feat: add pyqt stuff

application/gui.py

@@ -0,0 +1,120 @@
+from pathlib import Path
+import sys
+
+from PyQt5 import QtGui
+from PyQt5 import QtWidgets
+from PyQt5 import QtWebEngineWidgets
+from PyQt5 import QtCore
+
+from application import views
+
+
+PARENT = Path(__file__).parent
+TITLE = "Topics Explorer :: DARIAH-DE"
+ICON = str(Path(PARENT, "static", "img", "logos", "favicon-template.png"))
+PORT = 5000
+
+# This is for high DPI scaling:
+if hasattr(QtCore.Qt, "AA_EnableHighDpiScaling"):
+    QtWidgets.QApplication.setAttribute(QtCore.Qt.AA_EnableHighDpiScaling, True)
+if hasattr(QtCore.Qt, "AA_UseHighDpiPixmaps"):
+    QtWidgets.QApplication.setAttribute(QtCore.Qt.AA_UseHighDpiPixmaps, True)
+
+
+def download_request(item):
+        """Opens a file dialog to save the ZIP archive.
+        """
+        mimetype = item.mimeType()
+        if "octet-stream" in mimetype:
+            ext = ".png"
+        elif "svg" in item.mimeType():
+            ext = ".svg"
+        elif "zip" in mimetype:
+            ext = ".zip"
+        else:
+            ext = ""
+
+        path = QtWidgets.QFileDialog.getSaveFileName(None,
+                                                    "Select destination folder and file name",
+                                                    "",
+                                                    "")[0]
+        item.setPath("{path}{ext}".format(path=path, ext=ext))
+        item.accept()
+
+
+class ApplicationThread(QtCore.QThread):
+    def __init__(self, application, port=PORT):
+        super(ApplicationThread, self).__init__()
+        self.application = application
+        self.port = port
+
+    def __del__(self):
+        self.wait()
+
+    def run(self):
+        self.application.run(port=self.port)
+
+
+class WebPage(QtWebEngineWidgets.QWebEnginePage):
+    def __init__(self, root_url):
+        super(WebPage, self).__init__()
+        self.root_url = root_url
+
+    def home(self):
+        self.load(QtCore.QUrl(self.root_url))
+
+    def acceptNavigationRequest(self, url, kind, is_main_frame):
+        ready_url = url.toEncoded().data().decode()
+        is_clicked = kind == self.NavigationTypeLinkClicked
+
+        if is_clicked and (self.root_url not in ready_url):
+            QtGui.QDesktopServices.openUrl(url)
+            return False
+        return super(WebPage, self).acceptNavigationRequest(url, kind, is_main_frame)
+
+
+def init_gui(application, port=PORT, argv=None, title=TITLE, icon=ICON):
+    """Initialize Qt web engine, start Flask application.
+    """
+    if argv is None:
+        argv = sys.argv
+
+    # Starting the Flask application:
+    qtapp = QtWidgets.QApplication(argv)
+    web = ApplicationThread(application, port)
+    web.start()
+
+    def kill(application=web):
+        """Kill the Flask process.
+        """
+        application.terminate()
+
+    qtapp.aboutToQuit.connect(kill)
+
+    # Setting width and height individually based on the 
+    # screen resolution: 93% of the screen for width,
+    # 80% for height:
+    screen = qtapp.primaryScreen()
+    size = screen.size()
+    width = size.width() - size.width() / 100 * 7
+    height = size.height() - size.height() / 100 * 20
+
+    # Applying settings and loading the home page:
+    webview = QtWebEngineWidgets.QWebEngineView()
+    webview.resize(width, height)
+    webview.setWindowTitle(title)
+    webview.setWindowIcon(QtGui.QIcon(icon))
+    webview.load(QtCore.QUrl("http://localhost:{}".format(port)))
+
+    # If the user clicks a download button, a window pops up:
+    webview.page().profile().downloadRequested.connect(download_request)
+
+    # Show the webview:
+    webview.show()
+    return qtapp.exec_()
+
+
+def run():
+    """Run Topics Explorer.
+    """
+    sys.exit(init_gui(views.web))