font_selection_widget.h

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#ifndef FONT_SELECTION_WIDGET_H
#define FONT_SELECTION_WIDGET_H
 
#include <QFont>
#include <QString>
#include <QWidget>
 
namespace Ui {
class FontSelectionWidget;
}

class FontSelectionWidget : public QWidget
{
    Q_OBJECT
 
public:
    enum class FamilyFilter {
        AllFamilies,    
        FixedPitchOnly  
    };

    enum class FontClass {
        Regular,    
        Monospace   
    };

    enum Feature {
        StyleFeature = 0x1,         
        EffectsFeature = 0x2,       
        FamilyFilterFeature = 0x4   
    };
    Q_DECLARE_FLAGS(Features, Feature)
 
    
    struct Selection {
        QString family;       
        qreal pointSize = 0;  

        bool operator==(const Selection &other) const;
        bool operator!=(const Selection &other) const { return !(*this == other); }
    };

    explicit FontSelectionWidget(QWidget *parent = nullptr);

    ~FontSelectionWidget();

    void setFamilyFilter(FamilyFilter filter);

    FamilyFilter familyFilter() const;

    void setFontClass(FontClass fontClass);

    FontClass fontClass() const;

    void setFeatures(Features features);

    Features features() const;

    void setDefaultAllowed(bool allowed);

    bool defaultAllowed() const;

    void setSelection(const Selection &sel);

    Selection selection() const;

    void setSelectedFont(const QFont &font);

    QFont selectedFont() const;

    QFont resolvedFont() const;

    void setSampleText(const QString &text);
 
signals:
    void changed();
 
protected:
    void showEvent(QShowEvent *event) override;
 
private:
    QString lookupFamily() const;
    void fillFamilyList();
    void applyFamilyTextFilter();
    void fillStyleList();
    void fillSizeList();
    void updateSizeSpin();
    void selectSizeRow();
    void updateEffects();
    void resetTo(const QFont &font, const Selection &sel);
    void refreshAll();
    void refreshSample();
    void familySelectionChanged();
    void monospaceToggled(bool checked);
    void styleSelectionChanged();
    void sizeSelectionChanged();
    void sizeValueChanged(double value);
    void strikeOutToggled(bool checked);
    void underlineToggled(bool checked);
 
    Ui::FontSelectionWidget *ui;
    QFont base_;
    Selection sel_;
    QString style_;
    bool strikeOut_ = false;
    bool underline_ = false;
    bool familyEdited_ = false;
    bool styleEdited_ = false;
    bool sizeEdited_ = false;
    bool strikeOutEdited_ = false;
    bool underlineEdited_ = false;
    FamilyFilter filter_ = FamilyFilter::AllFamilies;
    FontClass fontClass_ = FontClass::Regular;
    Features features_ = Features(StyleFeature | EffectsFeature | FamilyFilterFeature);
    bool defaultAllowed_ = false;
    int filledGeneration_ = -1;
    QString sampleText_;
};
 
Q_DECLARE_OPERATORS_FOR_FLAGS(FontSelectionWidget::Features)
 
#endif // FONT_SELECTION_WIDGET_H