Source/WebCore/html/SearchInputType.cpp

/*
 * Copyright (C) 2010 Google Inc. All rights reserved.
 * Copyright (C) 2014 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
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 * notice, this list of conditions and the following disclaimer.
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 * in the documentation and/or other materials provided with the
 * distribution.
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 * 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
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 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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#include "config.h"
#include "SearchInputType.h"

#include "HTMLInputElement.h"
#include "HTMLNames.h"
#include "InputTypeNames.h"
#include "KeyboardEvent.h"
#include "RenderSearchField.h"
#include "ShadowRoot.h"
#include "TextControlInnerElements.h"

namespace WebCore {

using namespace HTMLNames;

SearchInputType::SearchInputType(HTMLInputElement& element)
    : BaseTextInputType(element)
    , m_resultsButton(nullptr)
    , m_cancelButton(nullptr)
    , m_searchEventTimer(*this, &SearchInputType::searchEventTimerFired)
{
}

void SearchInputType::addSearchResult()
{
#if !PLATFORM(IOS)
    if (auto* renderer = element().renderer())
        downcast<RenderSearchField>(*renderer).addSearchResult();
#endif
}

static void updateResultButtonPseudoType(SearchFieldResultsButtonElement& resultButton, int maxResults)
{
    if (!maxResults)
        resultButton.setPseudo(AtomicString("-webkit-search-results-decoration", AtomicString::ConstructFromLiteral));
    else if (maxResults < 0)
        resultButton.setPseudo(AtomicString("-webkit-search-decoration", AtomicString::ConstructFromLiteral));
    else if (maxResults > 0)
        resultButton.setPseudo(AtomicString("-webkit-search-results-button", AtomicString::ConstructFromLiteral));
}

void SearchInputType::maxResultsAttributeChanged()
{
    if (m_resultsButton)
        updateResultButtonPseudoType(*m_resultsButton, element().maxResults());
}

RenderPtr<RenderElement> SearchInputType::createInputRenderer(RenderStyle&& style)
{
    return createRenderer<RenderSearchField>(element(), WTFMove(style));
}

const AtomicString& SearchInputType::formControlType() const
{
    return InputTypeNames::search();
}

bool SearchInputType::isSearchField() const
{
    return true;
}

bool SearchInputType::needsContainer() const
{
    return true;
}

void SearchInputType::createShadowSubtree()
{
    ASSERT(!m_resultsButton);
    ASSERT(!m_cancelButton);

    TextFieldInputType::createShadowSubtree();
    HTMLElement* container = containerElement();
    HTMLElement* textWrapper = innerBlockElement();
    ASSERT(container);
    ASSERT(textWrapper);

    auto resultsButton = SearchFieldResultsButtonElement::create(element().document());
    m_resultsButton = resultsButton.ptr();
    updateResultButtonPseudoType(resultsButton.get(), element().maxResults());
    container->insertBefore(resultsButton, textWrapper, IGNORE_EXCEPTION);

    auto cancelButton = SearchFieldCancelButtonElement::create(element().document());
    m_cancelButton = cancelButton.ptr();
    container->insertBefore(cancelButton, textWrapper->nextSibling(), IGNORE_EXCEPTION);
}

HTMLElement* SearchInputType::resultsButtonElement() const
{
    return m_resultsButton;
}

HTMLElement* SearchInputType::cancelButtonElement() const
{
    return m_cancelButton;
}

void SearchInputType::handleKeydownEvent(KeyboardEvent& event)
{
    if (element().isDisabledOrReadOnly()) {
        TextFieldInputType::handleKeydownEvent(event);
        return;
    }

    const String& key = event.keyIdentifier();
    if (key == "U+001B") {
        Ref<HTMLInputElement> input(this->element());
        input->setValueForUser(emptyString());
        input->onSearch();
        event.setDefaultHandled();
        return;
    }
    TextFieldInputType::handleKeydownEvent(event);
}

void SearchInputType::destroyShadowSubtree()
{
    TextFieldInputType::destroyShadowSubtree();
    m_resultsButton = nullptr;
    m_cancelButton = nullptr;
}

void SearchInputType::startSearchEventTimer()
{
    ASSERT(element().renderer());
    unsigned length = element().innerTextValue().length();

    if (!length) {
        stopSearchEventTimer();
        element().onSearch();
        return;
    }

    // After typing the first key, we wait 0.5 seconds.
    // After the second key, 0.4 seconds, then 0.3, then 0.2 from then on.
    m_searchEventTimer.startOneShot(std::max(0.2, 0.6 - 0.1 * length));
}

void SearchInputType::stopSearchEventTimer()
{
    m_searchEventTimer.stop();
}

void SearchInputType::searchEventTimerFired()
{
    element().onSearch();
}

bool SearchInputType::searchEventsShouldBeDispatched() const
{
    return element().hasAttributeWithoutSynchronization(incrementalAttr);
}

void SearchInputType::didSetValueByUserEdit()
{
    if (m_cancelButton && element().renderer())
        downcast<RenderSearchField>(*element().renderer()).updateCancelButtonVisibility();

    // If the incremental attribute is set, then dispatch the search event
    if (searchEventsShouldBeDispatched())
        startSearchEventTimer();

    TextFieldInputType::didSetValueByUserEdit();
}

bool SearchInputType::sizeShouldIncludeDecoration(int, int& preferredSize) const
{
    preferredSize = element().size();
    return true;
}

float SearchInputType::decorationWidth() const
{
    float width = 0;
    if (m_resultsButton)
        width += m_resultsButton->computedStyle()->logicalWidth().value();
    if (m_cancelButton)
        width += m_cancelButton->computedStyle()->logicalWidth().value();
    return width;
}

} // namespace WebCore