Long live Qt 4.5!

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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtGui 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 either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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 1.0, 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.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qfontcombobox.h"
+
+#ifndef QT_NO_FONTCOMBOBOX
+
+#include <qstringlistmodel.h>
+#include <qitemdelegate.h>
+#include <qlistview.h>
+#include <qpainter.h>
+#include <qevent.h>
+#include <qapplication.h>
+#include <private/qcombobox_p.h>
+#include <qdebug.h>
+
+QT_BEGIN_NAMESPACE
+
+static QFontDatabase::WritingSystem writingSystemForFont(const QFont &font, bool *hasLatin)
+{
+    *hasLatin = true;
+
+    QList<QFontDatabase::WritingSystem> writingSystems = QFontDatabase().writingSystems(font.family());
+//     qDebug() << font.family() << writingSystems;
+
+    // this just confuses the algorithm below. Vietnamese is Latin with lots of special chars
+    writingSystems.removeAll(QFontDatabase::Vietnamese);
+
+    QFontDatabase::WritingSystem system = QFontDatabase::Any;
+
+    if (!writingSystems.contains(QFontDatabase::Latin)) {
+        *hasLatin = false;
+        // we need to show something
+        if (writingSystems.count())
+            system = writingSystems.last();
+    } else {
+        writingSystems.removeAll(QFontDatabase::Latin);
+    }
+
+    if (writingSystems.isEmpty())
+        return system;
+
+    if (writingSystems.count() == 1 && writingSystems.at(0) > QFontDatabase::Cyrillic) {
+        system = writingSystems.at(0);
+        return system;
+    }
+
+    if (writingSystems.count() <= 2
+        && writingSystems.last() > QFontDatabase::Armenian
+        && writingSystems.last() < QFontDatabase::Vietnamese) {
+        system = writingSystems.last();
+        return system;
+    }
+
+    if (writingSystems.count() <= 5
+        && writingSystems.last() >= QFontDatabase::SimplifiedChinese
+        && writingSystems.last() <= QFontDatabase::Korean)
+        system = writingSystems.last();
+
+    return system;
+}
+
+class QFontFamilyDelegate : public QAbstractItemDelegate
+{
+    Q_OBJECT
+public:
+    explicit QFontFamilyDelegate(QObject *parent);
+
+    // painting
+    void paint(QPainter *painter,
+               const QStyleOptionViewItem &option,
+               const QModelIndex &index) const;
+
+    QSize sizeHint(const QStyleOptionViewItem &option,
+                   const QModelIndex &index) const;
+
+    QIcon truetype;
+    QIcon bitmap;
+    QFontDatabase::WritingSystem writingSystem;
+};
+
+QFontFamilyDelegate::QFontFamilyDelegate(QObject *parent)
+    : QAbstractItemDelegate(parent)
+{
+    truetype = QIcon(QLatin1String(":/trolltech/styles/commonstyle/images/fonttruetype-16.png"));
+    bitmap = QIcon(QLatin1String(":/trolltech/styles/commonstyle/images/fontbitmap-16.png"));
+    writingSystem = QFontDatabase::Any;
+}
+
+void QFontFamilyDelegate::paint(QPainter *painter,
+                                const QStyleOptionViewItem &option,
+                                const QModelIndex &index) const
+{
+    QString text = index.data(Qt::DisplayRole).toString();
+    QFont font(option.font);
+    font.setPointSize(QFontInfo(font).pointSize() * 3 / 2);
+    QFont font2 = font;
+    font2.setFamily(text);
+
+    bool hasLatin;
+    QFontDatabase::WritingSystem system = writingSystemForFont(font2, &hasLatin);
+    if (hasLatin)
+        font = font2;
+
+    QRect r = option.rect;
+
+    if (option.state & QStyle::State_Selected) {
+        painter->save();
+        painter->setBrush(option.palette.highlight());
+        painter->setPen(Qt::NoPen);
+        painter->drawRect(option.rect);
+        painter->setPen(QPen(option.palette.highlightedText(), 0));
+    }
+
+    const QIcon *icon = &bitmap;
+    if (QFontDatabase().isSmoothlyScalable(text)) {
+        icon = &truetype;
+    }
+    QSize actualSize = icon->actualSize(r.size());
+
+    icon->paint(painter, r, Qt::AlignLeft|Qt::AlignVCenter);
+    if (option.direction == Qt::RightToLeft)
+        r.setRight(r.right() - actualSize.width() - 4);
+    else
+        r.setLeft(r.left() + actualSize.width() + 4);
+
+    QFont old = painter->font();
+    painter->setFont(font);
+    painter->drawText(r, Qt::AlignVCenter|Qt::AlignLeading|Qt::TextSingleLine, text);
+
+    if (writingSystem != QFontDatabase::Any)
+        system = writingSystem;
+
