Qt: new onchain tx creation flow:

- transaction_dialog is read-only
 - ConfirmTxDialog and RBF dialogs inherit from TxEditor
 - TxEditors are configurable

electrum/gui/qt/confirm_tx_dialog.py

@@ -24,31 +24,45 @@
 # SOFTWARE.
 
 from decimal import Decimal
+from functools import partial
 from typing import TYPE_CHECKING, Optional, Union
 
 from PyQt5.QtCore import Qt
-from PyQt5.QtWidgets import QVBoxLayout, QLabel, QGridLayout, QPushButton, QLineEdit
+from PyQt5.QtGui import QIcon
+
+from PyQt5.QtWidgets import QWidget, QHBoxLayout, QVBoxLayout, QLabel, QGridLayout, QPushButton, QLineEdit, QToolButton, QMenu
 
 from electrum.i18n import _
 from electrum.util import NotEnoughFunds, NoDynamicFeeEstimates
+from electrum.util import quantize_feerate
 from electrum.plugin import run_hook
 from electrum.transaction import Transaction, PartialTransaction
 from electrum.wallet import InternalAddressCorruption
+from electrum.simple_config import SimpleConfig
 
 from .util import (WindowModalDialog, ColorScheme, HelpLabel, Buttons, CancelButton,
-                   BlockingWaitingDialog, PasswordLineEdit, WWLabel)
+                   BlockingWaitingDialog, PasswordLineEdit, WWLabel, read_QIcon)
 
 from .fee_slider import FeeSlider, FeeComboBox
 
 if TYPE_CHECKING:
     from .main_window import ElectrumWindow
 
+from .transaction_dialog import TxSizeLabel, TxFiatLabel, TxInOutWidget
+from .fee_slider import FeeSlider, FeeComboBox
+from .amountedit import FeerateEdit, BTCAmountEdit
+from .locktimeedit import LockTimeEdit
+
 
+class TxEditor(WindowModalDialog):
 
-class TxEditor:
+    def __init__(self, *, title='',
+                 window: 'ElectrumWindow',
+                 make_tx,
+                 output_value: Union[int, str] = None,
+                 allow_preview=True):
 
-    def __init__(self, *, window: 'ElectrumWindow', make_tx,
-                 output_value: Union[int, str] = None, is_sweep: bool):
+        WindowModalDialog.__init__(self, window, title=title)
         self.main_window = window
         self.make_tx = make_tx
         self.output_value = output_value
@@ -58,9 +72,40 @@ class TxEditor:
         self.not_enough_funds = False
         self.no_dynfee_estimates = False
         self.needs_update = False
-        self.password_required = self.wallet.has_keystore_encryption() and not is_sweep
+        # preview is disabled for lightning channel funding
+        self.allow_preview = allow_preview
+        self.is_preview = False
+
+        self.locktime_e = LockTimeEdit(self)
+        self.locktime_label = QLabel(_("LockTime") + ": ")
+        self.io_widget = TxInOutWidget(self.main_window, self.wallet)
+        self.create_fee_controls()
+
+        vbox = QVBoxLayout()
+        self.setLayout(vbox)
+
+        top = self.create_top_bar(self.help_text)
+        grid = self.create_grid()
+
+        vbox.addLayout(top)
+        vbox.addLayout(grid)
+        self.message_label = WWLabel('\n')
+        vbox.addWidget(self.message_label)
+        vbox.addWidget(self.io_widget)
+        buttons = self.create_buttons_bar()
+        vbox.addStretch(1)
+        vbox.addLayout(buttons)
+
+        self.set_io_visible(self.config.get('show_tx_io', False))
+        self.set_fee_edit_visible(self.config.get('show_fee_details', False))
+        self.set_locktime_visible(self.config.get('show_locktime', False))
+        self.set_preview_visible(self.config.get('show_preview_button', False))
+        self.update_fee_target()
+        self.resize(self.layout().sizeHint())
+
         self.main_window.gui_object.timer.timeout.connect(self.timer_actions)
 
+
     def timer_actions(self):
         if self.needs_update:
             self.update_tx()
@@ -70,7 +115,7 @@ class TxEditor:
     def stop_editor_updates(self):
         self.main_window.gui_object.timer.timeout.disconnect(self.timer_actions)
 
-    def fee_slider_callback(self, dyn, pos, fee_rate):
+    def set_fee_config(self, dyn, pos, fee_rate):
         if dyn:
             if self.config.use_mempool_fees():
                 self.config.set_key('depth_level', pos, False)
@@ -78,10 +123,399 @@ class TxEditor:
                 self.config.set_key('fee_level', pos, False)
         else:
             self.config.set_key('fee_per_kb', fee_rate, False)
+
+    def update_tx(self, *, fallback_to_zero_fee: bool = False):
+        raise NotImplementedError()
+
+    def update_fee_target(self):
+        text = self.fee_slider.get_dynfee_target()
+        self.fee_target.setText(text)
+        self.fee_target.setVisible(bool(text)) # hide in static mode
+
+    def update_feerate_label(self):
+        self.feerate_label.setText(self.feerate_e.text() + ' ' + self.feerate_e.base_unit())
+
+    def create_fee_controls(self):
+
+        self.fee_label = QLabel('')
+        self.fee_label.setTextInteractionFlags(Qt.TextSelectableByMouse)
+
+        self.size_label = TxSizeLabel()
+        self.size_label.setAlignment(Qt.AlignCenter)
+        self.size_label.setAmount(0)
+        self.size_label.setStyleSheet(ColorScheme.DEFAULT.as_stylesheet())
+
+        self.feerate_label = QLabel('')
+        self.feerate_label.setTextInteractionFlags(Qt.TextSelectableByMouse)
+
+        self.fiat_fee_label = TxFiatLabel()
+        self.fiat_fee_label.setAlignment(Qt.AlignCenter)
+        self.fiat_fee_label.setAmount(0)
+        self.fiat_fee_label.setStyleSheet(ColorScheme.DEFAULT.as_stylesheet())
+
+        self.feerate_e = FeerateEdit(lambda: 0)
+        self.feerate_e.setAmount(self.config.fee_per_byte())
+        self.feerate_e.textEdited.connect(partial(self.on_fee_or_feerate, self.feerate_e, False))
+        self.feerate_e.editingFinished.connect(partial(self.on_fee_or_feerate, self.feerate_e, True))
+        self.update_feerate_label()
+
+        self.fee_e = BTCAmountEdit(self.main_window.get_decimal_point)
+        self.fee_e.textEdited.connect(partial(self.on_fee_or_feerate, self.fee_e, False))
+        self.fee_e.editingFinished.connect(partial(self.on_fee_or_feerate, self.fee_e, True))
+
+        self.feerate_e.setFixedWidth(150)
+        self.fee_e.setFixedWidth(150)
+
+        self.fee_e.textChanged.connect(self.entry_changed)
+        self.feerate_e.textChanged.connect(self.entry_changed)
+
+        self.fee_target = QLabel('')
+        self.fee_slider = FeeSlider(self, self.config, self.fee_slider_callback)
+        self.fee_combo = FeeComboBox(self.fee_slider)
+
+        def feerounding_onclick():
+            text = (self.feerounding_text + '\n\n' +
+                    _('To somewhat protect your privacy, Electrum tries to create change with similar precision to other outputs.') + ' ' +
+                    _('At most 100 satoshis might be lost due to this rounding.') + ' ' +
+                    _("You can disable this setting in '{}'.").format(_('Preferences')) + '\n' +
+                    _('Also, dust is not kept as change, but added to the fee.')  + '\n' +
+                    _('Also, when batching RBF transactions, BIP 125 imposes a lower bound on the fee.'))
+            self.show_message(title=_('Fee rounding'), msg=text)
+
+        self.feerounding_icon = QToolButton()
+        self.feerounding_icon.setIcon(QIcon())
+        self.feerounding_icon.setAutoRaise(True)
+        self.feerounding_icon.clicked.connect(feerounding_onclick)
+
+        self.fee_hbox = fee_hbox = QHBoxLayout()
+        fee_hbox.addWidget(self.feerate_e)
+        fee_hbox.addWidget(self.feerate_label)
+        fee_hbox.addWidget(self.size_label)
+        fee_hbox.addWidget(self.fee_e)
+        fee_hbox.addWidget(self.fee_label)
+        fee_hbox.addWidget(self.fiat_fee_label)
+        fee_hbox.addWidget(self.feerounding_icon)
+        fee_hbox.addStretch()
+
+        self.fee_target_hbox = fee_target_hbox = QHBoxLayout()
+        fee_target_hbox.addWidget(self.fee_target)
+        fee_target_hbox.addWidget(self.fee_slider)
+        fee_target_hbox.addWidget(self.fee_combo)
+        fee_target_hbox.addStretch()
+
+        # set feerate_label to same size as feerate_e
+        self.feerate_label.setFixedSize(self.feerate_e.sizeHint())
+        self.fee_label.setFixedSize(self.fee_e.sizeHint())
+        self.fee_slider.setFixedWidth(200)
+        self.fee_target.setFixedSize(self.feerate_e.sizeHint())
+
+    def _trigger_update(self):
+        # set tx to None so that the ok button is disabled while we compute the new tx
+        self.tx = None
+        self.update()
         self.needs_update = True
 
