ViewGestureControllerMac.mm [plain text]
/*
* Copyright (C) 2013, 2014 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#import "config.h"
#import "ViewGestureController.h"
#if PLATFORM(MAC)
#import "APINavigation.h"
#import "DrawingAreaProxy.h"
#import "FrameLoadState.h"
#import "Logging.h"
#import "NativeWebWheelEvent.h"
#import "ProvisionalPageProxy.h"
#import "ViewGestureControllerMessages.h"
#import "ViewGestureGeometryCollectorMessages.h"
#import "ViewSnapshotStore.h"
#import "WebBackForwardList.h"
#import "WebPageGroup.h"
#import "WebPageMessages.h"
#import "WebPageProxy.h"
#import "WebPreferences.h"
#import "WebProcessProxy.h"
#import <Cocoa/Cocoa.h>
#import <WebCore/IOSurface.h>
#import <WebCore/NotImplemented.h>
#import <WebCore/WebActionDisablingCALayerDelegate.h>
#import <pal/spi/cocoa/QuartzCoreSPI.h>
#import <pal/spi/mac/NSEventSPI.h>
static const double minMagnification = 1;
static const double maxMagnification = 3;
static const double minElasticMagnification = 0.75;
static const double maxElasticMagnification = 4;
static const double zoomOutBoost = 1.6;
static const double zoomOutResistance = 0.10;
static const float smartMagnificationElementPadding = 0.05;
static const float smartMagnificationPanScrollThreshold = 100;
static const double swipeOverlayShadowOpacity = 0.06;
static const double swipeOverlayDimmingOpacity = 0.12;
static const CGFloat swipeOverlayShadowWidth = 81;
@interface WKSwipeCancellationTracker : NSObject {
@private
BOOL _isCancelled;
}
@property (nonatomic) BOOL isCancelled;
@end
@implementation WKSwipeCancellationTracker
@synthesize isCancelled = _isCancelled;
@end
namespace WebKit {
using namespace WebCore;
void ViewGestureController::platformTeardown()
{
if (m_swipeCancellationTracker)
[m_swipeCancellationTracker setIsCancelled:YES];
if (m_activeGestureType == ViewGestureType::Swipe)
removeSwipeSnapshot();
}
static double resistanceForDelta(double deltaScale, double currentScale)
{
// Zoom out with slight acceleration, until we reach minimum scale.
if (deltaScale < 0 && currentScale > minMagnification)
return zoomOutBoost;
// Zoom in with no acceleration, until we reach maximum scale.
if (deltaScale > 0 && currentScale < maxMagnification)
return 1;
// Outside of the extremes, resist further scaling.
double limit = currentScale < minMagnification ? minMagnification : maxMagnification;
double scaleDistance = std::abs(limit - currentScale);
double scalePercent = std::min(std::max(scaleDistance / limit, 0.), 1.);
double resistance = zoomOutResistance + scalePercent * (0.01 - zoomOutResistance);
return resistance;
}
FloatPoint ViewGestureController::scaledMagnificationOrigin(FloatPoint origin, double scale)
{
FloatPoint scaledMagnificationOrigin(origin);
scaledMagnificationOrigin.moveBy(m_visibleContentRect.location());
float magnificationOriginScale = 1 - (scale / m_webPageProxy.pageScaleFactor());
scaledMagnificationOrigin.scale(magnificationOriginScale);
return scaledMagnificationOrigin;
}
void ViewGestureController::didCollectGeometryForMagnificationGesture(FloatRect visibleContentRect, bool frameHandlesMagnificationGesture)
{
willBeginGesture(ViewGestureType::Magnification);
m_visibleContentRect = visibleContentRect;
m_visibleContentRectIsValid = true;
m_frameHandlesMagnificationGesture = frameHandlesMagnificationGesture;
}
void ViewGestureController::gestureEventWasNotHandledByWebCore(NSEvent *event, FloatPoint origin)
{
if (event.type == NSEventTypeMagnify)
handleMagnificationGestureEvent(event, origin);
}
void ViewGestureController::handleMagnificationGestureEvent(NSEvent *event, FloatPoint origin)
{
origin.setY(origin.y() - m_webPageProxy.topContentInset());
ASSERT(m_activeGestureType == ViewGestureType::None || m_activeGestureType == ViewGestureType::Magnification);
if (m_activeGestureType == ViewGestureType::None) {
if (event.phase != NSEventPhaseBegan)
return;
// FIXME: We drop the first frame of the gesture on the floor, because we don't have the visible content bounds yet.
