keyboard shortcut to send all the coins in a wallet, with fee

gui/gui_classic.py

@@ -687,7 +687,8 @@ class ElectrumWindow(QMainWindow):
         grid.addWidget(self.amount_e, 3, 1, 1, 2)
         grid.addWidget(HelpButton(
                 _('Amount to be sent.') + '\n\n' \
-                    + _('The amount will be displayed in red if you do not have enough funds in your wallet. Note that if you have frozen some of your addresses, the available funds will be lower than your total balance.')), 3, 3)
+                    + _('The amount will be displayed in red if you do not have enough funds in your wallet. Note that if you have frozen some of your addresses, the available funds will be lower than your total balance.')
+                    + _('Keyboard shortcut: type "!" to send all your coins.')), 3, 3)
         
         self.fee_e = QLineEdit()
         grid.addWidget(QLabel(_('Fee')), 4, 0)
@@ -721,6 +722,16 @@ class ElectrumWindow(QMainWindow):
 
         def entry_changed( is_fee ):
             self.funds_error = False
+
+            if self.amount_e.text() == '!':
+                c, u = self.wallet.get_balance()
+                inputs, total, fee = self.wallet.choose_tx_inputs( c + u, 0 )
+                fee = self.wallet.estimated_fee(inputs)
+                amount = c + u - fee
+                self.amount_e.setText( str( Decimal( amount ) / 100000000 ) )
+                self.fee_e.setText( str( Decimal( fee ) / 100000000 ) )
+                return
+                
             amount = numbify(self.amount_e)
             fee = numbify(self.fee_e)
             if not is_fee: fee = None

lib/wallet.py

@@ -555,14 +555,8 @@ class Wallet:
             addr = item.get('address')
             v = item.get('value')
             total += v
-
             inputs.append( item )
-            if fixed_fee is None:
-                estimated_size =  len(inputs) * 180 + 80     # this assumes non-compressed keys
-                fee = self.fee * int(round(estimated_size/1024.))
-                if fee == 0: fee = self.fee
-            else:
-                fee = fixed_fee
+            fee = self.estimated_fee(inputs) if fixed_fee is None else fixed_fee
             if total >= amount + fee: break
         else:
             inputs = []
@@ -570,6 +564,12 @@ class Wallet:
         return inputs, total, fee
 
 
+    def estimated_fee(self, inputs):
+        estimated_size =  len(inputs) * 180 + 80     # this assumes non-compressed keys
+        fee = self.fee * int(round(estimated_size/1024.))
+        if fee == 0: fee = self.fee
+        return fee
+
 
     def add_tx_change( self, outputs, amount, fee, total, change_addr=None ):
         change_amount = total - ( amount + fee )