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If using a mouse, handle piece dragging like lichess web. #59

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merged 1 commit into from
Nov 19, 2024
Merged

If using a mouse, handle piece dragging like lichess web. #59

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41 changes: 29 additions & 12 deletions lib/src/widgets/board.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -519,11 +519,18 @@ class _BoardState extends State<Chessboard> {
}

/// Returns the position of the square target during drag as a global offset.
Offset? _squareTargetGlobalOffset(Offset localPosition, RenderBox box) {
Offset? _squareTargetGlobalOffset(
Offset localPosition, RenderBox box, bool isMousePointer) {
final square = widget.offsetSquare(localPosition);
if (square == null) return null;
final localOffset = widget.squareOffset(square);
final tmpOffset = box.localToGlobal(localOffset);
if (isMousePointer) {
return Offset(
tmpOffset.dx,
tmpOffset.dy,
);
}
return Offset(
(widget.settings.border?.width ?? 0) +
tmpOffset.dx -
Expand Down Expand Up @@ -691,9 +698,12 @@ class _BoardState extends State<Chessboard> {
_onDragStart(_currentPointerDownEvent!);
}

final bool isMousePointer = details.kind == PointerDeviceKind.mouse;

_dragAvatar?.update(details);
_dragAvatar?.updateSquareTarget(
_squareTargetGlobalOffset(details.localPosition, _renderBox!),
_squareTargetGlobalOffset(
details.localPosition, _renderBox!, isMousePointer),
);
}

Expand Down Expand Up @@ -804,6 +814,7 @@ class _BoardState extends State<Chessboard> {
final square = widget.offsetSquare(origin.localPosition);
final piece = square != null ? pieces[square] : null;
final feedbackSize = widget.squareSize * widget.settings.dragFeedbackScale;
final bool isMousePointer = origin.kind == PointerDeviceKind.mouse;
if (square != null &&
piece != null &&
(_isMovable(piece) || _isPremovable(piece))) {
Expand All @@ -815,24 +826,30 @@ class _BoardState extends State<Chessboard> {
final dragFeedbackOffsetY = (_isUpsideDown(piece.color) ? -1 : 1) *
widget.settings.dragFeedbackOffset.dy;

final Offset mouseOffset = Offset(
((widget.settings.dragFeedbackOffset.dx - 1) * feedbackSize) / 2,
((dragFeedbackOffsetY - 1) * feedbackSize) / 4,
);
final Offset touchOffset = Offset(
((widget.settings.dragFeedbackOffset.dx - 1) * feedbackSize) / 2,
((dragFeedbackOffsetY - 1) * feedbackSize) / 2,
);

_dragAvatar = _DragAvatar(
overlayState: Overlay.of(context, debugRequiredFor: widget),
initialPosition: origin.position,
initialTargetPosition:
_squareTargetGlobalOffset(origin.localPosition, _renderBox!),
initialTargetPosition: _squareTargetGlobalOffset(
origin.localPosition, _renderBox!, isMousePointer),
squareTargetFeedback: Container(
width: widget.squareSize * 2,
height: widget.squareSize * 2,
decoration: const BoxDecoration(
width: isMousePointer ? widget.squareSize : widget.squareSize * 2,
height: isMousePointer ? widget.squareSize : widget.squareSize * 2,
decoration: BoxDecoration(
color: Color(0x33000000),
shape: BoxShape.circle,
shape: isMousePointer ? BoxShape.rectangle : BoxShape.circle,
),
),
pieceFeedback: Transform.translate(
offset: Offset(
((widget.settings.dragFeedbackOffset.dx - 1) * feedbackSize) / 2,
((dragFeedbackOffsetY - 1) * feedbackSize) / 2,
),
offset: isMousePointer ? mouseOffset : touchOffset,
child: PieceWidget(
piece: piece,
size: feedbackSize,
Expand Down
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