qlabel.cpp

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#include "qpainter.h"
#include "qevent.h"
#include "qdrawutil.h"
#include "qapplication.h"
#if QT_CONFIG(abstractbutton)
#include "qabstractbutton.h"
#endif
#include "qstyle.h"
#include "qstyleoption.h"
#include <limits.h>
#include "qclipboard.h"
#include <qdebug.h>
#include <qurl.h>
#include "qlabel_p.h"
#include "private/qstylesheetstyle_p.h"
#include <qmath.h>
 
#if QT_CONFIG(accessibility)
#include <qaccessible.h>
#endif
 
QT_BEGIN_NAMESPACE
 
using namespace Qt::StringLiterals;
 
QLabelPrivate::QLabelPrivate()
    : QFramePrivate(),
      sh(),
      msh(),
      text(),
      pixmap(),
      scaledpixmap(),
      cachedimage(),
#ifndef QT_NO_PICTURE
      picture(),
#endif
#if QT_CONFIG(movie)
      movie(),
#endif
      control(nullptr),
      shortcutCursor(),
#ifndef QT_NO_CURSOR
      cursor(),
#endif
#ifndef QT_NO_SHORTCUT
      buddy(),
      shortcutId(0),
#endif
      textformat(Qt::AutoText),
      effectiveTextFormat(Qt::PlainText),
      textInteractionFlags(Qt::LinksAccessibleByMouse),
      sizePolicy(),
      margin(0),
      align(Qt::AlignLeft | Qt::AlignVCenter | Qt::TextExpandTabs),
      indent(-1),
      valid_hints(false),
      scaledcontents(false),
      textLayoutDirty(false),
      textDirty(false),
      isTextLabel(false),
      hasShortcut(/*???*/),
#ifndef QT_NO_CURSOR
      validCursor(false),
      onAnchor(false),
#endif
      openExternalLinks(false),
      resourceProvider(nullptr)
{
}
 
QLabelPrivate::~QLabelPrivate()
{
}
 
#ifndef QT_NO_PICTURE
QPicture QLabel::picture() const
{
    Q_D(const QLabel);
    if (d->picture)
        return *(d->picture);
    return QPicture();
}
#endif // QT_NO_PICTURE
 
 
QLabel::QLabel(QWidget *parent, Qt::WindowFlags f)
    : QFrame(*new QLabelPrivate(), parent, f)
{
    Q_D(QLabel);
    d->init();
}
 
QLabel::QLabel(const QString &text, QWidget *parent, Qt::WindowFlags f)
    : QLabel(parent, f)
{
    setText(text);
}
 
 
 
QLabel::~QLabel()
{
    Q_D(QLabel);
    d->clearContents();
}
 
void QLabelPrivate::init()
{
    Q_Q(QLabel);
 
    q->setSizePolicy(QSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred,
                                 QSizePolicy::Label));
    setLayoutItemMargins(QStyle::SE_LabelLayoutItem);
}
 
 
void QLabel::setText(const QString &text)
{
    Q_D(QLabel);
    if (d->text == text)
        return;
 
    QWidgetTextControl *oldControl = d->control;
    d->control = nullptr;
 
    d->clearContents();
    d->text = text;
    d->isTextLabel = true;
    d->textDirty = true;
    if (d->textformat == Qt::AutoText) {
        if (Qt::mightBeRichText(d->text))
            d->effectiveTextFormat = Qt::RichText;
        else
            d->effectiveTextFormat = Qt::PlainText;
    } else {
        d->effectiveTextFormat = d->textformat;
    }
 
    d->control = oldControl;
 
    if (d->needTextControl()) {
        d->ensureTextControl();
    } else {
        delete d->control;
        d->control = nullptr;
    }
 
    if (d->effectiveTextFormat != Qt::PlainText) {
        setMouseTracking(true);
    } else {
        // Note: mouse tracking not disabled intentionally
    }
 
#ifndef QT_NO_SHORTCUT
    if (d->buddy)
        d->updateShortcut();
#endif
 
    d->updateLabel();
 
#if QT_CONFIG(accessibility)
    if (accessibleName().isEmpty()) {
        QAccessibleEvent event(this, QAccessible::NameChanged);
        QAccessible::updateAccessibility(&event);
    }
#endif
}
 
QString QLabel::text() const
{
    Q_D(const QLabel);
    return d->text;
}
 
void QLabel::clear()
{
    Q_D(QLabel);
    d->clearContents();
    d->updateLabel();
}
 
void QLabel::setPixmap(const QPixmap &pixmap)
{
    Q_D(QLabel);
    if (!d->pixmap || d->pixmap->cacheKey() != pixmap.cacheKey()) {
        d->clearContents();
        d->pixmap = pixmap;
    }
 
    d->updateLabel();
}
 
QPixmap QLabel::pixmap() const
{
    Q_D(const QLabel);
    if (d->pixmap)
        return *(d->pixmap);
    return QPixmap();
}
 
