Struct ratatui::widgets::ScrollbarState

source · 
pub struct ScrollbarState { /* private fields */ }
Expand description

A struct representing the state of a Scrollbar widget.

§Important

It’s essential to set the content_length field when using this struct. This field represents the total length of the scrollable content. The default value is zero which will result in the Scrollbar not rendering.

For example, in the following list, assume there are 4 bullet points:

  • the content_length is 4
  • the position is 0
  • the viewport_content_length is 2
┌───────────────┐
│1. this is a   █
│   single item █
│2. this is a   ║
│   second item ║
└───────────────┘

If you don’t have multi-line content, you can leave the viewport_content_length set to the default and it’ll use the track size as a viewport_content_length.

Implementations§

source§

impl ScrollbarState

source

pub const fn new(content_length: usize) -> Self

Constructs a new ScrollbarState with the specified content length.

content_length is the total number of element, that can be scrolled. See ScrollbarState for more details.

Examples found in repository?
examples/table.rs (line 106)
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    fn new() -> Self {
        let data_vec = generate_fake_names();
        Self {
            state: TableState::default().with_selected(0),
            longest_item_lens: constraint_len_calculator(&data_vec),
            scroll_state: ScrollbarState::new((data_vec.len() - 1) * ITEM_HEIGHT),
            colors: TableColors::new(&PALETTES[0]),
            color_index: 0,
            items: data_vec,
        }
    }
More examples
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examples/flex.rs (line 342)
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    fn render_demo(self, area: Rect, buf: &mut Buffer) -> bool {
        // render demo content into a separate buffer so all examples fit we add an extra
        // area.height to make sure the last example is fully visible even when the scroll offset is
        // at the max
        let height = example_height();
        let demo_area = Rect::new(0, 0, area.width, height);
        let mut demo_buf = Buffer::empty(demo_area);

        let scrollbar_needed = self.scroll_offset != 0 || height > area.height;
        let content_area = if scrollbar_needed {
            Rect {
                width: demo_area.width - 1,
                ..demo_area
            }
        } else {
            demo_area
        };

        let mut spacing = self.spacing;
        self.selected_tab
            .render(content_area, &mut demo_buf, &mut spacing);

        let visible_content = demo_buf
            .content
            .into_iter()
            .skip((area.width * self.scroll_offset) as usize)
            .take(area.area() as usize);
        for (i, cell) in visible_content.enumerate() {
            let x = i as u16 % area.width;
            let y = i as u16 / area.width;
            *buf.get_mut(area.x + x, area.y + y) = cell;
        }

        if scrollbar_needed {
            let area = area.intersection(buf.area);
            let mut state = ScrollbarState::new(max_scroll_offset() as usize)
                .position(self.scroll_offset as usize);
            Scrollbar::new(ScrollbarOrientation::VerticalRight).render(area, buf, &mut state);
        }
        scrollbar_needed
    }
source

pub const fn position(self, position: usize) -> Self

Sets the scroll position of the scrollbar.

This represents the number of scrolled items.

This is a fluent setter method which must be chained or used as it consumes self

Examples found in repository?
examples/table.rs (line 124)
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    pub fn next(&mut self) {
        let i = match self.state.selected() {
            Some(i) => {
                if i >= self.items.len() - 1 {
                    0
                } else {
                    i + 1
                }
            }
            None => 0,
        };
        self.state.select(Some(i));
        self.scroll_state = self.scroll_state.position(i * ITEM_HEIGHT);
    }