+    def fee_slider_callback(self, dyn, pos, fee_rate):
+        self.set_fee_config(dyn, pos, fee_rate)
+        self.fee_slider.activate()
+        if fee_rate:
+            fee_rate = Decimal(fee_rate)
+            self.feerate_e.setAmount(quantize_feerate(fee_rate / 1000))
+        else:
+            self.feerate_e.setAmount(None)
+        self.fee_e.setModified(False)
+        self.update_fee_target()
+        self.update_feerate_label()
+        self._trigger_update()
+
+    def on_fee_or_feerate(self, edit_changed, editing_finished):
+        edit_other = self.feerate_e if edit_changed == self.fee_e else self.fee_e
+        if editing_finished:
+            if edit_changed.get_amount() is None:
+                # This is so that when the user blanks the fee and moves on,
+                # we go back to auto-calculate mode and put a fee back.
+                edit_changed.setModified(False)
+        else:
+            # edit_changed was edited just now, so make sure we will
+            # freeze the correct fee setting (this)
+            edit_other.setModified(False)
+        self.fee_slider.deactivate()
+        self._trigger_update()
+
+    def is_send_fee_frozen(self):
+        return self.fee_e.isVisible() and self.fee_e.isModified() \
+               and (self.fee_e.text() or self.fee_e.hasFocus())
+
+    def is_send_feerate_frozen(self):
+        return self.feerate_e.isVisible() and self.feerate_e.isModified() \
+               and (self.feerate_e.text() or self.feerate_e.hasFocus())
+
+    def set_feerounding_text(self, num_satoshis_added):
+        self.feerounding_text = (_('Additional {} satoshis are going to be added.')
+                                 .format(num_satoshis_added))
+
     def get_fee_estimator(self):
-        return None
+        if self.is_send_fee_frozen() and self.fee_e.get_amount() is not None:
+            fee_estimator = self.fee_e.get_amount()
+        elif self.is_send_feerate_frozen() and self.feerate_e.get_amount() is not None:
+            amount = self.feerate_e.get_amount()  # sat/byte feerate
+            amount = 0 if amount is None else amount * 1000  # sat/kilobyte feerate
+            fee_estimator = partial(
+                SimpleConfig.estimate_fee_for_feerate, amount)
+        else:
+            fee_estimator = None
+        return fee_estimator
+
+    def entry_changed(self):
+        # blue color denotes auto-filled values
+        text = ""
+        fee_color = ColorScheme.DEFAULT
+        feerate_color = ColorScheme.DEFAULT
+        if self.not_enough_funds:
+            fee_color = ColorScheme.RED
+            feerate_color = ColorScheme.RED
+        elif self.fee_e.isModified():
+            feerate_color = ColorScheme.BLUE
+        elif self.feerate_e.isModified():
+            fee_color = ColorScheme.BLUE
+        else:
+            fee_color = ColorScheme.BLUE
+            feerate_color = ColorScheme.BLUE
+        self.fee_e.setStyleSheet(fee_color.as_stylesheet())
+        self.feerate_e.setStyleSheet(feerate_color.as_stylesheet())
+        #
+        self.needs_update = True
+
+    def update_fee_fields(self):
+        freeze_fee = self.is_send_fee_frozen()
+        freeze_feerate = self.is_send_feerate_frozen()
+        tx = self.tx
+        if self.no_dynfee_estimates and tx:
+            size = tx.estimated_size()
+            self.size_label.setAmount(size)
+            #self.size_e.setAmount(size)
+        if self.not_enough_funds or self.no_dynfee_estimates:
+            if not freeze_fee:
+                self.fee_e.setAmount(None)
+            if not freeze_feerate:
+                self.feerate_e.setAmount(None)
+            self.feerounding_icon.setIcon(QIcon())
+            return
+
+        assert tx is not None
+        size = tx.estimated_size()
+        fee = tx.get_fee()
+
+        #self.size_e.setAmount(size)
+        self.size_label.setAmount(size)
+        fiat_fee = self.main_window.format_fiat_and_units(fee)
+        self.fiat_fee_label.setAmount(fiat_fee)
+
+        # Displayed fee/fee_rate values are set according to user input.
+        # Due to rounding or dropping dust in CoinChooser,
+        # actual fees often differ somewhat.
+        if freeze_feerate or self.fee_slider.is_active():
+            displayed_feerate = self.feerate_e.get_amount()
+            if displayed_feerate is not None:
+                displayed_feerate = quantize_feerate(displayed_feerate)
+            elif self.fee_slider.is_active():
+                # fallback to actual fee
+                displayed_feerate = quantize_feerate(fee / size) if fee is not None else None
+                self.feerate_e.setAmount(displayed_feerate)
+            displayed_fee = round(displayed_feerate * size) if displayed_feerate is not None else None
+            self.fee_e.setAmount(displayed_fee)
+        else:
+            if freeze_fee:
+                displayed_fee = self.fee_e.get_amount()
+            else:
+                # fallback to actual fee if nothing is frozen
+                displayed_fee = fee
+                self.fee_e.setAmount(displayed_fee)
+            displayed_fee = displayed_fee if displayed_fee else 0
+            displayed_feerate = quantize_feerate(displayed_fee / size) if displayed_fee is not None else None
+            self.feerate_e.setAmount(displayed_feerate)
+
+        # set fee rounding icon to empty if there is no rounding
+        feerounding = (fee - displayed_fee) if (fee and displayed_fee is not None) else 0
+        self.set_feerounding_text(int(feerounding))
+        self.feerounding_icon.setToolTip(self.feerounding_text)
+        self.feerounding_icon.setIcon(read_QIcon('info.png') if abs(feerounding) >= 1 else QIcon())
+
+
+    def create_buttons_bar(self):
+        self.preview_button = QPushButton(_('Preview'))
+        self.preview_button.clicked.connect(self.on_preview)
+        self.ok_button = QPushButton(_('OK'))
+        self.ok_button.clicked.connect(self.on_send)
+        self.ok_button.setDefault(True)
+        buttons = Buttons(CancelButton(self), self.preview_button, self.ok_button)
+        return buttons
+
+    def create_top_bar(self, text):
+        self.pref_menu = QMenu()
+        self.m1 = self.pref_menu.addAction('Show inputs/outputs', self.toggle_io_visibility)
+        self.m1.setCheckable(True)
+        self.m2 = self.pref_menu.addAction('Edit fees', self.toggle_fee_details)
+        self.m2.setCheckable(True)
+        self.m3 = self.pref_menu.addAction('Edit Locktime', self.toggle_locktime)
+        self.m3.setCheckable(True)
+        self.m4 = self.pref_menu.addAction('Show Preview Button', self.toggle_preview_button)
+        self.m4.setCheckable(True)
+        self.m4.setEnabled(self.allow_preview)
+        self.pref_button = QToolButton()
+        self.pref_button.setIcon(read_QIcon("preferences.png"))
+        self.pref_button.setMenu(self.pref_menu)
+        self.pref_button.setPopupMode(QToolButton.InstantPopup)
+        hbox = QHBoxLayout()
+        hbox.addWidget(QLabel(text))
+        hbox.addStretch()
+        hbox.addWidget(self.pref_button)
+        return hbox
+
+    def toggle_io_visibility(self):
+        b = not self.config.get('show_tx_io', False)
+        self.config.set_key('show_tx_io', b)
+        self.set_io_visible(b)
+        #self.resize(self.layout().sizeHint())
+        self.setFixedSize(self.layout().sizeHint())
+
+    def toggle_fee_details(self):
+        b = not self.config.get('show_fee_details', False)
+        self.config.set_key('show_fee_details', b)
+        self.set_fee_edit_visible(b)
+        self.setFixedSize(self.layout().sizeHint())
+
+    def toggle_locktime(self):
+        b = not self.config.get('show_locktime', False)
+        self.config.set_key('show_locktime', b)
+        self.set_locktime_visible(b)
+        self.setFixedSize(self.layout().sizeHint())
+
+    def toggle_preview_button(self):
+        b = not self.config.get('show_preview_button', False)
+        self.config.set_key('show_preview_button', b)
+        self.set_preview_visible(b)
+
+    def set_preview_visible(self, b):
+        b = b and self.allow_preview
+        self.preview_button.setVisible(b)
+        self.m4.setChecked(b)
+
+    def set_io_visible(self, b):
+        self.io_widget.setVisible(b)
+        self.m1.setChecked(b)
+
+    def set_fee_edit_visible(self, b):
+        detailed = [self.feerounding_icon, self.feerate_e, self.fee_e]
+        basic = [self.fee_label, self.feerate_label]
+        # first hide, then show
+        for w in (basic if b else detailed):
+            w.hide()
+        for w in (detailed if b else basic):
+            w.show()
+        self.m2.setChecked(b)
+
+    def set_locktime_visible(self, b):
+        for w in [
+                self.locktime_e,
+                self.locktime_label]:
+            w.setVisible(b)
+        self.m3.setChecked(b)
+
+    def run(self):
+        cancelled = not self.exec_()
+        self.stop_editor_updates()
+        self.deleteLater()  # see #3956
+        return self.tx if not cancelled else None
+
+    def on_send(self):
+        self.accept()
+
+    def on_preview(self):
+        self.is_preview = True
+        self.accept()
+
+    def toggle_send_button(self, enable: bool, *, message: str = None):
+        if message is None:
+            self.message_label.setStyleSheet(None)
+            self.message_label.setText(' ')
+        else:
+            self.message_label.setStyleSheet(ColorScheme.RED.as_stylesheet())
+            self.message_label.setText(message)
+
+        self.setFixedSize(self.layout().sizeHint())
+        self.preview_button.setEnabled(enable)
+        self.ok_button.setEnabled(enable)
+
+    def update(self):
+        tx = self.tx
+        self._update_amount_label()
+        if self.not_enough_funds:
+            text = self.main_window.send_tab.get_text_not_enough_funds_mentioning_frozen()
+            self.toggle_send_button(False, message=text)
+            return
+        if not tx:
+            self.toggle_send_button(False)
+            return
+        self.update_fee_fields()
+        if self.locktime_e.get_locktime() is None:
+            self.locktime_e.set_locktime(self.tx.locktime)
+        self.io_widget.update(tx)
+        fee = tx.get_fee()
+        assert fee is not None
+        self.fee_label.setText(self.main_window.config.format_amount_and_units(fee))
+
+        fee_rate = fee // tx.estimated_size()
+        #self.feerate_label.setText(self.main_window.format_amount(fee_rate))
+
+        # extra fee
+        x_fee = run_hook('get_tx_extra_fee', self.wallet, tx)
+        if x_fee:
+            x_fee_address, x_fee_amount = x_fee
+            self.extra_fee_label.setVisible(True)
+            self.extra_fee_value.setVisible(True)
+            self.extra_fee_value.setText(self.main_window.format_amount_and_units(x_fee_amount))
+        amount = tx.output_value() if self.output_value == '!' else self.output_value
+        tx_size = tx.estimated_size()
+        fee_warning_tuple = self.wallet.get_tx_fee_warning(
+            invoice_amt=amount, tx_size=tx_size, fee=fee)
+        if fee_warning_tuple:
+            allow_send, long_warning, short_warning = fee_warning_tuple
+            self.toggle_send_button(allow_send, message=long_warning)
+        else:
+            self.toggle_send_button(True)
+
+    def _update_amount_label(self):
+        pass
+
+class ConfirmTxDialog(TxEditor):
+    help_text = ''#_('Set the mining fee of your transaction')
+
+    def __init__(self, *, window: 'ElectrumWindow', make_tx, output_value: Union[int, str], allow_preview=True):
+
+        TxEditor.__init__(
+            self,
+            window=window,
+            make_tx=make_tx,
+            output_value=output_value,
+            title=_("New Transaction"), # todo: adapt title for channel funding tx, swaps
+            allow_preview=allow_preview)
+
+        BlockingWaitingDialog(window, _("Preparing transaction..."), self.update_tx)
+        self.update()
+
+    def _update_amount_label(self):
+        tx = self.tx
+        if self.output_value == '!':
+            if tx:
+                amount = tx.output_value()
+                amount_str = self.main_window.format_amount_and_units(amount)
+            else:
+                amount_str = "max"
+        else:
+            amount = self.output_value
+            amount_str = self.main_window.format_amount_and_units(amount)
+        self.amount_label.setText(amount_str)
 
