code_app/app/scanner/dialog_export.h

#ifndef DIALOG_EXPORT_H
#define DIALOG_EXPORT_H

#include <QDialog>
#include <vector>

// u can ONLY comment following line if u want to use filedialog as system present !
#include "custom_file_dialog.h"

struct SupportType
{
public:
    SupportType(const QString &e, const QString &t, int a)
    {
        ext = e;
        title = t;
        attr = a;
    }

    QString ext;
    QString title;
    int     attr;
};

namespace Ui {
class Dialog_Export;
}


class Dialog_Export : public QDialog
#ifdef USE_FILE_DLG_WITHOUT_PROMPT
        , public custom_file_dlg<Dialog_Export>
#endif
{
    Q_OBJECT


public:
    explicit Dialog_Export(int total, const std::vector<int> &selectedIndexs, QWidget *parent = nullptr);
    ~Dialog_Export();

    QString getSavePath();
    QString getSaveName();
    QString getSaveExt();
    int getJpegQuality();
    int getTiffCompressionBW();
    int getTiffCompression();
    int getTiffQuality();
    bool isOcr();
    bool isSaveAsMultiPage();
    void getSaveIndexs(std::vector<int> &indexs);
    int getOcrLanguageType();

private slots:
    void on_dialog_accepted();
    void on_filterSelected(const QString& filterName);
    void on_btn_option_clicked();
    void on_radio_nominatedPages_toggled(bool checked);
    void on_lineEdit_nominatePages_textChanged(const QString& arg1);

#ifdef USE_FILE_DLG_WITHOUT_PROMPT
    void on_file_dialog_textChanged(const QString &path) override;
    void on_file_dialog_returnPressed() override;
#endif

private:
    bool isNominatedPagesLegal(const QString& page);
    void makeSaveIndexs();
    bool is_support_file_type(const QString& ext);      // ext is like as '.bmp' '.png' ...
    bool avoid_overwriting(const QString& path_file);   // 判断文件是否存在，若存在则提示用户是否覆盖。返回true表示用户希望重新选择

private:
    Ui::Dialog_Export *ui;
    std::vector<SupportType> m_supportType;
    int m_total;
    std::vector<int> m_selectedIndexs;

    QString m_savePath;
    QString m_saveName;
    QString m_saveExt;
    std::vector<int> m_saveIndexs;
    int m_suffix;
};

#endif // DIALOG_EXPORT_H