    pub fn previous(&mut self) {
        let i = match self.state.selected() {
            Some(i) => {
                if i == 0 {
                    self.items.len() - 1
                } else {
                    i - 1
                }
            }
            None => 0,
        };
        self.state.select(Some(i));
        self.scroll_state = self.scroll_state.position(i * ITEM_HEIGHT);
    }
More examples
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examples/demo2/tabs/recipe.rs (line 169)
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fn render_scrollbar(position: usize, area: Rect, buf: &mut Buffer) {
    let mut state = ScrollbarState::default()
        .content_length(INGREDIENTS.len())
        .viewport_content_length(6)
        .position(position);
    Scrollbar::new(ScrollbarOrientation::VerticalRight)
        .begin_symbol(None)
        .end_symbol(None)
        .track_symbol(None)
        .thumb_symbol("▐")
        .render(area, buf, &mut state);
}
examples/demo2/tabs/traceroute.rs (line 67)
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fn render_hops(selected_row: usize, area: Rect, buf: &mut Buffer) {
    let mut state = TableState::default().with_selected(Some(selected_row));
    let rows = HOPS
        .iter()
        .map(|hop| Row::new(vec![hop.host, hop.address]))
        .collect_vec();
    let block = Block::default()
        .title("Traceroute bad.horse".bold().white())
        .title_alignment(Alignment::Center)
        .padding(Padding::new(1, 1, 1, 1));
    StatefulWidget::render(
        Table::new(rows, [Constraint::Max(100), Constraint::Length(15)])
            .header(Row::new(vec!["Host", "Address"]).set_style(THEME.traceroute.header))
            .highlight_style(THEME.traceroute.selected)
            .block(block),
        area,
        buf,
        &mut state,
    );
    let mut scrollbar_state = ScrollbarState::default()
        .content_length(HOPS.len())
        .position(selected_row);
    let area = Rect {
        width: area.width + 1,
        y: area.y + 3,
        height: area.height - 4,
        ..area
    };
    Scrollbar::default()
        .orientation(ScrollbarOrientation::VerticalLeft)
        .begin_symbol(None)
        .end_symbol(None)
        .track_symbol(None)
        .thumb_symbol("▌")
        .render(area, buf, &mut scrollbar_state);
}
examples/demo2/tabs/email.rs (line 109)
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fn render_inbox(selected_index: usize, area: Rect, buf: &mut Buffer) {
    let vertical = Layout::vertical([Constraint::Length(1), Constraint::Min(0)]);
    let [tabs, inbox] = vertical.areas(area);
    let theme = THEME.email;
    Tabs::new(vec![" Inbox ", " Sent ", " Drafts "])
        .style(theme.tabs)
        .highlight_style(theme.tabs_selected)
        .select(0)
        .divider("")
        .render(tabs, buf);

    let highlight_symbol = ">>";
    let from_width = EMAILS
        .iter()
        .map(|e| e.from.width())
        .max()
        .unwrap_or_default();
    let items = EMAILS
        .iter()
        .map(|e| {
            let from = format!("{:width$}", e.from, width = from_width).into();
            ListItem::new(Line::from(vec![from, " ".into(), e.subject.into()]))
        })
        .collect_vec();
    let mut state = ListState::default().with_selected(Some(selected_index));
    StatefulWidget::render(
        List::new(items)
            .style(theme.inbox)
            .highlight_style(theme.selected_item)
            .highlight_symbol(highlight_symbol),
        inbox,
        buf,
        &mut state,
    );
    let mut scrollbar_state = ScrollbarState::default()
        .content_length(EMAILS.len())
        .position(selected_index);
    Scrollbar::default()
        .begin_symbol(None)
        .end_symbol(None)
        .track_symbol(None)
        .thumb_symbol("▐")
        .render(inbox, buf, &mut scrollbar_state);
}
examples/flex.rs (line 343)
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    fn render_demo(self, area: Rect, buf: &mut Buffer) -> bool {
        // render demo content into a separate buffer so all examples fit we add an extra
        // area.height to make sure the last example is fully visible even when the scroll offset is
        // at the max
        let height = example_height();
        let demo_area = Rect::new(0, 0, area.width, height);
        let mut demo_buf = Buffer::empty(demo_area);

        let scrollbar_needed = self.scroll_offset != 0 || height > area.height;
        let content_area = if scrollbar_needed {
            Rect {
                width: demo_area.width - 1,
                ..demo_area
            }
        } else {
            demo_area
        };

        let mut spacing = self.spacing;
        self.selected_tab
            .render(content_area, &mut demo_buf, &mut spacing);

        let visible_content = demo_buf
            .content
            .into_iter()
            .skip((area.width * self.scroll_offset) as usize)
            .take(area.area() as usize);
        for (i, cell) in visible_content.enumerate() {
            let x = i as u16 % area.width;
            let y = i as u16 / area.width;
            *buf.get_mut(area.x + x, area.y + y) = cell;
        }