m_magnification = m_webPageProxy.pageScaleFactor();
m_webPageProxy.send(Messages::ViewGestureGeometryCollector::CollectGeometryForMagnificationGesture());
m_lastMagnificationGestureWasSmartMagnification = false;
return;
}
// We're still waiting for the DidCollectGeometry callback.
if (!m_visibleContentRectIsValid)
return;
willBeginGesture(ViewGestureType::Magnification);
double scale = event.magnification;
double scaleWithResistance = resistanceForDelta(scale, m_magnification) * scale;
m_magnification += m_magnification * scaleWithResistance;
m_magnification = std::min(std::max(m_magnification, minElasticMagnification), maxElasticMagnification);
m_magnificationOrigin = origin;
if (m_frameHandlesMagnificationGesture)
m_webPageProxy.scalePage(m_magnification, roundedIntPoint(origin));
else
m_webPageProxy.drawingArea()->adjustTransientZoom(m_magnification, scaledMagnificationOrigin(origin, m_magnification));
if (event.phase == NSEventPhaseEnded || event.phase == NSEventPhaseCancelled)
endMagnificationGesture();
}
void ViewGestureController::endMagnificationGesture()
{
if (m_activeGestureType != ViewGestureType::Magnification)
return;
double newMagnification = std::min(std::max(m_magnification, minMagnification), maxMagnification);
if (m_frameHandlesMagnificationGesture)
m_webPageProxy.scalePage(newMagnification, roundedIntPoint(m_magnificationOrigin));
else {
if (auto drawingArea = m_webPageProxy.drawingArea())
drawingArea->commitTransientZoom(newMagnification, scaledMagnificationOrigin(m_magnificationOrigin, newMagnification));
}
m_webPageProxy.didEndMagnificationGesture();
didEndGesture();
m_visibleContentRectIsValid = false;
}
void ViewGestureController::handleSmartMagnificationGesture(FloatPoint origin)
{
if (m_activeGestureType != ViewGestureType::None)
return;
m_webPageProxy.send(Messages::ViewGestureGeometryCollector::CollectGeometryForSmartMagnificationGesture(origin));
}
static float maximumRectangleComponentDelta(FloatRect a, FloatRect b)
{
return std::max(std::abs(a.x() - b.x()), std::max(std::abs(a.y() - b.y()), std::max(std::abs(a.width() - b.width()), std::abs(a.height() - b.height()))));
}
void ViewGestureController::didCollectGeometryForSmartMagnificationGesture(FloatPoint origin, FloatRect renderRect, FloatRect visibleContentRect, bool fitEntireRect, double viewportMinimumScale, double viewportMaximumScale)
{
double currentScaleFactor = m_webPageProxy.pageScaleFactor();
FloatRect unscaledTargetRect = renderRect;
// If there was no usable element under the cursor, we'll scale towards the cursor instead.
if (unscaledTargetRect.isEmpty())
unscaledTargetRect.setLocation(origin);
unscaledTargetRect.scale(1 / currentScaleFactor);
unscaledTargetRect.inflateX(unscaledTargetRect.width() * smartMagnificationElementPadding);
unscaledTargetRect.inflateY(unscaledTargetRect.height() * smartMagnificationElementPadding);
double targetMagnification = visibleContentRect.width() / unscaledTargetRect.width();
FloatRect unscaledVisibleContentRect = visibleContentRect;
unscaledVisibleContentRect.scale(1 / currentScaleFactor);
FloatRect viewportConstrainedUnscaledTargetRect = unscaledTargetRect;
viewportConstrainedUnscaledTargetRect.intersect(unscaledVisibleContentRect);
if (unscaledTargetRect.width() > viewportConstrainedUnscaledTargetRect.width())
viewportConstrainedUnscaledTargetRect.setX(unscaledVisibleContentRect.x() + (origin.x() / currentScaleFactor) - viewportConstrainedUnscaledTargetRect.width() / 2);
if (unscaledTargetRect.height() > viewportConstrainedUnscaledTargetRect.height())
viewportConstrainedUnscaledTargetRect.setY(unscaledVisibleContentRect.y() + (origin.y() / currentScaleFactor) - viewportConstrainedUnscaledTargetRect.height() / 2);
// For replaced elements like images, we want to fit the whole element
// in the view, so scale it down enough to make both dimensions fit if possible.