#ifndef QT_NO_PICTURE
void QLabel::setPicture(const QPicture &picture)
{
    Q_D(QLabel);
    d->clearContents();
    d->picture = picture;
 
    d->updateLabel();
}
#endif // QT_NO_PICTURE
 
void QLabel::setNum(int num)
{
    QString str;
    str.setNum(num);
    setText(str);
}
 
void QLabel::setNum(double num)
{
    QString str;
    str.setNum(num);
    setText(str);
}
 
void QLabel::setAlignment(Qt::Alignment alignment)
{
    Q_D(QLabel);
    if (alignment == (d->align & (Qt::AlignVertical_Mask|Qt::AlignHorizontal_Mask)))
        return;
    d->align = (d->align & ~(Qt::AlignVertical_Mask|Qt::AlignHorizontal_Mask))
               | (alignment & (Qt::AlignVertical_Mask|Qt::AlignHorizontal_Mask));
 
    d->updateLabel();
}
 
 
Qt::Alignment QLabel::alignment() const
{
    Q_D(const QLabel);
    return QFlag(d->align & (Qt::AlignVertical_Mask|Qt::AlignHorizontal_Mask));
}
 
 
void QLabel::setWordWrap(bool on)
{
    Q_D(QLabel);
    if (on)
        d->align |= Qt::TextWordWrap;
    else
        d->align &= ~Qt::TextWordWrap;
 
    d->updateLabel();
}
 
bool QLabel::wordWrap() const
{
    Q_D(const QLabel);
    return d->align & Qt::TextWordWrap;
}
 
void QLabel::setIndent(int indent)
{
    Q_D(QLabel);
    d->indent = indent;
    d->updateLabel();
}
 
int QLabel::indent() const
{
    Q_D(const QLabel);
    return d->indent;
}
 
 
int QLabel::margin() const
{
    Q_D(const QLabel);
    return d->margin;
}
 
void QLabel::setMargin(int margin)
{
    Q_D(QLabel);
    if (d->margin == margin)
        return;
    d->margin = margin;
    d->updateLabel();
}
 
QSize QLabelPrivate::sizeForWidth(int w) const
{
    Q_Q(const QLabel);
    if (q->minimumWidth() > 0)
        w = qMax(w, q->minimumWidth());
    QSize contentsMargin(leftmargin + rightmargin, topmargin + bottommargin);
 
    QRect br;
 
    int hextra = 2 * margin;
    int vextra = hextra;
    QFontMetrics fm = q->fontMetrics();
 
    if (pixmap && !pixmap->isNull()) {
        br = pixmap->rect();
        br.setSize(pixmap->deviceIndependentSize().toSize());
#ifndef QT_NO_PICTURE
    } else if (picture && !picture->isNull()) {
        br = picture->boundingRect();
#endif
#if QT_CONFIG(movie)
    } else if (movie && !movie->currentPixmap().isNull()) {
        br = movie->currentPixmap().rect();
        br.setSize(movie->currentPixmap().deviceIndependentSize().toSize());
#endif
    } else if (isTextLabel) {
        int align = QStyle::visualAlignment(textDirection(), QFlag(this->align));
        // Add indentation
        int m = indent;
 
        if (m < 0 && q->frameWidth()) // no indent, but we do have a frame
            m = fm.horizontalAdvance(u'x') - margin*2;
        if (m > 0) {
            if ((align & Qt::AlignLeft) || (align & Qt::AlignRight))
                hextra += m;
            if ((align & Qt::AlignTop) || (align & Qt::AlignBottom))
                vextra += m;
        }
 
        if (control) {
            ensureTextLayouted();
            const qreal oldTextWidth = control->textWidth();
            // Calculate the length of document if w is the width
            if (align & Qt::TextWordWrap) {
                if (w >= 0) {
                    w = qMax(w-hextra-contentsMargin.width(), 0); // strip margin and indent
                    control->setTextWidth(w);
                } else {
                    control->adjustSize();
                }
            } else {
                control->setTextWidth(-1);
            }
 
            QSizeF controlSize = control->size();
            br = QRect(QPoint(0, 0), QSize(qCeil(controlSize.width()), qCeil(controlSize.height())));
 
