performPaint method

@override void performPaint(Buffer buffer, Offset offset)

Hook for subclasses to implement actual painting.

Implementation

@override
void performPaint(Buffer buffer, Offset offset) {
  final split = widget as SplitPane;
  split._lastArea = Rect(offset.dx, offset.dy, size.width, size.height);
  final w = size.width;
  final h = size.height;
  if (w <= 0 || h <= 0) return;

  final dividerPos = split._dividerX;

  if (split.direction == LayoutDirection.horizontal) {
    if (dividerPos > 0 && childElement1 != null) {
      childElement1!.paint(buffer, offset + childElement1!.relativeOffset);
    }

    for (var y = 0; y < h; y++) {
      buffer.setAttributes(
        offset.dx + dividerPos,
        offset.dy + y,
        char: split.dividerChar,
        fg: split.dividerStyle.foreground?.argb ?? 0,
        bg: split.dividerStyle.background?.argb ?? 0,
        modifiers: split.dividerStyle.modifiers,
      );
    }

    final child2Width = w - dividerPos - 1;
    if (child2Width > 0 && childElement2 != null) {
      childElement2!.paint(buffer, offset + childElement2!.relativeOffset);
    }
  } else {
    if (dividerPos > 0 && childElement1 != null) {
      childElement1!.paint(buffer, offset + childElement1!.relativeOffset);
    }

    for (var x = 0; x < w; x++) {
      buffer.setAttributes(
        offset.dx + x,
        offset.dy + dividerPos,
        char: split.dividerChar,
        fg: split.dividerStyle.foreground?.argb ?? 0,
        bg: split.dividerStyle.background?.argb ?? 0,
        modifiers: split.dividerStyle.modifiers,
      );
    }

    final child2Height = h - dividerPos - 1;
    if (child2Height > 0 && childElement2 != null) {
      childElement2!.paint(buffer, offset + childElement2!.relativeOffset);
    }
  }
}