     def update_tx(self, *, fallback_to_zero_fee: bool = False):
         fee_estimator = self.get_fee_estimator()
@@ -116,6 +550,7 @@ class TxEditor:
         self.tx.set_rbf(True)
 
     def have_enough_funds_assuming_zero_fees(self) -> bool:
+        # called in send_tab.py
         try:
             tx = self.make_tx(0)
         except NotEnoughFunds:
@@ -123,147 +558,39 @@ class TxEditor:
         else:
             return True
 
-
-
-
-class ConfirmTxDialog(TxEditor, WindowModalDialog):
-    # set fee and return password (after pw check)
-
-    def __init__(self, *, window: 'ElectrumWindow', make_tx, output_value: Union[int, str], is_sweep: bool):
-
-        TxEditor.__init__(self, window=window, make_tx=make_tx, output_value=output_value, is_sweep=is_sweep)
-        WindowModalDialog.__init__(self, window, _("Confirm Transaction"))
-        vbox = QVBoxLayout()
-        self.setLayout(vbox)
+    def create_grid(self):
         grid = QGridLayout()
-        vbox.addLayout(grid)
-
         msg = (_('The amount to be received by the recipient.') + ' '
                + _('Fees are paid by the sender.'))
         self.amount_label = QLabel('')
         self.amount_label.setTextInteractionFlags(Qt.TextSelectableByMouse)
+
         grid.addWidget(HelpLabel(_("Amount to be sent") + ": ", msg), 0, 0)
         grid.addWidget(self.amount_label, 0, 1)
 
         msg = _('Bitcoin transactions are in general not free. A transaction fee is paid by the sender of the funds.') + '\n\n'\
               + _('The amount of fee can be decided freely by the sender. However, transactions with low fees take more time to be processed.') + '\n\n'\
               + _('A suggested fee is automatically added to this field. You may override it. The suggested fee increases with the size of the transaction.')
-        self.fee_label = QLabel('')
-        self.fee_label.setTextInteractionFlags(Qt.TextSelectableByMouse)
-        grid.addWidget(HelpLabel(_("Mining fee") + ": ", msg), 1, 0)
-        grid.addWidget(self.fee_label, 1, 1)
 
