qfontdialog.cpp

奇趣公司比较新的qt/emd版本

    QFont font = QFontDialog::getFont(&ok, this);
    if (ok) {
        // font is set to the font the user selected
    } else {
        // the user canceled the dialog; font is set to the default
        // application font, QApplication::font()
    }
  \endcode

*/
QFont QFontDialog::getFont(bool *ok, QWidget *parent)
{
    return QFontDialogPrivate::getFont(ok, 0, parent);
}

QFont QFontDialogPrivate::getFont(bool *ok, const QFont *def, QWidget *parent,
                                  const QString &caption)
{
    QFont result;
    if (def)
        result = *def;

    QFontDialog *dlg = new QFontDialog(parent, true);

    dlg->setFont((def ? *def : QFont()));
    dlg->setWindowTitle(!caption.isEmpty() ? caption : QFontDialog::tr("Select Font"));

    bool res = (dlg->exec() == QDialog::Accepted);
    if (res)
        result = dlg->font();
    if (ok)
        *ok = res;
    delete dlg;
    return result;
}

/*!
  \internal
  ### Qt5 - remove me
*/
QFont QFontDialog::getFont(bool *ok, const QFont *def, QWidget* parent)
{
    return getFont(ok, *def, parent, QString());
}

/*!
    \internal
    An event filter to make the Up, Down, PageUp and PageDown keys work
    correctly in the line edits. The source of the event is the object
    \a o and the event is \a e.
*/

bool QFontDialog::eventFilter(QObject * o , QEvent * e)
{
    Q_D(QFontDialog);
    if (e->type() == QEvent::KeyPress) {
        QKeyEvent * k = (QKeyEvent *)e;
        if (o == d->sizeEdit &&
        (k->key() == Qt::Key_Up ||
             k->key() == Qt::Key_Down ||
         k->key() == Qt::Key_PageUp ||
         k->key() == Qt::Key_PageDown)) {

            int ci = d->sizeList->currentItem();
            (void)QApplication::sendEvent(d->sizeList, k);

            if (ci != d->sizeList->currentItem() &&
                style()->styleHint(QStyle::SH_FontDialog_SelectAssociatedText, 0, this))
                d->sizeEdit->selectAll();
            return true;
        } else if ((o == d->familyList || o == d->styleList) &&
                    (k->key() == Qt::Key_Return || k->key() == Qt::Key_Enter)) {
            k->accept();
        accept();
            return true;
        }
    } else if (e->type() == QEvent::FocusIn &&
                style()->styleHint(QStyle::SH_FontDialog_SelectAssociatedText, 0, this)) {
        if (o == d->familyList)
            d->familyEdit->selectAll();
        else if (o == d->styleList)
            d->styleEdit->selectAll();
        else if (o == d->sizeList)
            d->sizeEdit->selectAll();
    } else if (e->type() == QEvent::MouseButtonPress && o == d->sizeList) {
            d->sizeEdit->setFocus();
    }
    return QDialog::eventFilter(o, e);
}

/*!
  \internal
    Updates the contents of the "font family" list box. This
  function can be reimplemented if you have special requirements.
*/

void QFontDialog::updateFamilies()
{
    Q_D(QFontDialog);
    d->familyList->blockSignals(true);

    enum match_t { MATCH_NONE=0, MATCH_LAST_RESORT=1, MATCH_APP=2, MATCH_FALLBACK, MATCH_FAMILY=3 };

    QStringList familyNames = d->fdb.families(d->writingSystem);

    d->familyList->model()->setStringList(familyNames);

    QString foundryName1, familyName1, foundryName2, familyName2;
    int bestFamilyMatch = -1;
    match_t bestFamilyType = MATCH_NONE;

    QFont f;

    // ##### do the right thing for a list of family names in the font.
    QFontDatabase::parseFontName(d->family, foundryName1, familyName1);

    QStringList::Iterator it = familyNames.begin();
    int i = 0;
    for(; it != familyNames.end(); ++it, ++i) {

        QFontDatabase::parseFontName(*it, foundryName2, familyName2);

        //try to match..
        if (familyName1 == familyName2) {
            bestFamilyType = MATCH_FAMILY;
            if (foundryName1 == foundryName2) {
                bestFamilyMatch = i;
                break;
            }
            if (bestFamilyMatch < MATCH_FAMILY)
                bestFamilyMatch = i;
        }

