katie/src/declarative/graphicsitems/qdeclarativetext.cpp

/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtDeclarative module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qdeclarativetext_p.h"
#include "qdeclarativetext_p_p.h"
#include <qdeclarativestyledtext_p.h>
#include <qdeclarativeinfo.h>
#include <qdeclarativepixmapcache_p.h>

#include <QSet>
#include <QTextLayout>
#include <QTextDocument>
#include <QGraphicsSceneEvent>
#include <QPainter>
#include <QAbstractTextDocumentLayout>
#include <qmath.h>
#include <limits.h>

QT_BEGIN_NAMESPACE

class QTextDocumentWithImageResources : public QTextDocument {
    Q_OBJECT

public:
    QTextDocumentWithImageResources(QDeclarativeText *parent);
    virtual ~QTextDocumentWithImageResources();

    void setText(const QString &);
    int resourcesLoading() const { return outstanding; }

protected:
    QVariant loadResource(int type, const QUrl &name);

private slots:
    void requestFinished();

private:
    QHash<QUrl, QDeclarativePixmap *> m_resources;

    int outstanding;
    static QSet<QUrl> errors;
};

DEFINE_BOOL_CONFIG_OPTION(enableImageCache, QML_ENABLE_TEXT_IMAGE_CACHE)

QString QDeclarativeTextPrivate::elideChar = QString(0x2026);

QDeclarativeTextPrivate::QDeclarativeTextPrivate()
: color((QRgb)0), style(QDeclarativeText::Normal), hAlign(QDeclarativeText::AlignLeft),
  vAlign(QDeclarativeText::AlignTop), elideMode(QDeclarativeText::ElideNone),
  format(QDeclarativeText::AutoText), wrapMode(QDeclarativeText::NoWrap), lineHeight(1),
  lineHeightMode(QDeclarativeText::ProportionalHeight), lineCount(1), truncated(false), maximumLineCount(INT_MAX),
  maximumLineCountValid(false), imageCacheDirty(true), updateOnComponentComplete(true), richText(false), singleline(false),
  cacheAllTextAsImage(true), internalWidthUpdate(false), requireImplicitWidth(false),  hAlignImplicit(true),
  rightToLeftText(false), layoutTextElided(false), naturalWidth(0), doc(0)
{
    cacheAllTextAsImage = enableImageCache();
    QGraphicsItemPrivate::acceptedMouseButtons = Qt::LeftButton;
    QGraphicsItemPrivate::flags = QGraphicsItemPrivate::flags & ~QGraphicsItem::ItemHasNoContents;
}

QTextDocumentWithImageResources::QTextDocumentWithImageResources(QDeclarativeText *parent) 
: QTextDocument(parent), outstanding(0)
{
}

QTextDocumentWithImageResources::~QTextDocumentWithImageResources()
{
    if (!m_resources.isEmpty()) 
        qDeleteAll(m_resources);
}

QVariant QTextDocumentWithImageResources::loadResource(int type, const QUrl &name)
{
    QDeclarativeContext *context = qmlContext(parent());
    QUrl url = context->resolvedUrl(name);

    if (type == QTextDocument::ImageResource) {
        QHash<QUrl, QDeclarativePixmap *>::Iterator iter = m_resources.find(url);

        if (iter == m_resources.end()) {
            QDeclarativePixmap *p = new QDeclarativePixmap(context->engine(), url);
            iter = m_resources.insert(name, p);

            if (p->isLoading()) {
                p->connectFinished(this, SLOT(requestFinished()));
                outstanding++;
            }
        }

        QDeclarativePixmap *p = *iter;
        if (p->isReady()) {
            return p->pixmap();
        } else if (p->isError()) {
            if (!errors.contains(url)) {
                errors.insert(url);
                qmlInfo(parent()) << p->error();
            }
        }
    }

    return QTextDocument::loadResource(type,url); // The *resolved* URL
}

void QTextDocumentWithImageResources::requestFinished()
{
    outstanding--;
    if (outstanding == 0) {
        QDeclarativeText *textItem = static_cast<QDeclarativeText*>(parent());
        QString text = textItem->text();
#ifndef QT_NO_TEXTHTMLPARSER
        setHtml(text);
#else
        setPlainText(text);
#endif
        QDeclarativeTextPrivate *d = QDeclarativeTextPrivate::get(textItem);
        d->updateLayout();
    }
}

void QTextDocumentWithImageResources::setText(const QString &text)
{
    if (!m_resources.isEmpty()) {
        qDeleteAll(m_resources);
        m_resources.clear();
        outstanding = 0;
    }

#ifndef QT_NO_TEXTHTMLPARSER
    setHtml(text);
#else
    setPlainText(text);
#endif
}

QSet<QUrl> QTextDocumentWithImageResources::errors;

QDeclarativeTextPrivate::~QDeclarativeTextPrivate()
{
}

qreal QDeclarativeTextPrivate::implicitWidth() const
{
    if (!requireImplicitWidth) {
        // We don't calculate implicitWidth unless it is required.
        // We need to force a size update now to ensure implicitWidth is calculated
        QDeclarativeTextPrivate *me = const_cast<QDeclarativeTextPrivate*>(this);
        me->requireImplicitWidth = true;
        me->updateSize();
    }
    return mImplicitWidth;
}

void QDeclarativeTextPrivate::updateLayout()
{
    Q_Q(QDeclarativeText);
    if (!q->isComponentComplete()) {
        updateOnComponentComplete = true;
        return;
    }