            // restore state
            control->setTextWidth(oldTextWidth);
        } else {
            // Turn off center alignment in order to avoid rounding errors for centering,
            // since centering involves a division by 2. At the end, all we want is the size.
            int flags = align & ~(Qt::AlignVCenter | Qt::AlignHCenter);
            if (hasShortcut) {
                flags |= Qt::TextShowMnemonic;
                QStyleOption opt;
                opt.initFrom(q);
                if (!q->style()->styleHint(QStyle::SH_UnderlineShortcut, &opt, q))
                    flags |= Qt::TextHideMnemonic;
            }
 
            bool tryWidth = (w < 0) && (align & Qt::TextWordWrap);
            if (tryWidth)
                w = qMin(fm.averageCharWidth() * 80, q->maximumSize().width());
            else if (w < 0)
                w = 2000;
            w -= (hextra + contentsMargin.width());
            br = fm.boundingRect(0, 0, w ,2000, flags, text);
            if (tryWidth && br.height() < 4*fm.lineSpacing() && br.width() > w/2)
                br = fm.boundingRect(0, 0, w/2, 2000, flags, text);
            if (tryWidth && br.height() < 2*fm.lineSpacing() && br.width() > w/4)
                br = fm.boundingRect(0, 0, w/4, 2000, flags, text);
        }
    } else {
        br = QRect(QPoint(0, 0), QSize(fm.averageCharWidth(), fm.lineSpacing()));
    }
 
    const QSize contentsSize(br.width() + hextra, br.height() + vextra);
    return (contentsSize + contentsMargin).expandedTo(q->minimumSize());
}
 
 
int QLabel::heightForWidth(int w) const
{
    Q_D(const QLabel);
    if (d->isTextLabel)
        return d->sizeForWidth(w).height();
    return QWidget::heightForWidth(w);
}
 
bool QLabel::openExternalLinks() const
{
    Q_D(const QLabel);
    return d->openExternalLinks;
}
 
void QLabel::setOpenExternalLinks(bool open)
{
    Q_D(QLabel);
    d->openExternalLinks = open;
    if (d->control)
        d->control->setOpenExternalLinks(open);
}
 
void QLabel::setTextInteractionFlags(Qt::TextInteractionFlags flags)
{
    Q_D(QLabel);
    if (d->textInteractionFlags == flags)
        return;
    d->textInteractionFlags = flags;
    if (flags & Qt::LinksAccessibleByKeyboard)
        setFocusPolicy(Qt::StrongFocus);
    else if (flags & (Qt::TextSelectableByKeyboard | Qt::TextSelectableByMouse))
        setFocusPolicy(Qt::ClickFocus);
    else
        setFocusPolicy(Qt::NoFocus);
 
    if (d->needTextControl()) {
        d->ensureTextControl();
    } else {
        delete d->control;
        d->control = nullptr;
    }
 
    if (d->control)
        d->control->setTextInteractionFlags(d->textInteractionFlags);
}
 
Qt::TextInteractionFlags QLabel::textInteractionFlags() const
{
    Q_D(const QLabel);
    return d->textInteractionFlags;
}
 
void QLabel::setSelection(int start, int length)
{
    Q_D(QLabel);
    if (d->control) {
        d->ensureTextPopulated();
        QTextCursor cursor = d->control->textCursor();
        cursor.setPosition(start);
        cursor.setPosition(start + length, QTextCursor::KeepAnchor);
        d->control->setTextCursor(cursor);
    }
}
 
bool QLabel::hasSelectedText() const
{
    Q_D(const QLabel);
    if (d->control)
        return d->control->textCursor().hasSelection();
    return false;
}
 
QString QLabel::selectedText() const
{
    Q_D(const QLabel);
    if (d->control)
        return d->control->textCursor().selectedText();
    return QString();
}
 
int QLabel::selectionStart() const
{
    Q_D(const QLabel);
    if (d->control && d->control->textCursor().hasSelection())
        return d->control->textCursor().selectionStart();
    return -1;
}
 
QSize QLabel::sizeHint() const
{
    Q_D(const QLabel);
    if (!d->valid_hints)
        (void) QLabel::minimumSizeHint();
    return d->sh;
}
 
