htmlinputelement.cpp

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                String enc_str = valueWithDefault();
                encoding.appendData(name(), enc_str);
                return true;
            }
            break;

        case FILE: {
            // Can't submit file on GET.
            if (!multipart)
                return false;

            // If no filename at all is entered, return successful but empty.
            // Null would be more logical, but Netscape posts an empty file. Argh.
            unsigned numFiles = m_fileList->length();
            if (!numFiles) {
                encoding.appendFile(name(), File::create(""));
                return true;
            }

            for (unsigned i = 0; i < numFiles; ++i)
                encoding.appendFile(name(), m_fileList->item(i));
            return true;
        }
    }
    return false;
}

void HTMLInputElement::reset()
{
    if (storesValueSeparateFromAttribute())
        setValue(String());

    setChecked(m_defaultChecked);
    m_useDefaultChecked = true;
}

void HTMLInputElement::setChecked(bool nowChecked, bool sendChangeEvent)
{
    if (checked() == nowChecked)
        return;

    checkedRadioButtons(this).removeButton(this);

    m_useDefaultChecked = false;
    m_checked = nowChecked;
    setChanged();

    checkedRadioButtons(this).addButton(this);
    
    if (renderer() && renderer()->style()->hasAppearance())
        theme()->stateChanged(renderer(), CheckedState);

    // Only send a change event for items in the document (avoid firing during
    // parsing) and don't send a change event for a radio button that's getting
    // unchecked to match other browsers. DOM is not a useful standard for this
    // because it says only to fire change events at "lose focus" time, which is
    // definitely wrong in practice for these types of elements.
    if (sendChangeEvent && inDocument() && (inputType() != RADIO || nowChecked))
        onChange();
}

void HTMLInputElement::setIndeterminate(bool _indeterminate)
{
    // Only checkboxes honor indeterminate.
    if (inputType() != CHECKBOX || indeterminate() == _indeterminate)
        return;

    m_indeterminate = _indeterminate;

    setChanged();

    if (renderer() && renderer()->style()->hasAppearance())
        theme()->stateChanged(renderer(), CheckedState);
}

int HTMLInputElement::size() const
{
    return m_data.size();
}

void HTMLInputElement::copyNonAttributeProperties(const Element* source)
{
    const HTMLInputElement* sourceElement = static_cast<const HTMLInputElement*>(source);

    m_data.setValue(sourceElement->m_data.value());
    m_checked = sourceElement->m_checked;
    m_indeterminate = sourceElement->m_indeterminate;

    HTMLFormControlElementWithState::copyNonAttributeProperties(source);
}

String HTMLInputElement::value() const
{
    // The HTML5 spec (as of the 10/24/08 working draft) says that the value attribute isn't applicable to the file upload control
    // but we don't want to break existing websites, who may be relying on being able to get the file name as a value.
    if (inputType() == FILE) {
        if (!m_fileList->isEmpty())
            return m_fileList->item(0)->fileName();
        return String();
    }

    String value = m_data.value();
    if (value.isNull()) {
        value = constrainValue(getAttribute(valueAttr));

        // If no attribute exists, then just use "on" or "" based off the checked() state of the control.
        if (value.isNull() && (inputType() == CHECKBOX || inputType() == RADIO))
            return checked() ? "on" : "";
    }

    return value;
}

String HTMLInputElement::valueWithDefault() const
{
    String v = value();
    if (v.isNull()) {
        switch (inputType()) {
            case BUTTON:
            case CHECKBOX:
            case FILE:
            case HIDDEN:
            case IMAGE:
            case ISINDEX:
            case PASSWORD:
            case RADIO:
            case RANGE:
            case SEARCH:
            case TEXT:
                break;
            case RESET:
                v = resetButtonDefaultLabel();
                break;
            case SUBMIT:
                v = submitButtonDefaultLabel();
                break;
        }
    }
    return v;
}

void HTMLInputElement::setValue(const String& value)
{
    // For security reasons, we don't allow setting the filename, but we do allow clearing it.
    // The HTML5 spec (as of the 10/24/08 working draft) says that the value attribute isn't applicable to the file upload control
    // but we don't want to break existing websites, who may be relying on this method to clear things.
    if (inputType() == FILE && !value.isEmpty())
        return;

    if (isTextField())
        InputElement::updatePlaceholderVisibility(m_data, document());