+    if (system != QFontDatabase::Any) {
+        int w = painter->fontMetrics().width(text + QLatin1String("  "));
+        painter->setFont(font2);
+        QString sample = QFontDatabase().writingSystemSample(system);
+        if (option.direction == Qt::RightToLeft)
+            r.setRight(r.right() - w);
+        else
+            r.setLeft(r.left() + w);
+        painter->drawText(r, Qt::AlignVCenter|Qt::AlignLeading|Qt::TextSingleLine, sample);
+    }
+    painter->setFont(old);
+
+    if (option.state & QStyle::State_Selected)
+        painter->restore();
+
+}
+
+QSize QFontFamilyDelegate::sizeHint(const QStyleOptionViewItem &option,
+                                    const QModelIndex &index) const
+{
+    QString text = index.data(Qt::DisplayRole).toString();
+    QFont font(option.font);
+//     font.setFamily(text);
+    font.setPointSize(QFontInfo(font).pointSize() * 3/2);
+    QFontMetrics fontMetrics(font);
+    return QSize(fontMetrics.width(text), fontMetrics.lineSpacing());
+}
+
+
+class QFontComboBoxPrivate : public QComboBoxPrivate
+{
+public:
+    inline QFontComboBoxPrivate() { filters = QFontComboBox::AllFonts; }
+
+    QFontComboBox::FontFilters filters;
+    QFont currentFont;
+
+    void _q_updateModel();
+    void _q_currentChanged(const QString &);
+
+    Q_DECLARE_PUBLIC(QFontComboBox)
+};
+
+
+void QFontComboBoxPrivate::_q_updateModel()
+{
+    Q_Q(QFontComboBox);
+    const int scalableMask = (QFontComboBox::ScalableFonts | QFontComboBox::NonScalableFonts);
+    const int spacingMask = (QFontComboBox::ProportionalFonts | QFontComboBox::MonospacedFonts);
+
+    QStringListModel *m = qobject_cast<QStringListModel *>(q->model());
+    if (!m)
+        return;
+    QFontFamilyDelegate *delegate = qobject_cast<QFontFamilyDelegate *>(q->view()->itemDelegate());
+    QFontDatabase::WritingSystem system = delegate ? delegate->writingSystem : QFontDatabase::Any;
+
+    QFontDatabase fdb;
+    QStringList list = fdb.families(system);
+    QStringList result;
+
+    int offset = 0;
+    QFontInfo fi(currentFont);
+
+    for (int i = 0; i < list.size(); ++i) {
+        if ((filters & scalableMask) && (filters & scalableMask) != scalableMask) {
+            if (bool(filters & QFontComboBox::ScalableFonts) != fdb.isSmoothlyScalable(list.at(i)))
+                continue;
+        }
+        if ((filters & spacingMask) && (filters & spacingMask) != spacingMask) {
+            if (bool(filters & QFontComboBox::MonospacedFonts) != fdb.isFixedPitch(list.at(i)))
+                continue;
+        }
+        result += list.at(i);
+        if (list.at(i) == fi.family() || list.at(i).startsWith(fi.family() + QLatin1String(" [")))
+            offset = result.count() - 1;
+    }
+    list = result;
+
+    m->setStringList(list);
+    if (list.isEmpty()) {
+        if (currentFont != QFont()) {
+            currentFont = QFont();
+            emit q->currentFontChanged(currentFont);
+        }
+    } else {
+        q->setCurrentIndex(offset);
+    }
+}
+
+
+void QFontComboBoxPrivate::_q_currentChanged(const QString &text)
+{
+    Q_Q(QFontComboBox);
+    QFont newFont(text);
+    if (currentFont != newFont) {
+        currentFont = newFont;
+        emit q->currentFontChanged(currentFont);
+    }
+}
+
+/*!
+    \class QFontComboBox
+    \brief The QFontComboBox widget is a combobox that lets the user
+    select a font family.
+
+    \since 4.2
+    \ingroup basicwidgets
+    \ingroup text
+
+    The combobox is populated with an alphabetized list of font
+    family names, such as Arial, Helvetica, and Times New Roman.
+    Family names are displayed using the actual font when possible.
+    For fonts such as Symbol, where the name is not representable in
+    the font itself, a sample of the font is displayed next to the
+    family name.
+
+    QFontComboBox is often used in toolbars, in conjunction with a
+    QComboBox for controlling the font size and two \l{QToolButton}s
+    for bold and italic.
+
+    When the user selects a new font, the currentFontChanged() signal
+    is emitted in addition to currentIndexChanged().
+
+    Call setWritingSystem() to tell QFontComboBox to show only fonts
+    that support a given writing system, and setFontFilters() to
+    filter out certain types of fonts as e.g. non scalable fonts or
+    monospaced fonts.
+
+    \image windowsxp-fontcombobox.png Screenshot of QFontComboBox on Windows XP
+
+    \sa QComboBox, QFont, QFontInfo, QFontMetrics, QFontDatabase, {Character Map Example}
+*/
+
+/*!