+        grid.addWidget(HelpLabel(_("Mining Fee") + ": ", msg), 1, 0)
+        grid.addLayout(self.fee_hbox, 1, 1, 1, 3)
+
+        grid.addWidget(HelpLabel(_("Fee target") + ": ", self.fee_combo.help_msg), 3, 0)
+        grid.addLayout(self.fee_target_hbox, 3, 1, 1, 3)
+
+        grid.setColumnStretch(4, 1)
+
+        # extra fee
         self.extra_fee_label = QLabel(_("Additional fees") + ": ")
         self.extra_fee_label.setVisible(False)
         self.extra_fee_value = QLabel('')
         self.extra_fee_value.setTextInteractionFlags(Qt.TextSelectableByMouse)
         self.extra_fee_value.setVisible(False)
-        grid.addWidget(self.extra_fee_label, 2, 0)
-        grid.addWidget(self.extra_fee_value, 2, 1)
-
-        self.fee_slider = FeeSlider(self, self.config, self.fee_slider_callback)
-        self.fee_combo = FeeComboBox(self.fee_slider)
-        grid.addWidget(HelpLabel(_("Fee rate") + ": ", self.fee_combo.help_msg), 5, 0)
-        grid.addWidget(self.fee_slider, 5, 1)
-        grid.addWidget(self.fee_combo, 5, 2)
-
-        self.message_label = WWLabel(self.default_message())
-        grid.addWidget(self.message_label, 6, 0, 1, -1)
-        self.pw_label = QLabel(_('Password'))
-        self.pw_label.setVisible(self.password_required)
-        self.pw = PasswordLineEdit()
-        self.pw.setVisible(self.password_required)
-        grid.addWidget(self.pw_label, 8, 0)
-        grid.addWidget(self.pw, 8, 1, 1, -1)
-        self.preview_button = QPushButton(_('Advanced'))
-        self.preview_button.clicked.connect(self.on_preview)
-        grid.addWidget(self.preview_button, 0, 2)
-        self.send_button = QPushButton(_('Send'))
-        self.send_button.clicked.connect(self.on_send)
-        self.send_button.setDefault(True)
-        vbox.addLayout(Buttons(CancelButton(self), self.send_button))
-        BlockingWaitingDialog(window, _("Preparing transaction..."), self.update_tx)
-        self.update()
-        self.is_send = False
+        grid.addWidget(self.extra_fee_label, 5, 0)
+        grid.addWidget(self.extra_fee_value, 5, 1)
 
-    def default_message(self):
-        return _('Enter your password to proceed') if self.password_required else _('Click Send to proceed')
+        # locktime editor
+        grid.addWidget(self.locktime_label, 6, 0)
+        grid.addWidget(self.locktime_e, 6, 1, 1, 2)
 
-    def on_preview(self):
-        self.accept()
-
-    def run(self):
-        cancelled = not self.exec_()
-        password = self.pw.text() or None
-        self.stop_editor_updates()
-        self.deleteLater()  # see #3956
-        return cancelled, self.is_send, password, self.tx
-
-    def on_send(self):
-        password = self.pw.text() or None
-        if self.password_required:
-            if password is None:
-                self.main_window.show_error(_("Password required"), parent=self)
-                return
-            try:
-                self.wallet.check_password(password)
-            except Exception as e:
-                self.main_window.show_error(str(e), parent=self)
-                return
-        self.is_send = True
-        self.accept()
-
-    def toggle_send_button(self, enable: bool, *, message: str = None):
-        if message is None:
-            self.message_label.setStyleSheet(None)
-            self.message_label.setText(self.default_message())
-        else:
-            self.message_label.setStyleSheet(ColorScheme.RED.as_stylesheet())
-            self.message_label.setText(message)
-        self.pw.setEnabled(enable)
-        self.send_button.setEnabled(enable)
-
-    def _update_amount_label(self):
-        tx = self.tx
-        if self.output_value == '!':
-            if tx:
-                amount = tx.output_value()
-                amount_str = self.main_window.format_amount_and_units(amount)
-            else:
-                amount_str = "max"
-        else:
-            amount = self.output_value
-            amount_str = self.main_window.format_amount_and_units(amount)
-        self.amount_label.setText(amount_str)
-
-    def update(self):
-        tx = self.tx
-        self._update_amount_label()
-
-        if self.not_enough_funds:
-            text = self.main_window.send_tab.get_text_not_enough_funds_mentioning_frozen()
-            self.toggle_send_button(False, message=text)
-            return
-
-        if not tx:
-            return
-
-        fee = tx.get_fee()
-        assert fee is not None
-        self.fee_label.setText(self.main_window.format_amount_and_units(fee))
-        x_fee = run_hook('get_tx_extra_fee', self.wallet, tx)
-        if x_fee:
-            x_fee_address, x_fee_amount = x_fee
-            self.extra_fee_label.setVisible(True)
-            self.extra_fee_value.setVisible(True)
-            self.extra_fee_value.setText(self.main_window.format_amount_and_units(x_fee_amount))
-
-        amount = tx.output_value() if self.output_value == '!' else self.output_value
-        tx_size = tx.estimated_size()
-        fee_warning_tuple = self.wallet.get_tx_fee_warning(
-            invoice_amt=amount, tx_size=tx_size, fee=fee)
-        if fee_warning_tuple:
-            allow_send, long_warning, short_warning = fee_warning_tuple
-            self.toggle_send_button(allow_send, message=long_warning)
-        else:
-            self.toggle_send_button(True)
+        return grid

electrum/gui/qt/fee_slider.py

@@ -40,13 +40,18 @@ class FeeSlider(QSlider):
         self.update()
         self.valueChanged.connect(self.moved)
         self._active = True
+        self.setFocusPolicy(Qt.NoFocus)
+
+    def get_fee_rate(self, pos):
+        if self.dyn:
+            fee_rate = self.config.depth_to_fee(pos) if self.config.use_mempool_fees() else self.config.eta_to_fee(pos)
+        else:
+            fee_rate = self.config.static_fee(pos)
+        return fee_rate
 
     def moved(self, pos):
         with self.lock:
-            if self.dyn:
-                fee_rate = self.config.depth_to_fee(pos) if self.config.use_mempool_fees() else self.config.eta_to_fee(pos)
-            else:
-                fee_rate = self.config.static_fee(pos)
+            fee_rate = self.get_fee_rate(pos)
             tooltip = self.get_tooltip(pos, fee_rate)
             QToolTip.showText(QCursor.pos(), tooltip, self)
             self.setToolTip(tooltip)
@@ -60,6 +65,15 @@ class FeeSlider(QSlider):
         else:
             return _('Fixed rate') + ': ' + target + '\n' + _('Estimate') + ': ' + estimate
 
+    def get_dynfee_target(self):
+        if not self.dyn:
+            return ''
+        pos = self.value()
+        fee_rate = self.get_fee_rate(pos)
+        mempool = self.config.use_mempool_fees()
+        target, estimate = self.config.get_fee_text(pos, True, mempool, fee_rate)
+        return target
+
     def update(self):
         with self.lock:
             self.dyn = self.config.is_dynfee()

electrum/gui/qt/main_window.py

@@ -1258,17 +1258,16 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, Logger, QtEventListener):
             msg = messages.MGS_CONFLICTING_BACKUP_INSTANCE
             if not self.question(msg):
                 return
-        # use ConfirmTxDialog
         # we need to know the fee before we broadcast, because the txid is required
         make_tx = self.mktx_for_open_channel(funding_sat=funding_sat, node_id=node_id)
-        d = ConfirmTxDialog(window=self, make_tx=make_tx, output_value=funding_sat, is_sweep=False)
-        # disable preview button because the user must not broadcast tx before establishment_flow
-        d.preview_button.setEnabled(False)
-        cancelled, is_send, password, funding_tx = d.run()
-        if not is_send:
-            return
-        if cancelled:
+        d = ConfirmTxDialog(window=self, make_tx=make_tx, output_value=funding_sat, allow_preview=False)
+        funding_tx = d.run()
+        if not funding_tx:
             return
+        self._open_channel(connect_str, funding_sat, push_amt, funding_tx)
+
+    @protected
+    def _open_channel(self, connect_str, funding_sat, push_amt, funding_tx, password):
         # read funding_sat from tx; converts '!' to int value
         funding_sat = funding_tx.output_value_for_address(ln_dummy_address())
         def task():

electrum/gui/qt/rbf_dialog.py

@@ -4,6 +4,7 @@
 
 from typing import TYPE_CHECKING
 
+from PyQt5.QtCore import Qt
 from PyQt5.QtWidgets import (QCheckBox, QLabel, QVBoxLayout, QGridLayout, QWidget,
                              QPushButton, QHBoxLayout, QComboBox)
 
