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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 "mozilla/a11y/SelectionManager.h"
#include "DocAccessible-inl.h"
#include "HyperTextAccessible.h"
#include "HyperTextAccessible-inl.h"
#include "nsAccessibilityService.h"
#include "nsAccUtils.h"
#include "nsCoreUtils.h"
#include "nsEventShell.h"
#include "nsFrameSelection.h"
#include "nsIAccessibleTypes.h"
#include "nsIDOMDocument.h"
#include "nsIPresShell.h"
#include "mozilla/dom/Selection.h"
#include "mozilla/dom/Element.h"
using namespace mozilla;
using namespace mozilla::a11y;
using mozilla::dom::Selection;
struct mozilla::a11y::SelData final
{
SelData(Selection* aSel, int32_t aReason) :
mSel(aSel), mReason(aReason) {}
RefPtr<Selection> mSel;
int16_t mReason;
NS_INLINE_DECL_REFCOUNTING(SelData)
private:
// Private destructor, to discourage deletion outside of Release():
~SelData() {}
};
SelectionManager::SelectionManager() :
mCaretOffset(-1), mAccWithCaret(nullptr)
{
}
void
SelectionManager::ClearControlSelectionListener()
{
// Remove 'this' registered as selection listener for the normal selection.
nsCOMPtr<nsISelection> normalSel = do_QueryReferent(mCurrCtrlNormalSel);
if (normalSel) {
normalSel->AsSelection()->RemoveSelectionListener(this);
mCurrCtrlNormalSel = nullptr;
}
// Remove 'this' registered as selection listener for the spellcheck
// selection.
nsCOMPtr<nsISelection> spellSel = do_QueryReferent(mCurrCtrlSpellSel);
if (spellSel) {
spellSel->AsSelection()->RemoveSelectionListener(this);
mCurrCtrlSpellSel = nullptr;
}
}
void
SelectionManager::SetControlSelectionListener(dom::Element* aFocusedElm)
{
// When focus moves such that the caret is part of a new frame selection
// this removes the old selection listener and attaches a new one for
// the current focus.
ClearControlSelectionListener();
nsIFrame* controlFrame = aFocusedElm->GetPrimaryFrame();
if (!controlFrame)
return;
const nsFrameSelection* frameSel = controlFrame->GetConstFrameSelection();
NS_ASSERTION(frameSel, "No frame selection for focused element!");
if (!frameSel)
return;
// Register 'this' as selection listener for the normal selection.
nsCOMPtr<nsISelection> normalSel = frameSel->GetSelection(SelectionType::eNormal);
normalSel->AsSelection()->AddSelectionListener(this);
mCurrCtrlNormalSel = do_GetWeakReference(normalSel);
// Register 'this' as selection listener for the spell check selection.
nsCOMPtr<nsISelection> spellSel = frameSel->GetSelection(SelectionType::eSpellCheck);
spellSel->AsSelection()->AddSelectionListener(this);
mCurrCtrlSpellSel = do_GetWeakReference(spellSel);
}
void
SelectionManager::AddDocSelectionListener(nsIPresShell* aPresShell)
{
const nsFrameSelection* frameSel = aPresShell->ConstFrameSelection();
// Register 'this' as selection listener for the normal selection.
Selection* normalSel = frameSel->GetSelection(SelectionType::eNormal);
normalSel->AddSelectionListener(this);
// Register 'this' as selection listener for the spell check selection.
Selection* spellSel = frameSel->GetSelection(SelectionType::eSpellCheck);
spellSel->AddSelectionListener(this);
}
void
SelectionManager::RemoveDocSelectionListener(nsIPresShell* aPresShell)
{
const nsFrameSelection* frameSel = aPresShell->ConstFrameSelection();
// Remove 'this' registered as selection listener for the normal selection.
Selection* normalSel = frameSel->GetSelection(SelectionType::eNormal);
normalSel->RemoveSelectionListener(this);
// Remove 'this' registered as selection listener for the spellcheck
// selection.
