Method UpdateViewportCoordinates

src/widget.cpp:2430–2442

* Update the position and size of the viewport (after eg a resize). * @param w Window owning the viewport. */

 * @param w Window owning the viewport.
 */
void NWidgetViewport::UpdateViewportCoordinates(Window *w)
{
	if (w->viewport == nullptr) return;

	Viewport &vp = *w->viewport;
	vp.left = w->left + this->pos_x;
	vp.top  = w->top + this->pos_y;
	vp.width  = this->current_x;
	vp.height = this->current_y;

	vp.virtual_width  = ScaleByZoom(vp.width, vp.zoom);
	vp.virtual_height = ScaleByZoom(vp.height, vp.zoom);
}

/**
 * Compute the row of a scrolled widget that a user clicked in.