@@ -20,7 +21,9 @@ if TYPE_CHECKING:
     from .main_window import ElectrumWindow
 
 
-class _BaseRBFDialog(WindowModalDialog):
+from .confirm_tx_dialog import ConfirmTxDialog, TxEditor, TxSizeLabel, HelpLabel
+
+class _BaseRBFDialog(TxEditor):
 
     def __init__(
             self,
@@ -30,125 +33,110 @@ class _BaseRBFDialog(WindowModalDialog):
             txid: str,
             title: str):
 
-        WindowModalDialog.__init__(self, main_window, title=title)
-        self.window = main_window
         self.wallet = main_window.wallet
-        self.tx = tx
-        self.new_tx = None
+        self.old_tx = tx
         assert txid
-        self.txid = txid
+        self.old_txid = txid
         self.message = ''
 
-        fee = tx.get_fee()
-        assert fee is not None
-        tx_size = tx.estimated_size()
-        self.old_fee_rate = old_fee_rate = fee / tx_size  # sat/vbyte
-        vbox = QVBoxLayout(self)
-        vbox.addWidget(WWLabel(self.help_text))
-        vbox.addStretch(1)
-
-        self.ok_button = OkButton(self)
-        self.message_label = QLabel('')
-        self.feerate_e = FeerateEdit(lambda: 0)
-        self.feerate_e.setAmount(max(old_fee_rate * 1.5, old_fee_rate + 1))
-        self.feerate_e.textChanged.connect(self.update)
-
-        def on_slider(dyn, pos, fee_rate):
-            fee_slider.activate()
-            if fee_rate is not None:
-                self.feerate_e.setAmount(fee_rate / 1000)
-
-        fee_slider = FeeSlider(self.window, self.window.config, on_slider)
-        fee_combo = FeeComboBox(fee_slider)
-        fee_slider.deactivate()
-        self.feerate_e.textEdited.connect(fee_slider.deactivate)
-
-        grid = QGridLayout()
+        self.old_fee = self.old_tx.get_fee()
+        self.old_tx_size = tx.estimated_size()
+        self.old_fee_rate = old_fee_rate = self.old_fee / self.old_tx_size  # sat/vbyte
 
-        self.method_label = QLabel(_('Method') + ':')
-        self.method_combo = QComboBox()
-        self.method_combo.addItems([_('Preserve payment'), _('Decrease payment')])
-        self.method_combo.currentIndexChanged.connect(self.update)
-        grid.addWidget(self.method_label, 0, 0)
-        grid.addWidget(self.method_combo, 0, 1)
+        TxEditor.__init__(
+            self,
+            window=main_window,
+            title=title,
+            make_tx=self.rbf_func)
 
-        grid.addWidget(QLabel(_('Current fee') + ':'), 1, 0)
-        grid.addWidget(QLabel(self.window.format_amount_and_units(fee)), 1, 1)
-        grid.addWidget(QLabel(_('Current fee rate') + ':'), 2, 0)
-        grid.addWidget(QLabel(self.window.format_fee_rate(1000 * old_fee_rate)), 2, 1)
-
-        grid.addWidget(QLabel(_('New fee rate') + ':'), 3, 0)
-        grid.addWidget(self.feerate_e, 3, 1)
-        grid.addWidget(fee_slider, 3, 2)
-        grid.addWidget(fee_combo, 3, 3)
-        grid.addWidget(self.message_label, 5, 0, 1, 3)
-
-        vbox.addLayout(grid)
-        vbox.addStretch(1)
-        btns_hbox = QHBoxLayout()
-        btns_hbox.addStretch(1)
-        btns_hbox.addWidget(CancelButton(self))
-        btns_hbox.addWidget(self.ok_button)
-        vbox.addLayout(btns_hbox)
-
-        new_fee_rate = old_fee_rate + max(1, old_fee_rate // 20)
+        new_fee_rate = self.old_fee_rate + max(1, self.old_fee_rate // 20)
         self.feerate_e.setAmount(new_fee_rate)
         self._update_tx(new_fee_rate)
         self._update_message()
-        # give focus to fee slider
-        fee_slider.activate()
-        fee_slider.setFocus()
+        self.fee_slider.activate()
         # are we paying max?
         invoices = self.wallet.get_relevant_invoices_for_tx(txid)
         if len(invoices) == 1 and len(invoices[0].outputs) == 1:
             if invoices[0].outputs[0].value == '!':
                 self.set_decrease_payment()
 
+    def create_grid(self):
+        self.method_label = QLabel(_('Method') + ':')
+        self.method_combo = QComboBox()
+        self.method_combo.addItems([_('Preserve payment'), _('Decrease payment')])
+        self.method_combo.currentIndexChanged.connect(self.update)
+        old_size_label = TxSizeLabel()
+        old_size_label.setAlignment(Qt.AlignCenter)
+        old_size_label.setAmount(self.old_tx_size)
+        old_size_label.setStyleSheet(ColorScheme.DEFAULT.as_stylesheet())
+        current_fee_hbox = QHBoxLayout()
+        current_fee_hbox.addWidget(QLabel(self.main_window.format_fee_rate(1000 * self.old_fee_rate)))
+        current_fee_hbox.addWidget(old_size_label)
+        current_fee_hbox.addWidget(QLabel(self.main_window.format_amount_and_units(self.old_fee)))
+        current_fee_hbox.addStretch()
+        grid = QGridLayout()
+        grid.addWidget(self.method_label, 0, 0)
+        grid.addWidget(self.method_combo, 0, 1)
+        grid.addWidget(QLabel(_('Current fee') + ':'), 1, 0)
+        grid.addLayout(current_fee_hbox, 1, 1, 1, 3)
+        grid.addWidget(QLabel(_('New fee') + ':'), 2, 0)
+        grid.addLayout(self.fee_hbox, 2, 1, 1, 3)
+        grid.addWidget(HelpLabel(_("Fee target") + ": ", self.fee_combo.help_msg), 4, 0)
+        grid.addLayout(self.fee_target_hbox, 4, 1, 1, 3)
+        grid.setColumnStretch(4, 1)
+        # locktime
+        grid.addWidget(self.locktime_label, 5, 0)
+        grid.addWidget(self.locktime_e, 5, 1, 1, 2)
+        return grid
+
     def is_decrease_payment(self):
         return self.method_combo.currentIndex() == 1
 
     def set_decrease_payment(self):
         self.method_combo.setCurrentIndex(1)
 
