backspaceToUnIndentTask function

ExecutionInstruction backspaceToUnIndentTask({ required SuperEditorContext editContext, required KeyEvent keyEvent, })

Implementation

ExecutionInstruction backspaceToUnIndentTask({
  required SuperEditorContext editContext,
  required KeyEvent keyEvent,
}) {
  if (keyEvent is! KeyDownEvent && keyEvent is! KeyRepeatEvent) {
    return ExecutionInstruction.continueExecution;
  }

  if (keyEvent.logicalKey != LogicalKeyboardKey.backspace) {
    return ExecutionInstruction.continueExecution;
  }

  final selection = editContext.composer.selection;
  if (selection == null) {
    return ExecutionInstruction.continueExecution;
  }

  if (selection.base.nodeId != selection.extent.nodeId) {
    // Selection spans nodes, so even if this selection includes a task,
    // it includes other stuff, too. So we can't treat this as a task indentation.
    return ExecutionInstruction.continueExecution;
  }

  final node = editContext.document.getNodeById(editContext.composer.selection!.extent.nodeId);
  if (node is! TaskNode) {
    return ExecutionInstruction.continueExecution;
  }
  if ((editContext.composer.selection!.extent.nodePosition as TextPosition).offset > 0) {
    // Backspace should only un-indent if the caret is at the start of the text.
    return ExecutionInstruction.continueExecution;
  }

  if (node.indent == 0) {
    // Can't un-indent any further.
    return ExecutionInstruction.continueExecution;
  }

  editContext.editor.execute([
    UnIndentTaskRequest(node.id),
  ]);

  return ExecutionInstruction.haltExecution;
}