if (fitEntireRect)
targetMagnification = std::min(targetMagnification, static_cast<double>(visibleContentRect.height() / viewportConstrainedUnscaledTargetRect.height()));
targetMagnification = std::min(std::max(targetMagnification, minMagnification), maxMagnification);
// Allow panning between elements via double-tap while magnified, unless the target rect is
// similar to the last one or the mouse has not moved, in which case we'll zoom all the way out.
if (currentScaleFactor > 1 && m_lastMagnificationGestureWasSmartMagnification) {
if (maximumRectangleComponentDelta(m_lastSmartMagnificationUnscaledTargetRect, unscaledTargetRect) < smartMagnificationPanScrollThreshold)
targetMagnification = 1;
if (m_lastSmartMagnificationOrigin == origin)
targetMagnification = 1;
}
FloatRect targetRect(viewportConstrainedUnscaledTargetRect);
targetRect.scale(targetMagnification);
FloatPoint targetOrigin(visibleContentRect.center());
targetOrigin.moveBy(-targetRect.center());
m_webPageProxy.drawingArea()->adjustTransientZoom(m_webPageProxy.pageScaleFactor(), scaledMagnificationOrigin(FloatPoint(), m_webPageProxy.pageScaleFactor()));
m_webPageProxy.drawingArea()->commitTransientZoom(targetMagnification, targetOrigin);
m_lastSmartMagnificationUnscaledTargetRect = unscaledTargetRect;
m_lastSmartMagnificationOrigin = origin;
m_lastMagnificationGestureWasSmartMagnification = true;
}
bool ViewGestureController::PendingSwipeTracker::scrollEventCanStartSwipe(NSEvent *event)
{
return event.phase == NSEventPhaseBegan;
}
bool ViewGestureController::PendingSwipeTracker::scrollEventCanEndSwipe(NSEvent *event)
{
return event.phase == NSEventPhaseEnded;
}
bool ViewGestureController::PendingSwipeTracker::scrollEventCanInfluenceSwipe(NSEvent *event)
{
return event.hasPreciseScrollingDeltas && [NSEvent isSwipeTrackingFromScrollEventsEnabled];
}
FloatSize ViewGestureController::PendingSwipeTracker::scrollEventGetScrollingDeltas(NSEvent *event)
{
return FloatSize(event.scrollingDeltaX, event.scrollingDeltaY);
}
bool ViewGestureController::handleScrollWheelEvent(NSEvent *event)
{
if (m_activeGestureType != ViewGestureType::None)
return false;
return m_pendingSwipeTracker.handleEvent(event);
}
void ViewGestureController::trackSwipeGesture(PlatformScrollEvent event, SwipeDirection direction, RefPtr<WebBackForwardListItem> targetItem)
{
BOOL swipingLeft = isPhysicallySwipingLeft(direction);
CGFloat maxProgress = swipingLeft ? 1 : 0;
CGFloat minProgress = !swipingLeft ? -1 : 0;
__block bool swipeCancelled = false;
ASSERT(!m_swipeCancellationTracker);
RetainPtr<WKSwipeCancellationTracker> swipeCancellationTracker = adoptNS([[WKSwipeCancellationTracker alloc] init]);
m_swipeCancellationTracker = swipeCancellationTracker;
[event trackSwipeEventWithOptions:NSEventSwipeTrackingConsumeMouseEvents dampenAmountThresholdMin:minProgress max:maxProgress usingHandler:^(CGFloat progress, NSEventPhase phase, BOOL isComplete, BOOL *stop) {
