Simultaneous Single and Double Click functions?

Questions & Answers
1

I'm having some difficulty figuring out the logic of how to address the following problem (as well as coding it in Javascript).

I have a single-click (mousedrag) function to rotate/zoom an object in my scene.

I also have a double-click "picking" function for objects in my scene. The "picking" function actually does some fairly complicated things in terms of rearranging objects and parent-child relationships.

The issue I'm having is that if one clicks spastically (rapid-fire series of clicks), the things being done by the single-click and double-click functions seem to interefere causing my game object of interest to go flying out of sight.

I'm trying to figure out if I can make these mutually exclusive such that they CANNOT happen simultaneously. So, that either of the clicks in a double-click cannot be interpreted as a single click.

thanks for any insights, pointers or code

2

The easiest solution is simply not to execute your single click until you know it's a double click.

So you'd have some input code. You detect a click. If the time it takes to register a double click has passed and there's no second click, you do whatever it is you do for a single click. If there's a second click you do what there is for a double click.

Now for dragging objects, you typically don't register for clicks but for mouse down+hold events. You probably would also want to register for some "how long can the button be down before it's a click vs a click+hold" logic.

3

The following code could be used to determine single click vs double clicks.
It uses a timer that starts after the first mouse click. If the user clicks again before a specified time limit we register that as our second mouse click.

C#
Global Variables

private int mouseClicks   = 0;
private float mouseTimer = 0f;
private float mouseTimerLimit = .25f;

Next we define a function,

void checkMouseDoubleClick()
{
	if(Input.GetMouseButtonDown(0) && GUIUtility.hotControl == 0)
	{
		mouseClicks++;
		Debug.Log("Num of mouse clicks ->" + mouseClicks);
	}
	
	if(mouseClicks >= 1 && mouseClicks < 3)
	{
		mouseTimer += Time.fixedDeltaTime;
		
		if(mouseClicks == 2)
		{
			if(mouseTimer - mouseTimerLimit  < 0)
			{
				Debug.Log("Mouse Double Click");
				mouseTimer = 0;
				mouseClicks = 0;
               /*Here you can add your double click event*/
			}
			else
			{
				Debug.Log("Timer expired");
				mouseClicks = 0;
				mouseTimer = 0;
               /*Here you can add your single click event*/
			}
		}
		
		if(mouseTimer > mouseTimerLimit)
		{
			Debug.Log("Timer expired");
			mouseClicks = 0;
			mouseTimer  = 0;
           /*Here you can add your single click event*/
		}
	}
}

I know the logic can be simplified so feel free to adjust. Again, this function simply checks the time elapsed between the first and second mouse click.

I needed this function for a program in which I could not use Unity’s mouseUp/mouseDown functions.

Hopefully this helps someone in the future.

4

bool mouseClicksStarted = false;
int mouseClicks = 0;
float mouseTimerLimit = .25f;

public void OnClick(){
	mouseClicks++;
	if(mouseClicksStarted){
		return;
	}
	mouseClicksStarted = true;
	Invoke("checkMouseDoubleClick",mouseTimerLimit);
}

 
private void checkMouseDoubleClick()
{
	if(mouseClicks > 1){
		Debug.Log("Double Clickedd");
		
	}else{
		Debug.Log("Single Clicked");
		
	}
	mouseClicksStarted = false;
	mouseClicks = 0;
}