calcWindowPosition function

Future<Offset> calcWindowPosition(Size windowSize, Alignment alignment)

Where a window of windowSize has to sit to be alignment on the display the cursor is on, inside that display's work area.

Unlike 0.5.x this handles any Alignment, not only the nine constants.

Implementation

Future<Offset> calcWindowPosition(Size windowSize, Alignment alignment) async {
  final displayManager = nativeapi.DisplayManager.instance;
  final displays = displayManager.getAll();
  final cursorPosition = displayManager.getCursorPosition().toOffset();

  nativeapi.Display? currentDisplay;
  for (final display in displays) {
    final bounds = display.position.toOffset() & display.size.toSize();
    if (bounds.contains(cursorPosition)) {
      currentDisplay = display;
      break;
    }
  }
  currentDisplay ??= displayManager.getPrimary();
  if (currentDisplay == null) {
    return Offset.zero;
  }

  final workArea = currentDisplay.workArea.toRect();
  return Offset(
    workArea.left + (workArea.width - windowSize.width) * (alignment.x + 1) / 2,
    workArea.top +
        (workArea.height - windowSize.height) * (alignment.y + 1) / 2,
  );
}