root/Source/core/html/ime/InputMethodContext.cpp

DEFINITIONS

1. create
2. locale
3. target
4. compositionStartOffset
5. compositionEndOffset
6. confirmComposition
7. hasFocus
8. compositionText
9. selectedSegment
10. selectionStart
11. selectionEnd
12. segments
13. inputMethodController
14. interfaceName
15. executionContext
16. dispatchCandidateWindowShowEvent
17. dispatchCandidateWindowUpdateEvent
18. dispatchCandidateWindowHideEvent

/*
 * Copyright (C) 2013 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "config.h"
#include "core/html/ime/InputMethodContext.h"

#include "core/dom/Text.h"
#include "core/editing/InputMethodController.h"
#include "core/frame/LocalFrame.h"

namespace WebCore {

PassOwnPtr<InputMethodContext> InputMethodContext::create(HTMLElement* element)
{
    return adoptPtr(new InputMethodContext(element));
}

InputMethodContext::InputMethodContext(HTMLElement* element)
    : m_element(element)
{
    ScriptWrappable::init(this);
}

InputMethodContext::~InputMethodContext()
{
}

String InputMethodContext::locale() const
{
    // FIXME: Implement this.
    return emptyString();
}

HTMLElement* InputMethodContext::target() const
{
    return m_element;
}

unsigned InputMethodContext::compositionStartOffset()
{
    if (hasFocus())
        return inputMethodController().compositionStart();
    return 0;
}

unsigned InputMethodContext::compositionEndOffset()
{
    if (hasFocus())
        return inputMethodController().compositionEnd();
    return 0;
}

void InputMethodContext::confirmComposition()
{
    if (hasFocus())
        inputMethodController().confirmCompositionAndResetState();
}

bool InputMethodContext::hasFocus() const
{
    LocalFrame* frame = m_element->document().frame();
    if (!frame)
        return false;

    const Element* element = frame->document()->focusedElement();
    return element && element->isHTMLElement() && m_element == toHTMLElement(element);
}

String InputMethodContext::compositionText() const
{
    if (!hasFocus())
        return emptyString();

    Text* text = inputMethodController().compositionNode();
    return text ? text->wholeText() : emptyString();
}

CompositionUnderline InputMethodContext::selectedSegment() const
{
    CompositionUnderline underline;
    if (!hasFocus())
        return underline;

    const InputMethodController& controller = inputMethodController();
    if (!controller.hasComposition())
        return underline;

    Vector<CompositionUnderline> underlines = controller.customCompositionUnderlines();
    for (size_t i = 0; i < underlines.size(); ++i) {
        if (underlines[i].thick)
            return underlines[i];
    }

    // When no underline information is available while composition exists,
    // build a CompositionUnderline whose element is the whole composition.
    underline.endOffset = controller.compositionEnd() - controller.compositionStart();
    return underline;

}

int InputMethodContext::selectionStart() const
{
    return selectedSegment().startOffset;
}

int InputMethodContext::selectionEnd() const
{
    return selectedSegment().endOffset;
}

const Vector<unsigned>& InputMethodContext::segments()
{
    m_segments.clear();
    if (!hasFocus())
        return m_segments;
    const InputMethodController& controller = inputMethodController();
    if (!controller.hasComposition())
        return m_segments;

    Vector<CompositionUnderline> underlines = controller.customCompositionUnderlines();
    if (!underlines.size()) {
        m_segments.append(0);
    } else {
        for (size_t i = 0; i < underlines.size(); ++i)
            m_segments.append(underlines[i].startOffset);
    }

    return m_segments;
}

InputMethodController& InputMethodContext::inputMethodController() const
{
    return m_element->document().frame()->inputMethodController();
}

const AtomicString& InputMethodContext::interfaceName() const
{
    return EventTargetNames::InputMethodContext;
}

ExecutionContext* InputMethodContext::executionContext() const
{
    return &m_element->document();
}

void InputMethodContext::dispatchCandidateWindowShowEvent()
{
    dispatchEvent(Event::create(EventTypeNames::candidatewindowshow));
}

void InputMethodContext::dispatchCandidateWindowUpdateEvent()
{
    dispatchEvent(Event::create(EventTypeNames::candidatewindowupdate));
}

void InputMethodContext::dispatchCandidateWindowHideEvent()
{
    dispatchEvent(Event::create(EventTypeNames::candidatewindowhide));
}

} // namespace WebCore