qt: refactor please_wait layout to widget to better control UI, add in-page error view

electrum/gui/qt/wizard/server_connect.py

@@ -43,6 +43,7 @@ class WCAutoConnect(WizardComponent):
         choices = [_("Auto connect"), _("Select server manually")]
         self.clayout = ChoicesLayout(message, choices, on_clicked=self.on_updated)
         self.layout().addLayout(self.clayout.layout())
+        self.layout().addStretch(1)
         self._valid = True
 
     def apply(self):
@@ -65,6 +66,7 @@ class WCProxyAsk(WizardComponent):
         choices = [_("Yes"), _("No")]
         self.clayout = ChoicesLayout(message, choices)
         self.layout().addLayout(self.clayout.layout())
+        self.layout().addStretch(1)
         self._valid = True
 
     def apply(self):
@@ -77,6 +79,7 @@ class WCProxyConfig(WizardComponent):
         WizardComponent.__init__(self, parent, wizard, title=_("Proxy"))
         pw = ProxyWidget(self)
         self.layout().addWidget(pw)
+        self.layout().addStretch(1)
 
     def apply(self):
         # TODO
@@ -88,6 +91,7 @@ class WCServerConfig(WizardComponent):
         WizardComponent.__init__(self, parent, wizard, title=_("Server"))
         sw = ServerWidget(self)
         self.layout().addWidget(sw)
+        self.layout().addStretch(1)
 
     def apply(self):
         # TODO

electrum/gui/qt/wizard/wallet.py

@@ -180,6 +180,7 @@ class WCWalletName(WizardComponent):
         widget_create_new.setLayout(vbox_create_new)
         vbox_create_new.setContentsMargins(0, 0, 0, 0)
         self.layout().addWidget(widget_create_new)
+        self.layout().addStretch(1)
 
         temp_storage = None  # type: Optional[WalletStorage]
         wallet_folder = os.path.dirname(path)
@@ -268,6 +269,7 @@ class WCWalletType(WizardComponent):
         c_titles = [x[1] for x in choices]
         self.clayout = ChoicesLayout(message, c_titles)
         self.layout().addLayout(self.clayout.layout())
+        self.layout().addStretch(1)
         self._valid = True
 
     def apply(self):
@@ -289,6 +291,7 @@ class WCKeystoreType(WizardComponent):
         c_titles = [x[1] for x in choices]
         self.clayout = ChoicesLayout(message, c_titles)
         self.layout().addLayout(self.clayout.layout())
+        self.layout().addStretch(1)
         self._valid = True
 
     def apply(self):
@@ -327,6 +330,7 @@ class WCCreateSeed(WizardComponent):
             config=self.wizard.config,
         )
         self.layout().addLayout(self.slayout)
+        self.layout().addStretch(1)
         self.busy = False
         self.valid = True
 
@@ -466,6 +470,7 @@ class WCHaveSeed(WizardComponent):
         self.slayout.updated.connect(self.validate)
 
         self.layout().addLayout(self.slayout)
+        self.layout().addStretch(1)
 
     def is_seed(self, x):
         if self.wizard_data['wallet_type'] == 'standard':
@@ -780,6 +785,7 @@ class WCMultisig(WizardComponent):
         self.layout().addLayout(grid)
         self.layout().addSpacing(2 * char_width_in_lineedit())
         self.layout().addWidget(backup_warning_label)
+        self.layout().addStretch(1)
 
         self.n_edit = n_edit
         self.m_edit = m_edit

electrum/gui/qt/wizard/wizard.py

@@ -41,19 +41,34 @@ class QEAbstractWizard(QDialog):
 
         self.logo = QLabel()
 
-        self.please_wait_layout = QVBoxLayout()
-        self.please_wait_layout.addStretch(1)
-        self.please_wait = QLabel(_("Please wait..."))
-        self.please_wait.setAlignment(Qt.AlignCenter)
-        self.please_wait.setVisible(False)
-        self.please_wait_layout.addWidget(self.please_wait)
-        self.please_wait_layout.addStretch(1)
+        please_wait_layout = QVBoxLayout()
+        please_wait_layout.addStretch(1)
+        please_wait_l = QLabel(_("Please wait..."))
+        please_wait_l.setAlignment(Qt.AlignCenter)
+        please_wait_layout.addWidget(please_wait_l)
+        please_wait_layout.addStretch(1)
+        self.please_wait = QWidget()
+        self.please_wait.setLayout(please_wait_layout)
+
+        error_layout = QVBoxLayout()
+        error_layout.addStretch(1)
+        error_l = QLabel(_("Error!"))
+        error_l.setAlignment(Qt.AlignCenter)
+        error_layout.addWidget(error_l)
+        self.error_msg = QLabel()
+        self.error_msg.setAlignment(Qt.AlignCenter)
+        error_layout.addWidget(self.error_msg)
+        error_layout.addStretch(1)
+        self.error = QWidget()
+        self.error.setLayout(error_layout)
 
         outer_vbox = QVBoxLayout(self)
         inner_vbox = QVBoxLayout()
         inner_vbox.addWidget(self.title)
         inner_vbox.addWidget(self.main_widget)
-        inner_vbox.addLayout(self.please_wait_layout)
+        inner_vbox.addWidget(self.please_wait)
+        inner_vbox.addWidget(self.error)
+
         scroll_widget = QWidget()
         scroll_widget.setLayout(inner_vbox)
         scroll = QScrollArea()
@@ -139,8 +154,10 @@ class QEAbstractWizard(QDialog):
         self.back_button.setText(_('Back') if self.can_go_back() else _('Cancel'))
         self.next_button.setText(_('Next') if not self.is_last(page.wizard_data) else _('Finish'))
         self.next_button.setEnabled(page.valid)
-        self.main_widget.setVisible(not page.busy)
+        self.main_widget.setVisible(not page.busy and not bool(page.error))
         self.please_wait.setVisible(page.busy)
+        self.error_msg.setText(str(page.error))
+        self.error.setVisible(not page.busy and bool(page.error))
         icon = page.params.get('icon', icon_path('electrum.png'))
         if icon != self.icon_filename:
             self.set_icon(icon)
@@ -195,6 +212,7 @@ class WizardComponent(QWidget):
         self.wizard_data = {}
         self.title = title if title is not None else 'No title'
         self.wizard = wizard
+        self.error = ''
         self._valid = False
         self._busy = False