/// <inheritdoc/>
protected override void OnTouchUp(TouchDevice device, Int64 id, RoutedEventData data)
{
if (TouchesCaptured.Contains(id) && IsDragging)
{
HandleCursorUp(id);
ReleaseTouchCapture(id);
data.Handled = true;
}
base.OnTouchUp(device, id, data);
}
/// <summary>
/// Translate and scale the content when it is manipulated.
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">The <see cref="System.Windows.Input.ManipulationDeltaEventArgs"/> instance containing the event data.</param>
private void ContentManipulationProcessor_Affine2DManipulationDelta(object sender, Manipulation2DDeltaEventArgs e)
{
if (GetMaxScale() == 1)
{
return;
}
// The inertia processor can move the content out of bounds.
if (sender == _inertiaProcessor)
{
_translate.X += e.Delta.TranslationX;
_translate.Y += e.Delta.TranslationY;
_scale.ScaleX *= e.Delta.ScaleX;
_scale.ScaleY *= e.Delta.ScaleY;
return;
}
_spring.Stop(this);
// Determine what scale to apply to the content.
bool returnControlToScatterViewItem = false;
double scaleDelta = 1;
double newScale = _scale.ScaleX * e.Delta.ScaleX;
if (_content.ActualWidth * newScale >= ActualWidth && newScale <= GetMaxScale())
{
// If the new scale is within the bounds, just use it directly.
scaleDelta = e.Delta.ScaleX;
}
else if (e.Delta.ScaleX > 1)
{
// Apply friction to an increasing scale.
scaleDelta = 1 + ((e.Delta.ScaleX - 1) * _friction);
}
else if (e.Delta.ScaleX < 1)
{
// Apply friction to a decreasing scale.
scaleDelta = 1 - ((1 - e.Delta.ScaleX) * _friction);
returnControlToScatterViewItem = _scale.ScaleX <= .95;
}
_scale.ScaleX *= scaleDelta;
_scale.ScaleY *= scaleDelta;
if (returnControlToScatterViewItem)
{
// If the content is scaled down to less than the default size, return control back to the ScatterViewItem.
if (ScatterViewItem != null)
{
TouchesCaptured.ToList().ForEach(c => c.Capture(ScatterViewItem));
_overridingScatterViewItem = false;
}
}
// Move the content.
_translate.X += e.Delta.TranslationX;
_translate.Y += e.Delta.TranslationY;
// Get the new bounds of the image.
Rect bounds = GetContentBounds();
if (bounds.TopLeft.X > 0 || bounds.BottomRight.X < ActualWidth)
{
// Apply friction if the content is out of bounds on the x-axis.
_translate.X -= e.Delta.TranslationX;
_translate.X += e.Delta.TranslationX * _friction;
}
if (bounds.TopLeft.Y > 0 || bounds.BottomRight.Y < ActualHeight)
{
// Apply friction if the content is out of bounds on the y-axis.
_translate.Y -= e.Delta.TranslationY;
_translate.Y += e.Delta.TranslationY * _friction;
}
}
} // proc OnMouseWheel
/// <summary></summary>
/// <param name="e"></param>
protected override void OnTouchDown(TouchEventArgs e)
{
base.OnTouchDown(e);
if (e.Source is RepeatButton)
{
return;
}
if (e.OriginalSource is Border border && String.Compare(border.Name, partItemBorder, false) == 0 && TouchesCaptured.Count() == 0)
{
lastTouchPosition = e.GetTouchPoint(this).Position.Y;
EnsureFocus();
CaptureTouch(e.TouchDevice);
}
} // proc OnTouchDown
