Add option to truncate text at wrap width (#3244)

* Add option to clip text to wrap width

* Spelling

* Better naming, and report back wether the text was elided

* Improve docstrings

* Simplify

* Fix max_rows with multiple paragraphs

* Add note

* Typos

* fix doclink

* Add `Label::elide`

* Label: show full non-elided text on hover

* Add demo of `Label::elide`

* Call it `Label::truncate`

* Clarify limitations of `break_anywhere`

* Better docstrings

crates/egui/src/widget_text.rs

@@ -676,7 +676,7 @@ impl WidgetTextGalley {
         self.galley.size()
     }
 
-    /// Size of the laid out text.
+    /// The full, non-elided text of the input job.
     #[inline]
     pub fn text(&self) -> &str {
         self.galley.text()

crates/egui/src/widgets/label.rs

@@ -12,10 +12,14 @@ use crate::{widget_text::WidgetTextGalley, *};
 /// ui.label(egui::RichText::new("With formatting").underline());
 /// # });
 /// ```
+///
+/// For full control of the text you can use [`crate::text::LayoutJob`]
+/// as argument to [`Self::new`].
 #[must_use = "You should put this widget in an ui with `ui.add(widget);`"]
 pub struct Label {
     text: WidgetText,
     wrap: Option<bool>,
+    truncate: bool,
     sense: Option<Sense>,
 }
 
@@ -24,6 +28,7 @@ impl Label {
         Self {
             text: text.into(),
             wrap: None,
+            truncate: false,
             sense: None,
         }
     }
@@ -34,6 +39,8 @@ impl Label {
 
     /// If `true`, the text will wrap to stay within the max width of the [`Ui`].
     ///
+    /// Calling `wrap` will override [`Self::truncate`].
+    ///
     /// By default [`Self::wrap`] will be `true` in vertical layouts
     /// and horizontal layouts with wrapping,
     /// and `false` on non-wrapping horizontal layouts.
@@ -44,6 +51,23 @@ impl Label {
     #[inline]
     pub fn wrap(mut self, wrap: bool) -> Self {
         self.wrap = Some(wrap);
+        self.truncate = false;
+        self
+    }
+
+    /// If `true`, the text will stop at the max width of the [`Ui`],
+    /// and what doesn't fit will be elided, replaced with `…`.
+    ///
+    /// If the text is truncated, the full text will be shown on hover as a tool-tip.
+    ///
+    /// Default is `false`, which means the text will expand the parent [`Ui`],
+    /// or wrap if [`Self::wrap`] is set.
+    ///
+    /// Calling `truncate` will override [`Self::wrap`].
+    #[inline]
+    pub fn truncate(mut self, truncate: bool) -> Self {
+        self.wrap = None;
+        self.truncate = truncate;
         self
     }
 
@@ -98,10 +122,11 @@ impl Label {
             .text
             .into_text_job(ui.style(), FontSelection::Default, valign);
 
-        let should_wrap = self.wrap.unwrap_or_else(|| ui.wrap_text());
+        let truncate = self.truncate;
+        let wrap = !truncate && self.wrap.unwrap_or_else(|| ui.wrap_text());
         let available_width = ui.available_width();
 
-        if should_wrap
+        if wrap
             && ui.layout().main_dir() == Direction::LeftToRight
             && ui.layout().main_wrap()
             && available_width.is_finite()
@@ -138,7 +163,11 @@ impl Label {
             }
             (pos, text_galley, response)
         } else {
-            if should_wrap {
+            if truncate {
+                text_job.job.wrap.max_width = available_width;
+                text_job.job.wrap.max_rows = 1;
+                text_job.job.wrap.break_anywhere = true;
+            } else if wrap {
                 text_job.job.wrap.max_width = available_width;
             } else {
                 text_job.job.wrap.max_width = f32::INFINITY;
@@ -167,9 +196,14 @@ impl Label {
 
 impl Widget for Label {
     fn ui(self, ui: &mut Ui) -> Response {
-        let (pos, text_galley, response) = self.layout_in_ui(ui);
+        let (pos, text_galley, mut response) = self.layout_in_ui(ui);
         response.widget_info(|| WidgetInfo::labeled(WidgetType::Label, text_galley.text()));
 
