private void ProcessActiveContact(TouchpadEventArgs eventArgs)
{
// If we're not inside an active 'tap', instantiate one.
if (currentTap == null)
{
currentTap = new TapData(Constants.MaxContacts);
}
bool wasActive = currentTap.InstantaneousActiveContacts[eventArgs.ContactIndex];
currentTap.InstantaneousActiveContacts[eventArgs.ContactIndex] = true;
// If we were previously active, add the distance from the last X/Y
// to this new one to the total distance in the tap object.
if (wasActive)
{
uint previousX = currentTap.PreviousXValues[eventArgs.ContactIndex];
uint previousY = currentTap.PreviousYValues[eventArgs.ContactIndex];
double positionDelta = Math.Sqrt(Math.Pow((double)eventArgs.X - previousX, 2) + Math.Pow((double)eventArgs.Y - previousY, 2));
currentTap.TotalContactDistances[eventArgs.ContactIndex] += positionDelta;
}
currentTap.MaximumActiveContacts = Math.Max(currentTap.InstantaneousActiveContacts.Count(ac => ac), currentTap.MaximumActiveContacts);
currentTap.MaximumPressure = Math.Max(currentTap.MaximumPressure, eventArgs.Pressure);
currentTap.PreviousXValues[eventArgs.ContactIndex] = eventArgs.X;
currentTap.PreviousYValues[eventArgs.ContactIndex] = eventArgs.Y;
if (eventArgs.Pressure >= config.TapTriggerThreshold)
{
currentTap.TapThresholdMet = true;
}
// If we're not minimized, update the form values
if (WindowState != FormWindowState.Minimized &&
(!lastActiveContactUiUpdates[eventArgs.ContactIndex].HasValue || (DateTime.Now - lastActiveContactUiUpdates[eventArgs.ContactIndex].Value).TotalMilliseconds >= 50))
{
ActiveContactDisplay contactDisplay = activeContactDisplays[eventArgs.ContactIndex];
contactDisplay.Active = true;
contactDisplay.Pressure = eventArgs.Pressure;
contactDisplay.X = eventArgs.X;
contactDisplay.Y = eventArgs.Y;
lastActiveContactUiUpdates[eventArgs.ContactIndex] = DateTime.Now;
}
}
private void HandleContactEnd(object sender, TouchpadEventArgs e)
{
// If the tap object is null, just bail out
if (currentTap == null)
{
return;
}
currentTap.InstantaneousActiveContacts[e.ContactIndex] = false;
int currentActiveContacts = currentTap.InstantaneousActiveContacts.Count(ac => ac);
// Has the tap ended?
if (currentActiveContacts == 0)
{
DateTime tapEnd = DateTime.Now;
// Okay, was this *really* a tap?
// We need to validate by checking the total duration, whether the pressure threshold was met,
// and if the distance was within the maximum range.
if ((tapEnd - currentTap.Start).TotalMilliseconds <= config.MaxTapMilliseconds &&
currentTap.TapThresholdMet &&
currentTap.TotalContactDistances.Max() <= config.MaxTapDeltaPosition)
{
// If it was a single-finger tap, inject a left click.
if (currentTap.MaximumActiveContacts == 1)
{
SendLeftClick();
}
// If it was a double-finger tap, inject a right click.
else if (currentTap.MaximumActiveContacts == 2)
{
SendRightClick();
}
else if (currentTap.MaximumActiveContacts == 3)
{
SendMiddleClick();
}
}
// Store reference to previous tap. Will probably need this later
// if we want to add in support for double-tap-and-drag.
previousTap = currentTap;
// Clear out current tap, for it is over and done
currentTap = null;
// If we're not minimized, update form values
if (WindowState != FormWindowState.Minimized)
{
// Update previous tap display
previousMaxPressureLabel.Text = previousTap.MaximumPressure.ToString();
previousDurationLabel.Text = ((int)(tapEnd - previousTap.Start).TotalMilliseconds).ToString();
previousMaxDistanceLabel.Text = ((int)previousTap.TotalContactDistances.Max()).ToString();
previousContactCountLabel.Text = previousTap.MaximumActiveContacts.ToString();
previousMaxPressureLabel.ForeColor = previousTap.MaximumPressure >= config.TapTriggerThreshold
? Color.DarkGreen
: Color.DarkRed;
previousDurationLabel.ForeColor = (tapEnd - previousTap.Start).TotalMilliseconds < config.MaxTapMilliseconds
? Color.DarkGreen
: Color.DarkRed;
previousMaxDistanceLabel.ForeColor = previousTap.TotalContactDistances.Max() < config.MaxTapDeltaPosition
? Color.DarkGreen
: Color.DarkRed;
previousContactCountLabel.ForeColor = previousTap.MaximumActiveContacts >= 1 && previousTap.MaximumActiveContacts <= 3
? Color.Green
: Color.DarkRed;
}
}
if (WindowState != FormWindowState.Minimized)
{
ActiveContactDisplay contactDisplay = activeContactDisplays[e.ContactIndex];
contactDisplay.Active = false;
contactDisplay.Pressure = 0;
contactDisplay.X = 0;
contactDisplay.Y = 0;
}
}