qfontcombobox.h

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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
 
#ifndef QFONTCOMBOBOX_H
#define QFONTCOMBOBOX_H
 
#include <QtWidgets/qtwidgetsglobal.h>
#include <QtWidgets/qcombobox.h>
#include <QtGui/qfontdatabase.h>
 
QT_REQUIRE_CONFIG(fontcombobox);
 
QT_BEGIN_NAMESPACE
 
class QFontComboBoxPrivate;
 
class Q_WIDGETS_EXPORT QFontComboBox : public QComboBox
{
    Q_OBJECT
    Q_PROPERTY(QFontDatabase::WritingSystem writingSystem READ writingSystem WRITE setWritingSystem)
    Q_PROPERTY(FontFilters fontFilters READ fontFilters WRITE setFontFilters)
    Q_PROPERTY(QFont currentFont READ currentFont WRITE setCurrentFont NOTIFY currentFontChanged)
 
public:
    explicit QFontComboBox(QWidget *parent = nullptr);
    ~QFontComboBox();
 
    void setWritingSystem(QFontDatabase::WritingSystem);
    QFontDatabase::WritingSystem writingSystem() const;
 
    enum FontFilter {
        AllFonts = 0,
        ScalableFonts = 0x1,
        NonScalableFonts = 0x2,
        MonospacedFonts = 0x4,
        ProportionalFonts = 0x8
    };
    Q_DECLARE_FLAGS(FontFilters, FontFilter)
    Q_FLAG(FontFilters)
 
    void setFontFilters(FontFilters filters);
    FontFilters fontFilters() const;
 
    QFont currentFont() const;
    QSize sizeHint() const override;
 
    void setSampleTextForSystem(QFontDatabase::WritingSystem writingSystem, const QString &sampleText);
    QString sampleTextForSystem(QFontDatabase::WritingSystem writingSystem) const;
 
    void setSampleTextForFont(const QString &fontFamily, const QString &sampleText);
    QString sampleTextForFont(const QString &fontFamily) const;
 
    void setDisplayFont(const QString &fontFamily, const QFont &font);
    std::optional<QFont> displayFont(const QString &fontFamily) const;
 
public Q_SLOTS:
    void setCurrentFont(const QFont &f);
 
Q_SIGNALS:
    void currentFontChanged(const QFont &f);
 
protected:
    bool event(QEvent *e) override;
 
private:
    Q_DISABLE_COPY(QFontComboBox)
    Q_DECLARE_PRIVATE(QFontComboBox)
};
 
Q_DECLARE_OPERATORS_FOR_FLAGS(QFontComboBox::FontFilters)
 
QT_END_NAMESPACE
 
#endif