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Features

• Introduce stateful widgets, i.e widgets that can take advantage of keeping some state around between two draw calls (#210 goes a bit more into the details).
• Allow a Table row to be selected.

// State initialization
let mut state = TableState::default();

// In the terminal.draw closure
let header = ["Col1", "Col2", "Col"];
let rows = [
  Row::Data(["Row11", "Row12", "Row13"].into_iter())
];
let table = Table::new(header.into_iter(), rows.into_iter());
f.render_stateful_widget(table, area, &mut state);

// In response to some event:
state.select(Some(1));

• Add a way to choose the type of border used to draw a block. You can now choose from plain, rounded, double and thick lines.
• Add a graph_type property on the Dataset of a Chart widget. By default it will be Scatter where the points are drawn as is. An other option is Line where a line will be draw between each consecutive points of the dataset.
• Style methods are now const, allowing you to initialize const Style objects.
• Improve control over whether the legend in the Chart widget is shown or not. You can now set custom constraints using Chart::hidden_legend_constraints.
• Add Table::header_gap to add some space between the header and the first row.
• Remove log from the dependencies
• Add a way to use a restricted set of unicode symbols in several widgets to improve portability in exchange of a degraded output. (see BarChart::bar_set, Sparkline::bar_set and Canvas::marker). You can check how the --enhanced-graphics flag is used in the demos.

Breaking Changes

• Widget::render has been deleted. You should now use Frame::render_widget to render a widget on the corresponding Frame. This makes the Widget implementation totally decoupled from the Frame.

// Before
Block::default().render(&mut f, size);

// After
let block = Block::default();
f.render_widget(block, size);

• Widget::draw has been renamed to Widget::render and the signature has been updated to reflect that widgets are consumable objects. Thus the method takes self instead of &mut self.

// Before
impl Widget for MyWidget {
  fn draw(&mut self, area: Rect, buf: &mut Buffer) {
  }
}

/// After
impl Widget for MyWidget {
  fn render(self, arera: Rect, buf: &mut Buffer) {
  }
}

• Widget::background has been replaced by Buffer::set_background

// Before
impl Widget for MyWidget {
  fn render(self, arera: Rect, buf: &mut Buffer) {
    self.background(area, buf, self.style.bg);
  }
}

// After
impl Widget for MyWidget {
  fn render(self, arera: Rect, buf: &mut Buffer) {
    buf.set_background(area, self.style.bg);
  }
}

• Update the Shape trait for objects that can be draw on a Canvas widgets. Instead of returning an iterator over its points, a Shape is given a Painter object that provides a paint as well as a get_point method. This gives the Shape more information about the surface it will be drawn to. In particular, this change allows the Line shape to use a more precise and efficient drawing algorithm (Bresenham's line algorithm).
• SelectableList has been deleted. You can now take advantage of the associated ListState of the List widget to select an item.

// Before
List::new(&["Item1", "Item2", "Item3"])
  .select(Some(1))
  .render(&mut f, area);

// After

// State initialization
let mut state = ListState::default();

// In the terminal.draw closure
let list = List::new(&["Item1", "Item2", "Item3"]);
f.render_stateful_widget(list, area, &mut state);

// In response to some events
state.select(Some(1));

• widgets::Marker has been moved to symbols::Marker

Breaking Changes

• Bump crossterm to 0.14.
• Add cross symbol to the symbols list.

Bug Fixes

• Use the value of title_style to style the title of Axis.

Changed

• Use Constraint instead of integers to specify the widths of the Table widget's columns. This will allow more responsive tables.

Table::new(header, row)
  .widths(&[15, 15, 10])
  .render(f, chunk);

becomes:

Table::new(header, row)
  .widths(&[
    Constraint::Length(15),
    Constraint::Length(15),
    Constraint::Length(10),
  ])
  .render(f, chunk);

• Bump crossterm to 0.13.
• Use Github Actions for CI (Travis and Azure Pipelines integrations have been deleted).

Added

• Add support for horizontal and vertical margins in Layout.

Fixed

• Avoid a division by zero when all values in a barchart are equal to 0.
• Fix the inverted cursor position in the curses backend.
• Ensure that the correct terminal size is returned when using the crossterm backend.
• Avoid highlighting the separator after the selected item in the Tabs widget.

Changed

• Update crossterm backend

Added

• Add a new curses backend (with Windows support thanks to pancurses).
• Add Backend::get_cursor and Backend::set_cursor methods to query and set the position of the cursor.
• Add more constructors to the Crossterm backend.
• Add a demo for all backends using a shared UI and application state.
• Add Ratio as a new variant of layout Constraint. It can be used to define exact ratios constraints.

Changed

• Add support for multiple modifiers on the same Style by changing Modifier from an enum to a bitflags struct.

So instead of writing:

let style = Style::default().modifier(Modifier::Italic);

one should use:

let style = Style::default().modifier(Modifier::ITALIC);
// or
let style = Style::default().modifier(Modifier::ITALIC | Modifier::BOLD);

Fixed

• Ensure correct behavoir of the alternate screens with the Crossterm backend.
• Fix out of bounds panic when two Buffer are merged.

Added

• Add a new canvas shape: Rectangle.
• Official support of Crossterm backend.
• Make it possible to choose the divider between Tabs.
• Add word wrapping on Paragraph.
• The gauge widget accepts a ratio (f64 between 0 and 1) in addition of a percentage.

Changed

• Upgrade to Rust 2018 edition.

Fixed

• Fix rendering of double-width characters.
• Fix race condition on the size of the terminal and expose a size that is safe to use when drawing through Frame::size.
• Prevent unsigned int overflow on large screens.

Changed

• show_cursor is called when Terminal is dropped if the cursor is hidden.

Changed

• Remove custom termion backends. This is motivated by the fact that termion structs are meant to be combined/wrapped to provide additional functionalities to the terminal (e.g AlternateScreen, Mouse support, ...). Thus providing exclusive types do not make a lot of sense and give a false hint that additional features cannot be used together. The recommended approach is now to create your own version of stdout:

let stdout = io::stdout().into_raw_mode()?;
let stdout = MouseTerminal::from(stdout);
let stdout = AlternateScreen::from(stdout);

and then to create the corresponding termion backend:

let backend = TermionBackend::new(stdout);

The resulting code is more verbose but it works with all combinations of additional termion features.