add some comments, rework lifetimes of table row

egui_dynamic_grid/src/grid/horizontal.rs

@@ -51,7 +51,6 @@ impl<'a> HorizontalGridBuilder<'a> {
             widths,
         };
         horizontal_grid(grid);
-        layout.done();
     }
 }
 

egui_dynamic_grid/src/grid/vertical.rs

@@ -51,7 +51,6 @@ impl<'a> VerticalGridBuilder<'a> {
             heights,
         };
         vertical_grid(grid);
-        layout.done();
     }
 }
 

egui_dynamic_grid/src/layout.rs

@@ -15,8 +15,9 @@ pub(crate) enum LineDirection {
     TopToBottom,
 }
 
-pub struct Layout<'a> {
-    ui: &'a mut Ui,
+/// Positions cells in [LineDirection] and starts a new line on [Layout::end_line]
+pub struct Layout<'l> {
+    ui: &'l mut Ui,
     padding: Padding,
     direction: LineDirection,
     rect: Rect,
@@ -24,8 +25,8 @@ pub struct Layout<'a> {
     max: Pos2,
 }
 
-impl<'a> Layout<'a> {
-    pub(crate) fn new(ui: &'a mut Ui, padding: Padding, direction: LineDirection) -> Self {
+impl<'l> Layout<'l> {
+    pub(crate) fn new(ui: &'l mut Ui, padding: Padding, direction: LineDirection) -> Self {
         let mut rect = ui.available_rect_before_wrap();
         rect.set_left(rect.left() + padding.outer + padding.inner);
         rect.set_top(rect.top() + padding.outer + padding.inner);
@@ -128,6 +129,7 @@ impl<'a> Layout<'a> {
         }
     }
 
+    /// Set the rect so that the scrollview knows about our size
     fn set_rect(&mut self) {
         let mut rect = self.rect;
         rect.set_right(self.max.x);
@@ -137,15 +139,6 @@ impl<'a> Layout<'a> {
             .allocate_rect(rect, Sense::focusable_noninteractive());
     }
 
-    pub fn done(&mut self) {
-        self.set_rect();
-    }
-
-    pub fn done_ui(mut self) -> &'a mut Ui {
-        self.set_rect();
-        self.ui
-    }
-
     fn cell(&mut self, rect: Rect, clip: bool, add_contents: impl FnOnce(&mut Ui)) {
         let mut child_ui = self.ui.child_ui(rect, *self.ui.layout());
 
@@ -163,3 +156,9 @@ impl<'a> Layout<'a> {
         add_contents(&mut child_ui)
     }
 }
+
+impl<'a> Drop for Layout<'a> {
+    fn drop(&mut self) {
+        self.set_rect()
+    }
+}

egui_dynamic_grid/src/padding.rs

@@ -1,5 +1,5 @@
 /// Configure padding of grid or table
-/// TODO: Use padding settings of egui?
+/// TODO: Use padding settings of egui/should we extend egui padding settings for table?
 #[derive(Clone, Debug)]
 pub struct Padding {
     pub(crate) inner: f32,

egui_dynamic_grid/src/sizing.rs

@@ -1,3 +1,4 @@
+/// Size hint for table column/grid cell
 #[derive(Clone, Debug)]
 pub enum Size {
     /// Absolute size in points

egui_dynamic_grid/src/table.rs

@@ -1,3 +1,6 @@
+/// Table view with (optional) fixed header and scrolling body.
+/// Cell widths are precalculated with given size hints so we can have tables like this:
+/// | fixed size | all available space/minimum | 30% of available width | fixed size |
 use crate::{
     layout::{CellSize, LineDirection},
     sizing::Sizing,
@@ -53,23 +56,22 @@ impl<'a> TableBuilder<'a> {
         self
     }
 
-    pub fn header<F>(self, height: f32, header: F) -> Table<'a>
-    where
-        F: for<'b> FnOnce(TableRow<'a, 'b>),
-    {
+    pub fn header(self, height: f32, header: impl FnOnce(TableRow<'_, '_>)) -> Table<'a> {
         let widths = self.sizing.into_lengths();
-        let mut layout = Layout::new(self.ui, self.padding.clone(), LineDirection::TopToBottom);
+        let ui = self.ui;
         {
-            let row = TableRow {
-                layout: &mut layout,
-                widths: widths.clone(),
-                striped: false,
-                height,
-                clicked: false,
-            };
-            header(row);
+            let mut layout = Layout::new(ui, self.padding.clone(), LineDirection::TopToBottom);
+            {
+                let row = TableRow {
+                    layout: &mut layout,
+                    widths: widths.clone(),
+                    striped: false,
+                    height,
+                    clicked: false,
+                };
+                header(row);
+            }
         }
-        let ui = layout.done_ui();
 
         Table {
             ui,
@@ -132,8 +134,8 @@ impl<'a> Table<'a> {
     }
 }
 
-pub struct TableBody<'b> {
-    layout: Layout<'b>,
+pub struct TableBody<'a> {
+    layout: Layout<'a>,
     widths: Vec<f32>,
     striped: bool,
     odd: bool,
@@ -196,7 +198,7 @@ impl<'a> TableBody<'a> {
         }
     }
 
-    pub fn row<'b>(&'b mut self, height: f32, row: impl FnOnce(TableRow<'a, 'b>)) {
+    pub fn row(&mut self, height: f32, row: impl FnOnce(TableRow<'_, 'a>)) {
         row(TableRow {
             layout: &mut self.layout,
             widths: self.widths.clone(),
@@ -209,14 +211,8 @@ impl<'a> TableBody<'a> {
     }
 }
 
-impl<'a> Drop for TableBody<'a> {
-    fn drop(&mut self) {
-        self.layout.done();
-    }
-}
-
 pub struct TableRow<'a, 'b> {
-    layout: &'b mut Layout<'a>,
+    layout: &'a mut Layout<'b>,
     widths: Vec<f32>,
     striped: bool,
     height: f32,