QSize QLabel::minimumSizeHint() const
{
    Q_D(const QLabel);
    if (d->valid_hints) {
        if (d->sizePolicy == sizePolicy())
            return d->msh;
    }
 
    ensurePolished();
    d->valid_hints = true;
    d->sh = d->sizeForWidth(-1); // wrap ? golden ratio : min doc size
    QSize msh(-1, -1);
 
    if (!d->isTextLabel) {
        msh = d->sh;
    } else {
        msh.rheight() = d->sizeForWidth(QWIDGETSIZE_MAX).height(); // height for one line
        msh.rwidth() = d->sizeForWidth(0).width(); // wrap ? size of biggest word : min doc size
        if (d->sh.height() < msh.height())
            msh.rheight() = d->sh.height();
    }
    d->msh = msh;
    d->sizePolicy = sizePolicy();
    return msh;
}
 
void QLabel::mousePressEvent(QMouseEvent *ev)
{
    Q_D(QLabel);
    d->sendControlEvent(ev);
}
 
void QLabel::mouseMoveEvent(QMouseEvent *ev)
{
    Q_D(QLabel);
    d->sendControlEvent(ev);
}
 
void QLabel::mouseReleaseEvent(QMouseEvent *ev)
{
    Q_D(QLabel);
    d->sendControlEvent(ev);
}
 
#ifndef QT_NO_CONTEXTMENU
void QLabel::contextMenuEvent(QContextMenuEvent *ev)
{
    Q_D(QLabel);
    if (!d->isTextLabel) {
        ev->ignore();
        return;
    }
    QMenu *menu = d->createStandardContextMenu(ev->pos());
    if (!menu) {
        ev->ignore();
        return;
    }
    ev->accept();
    menu->setAttribute(Qt::WA_DeleteOnClose);
    menu->popup(ev->globalPos());
}
#endif // QT_NO_CONTEXTMENU
 
void QLabel::focusInEvent(QFocusEvent *ev)
{
    Q_D(QLabel);
    if (d->isTextLabel) {
        d->ensureTextControl();
        d->sendControlEvent(ev);
    }
    QFrame::focusInEvent(ev);
}
 
void QLabel::focusOutEvent(QFocusEvent *ev)
{
    Q_D(QLabel);
    if (d->control) {
        d->sendControlEvent(ev);
        QTextCursor cursor = d->control->textCursor();
        Qt::FocusReason reason = ev->reason();
        if (reason != Qt::ActiveWindowFocusReason
            && reason != Qt::PopupFocusReason
            && cursor.hasSelection()) {
            cursor.clearSelection();
            d->control->setTextCursor(cursor);
        }
    }
 
    QFrame::focusOutEvent(ev);
}
 
bool QLabel::focusNextPrevChild(bool next)
{
    Q_D(QLabel);
    if (d->control && d->control->setFocusToNextOrPreviousAnchor(next))
        return true;
    return QFrame::focusNextPrevChild(next);
}
 
void QLabel::keyPressEvent(QKeyEvent *ev)
{
    Q_D(QLabel);
    d->sendControlEvent(ev);
}
 
bool QLabel::event(QEvent *e)
{
    Q_D(QLabel);
    QEvent::Type type = e->type();
 
#ifndef QT_NO_SHORTCUT
    if (type == QEvent::Shortcut) {
        QShortcutEvent *se = static_cast<QShortcutEvent *>(e);
        if (se->shortcutId() == d->shortcutId) {
            QWidget *w = d->buddy;
            if (!w)
                return QFrame::event(e);
            if (w->focusPolicy() != Qt::NoFocus)
                w->setFocus(Qt::ShortcutFocusReason);
#if QT_CONFIG(abstractbutton)
            QAbstractButton *button = qobject_cast<QAbstractButton *>(w);
            if (button && !se->isAmbiguous())
                button->animateClick();
            else
#endif
                window()->setAttribute(Qt::WA_KeyboardFocusChange);
            return true;
        }
    } else
#endif
    if (type == QEvent::Resize) {
        if (d->control)
            d->textLayoutDirty = true;
    } else if (e->type() == QEvent::StyleChange
#ifdef Q_OS_MAC
               || e->type() == QEvent::MacSizeChange
#endif
               ) {
        d->setLayoutItemMargins(QStyle::SE_LabelLayoutItem);
        d->updateLabel();
    } else if (type == QEvent::Polish) {
        if (d->needTextControl())
            d->ensureTextControl();
    }
 
    return QFrame::event(e);
}
 
void QLabel::paintEvent(QPaintEvent *)
{
    Q_D(QLabel);
    QStyle *style = QWidget::style();
    QPainter painter(this);
    drawFrame(&painter);
    QRect cr = contentsRect();
    cr.adjust(d->margin, d->margin, -d->margin, -d->margin);
    int align = QStyle::visualAlignment(d->isTextLabel ? d->textDirection()
                                                       : layoutDirection(), QFlag(d->align));
 
