527 lines
21 KiB
C++
527 lines
21 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "APZEventState.h"
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#include <utility>
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#include "APZCCallbackHelper.h"
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#include "ActiveElementManager.h"
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#include "TouchManager.h"
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#include "mozilla/Assertions.h"
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#include "mozilla/BasicEvents.h"
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#include "mozilla/dom/Document.h"
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#include "mozilla/EventForwards.h"
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#include "mozilla/IntegerPrintfMacros.h"
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#include "mozilla/PositionedEventTargeting.h"
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#include "mozilla/Preferences.h"
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#include "mozilla/PresShell.h"
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#include "mozilla/ScrollContainerFrame.h"
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#include "mozilla/StaticPrefs_dom.h"
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#include "mozilla/StaticPrefs_ui.h"
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#include "mozilla/ToString.h"
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#include "mozilla/TouchEvents.h"
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#include "mozilla/ViewportUtils.h"
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#include "mozilla/dom/BrowserChild.h"
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#include "mozilla/dom/MouseEventBinding.h"
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#include "mozilla/dom/PointerEventHandler.h"
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#include "mozilla/layers/APZCCallbackHelper.h"
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#include "mozilla/layers/APZUtils.h"
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#include "mozilla/layers/IAPZCTreeManager.h"
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#include "mozilla/widget/nsAutoRollup.h"
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#include "nsCOMPtr.h"
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#include "nsContentUtils.h"
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#include "nsDocShell.h"
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#include "nsIDOMWindowUtils.h"
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#include "nsINamed.h"
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#include "nsIScrollbarMediator.h"
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#include "nsIWeakReferenceUtils.h"
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#include "nsIWidget.h"
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#include "nsLayoutUtils.h"
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#include "nsQueryFrame.h"
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static mozilla::LazyLogModule sApzEvtLog("apz.eventstate");
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#define APZES_LOG(...) MOZ_LOG(sApzEvtLog, LogLevel::Debug, (__VA_ARGS__))
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namespace mozilla {
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namespace layers {
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APZEventState::APZEventState(nsIWidget* aWidget,
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ContentReceivedInputBlockCallback&& aCallback)
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: mWidget(nullptr) // initialized in constructor body
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,
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mActiveElementManager(new ActiveElementManager()),
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mContentReceivedInputBlockCallback(std::move(aCallback)),
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mPendingTouchPreventedBlockId(0),
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mEndTouchState(apz::SingleTapState::NotClick),
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mLastTouchIdentifier(0) {
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nsresult rv;
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mWidget = do_GetWeakReference(aWidget, &rv);
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MOZ_ASSERT(NS_SUCCEEDED(rv),
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"APZEventState constructed with a widget that"
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" does not support weak references. APZ will NOT work!");
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}
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APZEventState::~APZEventState() = default;
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void APZEventState::ProcessSingleTap(const CSSPoint& aPoint,
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const CSSToLayoutDeviceScale& aScale,
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Modifiers aModifiers, int32_t aClickCount,
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uint64_t aInputBlockId) {
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APZES_LOG("Handling single tap at %s with %d\n", ToString(aPoint).c_str(),
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mTouchEndCancelled);
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RefPtr<nsIContent> touchRollup = GetTouchRollup();
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mTouchRollup = nullptr;
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nsCOMPtr<nsIWidget> widget = GetWidget();
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if (!widget) {
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return;
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}
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if (mTouchEndCancelled) {
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return;
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}
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nsCOMPtr<nsIWidget> localWidget = do_QueryReferent(mWidget);
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if (localWidget) {
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widget::nsAutoRollup rollup(touchRollup);
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APZCCallbackHelper::FireSingleTapEvent(
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aPoint * aScale, aModifiers, aClickCount, mPrecedingPointerDownState,
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localWidget);
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}
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mActiveElementManager->ProcessSingleTap();
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}
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PreventDefaultResult APZEventState::FireContextmenuEvents(
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PresShell* aPresShell, const CSSPoint& aPoint,
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const CSSToLayoutDeviceScale& aScale, Modifiers aModifiers,
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const nsCOMPtr<nsIWidget>& aWidget) {
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// Suppress retargeting for mouse events generated by a long-press
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EventRetargetSuppression suppression;
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// Synthesize mousemove event for allowing users to emulate to move mouse
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// cursor over the element. As a result, users can open submenu UI which
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// is opened when mouse cursor is moved over a link (i.e., it's a case that
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// users cannot stay in the page after tapping it). So, this improves
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// accessibility in websites which are designed for desktop.
