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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "WheelScrollAnimation.h"
#include "AsyncPanZoomController.h"
#include "gfxPrefs.h"
#include "nsPoint.h"
namespace mozilla {
namespace layers {
WheelScrollAnimation::WheelScrollAnimation(AsyncPanZoomController& aApzc,
const nsPoint& aInitialPosition,
ScrollWheelInput::ScrollDeltaType aDeltaType)
: AsyncScrollBase(aInitialPosition)
, mApzc(aApzc)
, mFinalDestination(aInitialPosition)
, mDeltaType(aDeltaType)
{
}
void
WheelScrollAnimation::Update(TimeStamp aTime, nsPoint aDelta, const nsSize& aCurrentVelocity)
{
InitPreferences(aTime);
mFinalDestination += aDelta;
// Clamp the final destination to the scrollable area.
CSSPoint clamped = CSSPoint::FromAppUnits(mFinalDestination);
clamped.x = mApzc.mX.ClampOriginToScrollableRect(clamped.x);
clamped.y = mApzc.mY.ClampOriginToScrollableRect(clamped.y);
mFinalDestination = CSSPoint::ToAppUnits(clamped);
AsyncScrollBase::Update(aTime, mFinalDestination, aCurrentVelocity);
}
bool
WheelScrollAnimation::DoSample(FrameMetrics& aFrameMetrics, const TimeDuration& aDelta)
{
TimeStamp now = mApzc.GetFrameTime();
CSSToParentLayerScale2D zoom = aFrameMetrics.GetZoom();
// If the animation is finished, make sure the final position is correct by
// using one last displacement. Otherwise, compute the delta via the timing
// function as normal.
bool finished = IsFinished(now);
nsPoint sampledDest = finished
? mDestination
: PositionAt(now);
ParentLayerPoint displacement =
(CSSPoint::FromAppUnits(sampledDest) - aFrameMetrics.GetScrollOffset()) * zoom;
if (finished) {
mApzc.mX.SetVelocity(0);
mApzc.mY.SetVelocity(0);
} else if (!IsZero(displacement)) {
// Velocity is measured in ParentLayerCoords / Milliseconds
float xVelocity = displacement.x / aDelta.ToMilliseconds();
float yVelocity = displacement.y / aDelta.ToMilliseconds();
mApzc.mX.SetVelocity(xVelocity);
mApzc.mY.SetVelocity(yVelocity);
}
// Note: we ignore overscroll for wheel animations.
ParentLayerPoint adjustedOffset, overscroll;
mApzc.mX.AdjustDisplacement(displacement.x, adjustedOffset.x, overscroll.x);
mApzc.mY.AdjustDisplacement(displacement.y, adjustedOffset.y, overscroll.y,
!mApzc.mScrollMetadata.AllowVerticalScrollWithWheel());
// If we expected to scroll, but there's no more scroll range on either axis,
// then end the animation early. Note that the initial displacement could be 0
// if the compositor ran very quickly (<1ms) after the animation was created.
// When that happens we want to make sure the animation continues.
if (!IsZero(displacement) && IsZero(adjustedOffset)) {
// Nothing more to do - end the animation.
return false;
}
aFrameMetrics.ScrollBy(adjustedOffset / zoom);
return !finished;
}
void
WheelScrollAnimation::InitPreferences(TimeStamp aTime)
{
if (!mIsFirstIteration) {
return;
}
switch (mDeltaType) {
case ScrollWheelInput::SCROLLDELTA_PAGE:
mOriginMaxMS = clamped(gfxPrefs::PageSmoothScrollMaxDurationMs(), 0, 10000);
mOriginMinMS = clamped(gfxPrefs::PageSmoothScrollMinDurationMs(), 0, mOriginMaxMS);
break;
case ScrollWheelInput::SCROLLDELTA_PIXEL:
mOriginMaxMS = clamped(gfxPrefs::PixelSmoothScrollMaxDurationMs(), 0, 10000);
mOriginMinMS = clamped(gfxPrefs::PixelSmoothScrollMinDurationMs(), 0, mOriginMaxMS);
break;
case ScrollWheelInput::SCROLLDELTA_LINE:
default:
mOriginMaxMS = clamped(gfxPrefs::WheelSmoothScrollMaxDurationMs(), 0, 10000);
mOriginMinMS = clamped(gfxPrefs::WheelSmoothScrollMinDurationMs(), 0, mOriginMaxMS);
break;
}
// The pref is 100-based int percentage, while mIntervalRatio is 1-based ratio
mIntervalRatio = ((double)gfxPrefs::SmoothScrollDurationToIntervalRatio()) / 100.0;
mIntervalRatio = std::max(1.0, mIntervalRatio);
InitializeHistory(aTime);
}
} // namespace layers
} // namespace mozilla
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