Pass AlignHints to set_rect, not size_rules

crates/kas-core/src/core/layout.rs

@@ -7,7 +7,7 @@
 
 use crate::event::ConfigCx;
 use crate::geom::{Coord, Offset, Rect};
-use crate::layout::{AxisInfo, SizeRules};
+use crate::layout::{AlignHints, AxisInfo, SizeRules};
 use crate::theme::{DrawCx, SizeCx};
 use crate::util::IdentifyWidget;
 use crate::{HasId, Id};
@@ -168,12 +168,10 @@ pub trait Layout {
     /// outside of its assigned `rect` and to not function as normal.
     ///
     /// The assigned `rect` may be larger than the widget's size requirements,
-    /// regardless of the [`Stretch`] policy used. If the widget should never
-    /// stretch, it must align itself.
-    /// Example: the `CheckBox` widget uses an [`AlignPair`] (set from
-    /// `size_rules`'s [`AxisInfo`]) and uses [`ConfigCx::align_feature`].
-    /// Another example: `Label` uses a `Text` object which handles alignment
-    /// internally.
+    /// regardless of the [`Stretch`] policy used: containers divide up space
+    /// based on children's [`SizeRules`] but do not attempt to align content
+    /// when excess space is available. Instead, content is responsible for
+    /// aligning itself using the provided `hints` and/or local information.
     ///
     /// Required: [`Self::size_rules`] is called for both axes before this
     /// method is called, and that this method has been called *after* the last
@@ -184,8 +182,8 @@ pub trait Layout {
     /// field of `widget_core!()` to the input `rect`.
     ///
     /// [`Stretch`]: crate::layout::Stretch
-    fn set_rect(&mut self, cx: &mut ConfigCx, rect: Rect) {
-        let _ = (cx, rect);
+    fn set_rect(&mut self, cx: &mut ConfigCx, rect: Rect, hints: AlignHints) {
+        let _ = (cx, rect, hints);
         unimplemented!() // make rustdoc show that this is a provided method
     }
 

crates/kas-core/src/core/node.rs

@@ -8,7 +8,7 @@
 use super::Widget;
 use crate::event::{ConfigCx, Event, EventCx, IsUsed};
 use crate::geom::{Coord, Rect};
-use crate::layout::{AxisInfo, SizeRules};
+use crate::layout::{AlignHints, AxisInfo, SizeRules};
 use crate::theme::{DrawCx, SizeCx};
 use crate::{Id, Layout, NavAdvance};
 
@@ -25,7 +25,7 @@ trait NodeT {
     fn for_child_node(&mut self, index: usize, f: Box<dyn FnOnce(Node<'_>) + '_>);
 
     fn size_rules(&mut self, sizer: SizeCx, axis: AxisInfo) -> SizeRules;
-    fn set_rect(&mut self, cx: &mut ConfigCx, rect: Rect);
+    fn set_rect(&mut self, cx: &mut ConfigCx, rect: Rect, hints: AlignHints);
 
     fn nav_next(&self, reverse: bool, from: Option<usize>) -> Option<usize>;
     fn find_id(&mut self, coord: Coord) -> Option<Id>;
@@ -73,8 +73,8 @@ impl<'a, T> NodeT for (&'a mut dyn Widget<Data = T>, &'a T) {
     fn size_rules(&mut self, sizer: SizeCx, axis: AxisInfo) -> SizeRules {
         self.0.size_rules(sizer, axis)
     }
-    fn set_rect(&mut self, cx: &mut ConfigCx, rect: Rect) {
-        self.0.set_rect(cx, rect);
+    fn set_rect(&mut self, cx: &mut ConfigCx, rect: Rect, hints: AlignHints) {
+        self.0.set_rect(cx, rect, hints);
     }
 
     fn nav_next(&self, reverse: bool, from: Option<usize>) -> Option<usize> {
@@ -293,8 +293,8 @@ impl<'a> Node<'a> {
     }
 
     /// Set size and position
-    pub(crate) fn set_rect(&mut self, cx: &mut ConfigCx, rect: Rect) {
-        self.0.set_rect(cx, rect);
+    pub(crate) fn set_rect(&mut self, cx: &mut ConfigCx, rect: Rect, hints: AlignHints) {
+        self.0.set_rect(cx, rect, hints);
     }
 