if ([swipeCancellationTracker isCancelled]) {
*stop = YES;
return;
}
if (phase == NSEventPhaseBegan)
this->beginSwipeGesture(targetItem.get(), direction);
CGFloat clampedProgress = std::min(std::max(progress, minProgress), maxProgress);
this->handleSwipeGesture(targetItem.get(), clampedProgress, direction);
if (phase == NSEventPhaseCancelled)
swipeCancelled = true;
if (phase == NSEventPhaseEnded || phase == NSEventPhaseCancelled)
this->willEndSwipeGesture(*targetItem, swipeCancelled);
if (isComplete)
this->endSwipeGesture(targetItem.get(), swipeCancelled);
}];
}
FloatRect ViewGestureController::windowRelativeBoundsForCustomSwipeViews() const
{
FloatRect swipeArea;
for (const auto& view : m_customSwipeViews)
swipeArea.unite([view convertRect:[view bounds] toView:nil]);
swipeArea.setHeight(swipeArea.height() - m_customSwipeViewsTopContentInset);
return swipeArea;
}
static CALayer *leastCommonAncestorLayer(const Vector<RetainPtr<CALayer>>& layers)
{
Vector<Vector<CALayer *>> liveLayerPathsFromRoot(layers.size());
size_t shortestPathLength = std::numeric_limits<size_t>::max();
for (size_t layerIndex = 0; layerIndex < layers.size(); layerIndex++) {
CALayer *parent = [layers[layerIndex] superlayer];
while (parent) {
liveLayerPathsFromRoot[layerIndex].insert(0, parent);
shortestPathLength = std::min(shortestPathLength, liveLayerPathsFromRoot[layerIndex].size());
parent = parent.superlayer;
}
}
for (size_t pathIndex = 0; pathIndex < shortestPathLength; pathIndex++) {
CALayer *firstPathLayer = liveLayerPathsFromRoot[0][pathIndex];
for (size_t layerIndex = 1; layerIndex < layers.size(); layerIndex++) {
if (liveLayerPathsFromRoot[layerIndex][pathIndex] != firstPathLayer)
return firstPathLayer;
}
}
return liveLayerPathsFromRoot[0][shortestPathLength];
}
CALayer *ViewGestureController::determineSnapshotLayerParent() const
{
if (m_currentSwipeLiveLayers.size() == 1)
return [m_currentSwipeLiveLayers[0] superlayer];
// We insert our snapshot into the first shared superlayer of the custom views' layer, above the frontmost or below the bottommost layer.
return leastCommonAncestorLayer(m_currentSwipeLiveLayers);
}
CALayer *ViewGestureController::determineLayerAdjacentToSnapshotForParent(SwipeDirection direction, CALayer *snapshotLayerParent) const
{
// If we have custom swiping views, we assume that the views were passed to us in back-to-front z-order.
CALayer *layerAdjacentToSnapshot = isPhysicallySwipingLeft(direction) ? m_currentSwipeLiveLayers.first().get() : m_currentSwipeLiveLayers.last().get();
if (m_currentSwipeLiveLayers.size() == 1)
return layerAdjacentToSnapshot;
// If the layers are not all siblings, find the child of the layer we're going to insert the snapshot into which has the frontmost/bottommost layer as a child.
