TextFieldInputType.cpp   [plain text]

/*
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 * Copyright (C) 2011 Apple Inc. All rights reserved.
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#include "config.h"
#include "TextFieldInputType.h"

#include "BeforeTextInsertedEvent.h"
#include "Frame.h"
#include "HTMLInputElement.h"
#include "KeyboardEvent.h"
#include "RenderTextControlSingleLine.h"
#include "TextEvent.h"
#include "TextIterator.h"
#include "WheelEvent.h"
#include <wtf/text/WTFString.h>

namespace WebCore {

bool TextFieldInputType::isTextField() const
{
    return true;
}

bool TextFieldInputType::valueMissing(const String& value) const
{
    return value.isEmpty();
}

bool TextFieldInputType::canSetSuggestedValue()
{
    return true;
}

void TextFieldInputType::handleKeydownEvent(KeyboardEvent* event)
{
    if (!element()->focused())
        return;
    Frame* frame = element()->document()->frame();
    if (!frame || !frame->editor()->doTextFieldCommandFromEvent(element(), event))
        return;
    event->setDefaultHandled();
}

void TextFieldInputType::handleKeydownEventForSpinButton(KeyboardEvent* event)
{
    if (element()->disabled() || element()->readOnly())
        return;
    const String& key = event->keyIdentifier();
    int step = 0;
    if (key == "Up")
        step = 1;
    else if (key == "Down")
        step = -1;
    else
        return;
    element()->stepUpFromRenderer(step);
    event->setDefaultHandled();
}

void TextFieldInputType::handleWheelEventForSpinButton(WheelEvent* event)
{
    if (element()->disabled() || element()->readOnly() || !element()->focused())
        return;
    int step = 0;
    if (event->wheelDeltaY() > 0)
        step = 1;
    else if (event->wheelDeltaY() < 0)
        step = -1;
    else
        return;
    element()->stepUpFromRenderer(step);
    event->setDefaultHandled();
}

void TextFieldInputType::forwardEvent(Event* event)
{
    if (element()->renderer() && (event->isMouseEvent() || event->isDragEvent() || event->isWheelEvent() || event->type() == eventNames().blurEvent || event->type() == eventNames().focusEvent))
        toRenderTextControlSingleLine(element()->renderer())->forwardEvent(event);
}

bool TextFieldInputType::shouldSubmitImplicitly(Event* event)
{
    return (event->type() == eventNames().textInputEvent && event->isTextEvent() && static_cast<TextEvent*>(event)->data() == "\n") || InputType::shouldSubmitImplicitly(event);
}

RenderObject* TextFieldInputType::createRenderer(RenderArena* arena, RenderStyle*) const
{
    return new (arena) RenderTextControlSingleLine(element(), element()->placeholderShouldBeVisible());
}

bool TextFieldInputType::shouldUseInputMethod() const
{
    return true;
}

static bool isASCIILineBreak(UChar c)
{
    return c == '\r' || c == '\n';
}

static String limitLength(const String& string, int maxLength)
{
    unsigned newLength = numCharactersInGraphemeClusters(string, maxLength);
    for (unsigned i = 0; i < newLength; ++i) {
        const UChar current = string[i];
        if (current < ' ' && current != '\t') {
            newLength = i;
            break;
        }
    }
    return string.left(newLength);
}

String TextFieldInputType::sanitizeValue(const String& proposedValue)
{
#if ENABLE(WCSS)
    if (!element()->isConformToInputMask(proposedValue)) {
        if (isConformToInputMask(element()->value()))
            return element->value();
        return String();
    }
#endif
    return limitLength(proposedValue.removeCharacters(isASCIILineBreak), HTMLInputElement::maximumLength);
}

void TextFieldInputType::handleBeforeTextInsertedEvent(BeforeTextInsertedEvent* event)
{
    // Make sure that the text to be inserted will not violate the maxLength.

    // We use RenderTextControlSingleLine::text() instead of InputElement::value()
    // because they can be mismatched by sanitizeValue() in
    // RenderTextControlSingleLine::subtreeHasChanged() in some cases.
    unsigned oldLength = numGraphemeClusters(toRenderTextControlSingleLine(element()->renderer())->text());

    // selectionLength represents the selection length of this text field to be
    // removed by this insertion.
    // If the text field has no focus, we don't need to take account of the
    // selection length. The selection is the source of text drag-and-drop in
    // that case, and nothing in the text field will be removed.
    unsigned selectionLength = element()->focused() ? numGraphemeClusters(plainText(element()->document()->frame()->selection()->selection().toNormalizedRange().get())) : 0;
    ASSERT(oldLength >= selectionLength);

    // Selected characters will be removed by the next text event.
    unsigned baseLength = oldLength - selectionLength;
    unsigned maxLength = static_cast<unsigned>(isTextType() ? element()->maxLength() : HTMLInputElement::maximumLength); // maxLength can never be negative.
    unsigned appendableLength = maxLength > baseLength ? maxLength - baseLength : 0;

    // Truncate the inserted text to avoid violating the maxLength and other constraints.
#if ENABLE(WCSS)
    RefPtr<Range> range = element()->document()->frame()->selection()->selection().toNormalizedRange();
    String candidateString = toRenderTextControlSingleLine(element()->renderer())->text();
    if (selectionLength)
        candidateString.replace(range->startOffset(), range->endOffset(), event->text());
    else
        candidateString.insert(event->text(), range->startOffset());
    if (!element()->isConformToInputMask(candidateString)) {
        event->setText("");
        return;
    }
#endif

    String eventText = event->text();
    eventText.replace("\r\n", " ");
    eventText.replace('\r', ' ');
    eventText.replace('\n', ' ');

    event->setText(limitLength(eventText, appendableLength));
}

bool TextFieldInputType::shouldRespectListAttribute()
{
    return true;
}

} // namespace WebCore