render method

@override void render(Buffer buffer, Rect area)

Renders the widget onto the provided buffer within the specified area.

Implementation

@override
void render(Buffer buffer, Rect area) {
  _lastArea = area;
  final w = area.width;
  final h = area.height;
  if (w <= 0 || h <= 0) return;

  _initLimits();
  final totalSize = direction == LayoutDirection.horizontal ? w : h;

  // 1. Calculate raw divider position based on constraints
  int dividerPos = _calculateDividerPos(totalSize);

  // 2. Solve min/max limits
  int minW1 = _origMin1 ?? 0;
  int maxW1 = _origMax1 ?? (totalSize - 1);
  if (_origMin2 != null) {
    maxW1 = min(maxW1, totalSize - _origMin2! - 1);
  }
  if (_origMax2 != null) {
    minW1 = max(minW1, totalSize - _origMax2! - 1);
  }
  minW1 = minW1.clamp(0, totalSize - 1);
  maxW1 = maxW1.clamp(0, totalSize - 1);
  if (minW1 > maxW1) minW1 = maxW1;

  dividerPos = dividerPos.clamp(minW1, maxW1);
  _dividerX = dividerPos;

  if (direction == LayoutDirection.horizontal) {
    // Render child1
    final child1Area = Rect(area.x, area.y, dividerPos, h);
    if (dividerPos > 0) {
      final vp1 = Viewport(buffer, child1Area);
      child1.render(vp1, Rect(0, 0, dividerPos, h));
    }

    // Render Divider
    for (var y = 0; y < h; y++) {
      final cell = buffer.getCell(area.x + dividerPos, area.y + y);
      if (cell != null) {
        cell.char = dividerChar;
        cell.style = dividerStyle;
      }
    }

    // Render child2
    final child2Width = w - dividerPos - 1;
    final child2Area = Rect(area.x + dividerPos + 1, area.y, child2Width, h);
    if (child2Width > 0) {
      final vp2 = Viewport(buffer, child2Area);
      child2.render(vp2, Rect(0, 0, child2Width, h));
    }
  } else {
    // Vertical
    // Render child1
    final child1Area = Rect(area.x, area.y, w, dividerPos);
    if (dividerPos > 0) {
      final vp1 = Viewport(buffer, child1Area);
      child1.render(vp1, Rect(0, 0, w, dividerPos));
    }

    // Render Divider
    for (var x = 0; x < w; x++) {
      final cell = buffer.getCell(area.x + x, area.y + dividerPos);
      if (cell != null) {
        cell.char = dividerChar;
        cell.style = dividerStyle;
      }
    }

    // Render child2
    final child2Height = h - dividerPos - 1;
    final child2Area = Rect(area.x, area.y + dividerPos + 1, w, child2Height);
    if (child2Height > 0) {
      final vp2 = Viewport(buffer, child2Area);
      child2.render(vp2, Rect(0, 0, w, child2Height));
    }
  }
}