        if scrollbar_needed {
            let area = area.intersection(buf.area);
            let mut state = ScrollbarState::new(max_scroll_offset() as usize)
                .position(self.scroll_offset as usize);
            Scrollbar::new(ScrollbarOrientation::VerticalRight).render(area, buf, &mut state);
        }
        scrollbar_needed
    }
examples/scrollbar.rs (line 86)
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fn run_app<B: Backend>(
    terminal: &mut Terminal<B>,
    mut app: App,
    tick_rate: Duration,
) -> io::Result<()> {
    let mut last_tick = Instant::now();
    loop {
        terminal.draw(|f| ui(f, &mut app))?;

        let timeout = tick_rate.saturating_sub(last_tick.elapsed());
        if crossterm::event::poll(timeout)? {
            if let Event::Key(key) = event::read()? {
                match key.code {
                    KeyCode::Char('q') => return Ok(()),
                    KeyCode::Char('j') | KeyCode::Down => {
                        app.vertical_scroll = app.vertical_scroll.saturating_add(1);
                        app.vertical_scroll_state =
                            app.vertical_scroll_state.position(app.vertical_scroll);
                    }
                    KeyCode::Char('k') | KeyCode::Up => {
                        app.vertical_scroll = app.vertical_scroll.saturating_sub(1);
                        app.vertical_scroll_state =
                            app.vertical_scroll_state.position(app.vertical_scroll);
                    }
                    KeyCode::Char('h') | KeyCode::Left => {
                        app.horizontal_scroll = app.horizontal_scroll.saturating_sub(1);
                        app.horizontal_scroll_state =
                            app.horizontal_scroll_state.position(app.horizontal_scroll);
                    }
                    KeyCode::Char('l') | KeyCode::Right => {
                        app.horizontal_scroll = app.horizontal_scroll.saturating_add(1);
                        app.horizontal_scroll_state =
                            app.horizontal_scroll_state.position(app.horizontal_scroll);
                    }
                    _ => {}
                }
            }
        }
        if last_tick.elapsed() >= tick_rate {
            last_tick = Instant::now();
        }
    }
}
source

pub const fn content_length(self, content_length: usize) -> Self

Sets the length of the scrollable content.

This is the number of scrollable items. If items have a length of one, then this is the same as the number of scrollable cells.

This is a fluent setter method which must be chained or used as it consumes self

Examples found in repository?
examples/demo2/tabs/recipe.rs (line 167)
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fn render_scrollbar(position: usize, area: Rect, buf: &mut Buffer) {
    let mut state = ScrollbarState::default()
        .content_length(INGREDIENTS.len())
        .viewport_content_length(6)
        .position(position);
    Scrollbar::new(ScrollbarOrientation::VerticalRight)
        .begin_symbol(None)
        .end_symbol(None)
        .track_symbol(None)
        .thumb_symbol("▐")
        .render(area, buf, &mut state);
}
More examples
Hide additional examples
examples/demo2/tabs/traceroute.rs (line 66)
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fn render_hops(selected_row: usize, area: Rect, buf: &mut Buffer) {
    let mut state = TableState::default().with_selected(Some(selected_row));
    let rows = HOPS
        .iter()
        .map(|hop| Row::new(vec![hop.host, hop.address]))
        .collect_vec();
    let block = Block::default()
        .title("Traceroute bad.horse".bold().white())
        .title_alignment(Alignment::Center)
        .padding(Padding::new(1, 1, 1, 1));
    StatefulWidget::render(
        Table::new(rows, [Constraint::Max(100), Constraint::Length(15)])
            .header(Row::new(vec!["Host", "Address"]).set_style(THEME.traceroute.header))
            .highlight_style(THEME.traceroute.selected)
            .block(block),
        area,
        buf,
        &mut state,
    );
    let mut scrollbar_state = ScrollbarState::default()
        .content_length(HOPS.len())
        .position(selected_row);
    let area = Rect {
        width: area.width + 1,
        y: area.y + 3,
        height: area.height - 4,
        ..area
    };
    Scrollbar::default()
        .orientation(ScrollbarOrientation::VerticalLeft)
        .begin_symbol(None)
        .end_symbol(None)
        .track_symbol(None)
        .thumb_symbol("▌")
        .render(area, buf, &mut scrollbar_state);
}
examples/demo2/tabs/email.rs (line 108)
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fn render_inbox(selected_index: usize, area: Rect, buf: &mut Buffer) {
    let vertical = Layout::vertical([Constraint::Length(1), Constraint::Min(0)]);
    let [tabs, inbox] = vertical.areas(area);
    let theme = THEME.email;
    Tabs::new(vec![" Inbox ", " Sent ", " Drafts "])
        .style(theme.tabs)
        .highlight_style(theme.tabs_selected)
        .select(0)
        .divider("")
        .render(tabs, buf);