    setValueMatchesRenderer(false);
    if (storesValueSeparateFromAttribute()) {
        if (inputType() == FILE)
            m_fileList->clear();
        else {
            m_data.setValue(constrainValue(value));
            if (isTextField() && inDocument())
                document()->updateRendering();
        }
        if (renderer())
            renderer()->updateFromElement();
        setChanged();
    } else
        setAttribute(valueAttr, constrainValue(value));
    
    if (isTextField()) {
        unsigned max = m_data.value().length();
        if (document()->focusedNode() == this)
            InputElement::updateSelectionRange(m_data, max, max);
        else
            cacheSelection(max, max);
    }
    InputElement::notifyFormStateChanged(m_data, document());
}

String HTMLInputElement::placeholderValue() const
{
    return getAttribute(placeholderAttr).string();
}

bool HTMLInputElement::searchEventsShouldBeDispatched() const
{
    return hasAttribute(incrementalAttr);
}

void HTMLInputElement::setValueFromRenderer(const String& value)
{
    // File upload controls will always use setFileListFromRenderer.
    ASSERT(inputType() != FILE);
    InputElement::setValueFromRenderer(m_data, document(), value);
}

void HTMLInputElement::setFileListFromRenderer(const Vector<String>& paths)
{
    m_fileList->clear();
    int size = paths.size();
    for (int i = 0; i < size; i++)
        m_fileList->append(File::create(paths[i]));

    setValueMatchesRenderer();
    InputElement::notifyFormStateChanged(m_data, document());
}

bool HTMLInputElement::storesValueSeparateFromAttribute() const
{
    switch (inputType()) {
        case BUTTON:
        case CHECKBOX:
        case HIDDEN:
        case IMAGE:
        case RADIO:
        case RESET:
        case SUBMIT:
            return false;
        case FILE:
        case ISINDEX:
        case PASSWORD:
        case RANGE:
        case SEARCH:
        case TEXT:
            return true;
    }
    return false;
}

void* HTMLInputElement::preDispatchEventHandler(Event *evt)
{
    // preventDefault or "return false" are used to reverse the automatic checking/selection we do here.
    // This result gives us enough info to perform the "undo" in postDispatch of the action we take here.
    void* result = 0; 
    if ((inputType() == CHECKBOX || inputType() == RADIO) && evt->isMouseEvent()
            && evt->type() == eventNames().clickEvent && static_cast<MouseEvent*>(evt)->button() == LeftButton) {
        if (inputType() == CHECKBOX) {
            // As a way to store the state, we return 0 if we were unchecked, 1 if we were checked, and 2 for
            // indeterminate.
            if (indeterminate()) {
                result = (void*)0x2;
                setIndeterminate(false);
            } else {
                if (checked())
                    result = (void*)0x1;
                setChecked(!checked(), true);
            }
        } else {
            // For radio buttons, store the current selected radio object.
            // We really want radio groups to end up in sane states, i.e., to have something checked.
            // Therefore if nothing is currently selected, we won't allow this action to be "undone", since
            // we want some object in the radio group to actually get selected.
            HTMLInputElement* currRadio = checkedRadioButtons(this).checkedButtonForGroup(name());
            if (currRadio) {
                // We have a radio button selected that is not us.  Cache it in our result field and ref it so
                // that it can't be destroyed.
                currRadio->ref();
                result = currRadio;
            }
            setChecked(true, true);
        }
    }
    return result;
}

void HTMLInputElement::postDispatchEventHandler(Event *evt, void* data)
{
    if ((inputType() == CHECKBOX || inputType() == RADIO) && evt->isMouseEvent()
            && evt->type() == eventNames().clickEvent && static_cast<MouseEvent*>(evt)->button() == LeftButton) {
        if (inputType() == CHECKBOX) {
            // Reverse the checking we did in preDispatch.
            if (evt->defaultPrevented() || evt->defaultHandled()) {
                if (data == (void*)0x2)
                    setIndeterminate(true);
                else
                    setChecked(data);
            }
        } else if (data) {
            HTMLInputElement* input = static_cast<HTMLInputElement*>(data);
            if (evt->defaultPrevented() || evt->defaultHandled()) {
                // Restore the original selected radio button if possible.
                // Make sure it is still a radio button and only do the restoration if it still
                // belongs to our group.