+        if text_galley.galley.elided {
+            // Show the full (non-elided) text on hover:
+            response = response.on_hover_text(text_galley.text());
+        }
+
         if ui.is_rect_visible(response.rect) {
             let response_color = ui.style().interact(&response).text_color();
 

crates/egui_demo_lib/src/demo/misc_demo_window.rs

@@ -1,5 +1,4 @@
 use super::*;
-use crate::LOREM_IPSUM;
 use egui::{epaint::text::TextWrapping, *};
 
 /// Showcase some ui code
@@ -8,9 +7,7 @@ use egui::{epaint::text::TextWrapping, *};
 pub struct MiscDemoWindow {
     num_columns: usize,
 
-    break_anywhere: bool,
+    text_break: TextBreakDemo,
-    max_rows: usize,
-    overflow_character: Option<char>,
 
     widgets: Widgets,
     colors: ColorWidgets,
@@ -27,9 +24,7 @@ impl Default for MiscDemoWindow {
         MiscDemoWindow {
             num_columns: 2,
 
-            max_rows: 2,
+            text_break: Default::default(),
-            break_anywhere: false,
-            overflow_character: Some('…'),
 
             widgets: Default::default(),
             colors: Default::default(),
@@ -61,8 +56,14 @@ impl View for MiscDemoWindow {
     fn ui(&mut self, ui: &mut Ui) {
         ui.set_min_width(250.0);
 
-        CollapsingHeader::new("Widgets")
+        CollapsingHeader::new("Label")
             .default_open(true)
+            .show(ui, |ui| {
+                label_ui(ui);
+            });
+
+        CollapsingHeader::new("Misc widgets")
+            .default_open(false)
             .show(ui, |ui| {
                 self.widgets.ui(ui);
             });
@@ -70,12 +71,12 @@ impl View for MiscDemoWindow {
         CollapsingHeader::new("Text layout")
             .default_open(false)
             .show(ui, |ui| {
-                text_layout_ui(
+                text_layout_demo(ui);
-                    ui,
+                ui.separator();
-                    &mut self.max_rows,
+                self.text_break.ui(ui);
-                    &mut self.break_anywhere,
+                ui.vertical_centered(|ui| {
-                    &mut self.overflow_character,
+                    ui.add(crate::egui_github_link_file_line!());
-                );
+                });
             });
 
         CollapsingHeader::new("Colors")
@@ -177,6 +178,43 @@ impl View for MiscDemoWindow {
 
 // ----------------------------------------------------------------------------
 
+fn label_ui(ui: &mut egui::Ui) {
+    ui.vertical_centered(|ui| {
+        ui.add(crate::egui_github_link_file_line!());
+    });
+
+    ui.horizontal_wrapped(|ui| {
+            // Trick so we don't have to add spaces in the text below:
+            let width = ui.fonts(|f|f.glyph_width(&TextStyle::Body.resolve(ui.style()), ' '));
+            ui.spacing_mut().item_spacing.x = width;
+
+            ui.label(RichText::new("Text can have").color(Color32::from_rgb(110, 255, 110)));
+            ui.colored_label(Color32::from_rgb(128, 140, 255), "color"); // Shortcut version
+            ui.label("and tooltips.").on_hover_text(
+                "This is a multiline tooltip that demonstrates that you can easily add tooltips to any element.\nThis is the second line.\nThis is the third.",
+            );
+
+            ui.label("You can mix in other widgets into text, like");
+            let _ = ui.small_button("this button");
+            ui.label(".");
+
+            ui.label("The default font supports all latin and cyrillic characters (ИÅđ…), common math symbols (∫√∞²⅓…), and many emojis (💓🌟🖩…).")
+                .on_hover_text("There is currently no support for right-to-left languages.");
+            ui.label("See the 🔤 Font Book for more!");
+
+            ui.monospace("There is also a monospace font.");
+        });
+
+    ui.add(
+        egui::Label::new(
+            "Labels containing long text can be set to elide the text that doesn't fit on a single line using `Label::elide`. When hovered, the label will show the full text.",
+        )
+        .truncate(true),
+    );
+}
+
+// ----------------------------------------------------------------------------
+
 #[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
 #[cfg_attr(feature = "serde", serde(default))]
 pub struct Widgets {
@@ -200,28 +238,6 @@ impl Widgets {
             ui.add(crate::egui_github_link_file_line!());
         });
 
