ui: add note truncation

Truncate notes by default. We still need a show more button though

crates/notedeck_columns/src/timeline/route.rs

@@ -75,7 +75,12 @@ pub fn render_timeline_route(
             }
         }
 
-        TimelineKind::Thread(id) => ui::ThreadView::new(
+        TimelineKind::Thread(id) => {
+            // don't truncate thread notes for now, since they are
+            // default truncated everywher eelse
+            note_options.set_truncate(false);
+
+            ui::ThreadView::new(
                 timeline_cache,
                 unknown_ids,
                 id.selected_or_root(),
@@ -86,7 +91,8 @@ pub fn render_timeline_route(
             )
             .id_source(egui::Id::new(("threadscroll", col)))
             .ui(ui)
-        .map(Into::into),
+            .map(Into::into)
+        }
     }
 }
 

crates/notedeck_ui/src/note/contents.rs

@@ -119,6 +119,10 @@ pub fn render_note_contents(
     let hide_media = options.has_hide_media();
     let link_color = ui.visuals().hyperlink_color;
 
+    // The current length of the rendered blocks. Used in trucation logic
+    let mut current_len: usize = 0;
+    let truncate_len = 280;
+
     if !options.has_is_preview() {
         // need this for the rect to take the full width of the column
         let _ = ui.allocate_at_least(egui::vec2(ui.available_width(), 0.0), egui::Sense::click());
@@ -210,18 +214,39 @@ pub fn render_note_contents(
                 }
 
                 BlockType::Text => {
+                    // truncate logic
+                    let mut truncate = false;
+                    let block_str = if options.has_truncate()
+                        && (current_len + block.as_str().len() > truncate_len)
+                    {
+                        truncate = true;
+                        // The current block goes over the truncate length,
+                        // we'll need to truncate this block
+                        let block_str = block.as_str();
+                        let closest = notedeck::abbrev::floor_char_boundary(
+                            block_str,
+                            truncate_len - current_len,
+                        );
+                        &(block_str[..closest].to_string() + "…")
+                    } else {
+                        let block_str = block.as_str();
+                        current_len += block_str.len();
+                        block_str
+                    };
+
                     if options.has_scramble_text() {
                         ui.add(
-                            egui::Label::new(rot13(block.as_str()))
+                            egui::Label::new(rot13(block_str))
                                 .wrap()
                                 .selectable(selectable),
                         );
                     } else {
-                        ui.add(
-                            egui::Label::new(block.as_str())
-                                .wrap()
-                                .selectable(selectable),
-                        );
+                        ui.add(egui::Label::new(block_str).wrap().selectable(selectable));
+                    }
+
+                    // don't render any more blocks
+                    if truncate {
+                        break;
                     }
                 }
 

crates/notedeck_ui/src/note/mod.rs

@@ -114,6 +114,11 @@ impl<'a, 'd> NoteView<'a, 'd> {
         self
     }
 
+    pub fn truncate(mut self, enable: bool) -> Self {
+        self.options_mut().set_truncate(enable);
+        self
+    }
+
     pub fn small_pfp(mut self, enable: bool) -> Self {
         self.options_mut().set_small_pfp(enable);
         self

crates/notedeck_ui/src/note/options.rs

@@ -21,12 +21,19 @@ bitflags! {
 
         /// Whether the current note is a preview
         const is_preview      = 0b0000010000000000;
+
+        /// Is the content truncated? If the length is over a certain size it
+        /// will end with a ... and a "Show more" button.
+        const truncate        = 0b0000100000000000;
     }
 }
 
 impl Default for NoteOptions {
     fn default() -> NoteOptions {
-        NoteOptions::options_button | NoteOptions::note_previews | NoteOptions::actionbar
+        NoteOptions::options_button
+            | NoteOptions::note_previews
+            | NoteOptions::actionbar
+            | NoteOptions::truncate
     }
 }
 
@@ -60,6 +67,7 @@ impl NoteOptions {
     create_bit_methods!(set_hide_media, has_hide_media, hide_media);
     create_bit_methods!(set_scramble_text, has_scramble_text, scramble_text);
     create_bit_methods!(set_is_preview, has_is_preview, is_preview);
+    create_bit_methods!(set_truncate, has_truncate, truncate);
 
     pub fn new(is_universe_timeline: bool) -> Self {
         let mut options = NoteOptions::default();