Selection* spellSel = frameSel->GetSelection(SelectionType::eSpellCheck);
spellSel->RemoveSelectionListener(this);
}
void
SelectionManager::ProcessTextSelChangeEvent(AccEvent* aEvent)
{
// Fire selection change event if it's not pure caret-move selection change,
// i.e. the accessible has or had not collapsed selection.
AccTextSelChangeEvent* event = downcast_accEvent(aEvent);
if (!event->IsCaretMoveOnly())
nsEventShell::FireEvent(aEvent);
// Fire caret move event if there's a caret in the selection.
nsINode* caretCntrNode =
nsCoreUtils::GetDOMNodeFromDOMPoint(event->mSel->GetFocusNode(),
event->mSel->FocusOffset());
if (!caretCntrNode)
return;
HyperTextAccessible* caretCntr = nsAccUtils::GetTextContainer(caretCntrNode);
NS_ASSERTION(caretCntr,
"No text container for focus while there's one for common ancestor?!");
if (!caretCntr)
return;
Selection* selection = caretCntr->DOMSelection();
// XXX Sometimes we can't get a selection for caretCntr, in that case assume
// event->mSel is correct.
if (!selection)
selection = event->mSel;
mCaretOffset = caretCntr->DOMPointToOffset(selection->GetFocusNode(),
selection->FocusOffset());
mAccWithCaret = caretCntr;
if (mCaretOffset != -1) {
RefPtr<AccCaretMoveEvent> caretMoveEvent =
new AccCaretMoveEvent(caretCntr, mCaretOffset, aEvent->FromUserInput());
nsEventShell::FireEvent(caretMoveEvent);
}
}
NS_IMETHODIMP
SelectionManager::NotifySelectionChanged(nsIDOMDocument* aDOMDocument,
nsISelection* aSelection,
int16_t aReason)
{
if (NS_WARN_IF(!aDOMDocument) || NS_WARN_IF(!aSelection)) {
return NS_ERROR_INVALID_ARG;
}
nsCOMPtr<nsIDocument> documentNode(do_QueryInterface(aDOMDocument));
DocAccessible* document = GetAccService()->GetDocAccessible(documentNode);
#ifdef A11Y_LOG
if (logging::IsEnabled(logging::eSelection))
logging::SelChange(aSelection, document, aReason);
#endif
if (document) {
// Selection manager has longer lifetime than any document accessible,
// so that we are guaranteed that the notification is processed before
// the selection manager is destroyed.
RefPtr<SelData> selData =
new SelData(aSelection->AsSelection(), aReason);
document->HandleNotification<SelectionManager, SelData>
(this, &SelectionManager::ProcessSelectionChanged, selData);
}
return NS_OK;
}
void
SelectionManager::ProcessSelectionChanged(SelData* aSelData)
{
Selection* selection = aSelData->mSel;
if (!selection->GetPresShell())
return;
const nsRange* range = selection->GetAnchorFocusRange();
nsINode* cntrNode = nullptr;
if (range)
cntrNode = range->GetCommonAncestor();
if (!cntrNode) {
cntrNode = selection->GetFrameSelection()->GetAncestorLimiter();
if (!cntrNode) {
cntrNode = selection->GetPresShell()->GetDocument();
NS_ASSERTION(aSelData->mSel->GetPresShell()->ConstFrameSelection() == selection->GetFrameSelection(),
"Wrong selection container was used!");
}
}
HyperTextAccessible* text = nsAccUtils::GetTextContainer(cntrNode);
if (!text) {
NS_NOTREACHED("We must reach document accessible implementing text interface!");
return;
}
if (selection->GetType() == SelectionType::eNormal) {
RefPtr<AccEvent> event =
new AccTextSelChangeEvent(text, selection, aSelData->mReason);
text->Document()->FireDelayedEvent(event);
} else if (selection->GetType() == SelectionType::eSpellCheck) {
// XXX: fire an event for container accessible of the focus/anchor range
// of the spelcheck selection.
text->Document()->FireDelayedEvent(nsIAccessibleEvent::EVENT_TEXT_ATTRIBUTE_CHANGED,
text);
}
}
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