     /// Navigation in spatial order

crates/kas-core/src/decorations.rs

@@ -121,14 +121,14 @@ impl_scope! {
     }
 
     impl Layout for Self {
-        fn size_rules(&mut self, sizer: SizeCx, mut axis: AxisInfo) -> SizeRules {
-            axis.set_default_align_hv(Align::Center, Align::Center);
+        fn size_rules(&mut self, sizer: SizeCx, axis: AxisInfo) -> SizeRules {
             sizer.text_rules(&mut self.text, axis)
         }
 
-        fn set_rect(&mut self, cx: &mut ConfigCx, rect: Rect) {
+        fn set_rect(&mut self, cx: &mut ConfigCx, rect: Rect, hints: AlignHints) {
             self.core.rect = rect;
-            cx.text_set_size(&mut self.text, rect.size);
+            let align = hints.complete(Align::Center, Align::Center);
+            cx.text_set_size(&mut self.text, rect.size, align);
         }
 
         fn draw(&mut self, mut draw: DrawCx) {

crates/kas-core/src/event/cx/config.rs

@@ -140,7 +140,13 @@ impl<'a> ConfigCx<'a> {
     ///
     /// Call [`text_configure`][Self::text_configure] before this method.
     #[inline]
-    pub fn text_set_size<T: FormattableText>(&self, text: &mut Text<T>, size: Size) {
+    pub fn text_set_size<T: FormattableText>(
+        &self,
+        text: &mut Text<T>,
+        size: Size,
+        align: AlignPair,
+    ) {
+        text.set_align(align.into());
         text.set_bounds(size.cast());
         text.prepare().expect("not configured");
     }

crates/kas-core/src/hidden.rs

@@ -12,7 +12,7 @@
 use crate::classes::HasStr;
 use crate::event::{ConfigCx, Event, EventCx, IsUsed};
 use crate::geom::{Coord, Offset, Rect};
-use crate::layout::{Align, AxisInfo, SizeRules};
+use crate::layout::{Align, AlignHints, AxisInfo, SizeRules};
 use crate::theme::{DrawCx, SizeCx, Text, TextClass};
 use crate::{Events, Id, Layout, NavAdvance, Node, Widget};
 use kas_macros::{autoimpl, impl_scope};
@@ -45,14 +45,14 @@ impl_scope! {
 
     impl Layout for Self {
         #[inline]
-        fn size_rules(&mut self, sizer: SizeCx, mut axis: AxisInfo) -> SizeRules {
-            axis.set_default_align_hv(Align::Default, Align::Center);
+        fn size_rules(&mut self, sizer: SizeCx, axis: AxisInfo) -> SizeRules {
             sizer.text_rules(&mut self.text, axis)
         }
 
-        fn set_rect(&mut self, cx: &mut ConfigCx, rect: Rect) {
+        fn set_rect(&mut self, cx: &mut ConfigCx, rect: Rect, hints: AlignHints) {
             self.core.rect = rect;
-            cx.text_set_size(&mut self.text, rect.size);
+            let align = hints.complete(Align::Default, Align::Center);
+            cx.text_set_size(&mut self.text, rect.size, align);
         }
 
         fn draw(&mut self, mut draw: DrawCx) {
@@ -135,8 +135,8 @@ impl_scope! {
         }
 
         #[inline]
-        fn set_rect(&mut self, cx: &mut ConfigCx, rect: Rect) {
-            self.inner.set_rect(cx, rect);
+        fn set_rect(&mut self, cx: &mut ConfigCx, rect: Rect, hints: AlignHints) {
+            self.inner.set_rect(cx, rect, hints);
         }
 
         #[inline]

crates/kas-core/src/layout/align.rs

@@ -108,10 +108,20 @@ impl AlignHints {
         (self.horiz.unwrap_or(horiz), self.vert.unwrap_or(vert))
     }
 
