Struct Button 

pub struct Button { /* private fields */ }

Something a row offers: a page to open, a form to fill in, or a reason it cannot be done yet.

Implementations

impl Button

pub fn link(label: impl Into<String>, url: impl Into<String>) -> Self

A page out of the app, opened in a tab of its own. The URL is held to the same rule a row’s own link is.

Examples found in repository

examples/library/main.rs (line 858)

    fn render(&self, args: &ViewArgs, ctx: &Context) -> Result<ViewData, ApiError> {
        let branches: Vec<Branch> = ctx.optional_rows(BRANCHES_FILE)?;
        let books: Vec<Book> = ctx.optional_rows(BOOKS_FILE)?;
        let code = args.get_or("branch", "");
        let branch = branches
            .iter()
            .find(|b| b.code == code)
            .ok_or_else(|| ApiError::new(404, format!("no branch has the code \"{code}\"")))?;

        let (here, out) = shelf_counts(&books, code);
        let now = today();

        // What is out, with how it stands against its due date. A row's own
        // link is the catalogue entry, and one book's link is a `javascript:`
        // URL, which the page shows as text rather than following.
        let mut lent = DetailSection::main("Out on loan");
        for book in BranchDetail::by_rating(&books, code, true) {
            let late = days_from_civil(&book.due).map(|due| now - due);
            let mut row = DetailRow::new(book.title.as_str()).link(book.link.as_str());
            if !book.due.is_empty() {
                row = row.fact(format!("due {}", book.due));
            }
            row = match late {
                Some(days) if days > 0 => row.fact(format!("{days} day(s) late")),
                Some(days) => row.fact(format!("{} day(s) to go", -days)),
                None => row.note("No due date is recorded."),
            };
            lent = lent.row(row.button(Button::disabled("Chase the borrower", "Not built yet")));
        }
        if out == 0 {
            lent = lent.note("Everything this branch holds is on the shelf.");
        }

        // What can go out, ranked, with the one action this example offers.
        let mut shelf = DetailSection::main("On the shelf")
            .numbered()
            .note("Best rated first.");
        for book in BranchDetail::by_rating(&books, code, false) {
            let mut row = DetailRow::new(book.title.as_str());
            if let Some(rating) = book.rating {
                row = row.fact(format!("rated {rating}"));
            }
            if let Some(year) = book.year {
                row = row.fact(year);
            }
            if !book.notes.trim().is_empty() {
                row = row.note(book.notes.as_str());
            }
            shelf = shelf.row(
                row.button(Button::link("Catalogue", book.link.as_str()))
                    .button(Button::form(
                        "Lend it out",
                        BranchDetail::loan_form(&book.title),
                    )),
            );
        }
        if here == out {
            shelf = shelf.note("Nothing this branch holds is on the shelf today.");
        }

        let mut hours = DetailSection::side("When it is open").collapsed_on_phone();
        for (day, open) in &branch.hours {
            hours = hours.row(DetailRow::new(day.as_str()).fact(open.as_str()));
        }
        if branch.hours.is_empty() {
            hours = hours.note("No hours are recorded for this branch.");
        }

        // A count per genre, which is a section of facts rather than of things
        // to do, so it sits beside the page rather than in it.
        let mut counts: BTreeMap<&str, usize> = BTreeMap::new();
        for book in books.iter().filter(|b| b.shelved.contains_key(code)) {
            *counts.entry(book.genre.as_str()).or_default() += 1;
        }
        let mut genres = DetailSection::side("Genres here");
        for (genre, count) in counts {
            genres = genres.row(DetailRow::new(genre).fact(count));
        }

        Ok(ViewData::new().detail(
            Detail::new(branch.name.as_str())
                .status(if branch.open.unwrap_or(false) {
                    Status::new("Open", Tone::Good)
                } else {
                    Status::new("Shut", Tone::Neutral)
                })
                .subtitle(format!(
                    "{}, {} staff, {here} book(s) here, {out} out",
                    librarian(branch),
                    branch.staff.unwrap_or(0)
                ))
                .back(ViewLink::new("all-branches"))
                .section(lent)
                .section(shelf)
                .section(hours)
                .section(genres),
        ))
    }

pub fn form(label: impl Into<String>, form: Form) -> Self

A form the button reveals, which writes when it is saved.

