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// Copyright 2016 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 "third_party/blink/renderer/core/page/scrolling/overscroll_controller.h"
#include "third_party/blink/renderer/core/frame/visual_viewport.h"
#include "third_party/blink/renderer/core/page/chrome_client.h"
#include "third_party/blink/renderer/core/scroll/scroll_types.h"
#include "third_party/blink/renderer/core/style/computed_style_base_constants.h"
#include "third_party/blink/renderer/platform/geometry/float_point.h"
#include "third_party/blink/renderer/platform/geometry/float_size.h"
#include "third_party/blink/renderer/platform/graphics/paint/scroll_paint_property_node.h"
namespace blink {
namespace {
// Report Overscroll if OverscrollDelta is greater than minimumOverscrollDelta
// to maintain consistency as done in the compositor.
const float kMinimumOverscrollDelta = 0.1;
void AdjustOverscroll(gfx::Vector2dF* unused_delta) {
DCHECK(unused_delta);
if (std::abs(unused_delta->x()) < kMinimumOverscrollDelta)
unused_delta->set_x(0);
if (std::abs(unused_delta->y()) < kMinimumOverscrollDelta)
unused_delta->set_y(0);
}
} // namespace
OverscrollController::OverscrollController(
const VisualViewport& visual_viewport,
ChromeClient& chrome_client)
: visual_viewport_(&visual_viewport), chrome_client_(&chrome_client) {}
void OverscrollController::Trace(Visitor* visitor) const {
visitor->Trace(visual_viewport_);
visitor->Trace(chrome_client_);
}
void OverscrollController::ResetAccumulated(bool reset_x, bool reset_y) {
if (reset_x)
accumulated_root_overscroll_.set_x(0);
if (reset_y)
accumulated_root_overscroll_.set_y(0);
}
void OverscrollController::HandleOverscroll(
const ScrollResult& scroll_result,
const FloatPoint& position_in_root_frame,
const FloatSize& velocity_in_root_frame) {
DCHECK(visual_viewport_);
DCHECK(chrome_client_);
gfx::Vector2dF unused_delta(scroll_result.unused_scroll_delta_x,
scroll_result.unused_scroll_delta_y);
AdjustOverscroll(&unused_delta);
gfx::Vector2dF delta_in_viewport =
gfx::ScaleVector2d(unused_delta, visual_viewport_->Scale());
gfx::Vector2dF velocity_in_viewport = gfx::ScaleVector2d(
gfx::Vector2dF(velocity_in_root_frame), visual_viewport_->Scale());
gfx::PointF position_in_viewport =
visual_viewport_->RootFrameToViewport(position_in_root_frame);
ResetAccumulated(scroll_result.did_scroll_x, scroll_result.did_scroll_y);
if (!delta_in_viewport.IsZero()) {
accumulated_root_overscroll_ += delta_in_viewport;
chrome_client_->DidOverscroll(delta_in_viewport,
accumulated_root_overscroll_,
position_in_viewport, velocity_in_viewport);
}
}
} // namespace blink
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