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
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
|
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Markup;
using System.Windows.Shapes;
using Tango.Core.Threading;
namespace Tango.Touch.Controls
{
[ContentProperty(nameof(Content))]
public class TouchVirtualizedContentControl : Control
{
private LightTouchScrollViewer _scrollViewer;
private ContentPresenter _innerBorder;
private ActionTimer _updateTimer;
private Point _location;
private bool _loaded;
public UIElement Content
{
get { return (UIElement)GetValue(ContentProperty); }
set { SetValue(ContentProperty, value); }
}
public static readonly DependencyProperty ContentProperty =
DependencyProperty.Register("Content", typeof(UIElement), typeof(TouchVirtualizedContentControl), new PropertyMetadata(null));
static TouchVirtualizedContentControl()
{
DefaultStyleKeyProperty.OverrideMetadata(typeof(TouchVirtualizedContentControl), new FrameworkPropertyMetadata(typeof(TouchVirtualizedContentControl)));
}
public TouchVirtualizedContentControl()
{
_updateTimer = new ActionTimer(TimeSpan.FromMilliseconds(200));
Loaded += TouchVirtualizedContentControl_Loaded;
}
public override void OnApplyTemplate()
{
base.OnApplyTemplate();
_innerBorder = GetTemplateChild("PART_innerBorder") as ContentPresenter;
}
private void TouchVirtualizedContentControl_Loaded(object sender, System.Windows.RoutedEventArgs e)
{
_scrollViewer = this.FindAncestor<LightTouchScrollViewer>();
_scrollViewer.Scrolling += _scrollViewer_Scrolling;
_location = this.TranslatePoint(new Point(0, 0), _scrollViewer);
ApplyOptimization();
_loaded = true;
}
private void _scrollViewer_Scrolling(object sender, DoubleValueChangedEventArgs e)
{
if (_loaded)
{
//_updateTimer.ResetReplace(() =>
//{
// Dispatcher.BeginInvoke(new Action(() =>
// {
ApplyOptimization();
// }));
//});
}
}
private void ApplyOptimization()
{
//var _border_viewport = _scrollViewer.GetViewportBorder();
//if (_border_viewport.IsAncestorOf(this))
//{
// //Point relativeLocation = this.TranslatePoint(new Point(0, 0), _border_viewport);
// //Rect bounds = this.TransformToAncestor(_border_viewport).TransformBounds(new Rect(0.0, 0.0, this.ActualWidth, this.ActualHeight));
// //Rect rect = new Rect(0.0, 0.0, _border_viewport.ActualWidth, _border_viewport.ActualHeight);
// if (_location.Y > _scrollViewer.GetScrollPosition() && _location.Y < _scrollViewer.GetScrollPosition() + _border_viewport.ActualHeight)
// {
// if (_innerBorder.Visibility == Visibility.Hidden)
// {
// _innerBorder.Visibility = Visibility.Visible;
// }
// }
// else
// {
// if (_innerBorder.Visibility == Visibility.Visible)
// {
// _innerBorder.Visibility = Visibility.Hidden;
// }
// }
//}
}
}
}
|