Examples found in repository

examples/library/main.rs (lines 859-862)

    fn render(&self, args: &ViewArgs, ctx: &Context) -> Result<ViewData, ApiError> {
        let branches: Vec<Branch> = ctx.optional_rows(BRANCHES_FILE)?;
        let books: Vec<Book> = ctx.optional_rows(BOOKS_FILE)?;
        let code = args.get_or("branch", "");
        let branch = branches
            .iter()
            .find(|b| b.code == code)
            .ok_or_else(|| ApiError::new(404, format!("no branch has the code \"{code}\"")))?;

        let (here, out) = shelf_counts(&books, code);
        let now = today();

        // What is out, with how it stands against its due date. A row's own
        // link is the catalogue entry, and one book's link is a `javascript:`
        // URL, which the page shows as text rather than following.
        let mut lent = DetailSection::main("Out on loan");
        for book in BranchDetail::by_rating(&books, code, true) {
            let late = days_from_civil(&book.due).map(|due| now - due);
            let mut row = DetailRow::new(book.title.as_str()).link(book.link.as_str());
            if !book.due.is_empty() {
                row = row.fact(format!("due {}", book.due));
            }
            row = match late {
                Some(days) if days > 0 => row.fact(format!("{days} day(s) late")),
                Some(days) => row.fact(format!("{} day(s) to go", -days)),
                None => row.note("No due date is recorded."),
            };
            lent = lent.row(row.button(Button::disabled("Chase the borrower", "Not built yet")));
        }
        if out == 0 {
            lent = lent.note("Everything this branch holds is on the shelf.");
        }

        // What can go out, ranked, with the one action this example offers.
        let mut shelf = DetailSection::main("On the shelf")
            .numbered()
            .note("Best rated first.");
        for book in BranchDetail::by_rating(&books, code, false) {
            let mut row = DetailRow::new(book.title.as_str());
            if let Some(rating) = book.rating {
                row = row.fact(format!("rated {rating}"));
            }
            if let Some(year) = book.year {
                row = row.fact(year);
            }
            if !book.notes.trim().is_empty() {
                row = row.note(book.notes.as_str());
            }
            shelf = shelf.row(
                row.button(Button::link("Catalogue", book.link.as_str()))
                    .button(Button::form(
                        "Lend it out",
                        BranchDetail::loan_form(&book.title),
                    )),
            );
        }
        if here == out {
            shelf = shelf.note("Nothing this branch holds is on the shelf today.");
        }

        let mut hours = DetailSection::side("When it is open").collapsed_on_phone();
        for (day, open) in &branch.hours {
            hours = hours.row(DetailRow::new(day.as_str()).fact(open.as_str()));
        }
        if branch.hours.is_empty() {
            hours = hours.note("No hours are recorded for this branch.");
        }

        // A count per genre, which is a section of facts rather than of things
        // to do, so it sits beside the page rather than in it.
        let mut counts: BTreeMap<&str, usize> = BTreeMap::new();
        for book in books.iter().filter(|b| b.shelved.contains_key(code)) {
            *counts.entry(book.genre.as_str()).or_default() += 1;
        }
        let mut genres = DetailSection::side("Genres here");
        for (genre, count) in counts {
            genres = genres.row(DetailRow::new(genre).fact(count));
        }

        Ok(ViewData::new().detail(
            Detail::new(branch.name.as_str())
                .status(if branch.open.unwrap_or(false) {
                    Status::new("Open", Tone::Good)
                } else {
                    Status::new("Shut", Tone::Neutral)
                })
                .subtitle(format!(
                    "{}, {} staff, {here} book(s) here, {out} out",
                    librarian(branch),
                    branch.staff.unwrap_or(0)
                ))
                .back(ViewLink::new("all-branches"))
                .section(lent)
                .section(shelf)
                .section(hours)
                .section(genres),
        ))
    }

pub fn disabled(label: impl Into<String>, reason: impl Into<String>) -> Self

A button that cannot be pressed, and why. It is drawn rather than left out, so that what a page will one day do is visible on it.

