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| 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/slide_out_view.h" | |
| 6 | |
| 7 #include "ui/compositor/layer.h" | |
| 8 #include "ui/compositor/scoped_layer_animation_settings.h" | |
| 9 #include "ui/gfx/transform.h" | |
| 10 | |
| 11 namespace views { | |
| 12 | |
| 13 SlideOutView::SlideOutView() | |
| 14 : gesture_scroll_amount_(0.f) { | |
| 15 // If accelerated compositing is not available, this widget tracks the | |
| 16 // OnSlideOut event but does not render any visible changes. | |
| 17 SetPaintToLayer(true); | |
| 18 SetFillsBoundsOpaquely(false); | |
| 19 } | |
| 20 | |
| 21 SlideOutView::~SlideOutView() { | |
| 22 } | |
| 23 | |
| 24 void SlideOutView::OnGestureEvent(ui::GestureEvent* event) { | |
| 25 if (event->type() == ui::ET_SCROLL_FLING_START) { | |
| 26 // The threshold for the fling velocity is computed empirically. | |
| 27 // The unit is in pixels/second. | |
| 28 const float kFlingThresholdForClose = 800.f; | |
| 29 if (fabsf(event->details().velocity_x()) > kFlingThresholdForClose) { | |
| 30 SlideOutAndClose(event->details().velocity_x() < 0 ? SLIDE_LEFT : | |
| 31 SLIDE_RIGHT); | |
| 32 event->StopPropagation(); | |
| 33 return; | |
| 34 } | |
| 35 RestoreVisualState(); | |
| 36 return; | |
| 37 } | |
| 38 | |
| 39 if (!event->IsScrollGestureEvent()) | |
| 40 return; | |
| 41 | |
| 42 if (event->type() == ui::ET_GESTURE_SCROLL_BEGIN) { | |
| 43 gesture_scroll_amount_ = 0.f; | |
| 44 } else if (event->type() == ui::ET_GESTURE_SCROLL_UPDATE) { | |
| 45 // The scroll-update events include the incremental scroll amount. | |
| 46 gesture_scroll_amount_ += event->details().scroll_x(); | |
| 47 | |
| 48 gfx::Transform transform; | |
| 49 transform.Translate(gesture_scroll_amount_, 0.0); | |
| 50 layer()->SetTransform(transform); | |
| 51 layer()->SetOpacity( | |
| 52 1.f - std::min(fabsf(gesture_scroll_amount_) / width(), 1.f)); | |
| 53 | |
| 54 } else if (event->type() == ui::ET_GESTURE_SCROLL_END) { | |
| 55 const float kScrollRatioForClosingNotification = 0.5f; | |
| 56 float scrolled_ratio = fabsf(gesture_scroll_amount_) / width(); | |
| 57 if (scrolled_ratio >= kScrollRatioForClosingNotification) { | |
| 58 SlideOutAndClose(gesture_scroll_amount_ < 0 ? SLIDE_LEFT : SLIDE_RIGHT); | |
| 59 event->StopPropagation(); | |
| 60 return; | |
| 61 } | |
| 62 RestoreVisualState(); | |
| 63 } | |
| 64 | |
| 65 event->SetHandled(); | |
| 66 } | |
| 67 | |
| 68 void SlideOutView::RestoreVisualState() { | |
| 69 // Restore the layer state. | |
| 70 const int kSwipeRestoreDurationMS = 150; | |
| 71 ui::ScopedLayerAnimationSettings settings(layer()->GetAnimator()); | |
| 72 settings.SetTransitionDuration( | |
| 73 base::TimeDelta::FromMilliseconds(kSwipeRestoreDurationMS)); | |
| 74 layer()->SetTransform(gfx::Transform()); | |
| 75 layer()->SetOpacity(1.f); | |
| 76 } | |
| 77 | |
| 78 void SlideOutView::SlideOutAndClose(SlideDirection direction) { | |
| 79 const int kSwipeOutTotalDurationMS = 150; | |
| 80 int swipe_out_duration = kSwipeOutTotalDurationMS * layer()->opacity(); | |
| 81 ui::ScopedLayerAnimationSettings settings(layer()->GetAnimator()); | |
| 82 settings.SetTransitionDuration( | |
| 83 base::TimeDelta::FromMilliseconds(swipe_out_duration)); | |
| 84 settings.AddObserver(this); | |
| 85 | |
| 86 gfx::Transform transform; | |
| 87 transform.Translate(direction == SLIDE_LEFT ? -width() : width(), 0.0); | |
| 88 layer()->SetTransform(transform); | |
| 89 layer()->SetOpacity(0.f); | |
| 90 } | |
| 91 | |
| 92 void SlideOutView::OnImplicitAnimationsCompleted() { | |
| 93 OnSlideOut(); | |
| 94 } | |
| 95 | |
| 96 } // namespace views | |
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