Add tiny dialog for OAuth2.0 flow

bulk_reminders/oauth.py

@@ -0,0 +1,28 @@
+from typing import Callable, Optional
+
+from PyQt5.QtCore import Qt
+from PyQt5.QtWidgets import QDialog
+
+from bulk_reminders.oauth_base import Ui_Dialog
+
+class OAuthDialog(QDialog, Ui_Dialog):
+    def __init__(self, *args, callback: Optional[Callable] = None, **kwargs):
+        super(QDialog, self).__init__(*args, **kwargs)
+        self._closable = False
+        self.setupUi(self)
+        self.show()
+
+        if callback is not None:
+            callback()
+            self.accept()
+        else:
+            self.reject()
+        self._closable = True
+
+    def closeEvent(self, evnt):
+        if self.closable:
+            super(QDialog, self).closeEvent(evnt)
+        else:
+            evnt.ignore()
+            self.setWindowState(Qt.WindowMinimized)
+