-        ui.horizontal_wrapped(|ui| {
-            // Trick so we don't have to add spaces in the text below:
-            let width = ui.fonts(|f|f.glyph_width(&TextStyle::Body.resolve(ui.style()), ' '));
-            ui.spacing_mut().item_spacing.x = width;
-
-            ui.label(RichText::new("Text can have").color(Color32::from_rgb(110, 255, 110)));
-            ui.colored_label(Color32::from_rgb(128, 140, 255), "color"); // Shortcut version
-            ui.label("and tooltips.").on_hover_text(
-                "This is a multiline tooltip that demonstrates that you can easily add tooltips to any element.\nThis is the second line.\nThis is the third.",
-            );
-
-            ui.label("You can mix in other widgets into text, like");
-            let _ = ui.small_button("this button");
-            ui.label(".");
-
-            ui.label("The default font supports all latin and cyrillic characters (ИÅđ…), common math symbols (∫√∞²⅓…), and many emojis (💓🌟🖩…).")
-                .on_hover_text("There is currently no support for right-to-left languages.");
-            ui.label("See the 🔤 Font Book for more!");
-
-            ui.monospace("There is also a monospace font.");
-        });
-
         let tooltip_ui = |ui: &mut Ui| {
             ui.heading("The name of the tooltip");
             ui.horizontal(|ui| {
@@ -473,12 +489,7 @@ impl Tree {
 
 // ----------------------------------------------------------------------------
 
-fn text_layout_ui(
+fn text_layout_demo(ui: &mut Ui) {
-    ui: &mut egui::Ui,
-    max_rows: &mut usize,
-    break_anywhere: &mut bool,
-    overflow_character: &mut Option<char>,
-) {
     use egui::text::LayoutJob;
 
     let mut job = LayoutJob::default();
@@ -632,32 +643,64 @@ fn text_layout_ui(
     );
 
     ui.label(job);
-
+}
-    ui.separator();
+
-
+#[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
-    ui.horizontal(|ui| {
+#[cfg_attr(feature = "serde", serde(default))]
-        ui.add(DragValue::new(max_rows));
+struct TextBreakDemo {
-        ui.label("Max rows");
+    break_anywhere: bool,
-    });
+    max_rows: usize,
-    ui.checkbox(break_anywhere, "Break anywhere");
+    overflow_character: Option<char>,
-    ui.horizontal(|ui| {
+}
-        ui.selectable_value(overflow_character, None, "None");
+
-        ui.selectable_value(overflow_character, Some('…'), "…");
+impl Default for TextBreakDemo {
-        ui.selectable_value(overflow_character, Some('—'), "—");
+    fn default() -> Self {
-        ui.selectable_value(overflow_character, Some('-'), "  -  ");
+        Self {
-        ui.label("Overflow character");
+            max_rows: 1,
-    });
+            break_anywhere: true,
-
+            overflow_character: Some('…'),
-    let mut job = LayoutJob::single_section(LOREM_IPSUM.to_owned(), TextFormat::default());
+        }
-    job.wrap = TextWrapping {
+    }
-        max_rows: *max_rows,
+}
-        break_anywhere: *break_anywhere,
+
-        overflow_character: *overflow_character,
+impl TextBreakDemo {
-        ..Default::default()
+    pub fn ui(&mut self, ui: &mut Ui) {
-    };
+        let Self {
-    ui.label(job);
+            break_anywhere,
-
+            max_rows,
-    ui.vertical_centered(|ui| {
+            overflow_character,
-        ui.add(crate::egui_github_link_file_line!());
+        } = self;
-    });
+
+        use egui::text::LayoutJob;
+
+        ui.horizontal(|ui| {
+            ui.add(DragValue::new(max_rows));
+            ui.label("Max rows");
+        });
+
+        ui.horizontal(|ui| {
+            ui.label("Line-break:");
+            ui.radio_value(break_anywhere, false, "word boundaries");
+            ui.radio_value(break_anywhere, true, "anywhere");
+        });
+
+        ui.horizontal(|ui| {
+            ui.selectable_value(overflow_character, None, "None");
+            ui.selectable_value(overflow_character, Some('…'), "…");
+            ui.selectable_value(overflow_character, Some('—'), "—");
+            ui.selectable_value(overflow_character, Some('-'), "  -  ");
+            ui.label("Overflow character");
+        });
+
+        let mut job =
+            LayoutJob::single_section(crate::LOREM_IPSUM_LONG.to_owned(), TextFormat::default());
+        job.wrap = TextWrapping {
+            max_rows: *max_rows,
+            break_anywhere: *break_anywhere,
+            overflow_character: *overflow_character,
+            ..Default::default()
+        };
+
+        ui.label(job); // `Label` overrides some of the wrapping settings, e.g. wrap width
+    }
 }