    let highlight_symbol = ">>";
    let from_width = EMAILS
        .iter()
        .map(|e| e.from.width())
        .max()
        .unwrap_or_default();
    let items = EMAILS
        .iter()
        .map(|e| {
            let from = format!("{:width$}", e.from, width = from_width).into();
            ListItem::new(Line::from(vec![from, " ".into(), e.subject.into()]))
        })
        .collect_vec();
    let mut state = ListState::default().with_selected(Some(selected_index));
    StatefulWidget::render(
        List::new(items)
            .style(theme.inbox)
            .highlight_style(theme.selected_item)
            .highlight_symbol(highlight_symbol),
        inbox,
        buf,
        &mut state,
    );
    let mut scrollbar_state = ScrollbarState::default()
        .content_length(EMAILS.len())
        .position(selected_index);
    Scrollbar::default()
        .begin_symbol(None)
        .end_symbol(None)
        .track_symbol(None)
        .thumb_symbol("▐")
        .render(inbox, buf, &mut scrollbar_state);
}
examples/scrollbar.rs (line 153)
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fn ui(f: &mut Frame, app: &mut App) {
    let size = f.size();

    // Words made "loooong" to demonstrate line breaking.
    let s = "Veeeeeeeeeeeeeeeery    loooooooooooooooooong   striiiiiiiiiiiiiiiiiiiiiiiiiing.   ";
    let mut long_line = s.repeat(usize::from(size.width) / s.len() + 4);
    long_line.push('\n');

    let chunks = Layout::vertical([
        Constraint::Min(1),
        Constraint::Percentage(25),
        Constraint::Percentage(25),
        Constraint::Percentage(25),
        Constraint::Percentage(25),
    ])
    .split(size);

    let text = vec![
        Line::from("This is a line "),
        Line::from("This is a line   ".red()),
        Line::from("This is a line".on_dark_gray()),
        Line::from("This is a longer line".crossed_out()),
        Line::from(long_line.clone()),
        Line::from("This is a line".reset()),
        Line::from(vec![
            Span::raw("Masked text: "),
            Span::styled(Masked::new("password", '*'), Style::new().fg(Color::Red)),
        ]),
        Line::from("This is a line "),
        Line::from("This is a line   ".red()),
        Line::from("This is a line".on_dark_gray()),
        Line::from("This is a longer line".crossed_out()),
        Line::from(long_line.clone()),
        Line::from("This is a line".reset()),
        Line::from(vec![
            Span::raw("Masked text: "),
            Span::styled(Masked::new("password", '*'), Style::new().fg(Color::Red)),
        ]),
    ];
    app.vertical_scroll_state = app.vertical_scroll_state.content_length(text.len());
    app.horizontal_scroll_state = app.horizontal_scroll_state.content_length(long_line.len());

    let create_block = |title: &'static str| Block::bordered().gray().title(title.bold());

    let title = Block::new()
        .title_alignment(Alignment::Center)
        .title("Use h j k l or ◄ ▲ ▼ ► to scroll ".bold());
    f.render_widget(title, chunks[0]);

    let paragraph = Paragraph::new(text.clone())
        .gray()
        .block(create_block("Vertical scrollbar with arrows"))
        .scroll((app.vertical_scroll as u16, 0));
    f.render_widget(paragraph, chunks[1]);
    f.render_stateful_widget(
        Scrollbar::new(ScrollbarOrientation::VerticalRight)
            .begin_symbol(Some("↑"))
            .end_symbol(Some("↓")),
        chunks[1],
        &mut app.vertical_scroll_state,
    );

