M7: area type vertical alignment

Area Type Options > Align: Top / Center / Bottom / Justify (AreaOptions.verticalAlign,
LayoutOptions.vertical_align). Each row/column cell is aligned on its own; rectangular
cells shift their lines, other frames and text wrap reflow until settled without
losing text. Justify shares the leftover space equally between line gaps. Area Type Options
shows Align and First Baseline as dropdowns (the parameter dialog's choices table).

crates/doc/src/lib.rs

@@ -83,7 +83,7 @@ pub use slices::{CellAlign, CellVAlign, Slice, SliceArea, SliceKind, SliceOption
 pub use style_libs::StyleLibrary;
 pub use text::{
     AreaOptions, Burasagari, CharAlign, CharPosition, CharStyle, Composer, FirstBaseline, Justify, LeadingModel, Mojikumi, ParaDirection, ParaStyle,
-    PathAlign, PathEffect, ScriptMetrics, TabAlign, TabStop, TextKind, TextObject, TextRun, TextStyleDef, TextWrap, WrapShape,
+    PathAlign, PathEffect, ScriptMetrics, TabAlign, TabStop, TextKind, TextObject, TextRun, TextStyleDef, TextWrap, VerticalAlign, WrapShape,
 };
 pub use vectorcraft_color as color;
 pub use vectorcraft_geom as geom;

crates/doc/src/text.rs

@@ -532,6 +532,34 @@ pub enum FirstBaseline {
     Fixed,
 }
 
+/// Area Type Options "Align" (vertical): where the lines of each row/column sit in it.
+#[derive(Clone, Copy, Debug, Default, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub enum VerticalAlign {
+    /// Lines start at the top of the cell (the default).
+    #[default]
+    Top,
+    /// The block of lines is centred in the cell.
+    Center,
+    /// The last line's descent touches the cell bottom.
+    Bottom,
+    /// The first line stays at the top, the last one moves to the bottom and the space left over
+    /// is shared equally between the lines (no paragraph spacing limit).
+    Justify,
+}
+
+impl VerticalAlign {
+    pub const ALL: [VerticalAlign; 4] = [VerticalAlign::Top, VerticalAlign::Center, VerticalAlign::Bottom, VerticalAlign::Justify];
+    pub fn id(self) -> &'static str {
+        match self {
+            VerticalAlign::Top => "top",
+            VerticalAlign::Center => "center",
+            VerticalAlign::Bottom => "bottom",
+            VerticalAlign::Justify => "justify",
+        }
+    }
+}
+
 /// Text Wrap Options of a wrap object (Object → Text Wrap).
 #[derive(Clone, Copy, Debug, PartialEq, Serialize, Deserialize)]
 #[serde(default)]
@@ -634,11 +662,21 @@ pub struct AreaOptions {
     pub first_baseline: FirstBaseline,
     /// Minimum first-baseline offset in points.
     pub first_baseline_min: f64,
+    /// Vertical alignment of the lines in each row/column.
+    pub vertical_align: VerticalAlign,
 }
 
 impl Default for AreaOptions {
     fn default() -> Self {
-        Self { rows: 1, columns: 1, gutter: 18.0, inset: 0.0, first_baseline: FirstBaseline::Ascent, first_baseline_min: 0.0 }
+        Self {
+            rows: 1,
+            columns: 1,
+            gutter: 18.0,
+            inset: 0.0,
+            first_baseline: FirstBaseline::Ascent,
+            first_baseline_min: 0.0,
+            vertical_align: VerticalAlign::Top,
+        }
     }
 }