    layoutTextElided = false;
    // Setup instance of QTextLayout for all cases other than richtext
    if (!richText) {
        layout.clearLayout();
        layout.setFont(font);
        if (format != QDeclarativeText::StyledText) {
            QString tmp = text;
            tmp.replace(QLatin1Char('\n'), QChar::LineSeparator);
            singleline = !tmp.contains(QChar::LineSeparator);
            if (singleline && !maximumLineCountValid && elideMode != QDeclarativeText::ElideNone && q->widthValid()) {
                QFontMetrics fm(font);
                tmp = fm.elidedText(tmp,(Qt::TextElideMode)elideMode,q->width());
                if (tmp != text) {
                    layoutTextElided = true;
                    if (!truncated) {
                        truncated = true;
                        emit q->truncatedChanged();
                    }
                }
            }
            layout.setText(tmp);
        } else {
            singleline = false;
            QDeclarativeStyledText::parse(text, layout);
        }
    }

    updateSize();
}

void QDeclarativeTextPrivate::updateSize()
{
    Q_Q(QDeclarativeText);

    if (!q->isComponentComplete()) {
        updateOnComponentComplete = true;
        return;
    }

    if (!requireImplicitWidth) {
        emit q->implicitWidthChanged();
        // if the implicitWidth is used, then updateSize() has already been called (recursively)
        if (requireImplicitWidth)
            return;
    }

    invalidateImageCache();

    QFontMetrics fm(font);
    if (text.isEmpty()) {
        q->setImplicitWidth(0);
        q->setImplicitHeight(fm.height());
        paintedSize = QSize(0, fm.height());
        emit q->paintedSizeChanged();
        q->update();
        return;
    }

    int dy = q->height();
    QSize size(0, 0);

    //setup instance of QTextLayout for all cases other than richtext
    if (!richText) {
        QRect textRect = setupTextLayout();
        if (layedOutTextRect.size() != textRect.size())
            q->prepareGeometryChange();
        layedOutTextRect = textRect;
        size = textRect.size();
        dy -= size.height();
    } else {
        singleline = false; // richtext can't elide or be optimized for single-line case
        ensureDoc();
        doc->setDefaultFont(font);

        QDeclarativeText::HAlignment horizontalAlignment = q->effectiveHAlign();
        if (rightToLeftText) {
            if (horizontalAlignment == QDeclarativeText::AlignLeft)
                horizontalAlignment = QDeclarativeText::AlignRight;
            else if (horizontalAlignment == QDeclarativeText::AlignRight)
                horizontalAlignment = QDeclarativeText::AlignLeft;
        }
        QTextOption option;
        option.setAlignment((Qt::Alignment)int(horizontalAlignment | vAlign));
        option.setWrapMode(QTextOption::WrapMode(wrapMode));
        doc->setDefaultTextOption(option);
        if (requireImplicitWidth && q->widthValid()) {
            doc->setTextWidth(-1);
            naturalWidth = doc->idealWidth();
        }
        if (q->widthValid())
            doc->setTextWidth(q->width());
        else
            doc->setTextWidth(doc->idealWidth()); // ### Text does not align if width is not set (QTextDoc bug)
        dy -= (int)doc->size().height();
        QSize dsize = doc->size().toSize();
        if (dsize != layedOutTextRect.size()) {
            q->prepareGeometryChange();
            layedOutTextRect = QRect(QPoint(0,0), dsize);
        }
        size = QSize(int(doc->idealWidth()),dsize.height());
    }
    int yoff = 0;

    if (q->heightValid()) {
        if (vAlign == QDeclarativeText::AlignBottom)
            yoff = dy;
        else if (vAlign == QDeclarativeText::AlignVCenter)
            yoff = dy/2;
    }
    q->setBaselineOffset(fm.ascent() + yoff);

    //### need to comfirm cost of always setting these for richText
    internalWidthUpdate = true;
    if (!q->widthValid())
        q->setImplicitWidth(size.width());
    else if (requireImplicitWidth)
        q->setImplicitWidth(naturalWidth);
    internalWidthUpdate = false;
    q->setImplicitHeight(size.height());
    if (paintedSize != size) {
        paintedSize = size;
        emit q->paintedSizeChanged();
    }
    q->update();
}

/*!
    Lays out the QDeclarativeTextPrivate::layout QTextLayout in the constraints of the QDeclarativeText.

    Returns the size of the final text.  This can be used to position the text vertically (the text is
    already absolutely positioned horizontally).
*/
QRect QDeclarativeTextPrivate::setupTextLayout()
{
    // ### text layout handling should be profiled and optimized as needed
    // what about QStackTextEngine engine(tmp, d->font.font()); QTextLayout textLayout(&engine);
    Q_Q(QDeclarativeText);
    layout.setCacheEnabled(true);

    qreal lineWidth = 0;
    int visibleCount = 0;

    //set manual width
    if (q->widthValid())
        lineWidth = q->width();

    QTextOption textOption = layout.textOption();
    textOption.setAlignment(Qt::Alignment(q->effectiveHAlign()));
    textOption.setWrapMode(QTextOption::WrapMode(wrapMode));
    layout.setTextOption(textOption);

    bool elideText = false;
    bool truncate = false;

    QFontMetrics fm(layout.font());
    elidePos = QPointF();

    if (requireImplicitWidth && q->widthValid()) {
        // requires an extra layout
        QString elidedText;
        if (layoutTextElided) {
            // We have provided elided text to the layout, but we must calculate unelided width.
            elidedText = layout.text();
            layout.setText(text);
        }
        layout.beginLayout();
        forever {
            QTextLine line = layout.createLine();
            if (!line.isValid())
                break;
        }
        layout.endLayout();
        QRectF br;
        for (int i = 0; i < layout.lineCount(); ++i) {
            QTextLine line = layout.lineAt(i);
            br = br.united(line.naturalTextRect());
        }
        naturalWidth = br.width();
        if (layoutTextElided)
            layout.setText(elidedText);
    }

    if (maximumLineCountValid) {
        layout.beginLayout();
        if (!lineWidth)
            lineWidth = INT_MAX;
        int linesLeft = maximumLineCount;
        int visibleTextLength = 0;
        while (linesLeft > 0) {
            QTextLine line = layout.createLine();
            if (!line.isValid())
                break;

