auto_scaling_attachment.h

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#ifndef AUTO_SCALING_ATTACHMENT_H
#define AUTO_SCALING_ATTACHMENT_H
 
#include <QWidget>
 
class QLabel;

class AutoScalingAttachment final : public QWidget {
    Q_OBJECT
 
public:
    explicit AutoScalingAttachment(QWidget *content, QWidget *parent = nullptr);

    void SetMaxAllowedSize(const QSize &max_size);

    QSize ContentOriginalSize() const;

    bool IsScaled() const {
        return is_scaled_;
    }

    QWidget *Content() const {
        return content_;
    }

    QSize sizeHint() const override;
 
signals:
    void clicked();
 
protected:
    bool eventFilter(QObject *watched, QEvent *event) override;

    void enterEvent(QEvent *event) override;

    void leaveEvent(QEvent *event) override;

    void resizeEvent(QResizeEvent *event) override;
 
private slots:
    void CheckAndScaleContent();
 
private:
    void UpdateInfoLabelPosition() const;

    QWidget *content_;
    QWidget *content_container_;
    QLabel *info_label_;
    bool is_scaled_;
    QSize scaled_size_;
    QSize max_allowed_size_;
};
 
#endif // AUTO_SCALING_ATTACHMENT_H