Qt: add JMInputDialog with open/async support

scripts/joinmarket-qt.py

@@ -78,11 +78,12 @@ from jmclient import load_program_config, get_network, update_persist_config,\
     ScheduleGenerationErrorNoFunds, Storage
 from jmclient.wallet import BaseWallet
 
-from qtsupport import ScheduleWizard, TumbleRestartWizard, config_tips,\
-    config_types, QtHandler, XStream, Buttons, OkButton, CancelButton,\
-    JMPasswordDialog, MyTreeWidget, JMQtMessageBox, BLUE_FG,\
-    donation_more_message, BitcoinAmountEdit, JMIntValidator,\
-    ReceiveBIP78Dialog, QRCodePopup, JMExportPrivkeysDialog
+from qtsupport import (ScheduleWizard, TumbleRestartWizard, config_tips,
+    config_types, QtHandler, XStream, Buttons, OkButton, CancelButton,
+    JMPasswordDialog, MyTreeWidget, JMQtMessageBox, BLUE_FG,
+    donation_more_message, BitcoinAmountEdit, JMIntValidator,
+    ReceiveBIP78Dialog, QRCodePopup, JMExportPrivkeysDialog,
+    JMInputDialog)
 
 from twisted.internet import task
 
@@ -2378,7 +2379,7 @@ class JMMainWindow(QMainWindow):
                              title="Passphrase changed")
 
     async def getTestnetSeed(self):
-        text, ok = QInputDialog.getText(
+        text, ok = await JMInputDialog(
             self, 'Testnet seed', 'Enter a 32 char hex string as seed:')
         text = text.strip()
         if not ok or not text:

scripts/qtsupport.py

@@ -149,6 +149,39 @@ donation_more_message = '\n'.join(
 """
 
 
+async def JMInputDialog(parent, title, label, echo_mode=QLineEdit.Normal,
+                        text='', finished_cb=None):
+    title = "JoinmarketQt - " + title
+
+    class QtInputDialog(QInputDialog):
+
+        def __init__(self, parent):
+            QInputDialog.__init__(self, parent)
+            self.result_fut = asyncio.get_event_loop().create_future()
+
+        @QtCore.Slot(QMessageBox.StandardButton)
+        def on_finished(self, button):
+            self.result_fut.set_result(button)
+
+        async def result(self):
+            await self.result_fut
+            return self.result_fut.result()
+
+    d = QtInputDialog(parent)
+    d.setWindowTitle(title)
+    d.setLabelText(label)
+    d.setTextEchoMode(echo_mode)
+    d.setTextValue(text)
+    d.finished.connect(d.on_finished)
+    d.open()
+    result = await d.result()
+    if finished_cb is not None:
+        finished_cb(result)
+    if result != QDialog.Accepted:
+        return '', False
+    return d.textValue(), True
+
+
 async def JMQtMessageBox(parent, msg, mbtype='info', title='',
                          detailed_text=None, informative_text=None,
                          finished_cb=None):