-    def rbf_func(self, fee_rate) -> PartialTransaction:
-        raise NotImplementedError()  # implemented by subclasses
-
     def run(self) -> None:
         if not self.exec_():
             return
-        self.new_tx.set_rbf(True)
-        tx_label = self.wallet.get_label_for_txid(self.txid)
-        self.window.show_transaction(self.new_tx, tx_desc=tx_label)
-        # TODO maybe save tx_label as label for new tx??
-
-    def update(self):
+        if self.is_preview:
+            self.main_window.show_transaction(self.tx)
+            return
+        def sign_done(success):
+            if success:
+                self.main_window.broadcast_or_show(self.tx)
+        self.main_window.sign_tx(
+            self.tx,
+            callback=sign_done,
+            external_keypairs={})
+
+    def update_tx(self):
         fee_rate = self.feerate_e.get_amount()
         self._update_tx(fee_rate)
         self._update_message()
 
     def _update_tx(self, fee_rate):
         if fee_rate is None:
-            self.new_tx = None
+            self.tx = None
             self.message = ''
         elif fee_rate <= self.old_fee_rate:
-            self.new_tx = None
+            self.tx = None
             self.message = _("The new fee rate needs to be higher than the old fee rate.")
         else:
             try:
-                self.new_tx = self.rbf_func(fee_rate)
+                self.tx = self.make_tx(fee_rate)
             except CannotBumpFee as e:
-                self.new_tx = None
+                self.tx = None
                 self.message = str(e)
-        if not self.new_tx:
+        if not self.tx:
             return
-        delta = self.new_tx.get_fee() - self.tx.get_fee()
+        delta = self.tx.get_fee() - self.old_tx.get_fee()
         if not self.is_decrease_payment():
-            self.message = _("You will pay {} more.").format(self.window.format_amount_and_units(delta))
+            self.message = _("You will pay {} more.").format(self.main_window.format_amount_and_units(delta))
         else:
-            self.message = _("The recipient will receive {} less.").format(self.window.format_amount_and_units(delta))
+            self.message = _("The recipient will receive {} less.").format(self.main_window.format_amount_and_units(delta))
 
     def _update_message(self):
-        enabled = bool(self.new_tx)
+        enabled = bool(self.tx)
         self.ok_button.setEnabled(enabled)
         if enabled:
             style = ColorScheme.BLUE.as_stylesheet()
@@ -177,10 +165,10 @@ class BumpFeeDialog(_BaseRBFDialog):
 
     def rbf_func(self, fee_rate):
         return self.wallet.bump_fee(
-            tx=self.tx,
-            txid=self.txid,
+            tx=self.old_tx,
+            txid=self.old_txid,
             new_fee_rate=fee_rate,
-            coins=self.window.get_coins(),
+            coins=self.main_window.get_coins(),
             decrease_payment=self.is_decrease_payment())
 
 
@@ -206,4 +194,4 @@ class DSCancelDialog(_BaseRBFDialog):
         self.method_combo.setVisible(False)
 
     def rbf_func(self, fee_rate):
-        return self.wallet.dscancel(tx=self.tx, new_fee_rate=fee_rate)
+        return self.wallet.dscancel(tx=self.old_tx, new_fee_rate=fee_rate)

electrum/gui/qt/send_tab.py

@@ -28,7 +28,6 @@ from electrum.lnurl import decode_lnurl, request_lnurl, callback_lnurl, LNURLErr
 from .amountedit import AmountEdit, BTCAmountEdit, SizedFreezableLineEdit
 from .util import WaitingDialog, HelpLabel, MessageBoxMixin, EnterButton, char_width_in_lineedit
 from .confirm_tx_dialog import ConfirmTxDialog
-from .transaction_dialog import PreviewTxDialog
 
 if TYPE_CHECKING:
     from .main_window import ElectrumWindow
@@ -234,7 +233,7 @@ class SendTab(QWidget, MessageBoxMixin, Logger):
             output_value = '!'
         else:
             output_value = sum(output_values)
-        conf_dlg = ConfirmTxDialog(window=self.window, make_tx=make_tx, output_value=output_value, is_sweep=is_sweep)
+        conf_dlg = ConfirmTxDialog(window=self.window, make_tx=make_tx, output_value=output_value)
         if conf_dlg.not_enough_funds:
             # Check if we had enough funds excluding fees,
             # if so, still provide opportunity to set lower fees.
@@ -243,37 +242,26 @@ class SendTab(QWidget, MessageBoxMixin, Logger):
                 self.show_message(text)
                 return
 
-        # shortcut to advanced preview (after "enough funds" check!)
-        if self.config.get('advanced_preview'):
-            preview_dlg = PreviewTxDialog(
-                window=self.window,
-                make_tx=make_tx,
-                external_keypairs=external_keypairs,
-                output_value=output_value)
-            preview_dlg.show()
+        tx = conf_dlg.run()
+        if tx is None:
+            # user cancelled
             return
-
-        cancelled, is_send, password, tx = conf_dlg.run()
-        if cancelled:
+        is_preview = conf_dlg.is_preview
+        if is_preview:
+            self.window.show_transaction(tx)
             return
-        if is_send:
-            self.save_pending_invoice()
-            def sign_done(success):
-                if success:
-                    self.window.broadcast_or_show(tx)
-            self.window.sign_tx_with_password(
-                tx,
-                callback=sign_done,
-                password=password,
-                external_keypairs=external_keypairs,
-            )
-        else:
-            preview_dlg = PreviewTxDialog(
-                window=self.window,
-                make_tx=make_tx,
-                external_keypairs=external_keypairs,
-                output_value=output_value)
-            preview_dlg.show()
+
+        self.save_pending_invoice()
+        def sign_done(success):
+            if success:
+                self.window.broadcast_or_show(tx)
+            else:
+                raise
+
+        self.window.sign_tx(
+            tx,
+            callback=sign_done,
+            external_keypairs=external_keypairs)
 
     def get_text_not_enough_funds_mentioning_frozen(self) -> str:
         text = _("Not enough funds")

electrum/gui/qt/settings_dialog.py

@@ -276,13 +276,6 @@ class SettingsDialog(QDialog, QtEventListener):
         filelogging_cb.stateChanged.connect(on_set_filelogging)
         filelogging_cb.setToolTip(_('Debug logs can be persisted to disk. These are useful for troubleshooting.'))
 
-        preview_cb = QCheckBox(_('Advanced preview'))
-        preview_cb.setChecked(bool(self.config.get('advanced_preview', False)))
-        preview_cb.setToolTip(_("Open advanced transaction preview dialog when 'Pay' is clicked."))
-        def on_preview(x):
-            self.config.set_key('advanced_preview', x == Qt.Checked)
-        preview_cb.stateChanged.connect(on_preview)
-
         usechange_cb = QCheckBox(_('Use change addresses'))
         usechange_cb.setChecked(self.wallet.use_change)
         if not self.config.is_modifiable('use_change'): usechange_cb.setEnabled(False)
@@ -494,7 +487,6 @@ class SettingsDialog(QDialog, QtEventListener):
         tx_widgets = []
         tx_widgets.append((usechange_cb, None))
         tx_widgets.append((batch_rbf_cb, None))
-        tx_widgets.append((preview_cb, None))
         tx_widgets.append((unconf_cb, None))
         tx_widgets.append((multiple_cb, None))
         tx_widgets.append((outrounding_cb, None))

electrum/gui/qt/transaction_dialog.py

@@ -43,6 +43,7 @@ from qrcode import exceptions
 from electrum.simple_config import SimpleConfig
 from electrum.util import quantize_feerate
 from electrum import bitcoin
+
 from electrum.bitcoin import base_encode, NLOCKTIME_BLOCKHEIGHT_MAX
 from electrum.i18n import _
 from electrum.plugin import run_hook
@@ -59,10 +60,6 @@ from .util import (MessageBoxMixin, read_QIcon, Buttons, icon_path,
                    BlockingWaitingDialog, getSaveFileName, ColorSchemeItem,
                    get_iconname_qrcode)
 
-from .fee_slider import FeeSlider, FeeComboBox
-from .confirm_tx_dialog import TxEditor
-from .amountedit import FeerateEdit, BTCAmountEdit
-from .locktimeedit import LockTimeEdit
 
 if TYPE_CHECKING:
     from .main_window import ElectrumWindow
@@ -353,6 +350,7 @@ class TxInOutWidget(QWidget):
         menu.exec_(global_pos)
 
 
+
 def show_transaction(tx: Transaction, *, parent: 'ElectrumWindow', desc=None, prompt_if_unsaved=False):
     try:
         d = TxDialog(tx, parent=parent, desc=desc, prompt_if_unsaved=prompt_if_unsaved)
@@ -428,9 +426,6 @@ class BaseTxDialog(QDialog, MessageBoxMixin):
         self.export_actions_button.setMenu(export_actions_menu)
         self.export_actions_button.setPopupMode(QToolButton.InstantPopup)
 