crates/epaint/src/text/text_layout.rs

@@ -1,10 +1,12 @@
 use std::ops::RangeInclusive;
 use std::sync::Arc;
 
-use super::{FontsImpl, Galley, Glyph, LayoutJob, LayoutSection, Row, RowVisuals};
-use crate::{Color32, Mesh, Stroke, Vertex};
 use emath::*;
 
+use crate::{Color32, Mesh, Stroke, Vertex};
+
+use super::{FontsImpl, Galley, Glyph, LayoutJob, LayoutSection, Row, RowVisuals};
+
 // ----------------------------------------------------------------------------
 
 /// Represents GUI scale and convenience methods for rounding to pixels.
@@ -54,6 +56,20 @@ struct Paragraph {
 /// In most cases you should use [`crate::Fonts::layout_job`] instead
 /// since that memoizes the input, making subsequent layouting of the same text much faster.
 pub fn layout(fonts: &mut FontsImpl, job: Arc<LayoutJob>) -> Galley {
+    if job.wrap.max_rows == 0 {
+        // Early-out: no text
+        return Galley {
+            job,
+            rows: Default::default(),
+            rect: Rect::from_min_max(Pos2::ZERO, Pos2::ZERO),
+            mesh_bounds: Rect::NOTHING,
+            num_vertices: 0,
+            num_indices: 0,
+            pixels_per_point: fonts.pixels_per_point(),
+            elided: true,
+        };
+    }
+
     let mut paragraphs = vec![Paragraph::default()];
     for (section_index, section) in job.sections.iter().enumerate() {
         layout_section(fonts, &job, section_index as u32, section, &mut paragraphs);
@@ -61,7 +77,8 @@ pub fn layout(fonts: &mut FontsImpl, job: Arc<LayoutJob>) -> Galley {
 
     let point_scale = PointScale::new(fonts.pixels_per_point());
 
-    let mut rows = rows_from_paragraphs(fonts, paragraphs, &job);
+    let mut elided = false;
+    let mut rows = rows_from_paragraphs(fonts, paragraphs, &job, &mut elided);
 
     let justify = job.justify && job.wrap.max_width.is_finite();
 
@@ -80,7 +97,7 @@ pub fn layout(fonts: &mut FontsImpl, job: Arc<LayoutJob>) -> Galley {
         }
     }
 
