SpriteText.GetNearestInsertionPoint C# (CSharp) Method

	public int GetNearestInsertionPoint(Vector3 point)
	{
		point = transform.InverseTransformPoint(point);

		// First find which row the click is nearest to:
		int rows = GetDisplayLineCount();

		// Will tell us where to start searching in our string
		int charOffset = 0;

		if(rows > 1)
		{
			float yDiff;
			float nearestY = float.PositiveInfinity;
			int nearestLine = 1;

			for(int i=1; i <= rows; ++i)
			{
				yDiff = point.y - (GetLineBaseline(rows, i) + BaseHeight * 0.5f);

				if(Mathf.Abs(yDiff) < nearestY)
				{
					nearestY = Mathf.Abs(yDiff);
					nearestLine = i;
				}
			}

			// Now find the offset into the string of the
			// start of the nearest line:
			for (int i = 0, lineCount = 1; i < displayString.Length && lineCount < nearestLine; ++i)
			{
				if (displayString[i] == '\n')
				{
					++lineCount;
					charOffset = i+1;
				}
			}
		}

		int insertionPt = charOffset;

		// Now start searching our desired range for the nearest
		// character:
		for (int i = charOffset; i < displayString.Length && displayString[i] != '\n'; ++i)
		{
			// Skip whitespace since we can't use its geometry:
			if (char.IsWhiteSpace(displayString[i]))
				continue;

			// Default to after this character:
			insertionPt = i+1;

			// Keep going until the center of the character is 
			// to the right of our point:
			int idx = i * 4;
			float centerX = vertices[idx].x + (0.5f * (vertices[idx + 2].x - vertices[idx].x));

			if (centerX >= point.x)
			{
				insertionPt = i;
				break;
			}
		}

		return insertionPt;
	}

    // 检测是否有超链接在
    HyperItemBase CheckHyperHover(RaycastHit hitInfo)
    {
        if (hitInfo.collider == null)
        {
            return(null);
        }

        // 防止移动到容器上误判为超链接之上
        UIScrollList list = hitInfo.collider.gameObject.GetComponent <UIScrollList>();

        if (list != null)
        {
            return(null);
        }

        SpriteText currTextItem = hitInfo.collider.gameObject.GetComponentInChildren <SpriteText>();

        if (currTextItem != null)
        {
            //string showText = currTextItem.Text.Replace("\0", "");
            int charIndex = currTextItem.GetNearestInsertionPoint(hitInfo.point);

            return(HyperLinkManager.Instance.GetHyperHover(currTextItem.DisplayString, charIndex));
        }
        return(null);
    }