayScrollBarThumb(); | |
| 30 | |
| 31 protected: | |
| 32 // View overrides: | |
| 33 virtual gfx::Size GetPreferredSize() const override; | |
| 34 virtual void OnPaint(gfx::Canvas* canvas) override; | |
| 35 | |
| 36 // gfx::AnimationDelegate overrides: | |
| 37 virtual void AnimationProgressed(const gfx::Animation* animation) override; | |
| 38 | |
| 39 private: | |
| 40 double animation_opacity_; | |
| 41 DISALLOW_COPY_AND_ASSIGN(OverlayScrollBarThumb); | |
| 42 }; | |
| 43 | |
| 44 OverlayScrollBarThumb::OverlayScrollBarThumb(BaseScrollBar* scroll_bar) | |
| 45 : BaseScrollBarThumb(scroll_bar), | |
| 46 animation_opacity_(0.0) { | |
| 47 // This is necessary, otherwise the thumb will be rendered below the views if | |
| 48 // those views paint to their own layers. | |
| 49 SetPaintToLayer(true); | |
| 50 SetFillsBoundsOpaquely(false); | |
| 51 } | |
| 52 | |
| 53 OverlayScrollBarThumb::~OverlayScrollBarThumb() { | |
| 54 } | |
| 55 | |
| 56 gfx::Size OverlayScrollBarThumb::GetPreferredSize() const { | |
| 57 return gfx::Size(kThumbMinimumSize, kThumbMinimumSize); | |
| 58 } | |
| 59 | |
| 60 void OverlayScrollBarThumb::OnPaint(gfx::Canvas* canvas) { | |
| 61 gfx::Rect local_bounds(GetLocalBounds()); | |
| 62 SkPaint paint; | |
| 63 int alpha = kThumbDefaultAlpha * animation_opacity_; | |
| 64 if (GetState() == CustomButton::STATE_HOVERED) { | |
| 65 alpha = kThumbHoverAlpha * animation_opacity_; | |
| 66 } else if(GetState() == CustomButton::STATE_PRESSED) { | |
| 67 // If we are in pressed state, no need to worry about animation, | |
| 68 // just display the deeper color. | |
| 69 alpha = kThumbHoverAlpha; | |
| 70 } | |
| 71 | |
| 72 paint.setStyle(SkPaint::kFill_Style); | |
| 73 paint.setColor(SkColorSetARGB(alpha, 0, 0, 0)); | |
| 74 canvas->DrawRoundRect(local_bounds, kThumbCornerRadius, paint); | |
| 75 } | |
| 76 | |
| 77 void OverlayScrollBarThumb::AnimationProgressed( | |
| 78 const gfx::Animation* animation) { | |
| 79 animation_opacity_ = animation->GetCurrentValue(); | |
| 80 SchedulePaint(); | |
| 81 } | |
| 82 | |
| 83 } // namespace | |
| 84 | |
| 85 OverlayScrollBar::OverlayScrollBar(bool horizontal) | |
| 86 : BaseScrollBar(horizontal, new OverlayScrollBarThumb(this)), | |
| 87 animation_(static_cast<OverlayScrollBarThumb*>(GetThumb())) { | |
| 88 set_notify_enter_exit_on_child(true); | |
| 89 } | |
| 90 | |
| 91 OverlayScrollBar::~OverlayScrollBar() { | |
| 92 } | |
| 93 | |
| 94 gfx::Rect OverlayScrollBar::GetTrackBounds() const { | |
| 95 gfx::Rect local_bounds(GetLocalBounds()); | |
| 96 if (IsHorizontal()) { | |
| 97 local_bounds.Inset(kThumbInsetFromEdge, kThumbInsetInside, | |
| 98 kThumbInsetFromEdge, kThumbInsetFromEdge); | |
| 99 } else { | |
| 100 local_bounds.Inset(kThumbInsetInside, kThumbInsetFromEdge, | |
| 101 kThumbInsetFromEdge, kThumbInsetFromEdge); | |
| 102 } | |
| 103 gfx::Size track_size = local_bounds.size(); | |
| 104 track_size.SetToMax(GetThumb()->size()); | |
| 105 local_bounds.set_size(track_size); | |
| 106 return local_bounds; | |
| 107 } | |
| 108 | |
| 109 int OverlayScrollBar::GetLayoutSize() const { | |
| 110 return 0; | |
| 111 } | |
| 112 | |
| 113 int OverlayScrollBar::GetContentOverlapSize() const { | |
| 114 return kScrollbarWidth; | |
| 115 } | |
| 116 | |
| 117 void OverlayScrollBar::OnMouseEnteredScrollView(const ui::MouseEvent& event) { | |
| 118 animation_.Show(); | |
| 119 } | |
| 120 | |
| 121 void OverlayScrollBar::OnMouseExitedScrollView(const ui::MouseEvent& event) { | |
| 122 animation_.Hide(); | |
| 123 } | |
| 124 | |
| 125 void OverlayScrollBar::OnGestureEvent(ui::GestureEvent* event) { | |
| 126 switch (event->type()) { | |
| 127 case ui::ET_GESTURE_SCROLL_BEGIN: | |
| 128 animation_.Show(); | |
| 129 break; | |
| 130 case ui::ET_GESTURE_SCROLL_END: | |
| 131 case ui::ET_SCROLL_FLING_START: | |
| 132 case ui::ET_GESTURE_END: | |
| 133 animation_.Hide(); | |
| 134 break; | |
| 135 default: | |
| 136 break; | |
| 137 } | |
| 138 BaseScrollBar::OnGestureEvent(event); | |
| 139 } | |
| 140 | |
| 141 gfx::Size OverlayScrollBar::GetPreferredSize() const { | |
| 142 return gfx::Size(); | |
| 143 } | |
| 144 | |
| 145 void OverlayScrollBar::Layout() { | |
| 146 gfx::Rect thumb_bounds = GetTrackBounds(); | |
| 147 BaseScrollBarThumb* thumb = GetThumb(); | |
| 148 if (IsHorizontal()) { | |
| 149 thumb_bounds.set_x(thumb->x()); | |
| 150 thumb_bounds.set_width(thumb->width()); | |
| 151 } else { | |
| 152 thumb_bounds.set_y(thumb->y()); | |
| 153 thumb_bounds.set_height(thumb->height()); | |
| 154 } | |
| 155 thumb->SetBoundsRect(thumb_bounds); | |
| 156 } | |
| 157 | |
| 158 void OverlayScrollBar::OnPaint(gfx::Canvas* canvas) { | |
| 159 } | |
| 160 | |
| 161 } // namespace views | |
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