-    /// Complete via default alignments
+    /// Complete, using specified alignments as defaults
     pub fn complete(&self, horiz: Align, vert: Align) -> AlignPair {
         AlignPair::new(self.horiz.unwrap_or(horiz), self.vert.unwrap_or(vert))
     }
+
+    /// Complete, using [`Align::Default`] as defaults
+    pub fn complete_default(&self) -> AlignPair {
+        self.complete(Align::Default, Align::Default)
+    }
+
+    /// Complete, using [`Align::Center`] as defaults
+    pub fn complete_center(&self) -> AlignPair {
+        self.complete(Align::Center, Align::Center)
+    }
 }
 
 /// Provides alignment information on both axes along with ideal size
@@ -180,10 +190,17 @@ impl AlignPair {
     }
 }
 
+impl From<(Align, Align)> for AlignHints {
+    #[inline]
+    fn from((h, v): (Align, Align)) -> Self {
+        AlignHints::new(Some(h), Some(v))
+    }
+}
+
 impl From<(Align, Align)> for AlignPair {
     #[inline]
-    fn from(p: (Align, Align)) -> Self {
-        AlignPair::new(p.0, p.1)
+    fn from((h, v): (Align, Align)) -> Self {
+        AlignPair::new(h, v)
     }
 }
 

crates/kas-core/src/layout/mod.rs

@@ -67,30 +67,21 @@ pub struct AxisInfo {
     vertical: bool,
     has_fixed: bool,
     other_axis: i32,
-    align: Option<Align>,
 }
 
 impl AxisInfo {
     /// Construct with direction and an optional value for the other axis
     ///
     /// This method is *usually* not required by user code.
     #[inline]
-    pub fn new(vertical: bool, fixed: Option<i32>, align: Option<Align>) -> Self {
+    pub fn new(vertical: bool, fixed: Option<i32>) -> Self {
         AxisInfo {
             vertical,
             has_fixed: fixed.is_some(),
             other_axis: fixed.unwrap_or(0),
-            align,
         }
     }
 
-    /// Construct a copy using the given alignment hints
-    #[inline]
-    pub fn with_align_hints(mut self, hints: AlignHints) -> Self {
-        self.align = hints.extract(self).or(self.align);
-        self
-    }
-
     /// True if the current axis is vertical
     #[inline]
     pub fn is_vertical(self) -> bool {
@@ -103,61 +94,6 @@ impl AxisInfo {
         !self.vertical
     }
 
-    /// Get align parameter
-    #[inline]
-    pub fn align(self) -> Option<Align> {
-        self.align
-    }
-
-    /// Set align parameter
-    #[inline]
-    pub fn set_align(&mut self, align: Option<Align>) {
-        self.align = align;
-    }
-
-    /// Set default alignment
-    ///
-    /// If the optional alignment parameter is `None`, replace with `align`.
-    #[inline]
-    pub fn set_default_align(&mut self, align: Align) {
-        if self.align.is_none() {
-            self.align = Some(align);
-        }
-    }
-
-    /// Set default alignment
-    ///
-    /// If the optional alignment parameter is `None`, replace with either
-    /// `horiz` or `vert` depending on this axis' orientation.
-    #[inline]
-    pub fn set_default_align_hv(&mut self, horiz: Align, vert: Align) {
-        if self.align.is_none() {
-            if self.is_horizontal() {
-                self.align = Some(horiz);
-            } else {
-                self.align = Some(vert);
-            }
-        }
-    }
-
-    /// Get align parameter, defaulting to [`Align::Default`]
-    #[inline]
-    pub fn align_or_default(self) -> Align {
-        self.align.unwrap_or(Align::Default)
-    }
-
-    /// Get align parameter, defaulting to [`Align::Center`]
-    #[inline]
-    pub fn align_or_center(self) -> Align {
-        self.align.unwrap_or(Align::Center)
-    }
-
-    /// Get align parameter, defaulting to [`Align::Stretch`]
-    #[inline]
-    pub fn align_or_stretch(self) -> Align {
-        self.align.unwrap_or(Align::Stretch)
-    }
-
     /// Size of other axis, if fixed
     #[inline]
     pub fn other(&self) -> Option<i32> {

crates/kas-core/src/layout/size_types.rs

@@ -238,8 +238,6 @@ impl_scope! {
         ///
         /// If is `None`, max size is limited to ideal size.
         pub stretch: Stretch,
-        /// Alignment (set by `Self::size_rules`)
-        align: AlignPair,
     }
 }
 
