rendertextcontrolsingleline.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) 2006, 2007 Apple Inc. All rights reserved.
 *           (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/) 
 *
 * 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 "RenderTextControlSingleLine.h"

#include "CSSStyleSelector.h"
#include "Event.h"
#include "EventNames.h"
#include "Frame.h"
#include "FrameView.h"
#include "HitTestResult.h"
#include "HTMLInputElement.h"
#include "HTMLNames.h"
#include "InputElement.h"
#include "LocalizedStrings.h"
#include "MouseEvent.h"
#include "PlatformKeyboardEvent.h"
#include "RenderScrollbar.h"
#include "RenderTheme.h"
#include "SearchPopupMenu.h"
#include "SelectionController.h"
#include "Settings.h"
#include "TextControlInnerElements.h"

using namespace std;

namespace WebCore {

using namespace HTMLNames;

RenderTextControlSingleLine::RenderTextControlSingleLine(Node* node)
    : RenderTextControl(node)
    , m_placeholderVisible(false)
    , m_searchPopupIsVisible(false)
    , m_shouldDrawCapsLockIndicator(false)
    , m_searchEventTimer(this, &RenderTextControlSingleLine::searchEventTimerFired)
    , m_searchPopup(0)
{
}

RenderTextControlSingleLine::~RenderTextControlSingleLine()
{
    if (m_searchPopup) {
        m_searchPopup->disconnectClient();
        m_searchPopup = 0;
    }
 
    if (m_innerBlock)
        m_innerBlock->detach();
}

bool RenderTextControlSingleLine::placeholderShouldBeVisible() const
{
    return inputElement()->placeholderShouldBeVisible();
}

void RenderTextControlSingleLine::updatePlaceholderVisibility()
{
    RenderStyle* parentStyle = m_innerBlock ? m_innerBlock->renderer()->style() : style();

    RefPtr<RenderStyle> textBlockStyle = createInnerTextStyle(parentStyle);
    HTMLElement* innerText = innerTextElement();
    innerText->renderer()->setStyle(textBlockStyle);

    for (Node* n = innerText->firstChild(); n; n = n->traverseNextNode(innerText)) {
        if (RenderObject* renderer = n->renderer())
            renderer->setStyle(textBlockStyle);
    }

    updateFromElement();
}

void RenderTextControlSingleLine::addSearchResult()
{
    ASSERT(node()->isHTMLElement());
    HTMLInputElement* input = static_cast<HTMLInputElement*>(node());
    if (input->maxResults() <= 0)
        return;

    String value = input->value();
    if (value.isEmpty())
        return;

    Settings* settings = document()->settings();
    if (!settings || settings->privateBrowsingEnabled())
        return;

    int size = static_cast<int>(m_recentSearches.size());
    for (int i = size - 1; i >= 0; --i) {
        if (m_recentSearches[i] == value)
            m_recentSearches.remove(i);
    }

    m_recentSearches.insert(0, value);
    while (static_cast<int>(m_recentSearches.size()) > input->maxResults())
        m_recentSearches.removeLast();

    const AtomicString& name = autosaveName();
    if (!m_searchPopup)
        m_searchPopup = SearchPopupMenu::create(this);

    m_searchPopup->saveRecentSearches(name, m_recentSearches);
}

void RenderTextControlSingleLine::stopSearchEventTimer()
{
    ASSERT(node()->isHTMLElement());
    m_searchEventTimer.stop();
}

void RenderTextControlSingleLine::showPopup()
{
    ASSERT(node()->isHTMLElement());
    if (m_searchPopupIsVisible)
        return;

    if (!m_searchPopup)
        m_searchPopup = SearchPopupMenu::create(this);

    if (!m_searchPopup->enabled())
        return;

    m_searchPopupIsVisible = true;

    const AtomicString& name = autosaveName();
    m_searchPopup->loadRecentSearches(name, m_recentSearches);

    // Trim the recent searches list if the maximum size has changed since we last saved.
    HTMLInputElement* input = static_cast<HTMLInputElement*>(node());
    if (static_cast<int>(m_recentSearches.size()) > input->maxResults()) {
        do {
            m_recentSearches.removeLast();
        } while (static_cast<int>(m_recentSearches.size()) > input->maxResults());

        m_searchPopup->saveRecentSearches(name, m_recentSearches);
    }

    m_searchPopup->show(absoluteBoundingBoxRect(true), document()->view(), -1);
}

void RenderTextControlSingleLine::hidePopup()
{
    ASSERT(node()->isHTMLElement());
    if (m_searchPopup)
        m_searchPopup->hide();

    m_searchPopupIsVisible = false;
}

void RenderTextControlSingleLine::subtreeHasChanged()
{
    bool wasEdited = isEdited();
    RenderTextControl::subtreeHasChanged();

