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
|
using System.Diagnostics;
using Xamarin.Forms.CustomAttributes;
using Xamarin.Forms.Internals;
#if UITEST
using Xamarin.UITest;
using NUnit.Framework;
#endif
namespace Xamarin.Forms.Controls.Issues
{
[Preserve(AllMembers = true)]
[Issue(IssueTracker.Bugzilla, 44955, "[WinRT/UWP] Setting Entry BackgroundColor via Behavior results in sticky unfocused background color", PlatformAffected.WinRT)]
public class Bugzilla44955 : TestContentPage
{
Entry _validationEntry;
protected override void Init()
{
_validationEntry = new Entry();
_validationEntry.Behaviors.Add(new NonEmptyStringValidator());
Content = new StackLayout
{
Children =
{
new Label
{
Text = "The first entry should have a red background only when it is empty, regardless of focus (due to an attached behavior). The second has a set background color, the third is default, and the last is default, but disabled."
},
_validationEntry,
new Entry
{
BackgroundColor = Color.MediumPurple
},
new Entry(),
new Entry
{
IsEnabled = false
},
new Button
{
Text = "Change background of first label to yellow",
Command = new Command(() => _validationEntry.BackgroundColor = Color.Yellow)
}
}
};
}
protected override void OnDisappearing()
{
base.OnDisappearing();
_validationEntry.Behaviors.Clear();
}
class NonEmptyStringValidator : Behavior<Entry>
{
protected override void OnAttachedTo(Entry bindable)
{
bindable.TextChanged += HandleTextChanged;
Validate(bindable, bindable.Text);
}
protected override void OnDetachingFrom(Entry bindable)
{
bindable.TextChanged -= HandleTextChanged;
}
void HandleTextChanged(object sender, TextChangedEventArgs e)
{
Validate((Entry)sender, e.NewTextValue);
}
void Validate(Entry entry, string text)
{
if (text == null)
entry.BackgroundColor = Color.Red;
else
entry.BackgroundColor = text.Trim() != "" ? Color.Default : Color.Red;
}
}
}
}
|
