Struct FlowModel 

pub struct FlowModel<'a> { /* private fields */ }

The paragraphs under a root in a content tree, for one frame’s editing.

Implementations

impl<'a> FlowModel<'a>

pub fn new( content: &'a mut Element, styles: &'a mut Styles, root: Vec<usize>, editing: &'a mut Editing, ) -> Self

The paragraphs under the element at a path in a content tree, whose document’s styles are styles.

pub fn within(self, scope: Vec<usize>) -> Self

Keep to the paragraphs under one element beneath the root, so that moving and joining never leave it: a slide’s label does not run on into the next shape.

Trait Implementations

impl Model for FlowModel<'_>

type Paragraph = Vec<usize>

Names a paragraph. An edit may change what any paragraph is called, so the editor holds only the positions the model hands back.

fn text(&self, paragraph: &Vec<usize>) -> Option<String>

The paragraph’s text, with a line break as '\n' and a tab as '\t'. None when the model has no such paragraph.

fn next(&self, paragraph: &Vec<usize>) -> Option<Vec<usize>>

The editable paragraph after this one in document order.

fn previous(&self, paragraph: &Vec<usize>) -> Option<Vec<usize>>

The editable paragraph before this one in document order.

fn first(&self) -> Option<Vec<usize>>

The first editable paragraph, None when there is none.

fn last(&self) -> Option<Vec<usize>>

The last editable paragraph, None when there is none.

fn marked( &self, from: &Position<Vec<usize>>, to: &Position<Vec<usize>>, mark: Mark, ) -> Option<bool>

Whether the text from one position to another carries a mark: Some when all of it says the same, None when it differs. Two positions that are the same answer for the text typed there would take its formatting from. A model that keeps no formatting leaves this as it is, which says nothing is marked, and refuses Edit::Format.

fn apply( &mut self, edit: Edit<'_, Vec<usize>>, new_step: bool, ) -> Option<Position<Vec<usize>>>

Make an edit, and answer where the caret stands after it: after the replacing text, at the start of the second half of a split, or for a format at the end of the formatted text. None refuses the edit and leaves the document as it was.