public override void OnApplyTemplate()
{
base.OnApplyTemplate();
SelectionHelper.SetEnableSelection(this, true);
UpdateCollumnHeader();
#region Update scroll position if scroll bar disappear
ScrollViewer scrollView = UITools.FindVisualChild <ScrollViewer>(this);
DependencyPropertyDescriptor vertScrollbarVisibilityDescriptor =
DependencyPropertyDescriptor.FromProperty(
ScrollViewer.ComputedVerticalScrollBarVisibilityProperty, typeof(ScrollViewer));
vertScrollbarVisibilityDescriptor.AddValueChanged
(scrollView, delegate
{
if (scrollView.ComputedHorizontalScrollBarVisibility == System.Windows.Visibility.Collapsed)
{
VirtualizingPanel panel = UITools.FindVisualChild <VirtualizingPanel>(this);
if (panel is IScrollInfo)
{
(panel as IScrollInfo).SetVerticalOffset(0);
}
}
});
DependencyPropertyDescriptor horzScrollbarVisibilityDescriptor =
DependencyPropertyDescriptor.FromProperty(
ScrollViewer.ComputedHorizontalScrollBarVisibilityProperty, typeof(ScrollViewer));
horzScrollbarVisibilityDescriptor.AddValueChanged
(scrollView, delegate
{
if (scrollView.ComputedHorizontalScrollBarVisibility == System.Windows.Visibility.Collapsed)
{
VirtualizingPanel panel = UITools.FindVisualChild <VirtualizingPanel>(this);
if (panel is IScrollInfo)
{
(panel as IScrollInfo).SetHorizontalOffset(0);
}
}
});
#endregion
#region ContextMenu
Point mouseDownPt = new Point(-100, -100);
this.AddHandler(TreeViewItem.PreviewMouseRightButtonDownEvent, new MouseButtonEventHandler(
(MouseButtonEventHandler) delegate(object sender, MouseButtonEventArgs args)
{
mouseDownPt = args.GetPosition(this);
}));
this.AddHandler(TreeViewItem.MouseRightButtonUpEvent, new MouseButtonEventHandler(
(MouseButtonEventHandler) delegate(object sender, MouseButtonEventArgs args)
{
Point mouseUpPt = args.GetPosition(this);
if ((Math.Abs(mouseDownPt.X - mouseUpPt.X) < 5) &&
(Math.Abs(mouseDownPt.Y - mouseUpPt.Y) < 5))
{
args.Handled = true;
if (ContextMenuCommand != null && ContextMenuCommand.CanExecute(this.DataContext))
{
if (SelectedValue != null)
{
ContextMenuCommand.Execute(this.DataContext);
}
}
}
}));
#endregion
//Memory Leak
//Unloaded += (o, e) =>
//{
// SelectionHelper.SetEnableSelection(o as FileList2, false);
// (o as FileList2).View = null;
//};
}
static void UpdateSelection(ScrollContentPresenter p, Rect selectionBounds, bool highlightOnly)
{
ListView lvControl = UITools.FindAncestor <ListView>(p);
if (lvControl != null)
{
IChildInfo icInfo = UITools.FindVisualChild <Panel>(p) as IChildInfo;
List <object> newList = new List <object>();
List <int> newIntList = new List <int>();
if (icInfo != null)
{
for (int i = 0; i < lvControl.Items.Count; i++)
{
if (icInfo.GetChildRect(i).IntersectsWith(selectionBounds))
{
newList.Add(lvControl.Items[i]);
newIntList.Add(i);
}
}
}
else
//0.4 For GridView, only support selection if drag occur inside the first column
if (lvControl.View is GridView)
{
Point curPos = (Point)PositionCheck(GetSelectionAdorner(p), Mouse.GetPosition(p));
if ((lvControl.View as GridView).Columns.Count > 0)
{
double col0width = (lvControl.View as GridView).Columns[0].ActualWidth;
if (curPos.X < col0width || GetStartPosition(p).X < col0width)
{
if (_firstSelectedItem == null)
{
_firstSelectedItem = getSelectedItem(p, curPos);
}
ListViewItem curSelectedItem = getSelectedItem(p, curPos);
if (_firstSelectedItem != null && curSelectedItem != null)
{
int startIdx = lvControl.ItemContainerGenerator.IndexFromContainer(_firstSelectedItem);
int endIdx = lvControl.ItemContainerGenerator.IndexFromContainer(curSelectedItem);
for (int i = Math.Min(startIdx, endIdx); i <= Math.Max(startIdx, endIdx); i++)
{
if (i >= 0)
{
newList.Add(lvControl.Items[i]);
newIntList.Add(i);
}
}
}
}
}
}
if (highlightOnly)
{
SetHighlightCount(lvControl, newIntList.Count);
HighlightItems(lvControl, newIntList);
}
else
{
SetHighlightCount(lvControl, 0);
UnhighlightItems(lvControl);
UpdateSelectedItems(lvControl, newList);
}
}
}
static void OnMouseUp(object sender, MouseButtonEventArgs e)
{
ScrollContentPresenter p = getScrollContentPresenter(sender);
if (e.ChangedButton == MouseButton.Left)
{
if (GetIsDragging(p))
{
EndDragging(p);
Mouse.Capture(null);
UITools.FindAncestor <ListView>(p).Focus();
