ui-tutorial/AreYouEnabledView.py at master · humberry/ui-tutorial · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
# coding: utf-8

import console, speech, ui


class AreYouEnabledView(ui.View):
    def __init__(self):
        print("-" * 20)  # sheets are useful for seeing the console below them

    def did_load(self):
        self["user text"].begin_editing()  # place the focus on the field
        self.textfield_sensitive_buttons = "alert hud_alert popover print say".split()
        self.enable_buttons(False)
        self.set_actions()

    def enable_buttons(self, enabled=True):
        # method 1: traversing a list of view names
        for button_name in self.textfield_sensitive_buttons:
            self[button_name].enabled = enabled

    # CustomViews can not set self-based actions in the UI editor :-(
    def set_actions(self):
        # method 2: traversing all subviews
        for subview in self.subviews:
            if isinstance(subview, ui.TextField):
                subview.delegate = self
            elif isinstance(subview, ui.Button):
                if subview.name == "say hi":
                    # method 3: button-specific action methods
                    subview.action = self.say_hi
                else:
                    subview.action = self.button_pressed

    def textfield_did_change(self, textfield):
        # speech.say('change')  # uncomment to see how often this gets called
        self.enable_buttons(textfield.text != "")

    def say_hi(self, sender):
        speech.say("Hi!")

    def button_pressed(self, sender):
        user_text = self["user text"].text
        assert user_text  # buttons will not be enabled if there is no text
        # method 4: using sender.name to decide how to respond
        if sender.name == "alert":
            self.console_alert(user_text)
        elif sender.name == "hud_alert":
            self.console_hud_alert(user_text)
        elif sender.name == "popover":
            self.popover(user_text)
        elif sender.name == "print":
            print(user_text)
        elif sender.name == "say":
            speech.say(user_text)
        else:  # this should never happen!
            print("button_pressed({})".format(sender.name))
            assert False  # panic

    @ui.in_background
    def console_alert(self, msg):
        console.alert(msg, "console.alert")

    @ui.in_background
    def console_hud_alert(self, msg):
        console.hud_alert(msg)

    def popover(self, msg):
        textview = ui.TextView()
        textview.editable = False
        textview.font = ("AmericanTypewriter", 24)
        textview.alignment = ui.ALIGN_CENTER
        textview.text = msg
        pov = ui.View()
        pov.width = textview.width = 222
        pov.add_subview(textview)
        pov.present("popover")


# in the .pyui file, the "Custom View Class" must be set to AreYouEnabledView
view = ui.load_view()
view.present("sheet")