private void RectangleSelection_PointerPressed(object sender, PointerRoutedEventArgs e)
{
itemsPosition.Clear();
originDragPoint = new Point(e.GetCurrentPoint(uiElement).Position.X, e.GetCurrentPoint(uiElement).Position.Y); // Initial drag point relative to the topleft corner
prevSelectedItems = uiElement.SelectedItems.Cast <object>().ToList(); // Save current selected items
var verticalOffset = scrollViewer?.VerticalOffset ?? 0;
originDragPoint.Y += verticalOffset; // Initial drag point relative to the top of the list (considering scrolled offset)
if (!e.GetCurrentPoint(uiElement).Properties.IsLeftButtonPressed || e.Pointer.PointerDeviceType == Windows.Devices.Input.PointerDeviceType.Touch)
{
// Trigger only on left click, do not trigger with touch
return;
}
selectionStrategy = e.KeyModifiers.HasFlag(VirtualKeyModifiers.Control) ?
new InvertPreviousItemSelectionStrategy(uiElement.SelectedItems, prevSelectedItems) :
e.KeyModifiers.HasFlag(VirtualKeyModifiers.Shift) ?
(ItemSelectionStrategy) new ExtendPreviousItemSelectionStrategy(uiElement.SelectedItems, prevSelectedItems) :
new IgnorePreviousItemSelectionStrategy(uiElement.SelectedItems);
selectionStrategy.HandleNoItemSelected();
uiElement.PointerMoved -= RectangleSelection_PointerMoved;
uiElement.PointerMoved += RectangleSelection_PointerMoved;
if (selectionChanged != null)
{
// Unsunscribe from SelectionChanged event for performance
uiElement.SelectionChanged -= selectionChanged;
}
uiElement.CapturePointer(e.Pointer);
selectionState = SelectionState.Starting;
}
private void View_RectangleDrawStart(object sender, Windows.UI.Xaml.Input.PointerRoutedEventArgs e)
{
Point CurrentPoint = e.GetCurrentPoint(View).Position;
AbsStartPoint = new Point(CurrentPoint.X + InnerScrollView.HorizontalOffset, CurrentPoint.Y + InnerScrollView.VerticalOffset);
View.SelectedItems.Clear();
View.CapturePointer(e.Pointer);
View.PointerMoved += View_PointerMoved;
}
private void View_RectangleDrawStart(object sender, PointerRoutedEventArgs e)
{
PointerPoint Pointer = e.GetCurrentPoint(View);
if (e.Pointer.PointerDeviceType == PointerDeviceType.Mouse && Pointer.Properties.IsLeftButtonPressed)
{
Point CurrentPoint = Pointer.Position;
AbsStartPoint = new Point(CurrentPoint.X + (InnerScrollView?.HorizontalOffset).GetValueOrDefault(), CurrentPoint.Y + (InnerScrollView?.VerticalOffset).GetValueOrDefault());
if (IsEnabled)
{
View.CapturePointer(e.Pointer);
}
}
}
private void RectangleSelection_PointerPressed(object sender, PointerRoutedEventArgs e)
{
itemsPosition.Clear();
originDragPoint = new Point(e.GetCurrentPoint(uiElement).Position.X, e.GetCurrentPoint(uiElement).Position.Y); // Initial drag point relative to the topleft corner
var verticalOffset = scrollViewer?.VerticalOffset ?? 0;
originDragPoint.Y = originDragPoint.Y + verticalOffset; // Initial drag point relative to the top of the list (considering scrolled offset)
if (!e.GetCurrentPoint(uiElement).Properties.IsLeftButtonPressed)
{
// Trigger only on left click
return;
}
uiElement.PointerMoved -= RectangleSelection_PointerMoved;
uiElement.PointerMoved += RectangleSelection_PointerMoved;
if (selectionChanged != null)
{
// Unsunscribe from SelectionChanged event for performance
uiElement.SelectionChanged -= selectionChanged;
}
uiElement.CapturePointer(e.Pointer);
selectionState = SelectionState.Starting;
}