-    galley_from_rows(point_scale, job, rows)
+    galley_from_rows(point_scale, job, rows, elided)
 }
 
 fn layout_section(
@@ -145,12 +162,18 @@ fn rows_from_paragraphs(
     fonts: &mut FontsImpl,
     paragraphs: Vec<Paragraph>,
     job: &LayoutJob,
+    elided: &mut bool,
 ) -> Vec<Row> {
     let num_paragraphs = paragraphs.len();
 
     let mut rows = vec![];
 
     for (i, paragraph) in paragraphs.into_iter().enumerate() {
+        if job.wrap.max_rows <= rows.len() {
+            *elided = true;
+            break;
+        }
+
         let is_last_paragraph = (i + 1) == num_paragraphs;
 
         if paragraph.glyphs.is_empty() {
@@ -166,7 +189,7 @@ fn rows_from_paragraphs(
         } else {
             let paragraph_max_x = paragraph.glyphs.last().unwrap().max_x();
             if paragraph_max_x <= job.wrap.max_width {
-                // early-out optimization
+                // Early-out optimization: the whole paragraph fits on one row.
                 let paragraph_min_x = paragraph.glyphs[0].pos.x;
                 rows.push(Row {
                     glyphs: paragraph.glyphs,
@@ -175,7 +198,7 @@ fn rows_from_paragraphs(
                     ends_with_newline: !is_last_paragraph,
                 });
             } else {
-                line_break(fonts, &paragraph, job, &mut rows);
+                line_break(fonts, &paragraph, job, &mut rows, elided);
                 rows.last_mut().unwrap().ends_with_newline = !is_last_paragraph;
             }
         }
@@ -189,6 +212,7 @@ fn line_break(
     paragraph: &Paragraph,
     job: &LayoutJob,
     out_rows: &mut Vec<Row>,
+    elided: &mut bool,
 ) {
     // Keeps track of good places to insert row break if we exceed `wrap_width`.
     let mut row_break_candidates = RowBreakCandidates::default();
@@ -196,16 +220,18 @@ fn line_break(
     let mut first_row_indentation = paragraph.glyphs[0].pos.x;
     let mut row_start_x = 0.0;
     let mut row_start_idx = 0;
-    let mut non_empty_rows = 0;
 
     for i in 0..paragraph.glyphs.len() {
         let potential_row_width = paragraph.glyphs[i].max_x() - row_start_x;
 
-        if job.wrap.max_rows > 0 && non_empty_rows >= job.wrap.max_rows {
+        if job.wrap.max_rows <= out_rows.len() {
+            *elided = true;
             break;
         }
 
-        if potential_row_width > job.wrap.max_width {
+        if job.wrap.max_width < potential_row_width {
+            // Row break:
+
             if first_row_indentation > 0.0
                 && !row_break_candidates.has_good_candidate(job.wrap.break_anywhere)
             {
@@ -240,10 +266,10 @@ fn line_break(
                     ends_with_newline: false,
                 });
 
+                // Start a new row:
                 row_start_idx = last_kept_index + 1;
                 row_start_x = paragraph.glyphs[row_start_idx].pos.x;
                 row_break_candidates = Default::default();
-                non_empty_rows += 1;
             } else {
                 // Found no place to break, so we have to overrun wrap_width.
             }
@@ -253,9 +279,12 @@ fn line_break(
     }
 
     if row_start_idx < paragraph.glyphs.len() {
-        if job.wrap.max_rows > 0 && non_empty_rows == job.wrap.max_rows {
+        // Final row of text:
+
+        if job.wrap.max_rows <= out_rows.len() {
             if let Some(last_row) = out_rows.last_mut() {
                 replace_last_glyph_with_overflow_character(fonts, job, last_row);
+                *elided = true;
             }
         } else {
             let glyphs: Vec<Glyph> = paragraph.glyphs[row_start_idx..]
@@ -280,6 +309,7 @@ fn line_break(
     }
 }
 
+/// Trims the last glyphs in the row and replaces it with an overflow character (e.g. `…`).
 fn replace_last_glyph_with_overflow_character(
     fonts: &mut FontsImpl,
     job: &LayoutJob,
@@ -318,6 +348,7 @@ fn replace_last_glyph_with_overflow_character(
         let (font_impl, glyph_info) = font.glyph_info_and_font_impl(last_glyph.chr);
         last_glyph.size = vec2(glyph_info.advance_width, font_height);
         last_glyph.uv_rect = glyph_info.uv_rect;
+        last_glyph.ascent = glyph_info.ascent;
 