            visibleCount++;
            if (lineWidth)
                line.setLineWidth(lineWidth);
            visibleTextLength += line.textLength();

            if (--linesLeft == 0) {
                if (visibleTextLength < text.length()) {
                    truncate = true;
                    if (elideMode==QDeclarativeText::ElideRight && q->widthValid()) {
                        qreal elideWidth = fm.width(elideChar);
                        // Need to correct for alignment
                        line.setLineWidth(lineWidth-elideWidth);
                        if (layout.text().mid(line.textStart(), line.textLength()).isRightToLeft()) {
                            line.setPosition(QPointF(line.position().x() + elideWidth, line.position().y()));
                            elidePos.setX(line.naturalTextRect().left() - elideWidth);
                        } else {
                            elidePos.setX(line.naturalTextRect().right());
                        }
                        elideText = true;
                    }
                }
            }
        }
        layout.endLayout();

        //Update truncated
        if (truncated != truncate) {
            truncated = truncate;
            emit q->truncatedChanged();
        }
    } else {
        layout.beginLayout();
        forever {
            QTextLine line = layout.createLine();
            if (!line.isValid())
                break;
            visibleCount++;
            if (lineWidth)
                line.setLineWidth(lineWidth);
        }
        layout.endLayout();
    }

    qreal height = 0;
    QRectF br;
    for (int i = 0; i < layout.lineCount(); ++i) {
        QTextLine line = layout.lineAt(i);
        // set line spacing
        line.setPosition(QPointF(line.position().x(), height));
        if (elideText && i == layout.lineCount()-1) {
            elidePos.setY(height + fm.ascent());
            br = br.united(QRectF(elidePos, QSizeF(fm.width(elideChar), fm.ascent())));
        }
        br = br.united(line.naturalTextRect());
        height += (lineHeightMode == QDeclarativeText::FixedHeight) ? lineHeight : line.height() * lineHeight;
    }
    br.setHeight(height);

    if (!q->widthValid())
        naturalWidth = br.width();

    //Update the number of visible lines
    if (lineCount != visibleCount) {
        lineCount = visibleCount;
        emit q->lineCountChanged();
    }

    return QRect(qRound(br.x()), qRound(br.y()), qCeil(br.width()), qCeil(br.height()));
}

/*!
    Returns a painted version of the QDeclarativeTextPrivate::layout QTextLayout.
    If \a drawStyle is true, the style color overrides all colors in the document.
*/
QPixmap QDeclarativeTextPrivate::textLayoutImage(bool drawStyle)
{
    //do layout
    QSize size = layedOutTextRect.size();
    //paint text
    QPixmap img(size);
    if (!size.isEmpty()) {
        img.fill(Qt::transparent);
        QPainter p(&img);
        drawTextLayout(&p, QPointF(-layedOutTextRect.x(),0), drawStyle);
    }
    return img;
}

/*!
    Paints the QDeclarativeTextPrivate::layout QTextLayout into \a painter at \a pos.  If 
    \a drawStyle is true, the style color overrides all colors in the document.
*/
void QDeclarativeTextPrivate::drawTextLayout(QPainter *painter, const QPointF &pos, bool drawStyle)
{
    if (drawStyle)
        painter->setPen(styleColor);
    else
        painter->setPen(color);
    painter->setFont(font);
    layout.draw(painter, pos);
    if (!elidePos.isNull())
        painter->drawText(pos + elidePos, elideChar);
}

/*!
    Returns a painted version of the QDeclarativeTextPrivate::doc QTextDocument.
    If \a drawStyle is true, the style color overrides all colors in the document.
*/
QPixmap QDeclarativeTextPrivate::textDocumentImage(bool drawStyle)
{
    QSize size = doc->size().toSize();

    //paint text
    QPixmap img(size);
    img.fill(Qt::transparent);
    QPainter p(&img);

    QAbstractTextDocumentLayout::PaintContext context;

    QTextOption oldOption(doc->defaultTextOption());
    if (drawStyle) {
        context.palette.setColor(QPalette::Text, styleColor);
        QTextOption colorOption(doc->defaultTextOption());
        colorOption.setFlags(QTextOption::SuppressColors);
        doc->setDefaultTextOption(colorOption);
    } else {
        context.palette.setColor(QPalette::Text, color);
    }
    doc->documentLayout()->draw(&p, context);
    if (drawStyle)
        doc->setDefaultTextOption(oldOption);
    return img;
}

/*!
    Mark the image cache as dirty.
*/
void QDeclarativeTextPrivate::invalidateImageCache() 
{
    Q_Q(QDeclarativeText);

    if(cacheAllTextAsImage || style != QDeclarativeText::Normal){//If actually using the image cache
        if (imageCacheDirty)
            return;

        imageCacheDirty = true;
        imageCache = QPixmap();
    }
    if (q->isComponentComplete())
        q->update();
}

/*!
    Tests if the image cache is dirty, and repaints it if it is.
*/
void QDeclarativeTextPrivate::checkImageCache()
{
    if (!imageCacheDirty)
        return;

    if (text.isEmpty()) {

        imageCache = QPixmap();

    } else {

        QPixmap textImage;
        QPixmap styledImage;

        if (richText) {
            textImage = textDocumentImage(false);
            if (style != QDeclarativeText::Normal)
                styledImage = textDocumentImage(true); //### should use styleColor
        } else {
            textImage = textLayoutImage(false);
            if (style != QDeclarativeText::Normal)
                styledImage = textLayoutImage(true); //### should use styleColor
        }

        switch (style) {
        case QDeclarativeText::Outline:
            imageCache = drawOutline(textImage, styledImage);
            break;
        case QDeclarativeText::Sunken:
            imageCache = drawOutline(textImage, styledImage, -1);
            break;
        case QDeclarativeText::Raised:
            imageCache = drawOutline(textImage, styledImage, 1);
            break;
        default:
            imageCache = textImage;
            break;
        }