        //and try some fall backs
        match_t type = MATCH_NONE;
        if (bestFamilyType <= MATCH_NONE && familyName2 == f.lastResortFamily())
            type = MATCH_LAST_RESORT;
        if (bestFamilyType <= MATCH_LAST_RESORT && familyName2 == f.family())
            type = MATCH_APP;
        // ### add fallback for writingSystem
        if (type != MATCH_NONE) {
            bestFamilyType = type;
            bestFamilyMatch = i;
        }
    }

    if (i != -1 && bestFamilyType != MATCH_NONE)
        d->familyList->setCurrentItem(bestFamilyMatch);
    else
        d->familyList->setCurrentItem(0);
    d->familyEdit->setText(d->familyList->currentText());
    if (style()->styleHint(QStyle::SH_FontDialog_SelectAssociatedText, 0, this) &&
        d->familyList->hasFocus())
        d->familyEdit->selectAll();

    d->familyList->blockSignals(false);
    updateStyles();
}

/*!
    \internal
    Updates the contents of the "font style" list box. This
  function can be reimplemented if you have special requirements.
*/

void QFontDialog::updateStyles()
{
    Q_D(QFontDialog);
    d->styleList->blockSignals(true);


    QStringList styles = d->fdb.styles(d->familyList->currentText());
    d->styleList->model()->setStringList(styles);

    if (styles.isEmpty()) {
        d->styleEdit->clear();
        d->smoothScalable = false;
    } else {
        if (!d->style.isEmpty()) {
            bool found = false;
            bool first = true;
            QString cstyle = d->style;
        redo:
            for ( int i = 0 ; i < (int)d->styleList->count() ; i++ ) {
                if ( cstyle == d->styleList->text(i) ) {
                     d->styleList->setCurrentItem( i );
                     found = true;
                     break;
                 }
            }
            if (!found && first) {
                if (cstyle.contains(QLatin1String("Italic"))) {
                    cstyle.replace(QLatin1String("Italic"), QLatin1String("Oblique"));
                    first = false;
                    goto redo;
                } else if (cstyle.contains(QLatin1String("Oblique"))) {
                    cstyle.replace(QLatin1String("Oblique"), QLatin1String("Italic"));
                    first = false;
                    goto redo;
                }
            }
            if (!found)
                d->styleList->setCurrentItem(0);
        }

        d->styleEdit->setText(d->styleList->currentText());
        if (style()->styleHint(QStyle::SH_FontDialog_SelectAssociatedText, 0, this) &&
            d->styleList->hasFocus())
            d->styleEdit->selectAll();

        d->smoothScalable = d->fdb.isSmoothlyScalable(d->familyList->currentText(), d->styleList->currentText());
    }

    d->styleList->blockSignals(false);

    updateSizes();
}

/*!
    \internal
    Updates the contents of the "font size" list box. This
  function can be reimplemented if you have special requirements.
*/

void QFontDialog::updateSizes()
{
    Q_D(QFontDialog);
    d->sizeList->blockSignals(true);

    if (!d->familyList->currentText().isEmpty()) {
        QList<int> sizes = d->fdb.pointSizes(d->familyList->currentText(), d->styleList->currentText());

        int i = 0;
        int current = -1;
        QStringList str_sizes;
        for(QList<int>::const_iterator it = sizes.constBegin() ; it != sizes.constEnd(); ++it) {
            str_sizes.append(QString::number(*it));
            if (current == -1 && *it >= d->size)
                current = i;
            ++i;
        }
        d->sizeList->model()->setStringList(str_sizes);
        if (current == -1)
            // we request a size bigger than the ones in the list, select the biggest one
            current = d->sizeList->count() - 1;
        d->sizeList->setCurrentItem(current);

        d->sizeEdit->blockSignals(true);
        d->sizeEdit->setText((d->smoothScalable ? QString::number(d->size) : d->sizeList->currentText()));
        if (style()->styleHint(QStyle::SH_FontDialog_SelectAssociatedText, 0, this) &&
             d->sizeList->hasFocus())
            d->sizeEdit->selectAll();
        d->sizeEdit->blockSignals(false);
    } else {
        d->sizeEdit->clear();
    }

    d->sizeList->blockSignals(false);
    d->_q_updateSample();
}

void QFontDialogPrivate::_q_updateSample()
{
    Q_Q(QFontDialog);
    if (familyList->currentText().isEmpty())
        sampleEdit->clear();
    else
        sampleEdit->setFont(q->font());
}

/*!
    \internal
*/
void QFontDialogPrivate::_q_writingSystemHighlighted(int index)
{
    Q_Q(QFontDialog);
    writingSystem = QFontDatabase::WritingSystem(index);
    sampleEdit->setText(fdb.writingSystemSample(writingSystem));
    q->updateFamilies();
}

