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/*
* Copyright (C) 2006-2016 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. ``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
* 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 "EventHandler.h"
#if PLATFORM(IOS_FAMILY)
#import "AXObjectCache.h"
#import "AutoscrollController.h"
#import "Chrome.h"
#import "ChromeClient.h"
#import "ContentChangeObserver.h"
#import "DataTransfer.h"
#import "DragState.h"
#import "FocusController.h"
#import "Frame.h"
#import "FrameView.h"
#import "KeyboardEvent.h"
#import "MouseEventWithHitTestResults.h"
#import "Page.h"
#import "Pasteboard.h"
#import "PlatformEventFactoryIOS.h"
#import "PlatformKeyboardEvent.h"
#import "RenderWidget.h"
#import "WAKView.h"
#import "WAKWindow.h"
#import "WebEvent.h"
#import <wtf/BlockObjCExceptions.h>
#import <wtf/NeverDestroyed.h>
#import <wtf/Noncopyable.h>
#import <wtf/SetForScope.h>
#if ENABLE(IOS_TOUCH_EVENTS)
#import <WebKitAdditions/EventHandlerIOSTouch.cpp>
#endif
namespace WebCore {
static RetainPtr<WebEvent>& currentEventSlot()
{
static NeverDestroyed<RetainPtr<WebEvent>> event;
return event;
}
WebEvent *EventHandler::currentEvent()
{
return currentEventSlot().get();
}
class CurrentEventScope {
WTF_MAKE_NONCOPYABLE(CurrentEventScope);
public:
CurrentEventScope(WebEvent *);
~CurrentEventScope();
private:
RetainPtr<WebEvent> m_savedCurrentEvent;
#ifndef NDEBUG
RetainPtr<WebEvent> m_event;
#endif
};
inline CurrentEventScope::CurrentEventScope(WebEvent *event)
: m_savedCurrentEvent(currentEventSlot())
#ifndef NDEBUG
, m_event(event)
#endif
{
currentEventSlot() = event;
}
inline CurrentEventScope::~CurrentEventScope()
{
ASSERT(currentEventSlot() == m_event);
currentEventSlot() = m_savedCurrentEvent;
}
bool EventHandler::wheelEvent(WebEvent *event)
{
Page* page = m_frame.page();
if (!page)
return false;
CurrentEventScope scope(event);
bool eventWasHandled = handleWheelEvent(PlatformEventFactory::createPlatformWheelEvent(event));
event.wasHandled = eventWasHandled;
return eventWasHandled;
}
#if ENABLE(IOS_TOUCH_EVENTS)
bool EventHandler::dispatchSimulatedTouchEvent(IntPoint location)
{
bool handled = handleTouchEvent(PlatformEventFactory::createPlatformSimulatedTouchEvent(PlatformEvent::TouchStart, location));
handled |= handleTouchEvent(PlatformEventFactory::createPlatformSimulatedTouchEvent(PlatformEvent::TouchEnd, location));
return handled;
}
void EventHandler::touchEvent(WebEvent *event)
{
CurrentEventScope scope(event);
event.wasHandled = handleTouchEvent(PlatformEventFactory::createPlatformTouchEvent(event));
}
#endif
bool EventHandler::tabsToAllFormControls(KeyboardEvent* event) const
{
Page* page = m_frame.page();
if (!page)
return false;
KeyboardUIMode keyboardUIMode = page->chrome().client().keyboardUIMode();
bool handlingOptionTab = event && isKeyboardOptionTab(*event);
// If tab-to-links is off, option-tab always highlights all controls.
if ((keyboardUIMode & KeyboardAccessTabsToLinks) == 0 && handlingOptionTab)
return true;
// If system preferences say to include all controls, we always include all controls.
if (keyboardUIMode & KeyboardAccessFull)
return true;
// Otherwise tab-to-links includes all controls, unless the sense is flipped via option-tab.
