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Diffstat (limited to 'accessible/base/AccEvent.cpp')
| -rw-r--r-- | accessible/base/AccEvent.cpp | 256 |
1 files changed, 256 insertions, 0 deletions
diff --git a/accessible/base/AccEvent.cpp b/accessible/base/AccEvent.cpp new file mode 100644 index 0000000000..1d1b4386f8 --- /dev/null +++ b/accessible/base/AccEvent.cpp @@ -0,0 +1,256 @@ +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=2 et sw=2 tw=80: */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#include "AccEvent.h" + +#include "nsAccUtils.h" +#include "xpcAccEvents.h" +#include "States.h" +#include "TextRange.h" +#include "xpcAccessibleDocument.h" +#include "xpcAccessibleTextRange.h" + +#include "mozilla/dom/Selection.h" +#include "mozilla/dom/UserActivation.h" + +#include "nsComponentManagerUtils.h" +#include "nsIMutableArray.h" + +using namespace mozilla; +using namespace mozilla::a11y; + +static_assert(static_cast<bool>(eNoUserInput) == false && + static_cast<bool>(eFromUserInput) == true, + "EIsFromUserInput cannot be casted to bool"); + +//////////////////////////////////////////////////////////////////////////////// +// AccEvent +//////////////////////////////////////////////////////////////////////////////// + +//////////////////////////////////////////////////////////////////////////////// +// AccEvent constructors + +AccEvent::AccEvent(uint32_t aEventType, LocalAccessible* aAccessible, + EIsFromUserInput aIsFromUserInput, EEventRule aEventRule) + : mEventType(aEventType), mEventRule(aEventRule), mAccessible(aAccessible) { + if (aIsFromUserInput == eAutoDetect) { + mIsFromUserInput = dom::UserActivation::IsHandlingUserInput(); + } else { + mIsFromUserInput = aIsFromUserInput == eFromUserInput ? true : false; + } +} + +//////////////////////////////////////////////////////////////////////////////// +// AccEvent cycle collection + +NS_IMPL_CYCLE_COLLECTION_CLASS(AccEvent) + +NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(AccEvent) + NS_IMPL_CYCLE_COLLECTION_UNLINK(mAccessible) + if (AccTreeMutationEvent* tmEvent = downcast_accEvent(tmp)) { + tmEvent->SetNextEvent(nullptr); + tmEvent->SetPrevEvent(nullptr); + } +NS_IMPL_CYCLE_COLLECTION_UNLINK_END + +NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(AccEvent) + NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mAccessible) + if (AccTreeMutationEvent* tmEvent = downcast_accEvent(tmp)) { + CycleCollectionNoteChild(cb, tmEvent->NextEvent(), "mNext"); + CycleCollectionNoteChild(cb, tmEvent->PrevEvent(), "mPrevEvent"); + } +NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END + +//////////////////////////////////////////////////////////////////////////////// +//////////////////////////////////////////////////////////////////////////////// +// AccTextChangeEvent +//////////////////////////////////////////////////////////////////////////////// + +// Note: we pass in eAllowDupes to the base class because we don't support text +// events coalescence. We fire delayed text change events in DocAccessible but +// we continue to base the event off the accessible object rather than just the +// node. This means we won't try to create an accessible based on the node when +// we are ready to fire the event and so we will no longer assert at that point +// if the node