author | hgs |
Mon, 12 Jul 2010 14:38:26 +0800 | |
changeset 45 | 662fa7de7023 |
parent 0 | 1fb32624e06b |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2000-2009 Nokia Corporation and/or its subsidiary(-ies). |
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* All rights reserved. |
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* This component and the accompanying materials are made available |
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* under the terms of "Eclipse Public License v1.0" |
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* which accompanies this distribution, and is available |
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* at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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* |
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* Initial Contributors: |
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* Nokia Corporation - initial contribution. |
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* |
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* Contributors: |
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* |
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* Description: |
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* |
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*/ |
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#ifndef EDITORUNDO_H_ |
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#define EDITORUNDO_H_ |
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#include "unified_editor.h" |
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namespace UndoSystem |
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/** |
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@internalTechnology |
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*/ |
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{ |
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class CCommandManager; |
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class MNotUndoableGatekeeper; |
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} |
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class CEditorCommandFactory; |
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/** |
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MUnifiedEditor decorator that adds undo functionality. |
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It passes commands transparently to the editor it is constructed upon, while |
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storing the operations so that they can be undone and redone. Calling a |
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non-const method of MUnifiedEditor wipes all 'Redo' operations. |
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The undo and redo operations are only guaranteed to be accurate if the |
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underlying editor satisfies certain conditions. |
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@since App-frameworks6.1 |
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@internalAll |
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*/ |
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class CEditorWithUndo : public CBase, |
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public MUnifiedEditor, |
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private MUnifiedEditor::MStyleSupport, |
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private MUnifiedEditor::MPictureSupport, |
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private MUnifiedEditor::MClipboardSupport |
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{ |
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public: |
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~CEditorWithUndo(); |
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/** |
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* Creates a CEditorWithUndo. It does not own the aEditor. |
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*/ |
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IMPORT_C static CEditorWithUndo* NewL(MUnifiedEditor& aEditor); |
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/** |
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* Creates a CEditorWithUndo, using the aSharedUndoSystem. This allows |
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* many objects to stay in synchronization when each is accessed |
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* seperately. |
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* The aEditor is not owned. |
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*/ |
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IMPORT_C static CEditorWithUndo* NewL(MUnifiedEditor& aEditor, |
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UndoSystem::CCommandManager* aSharedUndoSystem); |
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/** |
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* Undoes one operation or batch of operations. If one operation in the |
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* middle of a batch leaves, this function will leave, but the underlying |
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* editor will not necessarily be in the same state as it was in before |
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* the call. However, all operations will still be stored, and so the |
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* previous state is still recoverable with a call to RedoL() or a |
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* further call to UndoL will complete the operation (resource acquisition |
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* permitting). |
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*/ |
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IMPORT_C void UndoL(); |
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/** |
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* Redoes one operation or batch of operations. If one operation in the |
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* middle of a batch leaves, this function will leave, but the underlying |
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* editor will not necessarily be in the same state as it was in before |
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* the call. However, all operations will still be stored, and so the |
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* previous state is still recoverable with a call to UndoL() or a |
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* further call to RedoL will complete the operation (resource acquisition |
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* permitting). |
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*/ |
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IMPORT_C void RedoL(); |
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/** |
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* Returns ETrue iff UndoL() would have an effect |
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*/ |
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IMPORT_C TBool CanUndo() const; |
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/** |
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* Returns ETrue iff RedoL() would have an effect |
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*/ |
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IMPORT_C TBool CanRedo() const; |
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/** |
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* Wipes all undo and redo operations |
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*/ |
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IMPORT_C void ResetUndo(); |
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/** |
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* Sets limits on the 'undo depth'. This is the numbet of times that |
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* successive calls to UndoL() have an effect. When a depth of |
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* aMaxItems is reached, the undo depth is reset to aMinItems. |
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*/ |
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IMPORT_C void SetMaxItems(TInt aMaxItems); |
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/** |
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* Sets a gatekeper for the undo system. This will be called whenever an |
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* operation is attempted that cannot be undone for any reason. |
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* The gatekeeper therefore has an oportunity to suppress execution and |
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* keep the current undo operations stored. |
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* NULL may be passed to restore default behaviour. |
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* Returns the old gatekeeper. |
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*/ |
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IMPORT_C UndoSystem::MNotUndoableGatekeeper* |
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SetGatekeeper(UndoSystem::MNotUndoableGatekeeper*); |
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116 |
|
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// From MUnifiedEditor |
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MTmOptionalInterface* Interface(TUint aId); |
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void InsertTextL(TInt aPos, const TDesC& aText, const TDesC* aStyle, |
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const TTmCharFormatLayer*, const RTmParFormatLayer*); |
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void DeleteTextL(TInt aPos,TInt aLength); |
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void SetBaseFormatL(const TTmCharFormat&, const RTmParFormat&); |
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void SetCharFormatL(TInt aPos, TInt aLength, const TTmCharFormatLayer&); |
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void SetParFormatL(TInt aPos, TInt aLength, const RTmParFormatLayer&); |
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void DeleteCharFormatL(TInt aPos, TInt aLength); |
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void DeleteParFormatL(TInt aPos, TInt aLength); |
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TInt DocumentLength() const; |
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void GetText(TInt aPos, TPtrC& aText) const; |
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void GetBaseFormatL(TTmCharFormat&, RTmParFormat&) const; |
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void GetCharFormat(TInt aPos, TFormatLevel aLevel, |
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TTmCharFormatLayer& aFormat,TInt& aRunLength) const; |
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void GetParFormatL(TInt aPos, TFormatLevel aLevel, |
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RTmParFormatLayer& aFormat, TInt& aRunLength) const; |
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134 |
|
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private: |
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// from MStyleSupport |
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TInt CreateStyleL(const RTmStyle&); |
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TInt ChangeStyleL(const RTmStyle&); |
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TInt SetStyleL(TInt aPos, TInt aLength, const TDesC&); |
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TInt RenameStyleL(const TDesC& aOldName, const TDesC& aNewName); |
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TInt DeleteStyleL(const TDesC& aName); |
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TInt StyleCount() const; |
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void GetStyle(TInt aPos, TPtrC& aName, TInt& aRunLength) const; |
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TInt GetStyleByNameL(const TDesC& aName, RTmStyle&) const; |
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TInt GetStyleByIndexL(TInt aIndex, RTmStyle&) const; |
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// from MPictureSupport |
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void InsertPictureL(TInt aPos, const TPictureHeader&); |
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void DropPictureL(TInt aPos); |
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void Picture(TInt aPos, TPictureHeader&) const; |
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// from MClipboardSupport |
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void CopyToStoreL(CStreamStore& aStore, CStreamDictionary& aDictionary, |
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TInt aPos, TInt aLength) const; |
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void PasteFromStoreL(const CStreamStore& aStore, |
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const CStreamDictionary& aDictionary, TInt aPos); |
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CEditorWithUndo(); |
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void ConstructL(MUnifiedEditor& aEditorBasedOn, |
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UndoSystem::CCommandManager* aSharedUndoSystem); |
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CEditorCommandFactory* iFactory; |
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MUnifiedEditor* iBaseEditor; |
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UndoSystem::CCommandManager* iCommandManager; |
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}; |
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#endif // EDITORUNDO_H_ |