if (keyboardUIMode & KeyboardAccessTabsToLinks)
return !handlingOptionTab;
return handlingOptionTab;
}
bool EventHandler::keyEvent(WebEvent *event)
{
BEGIN_BLOCK_OBJC_EXCEPTIONS;
ASSERT(event.type == WebEventKeyDown || event.type == WebEventKeyUp);
CurrentEventScope scope(event);
bool eventWasHandled = keyEvent(PlatformEventFactory::createPlatformKeyboardEvent(event));
event.wasHandled = eventWasHandled;
return eventWasHandled;
END_BLOCK_OBJC_EXCEPTIONS;
return false;
}
void EventHandler::focusDocumentView()
{
Page* page = m_frame.page();
if (!page)
return;
if (auto frameView = makeRefPtr(m_frame.view())) {
if (NSView *documentView = frameView->documentView()) {
page->chrome().focusNSView(documentView);
// Check page() again because focusNSView can cause reentrancy.
if (!m_frame.page())
return;
}
}
RELEASE_ASSERT(page == m_frame.page());
page->focusController().setFocusedFrame(&m_frame);
}
bool EventHandler::passWidgetMouseDownEventToWidget(const MouseEventWithHitTestResults& event)
{
// Figure out which view to send the event to.
auto* target = event.targetNode() ? event.targetNode()->renderer() : nullptr;
if (!is<RenderWidget>(target))
return false;
// Double-click events don't exist in Cocoa. Since passWidgetMouseDownEventToWidget() will
// just pass currentEvent down to the widget, we don't want to call it for events that
// don't correspond to Cocoa events. The mousedown/ups will have already been passed on as
// part of the pressed/released handling.
return passMouseDownEventToWidget(downcast<RenderWidget>(*target).widget());
}
bool EventHandler::passWidgetMouseDownEventToWidget(RenderWidget* renderWidget)
{
return passMouseDownEventToWidget(renderWidget->widget());
}
static bool lastEventIsMouseUp()
{
// Many AppKit widgets run their own event loops and consume events while the mouse is down.
// When they finish, currentEvent is the mouseUp that they exited on. We need to update
// the WebCore state with this mouseUp, which we never saw. This method lets us detect
// that state. Handling this was critical when we used AppKit widgets for form elements.
// It's not clear in what cases this is helpful now -- it's possible it can be removed.
BEGIN_BLOCK_OBJC_EXCEPTIONS;
WebEvent *currentEventAfterHandlingMouseDown = [WAKWindow currentEvent];
return currentEventAfterHandlingMouseDown
&& EventHandler::currentEvent() != currentEventAfterHandlingMouseDown
&& currentEventAfterHandlingMouseDown.type == WebEventMouseUp
&& currentEventAfterHandlingMouseDown.timestamp >= EventHandler::currentEvent().timestamp;
END_BLOCK_OBJC_EXCEPTIONS;
return false;
}
bool EventHandler::passMouseDownEventToWidget(Widget* pWidget)
{
// FIXME: This function always returns true. It should be changed either to return
// false in some cases or the return value should be removed.
RefPtr<Widget> widget = pWidget;
if (!widget) {
LOG_ERROR("hit a RenderWidget without a corresponding Widget, means a frame is half-constructed");
return true;
}
// In WebKit2 we will never have a native widget. Just return early and let the regular event handler machinery take care of
// dispatching the event.
if (!widget->platformWidget())
return false;
BEGIN_BLOCK_OBJC_EXCEPTIONS;
NSView *nodeView = widget->platformWidget();
ASSERT(nodeView);
ASSERT([nodeView superview]);
NSView *view = [nodeView hitTest:[[nodeView superview] convertPoint:currentEvent().locationInWindow fromView:nil]];
if (!view) {
// We probably hit the border of a RenderWidget
return true;
}
Page* page = m_frame.page();
if (!page)
return true;
if (page->chrome().client().firstResponder() != view) {
// Normally [NSWindow sendEvent:] handles setting the first responder.
// But in our case, the event was sent to the view representing the entire web page.
if ([view acceptsFirstResponder] && [view needsPanelToBecomeKey])
page->chrome().client().makeFirstResponder(view);
}
// We need to "defer loading" while tracking the mouse, because tearing down the
// page while an AppKit control is tracking the mouse can cause a crash.
