Issues with touch buttons in XNA (Release state to be precise)
- by Aditya
I am trying to make touch buttons in WP8 with all the states (Pressed, Released, Moved), but the TouchLocationState.Released is not working.
Here's my code:
Class variables:
bool touching = false;
int touchID;
Button tempButton;
Button is a separate class with a method to switch states when touched.
The Update method contains the following code:
TouchCollection touchCollection = TouchPanel.GetState();
if (!touching && touchCollection.Count > 0)
{
touching = true;
foreach (TouchLocation location in touchCollection)
{
for (int i = 0; i < menuButtons.Count; i++)
{
touchID = location.Id; // store the ID of current touch
Point touchLocation = new Point((int)location.Position.X, (int)location.Position.Y); // create a point
Button button = menuButtons[i];
if (GetMenuEntryHitBounds(button).Contains(touchLocation)) // a method which returns a rectangle.
{
button.SwitchState(true); // change the button state
tempButton = button; // store the pressed button for accessing later
}
}
}
}
else if (touchCollection.Count == 0) // clears the state of all buttons if no touch is detected
{
touching = false;
for (int i = 0; i < menuButtons.Count; i++)
{
Button button = menuButtons[i];
button.SwitchState(false);
}
}
menuButtons is a list of buttons on the menu.
A separate loop (within the Update method) after the touched variable is true
if (touching)
{
TouchLocation location;
TouchLocation prevLocation;
if (touchCollection.FindById(touchID, out location))
{
if (location.TryGetPreviousLocation(out prevLocation))
{
Point point = new Point((int)location.Position.X, (int)location.Position.Y);
if (prevLocation.State == TouchLocationState.Pressed && location.State == TouchLocationState.Released)
{
if (GetMenuEntryHitBounds(tempButton).Contains(point))
// Execute the button action. I removed the excess
}
}
}
}
The code for switching the button state is working fine but the code where I want to trigger the action is not.
location.State == TouchLocationState.Released mostly ends up being false.
(Even after I release the touch, it has a value of TouchLocationState.Moved)
And what is more irritating is that it sometimes works!
I am really confused and stuck for days now. Is this the right way? If yes then where am I going wrong? Or is there some other more effective way to do this?
PS: I also posted this question on stack overflow then realized this question is more appropriate in gamedev. Sorry if it counts as being redundant.
