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Diffstat (limited to 'src/declarative/graphicsitems/qdeclarativetext.cpp')
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diff --git a/src/declarative/graphicsitems/qdeclarativetext.cpp b/src/declarative/graphicsitems/qdeclarativetext.cpp new file mode 100644 index 0000000000..a38152d177 --- /dev/null +++ b/src/declarative/graphicsitems/qdeclarativetext.cpp @@ -0,0 +1,1640 @@ +/**************************************************************************** +** +** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the QtDeclarative module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** No Commercial Usage +** This file contains pre-release code and may not be distributed. +** You may use this file in accordance with the terms and conditions +** contained in the Technology Preview License Agreement accompanying +** this package. +** +** 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 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 2.1 requirements +** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain additional +** rights. These rights are described in the Nokia Qt LGPL Exception +** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** If you have questions regarding the use of this file, please contact +** Nokia at qt-info@nokia.com. +** +** +** +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "private/qdeclarativetext_p.h" +#include "private/qdeclarativetext_p_p.h" +#include <qdeclarativestyledtext_p.h> +#include <qdeclarativeinfo.h> +#include <qdeclarativepixmapcache_p.h> + +#include <QSet> +#include <QTextLayout> +#include <QTextLine> +#include <QTextDocument> +#include <QGraphicsSceneMouseEvent> +#include <QPainter> +#include <QAbstractTextDocumentLayout> +#include <qmath.h> +#include <limits.h> + +QT_BEGIN_NAMESPACE + +extern Q_GUI_EXPORT bool qt_applefontsmoothing_enabled; + +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 (wrapMode != QDeclarativeText::NoWrap && 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); +#ifdef Q_WS_MAC + bool oldSmooth = qt_applefontsmoothing_enabled; + qt_applefontsmoothing_enabled = false; +#endif + QPainter p(&img); +#ifdef Q_WS_MAC + qt_applefontsmoothing_enabled = oldSmooth; +#endif + 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); +#ifdef Q_WS_MAC + bool oldSmooth = qt_applefontsmoothing_enabled; + qt_applefontsmoothing_enabled = false; +#endif + QPainter p(&img); +#ifdef Q_WS_MAC + qt_applefontsmoothing_enabled = oldSmooth; +#endif + + 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 + \qmlproperty enumeration Text::effectiveHorizontalAlignment + + 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 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 read-only property \c effectiveHorizontalAlignment. +*/ +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) { + QDeclarativeText::HAlignment oldEffectiveHAlign = q->effectiveHAlign(); + hAlign = alignment; + + emit q->horizontalAlignmentChanged(hAlign); + if (oldEffectiveHAlign != q->effectiveHAlign()) + emit q->effectiveHorizontalAlignmentChanged(); + 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(); + emit q->effectiveHorizontalAlignmentChanged(); + } + } +} + +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 Quick 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 Quick 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 Quick 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> + > < & + \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 Quick 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; + + bool oldAA = p->testRenderHint(QPainter::Antialiasing); + bool oldSmooth = p->testRenderHint(QPainter::SmoothPixmapTransform); + if (d->smooth) + p->setRenderHints(QPainter::Antialiasing | QPainter::SmoothPixmapTransform, d->smooth); + + 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); + + if (d->smooth) { + p->setRenderHint(QPainter::Antialiasing, oldAA); + p->setRenderHint(QPainter::SmoothPixmapTransform, oldSmooth); + } + } 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 "qdeclarativetext.moc" |