blob: 9847867c4a2df117307b6ad3c92379ee2b8371df (
plain)
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
|
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System;
#if __UNIFIED__
using UIKit;
#else
using MonoTouch.UIKit;
#endif
namespace Xamarin.Forms.Platform.iOS
{
public static class UIViewExtensions
{
public static IEnumerable<UIView> Descendants(this UIView self)
{
if (self.Subviews == null)
return Enumerable.Empty<UIView>();
return self.Subviews.Concat(self.Subviews.SelectMany(s => s.Descendants()));
}
public static SizeRequest GetSizeRequest(this UIView self, double widthConstraint, double heightConstraint, double minimumWidth = -1, double minimumHeight = -1)
{
var s = self.SizeThatFits(new SizeF((float)widthConstraint, (float)heightConstraint));
var request = new Size(s.Width == float.PositiveInfinity ? double.PositiveInfinity : s.Width, s.Height == float.PositiveInfinity ? double.PositiveInfinity : s.Height);
var minimum = new Size(minimumWidth < 0 ? request.Width : minimumWidth, minimumHeight < 0 ? request.Height : minimumHeight);
return new SizeRequest(request, minimum);
}
internal static T FindDescendantView<T>(this UIView view) where T : UIView
{
var queue = new Queue<UIView>();
queue.Enqueue(view);
while (queue.Count > 0)
{
var descendantView = queue.Dequeue();
var result = descendantView as T;
if (result != null)
return result;
for (var i = 0; i < descendantView.Subviews.Length; i++)
queue.Enqueue(descendantView.Subviews[i]);
}
return null;
}
internal static UIView FindFirstResponder(this UIView view)
{
if (view.IsFirstResponder)
return view;
foreach (var subView in view.Subviews)
{
var firstResponder = subView.FindFirstResponder();
if (firstResponder != null)
return firstResponder;
}
return null;
}
}
}
|
