mirror of
https://github.com/rn10950/RetroZilla.git
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303 lines
9.9 KiB
C++
303 lines
9.9 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998-1999
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Pierre Phaneuf <pp@ludusdesign.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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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 "nsAutoPtr.h"
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PlaceholderTxn::PlaceholderTxn() : EditAggregateTxn(),
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mAbsorb(PR_TRUE),
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mForwarding(nsnull),
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mIMETextTxn(nsnull),
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mCommitted(PR_FALSE),
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mStartSel(nsnull),
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mEndSel(),
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mEditor(nsnull)
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{
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}
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PlaceholderTxn::~PlaceholderTxn()
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{
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delete mStartSel;
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}
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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_IMPL_QUERY_INTERFACE_INHERITED1(Class, Super, AdditionalInterface)
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NS_IMETHODIMP PlaceholderTxn::QueryInterface(REFNSIID aIID, void** aInstancePtr)
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{
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if (!aInstancePtr) return NS_ERROR_NULL_POINTER;
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if (aIID.Equals(NS_GET_IID(nsIAbsorbingTransaction))) {
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*aInstancePtr = (nsISupports*)(nsIAbsorbingTransaction*)(this);
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NS_ADDREF_THIS();
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return NS_OK;
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}
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if (aIID.Equals(NS_GET_IID(nsISupportsWeakReference))) {
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*aInstancePtr = (nsISupports*)(nsISupportsWeakReference*) this;
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NS_ADDREF_THIS();
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return NS_OK;
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}
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return EditAggregateTxn::QueryInterface(aIID, aInstancePtr);
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}
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NS_IMETHODIMP PlaceholderTxn::Init(nsIAtom *aName, nsSelectionState *aSelState, nsIEditor *aEditor)
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{
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if (!aEditor || !aSelState) return 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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if (NS_FAILED(res)) return res;
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if (!mStartSel) return NS_ERROR_NULL_POINTER;
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// now restore selection
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nsCOMPtr<nsISelection> selection;
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res = mEditor->GetSelection(getter_AddRefs(selection));
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if (NS_FAILED(res)) return res;
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if (!selection) return 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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if (NS_FAILED(res)) return res;
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// now restore selection
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nsCOMPtr<nsISelection> selection;
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res = mEditor->GetSelection(getter_AddRefs(selection));
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if (NS_FAILED(res)) return res;
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if (!selection) return 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, PRBool *aDidMerge)
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{
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if (!aDidMerge || !aTransaction) return NS_ERROR_NULL_POINTER;
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// set out param default value
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*aDidMerge=PR_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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if (!pTxn) return 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_QueryInterface(editTxn);
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// cant do_QueryInterface() above due to our broken transaction interfaces.
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// instead have to brute it below. ugh.
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editTxn->QueryInterface(NS_GET_IID(nsIAbsorbingTransaction), getter_AddRefs(plcTxn));
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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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nsRefPtr<IMETextTxn> otherTxn;
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if (NS_SUCCEEDED(aTransaction->QueryInterface(IMETextTxn::GetCID(), getter_AddRefs(otherTxn))) && otherTxn)
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{
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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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PRBool 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 commited 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 = PR_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 inital 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() == nsEditor::gTypingTxnName) ||
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(mName.get() == nsEditor::gIMETxnName) ||
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(mName.get() == nsEditor::gDeleteTxnName))
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&& !mCommitted )
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{
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nsCOMPtr<nsIAbsorbingTransaction> plcTxn;// = do_QueryInterface(editTxn);
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// can't do_QueryInterface() above due to our broken transaction interfaces.
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// instead have to brute it below. ugh.
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editTxn->QueryInterface(NS_GET_IID(nsIAbsorbingTransaction), getter_AddRefs(plcTxn));
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if (plcTxn)
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{
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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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PRBool isSame;
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plcTxn->StartSelectionEquals(&mEndSel, &isSame);
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if (isSame)
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{
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mAbsorb = PR_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 = PR_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, PRBool *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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if (!aResult || !aSelState) return NS_ERROR_NULL_POINTER;
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if (!mStartSel->IsCollapsed() || !aSelState->IsCollapsed())
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{
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*aResult = PR_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 = PR_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 = PR_TRUE;
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return NS_OK;
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}
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NS_IMETHODIMP PlaceholderTxn::RememberEndingSelection()
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{
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nsCOMPtr<nsISelection> selection;
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nsresult res = mEditor->GetSelection(getter_AddRefs(selection));
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if (NS_FAILED(res)) return res;
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if (!selection) return NS_ERROR_NULL_POINTER;
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return mEndSel.SaveSelection(selection);
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}
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