Adding upstream version 1:7.0.4.upstream/1%7.0.4upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 153 insertions, 0 deletions

diff --git a/include/vcl/mnemonicengine.hxx b/include/vcl/mnemonicengine.hxx
new file mode 100644
index 000000000..45d05b5d0
--- /dev/null
+++ b/include/vcl/mnemonicengine.hxx
@@ -0,0 +1,153 @@
+/* -*- 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: */