mirror of
https://github.com/classilla/tenfourfox.git
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263 lines
7.8 KiB
C++
263 lines
7.8 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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 "PlaceholderTxn.h"
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#include "nsEditor.h"
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#include "IMETextTxn.h"
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#include "nsGkAtoms.h"
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#include "mozilla/dom/Selection.h"
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#include "nsQueryObject.h"
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using namespace mozilla;
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using namespace mozilla::dom;
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PlaceholderTxn::PlaceholderTxn() : EditAggregateTxn(),
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mAbsorb(true),
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mForwarding(nullptr),
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mIMETextTxn(nullptr),
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mCommitted(false),
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mStartSel(nullptr),
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mEndSel(),
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mEditor(nullptr)
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{
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}
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PlaceholderTxn::~PlaceholderTxn()
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{
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}
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NS_IMPL_CYCLE_COLLECTION_CLASS(PlaceholderTxn)
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NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(PlaceholderTxn,
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EditAggregateTxn)
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tmp->mStartSel->DoUnlink();
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tmp->mEndSel.DoUnlink();
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NS_IMPL_CYCLE_COLLECTION_UNLINK_END
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(PlaceholderTxn,
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EditAggregateTxn)
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tmp->mStartSel->DoTraverse(cb);
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tmp->mEndSel.DoTraverse(cb);
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
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NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(PlaceholderTxn)
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NS_INTERFACE_MAP_ENTRY(nsIAbsorbingTransaction)
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NS_INTERFACE_MAP_ENTRY(nsISupportsWeakReference)
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NS_INTERFACE_MAP_END_INHERITING(EditAggregateTxn)
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NS_IMPL_ADDREF_INHERITED(PlaceholderTxn, EditAggregateTxn)
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NS_IMPL_RELEASE_INHERITED(PlaceholderTxn, EditAggregateTxn)
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NS_IMETHODIMP
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PlaceholderTxn::Init(nsIAtom* aName, nsSelectionState* aSelState,
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nsEditor* aEditor)
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{
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NS_ENSURE_TRUE(aEditor && aSelState, NS_ERROR_NULL_POINTER);
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mName = aName;
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mStartSel = aSelState;
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mEditor = aEditor;
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return NS_OK;
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}
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NS_IMETHODIMP PlaceholderTxn::DoTransaction(void)
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{
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return NS_OK;
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}
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NS_IMETHODIMP PlaceholderTxn::UndoTransaction(void)
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{
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// undo txns
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nsresult res = EditAggregateTxn::UndoTransaction();
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NS_ENSURE_SUCCESS(res, res);
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NS_ENSURE_TRUE(mStartSel, NS_ERROR_NULL_POINTER);
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// now restore selection
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RefPtr<Selection> selection = mEditor->GetSelection();
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NS_ENSURE_TRUE(selection, NS_ERROR_NULL_POINTER);
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return mStartSel->RestoreSelection(selection);
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}
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NS_IMETHODIMP PlaceholderTxn::RedoTransaction(void)
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{
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// redo txns
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nsresult res = EditAggregateTxn::RedoTransaction();
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NS_ENSURE_SUCCESS(res, res);
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// now restore selection
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RefPtr<Selection> selection = mEditor->GetSelection();
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NS_ENSURE_TRUE(selection, NS_ERROR_NULL_POINTER);
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return mEndSel.RestoreSelection(selection);
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}
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NS_IMETHODIMP PlaceholderTxn::Merge(nsITransaction *aTransaction, bool *aDidMerge)
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{
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NS_ENSURE_TRUE(aDidMerge && aTransaction, NS_ERROR_NULL_POINTER);
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// set out param default value
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*aDidMerge=false;
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if (mForwarding)
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{
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NS_NOTREACHED("tried to merge into a placeholder that was in forwarding mode!");
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return NS_ERROR_FAILURE;
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}
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// check to see if aTransaction is one of the editor's
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// private transactions. If not, we want to avoid merging
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// the foreign transaction into our placeholder since we
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// don't know what it does.
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nsCOMPtr<nsPIEditorTransaction> pTxn = do_QueryInterface(aTransaction);
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NS_ENSURE_TRUE(pTxn, NS_OK); // it's foreign so just bail!
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EditTxn *editTxn = (EditTxn*)aTransaction; //XXX: hack, not safe! need nsIEditTransaction!
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// determine if this incoming txn is a placeholder txn
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nsCOMPtr<nsIAbsorbingTransaction> plcTxn = do_QueryObject(editTxn);
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// we are absorbing all txn's if mAbsorb is lit.
