| /* |
| * Copyright (C) 1999 Lars Knoll (knoll@kde.org) |
| * (C) 1999 Antti Koivisto (koivisto@kde.org) |
| * (C) 2001 Dirk Mueller (mueller@kde.org) |
| * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All |
| * rights reserved. |
| * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies) |
| * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. |
| * (http://www.torchmobile.com/) |
| * Copyright (C) 2011 Google Inc. All rights reserved. |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public License |
| * along with this library; see the file COPYING.LIB. If not, write to |
| * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| */ |
| |
| #include "core/events/EventDispatcher.h" |
| |
| #include "core/dom/ContainerNode.h" |
| #include "core/dom/Document.h" |
| #include "core/dom/Element.h" |
| #include "core/events/EventDispatchMediator.h" |
| #include "core/events/MouseEvent.h" |
| #include "core/events/ScopedEventQueue.h" |
| #include "core/events/WindowEventContext.h" |
| #include "core/frame/Deprecation.h" |
| #include "core/frame/FrameView.h" |
| #include "core/frame/LocalDOMWindow.h" |
| #include "core/frame/Settings.h" |
| #include "core/frame/UseCounter.h" |
| #include "core/html/HTMLElement.h" |
| #include "core/inspector/InspectorTraceEvents.h" |
| #include "platform/EventDispatchForbiddenScope.h" |
| #include "platform/tracing/TraceEvent.h" |
| #include "wtf/RefPtr.h" |
| |
| namespace blink { |
| |
| DispatchEventResult EventDispatcher::dispatchEvent( |
| Node& node, |
| EventDispatchMediator* mediator) { |
| TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("blink.debug"), |
| "EventDispatcher::dispatchEvent"); |
| #if DCHECK_IS_ON() |
| DCHECK(!EventDispatchForbiddenScope::isEventDispatchForbidden()); |
| #endif |
| EventDispatcher dispatcher(node, &mediator->event()); |
| return mediator->dispatchEvent(dispatcher); |
| } |
| |
| EventDispatcher::EventDispatcher(Node& node, Event* event) |
| : m_node(node), m_event(event) { |
| DCHECK(m_event.get()); |
| m_view = node.document().view(); |
| m_event->initEventPath(*m_node); |
| } |
| |
| void EventDispatcher::dispatchScopedEvent(Node& node, |
| EventDispatchMediator* mediator) { |
| // We need to set the target here because it can go away by the time we |
| // actually fire the event. |
| mediator->event().setTarget( |
| EventPath::eventTargetRespectingTargetRules(node)); |
| ScopedEventQueue::instance()->enqueueEventDispatchMediator(mediator); |
| } |
| |
| void EventDispatcher::dispatchSimulatedClick( |
| Node& node, |
| Event* underlyingEvent, |
| SimulatedClickMouseEventOptions mouseEventOptions, |
| SimulatedClickCreationScope creationScope) { |
| // This persistent vector doesn't cause leaks, because added Nodes are removed |
| // before dispatchSimulatedClick() returns. This vector is here just to |
| // prevent the code from running into an infinite recursion of |
| // dispatchSimulatedClick(). |
| DEFINE_STATIC_LOCAL(HeapHashSet<Member<Node>>, |
| nodesDispatchingSimulatedClicks, |
| (new HeapHashSet<Member<Node>>)); |
| |
| if (isDisabledFormControl(&node)) |
| return; |
| |
| if (nodesDispatchingSimulatedClicks.contains(&node)) |
| return; |
| |
| nodesDispatchingSimulatedClicks.add(&node); |
| |
| if (mouseEventOptions == SendMouseOverUpDownEvents) |
| EventDispatcher(node, MouseEvent::create(EventTypeNames::mouseover, |
| node.document().domWindow(), |
| underlyingEvent, creationScope)) |
| .dispatch(); |
| |
| if (mouseEventOptions != SendNoEvents) { |
| EventDispatcher(node, MouseEvent::create(EventTypeNames::mousedown, |
| node.document().domWindow(), |
| underlyingEvent, creationScope)) |
| .dispatch(); |
| node.setActive(true); |
| EventDispatcher(node, MouseEvent::create(EventTypeNames::mouseup, |
| node.document().domWindow(), |
| underlyingEvent, creationScope)) |
| .dispatch(); |
| } |
| // Some elements (e.g. the color picker) may set active state to true before |
| // calling this method and expect the state to be reset during the call. |
| node.setActive(false); |
| |
| // always send click |