// FIXME: In theory, WebCore now tolerates tear-down while tracking the
// mouse. We should confirm that, and then remove the deferrsLoading
// hack entirely.
bool wasDeferringLoading = page->defersLoading();
if (!wasDeferringLoading)
page->setDefersLoading(true);
ASSERT(!m_sendingEventToSubview);
m_sendingEventToSubview = true;
{
WidgetHierarchyUpdatesSuspensionScope suspendWidgetHierarchyUpdates;
[view mouseDown:currentEvent()];
}
m_sendingEventToSubview = false;
if (!wasDeferringLoading)
page->setDefersLoading(false);
// Remember which view we sent the event to, so we can direct the release event properly.
m_mouseDownView = view;
m_mouseDownWasInSubframe = false;
// Many AppKit widgets run their own event loops and consume events while the mouse is down.
// When they finish, currentEvent is the mouseUp that they exited on. We need to update
// the EventHandler state with this mouseUp, which we never saw.
// If this event isn't a mouseUp, we assume that the mouseUp will be coming later. There
// is a hole here if the widget consumes both the mouseUp and subsequent events.
if (lastEventIsMouseUp())
m_mousePressed = false;
END_BLOCK_OBJC_EXCEPTIONS;
return true;
}
// Note that this does the same kind of check as [target isDescendantOf:superview].
// There are two differences: This is a lot slower because it has to walk the whole
// tree, and this works in cases where the target has already been deallocated.
static bool findViewInSubviews(NSView *superview, NSView *target)
{
BEGIN_BLOCK_OBJC_EXCEPTIONS;
NSEnumerator *e = [[superview subviews] objectEnumerator];
NSView *subview;
while ((subview = [e nextObject])) {
if (subview == target || findViewInSubviews(subview, target)) {
return true;
}
}
END_BLOCK_OBJC_EXCEPTIONS;
return false;
}
NSView *EventHandler::mouseDownViewIfStillGood()
{
// Since we have no way of tracking the lifetime of m_mouseDownView, we have to assume that
// it could be deallocated already. We search for it in our subview tree; if we don't find
// it, we set it to nil.
NSView *mouseDownView = m_mouseDownView;
if (!mouseDownView) {
return nil;
}
FrameView* topFrameView = m_frame.view();
NSView *topView = topFrameView ? topFrameView->platformWidget() : nil;
if (!topView || !findViewInSubviews(topView, mouseDownView)) {
m_mouseDownView = nil;
return nil;
}
return mouseDownView;
}
bool EventHandler::eventActivatedView(const PlatformMouseEvent&) const
{
return false;
}
bool EventHandler::eventLoopHandleMouseUp(const MouseEventWithHitTestResults&)
{
NSView *view = mouseDownViewIfStillGood();
if (!view)
return false;
if (!m_mouseDownWasInSubframe) {
ASSERT(!m_sendingEventToSubview);
m_sendingEventToSubview = true;
BEGIN_BLOCK_OBJC_EXCEPTIONS;
[view mouseUp:currentEvent()];
END_BLOCK_OBJC_EXCEPTIONS;
m_sendingEventToSubview = false;
}
return true;
}
bool EventHandler::passSubframeEventToSubframe(MouseEventWithHitTestResults& event, Frame* subframe, HitTestResult* hoveredNode)
{
BEGIN_BLOCK_OBJC_EXCEPTIONS;
WebEventType currentEventType = currentEvent().type;
switch (currentEventType) {
case WebEventMouseMoved: {
// Since we're passing in currentNSEvent() here, we can call
// handleMouseMoveEvent() directly, since the save/restore of
// currentNSEvent() that mouseMoved() does would have no effect.