/*!
    \internal
*/
void QFontDialogPrivate::_q_familyHighlighted(int i)
{
    Q_Q(QFontDialog);
    family = familyList->text(i);
    familyEdit->setText(family);
    if (q->style()->styleHint(QStyle::SH_FontDialog_SelectAssociatedText, 0, q) &&
         familyList->hasFocus())
        familyEdit->selectAll();

    q->updateStyles();
}


/*!
    \internal
*/

void QFontDialogPrivate::_q_styleHighlighted(int index)
{
    Q_Q(QFontDialog);
    QString s = styleList->text(index);
    styleEdit->setText(s);
    if (q->style()->styleHint(QStyle::SH_FontDialog_SelectAssociatedText, 0, q) &&
         styleList->hasFocus())
        styleEdit->selectAll();

    style = s;

    q->updateSizes();
}


/*!
    \internal
*/

void QFontDialogPrivate::_q_sizeHighlighted(int index)
{
    Q_Q(QFontDialog);
    QString s = sizeList->text(index);
    sizeEdit->setText(s);
    if (q->style()->styleHint(QStyle::SH_FontDialog_SelectAssociatedText, 0, q) &&
         sizeEdit->hasFocus())
        sizeEdit->selectAll();

    size = s.toInt();
    _q_updateSample();
}

/*!
    \internal
    This slot is called if the user changes the font size.
    The size is passed in the \a s argument as a \e string.
*/

void QFontDialogPrivate::_q_sizeChanged(const QString &s)
{
    // no need to check if the conversion is valid, since we have an QIntValidator in the size edit
    int size = s.toInt();
    if (this->size == size)
        return;

    this->size = size;
    if (sizeList->count() != 0) {
        int i;
        for (i = 0 ; i < sizeList->count() - 1 ; i++) {
            if (sizeList->text(i).toInt() >= this->size)
                break;
        }
        sizeList->blockSignals(true);
        sizeList->setCurrentItem(i);
        sizeList->blockSignals(false);
    }
    _q_updateSample();
}

void QFontDialogPrivate::retranslateStrings()
{
    familyAccel->setText(QFontDialog::tr("&Font"));
    styleAccel->setText(QFontDialog::tr("Font st&yle"));
    sizeAccel->setText(QFontDialog::tr("&Size"));
    effects->setTitle(QFontDialog::tr("Effects"));
    strikeout->setText(QFontDialog::tr("Stri&keout"));
    underline->setText(QFontDialog::tr("&Underline"));
    sample->setTitle(QFontDialog::tr("Sample"));
    writingSystemAccel->setText(QFontDialog::tr("Wr&iting System"));
}


/*!
    \reimp
*/
void QFontDialog::changeEvent(QEvent *e)
{
    Q_D(QFontDialog);
    if (e->type() == QEvent::LanguageChange) {
        d->retranslateStrings();
    }
    QDialog::changeEvent(e);
}

/*!
  \internal
  Sets the font highlighted in the QFontDialog to font \a f.

  \sa font()
*/

void QFontDialog::setFont(const QFont &f)
{
    Q_D(QFontDialog);
    d->family = f.family();
    d->style = d->fdb.styleString(f);
    d->size = f.pointSize();
    if (d->size == -1) {
            QFontInfo fi(f);
            d->size = fi.pointSize();
    }
    d->strikeout->setChecked(f.strikeOut());
    d->underline->setChecked(f.underline());

    updateFamilies();
}

/*!
  \internal
  Returns the font which the user has chosen.

  \sa setFont()
*/

QFont QFontDialog::font() const
{
    Q_D(const QFontDialog);
    int pSize = d->sizeEdit->text().toInt();

    QFont f = d->fdb.font(d->familyList->currentText(), d->style, pSize);
    f.setStrikeOut(d->strikeout->isChecked());
    f.setUnderline(d->underline->isChecked());
    return f;
}

/*!
    \fn QFont QFontDialog::getFont(bool *ok, const QFont &def, QWidget* parent, const char* name)

    Call getFont(\a ok, \a def, \a parent) instead.

    The \a name parameter is ignored.
*/

/*!
    \fn QFont QFontDialog::getFont(bool *ok, QWidget* parent, const char* name)

    Call getFont(\a ok, \a parent) instead.

    The \a name parameter is ignored.
*/

#include "qfontdialog.moc"
#include "moc_qfontdialog.cpp"

#endif