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      1 /*
      2  * Copyright (C) 2012 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1.  Redistributions of source code must retain the above copyright
      8  *     notice, this list of conditions and the following disclaimer.
      9  * 2.  Redistributions in binary form must reproduce the above copyright
     10  *     notice, this list of conditions and the following disclaimer in the
     11  *     documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND
     14  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     16  * ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE
     17  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     18  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     19  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
     20  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     21  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     22  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     23  * SUCH DAMAGE.
     24  */
     25 
     26 #ifndef TypeAhead_h
     27 #define TypeAhead_h
     28 
     29 #include "core/dom/DOMTimeStamp.h"
     30 #include "wtf/text/StringBuilder.h"
     31 #include "wtf/text/WTFString.h"
     32 
     33 namespace WebCore {
     34 
     35 class KeyboardEvent;
     36 
     37 class TypeAheadDataSource {
     38 public:
     39     virtual ~TypeAheadDataSource() { }
     40 
     41     virtual int indexOfSelectedOption() const = 0;
     42     virtual int optionCount() const = 0;
     43     virtual String optionAtIndex(int index) const = 0;
     44 };
     45 
     46 class TypeAhead {
     47 public:
     48     TypeAhead(TypeAheadDataSource*);
     49 
     50     enum ModeFlag {
     51         MatchPrefix = 1 << 0,
     52         CycleFirstChar = 1 << 1,
     53         MatchIndex = 1 << 2,
     54     };
     55     typedef unsigned MatchModeFlags;
     56 
     57     // Returns the index for the matching option.
     58     int handleEvent(KeyboardEvent*, MatchModeFlags);
     59 
     60 private:
     61     TypeAheadDataSource* m_dataSource;
     62     DOMTimeStamp m_lastTypeTime;
     63     UChar m_repeatingChar;
     64     StringBuilder m_buffer;
     65 };
     66 
     67 } // namespace WebCore
     68 
     69 #endif // TypeAhead_h
     70