htmlinputelement.cpp

linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自WebKit

/*
 * Copyright (C) 1999 Lars Knoll ([e-mail])
 *           (C) 1999 Antti Koivisto ([e-mail])
 *           (C) 2001 Dirk Mueller ([e-mail])
 * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
 *           (C) 2006 Alexey Proskuryakov ([e-mail])
 * Copyright (C) 2007 Samuel Weinig ([e-mail])
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 */

#include "config.h"
#include "HTMLInputElement.h"

#include "ChromeClient.h"
#include "CSSPropertyNames.h"
#include "Document.h"
#include "Editor.h"
#include "Event.h"
#include "EventHandler.h"
#include "EventNames.h"
#include "File.h"
#include "FileList.h"
#include "FocusController.h"
#include "FormDataList.h"
#include "Frame.h"
#include "HTMLFormElement.h"
#include "HTMLImageLoader.h"
#include "HTMLNames.h"
#include "KeyboardEvent.h"
#include "LocalizedStrings.h"
#include "MouseEvent.h"
#include "Page.h"
#include "RenderButton.h"
#include "RenderFileUploadControl.h"
#include "RenderImage.h"
#include "RenderSlider.h"
#include "RenderText.h"
#include "RenderTextControlSingleLine.h"
#include "RenderTheme.h"
#include "TextEvent.h"
#include <wtf/StdLibExtras.h>

using namespace std;

namespace WebCore {

using namespace HTMLNames;

const int maxSavedResults = 256;

HTMLInputElement::HTMLInputElement(const QualifiedName& tagName, Document* doc, HTMLFormElement* f)
    : HTMLFormControlElementWithState(tagName, doc, f)
    , m_data(this, this)
    , m_xPos(0)
    , m_yPos(0)
    , m_maxResults(-1)
    , m_type(TEXT)
    , m_checked(false)
    , m_defaultChecked(false)
    , m_useDefaultChecked(true)
    , m_indeterminate(false)
    , m_haveType(false)
    , m_activeSubmit(false)
    , m_autocomplete(Uninitialized)
    , m_autofilled(false)
    , m_inited(false)
{
    ASSERT(hasTagName(inputTag) || hasTagName(isindexTag));
}

HTMLInputElement::~HTMLInputElement()
{
    if (needsActivationCallback())
        document()->unregisterForDocumentActivationCallbacks(this);

    document()->checkedRadioButtons().removeButton(this);

    // Need to remove this from the form while it is still an HTMLInputElement,
    // so can't wait for the base class's destructor to do it.
    removeFromForm();
}

const AtomicString& HTMLInputElement::name() const
{
    return m_data.name();
}

bool HTMLInputElement::autoComplete() const
{
    if (m_autocomplete != Uninitialized)
        return m_autocomplete == On;
    
    // Assuming we're still in a Form, respect the Form's setting
    if (HTMLFormElement* form = this->form())
        return form->autoComplete();
    
    // The default is true
    return true;
}


static inline HTMLFormElement::CheckedRadioButtons& checkedRadioButtons(const HTMLInputElement *element)
{
    if (HTMLFormElement* form = element->form())
        return form->checkedRadioButtons();
    
    return element->document()->checkedRadioButtons();
}

bool HTMLInputElement::isKeyboardFocusable(KeyboardEvent* event) const
{
    // If text fields can be focused, then they should always be keyboard focusable
    if (isTextField())
        return HTMLFormControlElementWithState::isFocusable();
        
    // If the base class says we can't be focused, then we can stop now.
    if (!HTMLFormControlElementWithState::isKeyboardFocusable(event))
        return false;

    if (inputType() == RADIO) {

        // Never allow keyboard tabbing to leave you in the same radio group.  Always
        // skip any other elements in the group.
        Node* currentFocusedNode = document()->focusedNode();
        if (currentFocusedNode && currentFocusedNode->hasTagName(inputTag)) {
            HTMLInputElement* focusedInput = static_cast<HTMLInputElement*>(currentFocusedNode);
            if (focusedInput->inputType() == RADIO && focusedInput->form() == form() &&
                focusedInput->name() == name())
                return false;
        }
        