#if QT_CONFIG(movie)
    if (d->movie && !d->movie->currentPixmap().isNull()) {
        if (d->scaledcontents)
            style->drawItemPixmap(&painter, cr, align, d->movie->currentPixmap().scaled(cr.size()));
        else
            style->drawItemPixmap(&painter, cr, align, d->movie->currentPixmap());
    }
    else
#endif
    if (d->isTextLabel) {
        QRectF lr = d->layoutRect().toAlignedRect();
        QStyleOption opt;
        opt.initFrom(this);
#ifndef QT_NO_STYLE_STYLESHEET
        if (QStyleSheetStyle* cssStyle = qt_styleSheet(style))
            cssStyle->styleSheetPalette(this, &opt, &opt.palette);
#endif
        if (d->control) {
#ifndef QT_NO_SHORTCUT
            const bool underline = static_cast<bool>(style->styleHint(QStyle::SH_UnderlineShortcut,
                                                                      nullptr, this, nullptr));
            if (d->shortcutId != 0
                && underline != d->shortcutCursor.charFormat().fontUnderline()) {
                QTextCharFormat fmt;
                fmt.setFontUnderline(underline);
                d->shortcutCursor.mergeCharFormat(fmt);
            }
#endif
            d->ensureTextLayouted();
 
            QAbstractTextDocumentLayout::PaintContext context;
            // Adjust the palette
            context.palette = opt.palette;
 
            if (foregroundRole() != QPalette::Text && isEnabled())
                context.palette.setColor(QPalette::Text, context.palette.color(foregroundRole()));
 
            painter.save();
            painter.translate(lr.topLeft());
            painter.setClipRect(lr.translated(-lr.x(), -lr.y()));
            d->control->setPalette(context.palette);
            d->control->drawContents(&painter, QRectF(), this);
            painter.restore();
        } else {
            int flags = align | (d->textDirection() == Qt::LeftToRight ? Qt::TextForceLeftToRight
                                                                       : Qt::TextForceRightToLeft);
            if (d->hasShortcut) {
                flags |= Qt::TextShowMnemonic;
                if (!style->styleHint(QStyle::SH_UnderlineShortcut, &opt, this))
                    flags |= Qt::TextHideMnemonic;
            }
            style->drawItemText(&painter, lr.toRect(), flags, opt.palette, isEnabled(), d->text, foregroundRole());
        }
    } else
#ifndef QT_NO_PICTURE
    if (d->picture) {
        QRect br = d->picture->boundingRect();
        int rw = br.width();
        int rh = br.height();
        if (d->scaledcontents) {
            painter.save();
            painter.translate(cr.x(), cr.y());
            painter.scale((double)cr.width()/rw, (double)cr.height()/rh);
            painter.drawPicture(-br.x(), -br.y(), *d->picture);
            painter.restore();
        } else {
            int xo = 0;
            int yo = 0;
            if (align & Qt::AlignVCenter)
                yo = (cr.height()-rh)/2;
            else if (align & Qt::AlignBottom)
                yo = cr.height()-rh;
            if (align & Qt::AlignRight)
                xo = cr.width()-rw;
            else if (align & Qt::AlignHCenter)
                xo = (cr.width()-rw)/2;
            painter.drawPicture(cr.x()+xo-br.x(), cr.y()+yo-br.y(), *d->picture);
        }
    } else
#endif
    if (d->pixmap && !d->pixmap->isNull()) {
        QPixmap pix;
        const qreal dpr = devicePixelRatio();
        if (d->scaledcontents || dpr != d->pixmap->devicePixelRatio()) {
            QSize scaledSize = d->scaledcontents ? (cr.size() * dpr)
                               : (d->pixmap->size() * (dpr / d->pixmap->devicePixelRatio()));
            if (!d->scaledpixmap || d->scaledpixmap->size() != scaledSize) {
                if (!d->cachedimage)
                    d->cachedimage = d->pixmap->toImage();
                d->scaledpixmap.reset();
                QImage scaledImage =
                    d->cachedimage->scaled(scaledSize,
                                           Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
                d->scaledpixmap = QPixmap::fromImage(std::move(scaledImage));
                d->scaledpixmap->setDevicePixelRatio(dpr);
            }
            pix = *d->scaledpixmap;
        } else
            pix = *d->pixmap;
        QStyleOption opt;
        opt.initFrom(this);
        if (!isEnabled())
            pix = style->generatedIconPixmap(QIcon::Disabled, pix, &opt);
        style->drawItemPixmap(&painter, cr, align, pix);
    }
}
 
 
void QLabelPrivate::updateLabel()
{
    Q_Q(QLabel);
    valid_hints = false;
 
    if (isTextLabel) {
        QSizePolicy policy = q->sizePolicy();
        const bool wrap = align & Qt::TextWordWrap;
        policy.setHeightForWidth(wrap);
        if (policy != q->sizePolicy())  // ### should be replaced by WA_WState_OwnSizePolicy idiom
            q->setSizePolicy(policy);
        textLayoutDirty = true;
    }
    q->updateGeometry();
    q->update(q->contentsRect());
}
 