    } 

    imageCacheDirty = false;
}

/*! 
    Ensures the QDeclarativeTextPrivate::doc variable is set to a valid text document 
*/
void QDeclarativeTextPrivate::ensureDoc()
{
    if (!doc) {
        Q_Q(QDeclarativeText);
        doc = new QTextDocumentWithImageResources(q);
        doc->setDocumentMargin(0);
    }
}

/*!
    Draw \a styleSource as an outline around \a source and return the new image.
*/
QPixmap QDeclarativeTextPrivate::drawOutline(const QPixmap &source, const QPixmap &styleSource)
{
    QPixmap img = QPixmap(styleSource.width() + 2, styleSource.height() + 2);
    img.fill(Qt::transparent);

    QPainter ppm(&img);

    QPoint pos(0, 0);
    pos += QPoint(-1, 0);
    ppm.drawPixmap(pos, styleSource);
    pos += QPoint(2, 0);
    ppm.drawPixmap(pos, styleSource);
    pos += QPoint(-1, -1);
    ppm.drawPixmap(pos, styleSource);
    pos += QPoint(0, 2);
    ppm.drawPixmap(pos, styleSource);

    pos += QPoint(0, -1);
    ppm.drawPixmap(pos, source);
    ppm.end();

    return img;
}

/*!
    Draw \a styleSource below \a source at \a yOffset and return the new image.
*/
QPixmap QDeclarativeTextPrivate::drawOutline(const QPixmap &source, const QPixmap &styleSource, int yOffset)
{
    QPixmap img = QPixmap(styleSource.width() + 2, styleSource.height() + 2);
    img.fill(Qt::transparent);

    QPainter ppm(&img);

    ppm.drawPixmap(QPoint(0, yOffset), styleSource);
    ppm.drawPixmap(0, 0, source);

    ppm.end();

    return img;
}

/*!
    \qmlclass Text QDeclarativeText
    \ingroup qml-basic-visual-elements
    \since 4.7
    \brief The Text item allows you to add formatted text to a scene.
    \inherits Item

    Text items can display both plain and rich text. For example, red text with
    a specific font and size can be defined like this:

    \qml
    Text {
        text: "Hello World!"
        font.family: "Helvetica"
        font.pointSize: 24
        color: "red"
    }
    \endqml

    Rich text is defined using HTML-style markup:

    \qml
    Text {
        text: "<b>Hello</b> <i>World!</i>"
    }
    \endqml

    \image declarative-text.png

    If height and width are not explicitly set, Text will attempt to determine how
    much room is needed and set it accordingly. Unless \l wrapMode is set, it will always
    prefer width to height (all text will be placed on a single line).

    The \l elide property can alternatively be used to fit a single line of
    plain text to a set width.

    Note that the \l{Supported HTML Subset} is limited. Also, if the text contains
    HTML img tags that load remote images, the text is reloaded.

    Text provides read-only text. For editable text, see \l TextEdit.

    \sa {declarative/text/fonts}{Fonts example}
*/
QDeclarativeText::QDeclarativeText(QDeclarativeItem *parent)
  : QDeclarativeImplicitSizeItem(*(new QDeclarativeTextPrivate), parent)
{
}

QDeclarativeText::~QDeclarativeText()
{
}

/*!
  \qmlproperty bool Text::clip
  This property holds whether the text is clipped.

  Note that if the text does not fit in the bounding rectangle it will be abruptly chopped.

  If you want to display potentially long text in a limited space, you probably want to use \c elide instead.
*/

/*!
    \qmlproperty bool Text::smooth

    This property holds whether the text is smoothly scaled or transformed.

    Smooth filtering gives better visual quality, but is slower.  If
    the item is displayed at its natural size, this property has no visual or
    performance effect.

    \note Generally scaling artifacts are only visible if the item is stationary on
    the screen.  A common pattern when animating an item is to disable smooth
    filtering at the beginning of the animation and reenable it at the conclusion.
*/

/*!
    \qmlsignal Text::onLinkActivated(string link)

    This handler is called when the user clicks on a link embedded in the text.
    The link must be in rich text or HTML format and the 
    \a link string provides access to the particular link. 

    \snippet doc/src/snippets/declarative/text/onLinkActivated.qml 0

    The example code will display the text 
    "The main website is at \l{http://qt.nokia.com}{Nokia Qt DF}."

    Clicking on the highlighted link will output 
    \tt{http://qt.nokia.com link activated} to the console.
*/

/*!
    \qmlproperty string Text::font.family

    Sets the family name of the font.

    The family name is case insensitive and may optionally include a foundry name, e.g. "Helvetica [Cronyx]".
    If the family is available from more than one foundry and the foundry isn't specified, an arbitrary foundry is chosen.
    If the family isn't available a family will be set using the font matching algorithm.
*/

/*!
    \qmlproperty bool Text::font.bold

    Sets whether the font weight is bold.
*/

/*!
    \qmlproperty enumeration Text::font.weight

    Sets the font's weight.

    The weight can be one of:
    \list
    \o Font.Light
    \o Font.Normal - the default
    \o Font.DemiBold
    \o Font.Bold
    \o Font.Black
    \endlist

    \qml
    Text { text: "Hello"; font.weight: Font.DemiBold }
    \endqml
*/

/*!
    \qmlproperty bool Text::font.italic

    Sets whether the font has an italic style.
*/

/*!
    \qmlproperty bool Text::font.underline

    Sets whether the text is underlined.
*/

/*!
    \qmlproperty bool Text::font.strikeout

    Sets whether the font has a strikeout style.
*/

/*!
    \qmlproperty real Text::font.pointSize

    Sets the font size in points. The point size must be greater than zero.
*/

/*!
    \qmlproperty int Text::font.pixelSize

    Sets the font size in pixels.