-        self.finalize_button = QPushButton(_('Finalize'))
-        self.finalize_button.clicked.connect(self.on_finalize)
-
         partial_tx_actions_menu = QMenu()
         ptx_merge_sigs_action = QAction(_("Merge signatures from"), self)
         ptx_merge_sigs_action.triggered.connect(self.merge_sigs)
@@ -447,11 +442,11 @@ class BaseTxDialog(QDialog, MessageBoxMixin):
         # Action buttons
         self.buttons = [self.partial_tx_actions_button, self.sign_button, self.broadcast_button, self.cancel_button]
         # Transaction sharing buttons
-        self.sharing_buttons = [self.finalize_button, self.export_actions_button, self.save_button]
+        self.sharing_buttons = [self.export_actions_button, self.save_button]
         run_hook('transaction_dialog', self)
-        if not self.finalized:
-            self.create_fee_controls()
-            vbox.addWidget(self.feecontrol_fields)
+        #if not self.finalized:
+        #    self.create_fee_controls()
+        #    vbox.addWidget(self.feecontrol_fields)
         self.hbox = hbox = QHBoxLayout()
         hbox.addLayout(Buttons(*self.sharing_buttons))
         hbox.addStretch(1)
@@ -464,8 +459,6 @@ class BaseTxDialog(QDialog, MessageBoxMixin):
     def set_buttons_visibility(self):
         for b in [self.export_actions_button, self.save_button, self.sign_button, self.broadcast_button, self.partial_tx_actions_button]:
             b.setVisible(self.finalized)
-        for b in [self.finalize_button]:
-            b.setVisible(not self.finalized)
 
     def set_tx(self, tx: 'Transaction'):
         # Take a copy; it might get updated in the main window by
@@ -659,9 +652,6 @@ class BaseTxDialog(QDialog, MessageBoxMixin):
         self.update()
 
     def update(self):
-        if not self.finalized:
-            self.update_fee_fields()
-            self.finalize_button.setEnabled(self.can_finalize())
         if self.tx is None:
             return
         self.io_widget.update(self.tx)
@@ -723,8 +713,7 @@ class BaseTxDialog(QDialog, MessageBoxMixin):
         else:
             locktime_final_str = f"LockTime: {self.tx.locktime} ({datetime.datetime.fromtimestamp(self.tx.locktime)})"
         self.locktime_final_label.setText(locktime_final_str)
-        if self.locktime_e.get_locktime() is None:
-            self.locktime_e.set_locktime(self.tx.locktime)
+
         self.rbf_label.setText(_('Replace by fee') + f": {not self.tx.is_final()}")
 
         if tx_mined_status.header_hash:
@@ -768,10 +757,7 @@ class BaseTxDialog(QDialog, MessageBoxMixin):
             fee_rate = Decimal(fee) / size  # sat/byte
             fee_str += '  ( %s ) ' % self.main_window.format_fee_rate(fee_rate * 1000)
             if isinstance(self.tx, PartialTransaction):
-                if isinstance(self, PreviewTxDialog):
-                    invoice_amt = self.tx.output_value() if self.output_value == '!' else self.output_value
-                else:
-                    invoice_amt = amount
+                invoice_amt = amount
                 fee_warning_tuple = self.wallet.get_tx_fee_warning(
                     invoice_amt=invoice_amt, tx_size=size, fee=fee)
                 if fee_warning_tuple:
@@ -865,19 +851,6 @@ class BaseTxDialog(QDialog, MessageBoxMixin):
         self.locktime_final_label = TxDetailLabel()
         vbox_right.addWidget(self.locktime_final_label)
 
-        locktime_setter_hbox = QHBoxLayout()
-        locktime_setter_hbox.setContentsMargins(0, 0, 0, 0)
-        locktime_setter_hbox.setSpacing(0)
-        locktime_setter_label = TxDetailLabel()
-        locktime_setter_label.setText("LockTime: ")
-        self.locktime_e = LockTimeEdit(self)
-        locktime_setter_hbox.addWidget(locktime_setter_label)
-        locktime_setter_hbox.addWidget(self.locktime_e)
-        locktime_setter_hbox.addStretch(1)
-        self.locktime_setter_widget = QWidget()
-        self.locktime_setter_widget.setLayout(locktime_setter_hbox)
-        vbox_right.addWidget(self.locktime_setter_widget)
-
         self.block_height_label = TxDetailLabel()
         vbox_right.addWidget(self.block_height_label)
         vbox_right.addStretch(1)
@@ -892,7 +865,6 @@ class BaseTxDialog(QDialog, MessageBoxMixin):
         # set visibility after parenting can be determined by Qt
         self.rbf_label.setVisible(self.finalized)
         self.locktime_final_label.setVisible(self.finalized)
-        self.locktime_setter_widget.setVisible(not self.finalized)
 
     def set_title(self):
         self.setWindowTitle(_("Create transaction") if not self.finalized else _("Transaction"))
@@ -947,228 +919,3 @@ class TxDialog(BaseTxDialog):
         self.update()
 