#ifndef QT_NO_SHORTCUT
void QLabel::setBuddy(QWidget *buddy)
{
    Q_D(QLabel);
 
    if (d->buddy)
        disconnect(d->buddy, SIGNAL(destroyed()), this, SLOT(_q_buddyDeleted()));
 
    d->buddy = buddy;
 
    if (buddy)
        connect(buddy, SIGNAL(destroyed()), this, SLOT(_q_buddyDeleted()));
 
    if (d->isTextLabel) {
        if (d->shortcutId)
            releaseShortcut(d->shortcutId);
        d->shortcutId = 0;
        d->textDirty = true;
        if (buddy)
            d->updateShortcut(); // grab new shortcut
        d->updateLabel();
    }
}
 
 
QWidget * QLabel::buddy() const
{
    Q_D(const QLabel);
    return d->buddy;
}
 
void QLabelPrivate::updateShortcut()
{
    Q_Q(QLabel);
    Q_ASSERT(shortcutId == 0);
    // Introduce an extra boolean to indicate the presence of a shortcut in the
    // text. We cannot use the shortcutId itself because on the mac mnemonics are
    // off by default, so QKeySequence::mnemonic always returns an empty sequence.
    // But then we do want to hide the ampersands, so we can't use shortcutId.
    hasShortcut = false;
 
    if (!text.contains(u'&'))
        return;
    hasShortcut = true;
    shortcutId = q->grabShortcut(QKeySequence::mnemonic(text));
}
 
 
void QLabelPrivate::_q_buddyDeleted()
{
    Q_Q(QLabel);
    q->setBuddy(nullptr);
}
 
#endif // QT_NO_SHORTCUT
 
#if QT_CONFIG(movie)
void QLabelPrivate::_q_movieUpdated(const QRect& rect)
{
    Q_Q(QLabel);
    if (movie && movie->isValid()) {
        QRect r;
        if (scaledcontents) {
            QRect cr = q->contentsRect();
            QRect pixmapRect(cr.topLeft(), movie->currentPixmap().size());
            if (pixmapRect.isEmpty())
                return;
            r.setRect(cr.left(), cr.top(),
                      (rect.width() * cr.width()) / pixmapRect.width(),
                      (rect.height() * cr.height()) / pixmapRect.height());
        } else {
            r = q->style()->itemPixmapRect(q->contentsRect(), align, movie->currentPixmap());
            r.translate(rect.x(), rect.y());
            r.setWidth(qMin(r.width(), rect.width()));
            r.setHeight(qMin(r.height(), rect.height()));
        }
        q->update(r);
    }
}
 
void QLabelPrivate::_q_movieResized(const QSize& size)
{
    Q_Q(QLabel);
    q->update(); //we need to refresh the whole background in case the new size is smaller
    valid_hints = false;
    _q_movieUpdated(QRect(QPoint(0,0), size));
    q->updateGeometry();
}
 
void QLabel::setMovie(QMovie *movie)
{
    Q_D(QLabel);
    d->clearContents();
 
    if (!movie)
        return;
 
    d->movie = movie;
    connect(movie, SIGNAL(resized(QSize)), this, SLOT(_q_movieResized(QSize)));
    connect(movie, SIGNAL(updated(QRect)), this, SLOT(_q_movieUpdated(QRect)));
 
    // Assume that if the movie is running,
    // resize/update signals will come soon enough
    if (movie->state() != QMovie::Running)
        d->updateLabel();
}
 
#endif // QT_CONFIG(movie)
 
void QLabelPrivate::clearContents()
{
    delete control;
    control = nullptr;
    isTextLabel = false;
    hasShortcut = false;
 
#ifndef QT_NO_PICTURE
    picture.reset();
#endif
    scaledpixmap.reset();
    cachedimage.reset();
    pixmap.reset();
 
    text.clear();
    Q_Q(QLabel);
#ifndef QT_NO_SHORTCUT
    if (shortcutId)
        q->releaseShortcut(shortcutId);
    shortcutId = 0;
#endif
#if QT_CONFIG(movie)
    if (movie) {
        QObject::disconnect(movie, SIGNAL(resized(QSize)), q, SLOT(_q_movieResized(QSize)));
        QObject::disconnect(movie, SIGNAL(updated(QRect)), q, SLOT(_q_movieUpdated(QRect)));
    }
    movie = nullptr;
#endif
#ifndef QT_NO_CURSOR
    if (onAnchor) {
        if (validCursor)
            q->setCursor(cursor);
        else
            q->unsetCursor();
    }
    validCursor = false;
    onAnchor = false;
#endif
}
 
