Problem with OnMouseUp

Question

I have, for example, 3 plane gameobjects in my scene. I want to have an operation like t$$anonymous$$s:

mouse click on one of the objects and drag to another object, and release mouse click

So I implement OnMouseDown and OnMouseUp function in a script and place them in each of the objects. However I got a problem. If I click on one of the objects and mouseover another object (say Object B), and then release the mouse click outside all objects, the OnMouseUp function still triggers and works on Object B. If I use OnMouseUpAsButton, it doesnt fire at all.

How to prevent OnMouseUp to trigger if I dont release the mouse click on objects? Any simple method other than checking the cursor position and calculate ranges. Thank you.

Answer 1

Answer by robertbu · Jan 21, 2014 at 04:23 AM

Short of Raycasting or some other cursor position check, I don't t$$anonymous$$nk you can get what you want. Your description is not what I believe is happening. You get the OnMouseUp() in the same game object that got the OnMouseDown(). Even if the mouse is over another game object, the OnMouseUp() still goes to the original game object. You can tell if the 'up' is over the original game object using:

 var over = false;
  
 function OnMouseEnter() {
     over = true;
 }
 
 function OnMouseExit() {
     over = false;
 }
 
 function OnMouseUp()
 {
     if (over) {
         Debug.Log("Button release over the same object as down");
     }
     else {
         Debug.Log("Button released not over the same object as down");
     }    
 }

But t$$anonymous$$s will not tell you if the Up is over another game object or none at all.

4 Show 3 · Share

fanling3 · Jan 21, 2014 at 04:40 AM 0

Share

Since all gameobjects share the same script so I was confused. Yes you are right if I click on Object A and release the mouse click somewhere else, OnMouseUp from script of Object A triggers

fanling3 · Jan 21, 2014 at 04:41 AM 0

Share

So is it true OnMouseUp never triggers if OnMouseDown of the same gameobject does not trigger before?

robertbu · Jan 21, 2014 at 04:51 AM 0

Share

As far as I know that is true. The object that gets the OnMouseDown() is the same object that gets the OnMouseUp() even of the mouse is over a different game object or none at all.

Answer 2

Answer by SUfIaNAHMAD_ · 3 days ago

Helpful ThanK You

0 · Share

Answer 3

Answer by logicandchaos · 3 days ago

There are interfaces to do all this: https://docs.unity3d.com/2019.1/Documentation/ScriptReference/EventSystems.IPointerUpHandler.html

0 · Share

Problem with OnMouseUp

3 Replies

Your answer

Welcome to Unity Answers

Follow this Question

Related Questions