qt: implement completer for PayToEdit

electrum/contacts.py

@@ -64,6 +64,7 @@ class Contacts(dict, Logger):
 
     def save(self):
         self.db.put('contacts', dict(self))
+        trigger_callback('contacts_updated')
 
     def import_file(self, path):
         data = read_json_file(path)

electrum/gui/qt/paytoedit.py

@@ -26,13 +26,14 @@
 from functools import partial
 from typing import Optional, TYPE_CHECKING
 
-from PyQt6.QtCore import Qt, QTimer, QSize
+from PyQt6.QtCore import Qt, QTimer, QSize, QStringListModel
 from PyQt6.QtCore import pyqtSignal
 from PyQt6.QtGui import QFontMetrics, QFont
-from PyQt6.QtWidgets import QTextEdit, QWidget, QLineEdit, QStackedLayout
+from PyQt6.QtWidgets import QTextEdit, QWidget, QLineEdit, QStackedLayout, QCompleter
 
 from electrum.payment_identifier import PaymentIdentifier
 from electrum.logging import Logger
+from electrum.util import EventListener, event_listener
 
 from . import util
 from .util import MONOSPACE_FONT, GenericInputHandler, editor_contextMenuEvent, ColorScheme
@@ -94,7 +95,7 @@ class ResizingTextEdit(QTextEdit):
         return QSize(0, self.minimumHeight())
 
 
-class PayToEdit(QWidget, Logger, GenericInputHandler):
+class PayToEdit(QWidget, Logger, GenericInputHandler, EventListener):
     paymentIdentifierChanged = pyqtSignal()
     textChanged = pyqtSignal()
 
@@ -107,6 +108,8 @@ class PayToEdit(QWidget, Logger, GenericInputHandler):
         self._layout = QStackedLayout()
         self.setLayout(self._layout)
 
+        self.send_tab = send_tab
+
         def text_edit_changed():
             text = self.text_edit.toPlainText()
             if self._text != text:
@@ -133,6 +136,21 @@ class PayToEdit(QWidget, Logger, GenericInputHandler):
         self.text_edit.textReallyChanged.connect(text_edit_changed)
         self.text_edit.resized.connect(text_edit_resized)
 
+        def on_completed(item: str):
+            text = self._completer_contacts[1][self._completer_contacts[0].index(item)]
+            self.try_payment_identifier(text)
+            self.completer.popup().hide()
+
+        self.completer = QCompleter()
+        self.completer.setCompletionMode(QCompleter.CompletionMode.PopupCompletion)
+        self.completer.setCaseSensitivity(Qt.CaseSensitivity.CaseInsensitive)
+        self.completer.setFilterMode(Qt.MatchFlag.MatchContains)
+        self.completer.activated.connect(on_completed)
+
+        self.update_completer()
+
+        self.line_edit.setCompleter(self.completer)
+
         self.textChanged.connect(self._handle_text_change)
 
         self._layout.addWidget(self.line_edit)
@@ -185,6 +203,21 @@ class PayToEdit(QWidget, Logger, GenericInputHandler):
 
         self.payment_identifier = None  # type: Optional[PaymentIdentifier]
 
+        self.register_callbacks()
+        self.destroyed.connect(lambda: self.unregister_callbacks())
+
+    @event_listener
+    def on_event_contacts_updated(self):
+        self.update_completer()
+
+    def update_completer(self):
+        self._completer_contacts = [], []
+        for k, v in self.send_tab.wallet.contacts.items():
+            self._completer_contacts[0].append(f'{v[1]} <{k}>')
+            self._completer_contacts[1].append(k)
+
+        self.completer.setModel(QStringListModel(self._completer_contacts[0]))
+
     @property
     def multiline(self):
         return self._multiline