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// Note that we don't need to check whether mousemove event is consumed or
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// not because Chrome also ignores the result.
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APZCCallbackHelper::DispatchSynthesizedMouseEvent(
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eMouseMove, aPoint * aScale, aModifiers, 0 /* clickCount */,
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mPrecedingPointerDownState, aWidget);
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PreventDefaultResult preventDefaultResult =
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APZCCallbackHelper::DispatchSynthesizedContextmenuEvent(
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aPoint * aScale, aModifiers, aWidget);
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APZES_LOG("Contextmenu event %s\n", ToString(preventDefaultResult).c_str());
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if (preventDefaultResult != PreventDefaultResult::No) {
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// If the contextmenu event was handled then we're showing a contextmenu,
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// and so we should remove any activation
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mActiveElementManager->ClearActivation();
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#ifndef XP_WIN
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} else {
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// If the contextmenu wasn't consumed, fire the eMouseLongTap event.
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nsEventStatus status = APZCCallbackHelper::DispatchSynthesizedMouseEvent(
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eMouseLongTap, aPoint * aScale, aModifiers,
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/*clickCount*/ 1, mPrecedingPointerDownState, aWidget);
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APZES_LOG("eMouseLongTap event %s\n", ToString(status).c_str());
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#endif
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}
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return preventDefaultResult;
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}
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void APZEventState::ProcessLongTap(PresShell* aPresShell,
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const CSSPoint& aPoint,
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const CSSToLayoutDeviceScale& aScale,
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Modifiers aModifiers,
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uint64_t aInputBlockId) {
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APZES_LOG("Handling long tap at %s block id %" PRIu64 "\n",
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ToString(aPoint).c_str(), aInputBlockId);
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nsCOMPtr<nsIWidget> widget = GetWidget();
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if (!widget) {
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return;
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}
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// If the touch block is waiting for a content response, send one now.
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// Bug 1848736: Why is a content response needed here? Can it be removed?
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// However, do not clear |mPendingTouchPreventedResponse|, because APZ will
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// wait for an additional content response before processing touch-move
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// events (since the first touch-move could still be prevented, and that
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// should prevent the touch block from being processed).
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if (mPendingTouchPreventedResponse) {
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APZES_LOG("Sending response %d for pending guid: %s block id: %" PRIu64
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" due to long tap\n",
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false, ToString(mPendingTouchPreventedGuid).c_str(),
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mPendingTouchPreventedBlockId);
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mContentReceivedInputBlockCallback(mPendingTouchPreventedBlockId, false);
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}
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#ifdef XP_WIN
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// On Windows, we fire the contextmenu events when the user lifts their
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// finger, in keeping with the platform convention. This happens in the
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// ProcessLongTapUp function. However, we still fire the eMouseLongTap event
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// at this time, because things like text selection or dragging may want
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// to know about it.
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APZCCallbackHelper::DispatchSynthesizedMouseEvent(
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eMouseLongTap, aPoint * aScale, aModifiers, /*clickCount*/ 1,
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mPrecedingPointerDownState, widget);
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#else
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PreventDefaultResult preventDefaultResult =
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FireContextmenuEvents(aPresShell, aPoint, aScale, aModifiers, widget);
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#endif
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const bool contextmenuOpen =
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#ifdef XP_WIN
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// On Windows context menu will never be opened by long tap events, the
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// menu will open after the user lifts their finger.