    Using this function makes the font device dependent.
    Use \c pointSize to set the size of the font in a device independent manner.
*/

/*!
    \qmlproperty real Text::font.letterSpacing

    Sets the letter spacing for the font.

    Letter spacing changes the default spacing between individual letters in the font.
    A positive value increases the letter spacing by the corresponding pixels; a negative value decreases the spacing.
*/

/*!
    \qmlproperty real Text::font.wordSpacing

    Sets the word spacing for the font.

    Word spacing changes the default spacing between individual words.
    A positive value increases the word spacing by a corresponding amount of pixels,
    while a negative value decreases the inter-word spacing accordingly.
*/

/*!
    \qmlproperty enumeration Text::font.capitalization

    Sets the capitalization for the text.

    \list
    \o Font.MixedCase - This is the normal text rendering option where no capitalization change is applied.
    \o Font.AllUppercase - This alters the text to be rendered in all uppercase type.
    \o Font.AllLowercase	 - This alters the text to be rendered in all lowercase type.
    \o Font.SmallCaps -	This alters the text to be rendered in small-caps type.
    \o Font.Capitalize - This alters the text to be rendered with the first character of each word as an uppercase character.
    \endlist

    \qml
    Text { text: "Hello"; font.capitalization: Font.AllLowercase }
    \endqml
*/
QFont QDeclarativeText::font() const
{
    Q_D(const QDeclarativeText);
    return d->sourceFont;
}

void QDeclarativeText::setFont(const QFont &font)
{
    Q_D(QDeclarativeText);
    if (d->sourceFont == font)
        return;

    d->sourceFont = font;
    QFont oldFont = d->font;
    d->font = font;
    if (d->font.pointSizeF() != -1) {
        // 0.5pt resolution
        qreal size = qRound(d->font.pointSizeF()*2.0);
        d->font.setPointSizeF(size/2.0);
    }

    if (oldFont != d->font)
        d->updateLayout();

    emit fontChanged(d->sourceFont);
}

/*!
    \qmlproperty string Text::text

    The text to display. Text supports both plain and rich text strings.

    The item will try to automatically determine whether the text should
    be treated as rich text. This determination is made using Qt::mightBeRichText().
*/
QString QDeclarativeText::text() const
{
    Q_D(const QDeclarativeText);
    return d->text;
}

void QDeclarativeText::setText(const QString &n)
{
    Q_D(QDeclarativeText);
    if (d->text == n)
        return;

    d->richText = d->format == RichText || (d->format == AutoText && Qt::mightBeRichText(n));
    d->text = n;
    if (isComponentComplete()) {
        if (d->richText) {
            d->ensureDoc();
            d->doc->setText(n);
            d->rightToLeftText = d->doc->toPlainText().isRightToLeft();
        } else {
            d->rightToLeftText = d->text.isRightToLeft();
        }
        d->determineHorizontalAlignment();
    }
    d->updateLayout();
    emit textChanged(d->text);
}


/*!
    \qmlproperty color Text::color

    The text color.

    An example of green text defined using hexadecimal notation:
    \qml
    Text {
        color: "#00FF00"
        text: "green text"
    }
    \endqml

    An example of steel blue text defined using an SVG color name:
    \qml
    Text {
        color: "steelblue"
        text: "blue text"
    }
    \endqml
*/
QColor QDeclarativeText::color() const
{
    Q_D(const QDeclarativeText);
    return d->color;
}

void QDeclarativeText::setColor(const QColor &color)
{
    Q_D(QDeclarativeText);
    if (d->color == color)
        return;

    d->color = color;
    d->invalidateImageCache();
    emit colorChanged(d->color);
}

/*!
    \qmlproperty enumeration Text::style

    Set an additional text style.

    Supported text styles are:
    \list
    \o Text.Normal - the default
    \o Text.Outline
    \o Text.Raised
    \o Text.Sunken
    \endlist

    \qml
    Row {
        Text { font.pointSize: 24; text: "Normal" }
        Text { font.pointSize: 24; text: "Raised"; style: Text.Raised; styleColor: "#AAAAAA" }
        Text { font.pointSize: 24; text: "Outline";style: Text.Outline; styleColor: "red" }
        Text { font.pointSize: 24; text: "Sunken"; style: Text.Sunken; styleColor: "#AAAAAA" }
    }
    \endqml

    \image declarative-textstyle.png
*/
QDeclarativeText::TextStyle QDeclarativeText::style() const
{
    Q_D(const QDeclarativeText);
    return d->style;
}

void QDeclarativeText::setStyle(QDeclarativeText::TextStyle style)
{
    Q_D(QDeclarativeText);
    if (d->style == style)
        return;

    // changing to/from Normal requires the boundingRect() to change
    if (isComponentComplete() && (d->style == Normal || style == Normal))
        prepareGeometryChange();
    d->style = style;
    d->invalidateImageCache();
    emit styleChanged(d->style);
}

/*!
    \qmlproperty color Text::styleColor

    Defines the secondary color used by text styles.

    \c styleColor is used as the outline color for outlined text, and as the
    shadow color for raised or sunken text. If no style has been set, it is not
    used at all.

    \qml
    Text { font.pointSize: 18; text: "hello"; style: Text.Raised; styleColor: "gray" }
    \endqml

    \sa style
 */
QColor QDeclarativeText::styleColor() const
{
    Q_D(const QDeclarativeText);
    return d->styleColor;
}

void QDeclarativeText::setStyleColor(const QColor &color)
{
    Q_D(QDeclarativeText);
    if (d->styleColor == color)
        return;

    d->styleColor = color;
    d->invalidateImageCache();
    emit styleColorChanged(d->styleColor);
}


/*!
    \qmlproperty enumeration Text::horizontalAlignment
    \qmlproperty enumeration Text::verticalAlignment

    Sets the horizontal and vertical alignment of the text within the Text items
    width and height. By default, the text is vertically aligned to the top. Horizontal
    alignment follows the natural alignment of the text, for example text that is read
    from left to right will be aligned to the left.

