qsettingsdialogwidget.h

#ifndef QSETTINGSDIALOGWIDGET_H
#define QSETTINGSDIALOGWIDGET_H

#include "qsettingsdialog_global.h"
#include "qsettingswidget.h"
#include <QWidget>
#include <QDialog>
#include <QIcon>
class QPushButton;

class QSETTINGSDIALOGSHARED_EXPORT QSettingsDialogWidgetBase : public QSettingsWidget<QWidget>
{
public:
    QSettingsDialogWidgetBase(QWidget *parent = nullptr);

    virtual QString buttonText() const = 0;
    virtual QIcon buttonIcon() const;
    virtual void showDialog() = 0;

protected:
    void showEvent(QShowEvent *event) final;

    static void wrapInDialog(QDialog *dialog, QWidget *element, bool fixedSize = false);

private:
    QPushButton *btn;
};

template<typename TSettingsWidget>
class QSettingsDialogWidget : public QSettingsDialogWidgetBase
{
public:
    QSettingsDialogWidget(QWidget *parent = nullptr) :
        QSettingsDialogWidgetBase(parent),
        dialog(nullptr),
        widget(new TSettingsWidget(this))
    {
        if(this->widget->inherits("QDialog"))
            this->dialog = (QDialog*)this->widget;
        else {
            this->dialog = new QDialog(this);
            wrapInDialog(this->dialog, this->widget);
        }
    }

    // QSettingsWidgetBase interface
    bool hasValueChanged() const final {
        return this->widget->hasValueChanged();
    }
    void resetValueChanged() final {
        this->widget->resetValueChanged();
    }
    void setValue(const QVariant &value) final {
        this->widget->setValue(value);
    }
    QVariant getValue() const final {
        return this->widget->getValue();
    }
    void resetValue() final {
        this->widget->resetValue();
    }
    bool searchExpression(const QRegularExpression &regex) final {
        return this->widget->searchExpression(regex);
    }

    // QSettingsDialogWidgetBase interface
    QString buttonText() const override {
        return this->widget->windowTitle();
    }
    QIcon buttonIcon() const override {
        return this->widget->windowIcon();
    }
    void showDialog() final {
        this->dialog->open();
    }

private:
    QDialog *dialog;
    TSettingsWidget *widget;
};

#endif // QSETTINGSDIALOGWIDGET_H