public override void draw(Graphics graphics, float parentAlpha)
{
if (_widget == null)
{
return;
}
update();
validate();
// setup transform for this group.
if (transform)
{
applyTransform(graphics, computeTransform());
}
if (_scrollX)
{
_hKnobBounds.X = _hScrollBounds.X + (int)((_hScrollBounds.Width - _hKnobBounds.Width) * getVisualScrollPercentX());
}
if (_scrollY)
{
_vKnobBounds.Y = _vScrollBounds.Y + (int)((_vScrollBounds.Height - _vKnobBounds.Height) * getVisualScrollPercentY());
}
// calculate the widget's position depending on the scroll state and available widget area.
float eleY = _widgetAreaBounds.Y;
if (!_scrollY)
{
eleY -= _maxY;
}
else
{
eleY -= _visualAmountY;
}
float eleX = _widgetAreaBounds.Y;
if (_scrollX)
{
eleX -= (int)_visualAmountX;
}
if (!_fadeScrollBars && _scrollbarsOnTop)
{
if (_scrollX && _hScrollOnBottom)
{
var scrollbarHeight = 0f;
if (_style.hScrollKnob != null)
{
scrollbarHeight = _style.hScrollKnob.minHeight;
}
if (_style.hScroll != null)
{
scrollbarHeight = Math.Max(scrollbarHeight, _style.hScroll.minHeight);
}
eleY += scrollbarHeight;
}
if (_scrollY && !_vScrollOnRight)
{
var scrollbarWidth = 0f;
if (_style.hScrollKnob != null)
{
scrollbarWidth = _style.hScrollKnob.minWidth;
}
if (_style.hScroll != null)
{
scrollbarWidth = Math.Max(scrollbarWidth, _style.hScroll.minWidth);
}
eleX += scrollbarWidth;
}
}
_widget.setPosition(eleX, eleY);
if (_widget is ICullable)
{
var cull = new Rectangle(
(int)(-_widget.getX() + _widgetAreaBounds.X),
(int)(-_widget.getY() + _widgetAreaBounds.Y),
_widgetAreaBounds.Width,
_widgetAreaBounds.Height);
((ICullable)_widget).setCullingArea(cull);
}
// draw the background
var color = getColor();
color = new Color(color, (int)(color.A * parentAlpha));
if (_style.background != null)
{
_style.background.draw(graphics, 0, 0, getWidth(), getHeight(), color);
}
// caculate the scissor bounds based on the batch transform, the available widget area and the camera transform. We need to
// project those to screen coordinates for OpenGL to consume.
var scissor = ScissorStack.calculateScissors(stage?.camera, graphics.batcher.transformMatrix, _widgetAreaBounds);
if (ScissorStack.pushScissors(scissor))
{
graphics.batcher.enableScissorTest(true);
drawChildren(graphics, parentAlpha);
graphics.batcher.enableScissorTest(false);
ScissorStack.popScissors();
}
// render scrollbars and knobs on top
var alpha = (float)color.A;
color.A = (byte)(alpha * (_fadeAlpha / _fadeAlphaSeconds));
if (_scrollX && _scrollY)
{
if (_style.corner != null)
{
_style.corner.draw(graphics, _hScrollBounds.X + _hScrollBounds.Width, _hScrollBounds.Y, _vScrollBounds.Width, _vScrollBounds.Y, color);
}
}
if (_scrollX)
{
if (_style.hScroll != null)
{
_style.hScroll.draw(graphics, _hScrollBounds.X, _hScrollBounds.Y, _hScrollBounds.Width, _hScrollBounds.Height, color);
}
if (_style.hScrollKnob != null)
{
_style.hScrollKnob.draw(graphics, _hKnobBounds.X, _hKnobBounds.Y, _hKnobBounds.Width, _hKnobBounds.Height, color);
}
}
if (_scrollY)
{
if (_style.vScroll != null)
{
_style.vScroll.draw(graphics, _vScrollBounds.X, _vScrollBounds.Y, _vScrollBounds.Width, _vScrollBounds.Height, color);
}
if (_style.vScrollKnob != null)
{
_style.vScrollKnob.draw(graphics, _vKnobBounds.X, _vKnobBounds.Y, _vKnobBounds.Width, _vKnobBounds.Height, color);
}
}
if (transform)
{
resetTransform(graphics);
}
}
