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      1 /*
      2  * Copyright (C) 2013 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 are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #ifndef InputMethodContext_h
     32 #define InputMethodContext_h
     33 
     34 #include "core/editing/CompositionUnderline.h"
     35 #include "core/events/EventTarget.h"
     36 #include "core/html/HTMLElement.h"
     37 #include "wtf/PassOwnPtr.h"
     38 #include "wtf/RefPtr.h"
     39 #include "wtf/text/AtomicString.h"
     40 #include "wtf/text/WTFString.h"
     41 
     42 namespace blink {
     43 
     44 class ExecutionContext;
     45 class InputMethodController;
     46 class Node;
     47 
     48 class InputMethodContext FINAL : public NoBaseWillBeGarbageCollectedFinalized<InputMethodContext>, public EventTargetWithInlineData {
     49     DEFINE_WRAPPERTYPEINFO();
     50     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(InputMethodContext);
     51 public:
     52     static PassOwnPtrWillBeRawPtr<InputMethodContext> create(HTMLElement*);
     53     virtual ~InputMethodContext();
     54 
     55 #if !ENABLE(OILPAN)
     56     void ref() { m_element->ref(); }
     57     void deref() { m_element->deref(); }
     58 #endif
     59 
     60     String locale() const;
     61     HTMLElement* target() const;
     62     unsigned compositionStartOffset();
     63     unsigned compositionEndOffset();
     64     void confirmComposition();
     65 
     66     String compositionText() const;
     67     int selectionStart() const;
     68     int selectionEnd() const;
     69     const Vector<unsigned>& segments();
     70 
     71     virtual const AtomicString& interfaceName() const OVERRIDE;
     72     virtual ExecutionContext* executionContext() const OVERRIDE;
     73 
     74     DEFINE_ATTRIBUTE_EVENT_LISTENER(candidatewindowshow);
     75     DEFINE_ATTRIBUTE_EVENT_LISTENER(candidatewindowupdate);
     76     DEFINE_ATTRIBUTE_EVENT_LISTENER(candidatewindowhide);
     77 
     78     void dispatchCandidateWindowShowEvent();
     79     void dispatchCandidateWindowUpdateEvent();
     80     void dispatchCandidateWindowHideEvent();
     81 
     82     virtual void trace(Visitor*) OVERRIDE;
     83 
     84 private:
     85     InputMethodContext(HTMLElement*);
     86     bool hasFocus() const;
     87     CompositionUnderline selectedSegment() const;
     88     InputMethodController& inputMethodController() const;
     89 
     90 #if !ENABLE(OILPAN)
     91     virtual void refEventTarget() OVERRIDE { ref(); }
     92     virtual void derefEventTarget() OVERRIDE { deref(); }
     93 #endif
     94 
     95     RawPtrWillBeMember<HTMLElement> m_element;
     96     Vector<unsigned> m_segments;
     97 };
     98 
     99 } // namespace blink
    100 
    101 #endif // InputMethodContext_h
    102