| EventDispatcher(node, MouseEvent::create(EventTypeNames::click, |
| node.document().domWindow(), |
| underlyingEvent, creationScope)) |
| .dispatch(); |
| |
| nodesDispatchingSimulatedClicks.remove(&node); |
| } |
| |
| DispatchEventResult EventDispatcher::dispatch() { |
| TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("blink.debug"), |
| "EventDispatcher::dispatch"); |
| |
| #if DCHECK_IS_ON() |
| DCHECK(!m_eventDispatched); |
| m_eventDispatched = true; |
| #endif |
| if (event().eventPath().isEmpty()) { |
| // eventPath() can be empty if event path is shrinked by relataedTarget |
| // retargeting. |
| return DispatchEventResult::NotCanceled; |
| } |
| m_event->eventPath().ensureWindowEventContext(); |
| |
| m_event->setTarget(EventPath::eventTargetRespectingTargetRules(*m_node)); |
| #if DCHECK_IS_ON() |
| DCHECK(!EventDispatchForbiddenScope::isEventDispatchForbidden()); |
| #endif |
| DCHECK(m_event->target()); |
| TRACE_EVENT1("devtools.timeline", "EventDispatch", "data", |
| InspectorEventDispatchEvent::data(*m_event)); |
| EventDispatchHandlingState* preDispatchEventHandlerResult = nullptr; |
| if (dispatchEventPreProcess(preDispatchEventHandlerResult) == |
| ContinueDispatching) { |
| if (dispatchEventAtCapturing() == ContinueDispatching) { |
| if (dispatchEventAtTarget() == ContinueDispatching) |
| dispatchEventAtBubbling(); |
| } |
| } |
| dispatchEventPostProcess(preDispatchEventHandlerResult); |
| |
| // Ensure that after event dispatch, the event's target object is the |
| // outermost shadow DOM boundary. |
| m_event->setTarget(m_event->eventPath().windowEventContext().target()); |
| m_event->setCurrentTarget(nullptr); |
| TRACE_EVENT_INSTANT1(TRACE_DISABLED_BY_DEFAULT("devtools.timeline"), |
| "UpdateCounters", TRACE_EVENT_SCOPE_THREAD, "data", |
| InspectorUpdateCountersEvent::data()); |
| |
| return EventTarget::dispatchEventResult(*m_event); |
| } |
| |
| inline EventDispatchContinuation EventDispatcher::dispatchEventPreProcess( |
| EventDispatchHandlingState*& preDispatchEventHandlerResult) { |
| // Give the target node a chance to do some work before DOM event handlers get |
| // a crack. |
| preDispatchEventHandlerResult = |
| m_node->preDispatchEventHandler(m_event.get()); |
| return (m_event->eventPath().isEmpty() || m_event->propagationStopped()) |
| ? DoneDispatching |
| : ContinueDispatching; |
| } |
| |
| inline EventDispatchContinuation EventDispatcher::dispatchEventAtCapturing() { |
| // Trigger capturing event handlers, starting at the top and working our way |
| // down. |
| m_event->setEventPhase(Event::kCapturingPhase); |
| |
| if (m_event->eventPath().windowEventContext().handleLocalEvents(*m_event) && |
| m_event->propagationStopped()) |
| return DoneDispatching; |
| |
| for (size_t i = m_event->eventPath().size() - 1; i > 0; --i) { |
| const NodeEventContext& eventContext = m_event->eventPath()[i]; |
| if (eventContext.currentTargetSameAsTarget()) |
| continue; |
| eventContext.handleLocalEvents(*m_event); |
| if (m_event->propagationStopped()) |
| return DoneDispatching; |
| } |
| |
| return ContinueDispatching; |
| } |
| |
| inline EventDispatchContinuation EventDispatcher::dispatchEventAtTarget() { |
| m_event->setEventPhase(Event::kAtTarget); |
| m_event->eventPath()[0].handleLocalEvents(*m_event); |
| return m_event->propagationStopped() ? DoneDispatching : ContinueDispatching; |
| } |
| |
| inline void EventDispatcher::dispatchEventAtBubbling() { |
| // Trigger bubbling event handlers, starting at the bottom and working our way |
| // up. |
| size_t size = m_event->eventPath().size(); |
| for (size_t i = 1; i < size; ++i) { |
| const NodeEventContext& eventContext = m_event->eventPath()[i]; |
| if (eventContext.currentTargetSameAsTarget()) { |
| m_event->setEventPhase(Event::kAtTarget); |
| } else if (m_event->bubbles() && !m_event->cancelBubble()) { |
| m_event->setEventPhase(Event::kBubblingPhase); |
| } else { |
| if (m_event->bubbles() && m_event->cancelBubble() && |
| eventContext.node() && |
| eventContext.node()->hasEventListeners(m_event->type())) |