    The valid values for \c horizontalAlignment are \c Text.AlignLeft, \c Text.AlignRight, \c Text.AlignHCenter and
    \c Text.AlignJustify.  The valid values for \c verticalAlignment are \c Text.AlignTop, \c Text.AlignBottom
    and \c Text.AlignVCenter.

    Note that for a single line of text, the size of the text is the area of the text. In this common case,
    all alignments are equivalent. If you want the text to be, say, centered in its parent, then you will
    need to either modify the Item::anchors, or set horizontalAlignment to Text.AlignHCenter and bind the width to 
    that of the parent.

    When using the attached property \l {LayoutMirroring::enabled} to mirror application
    layouts, the horizontal alignment of text will also be mirrored. However, the property
    \c horizontalAlignment will remain unchanged. To query the effective horizontal alignment
    of Text, use the property \l {LayoutMirroring::enabled}.
*/
QDeclarativeText::HAlignment QDeclarativeText::hAlign() const
{
    Q_D(const QDeclarativeText);
    return d->hAlign;
}

void QDeclarativeText::setHAlign(HAlignment align)
{
    Q_D(QDeclarativeText);
    bool forceAlign = d->hAlignImplicit && d->effectiveLayoutMirror;
    d->hAlignImplicit = false;
    if (d->setHAlign(align, forceAlign) && isComponentComplete())
        d->updateLayout();
}

void QDeclarativeText::resetHAlign()
{
    Q_D(QDeclarativeText);
    d->hAlignImplicit = true;
    if (d->determineHorizontalAlignment() && isComponentComplete())
        d->updateLayout();
}

QDeclarativeText::HAlignment QDeclarativeText::effectiveHAlign() const
{
    Q_D(const QDeclarativeText);
    QDeclarativeText::HAlignment effectiveAlignment = d->hAlign;
    if (!d->hAlignImplicit && d->effectiveLayoutMirror) {
        switch (d->hAlign) {
        case QDeclarativeText::AlignLeft:
            effectiveAlignment = QDeclarativeText::AlignRight;
            break;
        case QDeclarativeText::AlignRight:
            effectiveAlignment = QDeclarativeText::AlignLeft;
            break;
        default:
            break;
        }
    }
    return effectiveAlignment;
}

bool QDeclarativeTextPrivate::setHAlign(QDeclarativeText::HAlignment alignment, bool forceAlign)
{
    Q_Q(QDeclarativeText);
    if (hAlign != alignment || forceAlign) {
        hAlign = alignment;
        emit q->horizontalAlignmentChanged(hAlign);
        return true;
    }
    return false;
}

bool QDeclarativeTextPrivate::determineHorizontalAlignment()
{
    Q_Q(QDeclarativeText);
    if (hAlignImplicit && q->isComponentComplete()) {
        bool alignToRight = text.isEmpty() ? QApplication::keyboardInputDirection() == Qt::RightToLeft : rightToLeftText;
        return setHAlign(alignToRight ? QDeclarativeText::AlignRight : QDeclarativeText::AlignLeft);
    }
    return false;
}

void QDeclarativeTextPrivate::mirrorChange()
{
    Q_Q(QDeclarativeText);
    if (q->isComponentComplete()) {
        if (!hAlignImplicit && (hAlign == QDeclarativeText::AlignRight || hAlign == QDeclarativeText::AlignLeft)) {
            updateLayout();
        }
    }
}

QTextDocument *QDeclarativeTextPrivate::textDocument()
{
    return doc;
}

QDeclarativeText::VAlignment QDeclarativeText::vAlign() const
{
    Q_D(const QDeclarativeText);
    return d->vAlign;
}

void QDeclarativeText::setVAlign(VAlignment align)
{
    Q_D(QDeclarativeText);
    if (d->vAlign == align)
        return;

    if (isComponentComplete())
        prepareGeometryChange();
    d->vAlign = align;
    emit verticalAlignmentChanged(align);
}

/*!
    \qmlproperty enumeration Text::wrapMode

    Set this property to wrap the text to the Text item's width.  The text will only
    wrap if an explicit width has been set.  wrapMode can be one of:

    \list
    \o Text.NoWrap (default) - no wrapping will be performed. If the text contains insufficient newlines, then \l paintedWidth will exceed a set width.
    \o Text.WordWrap - wrapping is done on word boundaries only. If a word is too long, \l paintedWidth will exceed a set width.
    \o Text.WrapAnywhere - wrapping is done at any point on a line, even if it occurs in the middle of a word.
    \o Text.Wrap - if possible, wrapping occurs at a word boundary; otherwise it will occur at the appropriate point on the line, even in the middle of a word.
    \endlist
*/
QDeclarativeText::WrapMode QDeclarativeText::wrapMode() const
{
    Q_D(const QDeclarativeText);
    return d->wrapMode;
}

void QDeclarativeText::setWrapMode(WrapMode mode)
{
    Q_D(QDeclarativeText);
    if (mode == d->wrapMode)
        return;

    d->wrapMode = mode;
    d->updateLayout();
    
    emit wrapModeChanged();
}

/*!
    \qmlproperty int Text::lineCount
    \since QtQuick 1.1

    Returns the number of lines visible in the text item.

    This property is not supported for rich text.