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if (mAbsorb)
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{
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RefPtr<IMETextTxn> otherTxn = do_QueryObject(aTransaction);
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if (otherTxn) {
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// special handling for IMETextTxn's: they need to merge with any previous
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// IMETextTxn in this placeholder, if possible.
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if (!mIMETextTxn)
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{
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// this is the first IME txn in the placeholder
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mIMETextTxn =otherTxn;
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AppendChild(editTxn);
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}
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else
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{
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bool didMerge;
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mIMETextTxn->Merge(otherTxn, &didMerge);
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if (!didMerge)
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{
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// it wouldn't merge. Earlier IME txn is already committed and will
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// not absorb further IME txns. So just stack this one after it
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// and remember it as a candidate for further merges.
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mIMETextTxn =otherTxn;
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AppendChild(editTxn);
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}
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}
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}
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else if (!plcTxn) // see bug 171243: just drop incoming placeholders on the floor.
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{ // their children will be swallowed by this preexisting one.
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AppendChild(editTxn);
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}
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*aDidMerge = true;
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// RememberEndingSelection();
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// efficiency hack: no need to remember selection here, as we haven't yet
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// finished the initial batch and we know we will be told when the batch ends.
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// we can remeber the selection then.
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}
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else
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{ // merge typing or IME or deletion transactions if the selection matches
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if (((mName.get() == nsGkAtoms::TypingTxnName) ||
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(mName.get() == nsGkAtoms::IMETxnName) ||
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(mName.get() == nsGkAtoms::DeleteTxnName))
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&& !mCommitted )
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{
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nsCOMPtr<nsIAbsorbingTransaction> plcTxn = do_QueryObject(editTxn);
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if (plcTxn) {
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nsCOMPtr<nsIAtom> atom;
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plcTxn->GetTxnName(getter_AddRefs(atom));
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if (atom && (atom == mName))
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{
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// check if start selection of next placeholder matches
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// end selection of this placeholder
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bool isSame;
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plcTxn->StartSelectionEquals(&mEndSel, &isSame);
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if (isSame)
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{
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mAbsorb = true; // we need to start absorbing again
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plcTxn->ForwardEndBatchTo(this);
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// AppendChild(editTxn);
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// see bug 171243: we don't need to merge placeholders
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// into placeholders. We just reactivate merging in the pre-existing
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// placeholder and drop the new one on the floor. The EndPlaceHolderBatch()
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// call on the new placeholder will be forwarded to this older one.
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RememberEndingSelection();
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*aDidMerge = true;
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}
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}
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}
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}
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}
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return NS_OK;
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}
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NS_IMETHODIMP PlaceholderTxn::GetTxnDescription(nsAString& aString)
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{
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aString.AssignLiteral("PlaceholderTxn: ");
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if (mName)
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{
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nsAutoString name;
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mName->ToString(name);
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aString += name;
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}
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return NS_OK;
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}
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NS_IMETHODIMP PlaceholderTxn::GetTxnName(nsIAtom **aName)
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{
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return GetName(aName);
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}
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NS_IMETHODIMP PlaceholderTxn::StartSelectionEquals(nsSelectionState *aSelState, bool *aResult)
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{
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// determine if starting selection matches the given selection state.
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// note that we only care about collapsed selections.
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NS_ENSURE_TRUE(aResult && aSelState, NS_ERROR_NULL_POINTER);
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if (!mStartSel->IsCollapsed() || !aSelState->IsCollapsed())
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{
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*aResult = false;
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return NS_OK;
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}
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*aResult = mStartSel->IsEqual(aSelState);
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return NS_OK;
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}
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NS_IMETHODIMP PlaceholderTxn::EndPlaceHolderBatch()
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{
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mAbsorb = false;
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if (mForwarding)
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{
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nsCOMPtr<nsIAbsorbingTransaction> plcTxn = do_QueryReferent(mForwarding);
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if (plcTxn) plcTxn->EndPlaceHolderBatch();
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}
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// remember our selection state.
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return RememberEndingSelection();
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}
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NS_IMETHODIMP PlaceholderTxn::ForwardEndBatchTo(nsIAbsorbingTransaction *aForwardingAddress)
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{
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mForwarding = do_GetWeakReference(aForwardingAddress);
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return NS_OK;
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}
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NS_IMETHODIMP PlaceholderTxn::Commit()
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{
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mCommitted = true;
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return NS_OK;
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}
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nsresult PlaceholderTxn::RememberEndingSelection()
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{
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RefPtr<Selection> selection = mEditor->GetSelection();
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NS_ENSURE_TRUE(selection, NS_ERROR_NULL_POINTER);
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mEndSel.SaveSelection(selection);
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return NS_OK;
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}
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