while (snapshotLayerParent != layerAdjacentToSnapshot.superlayer)
layerAdjacentToSnapshot = layerAdjacentToSnapshot.superlayer;
return layerAdjacentToSnapshot;
}
static bool layerGeometryFlippedToRoot(CALayer *layer)
{
bool flipped = false;
CALayer *parent = layer;
while (parent) {
if (parent.isGeometryFlipped)
flipped = !flipped;
parent = parent.superlayer;
}
return flipped;
}
void ViewGestureController::applyDebuggingPropertiesToSwipeViews()
{
CAFilter* filter = [CAFilter filterWithType:kCAFilterColorInvert];
[m_swipeLayer setFilters:@[ filter ]];
[m_swipeLayer setBackgroundColor:[NSColor blueColor].CGColor];
[m_swipeLayer setBorderColor:[NSColor yellowColor].CGColor];
[m_swipeLayer setBorderWidth:4];
[m_swipeSnapshotLayer setBackgroundColor:[NSColor greenColor].CGColor];
[m_swipeSnapshotLayer setBorderColor:[NSColor redColor].CGColor];
[m_swipeSnapshotLayer setBorderWidth:2];
}
void ViewGestureController::beginSwipeGesture(WebBackForwardListItem* targetItem, SwipeDirection direction)
{
ASSERT(m_currentSwipeLiveLayers.isEmpty());
m_webPageProxy.navigationGestureDidBegin();
willBeginGesture(ViewGestureType::Swipe);
CALayer *rootContentLayer = m_webPageProxy.acceleratedCompositingRootLayer();
m_swipeLayer = adoptNS([[CALayer alloc] init]);
m_swipeSnapshotLayer = adoptNS([[CALayer alloc] init]);
m_currentSwipeCustomViewBounds = windowRelativeBoundsForCustomSwipeViews();
FloatRect swipeArea;
float topContentInset = 0;
if (!m_customSwipeViews.isEmpty()) {
topContentInset = m_customSwipeViewsTopContentInset;
swipeArea = m_currentSwipeCustomViewBounds;
swipeArea.expand(0, topContentInset);
for (const auto& view : m_customSwipeViews) {
CALayer *layer = [view layer];
ASSERT(layer);
m_currentSwipeLiveLayers.append(layer);
}
} else {
swipeArea = [rootContentLayer convertRect:CGRectMake(0, 0, m_webPageProxy.viewSize().width(), m_webPageProxy.viewSize().height()) toLayer:nil];
topContentInset = m_webPageProxy.topContentInset();
m_currentSwipeLiveLayers.append(rootContentLayer);
}
CALayer *snapshotLayerParent = determineSnapshotLayerParent();
bool geometryIsFlippedToRoot = layerGeometryFlippedToRoot(snapshotLayerParent);
RetainPtr<CGColorRef> backgroundColor = CGColorGetConstantColor(kCGColorWhite);
if (ViewSnapshot* snapshot = targetItem->snapshot()) {
if (shouldUseSnapshotForSize(*snapshot, swipeArea.size(), topContentInset))
[m_swipeSnapshotLayer setContents:snapshot->asLayerContents()];
Color coreColor = snapshot->backgroundColor();
if (coreColor.isValid())
backgroundColor = cachedCGColor(coreColor);
m_currentSwipeSnapshot = snapshot;
}
[m_swipeLayer setBackgroundColor:backgroundColor.get()];
[m_swipeLayer setAnchorPoint:CGPointZero];
[m_swipeLayer setFrame:[snapshotLayerParent convertRect:swipeArea fromLayer:nil]];
[m_swipeLayer setName:@"Gesture Swipe Root Layer"];
[m_swipeLayer setGeometryFlipped:geometryIsFlippedToRoot];
[m_swipeLayer setDelegate:[WebActionDisablingCALayerDelegate shared]];
float deviceScaleFactor = m_webPageProxy.deviceScaleFactor();
[m_swipeSnapshotLayer setContentsGravity:kCAGravityTopLeft];
[m_swipeSnapshotLayer setContentsScale:deviceScaleFactor];
[m_swipeSnapshotLayer setAnchorPoint:CGPointZero];
[m_swipeSnapshotLayer setFrame:CGRectMake(0, 0, swipeArea.width(), swipeArea.height() - topContentInset)];
[m_swipeSnapshotLayer setName:@"Gesture Swipe Snapshot Layer"];
[m_swipeSnapshotLayer setDelegate:[WebActionDisablingCALayerDelegate shared]];
[m_swipeLayer addSublayer:m_swipeSnapshotLayer.get()];
if (m_webPageProxy.preferences().viewGestureDebuggingEnabled())
applyDebuggingPropertiesToSwipeViews();
m_didCallEndSwipeGesture = false;
m_removeSnapshotImmediatelyWhenGestureEnds = false;
CALayer *layerAdjacentToSnapshot = determineLayerAdjacentToSnapshotForParent(direction, snapshotLayerParent);
BOOL swipingLeft = isPhysicallySwipingLeft(direction);
if (swipingLeft)
[snapshotLayerParent insertSublayer:m_swipeLayer.get() below:layerAdjacentToSnapshot];
else
[snapshotLayerParent insertSublayer:m_swipeLayer.get() above:layerAdjacentToSnapshot];
// We don't know enough about the custom views' hierarchy to apply a shadow.
