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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 .
*/
#ifndef INCLUDED_SFX2_ITEMWRAPPER_HXX
#define INCLUDED_SFX2_ITEMWRAPPER_HXX
#include <sal/config.h>
#include <sfx2/dllapi.h>
#include <svl/eitem.hxx>
#include <svl/intitem.hxx>
class SfxItemSet;
namespace sfx {
// Helpers
class SFX2_DLLPUBLIC ItemWrapperHelper
{
public:
/** Returns the WID of the passed SID in the item set. */
static sal_uInt16 GetWhichId( const SfxItemSet& rItemSet, sal_uInt16 nSlot );
/** Returns true, if the passed item set supports the SID. */
static bool IsKnownItem( const SfxItemSet& rItemSet, sal_uInt16 nSlot );
/** Returns an item from an item set, if it is not in "don't know" state.
@return Pointer to item, or 0 if it has "don't know" state. */
static const SfxPoolItem* GetUniqueItem( const SfxItemSet& rItemSet, sal_uInt16 nSlot );
/** Returns the default item from the pool of the passed item set. */
static const SfxPoolItem& GetDefaultItem( const SfxItemSet& rItemSet, sal_uInt16 nSlot );
/** Removes an item from rDestSet, if it is default in rOldSet. */
static void RemoveDefaultItem( SfxItemSet& rDestSet, const SfxItemSet& rOldSet, sal_uInt16 nSlot );
};
// Item wrappers
/** Base class wrapping a single item.
Objects of this class store the SID of an item. Exchanging data with the
item is done with the virtual functions GetItemValue() and SetItemValue().
Derived classes implement these functions according to the item type they
work on.
The current tree of base classes/templates and standard item wrappers:
SingleItemWrapper< ItemT, ValueT >
|
+- ValueItemWrapper< ItemT, ValueT > [1]
| |
| +- BoolItemWrapper [1]
| +- UInt16ItemWrapper [1]
| +- Int32ItemWrapper [1]
|
+- IdentItemWrapper< ItemT > [1]
Notes:
[1] Standard wrappers ready to use.
See documentation of class ItemConnectionBase for more details.
*/
template< typename ItemT, typename ValueT >
class SingleItemWrapper
{
public:
typedef ItemT ItemType;
typedef ValueT ItemValueType;
typedef SingleItemWrapper< ItemT, ValueT > SingleItemWrapperType;
explicit SingleItemWrapper( sal_uInt16 nSlot ) : mnSlot( nSlot ) {}
virtual ~SingleItemWrapper() {}
/** Returns the SID this wrapper works on. */
sal_uInt16 GetSlotId() const { return mnSlot; }
/** Returns the item from an item set, if it is not in "don't know" state.
@descr Similar to ItemWrapperHelper::GetUniqueItem(), but works always
with the own SID and returns the correct item type.
@return Pointer to item, or 0 if it has "don't know" state. */
const ItemT* GetUniqueItem( const SfxItemSet& rItemSet ) const;
/** Returns the default item from the pool of the passed item set.
@descr Similar to ItemWrapperHelper::GetDefaultItem(), but works
always with the own SID and returns the correct item type. */
const ItemT& GetDefaultItem( const SfxItemSet& rItemSet ) const;
/** Derived classes return the value of the passed item. */
virtual ValueT GetItemValue( const ItemT& rItem ) const = 0;
/** Derived classes set the value at the passed item. */
virtual void SetItemValue( ItemT& rItem, ValueT aValue ) const = 0;
private:
sal_uInt16 mnSlot; /// The SID of this item wrapper.
};
/** An item wrapper usable for most types of items.
The item type must support the following functions:
- ValueT ItemT::GetValue() const
- void ItemT::SetValue( ValueT )
The template parameter InternalValueT can be used to specify the internal
value type of the item, if it differs from ValueT. This parameter has to be
used to prevent compiler warnings.
*/
template< typename ItemT, typename ValueT, typename InternalValueT = ValueT >
class ValueItemWrapper : public SingleItemWrapper< ItemT, ValueT >
{
public:
explicit ValueItemWrapper( sal_uInt16 nSlot ) :
SingleItemWrapper< ItemT, ValueT >( nSlot ) {}
virtual ValueT GetItemValue( const ItemT& rItem ) const SAL_OVERRIDE
{ return static_cast< ValueT >( rItem.GetValue() ); }
virtual void SetItemValue( ItemT& rItem, ValueT aValue ) const SAL_OVERRIDE
{ rItem.SetValue( static_cast< InternalValueT >( aValue ) ); }
};
typedef ValueItemWrapper< SfxBoolItem, sal_Bool > BoolItemWrapper;
typedef ValueItemWrapper< SfxUInt16Item, sal_uInt16 > UInt16ItemWrapper;
typedef ValueItemWrapper< SfxInt32Item, sal_Int32 > Int32ItemWrapper;
/** An item wrapper that uses the item itself as value. */
template< typename ItemT >
class IdentItemWrapper : public SingleItemWrapper< ItemT, const ItemT& >
{
public:
explicit IdentItemWrapper( sal_uInt16 nSlot ) :
SingleItemWrapper< ItemT, const ItemT& >( nSlot ) {}
virtual const ItemT& GetItemValue( const ItemT& rItem ) const SAL_OVERRIDE
{ return rItem; }
virtual void SetItemValue( ItemT& rItem, const ItemT& rValue ) const SAL_OVERRIDE
{ rItem = rValue; }
};
// *** Implementation of template functions ***
// Item wrappers
template< typename ItemT, typename ValueT >
const ItemT* SingleItemWrapper< ItemT, ValueT >::GetUniqueItem( const SfxItemSet& rItemSet ) const
{
return static_cast< const ItemT* >( ItemWrapperHelper::GetUniqueItem( rItemSet, mnSlot ) );
}
template< typename ItemT, typename ValueT >
const ItemT& SingleItemWrapper< ItemT, ValueT >::GetDefaultItem( const SfxItemSet& rItemSet ) const
{
return static_cast< const ItemT& >( ItemWrapperHelper::GetDefaultItem( rItemSet, mnSlot ) );
}
} // namespace sfx
#endif
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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