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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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