зеркало из https://github.com/mozilla/gecko-dev.git
523 строки
20 KiB
C++
523 строки
20 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 "PositionedEventTargeting.h"
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#include "mozilla/EventListenerManager.h"
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#include "mozilla/EventStates.h"
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#include "mozilla/MouseEvents.h"
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#include "mozilla/Preferences.h"
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#include "mozilla/PresShell.h"
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#include "mozilla/dom/MouseEventBinding.h"
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#include "nsFrameList.h" // for DEBUG_FRAME_DUMP
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#include "nsHTMLParts.h"
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#include "nsLayoutUtils.h"
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#include "nsGkAtoms.h"
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#include "nsFontMetrics.h"
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#include "nsPrintfCString.h"
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#include "mozilla/dom/Element.h"
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#include "nsRegion.h"
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#include "nsDeviceContext.h"
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#include "nsIContentInlines.h"
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#include "nsIFrame.h"
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#include <algorithm>
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#include "LayersLogging.h"
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using namespace mozilla;
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using namespace mozilla::dom;
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// If debugging this code you may wish to enable this logging, via
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// the env var MOZ_LOG="event.retarget:4". For extra logging (getting
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// frame dumps, use MOZ_LOG="event.retarget:5".
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static mozilla::LazyLogModule sEvtTgtLog("event.retarget");
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#define PET_LOG(...) MOZ_LOG(sEvtTgtLog, LogLevel::Debug, (__VA_ARGS__))
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namespace mozilla {
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/*
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* The basic goal of FindFrameTargetedByInputEvent() is to find a good
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* target element that can respond to mouse events. Both mouse events and touch
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* events are targeted at this element. Note that even for touch events, we
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* check responsiveness to mouse events. We assume Web authors
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* designing for touch events will take their own steps to account for
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* inaccurate touch events.
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*
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* GetClickableAncestor() encapsulates the heuristic that determines whether an
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* element is expected to respond to mouse events. An element is deemed
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* "clickable" if it has registered listeners for "click", "mousedown" or
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* "mouseup", or is on a whitelist of element tags (<a>, <button>, <input>,
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* <select>, <textarea>, <label>), or has role="button", or is a link, or
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* is a suitable XUL element.
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* Any descendant (in the same document) of a clickable element is also
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* deemed clickable since events will propagate to the clickable element from
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* its descendant.
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*
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* If the element directly under the event position is clickable (or
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* event radii are disabled), we always use that element. Otherwise we collect
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* all frames intersecting a rectangle around the event position (taking CSS
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* transforms into account) and choose the best candidate in GetClosest().
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* Only GetClickableAncestor() candidates are considered; if none are found,
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* then we revert to targeting the element under the event position.
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* We ignore candidates outside the document subtree rooted by the
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* document of the element directly under the event position. This ensures that
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* event listeners in ancestor documents don't make it completely impossible
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* to target a non-clickable element in a child document.
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*
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* When both a frame and its ancestor are in the candidate list, we ignore
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* the ancestor. Otherwise a large ancestor element with a mouse event listener
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* and some descendant elements that need to be individually targetable would
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* disable intelligent targeting of those descendants within its bounds.
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*
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* GetClosest() computes the transformed axis-aligned bounds of each
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* candidate frame, then computes the Manhattan distance from the event point
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* to the bounds rect (which can be zero). The frame with the
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* shortest distance is chosen. For visited links we multiply the distance
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* by a specified constant weight; this can be used to make visited links
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* more or less likely to be targeted than non-visited links.