 
#if QT_CONFIG(movie)
 
QMovie *QLabel::movie() const
{
    Q_D(const QLabel);
    return d->movie;
}
 
#endif  // QT_CONFIG(movie)
 
Qt::TextFormat QLabel::textFormat() const
{
    Q_D(const QLabel);
    return d->textformat;
}
 
void QLabel::setTextFormat(Qt::TextFormat format)
{
    Q_D(QLabel);
    if (format != d->textformat) {
        d->textformat = format;
        QString t = d->text;
        if (!t.isNull()) {
            d->text.clear();
            setText(t);
        }
    }
}
 
QTextDocument::ResourceProvider QLabel::resourceProvider() const
{
    Q_D(const QLabel);
    return d->control ? d->control->document()->resourceProvider() : d->resourceProvider;
}
 
void QLabel::setResourceProvider(const QTextDocument::ResourceProvider &provider)
{
    Q_D(QLabel);
    d->resourceProvider = provider;
    if (d->control != nullptr)
        d->control->document()->setResourceProvider(provider);
}
 
void QLabel::changeEvent(QEvent *ev)
{
    Q_D(QLabel);
    if (ev->type() == QEvent::FontChange || ev->type() == QEvent::ApplicationFontChange) {
        if (d->isTextLabel) {
            if (d->control)
                d->control->document()->setDefaultFont(font());
            d->updateLabel();
        }
    } else if (ev->type() == QEvent::PaletteChange && d->control) {
        d->control->setPalette(palette());
    } else if (ev->type() == QEvent::ContentsRectChange) {
        d->updateLabel();
    }
    QFrame::changeEvent(ev);
}
 
bool QLabel::hasScaledContents() const
{
    Q_D(const QLabel);
    return d->scaledcontents;
}
 
void QLabel::setScaledContents(bool enable)
{
    Q_D(QLabel);
    if ((bool)d->scaledcontents == enable)
        return;
    d->scaledcontents = enable;
    if (!enable) {
        d->scaledpixmap.reset();
        d->cachedimage.reset();
    }
    update(contentsRect());
}
 
Qt::LayoutDirection QLabelPrivate::textDirection() const
{
    if (control) {
        QTextOption opt = control->document()->defaultTextOption();
        return opt.textDirection();
    }
 
    return text.isRightToLeft() ? Qt::RightToLeft : Qt::LeftToRight;
}
 
 
// Returns the rect that is available for us to draw the document
QRect QLabelPrivate::documentRect() const
{
    Q_Q(const QLabel);
    Q_ASSERT_X(isTextLabel, "documentRect", "document rect called for label that is not a text label!");
    QRect cr = q->contentsRect();
    cr.adjust(margin, margin, -margin, -margin);
    const int align = QStyle::visualAlignment(isTextLabel ? textDirection()
                                                          : q->layoutDirection(), QFlag(this->align));
    int m = indent;
    if (m < 0 && q->frameWidth()) // no indent, but we do have a frame
        m = q->fontMetrics().horizontalAdvance(u'x') / 2 - margin;
    if (m > 0) {
        if (align & Qt::AlignLeft)
            cr.setLeft(cr.left() + m);
        if (align & Qt::AlignRight)
            cr.setRight(cr.right() - m);
        if (align & Qt::AlignTop)
            cr.setTop(cr.top() + m);
        if (align & Qt::AlignBottom)
            cr.setBottom(cr.bottom() - m);
    }
    return cr;
}
 
void QLabelPrivate::ensureTextPopulated() const
{
    if (!textDirty)
        return;
    if (control) {
        QTextDocument *doc = control->document();
        if (textDirty) {
            if (effectiveTextFormat == Qt::PlainText) {
                doc->setPlainText(text);
#if QT_CONFIG(texthtmlparser)
            } else if (effectiveTextFormat == Qt::RichText) {
                doc->setHtml(text);
#endif
#if QT_CONFIG(textmarkdownreader)
            } else if (effectiveTextFormat == Qt::MarkdownText) {
                doc->setMarkdown(text);
#endif
            } else {
                doc->setPlainText(text);
            }
            doc->setUndoRedoEnabled(false);
 
