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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* 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/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#include <svx/sdrundomanager.hxx>
#include <svx/svdundo.hxx>
#include <sfx2/objsh.hxx>
#include <svl/hint.hxx>
SdrUndoManager::SdrUndoManager()
: EditUndoManager(20 /*nMaxUndoActionCount*/)
, mpLastUndoActionBeforeTextEdit(nullptr)
, mnRedoActionCountBeforeTextEdit(0)
, mbEndTextEditTriggeredFromUndo(false)
, m_pDocSh(nullptr)
{
}
SdrUndoManager::~SdrUndoManager() {}
bool SdrUndoManager::Undo()
{
if (isTextEditActive())
{
bool bRetval(false);
// we are in text edit mode
if (GetUndoActionCount() && mpLastUndoActionBeforeTextEdit != GetUndoAction())
{
// there is an undo action for text edit, trigger it
bRetval = EditUndoManager::Undo();
}
else
{
// no more text edit undo, end text edit
mbEndTextEditTriggeredFromUndo = true;
maEndTextEditHdl.Call(this);
mbEndTextEditTriggeredFromUndo = false;
}
return bRetval;
}
else
{
// no undo triggered up to now, trigger local one
return SfxUndoManager::Undo();
}
}
bool SdrUndoManager::Redo()
{
bool bRetval(false);
bool bClearRedoStack(false);
if (isTextEditActive())
{
// we are in text edit mode
bRetval = EditUndoManager::Redo();
}
if (!bRetval)
{
// Check if the current and thus to-be undone UndoAction is a SdrUndoDiagramModelData action
const bool bCurrentIsDiagramChange(
GetRedoActionCount()
&& nullptr != dynamic_cast<SdrUndoDiagramModelData*>(GetRedoAction()));
// no redo triggered up to now, trigger local one
bRetval = SfxUndoManager::Redo();
// it was a SdrUndoDiagramModelData action and we have more Redo actions
if (bCurrentIsDiagramChange && GetRedoActionCount())
{
const bool bNextIsDiagramChange(
nullptr != dynamic_cast<SdrUndoDiagramModelData*>(GetRedoAction()));
// We have more Redo-actions and the 'next' one to be executed is *not* a
// SdrUndoDiagramModelData-action. This means that the already executed
// one had done a re-Layout/Re-create of the Diagram XShape/SdrObject
// representation based on the restored Diagram ModelData. When the next
// Redo action is something else (and thus will not itself re-create
// XShapes/SdrShapes) it may be that it is an UnGroup/Delete where a former
// as-content-of-Diagram created XShape/SdrShape is referenced, an action
// that references a XShape/SdrShape by pointer/reference. That
// pointer/reference *cannot* be valid anymore (now).
// The problem here is that Undo/Redo actions historically reference
// XShapes/SdrShapes by pointer/reference, e.g. deleting means: remove
// from an SdrObjList and add to an Undo action. I is *not*
// address/incarnation-invariant in the sense to remember e.g. to
// remove the Nth object in the list (that would work).
// It might be possible to solve/correct this better, but since it's
// a rare corner case just avoid the possible crash when continuing Redos
// by clearing the Redo-Stack here as a consequence
bClearRedoStack = !bNextIsDiagramChange;
}
}
if (bClearRedoStack)
{
// clear Redo-Stack (explanation see above)
ClearRedo();
}
return bRetval;
}
void SdrUndoManager::Clear()
{
if (isTextEditActive())
{
while (GetUndoActionCount() && mpLastUndoActionBeforeTextEdit != GetUndoAction())
{
RemoveLastUndoAction();
}
// urgently needed: RemoveLastUndoAction does NOT correct the Redo stack by itself (!)
ClearRedo();
}
else
{
// call parent
EditUndoManager::Clear();
}
}
void SdrUndoManager::SetEndTextEditHdl(const Link<SdrUndoManager*, void>& rLink)
{
maEndTextEditHdl = rLink;
if (isTextEditActive())
{
// text edit start, remember last non-textedit action for later cleanup
mpLastUndoActionBeforeTextEdit = GetUndoActionCount() ? GetUndoAction() : nullptr;
mnRedoActionCountBeforeTextEdit = GetRedoActionCount();
}
else
{
// text edit ends, pop all textedit actions up to the remembered non-textedit action from the start
// to set back the UndoManager to the state before text edit started. If that action is already gone
// (due to being removed from the undo stack in the meantime), all need to be removed anyways
while (GetUndoActionCount() && mpLastUndoActionBeforeTextEdit != GetUndoAction())
{
RemoveLastUndoAction();
}
// urgently needed: RemoveLastUndoAction does NOT correct the Redo stack by itself (!)
ClearRedo();
// forget marker again
mpLastUndoActionBeforeTextEdit = nullptr;
mnRedoActionCountBeforeTextEdit = 0;
}
}
bool SdrUndoManager::isTextEditActive() const { return maEndTextEditHdl.IsSet(); }
void SdrUndoManager::SetDocShell(SfxObjectShell* pDocShell) { m_pDocSh = pDocShell; }
void SdrUndoManager::EmptyActionsChanged()
{
if (m_pDocSh)
{
m_pDocSh->Broadcast(SfxHint(SfxHintId::DocumentRepair));
}
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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