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super_text_layout

README.md

Super Text Layout
Configurable, composable, extensible text display for Flutter.

Flutter lacks a useful mechanism for painting custom decorations around text. If you want to paint custom text selections, highlights, carets, or any other decoration that depends on text layout, then super_text_layout is a package you need to use!

SuperTextWithSelection

Use the SuperTextWithSelection widget when you want to paint text with traditional user selections.

SuperTextWithSelection supports single-user and multi-user text selections.

// Single-user selection
Widget build(context) {
  return SuperTextWithSelection.single(
    richText: myText,
    userSelection: UserSelection(
      highlightStyle: myHighlightStyle,
      caretStyle: myCaretStyle,
      selection: myTextSelection,
    ),
  );
}

// Multi-user selection
Widget build(context) {
  return SuperTextWithSelection.multi(
    richText: _text,
    userSelections: [
      UserSelection(
        highlightStyle: _primaryHighlightStyle,
        caretStyle: _primaryCaretStyle,
        selection: const TextSelection(baseOffset: 11, extentOffset: 21),
      ),
      UserSelection(
        highlightStyle: _johnHighlightStyle,
        caretStyle: _johnCaretStyle,
        selection: const TextSelection(baseOffset: 58, extentOffset: 65),
      ),
      UserSelection(
        highlightStyle: _sallyHighlightStyle,
        caretStyle: _sallyCaretStyle,
        selection: const TextSelection(baseOffset: 79, extentOffset: 120),
      ),
    ],
  );
}

SuperText

The SuperText widget is the workhorse in the super_text package. It provides a platform, upon which you can build custom text decorations.

SuperText renders rich text, like you're used to, but then it allows you to paint a UI beneath the text, and above the text. In those layers you can paint things like selection highlights, carets, user names, etc.

Widget build(context) {
  // Implement a standard highlight   caret user selection,
  // using SuperText.
  return SuperText(
    richText: _text,
    layerAboveBuilder: (context, textLayout) {
      return Stack(
        children: [
          // Here you can paint anything you want, and you can use the
          // provided textLayout to position your UI based on lines and
          // characters in the text.
          TextLayoutCaret(
            textLayout: textLayout,
            style: myCaretStyle,
            position: mySelection.extent,
          ),
        ],
      );
    },
    layerBeneathBuilder: (context, textLayout) {
      return Stack(
        children: [
          // Here you can paint anything you want, and you can use the
          // provided textLayout to position your UI based on lines and
          // characters in the text.
          TextLayoutSelectionHighlight(
            textLayout: textLayout,
            style: myHighlightStyle,
            selection: mySelection,
          ),
        ],
      );
    },
  );
}