    InputElement* input = inputElement();
    input->setValueFromRenderer(input->constrainValue(text()));

    if (RenderObject* cancelButtonRenderer = m_cancelButton ? m_cancelButton->renderer() : 0)
        updateCancelButtonVisibility(cancelButtonRenderer->style());

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

    if (!wasEdited && node()->focused()) {
        if (Frame* frame = document()->frame())
            frame->textFieldDidBeginEditing(static_cast<Element*>(node()));
    }

    if (node()->focused()) {
        if (Frame* frame = document()->frame())
            frame->textDidChangeInTextField(static_cast<Element*>(node()));
    }
}

void RenderTextControlSingleLine::paint(PaintInfo& paintInfo, int tx, int ty)
{
    RenderTextControl::paint(paintInfo, tx, ty);

    if (paintInfo.phase == PaintPhaseBlockBackground && m_shouldDrawCapsLockIndicator) {
        IntRect contentsRect = contentBoxRect();

        // Convert the rect into the coords used for painting the content
        contentsRect.move(tx + x(), ty + y());
        theme()->paintCapsLockIndicator(this, paintInfo, contentsRect);
    }
}

void RenderTextControlSingleLine::layout()
{
    int oldHeight = height();
    calcHeight();

    int oldWidth = width();
    calcWidth();

    bool relayoutChildren = oldHeight != height() || oldWidth != width();

    RenderBox* innerTextRenderer = innerTextElement()->renderBox();
    RenderBox* innerBlockRenderer = m_innerBlock ? m_innerBlock->renderBox() : 0;

    // Set the text block height
    int desiredHeight = textBlockHeight();
    int currentHeight = innerTextRenderer->height();

    if (m_innerBlock || currentHeight > height()) {
        if (desiredHeight != currentHeight)
            relayoutChildren = true;
        innerTextRenderer->style()->setHeight(Length(desiredHeight, Fixed));
    }

    if (m_innerBlock) {
        ASSERT(innerBlockRenderer);
        if (desiredHeight != innerBlockRenderer->height())
            relayoutChildren = true;
        innerBlockRenderer->style()->setHeight(Length(desiredHeight, Fixed));
    }

    // Set the text block width
    int desiredWidth = textBlockWidth();
    if (desiredWidth != innerTextRenderer->width())
        relayoutChildren = true;
    innerTextRenderer->style()->setWidth(Length(desiredWidth, Fixed));

    if (m_innerBlock) {
        int innerBlockWidth = width() - paddingLeft() - paddingRight() - borderLeft() - borderRight();
        if (innerBlockWidth != innerBlockRenderer->width())
            relayoutChildren = true;
        innerBlockRenderer->style()->setWidth(Length(innerBlockWidth, Fixed));
    }

    RenderBlock::layoutBlock(relayoutChildren);

    // For text fields, center the inner text vertically
    // Don't do this for search fields, since we don't honor height for them
    if (!m_innerBlock) {
        currentHeight = innerTextRenderer->height();
        if (currentHeight < height())
            innerTextRenderer->setLocation(innerTextRenderer->x(), (height() - currentHeight) / 2);
    }
}

bool RenderTextControlSingleLine::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, int xPos, int yPos, int tx, int ty, HitTestAction hitTestAction)
{
    // If we're within the text control, we want to act as if we've hit the inner text block element, in case the point
    // was on the control but not on the inner element (see Radar 4617841).

    // In a search field, we want to act as if we've hit the results block if we're to the left of the inner text block,
    // and act as if we've hit the close block if we're to the right of the inner text block.

    if (!RenderTextControl::nodeAtPoint(request, result, xPos, yPos, tx, ty, hitTestAction))
        return false;

    if (result.innerNode() != node() && result.innerNode() != innerTextElement())
        return false;

    hitInnerTextBlock(result, xPos, yPos, tx, ty);

    if (!m_innerBlock)
        return true;

    Node* innerNode = 0;
    RenderBox* innerBlockRenderer = m_innerBlock->renderBox();
    RenderBox* innerTextRenderer = innerTextElement()->renderBox();