    let paragraph = Paragraph::new(text.clone())
        .gray()
        .block(create_block(
            "Vertical scrollbar without arrows, without track symbol and mirrored",
        ))
        .scroll((app.vertical_scroll as u16, 0));
    f.render_widget(paragraph, chunks[2]);
    f.render_stateful_widget(
        Scrollbar::new(ScrollbarOrientation::VerticalLeft)
            .symbols(scrollbar::VERTICAL)
            .begin_symbol(None)
            .track_symbol(None)
            .end_symbol(None),
        chunks[2].inner(&Margin {
            vertical: 1,
            horizontal: 0,
        }),
        &mut app.vertical_scroll_state,
    );

    let paragraph = Paragraph::new(text.clone())
        .gray()
        .block(create_block(
            "Horizontal scrollbar with only begin arrow & custom thumb symbol",
        ))
        .scroll((0, app.horizontal_scroll as u16));
    f.render_widget(paragraph, chunks[3]);
    f.render_stateful_widget(
        Scrollbar::new(ScrollbarOrientation::HorizontalBottom)
            .thumb_symbol("🬋")
            .end_symbol(None),
        chunks[3].inner(&Margin {
            vertical: 0,
            horizontal: 1,
        }),
        &mut app.horizontal_scroll_state,
    );

    let paragraph = Paragraph::new(text.clone())
        .gray()
        .block(create_block(
            "Horizontal scrollbar without arrows & custom thumb and track symbol",
        ))
        .scroll((0, app.horizontal_scroll as u16));
    f.render_widget(paragraph, chunks[4]);
    f.render_stateful_widget(
        Scrollbar::new(ScrollbarOrientation::HorizontalBottom)
            .thumb_symbol("░")
            .track_symbol(Some("─")),
        chunks[4].inner(&Margin {
            vertical: 0,
            horizontal: 1,
        }),
        &mut app.horizontal_scroll_state,
    );
}
source

pub const fn viewport_content_length( self, viewport_content_length: usize ) -> Self

Sets the items’ size.

This is a fluent setter method which must be chained or used as it consumes self

Examples found in repository?
examples/demo2/tabs/recipe.rs (line 168)
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fn render_scrollbar(position: usize, area: Rect, buf: &mut Buffer) {
    let mut state = ScrollbarState::default()
        .content_length(INGREDIENTS.len())
        .viewport_content_length(6)
        .position(position);
    Scrollbar::new(ScrollbarOrientation::VerticalRight)
        .begin_symbol(None)
        .end_symbol(None)
        .track_symbol(None)
        .thumb_symbol("▐")
        .render(area, buf, &mut state);
}
source

pub fn prev(&mut self)

Decrements the scroll position by one, ensuring it doesn’t go below zero.

source

pub fn next(&mut self)

Increments the scroll position by one, ensuring it doesn’t exceed the length of the content.

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pub fn first(&mut self)

Sets the scroll position to the start of the scrollable content.

source

pub fn last(&mut self)

Sets the scroll position to the end of the scrollable content.

source

pub fn scroll(&mut self, direction: ScrollDirection)

Changes the scroll position based on the provided ScrollDirection.

Trait Implementations§

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impl Clone for ScrollbarState

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fn clone(&self) -> ScrollbarState

Returns a copy of the value. Read more
1.0.0 · source§

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for ScrollbarState

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl Default for ScrollbarState

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fn default() -> Self

Returns the “default value” for a type. Read more
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impl<'de> Deserialize<'de> for ScrollbarState

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fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>
where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer. Read more
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impl Hash for ScrollbarState

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fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl PartialEq for ScrollbarState

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fn eq(&self, other: &ScrollbarState) -> bool

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl Serialize for ScrollbarState

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fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>
where __S: Serializer,

Serialize this value into the given Serde serializer. Read more
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impl Copy for ScrollbarState

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impl Eq for ScrollbarState

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impl StructuralPartialEq for ScrollbarState

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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impl<T> Same for T

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type Output = T

Should always be Self
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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<T> DeserializeOwned for T
where T: for<'de> Deserialize<'de>,