    \sa maximumLineCount
*/
int QDeclarativeText::lineCount() const
{
    Q_D(const QDeclarativeText);
    return d->lineCount;
}

/*!
    \qmlproperty bool Text::truncated
    \since QtQuick 1.1

    Returns true if the text has been truncated due to \l maximumLineCount
    or \l elide.

    This property is not supported for rich text.

    \sa maximumLineCount, elide
*/
bool QDeclarativeText::truncated() const
{
    Q_D(const QDeclarativeText);
    return d->truncated;
}

/*!
    \qmlproperty int Text::maximumLineCount
    \since QtQuick 1.1

    Set this property to limit the number of lines that the text item will show.
    If elide is set to Text.ElideRight, the text will be elided appropriately.
    By default, this is the value of the largest possible integer.

    This property is not supported for rich text.

    \sa lineCount, elide
*/
int QDeclarativeText::maximumLineCount() const
{
    Q_D(const QDeclarativeText);
    return d->maximumLineCount;
}

void QDeclarativeText::setMaximumLineCount(int lines)
{
    Q_D(QDeclarativeText);

    d->maximumLineCountValid = lines==INT_MAX ? false : true;
    if (d->maximumLineCount != lines) {
        d->maximumLineCount = lines;
        d->updateLayout();
        emit maximumLineCountChanged();
    }
}

void QDeclarativeText::resetMaximumLineCount()
{
    Q_D(QDeclarativeText);
    setMaximumLineCount(INT_MAX);
    d->elidePos = QPointF();
    if (d->truncated != false) {
        d->truncated = false;
        emit truncatedChanged();
    }
}

/*!
    \qmlproperty enumeration Text::textFormat

    The way the text property should be displayed.

    Supported text formats are:
    
    \list
    \o Text.AutoText (default)
    \o Text.PlainText
    \o Text.RichText
    \o Text.StyledText
    \endlist

    If the text format is \c Text.AutoText the text element
    will automatically determine whether the text should be treated as
    rich text.  This determination is made using Qt::mightBeRichText().

    Text.StyledText is an optimized format supporting some basic text
    styling markup, in the style of html 3.2:

    \code
    <font size="4" color="#ff0000">font size and color</font>
    <b>bold</b>
    <i>italic</i>
    <br>
    &gt; &lt; &amp;
    \endcode

    \c Text.StyledText parser is strict, requiring tags to be correctly nested.

    \table
    \row
    \o
    \qml
Column {
    Text {
        font.pointSize: 24
        text: "<b>Hello</b> <i>World!</i>"
    }
    Text {
        font.pointSize: 24
        textFormat: Text.RichText
        text: "<b>Hello</b> <i>World!</i>"
    }
    Text {
        font.pointSize: 24
        textFormat: Text.PlainText
        text: "<b>Hello</b> <i>World!</i>"
    }
}
    \endqml
    \o \image declarative-textformat.png
    \endtable
*/
QDeclarativeText::TextFormat QDeclarativeText::textFormat() const
{
    Q_D(const QDeclarativeText);
    return d->format;
}

void QDeclarativeText::setTextFormat(TextFormat format)
{
    Q_D(QDeclarativeText);
    if (format == d->format)
        return;
    d->format = format;
    bool wasRich = d->richText;
    d->richText = format == RichText || (format == AutoText && Qt::mightBeRichText(d->text));

    if (!wasRich && d->richText && isComponentComplete()) {
        d->ensureDoc();
        d->doc->setText(d->text);
    }

    d->updateLayout();

    emit textFormatChanged(d->format);
}

/*!
    \qmlproperty enumeration Text::elide

    Set this property to elide parts of the text fit to the Text item's width.
    The text will only elide if an explicit width has been set.

    This property cannot be used with rich text.

    Eliding can be:
    \list
    \o Text.ElideNone  - the default
    \o Text.ElideLeft
    \o Text.ElideMiddle
    \o Text.ElideRight
    \endlist

    If this property is set to Text.ElideRight, it can be used with multiline
    text. The text will only elide if maximumLineCount has been set.

    If the text is a multi-length string, and the mode is not \c Text.ElideNone,
    the first string that fits will be used, otherwise the last will be elided.

    Multi-length strings are ordered from longest to shortest, separated by the
    Unicode "String Terminator" character \c U009C (write this in QML with \c{"\u009C"} or \c{"\x9C"}).
*/
QDeclarativeText::TextElideMode QDeclarativeText::elideMode() const
{
    Q_D(const QDeclarativeText);
    return d->elideMode;
}

void QDeclarativeText::setElideMode(QDeclarativeText::TextElideMode mode)
{
    Q_D(QDeclarativeText);
    if (mode == d->elideMode)
        return;

    d->elideMode = mode;
    d->updateLayout();
    
    emit elideModeChanged(d->elideMode);
}

/*! \internal */
QRectF QDeclarativeText::boundingRect() const
{
    Q_D(const QDeclarativeText);

    QRect rect = d->layedOutTextRect;
    if (d->style != Normal)
        rect.adjust(-1, 0, 1, 2);

    // Could include font max left/right bearings to either side of rectangle.

    int h = height();
    switch (d->vAlign) {
    case AlignTop:
        break;
    case AlignBottom:
        rect.moveTop(h - rect.height());
        break;
    case AlignVCenter:
        rect.moveTop((h - rect.height()) / 2);
        break;
    }

    return QRectF(rect);
}

/*! \internal */
void QDeclarativeText::geometryChanged(const QRectF &newGeometry, const QRectF &oldGeometry)
{
    Q_D(QDeclarativeText);
    if ((!d->internalWidthUpdate && newGeometry.width() != oldGeometry.width())
            && (d->wrapMode != QDeclarativeText::NoWrap
                || d->elideMode != QDeclarativeText::ElideNone
                || d->hAlign != QDeclarativeText::AlignLeft)) {
        if ((d->singleline || d->maximumLineCountValid) && d->elideMode != QDeclarativeText::ElideNone && widthValid()) {
            // We need to re-elide
            d->updateLayout();
        } else {
            // We just need to re-layout
            d->updateSize();
        }
    }