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false;
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#elif defined(MOZ_WIDGET_ANDROID)
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// On Android, GeckoView calls preventDefault() in a JSActor
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// (ContentDelegateChild.sys.mjs) when opening context menu so that we can
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// tell whether contextmenu opens in response to the contextmenu event by
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// checking where preventDefault() got called.
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preventDefaultResult == PreventDefaultResult::ByChrome;
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#else
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// On desktop platforms (other than Windows) unlike Android, context menu
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// can be opened anywhere even if, for example, there's no link under the
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// touch point. So we can assume that "not preventDefault" means a context
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// menu is open.
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preventDefaultResult == PreventDefaultResult::No;
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#endif
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// Assuming that contextmenuOpen=true here means a context menu was opened, it
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// will be treated as "preventDefaulted" in APZ.
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mContentReceivedInputBlockCallback(aInputBlockId, contextmenuOpen);
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if (contextmenuOpen) {
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// Also send a touchcancel to content
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// a) on Android if browser's contextmenu is open
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// b) on desktop platforms other than Windows if browser's contextmenu is
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// open
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// so that listeners that might be waiting for a touchend don't trigger.
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WidgetTouchEvent cancelTouchEvent(true, eTouchCancel, widget.get());
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cancelTouchEvent.mModifiers = aModifiers;
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auto ldPoint = LayoutDeviceIntPoint::Round(aPoint * aScale);
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cancelTouchEvent.mTouches.AppendElement(new mozilla::dom::Touch(
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mLastTouchIdentifier, ldPoint, LayoutDeviceIntPoint(), 0, 0));
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APZCCallbackHelper::DispatchWidgetEvent(cancelTouchEvent);
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}
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}
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void APZEventState::ProcessLongTapUp(PresShell* aPresShell,
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const CSSPoint& aPoint,
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const CSSToLayoutDeviceScale& aScale,
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Modifiers aModifiers) {
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#ifdef XP_WIN
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nsCOMPtr<nsIWidget> widget = GetWidget();
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if (widget) {
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FireContextmenuEvents(aPresShell, aPoint, aScale, aModifiers, widget);
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}
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#endif
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}
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void APZEventState::ProcessTouchEvent(
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const WidgetTouchEvent& aEvent, const ScrollableLayerGuid& aGuid,
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uint64_t aInputBlockId, nsEventStatus aApzResponse,
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nsEventStatus aContentResponse,
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nsTArray<TouchBehaviorFlags>&& aAllowedTouchBehaviors) {
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if (aEvent.mMessage == eTouchStart && aEvent.mTouches.Length() > 0) {
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mActiveElementManager->SetTargetElement(
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aEvent.mTouches[0]->GetOriginalTarget());
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mLastTouchIdentifier = aEvent.mTouches[0]->Identifier();
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}
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if (aEvent.mMessage == eTouchStart) {
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// We get the allowed touch behaviors on a touchstart, but may not actually
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// use them until the first touchmove, so we stash them in a member
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// variable.
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mTouchBlockAllowedBehaviors = std::move(aAllowedTouchBehaviors);
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}
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bool isTouchPrevented = aContentResponse == nsEventStatus_eConsumeNoDefault;
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bool mayNeedPointerCancelEvent = false;
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APZES_LOG("Handling event type %d isPrevented=%d\n", aEvent.mMessage,
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isTouchPrevented);
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switch (aEvent.mMessage) {
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case eTouchStart: {
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mTouchEndCancelled = false;
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mReceivedNonTouchStart = false;
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mTouchRollup = do_GetWeakReference(widget::nsAutoRollup::GetLastRollup());
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SendPendingTouchPreventedResponse(false);
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// The above call may have sent a message to APZ if we get two
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// TOUCH_STARTs in a row and just responded to the first one.
