VisualInteractionSource.IsPositionYRailsEnabled Property

Definition

Namespace:

Windows.UI.Composition.Interactions

Indicates whether panning on the y-axis is railed.

The IsPositionYRailsEnabled property defines the railing configuration for when Y-axis panning gets sent to the corresponding InteractionTracker. When enabled, if the initial part of the pan is angled within a particular range relative to the Y-axis, the X component of the pan is ignored and considered a perfect vertical pan. This property is often enabled in situations where both an X and Y scrolling experience is enabled, but also requires reliable, perfect vertical panning.

public:
 property bool IsPositionYRailsEnabled { bool get(); void set(bool value); };

bool IsPositionYRailsEnabled();

void IsPositionYRailsEnabled(bool value);

public bool IsPositionYRailsEnabled { get; set; }

var boolean = visualInteractionSource.isPositionYRailsEnabled;
visualInteractionSource.isPositionYRailsEnabled = boolean;

Public Property IsPositionYRailsEnabled As Boolean

Property Value

Boolean

bool

Boolean value indicating whether panning on the y-axis is railed.

Examples

void SetupInteractionSource(ContainerVisual container, InteractionTracker 	tracker)
{
  // Setup the InteractionSource
  _interactionSource = VisualInteractionSource.Create(container);
  // Enable the property for rails on the Y axis being enabled
  _interactionSource.IsPositionYRailsEnabled = true;
  // Add the InteractionSource to the InteractionTracker
  tracker.InteractionSources.Add(_interactionSource);
}

Remarks

When this property is enabled, the system provides more leniency in what is considered a “perfect” vertical pan. Often times when a finger pans across the screen, it is very difficult for an end user to achieve a perfect pan in the Y-direction. This property helps makes it more possible to have “perfect” vertical panning in scenarios (such as multi-directional scrolling) where both X and Y panning is already enabled.

When enabled, pans within 22.5 degrees of the vertical axis will get recognized as “perfect” vertical pans – in other words, their X components will be ignored. Note that the angle of the pan is determined within the first few millimeters of the interaction and will retain that angle until the finger is lifted. If outside the threshold of 22.5 degrees of the axis, then the X component will then be recognized.

The diagram below shows this in a visual format:

Note

When rails are enabled, this has an impact to chaining. The system will only chain up to its nearest acenstor VisualInteractionSource when the pan is within 22.5 degrees of the axis.