#ifndef QT_NO_SHORTCUT
            if (hasShortcut) {
                // Underline the first character that follows an ampersand (and remove the others ampersands)
                int from = 0;
                bool found = false;
                QTextCursor cursor;
                while (!(cursor = control->document()->find(("&"_L1), from)).isNull()) {
                    cursor.deleteChar(); // remove the ampersand
                    cursor.movePosition(QTextCursor::NextCharacter, QTextCursor::KeepAnchor);
                    from = cursor.position();
                    if (!found && cursor.selectedText() != "&"_L1) { //not a second &
                        found = true;
                        shortcutCursor = cursor;
                    }
                }
            }
#endif
        }
    }
    textDirty = false;
}
 
void QLabelPrivate::ensureTextLayouted() const
{
    if (!textLayoutDirty)
        return;
    ensureTextPopulated();
    if (control) {
        QTextDocument *doc = control->document();
        QTextOption opt = doc->defaultTextOption();
 
        opt.setAlignment(QFlag(this->align));
 
        if (this->align & Qt::TextWordWrap)
            opt.setWrapMode(QTextOption::WordWrap);
        else
            opt.setWrapMode(QTextOption::ManualWrap);
 
        doc->setDefaultTextOption(opt);
 
        QTextFrameFormat fmt = doc->rootFrame()->frameFormat();
        fmt.setMargin(0);
        doc->rootFrame()->setFrameFormat(fmt);
        doc->setTextWidth(documentRect().width());
    }
    textLayoutDirty = false;
}
 
void QLabelPrivate::ensureTextControl() const
{
    Q_Q(const QLabel);
    if (!isTextLabel)
        return;
    if (!control) {
        control = new QWidgetTextControl(const_cast<QLabel *>(q));
        control->document()->setUndoRedoEnabled(false);
        control->document()->setDefaultFont(q->font());
        if (resourceProvider != nullptr)
            control->document()->setResourceProvider(resourceProvider);
        control->setTextInteractionFlags(textInteractionFlags);
        control->setOpenExternalLinks(openExternalLinks);
        control->setPalette(q->palette());
        control->setFocus(q->hasFocus());
        QObject::connect(control, SIGNAL(updateRequest(QRectF)),
                         q, SLOT(update()));
        QObject::connect(control, SIGNAL(linkHovered(QString)),
                         q, SLOT(_q_linkHovered(QString)));
        QObject::connect(control, SIGNAL(linkActivated(QString)),
                         q, SIGNAL(linkActivated(QString)));
        textLayoutDirty = true;
        textDirty = true;
    }
}
 
void QLabelPrivate::sendControlEvent(QEvent *e)
{
    Q_Q(QLabel);
    if (!isTextLabel || !control || textInteractionFlags == Qt::NoTextInteraction) {
        e->ignore();
        return;
    }
    control->processEvent(e, -layoutRect().topLeft(), q);
}
 
void QLabelPrivate::_q_linkHovered(const QString &anchor)
{
    Q_Q(QLabel);
#ifndef QT_NO_CURSOR
    if (anchor.isEmpty()) { // restore cursor
        if (validCursor)
            q->setCursor(cursor);
        else
            q->unsetCursor();
        onAnchor = false;
    } else if (!onAnchor) {
        validCursor = q->testAttribute(Qt::WA_SetCursor);
        if (validCursor) {
            cursor = q->cursor();
        }
        q->setCursor(Qt::PointingHandCursor);
        onAnchor = true;
    }
#endif
    emit q->linkHovered(anchor);
}
 
// Return the layout rect - this is the rect that is given to the layout painting code
// This may be different from the document rect since vertical alignment is not
// done by the text layout code
QRectF QLabelPrivate::layoutRect() const
{
    QRectF cr = documentRect();
    if (!control)
        return cr;
    ensureTextLayouted();
    // Calculate y position manually
    qreal rh = control->document()->documentLayout()->documentSize().height();
    qreal yo = 0;
    if (align & Qt::AlignVCenter)
        yo = qMax((cr.height()-rh)/2, qreal(0));
    else if (align & Qt::AlignBottom)
        yo = qMax(cr.height()-rh, qreal(0));
    return QRectF(cr.x(), yo + cr.y(), cr.width(), cr.height());
}
 
// Returns the point in the document rect adjusted with p
QPoint QLabelPrivate::layoutPoint(const QPoint& p) const
{
    QRect lr = layoutRect().toRect();
    return p - lr.topLeft();
}
 
#ifndef QT_NO_CONTEXTMENU
QMenu *QLabelPrivate::createStandardContextMenu(const QPoint &pos)
{
    if (!control)
        return nullptr;
 
    const QPoint p = layoutPoint(pos);
    return control->createStandardContextMenu(p, q_func());
}
#endif
 
QT_END_NAMESPACE
 
#include "moc_qlabel.cpp"