Select buttons

examples/manual-tabs.rs

@@ -0,0 +1,34 @@
+//! This example show show to use a stack of buttons and a switcher to achieve a
+//! tab-like widget.
+
+use std::collections::HashMap;
+
+use gooey::value::{Dynamic, Switchable};
+use gooey::widget::MakeWidget;
+use gooey::Run;
+
+#[derive(Debug, Eq, PartialEq, Clone, Hash)]
+enum Tab {
+    First,
+    Second,
+    Missing,
+}
+
+fn main() -> gooey::Result {
+    let mut tab_contents = HashMap::new();
+    tab_contents.insert(Tab::First, "This is the first tab!".make_widget());
+    tab_contents.insert(Tab::Second, "This is the second tab!".make_widget());
+
+    let selected_tab = Dynamic::new(Tab::First);
+
+    let tabs = selected_tab
+        .new_select(Tab::First, "First")
+        .and(selected_tab.new_select(Tab::Second, "Second"))
+        .and(selected_tab.new_select(Tab::Missing, "Missing"))
+        .into_columns();
+
+    tabs.and(selected_tab.switch_between(tab_contents))
+        .into_rows()
+        .fit_vertically()
+        .run()
+}

examples/select.rs

@@ -0,0 +1,23 @@
+use gooey::value::Dynamic;
+use gooey::widget::MakeWidget;
+use gooey::Run;
+
+#[derive(Default, Eq, PartialEq, Debug, Clone, Copy)]
+pub enum Choice {
+    #[default]
+    A,
+    B,
+    C,
+}
+
+fn main() -> gooey::Result {
+    let option = Dynamic::default();
+
+    option
+        .new_select(Choice::A, "A")
+        .and(option.new_select(Choice::B, "B"))
+        .and(option.new_select(Choice::C, "C"))
+        .into_rows()
+        .centered()
+        .run()
+}

src/value.rs

@@ -1,7 +1,9 @@
 //! Types for storing and interacting with values in Widgets.
 
+use std::collections::HashMap;
 use std::fmt::{Debug, Display};
 use std::future::Future;
+use std::hash::{BuildHasher, Hash};
 use std::ops::{Deref, DerefMut, Not};
 use std::panic::UnwindSafe;
 use std::str::FromStr;
@@ -12,13 +14,14 @@ use std::thread::ThreadId;
 use std::time::Duration;
 
 use ahash::AHashSet;
+use kempt::{Map, Sort};
 
 use crate::animation::{AnimationHandle, DynamicTransition, IntoAnimate, LinearInterpolate, Spawn};
 use crate::context::sealed::WindowHandle;
 use crate::context::{self, WidgetContext};
 use crate::utils::{run_in_bg, IgnorePoison, UnwindsafeCondvar, WithClone};
-use crate::widget::{MakeWidget, WidgetId, WidgetInstance};
-use crate::widgets::{Radio, Space, Switcher};
+use crate::widget::{Children, MakeWidget, WidgetId, WidgetInstance};
+use crate::widgets::{Radio, Select, Space, Switcher};
 
 /// An instance of a value that provides APIs to observe and react to its
 /// contents.
@@ -550,13 +553,28 @@ impl<T> Dynamic<T> {
     where
         Self: Clone,
         // Technically this trait bound isn't necessary, but it prevents trying
-        // to call into_radio on unsupported types. The MakeWidget/Widget
+        // to call new_radio on unsupported types. The MakeWidget/Widget
         // implementations require these bounds (and more).
         T: Clone + Eq,
     {
         Radio::new(widget_value, self.clone(), label)
     }
 