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// We're about to send a response back to APZ, but we should only do it
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// for events that went through APZ (which should be all of them).
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MOZ_ASSERT(aEvent.mFlags.mHandledByAPZ);
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// If the first touchstart event was preventDefaulted, ensure that any
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// subsequent additional touchstart events also get preventDefaulted. This
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// ensures that e.g. pinch zooming is prevented even if just the first
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// touchstart was prevented by content.
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if (mTouchCounter.GetActiveTouchCount() == 0) {
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mFirstTouchCancelled = isTouchPrevented;
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const PointerInfo* pointerInfo =
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!aEvent.mTouches.IsEmpty() ? PointerEventHandler::GetPointerInfo(
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aEvent.mTouches[0]->Identifier())
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: nullptr;
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mPrecedingPointerDownState =
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pointerInfo && pointerInfo->mPreventMouseEventByContent
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? PrecedingPointerDown::ConsumedByContent
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: PrecedingPointerDown::NotConsumed;
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} else {
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if (mFirstTouchCancelled && !isTouchPrevented) {
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APZES_LOG(
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"Propagating prevent-default from first-touch for block %" PRIu64
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"\n",
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aInputBlockId);
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}
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isTouchPrevented |= mFirstTouchCancelled;
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}
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mTouchStartPrevented = isTouchPrevented;
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if (isTouchPrevented) {
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mContentReceivedInputBlockCallback(aInputBlockId, isTouchPrevented);
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} else {
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APZES_LOG("Event not prevented; pending response for %" PRIu64 " %s\n",
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aInputBlockId, ToString(aGuid).c_str());
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mPendingTouchPreventedResponse = true;
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mPendingTouchPreventedGuid = aGuid;
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mPendingTouchPreventedBlockId = aInputBlockId;
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}
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break;
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}
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case eTouchEnd:
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if (isTouchPrevented) {
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mTouchEndCancelled = true;
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mEndTouchState = apz::SingleTapState::NotClick;
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}
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[[fallthrough]];
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case eTouchCancel:
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if (mActiveElementManager->HandleTouchEndEvent(mEndTouchState)) {
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mEndTouchState = apz::SingleTapState::NotClick;
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}
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[[fallthrough]];
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case eTouchMove: {
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if (!mReceivedNonTouchStart) {
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// In the case where `touchstart` was preventDefaulted,
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// pointercancel event should NOT be fired.
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mayNeedPointerCancelEvent = !isTouchPrevented && !mTouchStartPrevented;
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mReceivedNonTouchStart = true;
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}
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if (mPendingTouchPreventedResponse) {
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MOZ_ASSERT(aGuid == mPendingTouchPreventedGuid);
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if (aEvent.mMessage == eTouchCancel) {
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// If we received a touch-cancel and we were waiting for the
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// first touch-move to send a content response, make the content
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// response be preventDefault=true. This is the safer choice
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// because content might have prevented the first touch-move,
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// and even though the touch-cancel means any subsequent touch-moves
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// will not be processed, the content response still influences
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// the InputResult sent to GeckoView.
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isTouchPrevented = true;
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}
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mContentReceivedInputBlockCallback(aInputBlockId, isTouchPrevented);
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mPendingTouchPreventedResponse = false;
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}
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break;
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}
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case eTouchRawUpdate:
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break;
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default:
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MOZ_ASSERT_UNREACHABLE("Unknown touch event type");
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break;
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}
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mTouchCounter.Update(aEvent);
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if (mTouchCounter.GetActiveTouchCount() == 0) {
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mFirstTouchCancelled = false;
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}
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APZES_LOG("Pointercancel if %d %d %d %d\n", mayNeedPointerCancelEvent,
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!isTouchPrevented, aApzResponse == nsEventStatus_eConsumeDoDefault,
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MainThreadAgreesEventsAreConsumableByAPZ());
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// From https://w3c.github.io/pointerevents/#the-pointercancel-event;
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// The user agent MUST fire a pointer event named pointercancel when it
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// detects a scenario to suppress a pointer event stream.
