/// <summary>Sets the position of the tooltip container.</summary>
public static void SetPosition(this Tooltip tooltip, TooltipTrigger trigger, Canvas canvas, Camera camera)
{
Vector3[] triggerCorners = new Vector3[4];
RectTransform triggerRectTrans = trigger.gameObject.GetComponent <RectTransform>();
if (triggerRectTrans != null)
{
triggerRectTrans.GetWorldCorners(triggerCorners);
}
else
{
// We're not using a trigger from a Canvas, so that means it's a regular world space game object.
// So, find the collider bounds of the object and use that for the four corners.
Collider coll = trigger.GetComponent <Collider>();
Vector3 center = coll.bounds.center;
Vector3 extents = coll.bounds.extents;
Vector3 frontBottomLeftCorner = new Vector3(center.x - extents.x, center.y - extents.y, center.z - extents.z);
Vector3 frontTopLeftCorner = new Vector3(center.x - extents.x, center.y + extents.y, center.z - extents.z);
Vector3 frontTopRightCorner = new Vector3(center.x + extents.x, center.y + extents.y, center.z - extents.z);
Vector3 frontBottomRightCorner = new Vector3(center.x + extents.x, center.y - extents.y, center.z - extents.z);
triggerCorners[0] = camera.WorldToScreenPoint(frontBottomLeftCorner);
triggerCorners[1] = camera.WorldToScreenPoint(frontTopLeftCorner);
triggerCorners[2] = camera.WorldToScreenPoint(frontTopRightCorner);
triggerCorners[3] = camera.WorldToScreenPoint(frontBottomRightCorner);
}
// Set the initial tooltip position.
tooltip.SetPosition(trigger.tipPosition, trigger.tooltipStyle, triggerCorners, tooltip.BackgroundImage, tooltip.RectTransform, canvas, camera);
// If overflow protection is disabled, exit.
if (!TooltipManager.Instance.overflowProtection)
{
return;
}
// Check for overflow.
Vector3[] tooltipCorners = new Vector3[4];
tooltip.RectTransform.GetWorldCorners(tooltipCorners);
if (canvas.renderMode == RenderMode.ScreenSpaceCamera || canvas.renderMode == RenderMode.WorldSpace)
{
for (int i = 0; i < tooltipCorners.Length; i++)
{
tooltipCorners[i] = RectTransformUtility.WorldToScreenPoint(camera, tooltipCorners[i]);
}
}
else if (canvas.renderMode == RenderMode.ScreenSpaceOverlay)
{
for (int i = 0; i < tooltipCorners.Length; i++)
{
tooltipCorners[i] = RectTransformUtility.WorldToScreenPoint(null, tooltipCorners[i]);
}
}
Rect screenRect = new Rect(0, 0, Screen.width, Screen.height);
TooltipOverflow overflow = new TooltipOverflow
{
BottomLeftCorner = !screenRect.Contains(tooltipCorners[0]),
// is the tooltip out of bounds on the Bottom Left?
TopLeftCorner = !screenRect.Contains(tooltipCorners[1]),
// is the tooltip out of bounds on the Top Left?
TopRightCorner = !screenRect.Contains(tooltipCorners[2]),
// is the tooltip out of bounds on the Top Right?
BottomRightCorner = !screenRect.Contains(tooltipCorners[3])
// is the tooltip out of bounds on the Bottom Right?
};
// If the tooltip overflows its boundary rectange, reposition it.
if (overflow.IsAny)
{
tooltip.SetPosition(overflow.SuggestNewPosition(trigger.tipPosition), trigger.tooltipStyle,
triggerCorners, tooltip.BackgroundImage, tooltip.RectTransform, canvas, camera);
}
}
