label: Add text wrapping

src/label/mod.rs

@@ -124,6 +124,7 @@ impl Code128Config {
 pub struct TextConfig {
     font_size: f32,
     position: (Mm, Mm),
+    wrap: Option<usize>,
 }
 
 impl TextConfig {
@@ -133,15 +134,38 @@ impl TextConfig {
         font: &IndirectFontRef,
         text: Option<S>,
     ) -> Result<()> {
-        layer.use_text(
-            text.ok_or(Error::DataIncomplete("ID text".to_string()))?,
-            self.font_size,
-            self.position.0,
-            self.position.1,
-            font,
-        );
+        layer.begin_text_section();
+        layer.set_font(font, self.font_size);
+        layer.set_line_height(self.font_size);
+        layer.set_text_cursor(self.position.0, self.position.1);
+        if let Some(text) = self.wrap(text) {
+            for line in text.split('\n') {
+                layer.write_text(line, font);
+                layer.add_line_break();
+            }
+        } else {
+            return Err(Error::DataIncomplete("ID text".to_string()));
+        }
+        layer.end_text_section();
         Ok(())
     }
+
+    fn wrap<S: Into<String>>(&self, text: Option<S>) -> Option<String> {
+        if let Some(wrap) = self.wrap {
+            let mut inserted = 0;
+            text.map(|s| {
+                let s = s.into();
+                let mut chars: Vec<char> = s.chars().collect();
+                for i in (wrap..s.len()).step_by(wrap) {
+                    chars.insert(i + inserted, '\n');
+                    inserted += 1;
+                }
+                chars.iter().collect()
+            })
+        } else {
+            text.map(|s| s.into())
+        }
+    }
 }
 
 #[derive(Debug)]

src/label/preset.rs

@@ -53,14 +53,17 @@ impl Into<LabelConfig> for LabelPreset {
                 id_text: Some(TextConfig {
                     font_size: 7.0,
                     position: (Mm(0.0), Mm(22.0)),
+                    wrap: None,
                 }),
                 short_id_text: Some(TextConfig {
                     font_size: 7.0,
                     position: (Mm(21.0), Mm(0.6)),
+                    wrap: None,
                 }),
                 branding: Some(TextConfig {
                     font_size: 7.0,
                     position: (Mm(39.5), Mm(0.6)),
+                    wrap: None,
                 }),
             },
             Self::SeikoSlpMrlCode128 => LabelConfig {
@@ -74,14 +77,17 @@ impl Into<LabelConfig> for LabelPreset {
                 id_text: Some(TextConfig {
                     font_size: 7.0,
                     position: (Mm(0.0), Mm(22.0)),
+                    wrap: None,
                 }),
                 short_id_text: Some(TextConfig {
                     font_size: 7.0,
                     position: (Mm(0.0), Mm(0.0)),
+                    wrap: None,
                 }),
                 branding: Some(TextConfig {
                     font_size: 7.0,
                     position: (Mm(39.5), Mm(0.6)),
+                    wrap: None,
                 }),
             },
             Self::SeikoSlpMrl => LabelConfig {
@@ -98,14 +104,17 @@ impl Into<LabelConfig> for LabelPreset {
                 id_text: Some(TextConfig {
                     font_size: 7.0,
                     position: (Mm(0.0), Mm(22.0)),
+                    wrap: None,
                 }),
                 short_id_text: Some(TextConfig {
                     font_size: 7.0,
                     position: (Mm(17.0), Mm(0.0)),
+                    wrap: None,
                 }),
                 branding: Some(TextConfig {
                     font_size: 7.0,
                     position: (Mm(39.5), Mm(0.6)),
+                    wrap: None,
                 }),
             },
         }