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using System;
using System.Collections.Generic;
using System.Diagnostics;
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 System.Windows.Threading;
using Tango.Core.Threading;
namespace Tango.Touch.Controls
{
[ContentProperty(nameof(Content))]
public class TouchVirtualizedContentReplaceControl : Control
{
private LightTouchScrollViewer _scrollViewer;
private Border _innerBorder;
private ActionTimer _updateTimer;
private Point _location;
private bool _loaded;
private Image _replaceContent;
private FrameworkElement _element;
private INameScopeDictionary _parentNameScope;
public DataTemplate Content
{
get { return (DataTemplate)GetValue(ContentProperty); }
set { SetValue(ContentProperty, value); }
}
public static readonly DependencyProperty ContentProperty =
DependencyProperty.Register("Content", typeof(DataTemplate), typeof(TouchVirtualizedContentReplaceControl), new PropertyMetadata(null));
public bool CanMovePosition
{
get { return (bool)GetValue(CanMovePositionProperty); }
set { SetValue(CanMovePositionProperty, value); }
}
public static readonly DependencyProperty CanMovePositionProperty =
DependencyProperty.Register("CanMovePosition", typeof(bool), typeof(TouchVirtualizedContentReplaceControl), new PropertyMetadata(false));
public LightTouchDataGrid DataGrid
{
get { return (LightTouchDataGrid)GetValue(DataGridProperty); }
set { SetValue(DataGridProperty, value); }
}
public static readonly DependencyProperty DataGridProperty =
DependencyProperty.Register("DataGrid", typeof(LightTouchDataGrid), typeof(TouchVirtualizedContentReplaceControl), new PropertyMetadata(null));
public bool Disconnect
{
get { return (bool)GetValue(DisconnectProperty); }
set { SetValue(DisconnectProperty, value); }
}
public static readonly DependencyProperty DisconnectProperty =
DependencyProperty.Register("Disconnect", typeof(bool), typeof(TouchVirtualizedContentReplaceControl), new PropertyMetadata(true));
static TouchVirtualizedContentReplaceControl()
{
DefaultStyleKeyProperty.OverrideMetadata(typeof(TouchVirtualizedContentReplaceControl), new FrameworkPropertyMetadata(typeof(TouchVirtualizedContentReplaceControl)));
}
public TouchVirtualizedContentReplaceControl()
{
_replaceContent = new Image();
_updateTimer = new ActionTimer(TimeSpan.FromMilliseconds(100));
Loaded += TouchVirtualizedContentControl_Loaded;
}
public override void OnApplyTemplate()
{
base.OnApplyTemplate();
_innerBorder = GetTemplateChild("PART_innerBorder") as Border;
_innerBorder.Child = _replaceContent;
}
private void TouchVirtualizedContentControl_Loaded(object sender, System.Windows.RoutedEventArgs e)
{
_scrollViewer = this.FindAncestor<LightTouchScrollViewer>();
_scrollViewer.Scrolling += _scrollViewer_Scrolling;
_parentNameScope = NameScope.GetNameScope(this.FindAncestor<UserControl>()) as INameScopeDictionary;
if (DataGrid != null)
{
DataGrid.SortingChanged += DataGrid_SortingChanged;
DataGrid.FilterChanged += DataGrid_FilterChanged;
}
_location = this.TranslatePoint(new Point(0, 0), _scrollViewer.GetContentGrid());
_scrollViewer.GetContentGrid().SizeChanged += TouchVirtualizedContentControl_SizeChanged;
ApplyVirtualization();
_loaded = true;
}
private void DataGrid_FilterChanged(object sender, EventArgs e)
{
InvalidateVirtualization();
}
private void DataGrid_SortingChanged(object sender, EventArgs e)
{
InvalidateVirtualization();
}
private void TouchVirtualizedContentControl_SizeChanged(object sender, SizeChangedEventArgs e)
{
InvalidateVirtualization();
}
private void _scrollViewer_Scrolling(object sender, DoubleValueChangedEventArgs e)
{
if (_loaded)
{
ApplyVirtualization();
}
}
private void InvalidateVirtualization()
{
_updateTimer.ResetReplace(() =>
{
Dispatcher.Invoke(new Action(() =>
{
_location = this.TranslatePoint(new Point(0, 0), _scrollViewer.GetContentGrid());
ApplyVirtualization();
}));
});
}
private void ApplyVirtualization()
{
if (!Disconnect && _element != null)
{
_updateTimer.Dispose();
return;
}
var _border_viewport = _scrollViewer.GetViewportBorder();
if (CanMovePosition)
{
_location = this.TranslatePoint(new Point(0, 0), _scrollViewer.GetContentGrid());
}
Rect bounds = new Rect(_location.X, _location.Y, ActualWidth, ActualHeight);
Rect rect = new Rect(0.0, _scrollViewer.GetScrollPosition(), _border_viewport.ActualWidth, _border_viewport.ActualHeight);
if (_innerBorder != null)
{
if (bounds.IntersectsWith(rect))
{
if (Disconnect || _element == null)
{
if (_innerBorder.Child == _replaceContent || _element == null)
{
_element = Content.LoadContent() as FrameworkElement;
if (_parentNameScope != null)
{
NameScope.SetNameScope(_element, _parentNameScope);
}
_innerBorder.Child = _element;
_innerBorder.Height = double.NaN;
}
}
}
else
{
if (Disconnect)
{
if (_innerBorder.Child == _element)
{
double height = _element != null ? _element.ActualHeight : MinHeight;
_innerBorder.Child = _replaceContent;
_innerBorder.Height = height;
}
}
}
}
}
}
}
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