+    /// Returns a new [`Select`] that updates this dynamic to `widget_value`
+    /// when pressed. `label` is drawn next to the checkbox and is also
+    /// clickable to select the widget.
+    #[must_use]
+    pub fn new_select(&self, widget_value: T, label: impl MakeWidget) -> Select<T>
+    where
+        Self: Clone,
+        // Technically this trait bound isn't necessary, but it prevents trying
+        // to call new_select on unsupported types. The MakeWidget/Widget
+        // implementations require these bounds (and more).
+        T: Clone + Eq,
+    {
+        Select::new(widget_value, self.clone(), label)
+    }
+
     /// Validates the contents of this dynamic using the `check` function,
     /// returning a dynamic that contains the validation status.
     #[must_use]
@@ -1287,6 +1305,56 @@ pub trait Switchable<T>: IntoDynamic<T> + Sized {
     {
         Switcher::mapping(self, map)
     }
+
+    /// Returns a new [`Switcher`] whose contents switches between the values
+    /// contained in `map` using the value in `self` as the key.
+    fn switch_between<Collection>(self, map: Collection) -> Switcher
+    where
+        Collection: GetWidget<T> + Send + 'static,
+        T: Send + 'static,
+    {
+        Switcher::mapping(self, move |key, _| {
+            map.get(key)
+                .map_or_else(|| Space::clear().make_widget(), Clone::clone)
+        })
+    }
+}
+
+/// A collection of widgets that can be queried by `Key`.
+pub trait GetWidget<Key> {
+    /// Returns the widget associated with `key`, if found.
+    fn get<'a>(&'a self, key: &Key) -> Option<&'a WidgetInstance>;
+}
+
+impl<Key, State> GetWidget<Key> for HashMap<Key, WidgetInstance, State>
+where
+    Key: Hash + Eq,
+    State: BuildHasher,
+{
+    fn get<'a>(&'a self, key: &Key) -> Option<&'a WidgetInstance> {
+        HashMap::get(self, key)
+    }
+}
+
+impl<Key> GetWidget<Key> for Map<Key, WidgetInstance>
+where
+    Key: Sort,
+{
+    fn get<'a>(&'a self, key: &Key) -> Option<&'a WidgetInstance> {
+        Map::get(self, key)
+    }
+}
+
+impl GetWidget<usize> for Children {
+    fn get<'a>(&'a self, key: &usize) -> Option<&'a WidgetInstance> {
+        (**self).get(*key)
+    }
+}
+
+impl GetWidget<usize> for Vec<WidgetInstance> {
+    fn get<'a>(&'a self, key: &usize) -> Option<&'a WidgetInstance> {
+        (**self).get(*key)
+    }
 }
 
 impl<T, W> Switchable<T> for W where W: IntoDynamic<T> {}

src/widgets.rs

@@ -16,6 +16,7 @@ pub mod progress;
 mod radio;
 mod resize;
 pub mod scroll;
+pub mod select;
 pub mod slider;
 mod space;
 pub mod stack;
@@ -41,6 +42,7 @@ pub use progress::ProgressBar;
 pub use radio::Radio;
 pub use resize::Resize;
 pub use scroll::Scroll;
+pub use select::Select;
 pub use slider::Slider;
 pub use space::Space;
 pub use stack::Stack;

src/widgets/radio.rs

@@ -1,4 +1,4 @@
-//! A tri-state, labelable checkbox widget.
+//! A labeled widget with a circular indicator representing a value.
 use std::fmt::Debug;
 use std::panic::UnwindSafe;
 
@@ -14,12 +14,11 @@ use crate::widget::{MakeWidget, Widget, WidgetInstance};
 use crate::widgets::button::ButtonKind;
 use crate::ConstraintLimit;
 