 
-class PreviewTxDialog(BaseTxDialog, TxEditor):
-
-    def __init__(
-            self,
-            *,
-            make_tx,
-            external_keypairs,
-            window: 'ElectrumWindow',
-            output_value: Union[int, str],
-    ):
-        TxEditor.__init__(
-            self,
-            window=window,
-            make_tx=make_tx,
-            is_sweep=bool(external_keypairs),
-            output_value=output_value,
-        )
-        BaseTxDialog.__init__(self, parent=window, desc='', prompt_if_unsaved=False,
-                              finalized=False, external_keypairs=external_keypairs)
-        BlockingWaitingDialog(window, _("Preparing transaction..."),
-                              lambda: self.update_tx(fallback_to_zero_fee=True))
-        self.update()
-
-    def create_fee_controls(self):
-
-        self.size_e = TxSizeLabel()
-        self.size_e.setAlignment(Qt.AlignCenter)
-        self.size_e.setAmount(0)
-        self.size_e.setStyleSheet(ColorScheme.DEFAULT.as_stylesheet())
-
-        self.fiat_fee_label = TxFiatLabel()
-        self.fiat_fee_label.setAlignment(Qt.AlignCenter)
-        self.fiat_fee_label.setAmount(0)
-        self.fiat_fee_label.setStyleSheet(ColorScheme.DEFAULT.as_stylesheet())
-
-        self.feerate_e = FeerateEdit(lambda: 0)
-        self.feerate_e.setAmount(self.config.fee_per_byte())
-        self.feerate_e.textEdited.connect(partial(self.on_fee_or_feerate, self.feerate_e, False))
-        self.feerate_e.editingFinished.connect(partial(self.on_fee_or_feerate, self.feerate_e, True))
-
-        self.fee_e = BTCAmountEdit(self.main_window.get_decimal_point)
-        self.fee_e.textEdited.connect(partial(self.on_fee_or_feerate, self.fee_e, False))
-        self.fee_e.editingFinished.connect(partial(self.on_fee_or_feerate, self.fee_e, True))
-
-        self.fee_e.textChanged.connect(self.entry_changed)
-        self.feerate_e.textChanged.connect(self.entry_changed)
-
-        self.fee_slider = FeeSlider(self, self.config, self.fee_slider_callback)
-        self.fee_combo = FeeComboBox(self.fee_slider)
-        self.fee_slider.setFixedWidth(self.fee_e.width())
-
-        def feerounding_onclick():
-            text = (self.feerounding_text + '\n\n' +
-                    _('To somewhat protect your privacy, Electrum tries to create change with similar precision to other outputs.') + ' ' +
-                    _('At most 100 satoshis might be lost due to this rounding.') + ' ' +
-                    _("You can disable this setting in '{}'.").format(_('Preferences')) + '\n' +
-                    _('Also, dust is not kept as change, but added to the fee.')  + '\n' +
-                    _('Also, when batching RBF transactions, BIP 125 imposes a lower bound on the fee.'))
-            self.show_message(title=_('Fee rounding'), msg=text)
-
-        self.feerounding_icon = QToolButton()
-        self.feerounding_icon.setIcon(read_QIcon('info.png'))
-        self.feerounding_icon.setAutoRaise(True)
-        self.feerounding_icon.clicked.connect(feerounding_onclick)
-        self.feerounding_icon.setVisible(False)
-
-        self.feecontrol_fields = QWidget()
-        hbox = QHBoxLayout(self.feecontrol_fields)
-        hbox.setContentsMargins(0, 0, 0, 0)
-        grid = QGridLayout()
-        grid.addWidget(QLabel(_("Target fee:")), 0, 0)
-        grid.addWidget(self.feerate_e, 0, 1)
-        grid.addWidget(self.size_e, 0, 2)
-        grid.addWidget(self.fee_e, 0, 3)
-        grid.addWidget(self.feerounding_icon, 0, 4)
-        grid.addWidget(self.fiat_fee_label, 0, 5)
-        grid.addWidget(self.fee_slider, 1, 1)
-        grid.addWidget(self.fee_combo, 1, 2)
-        hbox.addLayout(grid)
-        hbox.addStretch(1)
-
-    def fee_slider_callback(self, dyn, pos, fee_rate):
-        super().fee_slider_callback(dyn, pos, fee_rate)
-        self.fee_slider.activate()
-        if fee_rate:
-            fee_rate = Decimal(fee_rate)
-            self.feerate_e.setAmount(quantize_feerate(fee_rate / 1000))
-        else:
-            self.feerate_e.setAmount(None)
-        self.fee_e.setModified(False)
-
-    def on_fee_or_feerate(self, edit_changed, editing_finished):
-        edit_other = self.feerate_e if edit_changed == self.fee_e else self.fee_e
-        if editing_finished:
-            if edit_changed.get_amount() is None:
-                # This is so that when the user blanks the fee and moves on,
-                # we go back to auto-calculate mode and put a fee back.
-                edit_changed.setModified(False)
-        else:
-            # edit_changed was edited just now, so make sure we will
-            # freeze the correct fee setting (this)
-            edit_other.setModified(False)
-        self.fee_slider.deactivate()
-        self.update()
-
-    def is_send_fee_frozen(self):
-        return self.fee_e.isVisible() and self.fee_e.isModified() \
-               and (self.fee_e.text() or self.fee_e.hasFocus())
-
-    def is_send_feerate_frozen(self):
-        return self.feerate_e.isVisible() and self.feerate_e.isModified() \
-               and (self.feerate_e.text() or self.feerate_e.hasFocus())
-
-    def set_feerounding_text(self, num_satoshis_added):
-        self.feerounding_text = (_('Additional {} satoshis are going to be added.')
-                                 .format(num_satoshis_added))
-
-    def get_fee_estimator(self):
-        if self.is_send_fee_frozen() and self.fee_e.get_amount() is not None:
-            fee_estimator = self.fee_e.get_amount()
-        elif self.is_send_feerate_frozen() and self.feerate_e.get_amount() is not None:
-            amount = self.feerate_e.get_amount()  # sat/byte feerate
-            amount = 0 if amount is None else amount * 1000  # sat/kilobyte feerate
-            fee_estimator = partial(
-                SimpleConfig.estimate_fee_for_feerate, amount)
-        else:
-            fee_estimator = None
-        return fee_estimator
-
-    def entry_changed(self):
-        # blue color denotes auto-filled values
-        text = ""
-        fee_color = ColorScheme.DEFAULT
-        feerate_color = ColorScheme.DEFAULT
-        if self.not_enough_funds:
-            fee_color = ColorScheme.RED
-            feerate_color = ColorScheme.RED
-        elif self.fee_e.isModified():
-            feerate_color = ColorScheme.BLUE
-        elif self.feerate_e.isModified():
-            fee_color = ColorScheme.BLUE
-        else:
-            fee_color = ColorScheme.BLUE
-            feerate_color = ColorScheme.BLUE
-        self.fee_e.setStyleSheet(fee_color.as_stylesheet())
-        self.feerate_e.setStyleSheet(feerate_color.as_stylesheet())
-        #
-        self.needs_update = True
-
-    def update_fee_fields(self):
-        freeze_fee = self.is_send_fee_frozen()
-        freeze_feerate = self.is_send_feerate_frozen()
-        tx = self.tx
-        if self.no_dynfee_estimates and tx:
-            size = tx.estimated_size()
-            self.size_e.setAmount(size)
-        if self.not_enough_funds or self.no_dynfee_estimates:
-            if not freeze_fee:
-                self.fee_e.setAmount(None)
-            if not freeze_feerate:
-                self.feerate_e.setAmount(None)
-            self.feerounding_icon.setVisible(False)
-            return
-
-        assert tx is not None
-        size = tx.estimated_size()
-        fee = tx.get_fee()
-
-        self.size_e.setAmount(size)
-        fiat_fee = self.main_window.format_fiat_and_units(fee)
-        self.fiat_fee_label.setAmount(fiat_fee)
-
-        # Displayed fee/fee_rate values are set according to user input.
-        # Due to rounding or dropping dust in CoinChooser,
-        # actual fees often differ somewhat.
-        if freeze_feerate or self.fee_slider.is_active():
-            displayed_feerate = self.feerate_e.get_amount()
-            if displayed_feerate is not None:
-                displayed_feerate = quantize_feerate(displayed_feerate)
-            elif self.fee_slider.is_active():
-                # fallback to actual fee
-                displayed_feerate = quantize_feerate(fee / size) if fee is not None else None
-                self.feerate_e.setAmount(displayed_feerate)
-            displayed_fee = round(displayed_feerate * size) if displayed_feerate is not None else None
-            self.fee_e.setAmount(displayed_fee)
-        else:
-            if freeze_fee:
-                displayed_fee = self.fee_e.get_amount()
-            else:
-                # fallback to actual fee if nothing is frozen
-                displayed_fee = fee
-                self.fee_e.setAmount(displayed_fee)
-            displayed_fee = displayed_fee if displayed_fee else 0
-            displayed_feerate = quantize_feerate(displayed_fee / size) if displayed_fee is not None else None
-            self.feerate_e.setAmount(displayed_feerate)
-
-        # show/hide fee rounding icon
-        feerounding = (fee - displayed_fee) if (fee and displayed_fee is not None) else 0
-        self.set_feerounding_text(int(feerounding))
-        self.feerounding_icon.setToolTip(self.feerounding_text)
-        self.feerounding_icon.setVisible(abs(feerounding) >= 1)
-
-    def can_finalize(self):
-        return (self.tx is not None
-                and not self.not_enough_funds)
-
-    def on_finalize(self):
-        if not self.can_finalize():
-            return
-        assert self.tx
-        self.finalized = True
-        self.stop_editor_updates()
-        self.tx.set_rbf(True)
-        locktime = self.locktime_e.get_locktime()
-        if locktime is not None:
-            self.tx.locktime = locktime
-        for widget in [self.fee_slider, self.fee_combo, self.feecontrol_fields,
-                       self.locktime_setter_widget, self.locktime_e]:
-            widget.setEnabled(False)
-            widget.setVisible(False)
-        for widget in [self.rbf_label, self.locktime_final_label]:
-            widget.setVisible(True)
-        self.set_title()
-        self.set_buttons_visibility()
-        self.update()

electrum/wallet.py

@@ -2770,7 +2770,7 @@ class Abstract_Wallet(ABC, Logger, EventListener):
             fee: int) -> Optional[Tuple[bool, str, str]]:
 
         feerate = Decimal(fee) / tx_size  # sat/byte
-        fee_ratio = Decimal(fee) / invoice_amt if invoice_amt else 1
+        fee_ratio = Decimal(fee) / invoice_amt if invoice_amt else 0
         long_warning = None
         short_warning = None
         allow_send = True