Merge pull request #208 from CanonicalLtd/mwhudson/confirmation-dialog

confirm before writing data to disks

subiquity/ui/views/filesystem/filesystem.py

@@ -20,12 +20,21 @@ configuration.
 
 """
 import logging
-from urwid import connect_signal, Text
+from urwid import (
+    connect_signal,
+    LineBox,
+    Padding as UrwidPadding,
+    Text,
+    WidgetWrap,
+    )
 
-from subiquitycore.ui.buttons import (done_btn,
-                                      reset_btn,
-                                      cancel_btn,
-                                      menu_btn)
+from subiquitycore.ui.buttons import (
+    cancel_btn,
+    continue_btn,
+    done_btn,
+    menu_btn,
+    reset_btn,
+    )
 from subiquitycore.ui.container import Columns, ListBox, Pile
 from subiquitycore.ui.utils import Padding, Color
 from subiquitycore.view import BaseView
@@ -36,6 +45,32 @@ from subiquity.models.filesystem import _humanize_size
 log = logging.getLogger('subiquity.ui.filesystem.filesystem')
 
 
+confirmation_text = """
+Selecting Continue below will result of the loss of data on the disks selected to be formatted.
+
+Are you sure you want to continue?
+"""
+
+class FilesystemConfirmationView(WidgetWrap):
+    def __init__(self, parent, controller):
+        self.parent = parent
+        self.controller = controller
+        pile = Pile([
+            UrwidPadding(Text(confirmation_text), left=2, right=2),
+            Padding.fixed_15(Color.button(cancel_btn(label="No", on_press=self.cancel))),
+            Padding.fixed_15(Color.button(continue_btn(on_press=self.ok))),
+            Text(""),
+            ])
+        lb = LineBox(pile, title="Confirm destructive action")
+        super().__init__(Padding.center_75(lb))
+
+    def ok(self, sender):
+        self.controller.finish()
+
+    def cancel(self, sender):
+        self.parent.remove_overlay()
+
+
 class FilesystemView(BaseView):
     def __init__(self, model, controller):
         log.debug('FileSystemView init start()')
@@ -175,4 +210,4 @@ class FilesystemView(BaseView):
         self.controller.reset()
 
     def done(self, button):
-        self.controller.finish()
+        self.show_overlay(FilesystemConfirmationView(self, self.controller))