    IntPoint localPoint = result.localPoint();
    localPoint.move(-innerBlockRenderer->x(), -innerBlockRenderer->y());

    int textLeft = tx + x() + innerBlockRenderer->x() + innerTextRenderer->x();
    if (m_resultsButton && m_resultsButton->renderer() && xPos < textLeft)
        innerNode = m_resultsButton.get();

    if (!innerNode) {
        int textRight = textLeft + innerTextRenderer->width();
        if (m_cancelButton && m_cancelButton->renderer() && xPos > textRight)
            innerNode = m_cancelButton.get();
    }

    if (innerNode) {
        result.setInnerNode(innerNode);
        localPoint.move(-innerNode->renderBox()->x(), -innerNode->renderBox()->y());
    }

    result.setLocalPoint(localPoint);
    return true;
}

void RenderTextControlSingleLine::forwardEvent(Event* event)
{
    RenderBox* innerTextRenderer = innerTextElement()->renderBox();

    if (event->type() == eventNames().blurEvent) {
        if (innerTextRenderer) {
            if (RenderLayer* innerLayer = innerTextRenderer->layer())
                innerLayer->scrollToOffset(style()->direction() == RTL ? innerLayer->scrollWidth() : 0, 0);
        }

        capsLockStateMayHaveChanged();
    } else if (event->type() == eventNames().focusEvent)
        capsLockStateMayHaveChanged();

    if (!event->isMouseEvent()) {
        RenderTextControl::forwardEvent(event);
        return;
    }

    FloatPoint localPoint = innerTextRenderer->absoluteToLocal(FloatPoint(static_cast<MouseEvent*>(event)->pageX(), static_cast<MouseEvent*>(event)->pageY()), false, true);
    if (m_resultsButton && localPoint.x() < innerTextRenderer->borderBoxRect().x())
        m_resultsButton->defaultEventHandler(event);
    else if (m_cancelButton && localPoint.x() > innerTextRenderer->borderBoxRect().right())
        m_cancelButton->defaultEventHandler(event);
    else
        RenderTextControl::forwardEvent(event);
}

void RenderTextControlSingleLine::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
{
    RenderTextControl::styleDidChange(diff, oldStyle);

    if (RenderObject* innerBlockRenderer = m_innerBlock ? m_innerBlock->renderer() : 0) {
        // We may have set the width and the height in the old style in layout().
        // Reset them now to avoid getting a spurious layout hint.
        innerBlockRenderer->style()->setHeight(Length());
        innerBlockRenderer->style()->setWidth(Length());
        innerBlockRenderer->setStyle(createInnerBlockStyle(style()));
    }

    if (RenderObject* resultsRenderer = m_resultsButton ? m_resultsButton->renderer() : 0)
        resultsRenderer->setStyle(createResultsButtonStyle(style()));

    if (RenderObject* cancelRenderer = m_cancelButton ? m_cancelButton->renderer() : 0)
        cancelRenderer->setStyle(createCancelButtonStyle(style()));
}

void RenderTextControlSingleLine::capsLockStateMayHaveChanged()
{
    if (!node() || !document())
        return;

    // Only draw the caps lock indicator if these things are true:
    // 1) The field is a password field
    // 2) The frame is active
    // 3) The element is focused
    // 4) The caps lock is on
    bool shouldDrawCapsLockIndicator = false;

    if (Frame* frame = document()->frame())
        shouldDrawCapsLockIndicator = inputElement()->isPasswordField()
                                      && frame->selection()->isFocusedAndActive()
                                      && document()->focusedNode() == node()
                                      && PlatformKeyboardEvent::currentCapsLockState();

    if (shouldDrawCapsLockIndicator != m_shouldDrawCapsLockIndicator) {
        m_shouldDrawCapsLockIndicator = shouldDrawCapsLockIndicator;
        repaint();
    }
}

int RenderTextControlSingleLine::textBlockWidth() const
{
    int width = RenderTextControl::textBlockWidth();

    if (RenderBox* resultsRenderer = m_resultsButton ? m_resultsButton->renderBox() : 0) {
        resultsRenderer->calcWidth();
        width -= resultsRenderer->width() + resultsRenderer->marginLeft() + resultsRenderer->marginRight();
    }

    if (RenderBox* cancelRenderer = m_cancelButton ? m_cancelButton->renderBox() : 0) {
        cancelRenderer->calcWidth();
        width -= cancelRenderer->width() + cancelRenderer->marginLeft() + cancelRenderer->marginRight();