// This must be called manually each tick that the ScrollTracker is active.
public void HandleInput(FarseerXNABase.ScreenSystem.InputHelper input)
{
// Turn on tracking as soon as we seen any kind of touch. We can't use gestures for this
// because no gesture data is returned on the initial touch. We have to be careful to
// pick out only 'Pressed' locations, because TouchState can return other events a frame
// *after* we've seen GestureType.Flick or GestureType.DragComplete.
if (!IsTracking)
{
for (int i = 0; i < input.TouchState.Count; i++)
{
if (input.TouchState[i].State == TouchLocationState.Pressed)
{
Velocity = Vector2.Zero;
UnclampedViewOrigin = ViewOrigin;
IsTracking = true;
break;
}
}
}
foreach (GestureSample sample in input.Gestures)
{
switch (sample.GestureType)
{
case GestureType.VerticalDrag:
UnclampedViewOrigin.Y -= sample.Delta.Y;
break;
case GestureType.Flick:
// Only respond to mostly-vertical flicks
if (Math.Abs(sample.Delta.X) < Math.Abs(sample.Delta.Y))
{
IsTracking = false;
Velocity = -sample.Delta;
}
break;
case GestureType.DragComplete:
IsTracking = false;
break;
case GestureType.Tap:
break;
}
}
}
/// <summary>
/// Called once per frame to update the control; override this method if your control requires custom updates.
/// Call base.Update() to update any child controls.
/// </summary>
public virtual void HandleInput(FarseerXNABase.ScreenSystem.InputHelper input)
{
for (int i = 0; i < ChildCount; i++)
{
children[i].HandleInput(input);
}
}
public override void HandleInput(FarseerXNABase.ScreenSystem.InputHelper input)
{
scrollTracker.HandleInput(input);
base.HandleInput(input);
}
