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Updated mouse wheel event handling

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ClemensFischer 2025-06-12 00:31:01 +02:00
parent 140f800f33
commit cceb122486
4 changed files with 122 additions and 74 deletions
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35
MapControl/WinUI/Map.WinUI.cs
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@ -20,7 +20,9 @@ namespace MapControl
public static readonly DependencyProperty MouseWheelZoomDeltaProperty =
DependencyPropertyHelper.Register<Map, double>(nameof(MouseWheelZoomDelta), 0.25);
private double mouseWheelDelta;
public static readonly DependencyProperty MouseWheelZoomAnimatedProperty =
DependencyPropertyHelper.Register<Map, bool>(nameof(MouseWheelZoomAnimated), true);
private bool? manipulationEnabled;
public Map()
@ -48,25 +50,36 @@ namespace MapControl
set => SetValue(MouseWheelZoomDeltaProperty, value);
}
/// <summary>
/// Gets or sets a value that controls whether zooming by a PointerWheelChanged event is animated.
/// The default value is true.
/// </summary>
public bool MouseWheelZoomAnimated
{
get => (bool)GetValue(MouseWheelZoomAnimatedProperty);
set => SetValue(MouseWheelZoomAnimatedProperty, value);
}
private void OnPointerWheelChanged(object sender, PointerRoutedEventArgs e)
{
if (e.Pointer.PointerDeviceType == PointerDeviceType.Mouse)
{
var point = e.GetCurrentPoint(this);
var delta = point.Properties.MouseWheelDelta;
var zoomLevel = TargetZoomLevel + MouseWheelZoomDelta * delta / 120d;
var animated = false;
// Standard mouse wheel delta value is 120.
//
mouseWheelDelta += point.Properties.MouseWheelDelta / 120d;
if (Math.Abs(mouseWheelDelta) >= 1d)
if (delta % 120 == 0)
{
// Zoom to integer multiple of MouseWheelZoomDelta.
// Zoom to integer multiple of MouseWheelZoomDelta when delta is a multiple of 120,
// i.e. when the event was actually raised by a mouse wheel and not by a touch pad
// or a similar device with higher resolution.
//
ZoomMap(point.Position,
MouseWheelZoomDelta * Math.Round(TargetZoomLevel / MouseWheelZoomDelta + mouseWheelDelta));
mouseWheelDelta = 0d;
zoomLevel = MouseWheelZoomDelta * Math.Round(zoomLevel / MouseWheelZoomDelta);
animated = MouseWheelZoomAnimated;
}
ZoomMap(point.Position, zoomLevel, animated);
}
}