         // reapply kerning
         last_glyph.pos.x += font_impl
@@ -325,16 +356,20 @@ fn replace_last_glyph_with_overflow_character(
             .map(|(font_impl, prev_glyph_id)| font_impl.pair_kerning(prev_glyph_id, glyph_info.id))
             .unwrap_or_default();
 
-        // check if we're still within width budget
+        row.rect.max.x = last_glyph.max_x();
+
+        // check if we're within width budget
         let row_end_x = last_glyph.max_x();
         let row_start_x = row.glyphs.first().unwrap().pos.x; // if `last_mut()` returned `Some`, then so will `first()`
         let row_width = row_end_x - row_start_x;
         if row_width <= job.wrap.max_width {
-            break;
+            return; // we are done
         }
 
         row.glyphs.pop();
     }
+
+    // We failed to insert `overflow_character` without exceeding `wrap_width`.
 }
 
 fn halign_and_justify_row(
@@ -428,7 +463,12 @@ fn halign_and_justify_row(
 }
 
 /// Calculate the Y positions and tessellate the text.
-fn galley_from_rows(point_scale: PointScale, job: Arc<LayoutJob>, mut rows: Vec<Row>) -> Galley {
+fn galley_from_rows(
+    point_scale: PointScale,
+    job: Arc<LayoutJob>,
+    mut rows: Vec<Row>,
+    elided: bool,
+) -> Galley {
     let mut first_row_min_height = job.first_row_min_height;
     let mut cursor_y = 0.0;
     let mut min_x: f32 = 0.0;
@@ -489,6 +529,7 @@ fn galley_from_rows(point_scale: PointScale, job: Arc<LayoutJob>, mut rows: Vec<
     Galley {
         job,
         rows,
+        elided,
         rect,
         mesh_bounds,
         num_vertices,

crates/epaint/src/text/text_layout_types.rs

@@ -49,6 +49,7 @@ pub struct LayoutJob {
     /// The different section, which can have different fonts, colors, etc.
     pub sections: Vec<LayoutSection>,
 
+    /// Controls the text wrapping and elision.
     pub wrap: TextWrapping,
 
     /// The first row must be at least this high.
@@ -58,15 +59,19 @@ pub struct LayoutJob {
     /// In other cases, set this to `0.0`.
     pub first_row_min_height: f32,
 
-    /// If `false`, all newlines characters will be ignored
+    /// If `true`, all `\n` characters will result in a new _paragraph_,
+    /// starting on a new row.
+    ///
+    /// If `false`, all `\n` characters will be ignored
     /// and show up as the replacement character.
+    ///
     /// Default: `true`.
     pub break_on_newline: bool,
 
     /// How to horizontally align the text (`Align::LEFT`, `Align::Center`, `Align::RIGHT`).
     pub halign: Align,
 
-    /// Justify text so that word-wrapped rows fill the whole [`TextWrapping::max_width`]
+    /// Justify text so that word-wrapped rows fill the whole [`TextWrapping::max_width`].
     pub justify: bool,
 }
 
@@ -153,7 +158,7 @@ impl LayoutJob {
         });
     }
 
-    /// The height of the tallest used font in the job.
+    /// The height of the tallest font used in the job.
     pub fn font_height(&self, fonts: &crate::Fonts) -> f32 {
         let mut max_height = 0.0_f32;
         for section in &self.sections {
@@ -266,22 +271,50 @@ impl TextFormat {
 