        // Allow keyboard focus if we're checked or if nothing in the group is checked.
        return checked() || !checkedRadioButtons(this).checkedButtonForGroup(name());
    }
    
    return true;
}

bool HTMLInputElement::isMouseFocusable() const
{
    if (isTextField())
        return HTMLFormControlElementWithState::isFocusable();
    return HTMLFormControlElementWithState::isMouseFocusable();
}

void HTMLInputElement::updateFocusAppearance(bool restorePreviousSelection)
{        
    if (isTextField())
        InputElement::updateFocusAppearance(m_data, document(), restorePreviousSelection);
    else
        HTMLFormControlElementWithState::updateFocusAppearance(restorePreviousSelection);
}

void HTMLInputElement::aboutToUnload()
{
    InputElement::aboutToUnload(m_data, document());
}

bool HTMLInputElement::shouldUseInputMethod() const
{
    return m_type == TEXT || m_type == SEARCH || m_type == ISINDEX;
}

void HTMLInputElement::dispatchFocusEvent()
{
    InputElement::dispatchFocusEvent(m_data, document());

    if (isTextField())
        m_autofilled = false;

    HTMLFormControlElementWithState::dispatchFocusEvent();
}

void HTMLInputElement::dispatchBlurEvent()
{
    InputElement::dispatchBlurEvent(m_data, document());
    HTMLFormControlElementWithState::dispatchBlurEvent();
}

void HTMLInputElement::setType(const String& t)
{
    if (t.isEmpty()) {
        int exccode;
        removeAttribute(typeAttr, exccode);
    } else
        setAttribute(typeAttr, t);
}

void HTMLInputElement::setInputType(const String& t)
{
    InputType newType;
    
    if (equalIgnoringCase(t, "password"))
        newType = PASSWORD;
    else if (equalIgnoringCase(t, "checkbox"))
        newType = CHECKBOX;
    else if (equalIgnoringCase(t, "radio"))
        newType = RADIO;
    else if (equalIgnoringCase(t, "submit"))
        newType = SUBMIT;
    else if (equalIgnoringCase(t, "reset"))
        newType = RESET;
    else if (equalIgnoringCase(t, "file"))
        newType = FILE;
    else if (equalIgnoringCase(t, "hidden"))
        newType = HIDDEN;
    else if (equalIgnoringCase(t, "image"))
        newType = IMAGE;
    else if (equalIgnoringCase(t, "button"))
        newType = BUTTON;
    else if (equalIgnoringCase(t, "khtml_isindex"))
        newType = ISINDEX;
    else if (equalIgnoringCase(t, "search"))
        newType = SEARCH;
    else if (equalIgnoringCase(t, "range"))
        newType = RANGE;
    else
        newType = TEXT;

    // IMPORTANT: Don't allow the type to be changed to FILE after the first
    // type change, otherwise a JavaScript programmer would be able to set a text
    // field's value to something like /etc/passwd and then change it to a file field.
    if (inputType() != newType) {
        if (newType == FILE && m_haveType)
            // Set the attribute back to the old value.
            // Useful in case we were called from inside parseMappedAttribute.
            setAttribute(typeAttr, type());
        else {
            checkedRadioButtons(this).removeButton(this);

            if (newType == FILE && !m_fileList)
                m_fileList = FileList::create();

            bool wasAttached = attached();
            if (wasAttached)
                detach();

            bool didStoreValue = storesValueSeparateFromAttribute();
            bool wasPasswordField = inputType() == PASSWORD;
            bool didRespectHeightAndWidth = respectHeightAndWidthAttrs();
            m_type = newType;
            bool willStoreValue = storesValueSeparateFromAttribute();
            bool isPasswordField = inputType() == PASSWORD;
            bool willRespectHeightAndWidth = respectHeightAndWidthAttrs();