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*/
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struct EventRadiusPrefs {
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uint32_t mVisitedWeight; // in percent, i.e. default is 100
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uint32_t mSideRadii[4]; // TRBL order, in millimetres
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bool mEnabled;
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bool mRegistered;
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bool mTouchOnly;
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bool mRepositionEventCoords;
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};
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static EventRadiusPrefs sMouseEventRadiusPrefs;
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static EventRadiusPrefs sTouchEventRadiusPrefs;
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static const EventRadiusPrefs* GetPrefsFor(EventClassID aEventClassID) {
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EventRadiusPrefs* prefs = nullptr;
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const char* prefBranch = nullptr;
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if (aEventClassID == eTouchEventClass) {
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prefBranch = "touch";
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prefs = &sTouchEventRadiusPrefs;
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} else if (aEventClassID == eMouseEventClass) {
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// Mostly for testing purposes
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prefBranch = "mouse";
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prefs = &sMouseEventRadiusPrefs;
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} else {
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return nullptr;
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}
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if (!prefs->mRegistered) {
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prefs->mRegistered = true;
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nsPrintfCString enabledPref("ui.%s.radius.enabled", prefBranch);
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Preferences::AddBoolVarCache(&prefs->mEnabled, enabledPref, false);
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nsPrintfCString visitedWeightPref("ui.%s.radius.visitedWeight", prefBranch);
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Preferences::AddUintVarCache(&prefs->mVisitedWeight, visitedWeightPref,
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100);
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static const char prefNames[4][9] = {"topmm", "rightmm", "bottommm",
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"leftmm"};
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for (int32_t i = 0; i < 4; ++i) {
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nsPrintfCString radiusPref("ui.%s.radius.%s", prefBranch, prefNames[i]);
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Preferences::AddUintVarCache(&prefs->mSideRadii[i], radiusPref, 0);
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}
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if (aEventClassID == eMouseEventClass) {
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Preferences::AddBoolVarCache(
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&prefs->mTouchOnly, "ui.mouse.radius.inputSource.touchOnly", true);
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} else {
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prefs->mTouchOnly = false;
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}
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nsPrintfCString repositionPref("ui.%s.radius.reposition", prefBranch);
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Preferences::AddBoolVarCache(&prefs->mRepositionEventCoords, repositionPref,
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false);
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}
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return prefs;
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}
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static bool HasMouseListener(nsIContent* aContent) {
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if (EventListenerManager* elm = aContent->GetExistingListenerManager()) {
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return elm->HasListenersFor(nsGkAtoms::onclick) ||
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elm->HasListenersFor(nsGkAtoms::onmousedown) ||
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elm->HasListenersFor(nsGkAtoms::onmouseup);
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}
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return false;
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}
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static bool HasTouchListener(nsIContent* aContent) {
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EventListenerManager* elm = aContent->GetExistingListenerManager();
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if (!elm) {
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return false;
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}
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// FIXME: Should this really use the pref rather than TouchEvent::PrefEnabled
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// or such?
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if (!StaticPrefs::dom_w3c_touch_events_enabled()) {
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return false;
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}
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return elm->HasListenersFor(nsGkAtoms::ontouchstart) ||
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elm->HasListenersFor(nsGkAtoms::ontouchend);
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}
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static bool IsDescendant(nsIFrame* aFrame, nsIContent* aAncestor,
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nsAutoString* aLabelTargetId) {
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for (nsIContent* content = aFrame->GetContent(); content;
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content = content->GetFlattenedTreeParent()) {
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if (aLabelTargetId && content->IsHTMLElement(nsGkAtoms::label)) {
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content->AsElement()->GetAttr(kNameSpaceID_None, nsGkAtoms::_for,
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*aLabelTargetId);
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}
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if (content == aAncestor) {
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return true;
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}
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}
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return false;
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}
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static nsIContent* GetClickableAncestor(
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nsIFrame* aFrame, nsAtom* stopAt = nullptr,
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nsAutoString* aLabelTargetId = nullptr) {
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// Input events propagate up the content tree so we'll follow the content
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// ancestors to look for elements accepting the click.
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for (nsIContent* content = aFrame->GetContent(); content;
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content = content->GetFlattenedTreeParent()) {
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if (stopAt && content->IsHTMLElement(stopAt)) {
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break;
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}
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if (HasTouchListener(content) || HasMouseListener(content)) {
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return content;
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}
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if (content->IsAnyOfHTMLElements(nsGkAtoms::button, nsGkAtoms::input,
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nsGkAtoms::select, nsGkAtoms::textarea)) {
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return content;
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}
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if (content->IsHTMLElement(nsGkAtoms::label)) {
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if (aLabelTargetId) {
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content->AsElement()->GetAttr(kNameSpaceID_None, nsGkAtoms::_for,
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*aLabelTargetId);
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}
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return content;
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}
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// Bug 921928: we don't have access to the content of remote iframe.
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// So fluffing won't go there. We do an optimistic assumption here:
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// that the content of the remote iframe needs to be a target.
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if (content->IsHTMLElement(nsGkAtoms::iframe) &&
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content->AsElement()->AttrValueIs(kNameSpaceID_None,
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nsGkAtoms::mozbrowser,
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nsGkAtoms::_true, eIgnoreCase) &&
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content->AsElement()->AttrValueIs(kNameSpaceID_None, nsGkAtoms::remote,
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nsGkAtoms::_true, eIgnoreCase)) {
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return content;
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}
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// See nsCSSFrameConstructor::FindXULTagData. This code is not
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// really intended to be used with XUL, though.
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if (content->IsAnyOfXULElements(
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nsGkAtoms::button, nsGkAtoms::checkbox, nsGkAtoms::radio,
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nsGkAtoms::menu, nsGkAtoms::menuitem, nsGkAtoms::menulist,
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nsGkAtoms::scrollbarbutton, nsGkAtoms::resizer)) {
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return content;
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}
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static Element::AttrValuesArray clickableRoles[] = {
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nsGkAtoms::button, nsGkAtoms::key, nullptr};
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if (content->IsElement() && content->AsElement()->FindAttrValueIn(
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kNameSpaceID_None, nsGkAtoms::role,
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clickableRoles, eIgnoreCase) >= 0) {
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return content;
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}
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if (content->IsEditable()) {
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return content;
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}
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nsCOMPtr<nsIURI> linkURI;
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if (content->IsLink(getter_AddRefs(linkURI))) {
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return content;
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}
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}
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return nullptr;
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}
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static nscoord AppUnitsFromMM(nsIFrame* aFrame, uint32_t aMM) {
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nsPresContext* pc = aFrame->PresContext();
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PresShell* presShell = pc->PresShell();
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float result = float(aMM) * (pc->DeviceContext()->AppUnitsPerPhysicalInch() /
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MM_PER_INCH_FLOAT);
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result = result / presShell->GetResolution();
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return NSToCoordRound(result);
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}
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/**
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* Clip aRect with the bounds of aFrame in the coordinate system of
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* aRootFrame. aRootFrame is an ancestor of aFrame.
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*/
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static nsRect ClipToFrame(nsIFrame* aRootFrame, nsIFrame* aFrame,
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nsRect& aRect) {
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nsRect bound = nsLayoutUtils::TransformFrameRectToAncestor(
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aFrame, nsRect(nsPoint(0, 0), aFrame->GetSize()), aRootFrame);
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nsRect result = bound.Intersect(aRect);
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return result;
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}
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static nsRect GetTargetRect(nsIFrame* aRootFrame,
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const nsPoint& aPointRelativeToRootFrame,
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nsIFrame* aRestrictToDescendants,
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const EventRadiusPrefs* aPrefs, uint32_t aFlags) {
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nsMargin m(AppUnitsFromMM(aRootFrame, aPrefs->mSideRadii[0]),
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AppUnitsFromMM(aRootFrame, aPrefs->mSideRadii[1]),
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AppUnitsFromMM(aRootFrame, aPrefs->mSideRadii[2]),
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AppUnitsFromMM(aRootFrame, aPrefs->mSideRadii[3]));
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nsRect r(aPointRelativeToRootFrame, nsSize(0, 0));
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r.Inflate(m);
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if (!(aFlags & INPUT_IGNORE_ROOT_SCROLL_FRAME)) {
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// Don't clip this rect to the root scroll frame if the flag to ignore the
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// root scroll frame is set. Note that the GetClosest code will still
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// enforce that the target found is a descendant of aRestrictToDescendants.
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r = ClipToFrame(aRootFrame, aRestrictToDescendants, r);
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}
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return r;
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}
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static float ComputeDistanceFromRect(const nsPoint& aPoint,
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const nsRect& aRect) {
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nscoord dx =
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std::max(0, std::max(aRect.x - aPoint.x, aPoint.x - aRect.XMost()));
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nscoord dy =
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std::max(0, std::max(aRect.y - aPoint.y, aPoint.y - aRect.YMost()));
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return float(NS_hypot(dx, dy));
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}
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static float ComputeDistanceFromRegion(const nsPoint& aPoint,
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const nsRegion& aRegion) {
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MOZ_ASSERT(!aRegion.IsEmpty(),
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"can't compute distance between point and empty region");
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float minDist = -1;
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for (auto iter = aRegion.RectIter(); !iter.Done(); iter.Next()) {
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float dist = ComputeDistanceFromRect(aPoint, iter.Get());
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if (dist < minDist || minDist < 0) {
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minDist = dist;
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}
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}
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return minDist;
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}
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// Subtract aRegion from aExposedRegion as long as that doesn't make the
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// exposed region get too complex or removes a big chunk of the exposed region.
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static void SubtractFromExposedRegion(nsRegion* aExposedRegion,
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const nsRegion& aRegion) {
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if (aRegion.IsEmpty()) return;
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nsRegion tmp;
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tmp.Sub(*aExposedRegion, aRegion);
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// Don't let *aExposedRegion get too complex, but don't let it fluff out to
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// its bounds either. Do let aExposedRegion get more complex if by doing so
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// we reduce its area by at least half.