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//
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// And "suppress a pointer event steam" is defined in
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// https://w3c.github.io/pointerevents/#suppressing-a-pointer-event-stream .
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//
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// There are four scenarios when the user agent fires a pointercancel event in
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// the spec. Below code corresponds to one of the scenarios (the third bullet
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// point);
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// The pointer is subsequently used by the user agent to manipulate the page
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// viewport (e.g. panning or zooming).
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if (mayNeedPointerCancelEvent &&
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aApzResponse == nsEventStatus_eConsumeDoDefault &&
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MainThreadAgreesEventsAreConsumableByAPZ()) {
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WidgetTouchEvent cancelEvent(aEvent);
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cancelEvent.mMessage = eTouchPointerCancel;
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cancelEvent.mFlags.mCancelable = false; // mMessage != eTouchCancel;
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for (uint32_t i = 0; i < cancelEvent.mTouches.Length(); ++i) {
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if (mozilla::dom::Touch* touch = cancelEvent.mTouches[i]) {
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touch->convertToPointer = true;
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}
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}
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nsEventStatus status;
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cancelEvent.mWidget->DispatchEvent(&cancelEvent, status);
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}
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}
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bool APZEventState::MainThreadAgreesEventsAreConsumableByAPZ() const {
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// APZ errs on the side of saying it can consume touch events to perform
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// default user-agent behaviours. In particular it may say this if it hasn't
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// received accurate touch-action information. Here we double-check using
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// accurate touch-action information. This code is kinda-sorta the main
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// thread equivalent of AsyncPanZoomController::ArePointerEventsConsumable().
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switch (mTouchBlockAllowedBehaviors.Length()) {
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case 0:
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// If we don't have any touch-action (e.g. because it is disabled) then
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// APZ has no restrictions.
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return true;
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case 1: {
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// If there's one touch point in this touch block, then check the pan-x
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// and pan-y flags. If neither is allowed, then we disagree with APZ and
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// say that it can't do anything with this touch block. Note that it would
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// be even better if we could check the allowed scroll directions of the
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// scrollframe at this point and refine this further.
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TouchBehaviorFlags flags = mTouchBlockAllowedBehaviors[0];
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return (flags & AllowedTouchBehavior::HORIZONTAL_PAN) ||
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(flags & AllowedTouchBehavior::VERTICAL_PAN);
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}
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case 2: {
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// If there's two touch points in this touch block, check that they both
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// allow zooming.
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for (const auto& allowed : mTouchBlockAllowedBehaviors) {
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if (!(allowed & AllowedTouchBehavior::PINCH_ZOOM)) {
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return false;
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}
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}
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return true;
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}
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default:
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// More than two touch points? APZ shouldn't be doing anything with this,
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// so APZ shouldn't be consuming them.
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return false;
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}
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}
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void APZEventState::ProcessWheelEvent(const WidgetWheelEvent& aEvent,
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uint64_t aInputBlockId) {
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// If this event starts a swipe, indicate that it shouldn't result in a
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// scroll by setting defaultPrevented to true.
