LCOV - code coverage report
Current view: top level - include/vcl - mnemonicengine.hxx (source / functions) Hit Total Coverage
Test: commit c8344322a7af75b84dd3ca8f78b05543a976dfd5 Lines: 2 2 100.0 %
Date: 2015-06-13 12:38:46 Functions: 2 2 100.0 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
       2             : /*
       3             :  * This file is part of the LibreOffice project.
       4             :  *
       5             :  * This Source Code Form is subject to the terms of the Mozilla Public
       6             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       7             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
       8             :  *
       9             :  * This file incorporates work covered by the following license notice:
      10             :  *
      11             :  *   Licensed to the Apache Software Foundation (ASF) under one or more
      12             :  *   contributor license agreements. See the NOTICE file distributed
      13             :  *   with this work for additional information regarding copyright
      14             :  *   ownership. The ASF licenses this file to you under the Apache
      15             :  *   License, Version 2.0 (the "License"); you may not use this file
      16             :  *   except in compliance with the License. You may obtain a copy of
      17             :  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
      18             :  */
      19             : 
      20             : #ifndef INCLUDED_VCL_MNEMONICENGINE_HXX
      21             : #define INCLUDED_VCL_MNEMONICENGINE_HXX
      22             : 
      23             : #include <vcl/dllapi.h>
      24             : 
      25             : #include <sal/config.h>
      26             : #include <sal/types.h>
      27             : #include <rtl/ustring.hxx>
      28             : 
      29             : #include <memory>
      30             : 
      31             : class KeyEvent;
      32             : 
      33             : 
      34             : namespace vcl
      35             : {
      36             : 
      37             : 
      38             : 
      39             :     //= IMnemonicEntryList
      40             : 
      41             :     /// callback for a MnemonicEngine
      42          28 :     class SAL_NO_VTABLE VCL_DLLPUBLIC IMnemonicEntryList
      43             :     {
      44             :     public:
      45             :         /** returns the first list entry for the mnemonic search
      46             : 
      47             :             @return
      48             :                 a pointer which can be used to unuquely identify the entry.
      49             :                 The MenomonicEngine itself does not use this value, it
      50             :                 is only passed to other methods of this callback interface.
      51             : 
      52             :                 If this value is NULL, searching stops.
      53             :         */
      54             :         virtual const void* FirstSearchEntry( OUString& _rEntryText ) const = 0;
      55             : 
      56             :         /** returns the next list entry for the mnemonic search
      57             : 
      58             :             @return
      59             :                 a pointer which can be used to unuquely identify the entry.
      60             :                 The MenomonicEngine itself does not use this value, it
      61             :                 is only passed to other methods of this callback interface.
      62             : 
      63             :                 If this value is NULL, searching stops.
      64             : 
      65             :                 If this value is the same as returned by the previous call
      66             :                 to FirstSearchEntry (i.e. you cycled
      67             :                 around), then searching stops, too.
      68             :         */
      69             :         virtual const void* NextSearchEntry( const void* _pCurrentSearchEntry, OUString& _rEntryText ) const = 0;
      70             : 
      71             :         /** "selects" a given entry.
      72             : 
      73             :             Note: The semantics of "select" depends on your implementation. You
      74             :             might actually really select the entry (in the sense of a selected
      75             :             list box entry, for example), you might make it the current entry,
      76             :             if your implementation supports this - whatever.
      77             : 
      78             :             @param _pEntry
      79             :                 the entry to select. This is the return value of a previous call
      80             :                 to FirstSearchEntry or NextSearchEntry.
      81             :         */
      82             :         virtual void    SelectSearchEntry( const void* _pEntry ) = 0;
      83             : 
      84             :         /** "executes" the current search entry, i.e. the one returned
      85             :             in the previous NextSearchEntry call.
      86             : 
      87             :             Note: The semantics of "execute" depends on your implementation. You
      88             :             might even have a list of entries which cannot be executed at all.
      89             : 
      90             :             This method is called after SelectSearchEntry,
      91             :             if and only if the current entry's mnemonic is unambiguous.
      92             : 
      93             :             For instance, imagine a list which has two entries with the same mnemonic
      94             :             character, say "c". Now if the user presses <code>Alt-C</code>, the MnemonicEngine
      95             :             will call SelectCurrentEntry as soon as it encounters
      96             :             the first entry, but it'll never call ExecuteSearchEntry.
      97             : 
      98             :             If, however, "c" is a unique mnemonic character in your entry list, then the
      99             :             call of SelectSearchEntry will be followed by a
     100             :             call to ExecuteSearchEntry.
     101             : 
     102             :             This way, you can implement cyclic selection of entries: In
     103             :             FirstSearchEntry, return the entry which was previously
     104             :             selected, and in NextSearchEntry, interlly cycle around
     105             :             in your list. Then, multiple user inputs of <code>Alt-C</code> will
     106             :             cycle through all entries with the mnemonic being "c".
     107             : 
     108             :             @param _pEntry
     109             :                 the entry to select. This is the return value of a previous call
     110             :                 to FirstSearchEntry or NextSearchEntry.
     111             :         */
     112             :         virtual void    ExecuteSearchEntry( const void* _pEntry ) const = 0;
     113             : 
     114             :     protected:
     115          26 :         ~IMnemonicEntryList() {}
     116             :     };
     117             : 
     118             : 
     119             :     //= MnemonicEngine
     120             : 
     121             :     struct MnemonicEngine_Data;
     122             :     class VCL_DLLPUBLIC MnemonicEngine
     123             :     {
     124             :         ::std::unique_ptr< MnemonicEngine_Data >  m_pData;
     125             : 
     126             :     public:
     127             :         MnemonicEngine( IMnemonicEntryList& _rEntryList );
     128             :         ~MnemonicEngine();
     129             : 
     130             :         /** handles a key event
     131             : 
     132             :             If the key event denotes pressing an accelerator key, then the
     133             :             entry list is searched for a matching entry. If such an entry is
     134             :             found, IMnemonicEntryList::SelectSearchEntry
     135             :             is called.
     136             : 
     137             :             If the entry is the only one with the given mnemonic character, then
     138             :             also IMnemonicEntryList::ExecuteSearchEntry
     139             :             is called.
     140             : 
     141             :             @return
     142             :                 if the key event has been handled, and should thus not be processed
     143             :                 further.
     144             :         */
     145             :         bool    HandleKeyEvent( const KeyEvent& _rKEvt );
     146             :     };
     147             : 
     148             : 
     149             : } // namespace vcl
     150             : 
     151             : 
     152             : #endif // INCLUDED_VCL_MNEMONICENGINE_HXX
     153             : 
     154             : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */

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