+    \fn void QFontComboBox::setWritingSystem(QFontDatabase::WritingSystem script)
+*/
+
+/*!
+    \fn void QFontComboBox::setCurrentFont(const QFont &font);
+*/
+
+/*!
+    Constructs a font combobox with the given \a parent.
+*/
+QFontComboBox::QFontComboBox(QWidget *parent)
+    : QComboBox(*new QFontComboBoxPrivate, parent)
+{
+    Q_D(QFontComboBox);
+    d->currentFont = font();
+    setEditable(true);
+
+    QStringListModel *m = new QStringListModel(this);
+    setModel(m);
+    setItemDelegate(new QFontFamilyDelegate(this));
+    QListView *lview = qobject_cast<QListView*>(view());
+    if (lview)
+        lview->setUniformItemSizes(true);
+    setWritingSystem(QFontDatabase::Any);
+
+    connect(this, SIGNAL(currentIndexChanged(QString)),
+            this, SLOT(_q_currentChanged(QString)));
+
+    connect(qApp, SIGNAL(fontDatabaseChanged()),
+            this, SLOT(_q_updateModel()));
+}
+
+
+/*!
+    Destroys the combobox.
+*/
+QFontComboBox::~QFontComboBox()
+{
+}
+
+/*!
+    \property QFontComboBox::writingSystem
+    \brief the writing system that serves as a filter for the combobox
+
+    If \a script is QFontDatabase::Any (the default), all fonts are
+    listed.
+
+    \sa fontFilters
+*/
+
+void QFontComboBox::setWritingSystem(QFontDatabase::WritingSystem script)
+{
+    Q_D(QFontComboBox);
+    QFontFamilyDelegate *delegate = qobject_cast<QFontFamilyDelegate *>(view()->itemDelegate());
+    if (delegate)
+        delegate->writingSystem = script;
+    d->_q_updateModel();
+}
+
+QFontDatabase::WritingSystem QFontComboBox::writingSystem() const
+{
+    QFontFamilyDelegate *delegate = qobject_cast<QFontFamilyDelegate *>(view()->itemDelegate());
+    if (delegate)
+        return delegate->writingSystem;
+    return QFontDatabase::Any;
+}
+
+
+/*!
+  \enum QFontComboBox::FontFilter
+
+  This enum can be used to only show certain types of fonts in the font combo box.
+
+  \value AllFonts Show all fonts
+  \value ScalableFonts Show scalable fonts
+  \value NonScalableFonts Show non scalable fonts
+  \value MonospacedFonts Show monospaced fonts
+  \value ProportionalFonts Show proportional fonts
+*/
+
+/*!
+    \property QFontComboBox::fontFilters
+    \brief the filter for the combobox
+
+    By default, all fonts are listed.
+
+    \sa writingSystem
+*/
+void QFontComboBox::setFontFilters(FontFilters filters)
+{
+    Q_D(QFontComboBox);
+    d->filters = filters;
+    d->_q_updateModel();
+}
+
+QFontComboBox::FontFilters QFontComboBox::fontFilters() const
+{
+    Q_D(const QFontComboBox);
+    return d->filters;
+}
+
+/*!
+    \property QFontComboBox::currentFont
+    \brief the currently selected font
+
+    \sa currentFontChanged(), currentIndex, currentText
+*/
+QFont QFontComboBox::currentFont() const
+{
+    Q_D(const QFontComboBox);
+    return d->currentFont;
+}
+
+void QFontComboBox::setCurrentFont(const QFont &font)
+{
+    Q_D(QFontComboBox);
+    if (font != d->currentFont) {
+        d->currentFont = font;
+        emit currentFontChanged(d->currentFont);
+        d->_q_updateModel();
+    }
+}
+
+/*!
+    \fn QFontComboBox::currentFontChanged(const QFont &font)
+
+    This signal is emitted whenever the current font changes, with
+    the new \a font.
+
+    \sa currentFont
+*/
+
+/*!
+    \reimp
+*/
+bool QFontComboBox::event(QEvent *e)
+{
+    if (e->type() == QEvent::Resize) {
+        QListView *lview = qobject_cast<QListView*>(view());
+        if (lview)
+            lview->window()->setFixedWidth(width() * 5 / 3);
+    }
+    return QComboBox::event(e);
+}
+
+/*!
+    \reimp
+*/
+QSize QFontComboBox::sizeHint() const
+{
+    QSize sz = QComboBox::sizeHint();
+    QFontMetrics fm(font());
+    sz.setWidth(fm.width(QLatin1Char('m'))*14);
+    return sz;
+}
+
+QT_END_NAMESPACE
+
+#include "qfontcombobox.moc"
+#include "moc_qfontcombobox.cpp"
+
+#endif // QT_NO_FONTCOMBOBOX