internal void OnPointerEntered(LazoListViewItem item, PointerRoutedEventArgs e)
{
if (_firstItem == null || !_pressed || !e.Pointer.IsInContact /*|| SelectionMode != ListViewSelectionMode.Multiple*/ || e.Pointer.PointerDeviceType != PointerDeviceType.Mouse)
{
return;
}
var point = e.GetCurrentPoint(item);
if (!point.Properties.IsLeftButtonPressed)
{
return;
}
e.Handled = true;
if (SelectionMode != ListViewSelectionMode.Multiple)
{
SelectionMode = ListViewSelectionMode.Multiple;
}
var begin = Items.IndexOf(_firstItem);
if (begin < 0)
{
return;
}
var index = IndexFromContainer(item);
var first = Math.Min(begin, index);
var last = Math.Max(begin, index);
if (SelectedItems.Count > 0)
{
SelectedItems.Clear();
foreach (var original in _ranges)
{
SelectRange(original);
}
}
if (_operation)
{
SelectRange(new ItemIndexRange(first, (uint)Math.Max(1, last - first + 1)));
for (int i = first; i <= last; i++)
{
if (CantSelect(Items[i]))
{
SelectedItems.Remove(Items[i]);
}
}
}
else
{
DeselectRange(new ItemIndexRange(first, (uint)Math.Max(1, last - first + 1)));
}
}
internal void OnPointerPressed(LazoListViewItem item, PointerRoutedEventArgs e)
{
if (SelectionMode == ListViewSelectionMode.None)
{
var point = e.GetCurrentPoint(Window.Current.Content as FrameworkElement);
if (point.Properties.PointerUpdateKind == PointerUpdateKind.LeftButtonPressed && e.Pointer.PointerDeviceType == PointerDeviceType.Mouse)
{
try
{
_recognizer.ProcessDownEvent(point);
}
catch
{
_recognizer.CompleteGesture();
}
}
}
_pressed = true;
}
internal void OnPointerReleased(LazoListViewItem item, PointerRoutedEventArgs e)
{
var point = e.GetCurrentPoint(Window.Current.Content as FrameworkElement);
if (point.Properties.PointerUpdateKind == PointerUpdateKind.LeftButtonReleased && e.Pointer.PointerDeviceType == PointerDeviceType.Mouse)
{
try
{
_recognizer.ProcessUpEvent(point);
}
catch
{
_recognizer.CompleteGesture();
}
}
var first = _firstItem != null?ContainerFromItem(_firstItem) as SelectorItem : null;
var handled = first != null && first.IsSelected == _operation;
_firstItem = null;
_ranges = null;
_pressed = false;
_position = new Point();
if (SelectionMode != ListViewSelectionMode.Multiple)
{
return;
}
if (SelectedItems.Count < 1)
{
SelectionMode = ListViewSelectionMode.None;
}
e.Handled = handled;
}
internal void OnPointerCanceled(LazoListViewItem item, PointerRoutedEventArgs e)
{
_recognizer.CompleteGesture();
}
internal void OnPointerMoved(LazoListViewItem item, PointerRoutedEventArgs e)
{
var child = ItemFromContainer(item);
if (child == null)
{
return;
}
if ((_firstItem != null && _firstItem != child) || !_pressed || !e.Pointer.IsInContact || e.Pointer.PointerDeviceType != PointerDeviceType.Mouse)
{
return;
}
var point = e.GetCurrentPoint(item);
if (!point.Properties.IsLeftButtonPressed)
{
return;
}
e.Handled = true;
if (_firstItem == null)
{
_firstItem = ItemFromContainer(item);
_ranges = SelectedRanges.ToArray();
_operation = !item.IsSelected;
_position = point.Position;
}
else if (_firstItem == child)
{
var contains = SelectedItems.Contains(child);
var delta = Math.Abs(point.Position.Y - _position.Y);
if (delta > 10)
{
SelectionMode = ListViewSelectionMode.Multiple;
if (_operation && !contains)
{
SelectedItems.Add(child);
}
else if (!_operation && contains)
{
SelectedItems.Remove(child);
}
}
else
{
if (_operation && contains)
{
SelectedItems.Remove(child);
}
else if (!_operation && !contains)
{
SelectedItems.Add(child);
}
}
}
}
