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Breaking Changes

This document contains a list of breaking changes in each version and some notes to help migrate between versions. It is compiled manually from the commit history and changelog. We also tag PRs on GitHub with a breaking change label.

Summary

This is a quick summary of the sections below:

  • v0.26.0
    • Flex::Start is the new default flex mode for Layout
    • patch_style & reset_style now consume and return Self
    • Removed deprecated Block::title_on_bottom
    • Line now has an extra style field which applies the style to the entire line
    • Block style methods cannot be created in a const context
    • Tabs::new() now accepts IntoIterator<Item: Into<Line<'a>>>
    • Table::new now accepts IntoIterator<Item: Into<Row<'a>>>.
  • v0.25.0
    • Removed Axis::title_style and Buffer::set_background
    • List::new() now accepts IntoIterator<Item = Into<ListItem<'a>>>
    • Table::new() now requires specifying the widths
    • Table::widths() now accepts IntoIterator<Item = AsRef<Constraint>>
    • Layout::new() now accepts direction and constraint parameters
    • The default Tabs::highlight_style is now Style::new().reversed()
  • v0.24.0
    • MSRV is now 1.70.0
    • ScrollbarState: position, content_length, and viewport_content_length are now usize
    • BorderType: line_symbols is now border_symbols and returns symbols::border::set
    • Frame<'a, B: Backend> is now Frame<'a>
    • Stylize shorthands for String now consume the value and return Span<'static>
    • Spans is removed
  • v0.23.0
    • Scrollbar: track_symbol now takes Option<&str>
    • Scrollbar: symbols moved to symbols module
    • MSRV is now 1.67.0
  • v0.22.0
    • serde representation of Borders and Modifiers has changed
  • v0.21.0
    • MSRV is now 1.65.0
    • terminal::ViewPort is now an enum
    • "".as_ref() must be annotated to implement Into<Text<'a>>
    • Marker::Block renders as a block char instead of a bar char
  • v0.20.0
    • MSRV is now 1.63.0
    • List no longer ignores empty strings

v0.26.0

Flex::Start is the new default flex mode for Layout (#881)

Previously, constraints would stretch to fill all available space, violating constraints if necessary.

With v0.26.0, Flex modes are introduced, and the default is Flex::Start, which will align areas associated with constraints to be beginning of the area. With v0.26.0, additionally, Min constraints grow to fill excess space. These changes will allow users to build layouts more easily.

With v0.26.0, users will most likely not need to change what constraints they use to create existing layouts with Flex::Start. However, to get old behavior, use Flex::Legacy.

- let rects = Layout::horizontal([Length(1), Length(2)]).split(area);
// becomes
+ let rects = Layout::horizontal([Length(1), Length(2)]).flex(Flex::Legacy).split(area);

Table::new() now accepts IntoIterator<Item: Into<Row<'a>>> (#774)

Previously, Table::new() accepted IntoIterator<Item=Row<'a>>. The argument change to IntoIterator<Item: Into<Row<'a>>>, This allows more flexible types from calling scopes, though it can some break type inference in the calling scope for empty containers.

This can be resolved either by providing an explicit type (e.g. Vec::<Row>::new()), or by using Table::default().

- let table = Table::new(vec![], widths);
// becomes
+ let table = Table::default().widths(widths);

Tabs::new() now accepts IntoIterator<Item: Into<Line<'a>>> (#776)

Previously, Tabs::new() accepted Vec<T> where T: Into<Line<'a>>. This allows more flexible types from calling scopes, though it can break some type inference in the calling scope.

This typically occurs when collecting an iterator prior to calling Tabs::new, and can be resolved by removing the call to .collect().

- let tabs = Tabs::new((0.3).map(|i| format!("{i}")).collect());
// becomes
+ let tabs = Tabs::new((0.3).map(|i| format!("{i}")));

Table::default() now sets segment_size to None and column_spacing to (#751)

The default() implementation of Table now sets the column_spacing field to 1 and the segment_size field to SegmentSize::None. This will affect the rendering of a small amount of apps.

To use the previous default values, call table.segment_size(Default::default()) and table.column_spacing(0).

patch_style & reset_style now consumes and returns Self (#754)

Previously, patch_style and reset_style in Text, Line and Span were using a mutable reference to Self. To be more consistent with the rest of ratatui, which is using fluent setters, these now take ownership of Self and return it.