ListViewItem curSelectedItem = getSelectedItem(p, Mouse.GetPosition(p));
if (curSelectedItem != null && curSelectedItem.Equals(_itemUnderMouse))
{
ListView lvControl = UITools.FindAncestor <ListView>(p);
ClearSelection(lvControl);
_itemUnderMouse.IsSelected = true;
}
}
if (Point.Subtract(GetStartPosition(p), Mouse.GetPosition(p)).Length < 10.0d)
{
ListView lvControl = UITools.FindAncestor <ListView>(p);
ClearSelection(lvControl);
}
if (_firstSelectedItem != null)
{
_firstSelectedItem.IsSelected = true;
}
_firstSelectedItem = null;
SetIsDragging(p, false);
}
else if (e.ChangedButton == MouseButton.Right)
{
ListView lvControl = UITools.FindAncestor <ListView>(p);
ClearSelection(lvControl);
if (_itemUnderMouse != null)
{
_itemUnderMouse.IsSelected = false;
}
if (_firstSelectedItem != null)
{
_firstSelectedItem.IsSelected = false;
}
_firstSelectedItem = null;
SetIsDragging(p, false);
return;
}
else
{
}
#endregion
#region Data
#endregion
}
public static void OnEnableSelectionpChanged(DependencyObject s, DependencyPropertyChangedEventArgs e)
{
if (s is ListView)
{
ListView control = s as ListView;
var OnScrollChange = (RoutedEventHandler) delegate(object sender, RoutedEventArgs args)
{
ItemsPresenter ip = UITools.FindVisualChild <ItemsPresenter>(sender as ListView);
ScrollContentPresenter p = UITools.FindAncestor <ScrollContentPresenter>(ip);
if (GetIsDragging(p) && Mouse.LeftButton == MouseButtonState.Pressed)
{
UpdatePosition(p, true);
}
};
var OnMouseDown = (RoutedEventHandler) delegate(object sender, RoutedEventArgs args)
{
ClearSelection(sender as ListView);
};
var OnSizeChanged = (RoutedEventHandler) delegate(object sender, RoutedEventArgs args)
{
ItemsPresenter ip = UITools.FindVisualChild <ItemsPresenter>(sender as ListView);
ScrollContentPresenter p = UITools.FindAncestor <ScrollContentPresenter>(ip);
EndDragging(p);
};
Action unloadAdorner = () =>
{
ScrollContentPresenter p = GetLastScrollContentPresenter(control);
if (p != null)
{
SelectionAdorner _adorner = GetSelectionAdorner(p);
if (AdornerLayer.GetAdornerLayer(p) != null)
{
AdornerLayer.GetAdornerLayer(p).Remove(_adorner);
}
control.MouseUp -= new MouseButtonEventHandler(OnMouseUp);
control.MouseMove -= new MouseEventHandler(OnMouseMove);
_adorner.PreviewMouseDown -= new MouseButtonEventHandler(OnPreviewMouseDown);
_adorner.MouseMove -= new MouseEventHandler(OnMouseMove);
_adorner.MouseUp -= new MouseButtonEventHandler(OnMouseUp);
control.RemoveHandler(ListView.SizeChangedEvent, OnSizeChanged);
SetSelectionAdorner(p, null);
}
};
Action attachAdorner = () =>
{
unloadAdorner();
ItemsPresenter ip = UITools.FindVisualChild <ItemsPresenter>(control);
ScrollContentPresenter p = UITools.FindAncestor <ScrollContentPresenter>(ip);
if (p != null)
{
SelectionAdorner _adorner = new SelectionAdorner(p);
SetSelectionAdorner(p, _adorner);
AdornerLayer.GetAdornerLayer(p).Add(_adorner);
control.PreviewMouseDown += new MouseButtonEventHandler(OnPreviewMouseDown);
control.MouseUp += new MouseButtonEventHandler(OnMouseUp);
control.MouseMove += new MouseEventHandler(OnMouseMove);
_adorner.PreviewMouseDown += new MouseButtonEventHandler(OnPreviewMouseDown);
_adorner.MouseMove += new MouseEventHandler(OnMouseMove);
_adorner.MouseUp += new MouseButtonEventHandler(OnMouseUp);
control.AddHandler(ListView.SizeChangedEvent, OnSizeChanged);
SetLastScrollContentPresenter(control, p);
}
};
if ((bool)e.NewValue == true)
{
if (control.IsLoaded)
{
attachAdorner();
}
else
{
control.Loaded += delegate { attachAdorner(); }
};
control.AddHandler(ScrollViewer.ScrollChangedEvent, OnScrollChange);
control.AddHandler(ListView.MouseDownEvent, OnMouseDown);
//Monitor view change, and reattach handlers.
DependencyPropertyDescriptor viewDescriptor = DependencyPropertyDescriptor.FromProperty(ListView.ViewProperty, typeof(ListView));
viewDescriptor.AddValueChanged
(control, delegate
{
control.Dispatcher.BeginInvoke(DispatcherPriority.Input, attachAdorner);
});
}
else //If EnableSelection = False
{
unloadAdorner();
control.RemoveHandler(ScrollViewer.ScrollChangedEvent, OnScrollChange);
control.RemoveHandler(ListView.MouseDownEvent, OnMouseDown);
SetSelectionAdorner(control, null);
}
}
}
