Introduce helper methods for alignment for all widgets

core/src/alignment.rs

@@ -1,5 +1,30 @@
 //! Align and position widgets.
 
+/// Returns a value representing center alignment.
+pub const fn center() -> Alignment {
+    Alignment::Center
+}
+
+/// Returns a value representing left alignment.
+pub const fn left() -> Horizontal {
+    Horizontal::Left
+}
+
+/// Returns a value representing right alignment.
+pub const fn right() -> Horizontal {
+    Horizontal::Right
+}
+
+/// Returns a value representing top alignment.
+pub const fn top() -> Vertical {
+    Vertical::Top
+}
+
+/// Returns a value representing bottom alignment.
+pub const fn bottom() -> Vertical {
+    Vertical::Bottom
+}
+
 /// Alignment on the axis of a container.
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
 pub enum Alignment {
@@ -46,6 +71,16 @@ pub enum Horizontal {
     Right,
 }
 
+impl From<Alignment> for Horizontal {
+    fn from(alignment: Alignment) -> Self {
+        match alignment {
+            Alignment::Start => Self::Left,
+            Alignment::Center => Self::Center,
+            Alignment::End => Self::Right,
+        }
+    }
+}
+
 /// The vertical [`Alignment`] of some resource.
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
 pub enum Vertical {
@@ -58,3 +93,13 @@ pub enum Vertical {
     /// Align bottom
     Bottom,
 }
+
+impl From<Alignment> for Vertical {
+    fn from(alignment: Alignment) -> Self {
+        match alignment {
+            Alignment::Start => Self::Top,
+            Alignment::Center => Self::Center,
+            Alignment::End => Self::Bottom,
+        }
+    }
+}

core/src/pixels.rs

@@ -6,7 +6,7 @@
 /// (e.g. `impl Into<Pixels>`) and, since `Pixels` implements `From` both for
 /// `f32` and `u16`, you should be able to provide both integers and float
 /// literals as needed.
-#[derive(Debug, Clone, Copy, PartialEq, PartialOrd)]
+#[derive(Debug, Clone, Copy, PartialEq, PartialOrd, Default)]
 pub struct Pixels(pub f32);
 
 impl From<f32> for Pixels {
@@ -27,6 +27,30 @@ impl From<Pixels> for f32 {
     }
 }
 
+impl std::ops::Add for Pixels {
+    type Output = Pixels;
+
+    fn add(self, rhs: Self) -> Self {
+        Pixels(self.0 + rhs.0)
+    }
+}
+
+impl std::ops::Add<f32> for Pixels {
+    type Output = Pixels;
+
+    fn add(self, rhs: f32) -> Self {
+        Pixels(self.0 + rhs)
+    }
+}
+
+impl std::ops::Mul for Pixels {
+    type Output = Pixels;
+
+    fn mul(self, rhs: Self) -> Self {
+        Pixels(self.0 * rhs.0)
+    }
+}
+
 impl std::ops::Mul<f32> for Pixels {
     type Output = Pixels;
 

core/src/widget/text.rs

@@ -86,21 +86,56 @@ where
         self
     }
 
+    /// Centers the [`Text`], both horizontally and vertically.
+    pub fn center(self) -> Self {
+        self.center_x().center_y()
+    }
+
+    /// Centers the [`Text`] horizontally.
+    pub fn center_x(self) -> Self {
+        self.align_x(alignment::center())
+    }
+
+    /// Aligns the [`Text`] to the left, the default.
+    pub fn align_left(self) -> Self {
+        self.align_x(alignment::left())
+    }
+
+    /// Aligns the [`Text`] to the right.
+    pub fn align_right(self) -> Self {
+        self.align_x(alignment::right())
+    }
+
+    /// Centers the [`Text`] vertically.
+    pub fn center_y(self) -> Self {
+        self.align_y(alignment::center())
+    }
+
+    /// Aligns the [`Text`] to the top, the default.
+    pub fn align_top(self) -> Self {
+        self.align_y(alignment::top())
+    }
+
+    /// Aligns the [`Text`] to the bottom.
+    pub fn align_bottom(self) -> Self {
+        self.align_y(alignment::bottom())
+    }
+
     /// Sets the [`alignment::Horizontal`] of the [`Text`].
-    pub fn horizontal_alignment(
+    pub fn align_x(
         mut self,
-        alignment: alignment::Horizontal,
+        alignment: impl Into<alignment::Horizontal>,
     ) -> Self {
-        self.horizontal_alignment = alignment;
+        self.horizontal_alignment = alignment.into();
         self
     }
 
     /// Sets the [`alignment::Vertical`] of the [`Text`].
-    pub fn vertical_alignment(
+    pub fn align_y(
         mut self,
-        alignment: alignment::Vertical,
+        alignment: impl Into<alignment::Vertical>,
     ) -> Self {
-        self.vertical_alignment = alignment;
+        self.vertical_alignment = alignment.into();
         self
     }