1 files changed, 179 insertions, 0 deletions
diff --git a/examples/network/downloader/downloader.py b/examples/network/downloader/downloader.py
new file mode 100644
index 000000000..fba0cb980
--- /dev/null
+++ b/examples/network/downloader/downloader.py
@@ -0,0 +1,179 @@
+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+from PySide6.QtWidgets import (
+    QWidget,
+    QApplication,
+    QMessageBox,
+    QLineEdit,
+    QProgressBar,
+    QPushButton,
+    QHBoxLayout,
+    QVBoxLayout,
+    QStyle,
+    QFileDialog,
+)
+from PySide6.QtCore import QStandardPaths, QUrl, QFile, QSaveFile, QDir, QIODevice, Slot
+from PySide6.QtNetwork import QNetworkReply, QNetworkRequest, QNetworkAccessManager
+import sys
+
+
+class DownloaderWidget(QWidget):
+    """A widget to download a http file to a destination file"""
+
+    def __init__(self, parent=None):
+        super().__init__(parent)
+
+        self.manager = QNetworkAccessManager(self)
+        self.link_box = QLineEdit()
+        self.dest_box = QLineEdit()
+        self.progress_bar = QProgressBar()
+
+        self.start_button = QPushButton("Start")
+        self.abort_button = QPushButton("Abort")
+
+        self.link_box.setPlaceholderText("Download Link ...")
+
+        self._open_folder_action = self.dest_box.addAction(
+            qApp.style().standardIcon(QStyle.SP_DirOpenIcon),  # noqa: F821
+            QLineEdit.TrailingPosition
+        )
+        self._open_folder_action.triggered.connect(self.on_open_folder)
+
+        #  Current QFile
+        self.file = None
+        # Current QNetworkReply
+        self.reply = None
+
+        #  Default http url
+        self.link_box.setText(
+            "http://master.qt.io/archive/qt/6.0/6.0.1/single/qt-everywhere-src-6.0.1.zip"
+        )
+
+        #  Default destination dir
+        self.dest_box.setText(
+            QDir.fromNativeSeparators(
+                QStandardPaths.writableLocation(QStandardPaths.DownloadLocation)
+            )
+        )
+
+        # buttons bar layout
+        hlayout = QHBoxLayout()
+        hlayout.addStretch()
+        hlayout.addWidget(self.start_button)
+        hlayout.addWidget(self.abort_button)
+
+        # main layout
+        vlayout = QVBoxLayout(self)
+        vlayout.addWidget(self.link_box)
+        vlayout.addWidget(self.dest_box)
+        vlayout.addWidget(self.progress_bar)
+        vlayout.addStretch()
+        vlayout.addLayout(hlayout)
+
+        self.resize(300, 100)
+
+        self.start_button.clicked.connect(self.on_start)
+        self.abort_button.clicked.connect(self.on_abort)
+
+    @Slot()
+    def on_start(self):
+        """When user press start button"""
+
+        #  http file
+        url_file = QUrl(self.link_box.text())
+
+        # destination file
+        dest_path = QDir.fromNativeSeparators(self.dest_box.text().strip())
+        dest_file = QDir(dest_path).filePath(url_file.fileName())
+
+        # Ask a question if file already exists
+        if QFile.exists(dest_file):
+            ret = QMessageBox.question(
+                self,
+                "File exists",
+                "Do you want to override the file ?",
+                QMessageBox.Yes | QMessageBox.No,
+            )
+            if ret == QMessageBox.No:
+                return
+
+            QFile.remove(dest_file)
+
+        self.start_button.setDisabled(True)
+        # Create the file in write mode to append bytes
+        self.file = QSaveFile(dest_file)
+
+        if self.file.open(QIODevice.WriteOnly):
+
+            # Start a GET HTTP request
+            self.reply = self.manager.get(QNetworkRequest(url_file))
+            self.reply.downloadProgress.connect(self.on_progress)
+            self.reply.finished.connect(self.on_finished)
+            self.reply.readyRead.connect(self.on_ready_read)
+            self.reply.errorOccurred.connect(self.on_error)
+        else:
+            error = self.file.errorString()
+            print(f"Cannot open device: {error}")
+
+    @Slot()
+    def on_abort(self):
+        """When user press abort button"""
+        if self.reply:
+            self.reply.abort()
+            self.progress_bar.setValue(0)
+
+        if self.file:
+            self.file.cancelWriting()
+
+        self.start_button.setDisabled(False)
+
+    @Slot()
+    def on_ready_read(self):
+        """ Get available bytes and store them into the file"""
+        if self.reply:
+            if self.reply.error() == QNetworkReply.NoError:
+                self.file.write(self.reply.readAll())
+
+    @Slot()
+    def on_finished(self):
+        """ Delete reply and close the file"""
+        if self.reply:
+            self.reply.deleteLater()
+
+        if self.file:
+            self.file.commit()
+
+        self.start_button.setDisabled(False)
+
+    @Slot(int, int)
+    def on_progress(self, bytesReceived: int, bytesTotal: int):
+        """ Update progress bar"""
+        self.progress_bar.setRange(0, bytesTotal)
+        self.progress_bar.setValue(bytesReceived)
+
+    @Slot(QNetworkReply.NetworkError)
+    def on_error(self, code: QNetworkReply.NetworkError):
+        """ Show a message if an error happen """
+        if self.reply:
+            QMessageBox.warning(self, "Error Occurred", self.reply.errorString())
+
+    @Slot()
+    def on_open_folder(self):
+
+        dir_path = QFileDialog.getExistingDirectory(
+            self, "Open Directory", QDir.homePath(), QFileDialog.ShowDirsOnly
+        )
+
+        if dir_path:
+            dest_dir = QDir(dir_path)
+            self.dest_box.setText(QDir.fromNativeSeparators(dest_dir.path()))
+
+
+if __name__ == "__main__":
+
+    app = QApplication(sys.argv)
+
+    w = DownloaderWidget()
+    w.show()
+    sys.exit(app.exec())