ASSERT(!m_sendingEventToSubview);
m_sendingEventToSubview = true;
subframe->eventHandler().handleMouseMoveEvent(currentPlatformMouseEvent(), hoveredNode);
m_sendingEventToSubview = false;
return true;
}
case WebEventMouseDown: {
auto* node = event.targetNode();
if (!node)
return false;
auto* renderer = node->renderer();
if (!is<RenderWidget>(renderer))
return false;
auto* widget = downcast<RenderWidget>(*renderer).widget();
if (!widget || !widget->isFrameView())
return false;
if (!passWidgetMouseDownEventToWidget(downcast<RenderWidget>(renderer)))
return false;
m_mouseDownWasInSubframe = true;
return true;
}
case WebEventMouseUp: {
if (!m_mouseDownWasInSubframe)
return false;
ASSERT(!m_sendingEventToSubview);
m_sendingEventToSubview = true;
subframe->eventHandler().handleMouseReleaseEvent(currentPlatformMouseEvent());
m_sendingEventToSubview = false;
return true;
}
case WebEventKeyDown:
case WebEventKeyUp:
case WebEventScrollWheel:
case WebEventTouchBegin:
case WebEventTouchCancel:
case WebEventTouchChange:
case WebEventTouchEnd:
return false;
}
END_BLOCK_OBJC_EXCEPTIONS;
return false;
}
bool EventHandler::widgetDidHandleWheelEvent(const PlatformWheelEvent&, Widget& widget)
{
BEGIN_BLOCK_OBJC_EXCEPTIONS;
NSView* nodeView = widget.platformWidget();
if (!nodeView) {
// WK2 code path. No wheel events on iOS anyway.
return false;
}
if (currentEvent().type != WebEventScrollWheel || m_sendingEventToSubview)
return false;
ASSERT(nodeView);
ASSERT([nodeView superview]);
NSView *view = [nodeView hitTest:[[nodeView superview] convertPoint:currentEvent().locationInWindow fromView:nil]];
if (!view) {
// We probably hit the border of a RenderWidget
return false;
}
ASSERT(!m_sendingEventToSubview);
m_sendingEventToSubview = true;
[view scrollWheel:currentEvent()];
m_sendingEventToSubview = false;
return true;
END_BLOCK_OBJC_EXCEPTIONS;
return false;
}
void EventHandler::mouseDown(WebEvent *event)
{
FrameView* v = m_frame.view();
if (!v || m_sendingEventToSubview)
return;
BEGIN_BLOCK_OBJC_EXCEPTIONS;
// FIXME: Why is this here? EventHandler::handleMousePressEvent() calls it.
m_frame.loader().resetMultipleFormSubmissionProtection();
m_mouseDownView = nil;
CurrentEventScope scope(event);
event.wasHandled = handleMousePressEvent(currentPlatformMouseEvent());
END_BLOCK_OBJC_EXCEPTIONS;
}
void EventHandler::mouseUp(WebEvent *event)
{
FrameView* v = m_frame.view();
if (!v || m_sendingEventToSubview)
return;
BEGIN_BLOCK_OBJC_EXCEPTIONS;
CurrentEventScope scope(event);
event.wasHandled = handleMouseReleaseEvent(currentPlatformMouseEvent());
m_mouseDownView = nil;
END_BLOCK_OBJC_EXCEPTIONS;
}
void EventHandler::mouseMoved(WebEvent *event)
{
// Reject a mouse moved if the button is down - screws up tracking during autoscroll
// These happen because WebKit sometimes has to fake up moved events.
if (!m_frame.document() || !m_frame.view() || m_mousePressed || m_sendingEventToSubview)
return;
BEGIN_BLOCK_OBJC_EXCEPTIONS;
auto& document = *m_frame.document();
// Ensure we start mouse move event dispatching on a clear tree.
document.updateStyleIfNeeded();
CurrentEventScope scope(event);
{
ContentChangeObserver::MouseMovedScope observingScope(document);
event.wasHandled = mouseMoved(currentPlatformMouseEvent());
// Run style recalc to be able to capture content changes as the result of the mouse move event.
document.updateStyleIfNeeded();
callOnMainThread([protectedFrame = makeRef(m_frame)] {
// This is called by WebKitLegacy only.
