text-document

A text document structure and management for Rust

This model is thought as a backend for a text UI. TextDocument can't be modified directly by the user, only for setting the whole document with set_plain_text(...). The user must use a TextCursor using document.create_cursor() to make any change.

Document structure

Elements

• Frame: contains Block elements and other Frame elements, formatable with FrameFormat
• Block: contains Text elements or Image elements, formatable with BlockFormat
• Text: contains the actuel text, formatable with TextFormat
• Image: represent the position of an image, formatable with ImageFormat

All these items are encapsulated in its corresponding Element for ease of storage.

The simpler plain text

Frame
|- Block
   |- Text
|- Block
   |- Text

The more complex rich text

Frame
|- Block
   |- Text  --> I really lo
   |- Text  --> ve (imagine it Formatted in bold)
   |- Text  --> Rust
   |- Image
   |- Text
|- Frame
   |- Block
      |- Text
      |- Text
      |- Text
   |- Block
      |- Text
      |- Text
      |- Text
|- Block
   |- Image

Signaling changes

Each modification is signaled using callbacks. TextDocument offers different ways to make your code aware of any change:

• [TextDocument::add_text_change_callback()]

  Give the number of removed characters and number of added characters with the reference of a cursor position.

• [TextDocument::add_element_change_callback()]

  Give the modified element with the reason. If two direct children elements changed at the same time.

Examples

use text_document::{TextDocument, ChangeReason, MoveMode};

let mut document = TextDocument::new();

document.add_text_change_callback(|position, removed_characters, added_characters|{
  println!("position: {}, removed_characters: {}, added_characters: {}", position, removed_characters, added_characters);
} );

document.add_element_change_callback(|element, reason|{
  assert_eq!(element.uuid(), 0);
  assert_eq!(reason, ChangeReason::ChildrenChanged );
} );
document.set_plain_text("beginningend").unwrap();

let mut cursor = document.create_cursor();
cursor.set_position(9, MoveMode::MoveAnchor);
cursor.insert_plain_text("new\nplain_text\ntest");

  

License

Licensed under either of

• Apache License, Version 2.0 (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.