Examples found in repository

examples/library/main.rs (line 836)

    fn render(&self, args: &ViewArgs, ctx: &Context) -> Result<ViewData, ApiError> {
        let branches: Vec<Branch> = ctx.optional_rows(BRANCHES_FILE)?;
        let books: Vec<Book> = ctx.optional_rows(BOOKS_FILE)?;
        let code = args.get_or("branch", "");
        let branch = branches
            .iter()
            .find(|b| b.code == code)
            .ok_or_else(|| ApiError::new(404, format!("no branch has the code \"{code}\"")))?;

        let (here, out) = shelf_counts(&books, code);
        let now = today();

        // What is out, with how it stands against its due date. A row's own
        // link is the catalogue entry, and one book's link is a `javascript:`
        // URL, which the page shows as text rather than following.
        let mut lent = DetailSection::main("Out on loan");
        for book in BranchDetail::by_rating(&books, code, true) {
            let late = days_from_civil(&book.due).map(|due| now - due);
            let mut row = DetailRow::new(book.title.as_str()).link(book.link.as_str());
            if !book.due.is_empty() {
                row = row.fact(format!("due {}", book.due));
            }
            row = match late {
                Some(days) if days > 0 => row.fact(format!("{days} day(s) late")),
                Some(days) => row.fact(format!("{} day(s) to go", -days)),
                None => row.note("No due date is recorded."),
            };
            lent = lent.row(row.button(Button::disabled("Chase the borrower", "Not built yet")));
        }
        if out == 0 {
            lent = lent.note("Everything this branch holds is on the shelf.");
        }

        // What can go out, ranked, with the one action this example offers.
        let mut shelf = DetailSection::main("On the shelf")
            .numbered()
            .note("Best rated first.");
        for book in BranchDetail::by_rating(&books, code, false) {
            let mut row = DetailRow::new(book.title.as_str());
            if let Some(rating) = book.rating {
                row = row.fact(format!("rated {rating}"));
            }
            if let Some(year) = book.year {
                row = row.fact(year);
            }
            if !book.notes.trim().is_empty() {
                row = row.note(book.notes.as_str());
            }
            shelf = shelf.row(
                row.button(Button::link("Catalogue", book.link.as_str()))
                    .button(Button::form(
                        "Lend it out",
                        BranchDetail::loan_form(&book.title),
                    )),
            );
        }
        if here == out {
            shelf = shelf.note("Nothing this branch holds is on the shelf today.");
        }

        let mut hours = DetailSection::side("When it is open").collapsed_on_phone();
        for (day, open) in &branch.hours {
            hours = hours.row(DetailRow::new(day.as_str()).fact(open.as_str()));
        }
        if branch.hours.is_empty() {
            hours = hours.note("No hours are recorded for this branch.");
        }

        // A count per genre, which is a section of facts rather than of things
        // to do, so it sits beside the page rather than in it.
        let mut counts: BTreeMap<&str, usize> = BTreeMap::new();
        for book in books.iter().filter(|b| b.shelved.contains_key(code)) {
            *counts.entry(book.genre.as_str()).or_default() += 1;
        }
        let mut genres = DetailSection::side("Genres here");
        for (genre, count) in counts {
            genres = genres.row(DetailRow::new(genre).fact(count));
        }

        Ok(ViewData::new().detail(
            Detail::new(branch.name.as_str())
                .status(if branch.open.unwrap_or(false) {
                    Status::new("Open", Tone::Good)
                } else {
                    Status::new("Shut", Tone::Neutral)
                })
                .subtitle(format!(
                    "{}, {} staff, {here} book(s) here, {out} out",
                    librarian(branch),
                    branch.staff.unwrap_or(0)
                ))
                .back(ViewLink::new("all-branches"))
                .section(lent)
                .section(shelf)
                .section(hours)
                .section(genres),
        ))
    }

Trait Implementations

impl Clone for Button

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Button

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

Formats the value using the given formatter.

impl Serialize for Button

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

where __S: Serializer,

Serialize this value into the given Serde serializer.