if (auto* document = protectedFrame->document())
document->contentChangeObserver().willNotProceedWithFixedObservationTimeWindow();
});
}
END_BLOCK_OBJC_EXCEPTIONS;
}
static bool frameHasPlatformWidget(const Frame& frame)
{
if (FrameView* frameView = frame.view()) {
if (frameView->platformWidget())
return true;
}
return false;
}
void EventHandler::dispatchSyntheticMouseOut(const PlatformMouseEvent& platformMouseEvent)
{
updateMouseEventTargetNode(nullptr, platformMouseEvent, FireMouseOverOut::Yes);
}
void EventHandler::dispatchSyntheticMouseMove(const PlatformMouseEvent& platformMouseEvent)
{
mouseMoved(platformMouseEvent);
}
bool EventHandler::passMousePressEventToSubframe(MouseEventWithHitTestResults& mev, Frame* subframe)
{
// WebKit1 code path.
if (frameHasPlatformWidget(m_frame))
return passSubframeEventToSubframe(mev, subframe);
// WebKit2 code path.
subframe->eventHandler().handleMousePressEvent(mev.event());
return true;
}
bool EventHandler::passMouseMoveEventToSubframe(MouseEventWithHitTestResults& mev, Frame* subframe, HitTestResult* hoveredNode)
{
// WebKit1 code path.
if (frameHasPlatformWidget(m_frame))
return passSubframeEventToSubframe(mev, subframe, hoveredNode);
subframe->eventHandler().handleMouseMoveEvent(mev.event(), hoveredNode);
return true;
}
bool EventHandler::passMouseReleaseEventToSubframe(MouseEventWithHitTestResults& mev, Frame* subframe)
{
// WebKit1 code path.
if (frameHasPlatformWidget(m_frame))
return passSubframeEventToSubframe(mev, subframe);
// WebKit2 code path.
subframe->eventHandler().handleMouseReleaseEvent(mev.event());
return true;
}
OptionSet<PlatformEvent::Modifier> EventHandler::accessKeyModifiers()
{
// Control+Option key combinations are usually unused on Mac OS X, but not when VoiceOver is enabled.
// So, we use Control in this case, even though it conflicts with Emacs-style key bindings.
// See <https://bugs.webkit.org/show_bug.cgi?id=21107> for more detail.
if (AXObjectCache::accessibilityEnhancedUserInterfaceEnabled())
return PlatformEvent::Modifier::ControlKey;
return { PlatformEvent::Modifier::ControlKey, PlatformEvent::Modifier::AltKey };
}
PlatformMouseEvent EventHandler::currentPlatformMouseEvent() const
{
return PlatformEventFactory::createPlatformMouseEvent(currentEvent());
}
void EventHandler::startSelectionAutoscroll(RenderObject* renderer, const FloatPoint& positionInWindow)
{
Ref<Frame> protectedFrame(m_frame);
m_targetAutoscrollPositionInUnscrolledRootViewCoordinates = protectedFrame->view()->contentsToRootView(roundedIntPoint(positionInWindow)) - toIntSize(protectedFrame->view()->documentScrollPositionRelativeToViewOrigin());
if (!m_isAutoscrolling)
m_initialTargetAutoscrollPositionInUnscrolledRootViewCoordinates = m_targetAutoscrollPositionInUnscrolledRootViewCoordinates;
m_isAutoscrolling = true;
m_autoscrollController->startAutoscrollForSelection(renderer);
}
void EventHandler::cancelSelectionAutoscroll()
{
m_isAutoscrolling = false;
m_initialTargetAutoscrollPositionInUnscrolledRootViewCoordinates = WTF::nullopt;
m_autoscrollController->stopAutoscrollTimer();
}
static IntPoint adjustAutoscrollDestinationForInsetEdges(IntPoint autoscrollPoint, Optional<IntPoint> initialAutoscrollPoint, FloatRect unobscuredRootViewRect)
{
IntPoint resultPoint = autoscrollPoint;
const float edgeInset = 75;
const float maximumScrollingSpeed = 20;
const float insetDistanceThreshold = edgeInset / 2;
// FIXME: Ideally we would only inset on edges that touch the edge of the screen,
// like macOS, but we don't have enough information in WebCore to do that currently.