The following example shows how to migrate for Line, but the same applies for Text and Span.

- let mut line = Line::from("foobar");
- line.patch_style(style);
// becomes
+ let line = Line::new("foobar").patch_style(style);

Remove deprecated Block::title_on_bottom (#757)

Block::title_on_bottom was deprecated in v0.22. Use Block::title and Title::position instead.

- block.title("foobar").title_on_bottom();
+ block.title(Title::from("foobar").position(Position::Bottom));

Block style methods cannot be used in a const context (#720)

Previously the style(), border_style() and title_style() methods could be used to create a Block in a constant context. These now accept Into<Style> instead of Style. These methods no longer can be called from a constant context.

Line now has a style field that applies to the entire line (#708)

Previously the style of a Line was stored in the Spans that make up the line. Now the Line itself has a style field, which can be set with the Line::styled method. Any code that creates Lines using the struct initializer instead of constructors will fail to compile due to the added field. This can be easily fixed by adding ..Default::default() to the field list or by using a constructor method (Line::styled(), Line::raw()) or conversion method (Line::from()).

Each Span contained within the line will no longer have the style that is applied to the line in the Span::style field.

  let line = Line {
      spans: vec!["".into()],
      alignment: Alignment::Left,
+     ..Default::default()
  };

  // or

  let line = Line::raw(vec!["".into()])
      .alignment(Alignment::Left);

v0.25.0

Removed Axis::title_style and Buffer::set_background (#691)

These items were deprecated since 0.10.

  • You should use styling capabilities of text::Line given as argument of Axis::title instead of Axis::title_style
  • You should use styling capabilities of Buffer::set_style instead of Buffer::set_background

List::new() now accepts IntoIterator<Item = Into<ListItem<'a>>> (#672)

Previously List::new() took Into<Vec<ListItem<'a>>>. This change will throw a compilation error for IntoIterators with an indeterminate item (e.g. empty vecs).

E.g.

- let list = List::new(vec![]);
// becomes
+ let list = List::default();

The default Tabs::highlight_style is now Style::new().reversed() (#635)

Previously the default highlight style for tabs was Style::default(), which meant that a Tabs widget in the default configuration would not show any indication of the selected tab.

The default Tabs::highlight_style is now Style::new().reversed() (#635)

Previously the default highlight style for tabs was Style::default(), which meant that a Tabs widget in the default configuration would not show any indication of the selected tab.

Table::new() now requires specifying the widths of the columns (#664)

Previously Tables could be constructed without widths. In almost all cases this is an error. A new widths parameter is now mandatory on Table::new(). Existing code of the form:

- Table::new(rows).widths(widths)

Should be updated to:

+ Table::new(rows, widths)

For ease of automated replacement in cases where the amount of code broken by this change is large or complex, it may be convenient to replace Table::new with Table::default().rows.

- Table::new(rows).block(block).widths(widths);
// becomes
+ Table::default().rows(rows).widths(widths)

Table::widths() now accepts IntoIterator<Item = AsRef<Constraint>> (#663)

Previously Table::widths() took a slice (&'a [Constraint]). This change will introduce clippy needless_borrow warnings for places where slices are passed to this method. To fix these, remove the &.

E.g.

- let table = Table::new(rows).widths(&[Constraint::Length(1)]);
// becomes
+ let table = Table::new(rows, [Constraint::Length(1)]);

Layout::new() now accepts direction and constraint parameters (#557)

Previously layout new took no parameters. Existing code should either use Layout::default() or the new constructor.

let layout = layout::new()
  .direction(Direction::Vertical)
  .constraints([Constraint::Min(1), Constraint::Max(2)]);
// becomes either
let layout = layout::default()
  .direction(Direction::Vertical)
  .constraints([Constraint::Min(1), Constraint::Max(2)]);
// or
let layout = layout::new(Direction::Vertical, [Constraint::Min(1), Constraint::Max(2)]);

v0.24.0

ScrollbarState field type changed from u16 to usize (#456)

In order to support larger content lengths, the position, content_length and viewport_content_length methods on ScrollbarState now take usize instead of u16

BorderType::line_symbols renamed to border_symbols (#529)

Applications can now set custom borders on a Block by calling border_set(). The BorderType::line_symbols() is renamed to border_symbols() and now returns a new struct symbols::border::Set. E.g.:

- let line_set: symbols::line::Set = BorderType::line_symbols(BorderType::Plain);
// becomes
+ let border_set: symbols::border::Set = BorderType::border_symbols(BorderType::Plain);

Generic Backend parameter removed from Frame (#530)

Frame is no longer generic over Backend. Code that accepted Frame<Backend> will now need to accept Frame. To migrate existing code, remove any generic parameters from code that uses an instance of a Frame. E.g.:

- fn ui<B: Backend>(frame: &mut Frame<B>) { ... }
// becomes
+ fn ui(frame: Frame) { ... }

Stylize shorthands now consume rather than borrow String (#466)

In order to support using Stylize shorthands (e.g. "foo".red()) on temporary String values, a new implementation of Stylize was added that returns a Span<'static>. This causes the value to be consumed rather than borrowed. Existing code that expects to use the string after a call will no longer compile. E.g.

- let s = String::new("foo");
- let span1 = s.red();
- let span2 = s.blue(); // will no longer compile as s is consumed by the previous line
// becomes
+ let span1 = s.clone().red();
+ let span2 = s.blue();

Deprecated Spans type removed (replaced with Line) (#426)

Spans was replaced with Line in 0.21.0. Buffer::set_spans was replaced with Buffer::set_line.

- let spans = Spans::from(some_string_str_span_or_vec_span);
- buffer.set_spans(0, 0, spans, 10);
// becomes
+ let line - Line::from(some_string_str_span_or_vec_span);
+ buffer.set_line(0, 0, line, 10);

v0.23.0

Scrollbar::track_symbol() now takes an Option<&str> instead of &str (#360)

The track symbol of Scrollbar is now optional, this method now takes an optional value.

- let scrollbar = Scrollbar::default().track_symbol("|");
// becomes
+ let scrollbar = Scrollbar::default().track_symbol(Some("|"));

Scrollbar symbols moved to symbols::scrollbar and widgets::scrollbar module is private (#330)

The symbols for defining scrollbars have been moved to the symbols module from the widgets::scrollbar module which is no longer public. To update your code update any imports to the new module locations. E.g.:

- use ratatui::{widgets::scrollbar::{Scrollbar, Set}};
// becomes
+ use ratatui::{widgets::Scrollbar, symbols::scrollbar::Set}

MSRV updated to 1.67 (#361)

The MSRV of ratatui is now 1.67 due to an MSRV update in a dependency (time).

v0.22.0

bitflags updated to 2.3 (#205)

The serde representation of bitflags has changed. Any existing serialized types that have Borders or Modifiers will need to be re-serialized. This is documented in the bitflags changelog..

v0.21.0

MSRV is 1.65.0 (#171)

The minimum supported rust version is now 1.65.0.

Terminal::with_options() stabilized to allow configuring the viewport (#114)

In order to support inline viewports, the unstable method Terminal::with_options() was stabilized and ViewPort was changed from a struct to an enum.

let terminal = Terminal::with_options(backend, TerminalOptions {
-    viewport: Viewport::fixed(area),
});
// becomes
let terminal = Terminal::with_options(backend, TerminalOptions {
+    viewport: Viewport::Fixed(area),
});

Code that binds Into<Text<'a>> now requires type annotations (#168)

A new type Masked was introduced that implements From<Text<'a>>. This causes any code that previously did not need to use type annotations to fail to compile. To fix this, annotate or call to_string() / to_owned() / as_str() on the value. E.g.:

- let paragraph = Paragraph::new("".as_ref());
// becomes
+ let paragraph = Paragraph::new("".as_str());

Marker::Block now renders as a block rather than a bar character (#133)

Code using the Block marker that previously rendered using a half block character ('▀'``) now renders using the full block character ('█'). A new marker variantBar` is introduced to replace the existing code.

- let canvas = Canvas::default().marker(Marker::Block);
// becomes
+ let canvas = Canvas::default().marker(Marker::Bar);

v0.20.0

v0.20.0 was the first release of Ratatui - versions prior to this were release as tui-rs. See the Changelog for more details.

MSRV is update to 1.63.0 (#80)

The minimum supported rust version is 1.63.0

List no longer ignores empty string in items (#42)

The following code now renders 3 items instead of 2. Code which relies on the previous behavior will need to manually filter empty items prior to display.

let items = vec![
    ListItem::new("line one"),
    ListItem::new(""),
    ListItem::new("line four"),
];