insertStyleProperty method

void insertStyleProperty(StylePropertyOperation op)

Adds a style-property to the current selection of text. If there is an existing tag around the exact selection, the property gets added to this tag. A -tag will be created otherwise.

Implementation

void insertStyleProperty(StylePropertyOperation op) {
  _cache();

  op.setSelection(selection);

  NodeV2 tree = Parser().parse(text);

  int opStart = op.start!;
  int opEnd = op.end!;

  // pass 1: split only partly affected nodes into new simple nodes
  List<SimpleNode> affectedNodes = tree.getNodesInSelection(opStart, opEnd);
  _splitOnlyPartiallySelectedNodes(affectedNodes, opStart, opEnd);

  // pass 2: apply new tag to all (now only full-selection) nodes
  List<SimpleNode> changedNodes = [];
  affectedNodes = tree.getNodesInSelection(opStart, opEnd);

  for (SimpleNode affectedNode in affectedNodes) {
    NodeV2 affectedParent = affectedNode.parent!;

    // selection fully contains a node -> insert the attribute in its parent
    if (affectedNode.isFullySelected(opStart, opEnd)) {
      changedNodes.add(affectedNode);

      if (affectedParent.startTagName.isNotEmpty &&
          affectedParent.isFullySelected(opStart, opEnd)) {
        int offset = _extendNodeWithStyle(affectedParent, op);

        // apply the offset to all nodes and the selection end
        _applyOffsetToNodes(affectedNode.root, offset, affectedNode);
        opEnd += offset;
      } else {
        int offset = _insertTagNodeBetween(affectedParent, affectedNode,
            TagOperation('<span $op>', '</span>', 'span'));

        // apply the offset to all nodes and the selection end
        _applyOffsetToNodes(affectedNode.root, offset, affectedNode);
        opEnd += offset;
      }
    }
  }

  if (changedNodes.isNotEmpty) {
    int iStart = changedNodes.map((e) => e.textIndexStart).reduce(min);
    int iEnd = changedNodes.map((e) => e.textIndexEnd).reduce(max) + 1;

    if (editorFocusNode != null) {
      editorFocusNode!.requestFocus();
      value = value.copyWith(
        text: tree.toHtml(),
        selection: TextSelection(baseOffset: iStart, extentOffset: iEnd),
      );
    }
  } else {
    value = value.copyWith(
      text: tree.toHtml(),
    );
  }
}