FloatRect insetUnobscuredRootViewRect = unobscuredRootViewRect;
if (initialAutoscrollPoint) {
IntSize autoscrollDelta = autoscrollPoint - *initialAutoscrollPoint;
// Inset edges in the direction of the autoscroll.
// Do not apply insets until you drag in the direction of the edge at least `insetDistanceThreshold`,
// to make it possible to select text that abuts the edge of `unobscuredRootViewRect` without causing
// unwanted autoscrolling.
if (autoscrollDelta.width() < insetDistanceThreshold)
insetUnobscuredRootViewRect.shiftXEdgeTo(insetUnobscuredRootViewRect.x() + std::min<float>(edgeInset, -autoscrollDelta.width() - insetDistanceThreshold));
else if (autoscrollDelta.width() > insetDistanceThreshold)
insetUnobscuredRootViewRect.shiftMaxXEdgeTo(insetUnobscuredRootViewRect.maxX() - std::min<float>(edgeInset, autoscrollDelta.width() - insetDistanceThreshold));
if (autoscrollDelta.height() < insetDistanceThreshold)
insetUnobscuredRootViewRect.shiftYEdgeTo(insetUnobscuredRootViewRect.y() + std::min<float>(edgeInset, -autoscrollDelta.height() - insetDistanceThreshold));
else if (autoscrollDelta.height() > insetDistanceThreshold)
insetUnobscuredRootViewRect.shiftMaxYEdgeTo(insetUnobscuredRootViewRect.maxY() - std::min<float>(edgeInset, autoscrollDelta.height() - insetDistanceThreshold));
}
// If the current autoscroll point is beyond the edge of the view (respecting insets), shift it outside
// of the view, so that autoscrolling will occur. The distance we move outside of the view is scaled from
// `edgeInset` to `maximumScrollingSpeed` so that the inset's contribution to the speed is independent of its size.
if (autoscrollPoint.x() < insetUnobscuredRootViewRect.x()) {
float distanceFromEdge = autoscrollPoint.x() - insetUnobscuredRootViewRect.x();
if (distanceFromEdge < 0)
resultPoint.setX(unobscuredRootViewRect.x() + ((distanceFromEdge / edgeInset) * maximumScrollingSpeed));
} else if (autoscrollPoint.x() >= insetUnobscuredRootViewRect.maxX()) {
float distanceFromEdge = autoscrollPoint.x() - insetUnobscuredRootViewRect.maxX();
if (distanceFromEdge > 0)
resultPoint.setX(unobscuredRootViewRect.maxX() + ((distanceFromEdge / edgeInset) * maximumScrollingSpeed));
}
if (autoscrollPoint.y() < insetUnobscuredRootViewRect.y()) {
float distanceFromEdge = autoscrollPoint.y() - insetUnobscuredRootViewRect.y();
if (distanceFromEdge < 0)
resultPoint.setY(unobscuredRootViewRect.y() + ((distanceFromEdge / edgeInset) * maximumScrollingSpeed));
} else if (autoscrollPoint.y() >= insetUnobscuredRootViewRect.maxY()) {
float distanceFromEdge = autoscrollPoint.y() - insetUnobscuredRootViewRect.maxY();
if (distanceFromEdge > 0)
resultPoint.setY(unobscuredRootViewRect.maxY() + ((distanceFromEdge / edgeInset) * maximumScrollingSpeed));
}
return resultPoint;
}
IntPoint EventHandler::targetPositionInWindowForSelectionAutoscroll() const
{
Ref<Frame> protectedFrame(m_frame);
if (!m_frame.view())
return { };
auto& frameView = *m_frame.view();
// All work is done in "unscrolled" root view coordinates (as if delegatesScrolling were off),
// so that when the autoscrolling timer fires, it uses the new scroll position, so that it
// can keep scrolling without the client pushing a new contents-space target position via startSelectionAutoscroll.