 // ----------------------------------------------------------------------------
 
+/// Controls the text wrapping and elision of a [`LayoutJob`].
 #[derive(Clone, Debug, PartialEq)]
 #[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
 pub struct TextWrapping {
-    /// Try to break text so that no row is wider than this.
+    /// Wrap text so that no row is wider than this.
-    /// Set to [`f32::INFINITY`] to turn off wrapping.
+    ///
-    /// Note that `\n` always produces a new line.
+    /// If you would rather truncate text that doesn't fit, set [`Self::max_rows`] to `1`.
+    ///
+    /// Set `max_width` to [`f32::INFINITY`] to turn off wrapping and elision.
+    ///
+    /// Note that `\n` always produces a new row
+    /// if [`LayoutJob::break_on_newline`] is `true`.
     pub max_width: f32,
 
-    /// Maximum amount of rows the text should have.
+    /// Maximum amount of rows the text galley should have.
-    /// Set to `0` to disable this.
+    ///
+    /// If this limit is reached, text will be truncated and
+    /// and [`Self::overflow_character`] appended to the final row.
+    /// You can detect this by checking [`Galley::elided`].
+    ///
+    /// If set to `0`, no text will be outputted.
+    ///
+    /// If set to `1`, a single row will be outputted,
+    /// eliding the text after [`Self::max_width`] is reached.
+    /// When you set `max_rows = 1`, it is recommended you also set [`Self::break_anywhere`] to `true`.
+    ///
+    /// Default value: `usize::MAX`.
     pub max_rows: usize,
 
-    /// Don't try to break text at an appropriate place.
+    /// If `true`: Allow breaking between any characters.
+    /// If `false` (default): prefer breaking between words, etc.
+    ///
+    /// NOTE: Due to limitations in the current implementation,
+    /// when truncating text using [`Self::max_rows`] the text may be truncated
+    /// in the middle of a word even if [`Self::break_anywhere`] is `false`.
+    /// Therefore it is recommended to set [`Self::break_anywhere`] to `true`
+    /// whenever [`Self::max_rows`] is set to `1`.
     pub break_anywhere: bool,
 
-    /// Character to use to represent clipped text, `…` for example, which is the default.
+    /// Character to use to represent elided text.
+    ///
+    /// The default is `…`.
+    ///
+    /// If not set, no character will be used (but the text will still be elided).
     pub overflow_character: Option<char>,
 }
 
@@ -305,13 +338,33 @@ impl Default for TextWrapping {
     fn default() -> Self {
         Self {
             max_width: f32::INFINITY,
-            max_rows: 0,
+            max_rows: usize::MAX,
             break_anywhere: false,
             overflow_character: Some('…'),
         }
     }
 }
 
+impl TextWrapping {
+    /// A row can be as long as it need to be
+    pub fn no_max_width() -> Self {
+        Self {
+            max_width: f32::INFINITY,
+            ..Default::default()
+        }
+    }
+
+    /// Elide text that doesn't fit within the given width.
+    pub fn elide_at_width(max_width: f32) -> Self {
+        Self {
+            max_width,
+            max_rows: 1,
+            break_anywhere: true,
+            ..Default::default()
+        }
+    }
+}
+
 // ----------------------------------------------------------------------------
 
 /// Text that has been laid out, ready for painting.
@@ -333,11 +386,17 @@ pub struct Galley {
     pub job: Arc<LayoutJob>,
 
     /// Rows of text, from top to bottom.
-    /// The number of characters in all rows sum up to `job.text.chars().count()`.
+    ///
-    /// Note that each paragraph (pieces of text separated with `\n`)
+    /// The number of characters in all rows sum up to `job.text.chars().count()`
+    /// unless [`Self::elided`] is `true`.
+    ///
+    /// Note that a paragraph (a piece of text separated with `\n`)
     /// can be split up into multiple rows.
     pub rows: Vec<Row>,
 
+    /// Set to true the text was truncated due to [`TextWrapping::max_rows`].
+    pub elided: bool,
+
     /// Bounding rect.
     ///
     /// `rect.top()` is always 0.0.
@@ -505,6 +564,7 @@ impl Galley {
         self.job.is_empty()
     }
 
+    /// The full, non-elided text of the input job.
     #[inline(always)]
     pub fn text(&self) -> &str {
         &self.job.text