Implement support for vertical ProgressBar

Co-authored-by: MG_REX <49415741+ThisIsRex@users.noreply.github.com>

examples/progress_bar/src/main.rs

@@ -1,4 +1,7 @@
-use iced::widget::{column, progress_bar, slider};
+use iced::widget::{
+    center, center_x, checkbox, column, progress_bar, row, slider,
+    vertical_slider,
+};
 use iced::Element;
 
 pub fn main() -> iced::Result {
@@ -8,25 +11,58 @@ pub fn main() -> iced::Result {
 #[derive(Default)]
 struct Progress {
     value: f32,
+    is_vertical: bool,
 }
 
 #[derive(Debug, Clone, Copy)]
 enum Message {
     SliderChanged(f32),
+    ToggleVertical(bool),
 }
 
 impl Progress {
     fn update(&mut self, message: Message) {
         match message {
             Message::SliderChanged(x) => self.value = x,
+            Message::ToggleVertical(is_vertical) => {
+                self.is_vertical = is_vertical
+            }
         }
     }
 
     fn view(&self) -> Element<Message> {
+        let bar = progress_bar(0.0..=100.0, self.value);
+
         column![
-            progress_bar(0.0..=100.0, self.value),
-            slider(0.0..=100.0, self.value, Message::SliderChanged).step(0.01)
+            if self.is_vertical {
+                center(
+                    row![
+                        bar.vertical(),
+                        vertical_slider(
+                            0.0..=100.0,
+                            self.value,
+                            Message::SliderChanged
+                        )
+                        .step(0.01)
                     ]
+                    .spacing(20),
+                )
+            } else {
+                center(
+                    column![
+                        bar,
+                        slider(0.0..=100.0, self.value, Message::SliderChanged)
+                            .step(0.01)
+                    ]
+                    .spacing(20),
+                )
+            },
+            center_x(
+                checkbox("Vertical", self.is_vertical)
+                    .on_toggle(Message::ToggleVertical)
+            ),
+        ]
+        .spacing(20)
         .padding(20)
         .into()
     }

widget/src/progress_bar.rs

@@ -59,8 +59,9 @@ where
 {
     range: RangeInclusive<f32>,
     value: f32,
-    width: Length,
-    height: Option<Length>,
+    length: Length,
+    girth: Length,
+    is_vertical: bool,
     class: Theme::Class<'a>,
 }
 
@@ -68,8 +69,8 @@ impl<'a, Theme> ProgressBar<'a, Theme>
 where
     Theme: Catalog,
 {
-    /// The default height of a [`ProgressBar`].
-    pub const DEFAULT_HEIGHT: f32 = 30.0;
+    /// The default girth of a [`ProgressBar`].
+    pub const DEFAULT_GIRTH: f32 = 30.0;
 
     /// Creates a new [`ProgressBar`].
     ///
@@ -80,21 +81,30 @@ where
         ProgressBar {
             value: value.clamp(*range.start(), *range.end()),
             range,
-            width: Length::Fill,
-            height: None,
+            length: Length::Fill,
+            girth: Length::from(Self::DEFAULT_GIRTH),
+            is_vertical: false,
             class: Theme::default(),
         }
     }
 
     /// Sets the width of the [`ProgressBar`].
-    pub fn width(mut self, width: impl Into<Length>) -> Self {
-        self.width = width.into();
+    pub fn length(mut self, length: impl Into<Length>) -> Self {
+        self.length = length.into();
         self
     }
 
     /// Sets the height of the [`ProgressBar`].
-    pub fn height(mut self, height: impl Into<Length>) -> Self {
-        self.height = Some(height.into());
+    pub fn girth(mut self, girth: impl Into<Length>) -> Self {
+        self.girth = girth.into();
+        self
+    }
+
+    /// Turns the [`ProgressBar`] into a vertical [`ProgressBar`].
+    ///
+    /// By default, a [`ProgressBar`] is horizontal.
+    pub fn vertical(mut self) -> Self {
+        self.is_vertical = true;
         self
     }
 
@@ -115,6 +125,22 @@ where
         self.class = class.into();
         self
     }
+
+    fn width(&self) -> Length {
+        if self.is_vertical {
+            self.girth
+        } else {
+            self.length
+        }
+    }
+
+    fn height(&self) -> Length {
+        if self.is_vertical {
+            self.length
+        } else {
+            self.girth
+        }
+    }
 }
 
 impl<Message, Theme, Renderer> Widget<Message, Theme, Renderer>
@@ -125,8 +151,8 @@ where
 {
     fn size(&self) -> Size<Length> {
         Size {
-            width: self.width,
-            height: self.height.unwrap_or(Length::Fixed(Self::DEFAULT_HEIGHT)),
+            width: self.width(),
+            height: self.height(),
         }
     }
 
@@ -136,11 +162,7 @@ where
         _renderer: &Renderer,
         limits: &layout::Limits,
     ) -> layout::Node {
-        layout::atomic(
-            limits,
-            self.width,
-            self.height.unwrap_or(Length::Fixed(Self::DEFAULT_HEIGHT)),
-        )
+        layout::atomic(limits, self.width(), self.height())
     }
 
     fn draw(
@@ -156,11 +178,16 @@ where
         let bounds = layout.bounds();
         let (range_start, range_end) = self.range.clone().into_inner();
 
-        let active_progress_width = if range_start >= range_end {
+        let length = if self.is_vertical {
+            bounds.height
+        } else {
+            bounds.width
+        };
+
+        let active_progress_length = if range_start >= range_end {
             0.0
         } else {
-            bounds.width * (self.value - range_start)
-                / (range_end - range_start)
+            length * (self.value - range_start) / (range_end - range_start)
         };
 
         let style = theme.style(&self.class);
@@ -174,13 +201,23 @@ where
             style.background,
         );
 
-        if active_progress_width > 0.0 {
+        if active_progress_length > 0.0 {
+            let bounds = if self.is_vertical {
+                Rectangle {
+                    y: bounds.y + bounds.height - active_progress_length,
+                    height: active_progress_length,
+                    ..bounds
+                }
+            } else {
+                Rectangle {
+                    width: active_progress_length,
+                    ..bounds
+                }
+            };
+
             renderer.fill_quad(
                 renderer::Quad {
-                    bounds: Rectangle {
-                        width: active_progress_width,
-                        ..bounds
-                    },
+                    bounds,
                     border: Border {
                         color: Color::TRANSPARENT,
                         ..style.border