Function IsGoodAutoPlace2

src/window.cpp:1578–1609

* Decide whether a given rectangle is a good place to open a mostly visible new window. * The new window should be mostly within screen borders, and not overlap with another already * existing window (except for the main window in the background). * @param left Left edge of the rectangle * @param top Top edge of the rectangle * @param width Width of the rectangle * @param height He

 * @return Boolean indication that the rectangle is a good place for the new window
 */
static bool IsGoodAutoPlace2(int left, int top, int width, int height, int toolbar_y, Point &pos)
{
	bool rtl = _current_text_dir == TD_RTL;

	/* Left part of the rectangle may be at most 1/4 off-screen,
	 * right part of the rectangle may be at most 1/2 off-screen
	 */
	if (rtl) {
		if (left < -(width >> 1) || left > _screen.width - (width >> 2)) return false;
	} else {
		if (left < -(width >> 2) || left > _screen.width - (width >> 1)) return false;
	}

	/* Bottom part of the rectangle may be at most 1/4 off-screen */
	if (top < toolbar_y || top > _screen.height - (height >> 2)) return false;

	/* Make sure it is not obscured by any window. */
	for (const Window *w : Window::Iterate()) {
		if (w->window_class == WC_MAIN_WINDOW) continue;

		if (left + width > w->left &&
				w->left + w->width > left &&
				top + height > w->top &&
				w->top + w->height > top) {
			return false;
		}
	}

	pos.x = left;
	pos.y = top;
	return true;
}

/**
 * Find a good place for opening a new window of a given width and height.