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| 1 // Copyright 2014 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 "athena/util/drag_handle.h" | |
| 6 | |
| 7 #include "ui/views/background.h" | |
| 8 #include "ui/views/view.h" | |
| 9 | |
| 10 namespace athena { | |
| 11 namespace { | |
| 12 | |
| 13 const SkColor kDragHandleColorNormal = SK_ColorGRAY; | |
| 14 const SkColor kDragHandleColorHot = SK_ColorWHITE; | |
| 15 | |
| 16 // This view notifies its delegate of the touch scroll gestures performed on it. | |
| 17 class DragHandleView : public views::View { | |
| 18 public: | |
| 19 DragHandleView(DragHandleScrollDirection scroll_direction, | |
| 20 DragHandleScrollDelegate* delegate, | |
| 21 int preferred_width, | |
| 22 int preferred_height); | |
| 23 ~DragHandleView() override; | |
| 24 | |
| 25 private: | |
| 26 void SetColor(SkColor color); | |
| 27 | |
| 28 void SetIsScrolling(bool scrolling); | |
| 29 | |
| 30 // views::View: | |
| 31 virtual gfx::Size GetPreferredSize() const override; | |
| 32 virtual void OnGestureEvent(ui::GestureEvent* event) override; | |
| 33 | |
| 34 bool scroll_in_progress_; | |
| 35 DragHandleScrollDelegate* delegate_; | |
| 36 DragHandleScrollDirection scroll_direction_; | |
| 37 SkColor color_; | |
| 38 float scroll_start_location_; | |
| 39 const int preferred_width_; | |
| 40 const int preferred_height_; | |
| 41 | |
| 42 DISALLOW_COPY_AND_ASSIGN(DragHandleView); | |
| 43 }; | |
| 44 | |
| 45 DragHandleView::DragHandleView(DragHandleScrollDirection scroll_direction, | |
| 46 DragHandleScrollDelegate* delegate, | |
| 47 int preferred_width, | |
| 48 int preferred_height) | |
| 49 : scroll_in_progress_(false), | |
| 50 delegate_(delegate), | |
| 51 scroll_direction_(scroll_direction), | |
| 52 color_(SK_ColorTRANSPARENT), | |
| 53 preferred_width_(preferred_width), | |
| 54 preferred_height_(preferred_height) { | |
| 55 SetColor(kDragHandleColorNormal); | |
| 56 } | |
| 57 | |
| 58 DragHandleView::~DragHandleView() { | |
| 59 } | |
| 60 | |
| 61 void DragHandleView::SetColor(SkColor color) { | |
| 62 if (color_ == color) | |
| 63 return; | |
| 64 color_ = color; | |
| 65 set_background(views::Background::CreateSolidBackground(color_)); | |
| 66 SchedulePaint(); | |
| 67 } | |
| 68 | |
| 69 void DragHandleView::SetIsScrolling(bool scrolling) { | |
| 70 if (scroll_in_progress_ == scrolling) | |
| 71 return; | |
| 72 scroll_in_progress_ = scrolling; | |
| 73 if (!scroll_in_progress_) | |
| 74 scroll_start_location_ = 0; | |
| 75 } | |
| 76 | |
| 77 // views::View: | |
| 78 gfx::Size DragHandleView::GetPreferredSize() const { | |
| 79 return gfx::Size(preferred_width_, preferred_height_); | |
| 80 } | |
| 81 | |
| 82 void DragHandleView::OnGestureEvent(ui::GestureEvent* event) { | |
| 83 SkColor change_color = SK_ColorTRANSPARENT; | |
| 84 if (event->type() == ui::ET_GESTURE_BEGIN && | |
| 85 event->details().touch_points() == 1) { | |
| 86 change_color = kDragHandleColorHot; | |
| 87 } else if (event->type() == ui::ET_GESTURE_END && | |
| 88 event->details().touch_points() == 1) { | |
| 89 change_color = kDragHandleColorNormal; | |
| 90 } | |
| 91 | |
| 92 if (change_color != SK_ColorTRANSPARENT) { | |
| 93 SetColor(change_color); | |
| 94 event->SetHandled(); | |
| 95 return; | |
| 96 } | |
| 97 | |
| 98 if (event->type() == ui::ET_GESTURE_SCROLL_BEGIN) { | |
| 99 if (scroll_in_progress_) | |
| 100 return; | |
| 101 float delta; | |
| 102 if (scroll_direction_ == DRAG_HANDLE_VERTICAL) { | |
| 103 delta = event->details().scroll_y_hint(); | |
| 104 scroll_start_location_ = event->root_location().y(); | |
| 105 } else { | |
| 106 delta = event->details().scroll_x_hint(); | |
| 107 scroll_start_location_ = event->root_location().x(); | |
| 108 } | |
| 109 delegate_->HandleScrollBegin(delta); | |
| 110 SetIsScrolling(true); | |
| 111 event->SetHandled(); | |
| 112 } else if (event->type() == ui::ET_GESTURE_SCROLL_END || | |
| 113 event->type() == ui::ET_SCROLL_FLING_START) { | |
| 114 if (!scroll_in_progress_) | |
| 115 return; | |
| 116 float velocity = 0.0f; | |
| 117 if (event->type() == ui::ET_SCROLL_FLING_START) | |
| 118 velocity = event->details().velocity_x(); | |
| 119 delegate_->HandleScrollEnd(velocity); | |
| 120 SetColor(kDragHandleColorNormal); | |
| 121 SetIsScrolling(false); | |
| 122 event->SetHandled(); | |
| 123 } else if (event->type() == ui::ET_GESTURE_SCROLL_UPDATE) { | |
| 124 if (!scroll_in_progress_) | |
| 125 return; | |
| 126 float delta = scroll_direction_ == DRAG_HANDLE_VERTICAL | |
| 127 ? event->root_location().y() - scroll_start_location_ | |
| 128 : event->root_location().x() - scroll_start_location_; | |
| 129 delegate_->HandleScrollUpdate(delta); | |
| 130 event->SetHandled(); | |
| 131 } | |
| 132 } | |
| 133 | |
| 134 } // namespace | |
| 135 | |
| 136 views::View* CreateDragHandleView(DragHandleScrollDirection scroll_direction, | |
| 137 DragHandleScrollDelegate* delegate, | |
| 138 int preferred_width, | |
| 139 int preferred_height) { | |
| 140 views::View* view = new DragHandleView( | |
| 141 scroll_direction, delegate, preferred_width, preferred_height); | |
| 142 return view; | |
| 143 } | |
| 144 | |
| 145 } // namespace athena | |
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Chromium Code Reviews
Issue 863033002:
Delete athena/ (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master