Function PositionWindow

src/window.cpp:3445–3461

* (Re)position a window at the screen. * @param w Window structure of the window, may also be \c nullptr. * @param clss The class of the window to position. * @param setting The actual setting used for the window's position. * @return X coordinate of left edge of the repositioned window. */

 * @return X coordinate of left edge of the repositioned window.
 */
static int PositionWindow(Window *w, WindowClass clss, int setting)
{
	if (w == nullptr || w->window_class != clss) {
		w = FindWindowById(clss, 0);
	}
	if (w == nullptr) return 0;

	int old_left = w->left;
	switch (setting) {
		case 1:  w->left = (_screen.width - w->width) / 2; break;
		case 2:  w->left = _screen.width - w->width; break;
		default: w->left = 0; break;
	}
	if (w->viewport != nullptr) w->viewport->left += w->left - old_left;
	AddDirtyBlock(0, w->top, _screen.width, w->top + w->height); // invalidate the whole row
	return w->left;
}

/**
 * (Re)position main toolbar window at the screen.