third_party/WebKit/Source/core/html/shadow/DateTimeFieldElement.cpp

/*
 * Copyright (C) 2012 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:
 * 1.  Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 * 2.  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.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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#include "core/html/shadow/DateTimeFieldElement.h"

#include "core/HTMLNames.h"
#include "core/dom/Document.h"
#include "core/dom/StyleChangeReason.h"
#include "core/dom/Text.h"
#include "core/events/KeyboardEvent.h"
#include "core/layout/TextRunConstructor.h"
#include "core/style/ComputedStyle.h"
#include "platform/text/PlatformLocale.h"
#include "wtf/text/WTFString.h"

namespace blink {

using namespace HTMLNames;

DateTimeFieldElement::FieldOwner::~FieldOwner() {}

DateTimeFieldElement::DateTimeFieldElement(Document& document,
                                           FieldOwner& fieldOwner)
    : HTMLSpanElement(document), m_fieldOwner(&fieldOwner) {}

DEFINE_TRACE(DateTimeFieldElement) {
  visitor->trace(m_fieldOwner);
  HTMLSpanElement::trace(visitor);
}

float DateTimeFieldElement::computeTextWidth(const ComputedStyle& style,
                                             const String& text) {
  return style.font().width(constructTextRun(style.font(), text, style));
}

void DateTimeFieldElement::defaultEventHandler(Event* event) {
  if (event->isKeyboardEvent()) {
    KeyboardEvent* keyboardEvent = toKeyboardEvent(event);
    if (!isDisabled() && !isFieldOwnerDisabled() && !isFieldOwnerReadOnly()) {
      handleKeyboardEvent(keyboardEvent);
      if (keyboardEvent->defaultHandled()) {
        if (m_fieldOwner)
          m_fieldOwner->fieldDidChangeValueByKeyboard();
        return;
      }
    }
    defaultKeyboardEventHandler(keyboardEvent);
    if (m_fieldOwner)
      m_fieldOwner->fieldDidChangeValueByKeyboard();
    if (keyboardEvent->defaultHandled())
      return;
  }

  HTMLElement::defaultEventHandler(event);
}

void DateTimeFieldElement::defaultKeyboardEventHandler(
    KeyboardEvent* keyboardEvent) {
  if (keyboardEvent->type() != EventTypeNames::keydown)
    return;

  if (isDisabled() || isFieldOwnerDisabled())
    return;

  const String& key = keyboardEvent->key();

  if (key == "ArrowLeft") {
    if (!m_fieldOwner)
      return;
    // FIXME: We'd like to use FocusController::advanceFocus(FocusDirectionLeft,
    // ...) but it doesn't work for shadow nodes. webkit.org/b/104650
    if (!localeForOwner().isRTL() && m_fieldOwner->focusOnPreviousField(*this))
      keyboardEvent->setDefaultHandled();
    return;
  }

  if (key == "ArrowRight") {
    if (!m_fieldOwner)
      return;
    // FIXME: We'd like to use
    // FocusController::advanceFocus(FocusDirectionRight, ...)
    // but it doesn't work for shadow nodes. webkit.org/b/104650
    if (!localeForOwner().isRTL() && m_fieldOwner->focusOnNextField(*this))
      keyboardEvent->setDefaultHandled();
    return;
  }

  if (isFieldOwnerReadOnly())
    return;

  if (key == "ArrowDown") {
    if (keyboardEvent->getModifierState("Alt"))
      return;
    keyboardEvent->setDefaultHandled();
    stepDown();
    return;
  }

  if (key == "ArrowUp") {
    keyboardEvent->setDefaultHandled();
    stepUp();
    return;
  }

  if (key == "Backspace" || key == "Delete") {
    keyboardEvent->setDefaultHandled();
    setEmptyValue(DispatchEvent);
    return;
  }
}

void DateTimeFieldElement::setFocus(bool value) {
  if (m_fieldOwner)
    value ? m_fieldOwner->didFocusOnField() : m_fieldOwner->didBlurFromField();
  ContainerNode::setFocus(value);
}

void DateTimeFieldElement::focusOnNextField() {
  if (!m_fieldOwner)
    return;
  m_fieldOwner->focusOnNextField(*this);
}

void DateTimeFieldElement::initialize(const AtomicString& pseudo,
                                      const String& axHelpText,
                                      int axMinimum,
                                      int axMaximum) {
  // On accessibility, DateTimeFieldElement acts like spin button.
  setAttribute(roleAttr, AtomicString("spinbutton"));
  setAttribute(aria_valuetextAttr, AtomicString(visibleValue()));
  setAttribute(aria_valueminAttr, AtomicString::number(axMinimum));
  setAttribute(aria_valuemaxAttr, AtomicString::number(axMaximum));

  setAttribute(aria_helpAttr, AtomicString(axHelpText));
  setShadowPseudoId(pseudo);
  appendChild(Text::create(document(), visibleValue()));
}

bool DateTimeFieldElement::isDateTimeFieldElement() const {
  return true;
}

bool DateTimeFieldElement::isFieldOwnerDisabled() const {
  return m_fieldOwner && m_fieldOwner->isFieldOwnerDisabled();
}

bool DateTimeFieldElement::isFieldOwnerReadOnly() const {
  return m_fieldOwner && m_fieldOwner->isFieldOwnerReadOnly();
}

bool DateTimeFieldElement::isDisabled() const {
  return fastHasAttribute(disabledAttr);
}

Locale& DateTimeFieldElement::localeForOwner() const {
  return document().getCachedLocale(localeIdentifier());
}

AtomicString DateTimeFieldElement::localeIdentifier() const {
  return m_fieldOwner ? m_fieldOwner->localeIdentifier() : nullAtom;
}

float DateTimeFieldElement::maximumWidth(const ComputedStyle&) {
  const float paddingLeftAndRight = 2;  // This should match to html.css.
  return paddingLeftAndRight;
}

void DateTimeFieldElement::setDisabled() {
  // Set HTML attribute disabled to change apperance.
  setBooleanAttribute(disabledAttr, true);
  setNeedsStyleRecalc(
      SubtreeStyleChange,
      StyleChangeReasonForTracing::createWithExtraData(
          StyleChangeReason::PseudoClass, StyleChangeExtraData::Disabled));
}

bool DateTimeFieldElement::supportsFocus() const {
  return !isDisabled() && !isFieldOwnerDisabled();
}

void DateTimeFieldElement::updateVisibleValue(EventBehavior eventBehavior) {
  Text* const textNode = toText(firstChild());
  const String newVisibleValue = visibleValue();
  DCHECK_GT(newVisibleValue.length(), 0u);

  if (textNode->wholeText() == newVisibleValue)
    return;

  textNode->replaceWholeText(newVisibleValue);
  if (hasValue()) {
    setAttribute(aria_valuenowAttr,
                 AtomicString::number(valueForARIAValueNow()));
  } else {
    removeAttribute(aria_valuenowAttr);
  }
  setAttribute(aria_valuetextAttr, AtomicString(newVisibleValue));

  if (eventBehavior == DispatchEvent && m_fieldOwner)
    m_fieldOwner->fieldValueChanged();
}

int DateTimeFieldElement::valueForARIAValueNow() const {
  return valueAsInteger();
}

}  // namespace blink