Replace stateful widgets with new `iced_pure` API

1 files changed, 283 insertions, 0 deletions

diff --git a/native/src/widget/helpers.rs b/native/src/widget/helpers.rs
new file mode 100644
index 00000000..648aab5f
--- /dev/null
+++ b/native/src/widget/helpers.rs
@@ -0,0 +1,283 @@
+//! Helper functions to create pure widgets.
+use crate::widget;
+use crate::{Element, Length};
+
+use std::borrow::Cow;
+use std::ops::RangeInclusive;
+
+/// Creates a [`Column`] with the given children.
+///
+/// [`Column`]: widget::Column
+#[macro_export]
+macro_rules! column {
+    () => (
+        $crate::widget::Column::new()
+    );
+    ($($x:expr),+ $(,)?) => (
+        $crate::widget::Column::with_children(vec![$($crate::Element::from($x)),+])
+    );
+}
+
+/// Creates a [Row`] with the given children.
+///
+/// [`Row`]: widget::Row
+#[macro_export]
+macro_rules! row {
+    () => (
+        $crate::widget::Row::new()
+    );
+    ($($x:expr),+ $(,)?) => (
+        $crate::widget::Row::with_children(vec![$($crate::Element::from($x)),+])
+    );
+}
+
+/// Creates a new [`Container`] with the provided content.
+///
+/// [`Container`]: widget::Container
+pub fn container<'a, Message, Renderer>(
+    content: impl Into<Element<'a, Message, Renderer>>,
+) -> widget::Container<'a, Message, Renderer>
+where
+    Renderer: crate::Renderer,
+    Renderer::Theme: widget::container::StyleSheet,
+{
+    widget::Container::new(content)
+}
+
+/// Creates a new [`Column`] with the given children.
+///
+/// [`Column`]: widget::Column
+pub fn column<'a, Message, Renderer>(
+    children: Vec<Element<'a, Message, Renderer>>,
+) -> widget::Row<'a, Message, Renderer> {
+    widget::Row::with_children(children)
+}
+
+/// Creates a new [`Row`] with the given children.
+///
+/// [`Row`]: widget::Row
+pub fn row<'a, Message, Renderer>(
+    children: Vec<Element<'a, Message, Renderer>>,
+) -> widget::Row<'a, Message, Renderer> {
+    widget::Row::with_children(children)
+}
+
+/// Creates a new [`Scrollable`] with the provided content.
+///
+/// [`Scrollable`]: widget::Scrollable
+pub fn scrollable<'a, Message, Renderer>(
+    content: impl Into<Element<'a, Message, Renderer>>,
+) -> widget::Scrollable<'a, Message, Renderer>
+where
+    Renderer: crate::Renderer,
+    Renderer::Theme: widget::scrollable::StyleSheet,
+{
+    widget::Scrollable::new(content)
+}
+
+/// Creates a new [`Button`] with the provided content.
+///
+/// [`Button`]: widget::Button
+pub fn button<'a, Message, Renderer>(
+    content: impl Into<Element<'a, Message, Renderer>>,
+) -> widget::Button<'a, Message, Renderer>
+where
+    Renderer: crate::Renderer,
+    Renderer::Theme: widget::button::StyleSheet,
+{
+    widget::Button::new(content)
+}
+
+/// Creates a new [`Tooltip`] with the provided content, tooltip text, and [`tooltip::Position`].
+///
+/// [`Tooltip`]: widget::Tooltip
+/// [`tooltip::Position`]: widget::tooltip::Position
+pub fn tooltip<'a, Message, Renderer>(
+    content: impl Into<Element<'a, Message, Renderer>>,
+    tooltip: impl ToString,
+    position: widget::tooltip::Position,
+) -> widget::Tooltip<'a, Message, Renderer>
+where
+    Renderer: crate::text::Renderer,
+    Renderer::Theme: widget::container::StyleSheet + widget::text::StyleSheet,
+{
+    widget::Tooltip::new(content, tooltip, position)
+}
+
+/// Creates a new [`Text`] widget with the provided content.
+///
+/// [`Text`]: widget::Text
+pub fn text<Renderer>(text: impl Into<String>) -> widget::Text<Renderer>
+where
+    Renderer: crate::text::Renderer,
+    Renderer::Theme: widget::text::StyleSheet,
+{
+    widget::Text::new(text)
+}
+
+/// Creates a new [`Checkbox`].
+///
+/// [`Checkbox`]: widget::Checkbox
+pub fn checkbox<'a, Message, Renderer>(
+    label: impl Into<String>,
+    is_checked: bool,
+    f: impl Fn(bool) -> Message + 'a,
+) -> widget::Checkbox<'a, Message, Renderer>
+where
+    Renderer: crate::text::Renderer,
+    Renderer::Theme: widget::checkbox::StyleSheet + widget::text::StyleSheet,
+{
+    widget::Checkbox::new(is_checked, label, f)
+}
+
+/// Creates a new [`Radio`].
