Method drawThumb

src/Interface/ScrollBar.cpp:265–328

* Draws the thumb (button) as a hollow square. */

 * Draws the thumb (button) as a hollow square.
 */
void ScrollBar::drawThumb()
{
	double scale = (double)getHeight() / _list->getRows();
	_thumbRect.x = 0;
	_thumbRect.y = (int)floor(_list->getScroll() * scale);
	_thumbRect.w = _thumb->getWidth();
	_thumbRect.h = (int)ceil(_list->getVisibleRows() * scale);
	
	// Draw base button
	_thumb->clear();
	_thumb->lock();

	SDL_Rect square = _thumbRect;
	int color = _color + 2;

	square.w--;
	square.h--;

	_thumb->drawRect(&square, color);

	square.x++;
	square.y++;
	color = _color + 5;

	_thumb->drawRect(&square, color);

	square.w--;
	square.h--;
	color = _color + 4;

	_thumb->drawRect(&square, color);

	_thumb->setPixel(_thumbRect.x, _thumbRect.y, _color + 1);
	_thumb->setPixel(_thumbRect.x, _thumbRect.y + _thumbRect.h - 1, _color + 4);
	_thumb->setPixel(_thumbRect.x + _thumbRect.w - 1, _thumbRect.y, _color + 4);

	// Hollow it out
	color = _color + 5;

	square.x++;
	square.y++;
	square.w-=3;
	square.h-=3;

	_thumb->drawRect(&square, color);

	square.x++;
	square.y++;
	color = _color + 2;

	_thumb->drawRect(&square, color);

	square.w--;
	square.h--;
	color = 0;

	_thumb->drawRect(&square, color);