private void RectangleSelection_PointerReleased(object sender, PointerRoutedEventArgs e)
{
Canvas.SetLeft(selectionRectangle, 0);
Canvas.SetTop(selectionRectangle, 0);
selectionRectangle.Width = 0;
selectionRectangle.Height = 0;
uiElement.PointerMoved -= RectangleSelection_PointerMoved;
scrollViewer.ViewChanged -= ScrollViewer_ViewChanged;
uiElement.ReleasePointerCapture(e.Pointer);
if (selectionChanged != null)
{
// Restore and trigger SelectionChanged event
uiElement.SelectionChanged -= selectionChanged;
uiElement.SelectionChanged += selectionChanged;
if (prevSelectedItems == null || !uiElement.SelectedItems.SequenceEqual(prevSelectedItems))
{
// Trigger SelectionChanged event if the selection has changed
selectionChanged(sender, null);
}
}
if (selectionState == SelectionState.Active || e.OriginalSource is ListViewBase)
{
// Always trigger SelectionEnded to focus the file list when clicking on the empty space (#2977)
OnSelectionEnded();
}
selectionStrategy = null;
selectionState = SelectionState.Inactive;
e.Handled = true;
}
private void RectangleSelection_PointerPressed(object sender, PointerRoutedEventArgs e)
{
if (scrollViewer == null)
{
return;
}
itemsPosition.Clear();
scrollViewer.ViewChanged -= ScrollViewer_ViewChanged;
scrollViewer.ViewChanged += ScrollViewer_ViewChanged;
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;
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;
}
FetchItemsPosition();
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;
}
