public virtual void ItemLeft(GameObject item)
{
// release the item from this object's hierarchy
item.transform.SetParent(JohnnyUITools.GetMyCanvas(gameObject).transform);
currentItem = null;
}
/// <summary>
/// find mouse position under the gameobject's canvas
/// </summary>
/// <param name="gameObject"></param>
/// <returns>Vector2: mouse position</returns>
public static Vector2 GetMousePosInMyCanvas(GameObject gameObject)
{
// find the canvas I'm currently under
Canvas myCanvas = JohnnyUITools.GetMyCanvas(gameObject);
// calculate mouse's position using this canvas' coordinates (anchor = lower left corner)
float mousePosX = Input.mousePosition.x;
float mousePosY = Input.mousePosition.y;
float canvasWidth = myCanvas.GetComponent <RectTransform>().sizeDelta.x;
float canvasHeight = myCanvas.GetComponent <RectTransform>().sizeDelta.y;
float mousePosInCanvasX = mousePosX / Screen.width * canvasWidth;
float mousePosInCanvasY = mousePosY / Screen.height * canvasHeight;
return(new Vector2(mousePosInCanvasX, mousePosInCanvasY));
}