-/// A labeled-widget that supports three states: Checked, Unchecked, and
-/// Indeterminant
+/// A labeled widget with a circular indicator representing a value.
 pub struct Radio<T> {
     /// The value this button represents.
     pub value: T,
-    /// The state (value) of the checkbox.
+    /// The state (value) of the radio.
     pub state: Dynamic<T>,
     /// The button kind to use as the basis for this radio. Radios default to
     /// [`ButtonKind::Transparent`].
@@ -29,7 +28,8 @@ pub struct Radio<T> {
 
 impl<T> Radio<T> {
     /// Returns a new radio that sets `state` to `value` when pressed. `label`
-    /// is drawn next to the checkbox and is also clickable to select the radio.
+    /// is drawn next to the radio indicator and is also clickable to select the
+    /// radio.
     pub fn new(value: T, state: impl IntoDynamic<T>, label: impl MakeWidget) -> Self {
         Self {
             value,

src/widgets/select.rs

@@ -0,0 +1,91 @@
+//! A selectable, labeled widget representing a value.
+use std::fmt::Debug;
+use std::panic::{RefUnwindSafe, UnwindSafe};
+
+use kludgine::Color;
+
+use crate::styles::components::OutlineColor;
+use crate::styles::{Component, DynamicComponent};
+use crate::value::{Dynamic, IntoDynamic, IntoValue, MapEach, Value};
+use crate::widget::{MakeWidget, WidgetInstance};
+use crate::widgets::button::{ButtonBackground, ButtonHoverBackground, ButtonKind};
+
+/// A selectable, labeled widget representing a value.
+pub struct Select<T> {
+    /// The value this button represents.
+    pub value: T,
+    /// The state (value) of the select.
+    pub state: Dynamic<T>,
+    /// The button kind to use as the basis for this select. Selects default to
+    /// [`ButtonKind::Transparent`].
+    pub kind: Value<ButtonKind>,
+    label: WidgetInstance,
+}
+
+impl<T> Select<T> {
+    /// Returns a new select that sets `state` to `value` when pressed. `label`
+    /// is drawn inside of the button.
+    pub fn new(value: T, state: impl IntoDynamic<T>, label: impl MakeWidget) -> Self {
+        Self {
+            value,
+            state: state.into_dynamic(),
+            kind: Value::Constant(ButtonKind::Transparent),
+            label: label.make_widget(),
+        }
+    }
+
+    /// Updates the button kind to use as the basis for this select, and
+    /// returns self.
+    ///
+    /// Selects default to [`ButtonKind::Transparent`].
+    #[must_use]
+    pub fn kind(mut self, kind: impl IntoValue<ButtonKind>) -> Self {
+        self.kind = kind.into_value();
+        self
+    }
+}
+
+impl<T> MakeWidget for Select<T>
+where
+    T: Clone + Debug + Eq + RefUnwindSafe + UnwindSafe + Send + Sync + 'static,
+{
+    fn make_widget(self) -> WidgetInstance {
+        let selected = self.state.map_each({
+            let value = self.value.clone();
+            move |state| state == &value
+        });
+        let selected_color = DynamicComponent::new({
+            let selected = selected.clone();
+            move |context| {
+                if selected.get_tracking_refresh(context) {
+                    Some(Component::Color(context.get(&SelectedColor)))
+                } else {
+                    None
+                }
+            }
+        });
+        let kind = (&selected, &self.kind.into_dynamic()).map_each(|(selected, default_kind)| {
+            if *selected {
+                ButtonKind::Solid
+            } else {
+                *default_kind
+            }
+        });
+        self.label
+            .into_button()
+            .on_click(move |()| {
+                self.state.set(self.value.clone());
+            })
+            .kind(kind)
+            .with_dynamic(&ButtonBackground, selected_color.clone())
+            .with_dynamic(&ButtonHoverBackground, selected_color)
+            .make_widget()
+    }
+}
+
+define_components! {
+    Select {
+        /// The color of the selected [`Select`] widget.
+        SelectedColor(Color, "color", @OutlineColor)
+    }
+}

src/widgets/stack.rs

@@ -431,9 +431,7 @@ impl Layout {
                 !needs_final_layout,
             ));
             self.layouts[index].size = measured;
-            if measured == 0 {
-                self.other = UPx::ZERO;
-            } else {
+            if measured > 0 {
                 if fit_index < self.fit_to_content.len() - 1
                     || self.fit_to_content.len() != self.children.len()
                 {