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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/views/controls/slide_out_view.h"
#include "ui/compositor/layer.h"
#include "ui/compositor/scoped_layer_animation_settings.h"
#include "ui/gfx/transform.h"
namespace views {
SlideOutView::SlideOutView() {
// If accelerated compositing is not available, this widget tracks the
// OnSlideOut event but does not render any visible changes.
SetPaintToLayer(true);
layer()->SetFillsBoundsOpaquely(false);
}
SlideOutView::~SlideOutView() {
}
void SlideOutView::OnGestureEvent(ui::GestureEvent* event) {
const float kScrollRatioForClosingNotification = 0.5f;
if (event->type() == ui::ET_SCROLL_FLING_START) {
// The threshold for the fling velocity is computed empirically.
// The unit is in pixels/second.
const float kFlingThresholdForClose = 800.f;
if (is_slide_out_enabled_ &&
fabsf(event->details().velocity_x()) > kFlingThresholdForClose) {
SlideOutAndClose(event->details().velocity_x() < 0 ? SLIDE_LEFT :
SLIDE_RIGHT);
event->StopPropagation();
return;
}
RestoreVisualState();
return;
}
if (!event->IsScrollGestureEvent())
return;
if (event->type() == ui::ET_GESTURE_SCROLL_BEGIN) {
gesture_amount_ = 0.f;
} else if (event->type() == ui::ET_GESTURE_SCROLL_UPDATE) {
// The scroll-update events include the incremental scroll amount.
gesture_amount_ += event->details().scroll_x();
float scroll_amount;
if (is_slide_out_enabled_) {
scroll_amount = gesture_amount_;
layer()->SetOpacity(1.f - std::min(fabsf(scroll_amount) / width(), 1.f));
} else {
if (gesture_amount_ >= 0) {
scroll_amount = std::min(0.5f * gesture_amount_,
width() * kScrollRatioForClosingNotification);
} else {
scroll_amount =
std::max(0.5f * gesture_amount_,
-1.f * width() * kScrollRatioForClosingNotification);
}
}
gfx::Transform transform;
transform.Translate(scroll_amount, 0.0);
layer()->SetTransform(transform);
} else if (event->type() == ui::ET_GESTURE_SCROLL_END) {
float scrolled_ratio = fabsf(gesture_amount_) / width();
if (is_slide_out_enabled_ &&
scrolled_ratio >= kScrollRatioForClosingNotification) {
SlideOutAndClose(gesture_amount_ < 0 ? SLIDE_LEFT : SLIDE_RIGHT);
event->StopPropagation();
return;
}
RestoreVisualState();
}
event->SetHandled();
}
void SlideOutView::RestoreVisualState() {
// Restore the layer state.
const int kSwipeRestoreDurationMS = 150;
ui::ScopedLayerAnimationSettings settings(layer()->GetAnimator());
settings.SetTransitionDuration(
base::TimeDelta::FromMilliseconds(kSwipeRestoreDurationMS));
layer()->SetTransform(gfx::Transform());
layer()->SetOpacity(1.f);
}
void SlideOutView::SlideOutAndClose(SlideDirection direction) {
const int kSwipeOutTotalDurationMS = 150;
int swipe_out_duration = kSwipeOutTotalDurationMS * layer()->opacity();
ui::ScopedLayerAnimationSettings settings(layer()->GetAnimator());
settings.SetTransitionDuration(
base::TimeDelta::FromMilliseconds(swipe_out_duration));
settings.AddObserver(this);
gfx::Transform transform;
transform.Translate(direction == SLIDE_LEFT ? -width() : width(), 0.0);
layer()->SetTransform(transform);
layer()->SetOpacity(0.f);
}
void SlideOutView::OnImplicitAnimationsCompleted() {
OnSlideOut();
}
} // namespace views
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