if (m_customSwipeViews.isEmpty()) {
FloatRect dimmingRect(FloatPoint(), m_webPageProxy.viewSize());
m_swipeDimmingLayer = adoptNS([[CALayer alloc] init]);
[m_swipeDimmingLayer setName:@"Gesture Swipe Dimming Layer"];
[m_swipeDimmingLayer setBackgroundColor:[NSColor blackColor].CGColor];
[m_swipeDimmingLayer setOpacity:swipeOverlayDimmingOpacity];
[m_swipeDimmingLayer setAnchorPoint:CGPointZero];
[m_swipeDimmingLayer setFrame:dimmingRect];
[m_swipeDimmingLayer setGeometryFlipped:geometryIsFlippedToRoot];
[m_swipeDimmingLayer setDelegate:[WebActionDisablingCALayerDelegate shared]];
FloatRect shadowRect(-swipeOverlayShadowWidth, topContentInset, swipeOverlayShadowWidth, m_webPageProxy.viewSize().height() - topContentInset);
m_swipeShadowLayer = adoptNS([[CAGradientLayer alloc] init]);
[m_swipeShadowLayer setName:@"Gesture Swipe Shadow Layer"];
[m_swipeShadowLayer setColors:@[
(__bridge id)adoptCF(CGColorCreateGenericGray(0, 1.)).get(),
(__bridge id)adoptCF(CGColorCreateGenericGray(0, 0.99)).get(),
(__bridge id)adoptCF(CGColorCreateGenericGray(0, 0.98)).get(),
(__bridge id)adoptCF(CGColorCreateGenericGray(0, 0.95)).get(),
(__bridge id)adoptCF(CGColorCreateGenericGray(0, 0.92)).get(),
(__bridge id)adoptCF(CGColorCreateGenericGray(0, 0.82)).get(),
(__bridge id)adoptCF(CGColorCreateGenericGray(0, 0.71)).get(),
(__bridge id)adoptCF(CGColorCreateGenericGray(0, 0.46)).get(),
(__bridge id)adoptCF(CGColorCreateGenericGray(0, 0.35)).get(),
(__bridge id)adoptCF(CGColorCreateGenericGray(0, 0.25)).get(),
(__bridge id)adoptCF(CGColorCreateGenericGray(0, 0.17)).get(),
(__bridge id)adoptCF(CGColorCreateGenericGray(0, 0.11)).get(),
(__bridge id)adoptCF(CGColorCreateGenericGray(0, 0.07)).get(),
(__bridge id)adoptCF(CGColorCreateGenericGray(0, 0.04)).get(),
(__bridge id)adoptCF(CGColorCreateGenericGray(0, 0.01)).get(),
(__bridge id)adoptCF(CGColorCreateGenericGray(0, 0.)).get(),
]];
[m_swipeShadowLayer setLocations:@[
@0,
@0.03125,
@0.0625,
@0.0938,
@0.125,
@0.1875,
@0.25,
@0.375,
@0.4375,
@0.5,
@0.5625,
@0.625,
@0.6875,
@0.75,
@0.875,
@1,
]];
[m_swipeShadowLayer setStartPoint:CGPointMake(1, 0)];
[m_swipeShadowLayer setEndPoint:CGPointMake(0, 0)];
[m_swipeShadowLayer setOpacity:swipeOverlayShadowOpacity];
[m_swipeShadowLayer setAnchorPoint:CGPointZero];
[m_swipeShadowLayer setFrame:shadowRect];
[m_swipeShadowLayer setGeometryFlipped:geometryIsFlippedToRoot];
[m_swipeShadowLayer setDelegate:[WebActionDisablingCALayerDelegate shared]];
if (swipingLeft)
[snapshotLayerParent insertSublayer:m_swipeDimmingLayer.get() above:m_swipeLayer.get()];
else
[snapshotLayerParent insertSublayer:m_swipeDimmingLayer.get() below:m_swipeLayer.get()];
[snapshotLayerParent insertSublayer:m_swipeShadowLayer.get() above:m_swipeLayer.get()];
}
}
void ViewGestureController::handleSwipeGesture(WebBackForwardListItem* targetItem, double progress, SwipeDirection direction)
{
ASSERT(m_activeGestureType == ViewGestureType::Swipe);
if (!m_webPageProxy.drawingArea())
return;
bool swipingLeft = isPhysicallySwipingLeft(direction);
double width;
if (!m_customSwipeViews.isEmpty())
