accessible/base/nsEventShell.cpp

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #include "nsEventShell.h"
   7
   8 #include "nsAccUtils.h"
   9 #include "Logging.h"
  10 #include "AccAttributes.h"
  11
  12 #include "mozilla/StaticPtr.h"
  13 #include "mozilla/dom/DOMStringList.h"
  14
  15 using namespace mozilla;
  16 using namespace mozilla::a11y;
  17
  18 ////////////////////////////////////////////////////////////////////////////////
  19 // nsEventShell
  20 ////////////////////////////////////////////////////////////////////////////////
  21
  22 void nsEventShell::FireEvent(AccEvent* aEvent) {
  23   if (!aEvent || aEvent->mEventRule == AccEvent::eDoNotEmit) return;
  24
  25   LocalAccessible* accessible = aEvent->GetAccessible();
  26   NS_ENSURE_TRUE_VOID(accessible);
  27
  28   nsINode* node = accessible->GetNode();
  29   if (node) {
  30     sEventTargetNode = node;
  31     sEventFromUserInput = aEvent->IsFromUserInput();
  32   }
  33
  34 #ifdef A11Y_LOG
  35   if (logging::IsEnabled(logging::eEvents)) {
  36     logging::MsgBegin("EVENTS", "events fired");
  37     nsAutoString type;
  38     GetAccService()->GetStringEventType(aEvent->GetEventType(), type);
  39     logging::MsgEntry("type: %s", NS_ConvertUTF16toUTF8(type).get());
  40     if (aEvent->GetEventType() == nsIAccessibleEvent::EVENT_STATE_CHANGE) {
  41       AccStateChangeEvent* event = downcast_accEvent(aEvent);
  42       RefPtr<dom::DOMStringList> stringStates =
  43           GetAccService()->GetStringStates(event->GetState());
  44       nsAutoString state;
  45       stringStates->Item(0, state);
  46       logging::MsgEntry("state: %s = %s", NS_ConvertUTF16toUTF8(state).get(),
  47                         event->IsStateEnabled() ? "true" : "false");
  48     }
  49     logging::AccessibleInfo("target", aEvent->GetAccessible());
  50     logging::MsgEnd();
  51   }
  52 #endif
  53
  54   accessible->HandleAccEvent(aEvent);
  55   aEvent->mEventRule = AccEvent::eDoNotEmit;
  56
  57   sEventTargetNode = nullptr;
  58 }
  59
  60 void nsEventShell::FireEvent(uint32_t aEventType, LocalAccessible* aAccessible,
  61                              EIsFromUserInput aIsFromUserInput) {
  62   NS_ENSURE_TRUE_VOID(aAccessible);
  63
  64   RefPtr<AccEvent> event =
  65       new AccEvent(aEventType, aAccessible, aIsFromUserInput);
  66
  67   FireEvent(event);
  68 }
  69
  70 void nsEventShell::GetEventAttributes(nsINode* aNode,
  71                                       AccAttributes* aAttributes) {
  72   if (aNode != sEventTargetNode) return;
  73
  74   aAttributes->SetAttribute(nsGkAtoms::eventFromInput, sEventFromUserInput);
  75 }
  76
  77 ////////////////////////////////////////////////////////////////////////////////
  78 // nsEventShell: private
  79
  80 bool nsEventShell::sEventFromUserInput = false;
  81 StaticRefPtr<nsINode> nsEventShell::sEventTargetNode;