kiv: add option to delete a wallet

gui/kivy/uix/dialogs/wallets.py

@@ -28,31 +28,51 @@ Builder.load_string('''
         Widget
             size_hint_y: 0.1
         GridLayout:
-            cols: 2
+            cols: 3
             size_hint_y: 0.1
             Button:
+                id: open_button
                 size_hint: 0.1, None
                 height: '48dp'
-                text: _('Cancel')
+                text: _('New')
                 on_release:
                     popup.dismiss()
+                    root.new_wallet(app, wallet_selector.path)
             Button:
                 id: open_button
                 size_hint: 0.1, None
                 height: '48dp'
-                text: _('Open') if wallet_selector.selection else _('New Wallet')
+                text: _('Open')
+                disabled: not wallet_selector.selection
                 on_release:
                     popup.dismiss()
-                    root.new_wallet(app, wallet_selector.path)
+                    root.open_wallet(app)
+            Button:
+                id: open_button
+                size_hint: 0.1, None
+                height: '48dp'
+                text: _('Delete')
+                disabled: not wallet_selector.selection
+                on_release:
+                    popup.dismiss()
+                    root.delete_wallet(app)
 ''')
 
 class WalletDialog(Factory.Popup):
+
     def new_wallet(self, app, dirname):
         def cb(text):
             if text:
                 app.load_wallet_by_name(os.path.join(dirname, text))
-        if self.ids.wallet_selector.selection:
-            app.load_wallet_by_name(self.ids.wallet_selector.selection[0])
-        else:
-            d = LabelDialog(_('Enter wallet name'), '', cb)
-            d.open()
+        d = LabelDialog(_('Enter wallet name'), '', cb)
+        d.open()
+
+    def open_wallet(self, app):
+        app.load_wallet_by_name(self.ids.wallet_selector.selection[0])
+
+    def delete_wallet(self, app):
+        from question import Question
+        name = self.ids.wallet_selector.selection[0]
+        f = lambda: os.unlink(name)
+        d = Question(_('Delete wallet?') + '\n' + os.path.basename(name), f)
+        d.open()