width = m_currentSwipeCustomViewBounds.width();
else
width = m_webPageProxy.drawingArea()->size().width();
double swipingLayerOffset = floor(width * progress);
double dimmingProgress = swipingLeft ? 1 - progress : -progress;
dimmingProgress = std::min(1., std::max(dimmingProgress, 0.));
[m_swipeDimmingLayer setOpacity:dimmingProgress * swipeOverlayDimmingOpacity];
double absoluteProgress = std::abs(progress);
double remainingSwipeDistance = width - std::abs(absoluteProgress * width);
double shadowFadeDistance = [m_swipeShadowLayer bounds].size.width;
if (remainingSwipeDistance < shadowFadeDistance)
[m_swipeShadowLayer setOpacity:(remainingSwipeDistance / shadowFadeDistance) * swipeOverlayShadowOpacity];
else
[m_swipeShadowLayer setOpacity:swipeOverlayShadowOpacity];
[m_swipeShadowLayer setTransform:CATransform3DMakeTranslation((swipingLeft ? 0 : width) + swipingLayerOffset, 0, 0)];
if (swipingLeft) {
for (const auto& layer : m_currentSwipeLiveLayers)
[layer setTransform:CATransform3DMakeTranslation(swipingLayerOffset, 0, 0)];
} else {
[m_swipeLayer setTransform:CATransform3DMakeTranslation(width + swipingLayerOffset, 0, 0)];
didMoveSwipeSnapshotLayer();
}
}
void ViewGestureController::didMoveSwipeSnapshotLayer()
{
if (!m_didMoveSwipeSnapshotCallback)
return;
m_didMoveSwipeSnapshotCallback(m_webPageProxy.boundsOfLayerInLayerBackedWindowCoordinates(m_swipeLayer.get()));
}
void ViewGestureController::removeSwipeSnapshot()
{
m_snapshotRemovalTracker.reset();
m_hasOutstandingRepaintRequest = false;
if (m_activeGestureType != ViewGestureType::Swipe)
return;
if (!m_didCallEndSwipeGesture) {
m_removeSnapshotImmediatelyWhenGestureEnds = true;
return;
}
resetState();
}
void ViewGestureController::resetState()
{
if (m_currentSwipeSnapshot)
m_currentSwipeSnapshot->setVolatile(true);
m_currentSwipeSnapshot = nullptr;
if (m_swipeCancellationTracker)
[m_swipeCancellationTracker setIsCancelled:YES];
m_swipeCancellationTracker = nil;
for (const auto& layer : m_currentSwipeLiveLayers)
[layer setTransform:CATransform3DIdentity];
[m_swipeSnapshotLayer removeFromSuperlayer];
m_swipeSnapshotLayer = nullptr;
[m_swipeLayer removeFromSuperlayer];
m_swipeLayer = nullptr;
[m_swipeShadowLayer removeFromSuperlayer];
m_swipeShadowLayer = nullptr;
[m_swipeDimmingLayer removeFromSuperlayer];
m_swipeDimmingLayer = nullptr;
m_currentSwipeLiveLayers.clear();
m_webPageProxy.navigationGestureSnapshotWasRemoved();
m_backgroundColorForCurrentSnapshot = Color();
m_pendingNavigation = nullptr;
didEndGesture();
}
void ViewGestureController::reset()
{
removeSwipeSnapshot();
resetState();
}
double ViewGestureController::magnification() const
{
if (m_activeGestureType == ViewGestureType::Magnification)
return m_magnification;
return m_webPageProxy.pageScaleFactor();
}
bool ViewGestureController::beginSimulatedSwipeInDirectionForTesting(SwipeDirection)
{
notImplemented();
return false;
}
bool ViewGestureController::completeSimulatedSwipeInDirectionForTesting(SwipeDirection)
{
notImplemented();
return false;
}
} // namespace WebKit
#endif // PLATFORM(MAC)