            if (didStoreValue && !willStoreValue && !m_data.value().isNull()) {
                setAttribute(valueAttr, m_data.value());
                m_data.setValue(String());
            }
            if (!didStoreValue && willStoreValue)
                m_data.setValue(constrainValue(getAttribute(valueAttr)));
            else
                InputElement::updateValueIfNeeded(m_data);

            if (wasPasswordField && !isPasswordField)
                unregisterForActivationCallbackIfNeeded();
            else if (!wasPasswordField && isPasswordField)
                registerForActivationCallbackIfNeeded();

            if (didRespectHeightAndWidth != willRespectHeightAndWidth) {
                NamedMappedAttrMap* map = mappedAttributes();
                if (Attribute* height = map->getAttributeItem(heightAttr))
                    attributeChanged(height, false);
                if (Attribute* width = map->getAttributeItem(widthAttr))
                    attributeChanged(width, false);
                if (Attribute* align = map->getAttributeItem(alignAttr))
                    attributeChanged(align, false);
            }

            if (wasAttached) {
                attach();
                if (document()->focusedNode() == this)
                    updateFocusAppearance(true);
            }

            checkedRadioButtons(this).addButton(this);
        }

        InputElement::notifyFormStateChanged(m_data, document());
    }
    m_haveType = true;

    if (inputType() != IMAGE && m_imageLoader)
        m_imageLoader.clear();
}

const AtomicString& HTMLInputElement::type() const
{
    // needs to be lowercase according to DOM spec
    switch (inputType()) {
        case BUTTON: {
            DEFINE_STATIC_LOCAL(const AtomicString, button, ("button"));
            return button;
        }
        case CHECKBOX: {
            DEFINE_STATIC_LOCAL(const AtomicString, checkbox, ("checkbox"));
            return checkbox;
        }
        case FILE: {
            DEFINE_STATIC_LOCAL(const AtomicString, file, ("file"));
            return file;
        }
        case HIDDEN: {
            DEFINE_STATIC_LOCAL(const AtomicString, hidden, ("hidden"));
            return hidden;
        }
        case IMAGE: {
            DEFINE_STATIC_LOCAL(const AtomicString, image, ("image"));
            return image;
        }
        case ISINDEX:
            return emptyAtom;
        case PASSWORD: {
            DEFINE_STATIC_LOCAL(const AtomicString, password, ("password"));
            return password;
        }
        case RADIO: {
            DEFINE_STATIC_LOCAL(const AtomicString, radio, ("radio"));
            return radio;
        }
        case RANGE: {
            DEFINE_STATIC_LOCAL(const AtomicString, range, ("range"));
            return range;
        }
        case RESET: {
            DEFINE_STATIC_LOCAL(const AtomicString, reset, ("reset"));
            return reset;
        }
        case SEARCH: {
            DEFINE_STATIC_LOCAL(const AtomicString, search, ("search"));
            return search;
        }
        case SUBMIT: {
            DEFINE_STATIC_LOCAL(const AtomicString, submit, ("submit"));
            return submit;
        }
        case TEXT: {
            DEFINE_STATIC_LOCAL(const AtomicString, text, ("text"));
            return text;
        }
    }
    return emptyAtom;
}

bool HTMLInputElement::saveState(String& result) const
{
    if (!autoComplete())
        return false;

    switch (inputType()) {
        case BUTTON:
        case FILE:
        case HIDDEN:
        case IMAGE:
        case ISINDEX:
        case RANGE:
        case RESET:
        case SEARCH:
        case SUBMIT:
        case TEXT:
            result = value();
            return true;
        case CHECKBOX:
        case RADIO:
            result = checked() ? "on" : "off";
            return true;
        case PASSWORD:
            return false;
    }
    ASSERT_NOT_REACHED();
    return false;
}

void HTMLInputElement::restoreState(const String& state)
{
    ASSERT(inputType() != PASSWORD); // should never save/restore password fields
    switch (inputType()) {
        case BUTTON: