private bool MouseWheel(IMouseDevice device, IInputRoot root, Point p, Vector delta, InputModifiers inputModifiers)
{
var hit = HitTest(root, p);
if (hit != null)
{
var source = GetSource(hit);
var e = new PointerWheelEventArgs
{
Device = this,
RoutedEvent = InputElement.PointerWheelChangedEvent,
Source = source,
Delta = delta,
InputModifiers = inputModifiers
};
source?.RaiseEvent(e);
return(e.Handled);
}
return(false);
}
/// <summary>
/// Called before the <see cref="PointerWheelChanged"/> event occurs.
/// </summary>
/// <param name="e">The event args.</param>
protected virtual void OnPointerWheelChanged(PointerWheelEventArgs e)
{
}
/// <inheritdoc/>
protected override void OnPointerWheelChanged(PointerWheelEventArgs e)
{
if (Extent.Height > Viewport.Height)
{
var y = Offset.Y + (-e.Delta.Y * 50);
y = Math.Max(y, 0);
y = Math.Min(y, Extent.Height - Viewport.Height);
Offset = new Vector(Offset.X, y);
e.Handled = true;
}
}
/// <summary>
/// Called before the <see cref="PointerWheelChanged"/> event occurs.
/// </summary>
/// <param name="e">The event args.</param>
protected virtual void OnPointerWheelChanged(PointerWheelEventArgs e)
{
}
private bool MouseWheel(IMouseDevice device, IInputRoot root, Point p, Vector delta, InputModifiers inputModifiers)
{
var hit = HitTest(root, p);
if (hit != null)
{
var source = GetSource(hit);
var e = new PointerWheelEventArgs
{
Device = this,
RoutedEvent = InputElement.PointerWheelChangedEvent,
Source = source,
Delta = delta,
InputModifiers = inputModifiers
};
source?.RaiseEvent(e);
return e.Handled;
}
return false;
}
