/*---------------------------------------------------------------------------*

  Copyright (C) Nintendo.  All rights reserved.

  These coded instructions, statements, and computer programs contain
  proprietary information of Nintendo of America Inc. and/or Nintendo
  Company Ltd., and are protected by Federal copyright law.  They may
  not be disclosed to third parties or copied or duplicated in any form,
  in whole or in part, without the prior written consent of Nintendo.

 *---------------------------------------------------------------------------*/


////////////////////////////////////////////////////
//
// Scroll Bar functions
//
////////////////////////////////////////////////////
        
ScrollBar* ScrollBar::Add(const ScrollBar& item)
{
    ScrollBar* pItem = new ScrollBar(item);
    item.window->menuItems.push_back(pItem);
    return pItem;
}

	// Updates the scroll bar
bool ScrollBar::Update()
{
		// A draggable bar
	if (this->count <= this->max)
		return true;
		
	float sizeY = this->count - this->max;
	
	float offY = *this->pPos / sizeY;
	
	offY = (0.5 - offY) * (this->height - this->subHeight);
	
		// No longer selecting the bar!
	if (!PositivePressed())
		this->status = 0;
		
	if (this->status == 2)
	{
		offY = CursorY() - this->oldY;
		offY = 0.5 - offY / (this->height - this->subHeight);
		*this->pPos = offY * sizeY;

            // Clamp the values!
        if (*this->pPos >= this->count - this->max)
        {
            this->wasMax = true;
            *this->pPos = this->count - this->max;
        }
        
        if (*this->pPos <= 0)
            *this->pPos = 0;
		
		return false;
	}
	
	int status;
	
		// We don't care as much if the cursor isn't being triggered
	if (!PositiveTriggered())
		status = 1;
	else
		status = 2;
	
		// See if we just hit something
	if (CursorColliding(this->x, this->y + offY, this->width, this->subHeight))
	{
		this->status = status;
		
		if (status == 2)
			this->oldY = CursorY() - offY;
	}
	else
		this->status = 0;
        
    return (this->status == 0);
}

	// Draws the scroll bar
void ScrollBar::Draw()
{
		// If we WERE at the bottom, STAY at the bottom
	if (wasMax && oldPos == *pPos)
		*pPos = count - max;
	
	wasMax = false;

		// Clamp the values!
	if (*pPos >= count - max)
	{
		wasMax = true;
		*pPos = count - max;
	}
	
	if (*pPos <= 0)
		*pPos = 0;
		
		// A draggable bar
	if (count > max)
	{
		float sizeY = count - max;
		
		float offY = *pPos / sizeY;
		
		subHeight = height * (1.0 - (float)sizeY / count);
		
		if (subHeight < width)
			subHeight = width;
		
		offY = (0.5 - offY) * (height - subHeight);
		
		CVec4 color = WhiteDarker(status);
		DrawQuad(position, size, CVec4(1.0, 1.0, 1.0, 0.2));
		
		DrawQuad(CVec3(x, y + offY, z + 0.0001), CVec2(width, subHeight), color);
		
		DrawLine(CVec3(x - width / 2, y - height / 2, z + 0.0002), CVec2(0, height), CVec4(0, 0, 0));
	}
	
	oldPos = *pPos;
}
    
    // Resets the scroll bar's status
void ScrollBar::Reset()
{
    if (this->status > 0)
        this->status = 0;
}