auto scrollPosition = toIntSize(frameView.documentScrollPositionRelativeToViewOrigin());
FloatRect unobscuredContentRectInUnscrolledRootViewCoordinates = frameView.contentsToRootView(frameView.unobscuredContentRect());
unobscuredContentRectInUnscrolledRootViewCoordinates.move(-scrollPosition);
return adjustAutoscrollDestinationForInsetEdges(m_targetAutoscrollPositionInUnscrolledRootViewCoordinates, m_initialTargetAutoscrollPositionInUnscrolledRootViewCoordinates, unobscuredContentRectInUnscrolledRootViewCoordinates) + scrollPosition;
}
bool EventHandler::shouldUpdateAutoscroll()
{
return m_isAutoscrolling;
}
#if ENABLE(DRAG_SUPPORT)
bool EventHandler::eventLoopHandleMouseDragged(const MouseEventWithHitTestResults&)
{
return false;
}
bool EventHandler::tryToBeginDragAtPoint(const IntPoint& clientPosition, const IntPoint&)
{
Ref<Frame> protectedFrame(m_frame);
auto* document = m_frame.document();
if (!document)
return false;
SetForScope<bool> shouldAllowMouseDownToStartDrag { m_shouldAllowMouseDownToStartDrag, true };
document->updateLayoutIgnorePendingStylesheets();
FloatPoint adjustedClientPositionAsFloatPoint(clientPosition);
protectedFrame->nodeRespondingToClickEvents(clientPosition, adjustedClientPositionAsFloatPoint);
IntPoint adjustedClientPosition = roundedIntPoint(adjustedClientPositionAsFloatPoint);
IntPoint adjustedGlobalPosition = protectedFrame->view()->windowToContents(adjustedClientPosition);
PlatformMouseEvent syntheticMousePressEvent(adjustedClientPosition, adjustedGlobalPosition, LeftButton, PlatformEvent::MousePressed, 1, false, false, false, false, WallTime::now(), 0, NoTap);
PlatformMouseEvent syntheticMouseMoveEvent(adjustedClientPosition, adjustedGlobalPosition, LeftButton, PlatformEvent::MouseMoved, 0, false, false, false, false, WallTime::now(), 0, NoTap);
constexpr OptionSet<HitTestRequest::RequestType> hitType { HitTestRequest::Active, HitTestRequest::DisallowUserAgentShadowContent };
auto documentPoint = protectedFrame->view() ? protectedFrame->view()->windowToContents(syntheticMouseMoveEvent.position()) : syntheticMouseMoveEvent.position();
auto hitTestedMouseEvent = document->prepareMouseEvent(hitType, documentPoint, syntheticMouseMoveEvent);
RefPtr<Frame> subframe = subframeForHitTestResult(hitTestedMouseEvent);
if (subframe && subframe->eventHandler().tryToBeginDragAtPoint(adjustedClientPosition, adjustedGlobalPosition))
return true;
if (!eventMayStartDrag(syntheticMousePressEvent))
return false;
handleMousePressEvent(syntheticMousePressEvent);
bool handledDrag = m_mouseDownMayStartDrag && handleMouseDraggedEvent(hitTestedMouseEvent, DontCheckDragHysteresis);
// Reset this bit to prevent autoscrolling from updating the selection with the last mouse location.
m_mouseDownMayStartSelect = false;
// Reset this bit to ensure that WebChromeClientIOS::observedContentChange() is called by EventHandler::mousePressed()
// when we would process the next tap after a drag interaction.
m_mousePressed = false;
return handledDrag;
}
bool EventHandler::supportsSelectionUpdatesOnMouseDrag() const
{
return false;
}
bool EventHandler::shouldAllowMouseDownToStartDrag() const
{
return m_shouldAllowMouseDownToStartDrag;
}
#endif // ENABLE(DRAG_SUPPORT)
}
#endif // PLATFORM(IOS_FAMILY)