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 14 namespace views { 15 namespace { 16 17 const int kScrollbarWidth = 10; 18 const int kThumbMinimumSize = kScrollbarWidth * 2; 19 const SkColor kBorderColor = SkColorSetARGB(32, 0, 0, 0); 20 const SkColor kThumbHoverColor = SkColorSetARGB(128, 0, 0, 0); 21 const SkColor kThumbDefaultColor = SkColorSetARGB(64, 0, 0, 0); 22 const SkColor kTrackHoverColor = SkColorSetARGB(32, 0, 0, 0); 23 24 class 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() OVERRIDE; 32 virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE; 33 34 private: 35 DISALLOW_COPY_AND_ASSIGN(KennedyScrollBarThumb); 36 }; 37 38 KennedyScrollBarThumb::KennedyScrollBarThumb(BaseScrollBar* scroll_bar) 39 : BaseScrollBarThumb(scroll_bar) { 40 } 41 42 KennedyScrollBarThumb::~KennedyScrollBarThumb() { 43 } 44 45 gfx::Size KennedyScrollBarThumb::GetPreferredSize() { 46 return gfx::Size(kThumbMinimumSize, kThumbMinimumSize); 47 } 48 49 void 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 60 KennedyScrollBar::KennedyScrollBar(bool horizontal) 61 : BaseScrollBar(horizontal, new KennedyScrollBarThumb(this)) { 62 set_notify_enter_exit_on_child(true); 63 } 64 65 KennedyScrollBar::~KennedyScrollBar() { 66 } 67 68 gfx::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 76 int KennedyScrollBar::GetLayoutSize() const { 77 return kScrollbarWidth; 78 } 79 80 gfx::Size KennedyScrollBar::GetPreferredSize() { 81 return GetTrackBounds().size(); 82 } 83 84 void 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 97 void 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