    QDeclarativeItem::geometryChanged(newGeometry, oldGeometry);
}

/*!
    \qmlproperty real Text::paintedWidth

    Returns the width of the text, including width past the width
    which is covered due to insufficient wrapping if WrapMode is set.
*/
qreal QDeclarativeText::paintedWidth() const
{
    Q_D(const QDeclarativeText);
    return d->paintedSize.width();
}

/*!
    \qmlproperty real Text::paintedHeight

    Returns the height of the text, including height past the height
    which is covered due to there being more text than fits in the set height.
*/
qreal QDeclarativeText::paintedHeight() const
{
    Q_D(const QDeclarativeText);
    return d->paintedSize.height();
}

/*!
    \qmlproperty real Text::lineHeight
    \since QtQuick 1.1

    Sets the line height for the text.
    The value can be in pixels or a multiplier depending on lineHeightMode.

    The default value is a multiplier of 1.0.
    The line height must be a positive value.
*/
qreal QDeclarativeText::lineHeight() const
{
    Q_D(const QDeclarativeText);
    return d->lineHeight;
}

void QDeclarativeText::setLineHeight(qreal lineHeight)
{
    Q_D(QDeclarativeText);

    if ((d->lineHeight == lineHeight) || (lineHeight < 0.0))
        return;

    d->lineHeight = lineHeight;
    d->updateLayout();
    emit lineHeightChanged(lineHeight);
}

/*!
    \qmlproperty enumeration Text::lineHeightMode

    This property determines how the line height is specified.
    The possible values are:

    \list
    \o Text.ProportionalHeight (default) - this sets the spacing proportional to the
       line (as a multiplier). For example, set to 2 for double spacing.
    \o Text.FixedHeight - this sets the line height to a fixed line height (in pixels).
    \endlist
*/
QDeclarativeText::LineHeightMode QDeclarativeText::lineHeightMode() const
{
    Q_D(const QDeclarativeText);
    return d->lineHeightMode;
}

void QDeclarativeText::setLineHeightMode(LineHeightMode mode)
{
    Q_D(QDeclarativeText);
    if (mode == d->lineHeightMode)
        return;

    d->lineHeightMode = mode;
    d->updateLayout();

    emit lineHeightModeChanged(mode);
}

/*!
    Returns the number of resources (images) that are being loaded asynchronously.
*/
int QDeclarativeText::resourcesLoading() const
{
    Q_D(const QDeclarativeText);
    return d->doc ? d->doc->resourcesLoading() : 0;
}

/*! \internal */
void QDeclarativeText::paint(QPainter *p, const QStyleOptionGraphicsItem *, QWidget *)
{
    Q_D(QDeclarativeText);

    if (d->cacheAllTextAsImage || d->style != Normal) {
        d->checkImageCache();
        if (d->imageCache.isNull())
            return;

        QRect br = boundingRect().toRect();

        bool needClip = clip() && (d->imageCache.width() > width() ||
                                   d->imageCache.height() > height());

        if (needClip)
            p->drawPixmap(0, 0, width(), height(), d->imageCache, -br.x(), -br.y(), width(), height());
        else
            p->drawPixmap(br.x(), br.y(), d->imageCache);
    } else {
        QRectF bounds = boundingRect();

        bool needClip = clip() && (d->layedOutTextRect.width() > width() ||
                                   d->layedOutTextRect.height() > height());

        if (needClip) {
            p->save();
            p->setClipRect(0, 0, width(), height(), Qt::IntersectClip);
        }
        if (d->richText) {
            QAbstractTextDocumentLayout::PaintContext context;
            context.palette.setColor(QPalette::Text, d->color);
            p->translate(bounds.x(), bounds.y());
            d->doc->documentLayout()->draw(p, context);
            p->translate(-bounds.x(), -bounds.y());
        } else {
            d->drawTextLayout(p, QPointF(0, bounds.y()), false);
        }

        if (needClip) {
            p->restore();
        }
    }
}

/*! \internal */
void QDeclarativeText::componentComplete()
{
    Q_D(QDeclarativeText);
    QDeclarativeItem::componentComplete();
    if (d->updateOnComponentComplete) {
        d->updateOnComponentComplete = false;
        if (d->richText) {
            d->ensureDoc();
            d->doc->setText(d->text);
            d->rightToLeftText = d->doc->toPlainText().isRightToLeft();
        } else {
            d->rightToLeftText = d->text.isRightToLeft();
        }
        d->determineHorizontalAlignment();
        d->updateLayout();
    }
}

/*!  \internal */
void QDeclarativeText::mousePressEvent(QGraphicsSceneMouseEvent *event)
{
    Q_D(QDeclarativeText);

    if (!d->richText || !d->doc || d->doc->documentLayout()->anchorAt(event->pos()).isEmpty()) {
        event->setAccepted(false);
        d->activeLink.clear();
    } else {
        d->activeLink = d->doc->documentLayout()->anchorAt(event->pos());
    }

    // ### may malfunction if two of the same links are clicked & dragged onto each other)

    if (!event->isAccepted())
        QDeclarativeItem::mousePressEvent(event);

}

/*! \internal */
void QDeclarativeText::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
{
    Q_D(QDeclarativeText);

        // ### confirm the link, and send a signal out
    if (d->richText && d->doc && d->activeLink == d->doc->documentLayout()->anchorAt(event->pos()))
        emit linkActivated(d->activeLink);
    else
        event->setAccepted(false);

    if (!event->isAccepted())
        QDeclarativeItem::mouseReleaseEvent(event);
}

QT_END_NAMESPACE

#include "moc_qdeclarativetext.cpp"
#include <moc_qdeclarativetext_p.h>