                if (input->form() == form() && input->inputType() == RADIO && input->name() == name()) {
                    // Ok, the old radio button is still in our form and in our group and is still a 
                    // radio button, so it's safe to restore selection to it.
                    input->setChecked(true);
                }
            }
            input->deref();
        }

        // Left clicks on radio buttons and check boxes already performed default actions in preDispatchEventHandler(). 
        evt->setDefaultHandled();
    }
}

void HTMLInputElement::defaultEventHandler(Event* evt)
{
    bool clickDefaultFormButton = false;

    if (isTextField() && evt->type() == eventNames().textInputEvent && evt->isTextEvent() && static_cast<TextEvent*>(evt)->data() == "\n")
        clickDefaultFormButton = true;

    if (inputType() == IMAGE && evt->isMouseEvent() && evt->type() == eventNames().clickEvent) {
        // record the mouse position for when we get the DOMActivate event
        MouseEvent* me = static_cast<MouseEvent*>(evt);
        // FIXME: We could just call offsetX() and offsetY() on the event,
        // but that's currently broken, so for now do the computation here.
        if (me->isSimulated() || !renderer()) {
            m_xPos = 0;
            m_yPos = 0;
        } else {
            // FIXME: This doesn't work correctly with transforms.
            IntPoint absOffset = roundedIntPoint(renderer()->localToAbsolute());
            m_xPos = me->pageX() - absOffset.x();
            m_yPos = me->pageY() - absOffset.y();
        }
    }

    if (isTextField() && evt->type() == eventNames().keydownEvent && evt->isKeyboardEvent() && focused() && document()->frame()
        && document()->frame()->doTextFieldCommandFromEvent(this, static_cast<KeyboardEvent*>(evt))) {
        evt->setDefaultHandled();
        return;
    }

    if (inputType() == RADIO && evt->isMouseEvent()
        && evt->type() == eventNames().clickEvent && static_cast<MouseEvent*>(evt)->button() == LeftButton) {
        evt->setDefaultHandled();
        return;
    }
    
    // Let the key handling done in Node take precedence over the event handling here for editable text fields
    if (!clickDefaultFormButton) {
        HTMLFormControlElementWithState::defaultEventHandler(evt);
        if (evt->defaultHandled())
            return;
    }

    // DOMActivate events cause the input to be "activated" - in the case of image and submit inputs, this means
    // actually submitting the form. For reset inputs, the form is reset. These events are sent when the user clicks
    // on the element, or presses enter while it is the active element. JavaScript code wishing to activate the element
    // must dispatch a DOMActivate event - a click event will not do the job.
    if (evt->type() == eventNames().DOMActivateEvent && !disabled()) {
        if (inputType() == IMAGE || inputType() == SUBMIT || inputType() == RESET) {
            if (!form())
                return;
            if (inputType() == RESET)
                form()->reset();
            else {
                m_activeSubmit = true;
                // FIXME: Would be cleaner to get m_xPos and m_yPos out of the underlying mouse
                // event (if any) here instead of relying on the variables set above when
                // processing the click event. Even better, appendFormData could pass the
                // event in, and then we could get rid of m_xPos and m_yPos altogether!
                if (!form()->prepareSubmit(evt)) {
                    m_xPos = 0;
                    m_yPos = 0;
                }
                m_activeSubmit = false;
            }
        } else if (inputType() == FILE && renderer())
            static_cast<RenderFileUploadControl*>(renderer())->click();
    }

    // Use key press event here since sending simulated mouse events
    // on key down blocks the proper sending of the key press event.
    if (evt->type() == eventNames().keypressEvent && evt->isKeyboardEvent()) {
        bool clickElement = false;

        int charCode = static_cast<KeyboardEvent*>(evt)->charCode();

        if (charCode == '\r') {
            switch (inputType()) {
                case CHECKBOX:
                case HIDDEN:
                case ISINDEX:
                case PASSWORD:
                case RANGE:
                case SEARCH:
                case TEXT:
                    // Simulate mouse click on the default form button for enter for these types of elements.
                    clickDefaultFormButton = true;
                    break;
                case BUTTON:
                case FILE:
                case IMAGE:
                case RESET:
                case SUBMIT:
                    // Simulate mouse click for enter for these types of elements.
                    clickElement = true;
                    break;
                case RADIO:
                    break; // Don't do anything for enter on a radio button.