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if (tmp.GetNumRects() <= 15 || tmp.Area() <= aExposedRegion->Area() / 2) {
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*aExposedRegion = tmp;
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}
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}
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static nsIFrame* GetClosest(nsIFrame* aRoot,
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const nsPoint& aPointRelativeToRootFrame,
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const nsRect& aTargetRect,
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const EventRadiusPrefs* aPrefs,
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nsIFrame* aRestrictToDescendants,
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nsIContent* aClickableAncestor,
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nsTArray<nsIFrame*>& aCandidates) {
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nsIFrame* bestTarget = nullptr;
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// Lower is better; distance is in appunits
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float bestDistance = 1e6f;
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nsRegion exposedRegion(aTargetRect);
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for (uint32_t i = 0; i < aCandidates.Length(); ++i) {
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nsIFrame* f = aCandidates[i];
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bool preservesAxisAlignedRectangles = false;
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nsRect borderBox = nsLayoutUtils::TransformFrameRectToAncestor(
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f, nsRect(nsPoint(0, 0), f->GetSize()), aRoot,
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&preservesAxisAlignedRectangles);
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PET_LOG("Checking candidate %p with border box %s\n", f,
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mozilla::layers::Stringify(borderBox).c_str());
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nsRegion region;
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region.And(exposedRegion, borderBox);
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if (region.IsEmpty()) {
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PET_LOG(" candidate %p had empty hit region\n", f);
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continue;
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}
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if (preservesAxisAlignedRectangles) {
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// Subtract from the exposed region if we have a transform that won't make
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// the bounds include a bunch of area that we don't actually cover.
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SubtractFromExposedRegion(&exposedRegion, region);
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}
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nsAutoString labelTargetId;
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if (aClickableAncestor &&
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!IsDescendant(f, aClickableAncestor, &labelTargetId)) {
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PET_LOG(" candidate %p is not a descendant of required ancestor\n", f);
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continue;
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}
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nsIContent* clickableContent =
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GetClickableAncestor(f, nsGkAtoms::body, &labelTargetId);
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if (!aClickableAncestor && !clickableContent) {
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PET_LOG(" candidate %p was not clickable\n", f);
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continue;
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}
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// If our current closest frame is a descendant of 'f', skip 'f' (prefer
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// the nested frame).
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if (bestTarget &&
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nsLayoutUtils::IsProperAncestorFrameCrossDoc(f, bestTarget, aRoot)) {
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PET_LOG(" candidate %p was ancestor for bestTarget %p\n", f, bestTarget);
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continue;
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}
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if (!aClickableAncestor && !nsLayoutUtils::IsAncestorFrameCrossDoc(
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aRestrictToDescendants, f, aRoot)) {
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PET_LOG(" candidate %p was not descendant of restrictroot %p\n", f,
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aRestrictToDescendants);
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continue;
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}
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// distance is in appunits
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float distance =
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ComputeDistanceFromRegion(aPointRelativeToRootFrame, region);
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nsIContent* content = f->GetContent();
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if (content && content->IsElement() &&
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content->AsElement()->State().HasState(
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EventStates(NS_EVENT_STATE_VISITED))) {
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distance *= aPrefs->mVisitedWeight / 100.0f;
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}
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if (distance < bestDistance) {
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PET_LOG(" candidate %p is the new best\n", f);
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bestDistance = distance;
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bestTarget = f;
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}
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}
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return bestTarget;
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}
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nsIFrame* FindFrameTargetedByInputEvent(
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WidgetGUIEvent* aEvent, nsIFrame* aRootFrame,
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const nsPoint& aPointRelativeToRootFrame, uint32_t aFlags) {
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using FrameForPointOption = nsLayoutUtils::FrameForPointOption;
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EnumSet<FrameForPointOption> options;
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if (aFlags & INPUT_IGNORE_ROOT_SCROLL_FRAME) {
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options += FrameForPointOption::IgnoreRootScrollFrame;
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}
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nsIFrame* target = nsLayoutUtils::GetFrameForPoint(
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aRootFrame, aPointRelativeToRootFrame, options);
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PET_LOG(
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"Found initial target %p for event class %s message %s point %s "
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"relative to root frame %p\n",
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target, ToChar(aEvent->mClass), ToChar(aEvent->mMessage),
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mozilla::layers::Stringify(aPointRelativeToRootFrame).c_str(),
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aRootFrame);
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const EventRadiusPrefs* prefs = GetPrefsFor(aEvent->mClass);
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if (!prefs || !prefs->mEnabled || EventRetargetSuppression::IsActive()) {
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PET_LOG("Retargeting disabled\n");
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return target;
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}
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nsIContent* clickableAncestor = nullptr;
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if (target) {
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clickableAncestor = GetClickableAncestor(target, nsGkAtoms::body);
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if (clickableAncestor) {
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PET_LOG("Target %p is clickable\n", target);
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// If the target that was directly hit has a clickable ancestor, that
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// means it too is clickable. And since it is the same as or a descendant
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// of clickableAncestor, it should become the root for the GetClosest
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// search.
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clickableAncestor = target->GetContent();
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}
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}
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// Do not modify targeting for actual mouse hardware; only for mouse
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// events generated by touch-screen hardware.
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if (aEvent->mClass == eMouseEventClass && prefs->mTouchOnly &&
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aEvent->AsMouseEvent()->mInputSource !=
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MouseEvent_Binding::MOZ_SOURCE_TOUCH) {
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PET_LOG("Mouse input event is not from a touch source\n");
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return target;
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}
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// If the exact target is non-null, only consider candidate targets in the
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// same document as the exact target. Otherwise, if an ancestor document has
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// a mouse event handler for example, targets that are !GetClickableAncestor
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// can never be targeted --- something nsSubDocumentFrame in an ancestor
|
|
// document would be targeted instead.
|
|
nsIFrame* restrictToDescendants =
|
|
target ? target->PresShell()->GetRootFrame() : aRootFrame;
|
|
|
|
nsRect targetRect = GetTargetRect(aRootFrame, aPointRelativeToRootFrame,
|
|
restrictToDescendants, prefs, aFlags);
|
|
PET_LOG("Expanded point to target rect %s\n",
|
|
mozilla::layers::Stringify(targetRect).c_str());
|
|
AutoTArray<nsIFrame*, 8> candidates;
|
|
nsresult rv = nsLayoutUtils::GetFramesForArea(aRootFrame, targetRect,
|
|
candidates, options);
|
|
if (NS_FAILED(rv)) {
|
|
return target;
|
|
}
|
|
|
|
nsIFrame* closestClickable =
|
|
GetClosest(aRootFrame, aPointRelativeToRootFrame, targetRect, prefs,
|
|
restrictToDescendants, clickableAncestor, candidates);
|
|
if (closestClickable) {
|
|
target = closestClickable;
|
|
}
|
|
PET_LOG("Final target is %p\n", target);
|
|
|
|
#ifdef DEBUG_FRAME_DUMP
|
|
// At verbose logging level, dump the frame tree to help with debugging.
|
|
// Note that dumping the frame tree at the top of the function may flood
|
|
// logcat on Android devices and cause the PET_LOGs to get dropped.
|
|
if (MOZ_LOG_TEST(sEvtTgtLog, LogLevel::Verbose)) {
|
|
aRootFrame->DumpFrameTree();
|
|
}
|
|
#endif
|
|
|
|
if (!target || !prefs->mRepositionEventCoords) {
|
|
// No repositioning required for this event
|
|
return target;
|
|
}
|
|
|
|
// Take the point relative to the root frame, make it relative to the target,
|
|
// clamp it to the bounds, and then make it relative to the root frame again.
|
|
nsPoint point = aPointRelativeToRootFrame;
|
|
if (nsLayoutUtils::TRANSFORM_SUCCEEDED !=
|
|
nsLayoutUtils::TransformPoint(aRootFrame, target, point)) {
|
|
return target;
|
|
}
|
|
point = target->GetRectRelativeToSelf().ClampPoint(point);
|
|
if (nsLayoutUtils::TRANSFORM_SUCCEEDED !=
|
|
nsLayoutUtils::TransformPoint(target, aRootFrame, point)) {
|
|
return target;
|
|
}
|
|
// Now we basically undo the operations in GetEventCoordinatesRelativeTo, to
|
|
// get back the (now-clamped) coordinates in the event's widget's space.
|
|
nsView* view = aRootFrame->GetView();
|
|
if (!view) {
|
|
return target;
|
|
}
|
|
LayoutDeviceIntPoint widgetPoint = nsLayoutUtils::TranslateViewToWidget(
|
|
aRootFrame->PresContext(), view, point, aEvent->mWidget);
|
|
if (widgetPoint.x != NS_UNCONSTRAINEDSIZE) {
|
|
// If that succeeded, we update the point in the event
|
|
aEvent->mRefPoint = widgetPoint;
|
|
}
|
|
return target;
|
|
}
|
|
|
|
uint32_t EventRetargetSuppression::sSuppressionCount = 0;
|
|
|
|
EventRetargetSuppression::EventRetargetSuppression() { sSuppressionCount++; }
|
|
|
|
EventRetargetSuppression::~EventRetargetSuppression() { sSuppressionCount--; }
|
|
|
|
bool EventRetargetSuppression::IsActive() { return sSuppressionCount > 0; }
|
|
|
|
} // namespace mozilla
|