@@ -256,14 +254,13 @@ impl PixmapScaling {
             .size
             .to_physical(scale_factor * self.ideal_factor)
             .extract(axis);
-        self.align.set_component(axis, axis.align_or_center());
         SizeRules::new(min, ideal, margins, self.stretch)
     }
 
     /// Constrains and aligns within `rect`
     ///
     /// The resulting size is then aligned using the `align` hints, defaulting to centered.
-    pub fn align_rect(&mut self, rect: Rect, scale_factor: f32) -> Rect {
+    pub fn align_rect(&mut self, rect: Rect, align: AlignPair, scale_factor: f32) -> Rect {
         let mut size = rect.size;
 
         if self.stretch == Stretch::None {
@@ -283,7 +280,7 @@ impl PixmapScaling {
             }
         }
 
-        self.align.aligned_rect(size, rect)
+        align.aligned_rect(size, rect)
     }
 }
 

crates/kas-core/src/layout/sizer.rs

@@ -5,10 +5,11 @@
 
 //! Layout solver
 
-use super::{Align, AxisInfo, Margins, SizeRules};
+use super::{AxisInfo, Margins, SizeRules};
 use crate::cast::Conv;
 use crate::event::ConfigCx;
 use crate::geom::{Rect, Size};
+use crate::layout::AlignHints;
 use crate::theme::SizeCx;
 use crate::util::WidgetHierarchy;
 use crate::{Layout, Node};
@@ -76,11 +77,9 @@ pub fn solve_size_rules<W: Layout + ?Sized>(
     sizer: SizeCx,
     x_size: Option<i32>,
     y_size: Option<i32>,
-    h_align: Option<Align>,
-    v_align: Option<Align>,
 ) {
-    widget.size_rules(sizer.re(), AxisInfo::new(false, y_size, h_align));
-    widget.size_rules(sizer.re(), AxisInfo::new(true, x_size, v_align));
+    widget.size_rules(sizer.re(), AxisInfo::new(false, y_size));
+    widget.size_rules(sizer.re(), AxisInfo::new(true, x_size));
 }
 
 /// Size solver
@@ -137,8 +136,8 @@ impl SolveCache {
     pub fn find_constraints(mut widget: Node<'_>, sizer: SizeCx) -> Self {
         let start = std::time::Instant::now();
 
-        let w = widget.size_rules(sizer.re(), AxisInfo::new(false, None, None));
-        let h = widget.size_rules(sizer.re(), AxisInfo::new(true, Some(w.ideal_size()), None));
+        let w = widget.size_rules(sizer.re(), AxisInfo::new(false, None));
+        let h = widget.size_rules(sizer.re(), AxisInfo::new(true, Some(w.ideal_size())));
 
         let min = Size(w.min_size(), h.min_size());
         let ideal = Size(w.ideal_size(), h.ideal_size());
@@ -197,14 +196,14 @@ impl SolveCache {
         // internal layout solving.
         if self.refresh_rules || width != self.last_width {
             if self.refresh_rules {
-                let w = widget.size_rules(cx.size_cx(), AxisInfo::new(false, None, None));
+                let w = widget.size_rules(cx.size_cx(), AxisInfo::new(false, None));
                 self.min.0 = w.min_size();
                 self.ideal.0 = w.ideal_size();
                 self.margins.horiz = w.margins();
                 width = rect.size.0 - self.margins.sum_horiz();
             }
 
-            let h = widget.size_rules(cx.size_cx(), AxisInfo::new(true, Some(width), None));
+            let h = widget.size_rules(cx.size_cx(), AxisInfo::new(true, Some(width)));
             self.min.1 = h.min_size();
             self.ideal.1 = h.ideal_size();
             self.margins.vert = h.margins();
@@ -216,7 +215,7 @@ impl SolveCache {
             rect.size.0 = width;
             rect.size.1 -= self.margins.sum_vert();
         }
-        widget.set_rect(cx, rect);
+        widget.set_rect(cx, rect, AlignHints::NONE);
 
         log::trace!(target: "kas_perf::layout", "apply_rect: {}μs", start.elapsed().as_micros());
         self.refresh_rules = false;