calcWindowPosition function

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

Implementation

Future<Offset> calcWindowPosition(
  Size windowSize,
  Alignment alignment,
) async {
  Display primaryDisplay = await screenRetriever.getPrimaryDisplay();
  List<Display> allDisplays = await screenRetriever.getAllDisplays();
  Offset cursorScreenPoint = await screenRetriever.getCursorScreenPoint();

  Display currentDisplay = allDisplays.firstWhere(
    (display) => Rect.fromLTWH(
      display.visiblePosition!.dx,
      display.visiblePosition!.dy,
      display.size.width,
      display.size.height,
    ).contains(cursorScreenPoint),
    orElse: () => primaryDisplay,
  );

  num visibleWidth = currentDisplay.size.width;
  num visibleHeight = currentDisplay.size.height;
  num visibleStartX = 0;
  num visibleStartY = 0;

  if (currentDisplay.visibleSize != null) {
    visibleWidth = currentDisplay.visibleSize!.width;
    visibleHeight = currentDisplay.visibleSize!.height;
  }
  if (currentDisplay.visiblePosition != null) {
    visibleStartX = currentDisplay.visiblePosition!.dx;
    visibleStartY = currentDisplay.visiblePosition!.dy;
  }
  Offset position = const Offset(0, 0);

  if (alignment == Alignment.topLeft) {
    position = Offset(
      visibleStartX + 0,
      visibleStartY + 0,
    );
  } else if (alignment == Alignment.topCenter) {
    position = Offset(
      visibleStartX + (visibleWidth / 2) - (windowSize.width / 2),
      visibleStartY + 0,
    );
  } else if (alignment == Alignment.topRight) {
    position = Offset(
      visibleStartX + visibleWidth - windowSize.width,
      visibleStartY + 0,
    );
  } else if (alignment == Alignment.centerLeft) {
    position = Offset(
      visibleStartX + 0,
      visibleStartY + ((visibleHeight / 2) - (windowSize.height / 2)),
    );
  } else if (alignment == Alignment.center) {
    position = Offset(
      visibleStartX + (visibleWidth / 2) - (windowSize.width / 2),
      visibleStartY + ((visibleHeight / 2) - (windowSize.height / 2)),
    );
  } else if (alignment == Alignment.centerRight) {
    position = Offset(
      visibleStartX + visibleWidth - windowSize.width,
      visibleStartY + ((visibleHeight / 2) - (windowSize.height / 2)),
    );
  } else if (alignment == Alignment.bottomLeft) {
    position = Offset(
      visibleStartX + 0,
      visibleStartY + (visibleHeight - windowSize.height),
    );
  } else if (alignment == Alignment.bottomCenter) {
    position = Offset(
      visibleStartX + (visibleWidth / 2) - (windowSize.width / 2),
      visibleStartY + (visibleHeight - windowSize.height),
    );
  } else if (alignment == Alignment.bottomRight) {
    position = Offset(
      visibleStartX + visibleWidth - windowSize.width,
      visibleStartY + (visibleHeight - windowSize.height),
    );
  } else {
    final left = (visibleWidth - windowSize.width) / 2 +
        alignment.x * ((visibleWidth - windowSize.width) / 2);
    final top = (visibleHeight - windowSize.height) / 2 +
        alignment.y * ((visibleHeight - windowSize.height) / 2);
    position = Offset(
      visibleStartX + left,
      visibleStartY + top,
    );
  }
  return position;
}