src_gui_dialogs_qfiledialog.cpp

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
#include <QFileDialog>
#include <QWidget>
 
 
class FileDialogExample : public QWidget
{
    Q_OBJECT
public:
    FileDialogExample();
};
 
FileDialogExample::FileDialogExample()
{
    QString fileName;
    QFileDialog dialog(this);
    {
        //! [0]
        fileName = QFileDialog::getOpenFileName(this,
            tr("Open Image"), "/home/jana", tr("Image Files (*.png *.jpg *.bmp)"));
        //! [0]
    }
 
    {
        //! [1]
        QFileDialog dialog(this);
        dialog.setNameFilter(tr("Images (*.png *.xpm *.jpg);;Text files (*.txt);;XML files (*.xml)"));
        dialog.exec();
        //! [1]
    }
 
    {
        //! [2]
        QFileDialog dialog(this);
        dialog.setFileMode(QFileDialog::AnyFile);
        //! [2]
    }
 
    {
        //! [3]
        dialog.setNameFilter(tr("Images (*.png *.xpm *.jpg)"));
        //! [3]
    }
 
    {
        //! [4]
        dialog.setViewMode(QFileDialog::Detail);
        //! [4]
    }
 
    {
        //! [5]
        QStringList fileNames;
        if (dialog.exec())
            fileNames = dialog.selectedFiles();
        //! [5]
    }
 
    {
        //! [6]
        dialog.setNameFilter("All C++ files (*.cpp *.cc *.C *.cxx *.c++)");
        dialog.setNameFilter("*.cpp *.cc *.C *.cxx *.c++");
        //! [6]
    }
 
    {
        //! [7]
        const QStringList filters({"Image files (*.png *.xpm *.jpg)",
                                   "Text files (*.txt)",
                                   "Any files (*)"
                                  });
        QFileDialog dialog(this);
        dialog.setNameFilters(filters);
        dialog.exec();
        //! [7]
    }
 
    {
        //! [8]
        QString fileName = QFileDialog::getOpenFileName(this, tr("Open File"),
                                                        "/home",
                                                        tr("Images (*.png *.xpm *.jpg)"));
        //! [8]
    }
 
    {
        //! [9]
        QStringList files = QFileDialog::getOpenFileNames(
                                this,
                                "Select one or more files to open",
                                "/home",
                                "Images (*.png *.xpm *.jpg)");
        //! [9]
    }
 
    {
        //! [11]
        QString fileName = QFileDialog::getSaveFileName(this, tr("Save File"),
                                                        "/home/jana/untitled.png",
                                                        tr("Images (*.png *.xpm *.jpg)"));
        //! [11]
    }
 
    {
        //! [12]
        QString dir = QFileDialog::getExistingDirectory(this, tr("Open Directory"),
                                                        "/home",
                                                        QFileDialog::ShowDirsOnly
                                                        | QFileDialog::DontResolveSymlinks);
        //! [12]
    }
 
    {
        //! [13]
        QStringList mimeTypeFilters({"image/jpeg", // will show "JPEG image (*.jpeg *.jpg *.jpe)
                                     "image/png",  // will show "PNG image (*.png)"
                                     "application/octet-stream" // will show "All files (*)"
                                    });
 
        QFileDialog dialog(this);
        dialog.setMimeTypeFilters(mimeTypeFilters);
        dialog.exec();
        //! [13]
    }
 
    {
        /* For convinient quoting
        //! [14]
        "Images (*.png *.xpm *.jpg);;Text files (*.txt);;XML files (*.xml)"
        //! [14]
        */
    }
 
    {
        //! [15]
        auto fileContentReady = [](const QString &fileName, const QByteArray &fileContent) {
            if (fileName.isEmpty()) {
                // No file was selected
            } else {
                // Use fileName and fileContent
            }
        };
        QFileDialog::getOpenFileContent("Images (*.png *.xpm *.jpg)",  fileContentReady);
        //! [15]
    }
 
    {
        //! [16]
        QByteArray imageData; // obtained from e.g. QImage::save()
        QFileDialog::saveFileContent(imageData, "myimage.png");
        //! [16]
    }
}