Simultaneous Single and Double Click functions?

Question

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

Answer 1

Best Answer

Answer by Tetrad · Jun 16, 2010 at 07:05 PM

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.

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pickledzebra · Jun 17, 2010 at 12:20 PM 0

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Thanks. The logic seems simple, but I'm having difficulty figuring out how to initiate the single-click (mousedrag) without waiting for a second click to verify the time gap is large enough.

Tetrad · Jun 17, 2010 at 12:21 PM 0

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What you could do is start your mouse drag immediately, and if a double click is detected "undo" your mouse drag movement.

pickledzebra · Jun 17, 2010 at 12:38 PM 0

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That might work. I'm wondering if coroutines would work here - though I'm not sure how to implement them either. Perhaps start both, but have a yield statement that will let the double-click check run to completion?

Answer 2

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.

Answer 3

Answer by superboy007 · Oct 25, 2013 at 11:33 AM

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;
 }

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Simultaneous Single and Double Click functions?

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