| UseCounter::count(eventContext.node()->document(), |
| UseCounter::EventCancelBubbleAffected); |
| continue; |
| } |
| eventContext.handleLocalEvents(*m_event); |
| if (m_event->propagationStopped()) |
| return; |
| } |
| if (m_event->bubbles() && !m_event->cancelBubble()) { |
| m_event->setEventPhase(Event::kBubblingPhase); |
| m_event->eventPath().windowEventContext().handleLocalEvents(*m_event); |
| } else if (m_event->bubbles() && |
| m_event->eventPath().windowEventContext().window() && |
| m_event->eventPath() |
| .windowEventContext() |
| .window() |
| ->hasEventListeners(m_event->type())) { |
| UseCounter::count(m_event->eventPath() |
| .windowEventContext() |
| .window() |
| ->getExecutionContext(), |
| UseCounter::EventCancelBubbleAffected); |
| } |
| } |
| |
| inline void EventDispatcher::dispatchEventPostProcess( |
| EventDispatchHandlingState* preDispatchEventHandlerResult) { |
| m_event->setTarget(EventPath::eventTargetRespectingTargetRules(*m_node)); |
| m_event->setCurrentTarget(nullptr); |
| m_event->setEventPhase(0); |
| |
| // Pass the data from the preDispatchEventHandler to the |
| // postDispatchEventHandler. |
| m_node->postDispatchEventHandler(m_event.get(), |
| preDispatchEventHandlerResult); |
| |
| bool isClick = m_event->isMouseEvent() && |
| toMouseEvent(*m_event).type() == EventTypeNames::click; |
| if (isClick) { |
| // Fire an accessibility event indicating a node was clicked on. This is |
| // safe if m_event->target()->toNode() returns null. |
| if (AXObjectCache* cache = m_node->document().existingAXObjectCache()) |
| cache->handleClicked(m_event->target()->toNode()); |
| } |
| |
| // The DOM Events spec says that events dispatched by JS (other than "click") |
| // should not have their default handlers invoked. |
| bool isTrustedOrClick = |
| !RuntimeEnabledFeatures::trustedEventsDefaultActionEnabled() || |
| m_event->isTrusted() || isClick; |
| |
| // For Android WebView (distinguished by wideViewportQuirkEnabled) |
| // enable untrusted events for mouse down on select elements because |
| // fastclick.js seems to generate these. crbug.com/642698 |
| // TODO(dtapuska): Change this to a target SDK quirk crbug.com/643705 |
| if (!isTrustedOrClick && m_event->isMouseEvent() && |
| m_event->type() == EventTypeNames::mousedown && |
| isHTMLSelectElement(*m_node)) { |
| if (Settings* settings = m_node->document().settings()) { |
| isTrustedOrClick = settings->wideViewportQuirkEnabled(); |
| } |
| } |
| |
| // Call default event handlers. While the DOM does have a concept of |
| // preventing default handling, the detail of which handlers are called is an |
| // internal implementation detail and not part of the DOM. |
| if (!m_event->defaultPrevented() && !m_event->defaultHandled() && |
| isTrustedOrClick) { |
| // Non-bubbling events call only one default event handler, the one for the |
| // target. |
| m_node->willCallDefaultEventHandler(*m_event); |
| m_node->defaultEventHandler(m_event.get()); |
| DCHECK(!m_event->defaultPrevented()); |
| // For bubbling events, call default event handlers on the same targets in |
| // the same order as the bubbling phase. |
| if (!m_event->defaultHandled() && m_event->bubbles()) { |
| size_t size = m_event->eventPath().size(); |
| for (size_t i = 1; i < size; ++i) { |
| m_event->eventPath()[i].node()->willCallDefaultEventHandler(*m_event); |
| m_event->eventPath()[i].node()->defaultEventHandler(m_event.get()); |
| DCHECK(!m_event->defaultPrevented()); |
| if (m_event->defaultHandled()) |
| break; |
| } |
| } |
| } |
| |
| // Track the usage of sending a mousedown event to a select element to force |
| // it to open. This measures a possible breakage of not allowing untrusted |
| // events to open select boxes. |
| if (!m_event->isTrusted() && m_event->isMouseEvent() && |
| m_event->type() == EventTypeNames::mousedown && |
| isHTMLSelectElement(*m_node)) { |
| UseCounter::count(m_node->document(), |
| UseCounter::UntrustedMouseDownEventDispatchedToSelect); |
| } |
| } |
| |
| } // namespace blink |