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bool defaultPrevented = aEvent.DefaultPrevented() || aEvent.TriggersSwipe();
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mContentReceivedInputBlockCallback(aInputBlockId, defaultPrevented);
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}
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void APZEventState::ProcessMouseEvent(const WidgetMouseEvent& aEvent,
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uint64_t aInputBlockId) {
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bool defaultPrevented = false;
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mContentReceivedInputBlockCallback(aInputBlockId, defaultPrevented);
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}
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void APZEventState::ProcessAPZStateChange(ViewID aViewId,
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APZStateChange aChange, int aArg,
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Maybe<uint64_t> aInputBlockId) {
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switch (aChange) {
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case APZStateChange::eTransformBegin: {
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ScrollContainerFrame* sf =
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nsLayoutUtils::FindScrollContainerFrameFor(aViewId);
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if (sf) {
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sf->SetTransformingByAPZ(true);
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}
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nsIContent* content = nsLayoutUtils::FindContentFor(aViewId);
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dom::Document* doc = content ? content->GetComposedDoc() : nullptr;
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nsCOMPtr<nsIDocShell> docshell(doc ? doc->GetDocShell() : nullptr);
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if (docshell && sf) {
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nsDocShell* nsdocshell = static_cast<nsDocShell*>(docshell.get());
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|
nsdocshell->NotifyAsyncPanZoomStarted();
|
|
}
|
|
break;
|
|
}
|
|
case APZStateChange::eTransformEnd: {
|
|
ScrollContainerFrame* sf =
|
|
nsLayoutUtils::FindScrollContainerFrameFor(aViewId);
|
|
if (sf) {
|
|
sf->SetTransformingByAPZ(false);
|
|
}
|
|
|
|
nsIContent* content = nsLayoutUtils::FindContentFor(aViewId);
|
|
dom::Document* doc = content ? content->GetComposedDoc() : nullptr;
|
|
nsCOMPtr<nsIDocShell> docshell(doc ? doc->GetDocShell() : nullptr);
|
|
if (docshell && sf) {
|
|
nsDocShell* nsdocshell = static_cast<nsDocShell*>(docshell.get());
|
|
nsdocshell->NotifyAsyncPanZoomStopped();
|
|
}
|
|
break;
|
|
}
|
|
case APZStateChange::eStartTouch: {
|
|
bool canBePanOrZoom = aArg;
|
|
mActiveElementManager->HandleTouchStart(canBePanOrZoom);
|
|
// If this is a non-scrollable content, set a timer for the amount of
|
|
// time specified by ui.touch_activation.duration_ms to clear the
|
|
// active element state.
|
|
APZES_LOG("%s: can-be-pan-or-zoom=%d", __FUNCTION__, aArg);
|
|
if (!canBePanOrZoom) {
|
|
MOZ_ASSERT(aInputBlockId.isSome());
|
|
}
|
|
break;
|
|
}
|
|
case APZStateChange::eStartPanning: {
|
|
// The user started to pan, so we don't want anything to be :active.
|
|
mActiveElementManager->ClearActivation();
|
|
break;
|
|
}
|
|
case APZStateChange::eEndTouch: {
|
|
mEndTouchState = static_cast<apz::SingleTapState>(aArg);
|
|
if (mActiveElementManager->HandleTouchEnd(mEndTouchState)) {
|
|
mEndTouchState = apz::SingleTapState::NotClick;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
void APZEventState::Destroy() { mActiveElementManager->Destroy(); }
|
|
|
|
void APZEventState::SendPendingTouchPreventedResponse(bool aPreventDefault) {
|
|
if (mPendingTouchPreventedResponse) {
|
|
APZES_LOG("Sending response %d for pending guid: %s block id: %" PRIu64
|
|
"\n",
|
|
aPreventDefault, ToString(mPendingTouchPreventedGuid).c_str(),
|
|
mPendingTouchPreventedBlockId);
|
|
mContentReceivedInputBlockCallback(mPendingTouchPreventedBlockId,
|
|
aPreventDefault);
|
|
mPendingTouchPreventedResponse = false;
|
|
}
|
|
}
|
|
|
|
already_AddRefed<nsIWidget> APZEventState::GetWidget() const {
|
|
nsCOMPtr<nsIWidget> result = do_QueryReferent(mWidget);
|
|
return result.forget();
|
|
}
|
|
|
|
already_AddRefed<nsIContent> APZEventState::GetTouchRollup() const {
|
|
nsCOMPtr<nsIContent> result = do_QueryReferent(mTouchRollup);
|
|
return result.forget();
|
|
}
|
|
|
|
} // namespace layers
|
|
} // namespace mozilla
|