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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_VCL_MNEMONICENGINE_HXX
#define INCLUDED_VCL_MNEMONICENGINE_HXX
#include <vcl/dllapi.h>
#include <sal/config.h>
#include <sal/types.h>
#include <rtl/ustring.hxx>
#include <memory>
class KeyEvent;
namespace vcl
{
//= IMnemonicEntryList
/// callback for a MnemonicEngine
class SAL_NO_VTABLE VCL_DLLPUBLIC IMnemonicEntryList
{
public:
/** returns the first list entry for the mnemonic search
@return
a pointer which can be used to unuquely identify the entry.
The MenomonicEngine itself does not use this value, it
is only passed to other methods of this callback interface.
If this value is NULL, searching stops.
*/
virtual const void* FirstSearchEntry( OUString& _rEntryText ) const = 0;
/** returns the next list entry for the mnemonic search
@return
a pointer which can be used to unuquely identify the entry.
The MenomonicEngine itself does not use this value, it
is only passed to other methods of this callback interface.
If this value is NULL, searching stops.
If this value is the same as returned by the previous call
to FirstSearchEntry (i.e. you cycled
around), then searching stops, too.
*/
virtual const void* NextSearchEntry( const void* _pCurrentSearchEntry, OUString& _rEntryText ) const = 0;
/** "selects" a given entry.
Note: The semantics of "select" depends on your implementation. You
might actually really select the entry (in the sense of a selected
list box entry, for example), you might make it the current entry,
if your implementation supports this - whatever.
@param _pEntry
the entry to select. This is the return value of a previous call
to FirstSearchEntry or NextSearchEntry.
*/
virtual void SelectSearchEntry( const void* _pEntry ) = 0;
/** "executes" the current search entry, i.e. the one returned
in the previous NextSearchEntry call.
Note: The semantics of "execute" depends on your implementation. You
might even have a list of entries which cannot be executed at all.
This method is called after SelectSearchEntry,
if and only if the current entry's mnemonic is unambiguous.
For instance, imagine a list which has two entries with the same mnemonic
character, say "c". Now if the user presses <code>Alt-C</code>, the MnemonicEngine
will call SelectCurrentEntry as soon as it encounters
the first entry, but it'll never call ExecuteSearchEntry.
If, however, "c" is a unique mnemonic character in your entry list, then the
call of SelectSearchEntry will be followed by a
call to ExecuteSearchEntry.
This way, you can implement cyclic selection of entries: In
FirstSearchEntry, return the entry which was previously
selected, and in NextSearchEntry, internally cycle around
in your list. Then, multiple user inputs of <code>Alt-C</code> will
cycle through all entries with the mnemonic being "c".
@param _pEntry
the entry to select. This is the return value of a previous call
to FirstSearchEntry or NextSearchEntry.
*/
virtual void ExecuteSearchEntry( const void* _pEntry ) const = 0;
protected:
~IMnemonicEntryList() {}
};
//= MnemonicEngine
struct MnemonicEngine_Data;
class MnemonicEngine
{
::std::unique_ptr< MnemonicEngine_Data > m_pData;
public:
MnemonicEngine( IMnemonicEntryList& _rEntryList );
~MnemonicEngine();
/** handles a key event
If the key event denotes pressing an accelerator key, then the
entry list is searched for a matching entry. If such an entry is
found, IMnemonicEntryList::SelectSearchEntry
is called.
If the entry is the only one with the given mnemonic character, then
also IMnemonicEntryList::ExecuteSearchEntry
is called.
@return
if the key event has been handled, and should thus not be processed
further.
*/
bool HandleKeyEvent( const KeyEvent& _rKEvt );
};
} // namespace vcl
#endif // INCLUDED_VCL_MNEMONICENGINE_HXX
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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