was removed from the document. Either way, the AT won't work with +// a defunct accessible so the behaviour should be equivalent. +AccTextChangeEvent::AccTextChangeEvent(LocalAccessible* aAccessible, + int32_t aStart, + const nsAString& aModifiedText, + bool aIsInserted, + EIsFromUserInput aIsFromUserInput) + : AccEvent( + aIsInserted + ? static_cast<uint32_t>(nsIAccessibleEvent::EVENT_TEXT_INSERTED) + : static_cast<uint32_t>(nsIAccessibleEvent::EVENT_TEXT_REMOVED), + aAccessible, aIsFromUserInput, eAllowDupes), + mStart(aStart), + mIsInserted(aIsInserted), + mModifiedText(aModifiedText) { + // XXX We should use IsFromUserInput here, but that isn't always correct + // when the text change isn't related to content insertion or removal. + mIsFromUserInput = + mAccessible->State() & (states::FOCUSED | states::EDITABLE); +} + +//////////////////////////////////////////////////////////////////////////////// +// AccHideEvent +//////////////////////////////////////////////////////////////////////////////// + +AccHideEvent::AccHideEvent(LocalAccessible* aTarget, bool aNeedsShutdown) + : AccMutationEvent(::nsIAccessibleEvent::EVENT_HIDE, aTarget), + mNeedsShutdown(aNeedsShutdown) { + mNextSibling = mAccessible->LocalNextSibling(); + mPrevSibling = mAccessible->LocalPrevSibling(); +} + +//////////////////////////////////////////////////////////////////////////////// +// AccShowEvent +//////////////////////////////////////////////////////////////////////////////// + +//////////////////////////////////////////////////////////////////////////////// +// AccTextSelChangeEvent +//////////////////////////////////////////////////////////////////////////////// + +AccTextSelChangeEvent::AccTextSelChangeEvent(HyperTextAccessible* aTarget, + dom::Selection* aSelection, + int32_t aReason, + int32_t aGranularity) + : AccEvent(nsIAccessibleEvent::EVENT_TEXT_SELECTION_CHANGED, aTarget, + eAutoDetect, eCoalesceTextSelChange), + mSel(aSelection), + mReason(aReason), + mGranularity(aGranularity) {} + +AccTextSelChangeEvent::~AccTextSelChangeEvent() {} + +bool AccTextSelChangeEvent::IsCaretMoveOnly() const { + return mSel->RangeCount() == 1 && mSel->IsCollapsed() && + ((mReason & (nsISelectionListener::COLLAPSETOSTART_REASON | + nsISelectionListener::COLLAPSETOEND_REASON)) == 0); +} + +void AccTextSelChangeEvent::SelectionRanges( + nsTArray<TextRange>* aRanges) const { + TextRange::TextRangesFromSelection(mSel, aRanges); +} + +//////////////////////////////////////////////////////////////////////////////// +// AccSelChangeEvent +//////////////////////////////////////////////////////////////////////////////// + +AccSelChangeEvent::AccSelChangeEvent(LocalAccessible* aWidget, + LocalAccessible* aItem, + SelChangeType aSelChangeType) + : AccEvent(0, aItem, eAutoDetect, eCoalesceSelectionChange), + mWidget(aWidget), + mItem(aItem), + mSelChangeType(aSelChangeType), + mPreceedingCount(0), + mPackedEvent(nullptr) { + if (aSelChangeType == eSelectionAdd) { + if (mWidget->GetSelectedItem(1)) { + mEventType = nsIAccessibleEvent::EVENT_SELECTION_ADD; + } else { + mEventType = nsIAccessibleEvent::EVENT_SELECTION; + } + } else { + mEventType = nsIAccessibleEvent::EVENT_SELECTION_REMOVE; + } +} + +already_AddRefed<nsIAccessibleEvent> a11y::MakeXPCEvent(AccEvent* aEvent) { + DocAccessible* doc = aEvent->Document(); + LocalAccessible* acc = aEvent->GetAccessible(); + nsINode* node = acc->GetNode(); + bool fromUser = aEvent->IsFromUserInput(); + uint32_t type = aEvent->GetEventType(); + uint32_t eventGroup = aEvent->GetEventGroups(); + nsCOMPtr<nsIAccessibleEvent> xpEvent; + + if (eventGroup & (1 << AccEvent::eStateChangeEvent)) { + AccStateChangeEvent* sc = downcast_accEvent(aEvent); + bool extra = false; + uint32_t state = nsAccUtils::To32States(sc->GetState(), &extra); + xpEvent = new xpcAccStateChangeEvent(type, ToXPC(acc), ToXPCDocument(doc), + node, fromUser, state, extra, + sc->IsStateEnabled()); + return xpEvent.forget(); + } + + if (eventGroup & (1 << AccEvent::eTextChangeEvent)) { + AccTextChangeEvent* tc = downcast_accEvent(aEvent); + nsString text; + tc->GetModifiedText(text); + xpEvent = new xpcAccTextChangeEvent( + type, ToXPC(acc), ToXPCDocument(doc), node, fromUser, + tc->GetStartOffset(), tc->GetLength(), tc->IsTextInserted(), text); + return xpEvent.forget(); + } + + if (eventGroup & (1 << AccEvent::eHideEvent)) { + AccHideEvent* hideEvent = downcast_accEvent(aEvent); + xpEvent = new xpcAccHideEvent(type, ToXPC(acc), ToXPCDocument(doc), node, + fromUser, ToXPC(hideEvent->TargetParent()), + ToXPC(hideEvent->TargetNextSibling()), + ToXPC(hideEvent->TargetPrevSibling())); + return xpEvent.forget(); + } + + if (eventGroup & (1 << AccEvent::eCaretMoveEvent)) { + AccCaretMoveEvent* cm = downcast_accEvent(aEvent); + xpEvent = new xpcAccCaretMoveEvent( + type, ToXPC(acc), ToXPCDocument(doc), node, fromUser, + cm->GetCaretOffset(), cm->IsSelectionCollapsed(), cm->IsAtEndOfLine(), + cm->GetGranularity()); + return xpEvent.forget(); + } + + if (eventGroup & (1 << AccEvent::eTextSelChangeEvent)) { + AccTextSelChangeEvent* tsc = downcast_accEvent(aEvent); + AutoTArray<TextRange, 1> ranges; + tsc->SelectionRanges(&ranges); + + nsCOMPtr<nsIMutableArray> xpcRanges = + do_CreateInstance(NS_ARRAY_CONTRACTID); + uint32_t len = ranges.Length(); + for (uint32_t idx = 0; idx < len; idx++) { + xpcRanges->AppendElement(new xpcAccessibleTextRange(ranges[idx])); + } + + xpEvent = new xpcAccTextSelectionChangeEvent( + type, ToXPC(acc), ToXPCDocument(doc), node, fromUser, xpcRanges); + return xpEvent.forget(); + } + + if (eventGroup & (1 << AccEvent::eObjectAttrChangedEvent)) { + AccObjectAttrChangedEvent* oac = downcast_accEvent(aEvent); + nsString attribute; + oac->GetAttribute()->ToString(attribute); + xpEvent = new xpcAccObjectAttributeChangedEvent( + type, ToXPC(acc), ToXPCDocument(doc), node, fromUser, attribute); + return xpEvent.forget(); + } + + if (eventGroup & (1 << AccEvent::eScrollingEvent)) { + AccScrollingEvent* sa = downcast_accEvent(aEvent); + xpEvent = new xpcAccScrollingEvent( + type, ToXPC(acc), ToXPCDocument(doc), node, fromUser, sa->ScrollX(), + sa->ScrollY(), sa->MaxScrollX(), sa->MaxScrollY()); + return xpEvent.forget(); + } + + if (eventGroup & (1 << AccEvent::eAnnouncementEvent)) { + AccAnnouncementEvent* aa = downcast_accEvent(aEvent); + xpEvent = new xpcAccAnnouncementEvent(type, ToXPC(acc), ToXPCDocument(doc), + node, fromUser, aa->Announcement(), + aa->Priority()); + return xpEvent.forget(); + } + + xpEvent = + new xpcAccEvent(type, ToXPC(acc), ToXPCDocument(doc), node, fromUser); + return xpEvent.forget(); +} |