+///
+/// [`Radio`]: widget::Radio
+pub fn radio<Message, Renderer, V>(
+    label: impl Into<String>,
+    value: V,
+    selected: Option<V>,
+    on_click: impl FnOnce(V) -> Message,
+) -> widget::Radio<Message, Renderer>
+where
+    Message: Clone,
+    Renderer: crate::text::Renderer,
+    Renderer::Theme: widget::radio::StyleSheet,
+    V: Copy + Eq,
+{
+    widget::Radio::new(value, label, selected, on_click)
+}
+
+/// Creates a new [`Toggler`].
+///
+/// [`Toggler`]: widget::Toggler
+pub fn toggler<'a, Message, Renderer>(
+    label: impl Into<Option<String>>,
+    is_checked: bool,
+    f: impl Fn(bool) -> Message + 'a,
+) -> widget::Toggler<'a, Message, Renderer>
+where
+    Renderer: crate::text::Renderer,
+    Renderer::Theme: widget::toggler::StyleSheet,
+{
+    widget::Toggler::new(is_checked, label, f)
+}
+
+/// Creates a new [`TextInput`].
+///
+/// [`TextInput`]: widget::TextInput
+pub fn text_input<'a, Message, Renderer>(
+    placeholder: &str,
+    value: &str,
+    on_change: impl Fn(String) -> Message + 'a,
+) -> widget::TextInput<'a, Message, Renderer>
+where
+    Message: Clone,
+    Renderer: crate::text::Renderer,
+    Renderer::Theme: widget::text_input::StyleSheet,
+{
+    widget::TextInput::new(placeholder, value, on_change)
+}
+
+/// Creates a new [`Slider`].
+///
+/// [`Slider`]: widget::Slider
+pub fn slider<'a, T, Message, Renderer>(
+    range: std::ops::RangeInclusive<T>,
+    value: T,
+    on_change: impl Fn(T) -> Message + 'a,
+) -> widget::Slider<'a, T, Message, Renderer>
+where
+    T: Copy + From<u8> + std::cmp::PartialOrd,
+    Message: Clone,
+    Renderer: crate::Renderer,
+    Renderer::Theme: widget::slider::StyleSheet,
+{
+    widget::Slider::new(range, value, on_change)
+}
+
+/// Creates a new [`PickList`].
+///
+/// [`PickList`]: widget::PickList
+pub fn pick_list<'a, Message, Renderer, T>(
+    options: impl Into<Cow<'a, [T]>>,
+    selected: Option<T>,
+    on_selected: impl Fn(T) -> Message + 'a,
+) -> widget::PickList<'a, T, Message, Renderer>
+where
+    T: ToString + Eq + 'static,
+    [T]: ToOwned<Owned = Vec<T>>,
+    Renderer: crate::text::Renderer,
+    Renderer::Theme: widget::pick_list::StyleSheet,
+{
+    widget::PickList::new(options, selected, on_selected)
+}
+
+/// Creates a new [`Image`].
+///
+/// [`Image`]: widget::Image
+pub fn image<Handle>(handle: impl Into<Handle>) -> widget::Image<Handle> {
+    widget::Image::new(handle.into())
+}
+
+/// Creates a new horizontal [`Space`] with the given [`Length`].
+///
+/// [`Space`]: widget::Space
+pub fn horizontal_space(width: Length) -> widget::Space {
+    widget::Space::with_width(width)
+}
+
+/// Creates a new vertical [`Space`] with the given [`Length`].
+///
+/// [`Space`]: widget::Space
+pub fn vertical_space(height: Length) -> widget::Space {
+    widget::Space::with_height(height)
+}
+
+/// Creates a horizontal [`Rule`] with the given height.
+///
+/// [`Rule`]: widget::Rule
+pub fn horizontal_rule<Renderer>(height: u16) -> widget::Rule<Renderer>
+where
+    Renderer: crate::Renderer,
+    Renderer::Theme: widget::rule::StyleSheet,
+{
+    widget::Rule::horizontal(height)
+}
+
+/// Creates a vertical [`Rule`] with the given width.
+///
+/// [`Rule`]: widget::Rule
+pub fn vertical_rule<Renderer>(width: u16) -> widget::Rule<Renderer>
+where
+    Renderer: crate::Renderer,
+    Renderer::Theme: widget::rule::StyleSheet,
+{
+    widget::Rule::vertical(width)
+}
+
+/// Creates a new [`ProgressBar`].
+///
+/// It expects:
+///   * an inclusive range of possible values, and
+///   * the current value of the [`ProgressBar`].
+///
+/// [`ProgressBar`]: widget::ProgressBar
+pub fn progress_bar<Renderer>(
+    range: RangeInclusive<f32>,
+    value: f32,
+) -> widget::ProgressBar<Renderer>
+where
+    Renderer: crate::Renderer,
+    Renderer::Theme: widget::progress_bar::StyleSheet,
+{
+    widget::ProgressBar::new(range, value)
+}
+
+/// Creates a new [`Svg`] widget from the given [`Handle`].
+///
+/// [`Svg`]: widget::Svg
+/// [`Handle`]: widget::svg::Handle
+pub fn svg(handle: impl Into<widget::svg::Handle>) -> widget::Svg {
+    widget::Svg::new(handle)
+}