always enable qr scanner plugin

gui/qt/main_window.py

@@ -360,6 +360,7 @@ class ElectrumWindow(QMainWindow):
         raw_transaction_menu.addAction(_("&From file"), self.do_process_from_file)
         raw_transaction_menu.addAction(_("&From text"), self.do_process_from_text)
         raw_transaction_menu.addAction(_("&From the blockchain"), self.do_process_from_txid)
+        raw_transaction_menu.addAction(_("&From QR code"), self.read_tx_from_qrcode)
         self.raw_transaction_menu = raw_transaction_menu
 
         help_menu = menubar.addMenu(_("&Help"))
@@ -2091,6 +2092,21 @@ class ElectrumWindow(QMainWindow):
             QMessageBox.critical(None, _("Unable to parse transaction"), _("Electrum was unable to parse your transaction"))
 
 
+    def read_tx_from_qrcode(self):
+        data = run_hook('scan_qr_hook')
+        if not data:
+            return
+        # transactions are binary, but qrcode seems to return utf8...
+        z = data.decode('utf8')
+        s = ''
+        for b in z:
+            s += chr(ord(b))
+        data = s.encode('hex')
+        tx = self.tx_from_text(data)
+        if not tx:
+            return
+        self.show_transaction(tx)
+
 
     def read_tx_from_file(self):
         fileName = self.getOpenFileName(_("Select your transaction file"), "*.txn")

gui/qt/qrtextedit.py

@@ -12,7 +12,6 @@ class QRTextEdit(QPlainTextEdit):
         self.button.setVisible(True)
         self.button.clicked.connect(lambda: self.qr_show() if self.isReadOnly() else self.qr_input())
         self.setText = self.setPlainText
-        self.scan_f = self.setText
 
     def resizeEvent(self, e):
         o = QPlainTextEdit.resizeEvent(self, e)
@@ -36,5 +35,7 @@ class QRTextEdit(QPlainTextEdit):
 
     def qr_input(self):
         from electrum.plugins import run_hook
-        if not run_hook('scan_qr_hook', self.scan_f):
-            QMessageBox.warning(self, _('Error'), _('QR Scanner not enabled'), _('OK'))
+        data = run_hook('scan_qr_hook')
+        if type(data) != str:
+            return
+        self.setText(data)