private bool MouseWheel(IMouseDevice device, ulong timestamp, IInputRoot root, Point p,
PointerPointProperties props,
Vector delta, KeyModifiers inputModifiers, IInputElement?hitTest)
{
device = device ?? throw new ArgumentNullException(nameof(device));
root = root ?? throw new ArgumentNullException(nameof(root));
var source = _pointer.Captured ?? hitTest;
// KeyModifiers.Shift should scroll in horizontal direction. This does not work on every platform.
// If Shift-Key is pressed and X is close to 0 we swap the Vector.
if (inputModifiers == KeyModifiers.Shift && MathUtilities.IsZero(delta.X))
{
delta = new Vector(delta.Y, delta.X);
}
if (source is not null)
{
var e = new PointerWheelEventArgs(source, _pointer, root, p, timestamp, props, inputModifiers, delta);
source?.RaiseEvent(e);
return(e.Handled);
}
return(false);
}
private bool MouseWheel(IMouseDevice device, IInputRoot root, Point p, Vector delta, InputModifiers inputModifiers)
{
Contract.Requires <ArgumentNullException>(device != null);
Contract.Requires <ArgumentNullException>(root != null);
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);
}
private bool MouseWheel(IMouseDevice device, ulong timestamp, IInputRoot root, Point p,
PointerPointProperties props,
Vector delta, KeyModifiers inputModifiers)
{
Contract.Requires <ArgumentNullException>(device != null);
Contract.Requires <ArgumentNullException>(root != null);
var hit = HitTest(root, p);
if (hit != null)
{
var source = GetSource(hit);
var e = new PointerWheelEventArgs(source, _pointer, root, p, timestamp, props, inputModifiers, delta);
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 || Extent.Width > Viewport.Width)
{
var scrollable = Child as ILogicalScrollable;
bool isLogical = scrollable?.IsLogicalScrollEnabled == true;
double x = Offset.X;
double y = Offset.Y;
if (Extent.Height > Viewport.Height)
{
double height = isLogical ? scrollable.ScrollSize.Height : 50;
y += -e.Delta.Y * height;
y = Math.Max(y, 0);
y = Math.Min(y, Extent.Height - Viewport.Height);
}
if (Extent.Width > Viewport.Width)
{
double width = isLogical ? scrollable.ScrollSize.Width : 50;
x += -e.Delta.X * width;
x = Math.Max(x, 0);
x = Math.Min(x, Extent.Width - Viewport.Width);
}
Offset = new Vector(x, y);
e.Handled = true;
}
}
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;
}
private void Border_PointerWheelChanged(object sender, PointerWheelEventArgs e)
{
if (_element != null)
{
Point point = e.GetPosition(_element);
point = FixInvalidPointPosition(point);
ZoomDeltaTo(e.Delta.Y, point);
}
}
/// <summary>
/// Called before the <see cref="PointerWheelChanged"/> event occurs.
/// </summary>
/// <param name="e">The event args.</param>
protected virtual void OnPointerWheelChanged(PointerWheelEventArgs e)
{
}