Draft web runtime and widgets

16 files changed, 321 insertions, 29 deletions

diff --git a/web/Cargo.toml b/web/Cargo.toml
index acc5f18b..6d8c37b1 100644
--- a/web/Cargo.toml
+++ b/web/Cargo.toml
@@ -17,6 +17,7 @@ maintenance = { status = "actively-developed" }
 [dependencies]
 iced = { version = "0.1.0-alpha", path = ".." }
 dodrio = "0.1.0"
+futures = "0.1"
 
 [dependencies.web-sys]
 version = "0.3.27"
diff --git a/web/examples/tour/Cargo.toml b/web/examples/tour/Cargo.toml
index 15f38fa7..c2db46ec 100644
--- a/web/examples/tour/Cargo.toml
+++ b/web/examples/tour/Cargo.toml
@@ -11,6 +11,7 @@ crate-type = ["cdylib"]
 [dependencies]
 iced_web = { path = "../.." }
 wasm-bindgen = "0.2.50"
+futures = "0.1"
 log = "0.4"
 console_error_panic_hook = "0.1.6"
 console_log = "0.1.2"
diff --git a/web/examples/tour/src/lib.rs b/web/examples/tour/src/lib.rs
index e747a193..30855e8b 100644
--- a/web/examples/tour/src/lib.rs
+++ b/web/examples/tour/src/lib.rs
@@ -1,8 +1,35 @@
+use futures::{future, Future};
+use iced_web::UserInterface;
 use wasm_bindgen::prelude::*;
 
+mod tour;
+
+use tour::Tour;
+
 #[wasm_bindgen(start)]
 pub fn run() {
     console_error_panic_hook::set_once();
     console_log::init_with_level(log::Level::Trace)
         .expect("Initialize logging");
+
+    let tour = Tour::new();
+
+    tour.run();
+}
+
+impl iced_web::UserInterface for Tour {
+    type Message = tour::Message;
+
+    fn update(
+        &mut self,
+        message: tour::Message,
+    ) -> Box<dyn Future<Item = tour::Message, Error = ()>> {
+        self.update(message);
+
+        Box::new(future::err(()))
+    }
+
+    fn view(&mut self) -> iced_web::Element<tour::Message> {
+        self.view()
+    }
 }
diff --git a/web/examples/tour/src/tour.rs b/web/examples/tour/src/tour.rs
index d0be99b0..6c24622e 100644
--- a/web/examples/tour/src/tour.rs
+++ b/web/examples/tour/src/tour.rs
@@ -1,12 +1,8 @@
-use super::widget::{
-    button, slider, Button, Checkbox, Column, Element, Image, Radio, Row,
-    Slider, Text,
+use iced_web::{
+    button, slider, text::HorizontalAlignment, Align, Button, Checkbox, Color,
+    Column, Element, Image, Radio, Row, Slider, Text,
 };
 
-use ggez::graphics::{self, Color, FilterMode, BLACK};
-use ggez::Context;
-use iced::{text::HorizontalAlignment, Align};
-
 pub struct Tour {
     steps: Steps,
     back_button: button::State,
@@ -15,9 +11,9 @@ pub struct Tour {
 }
 
 impl Tour {
-    pub fn new(context: &mut Context) -> Tour {
+    pub fn new() -> Tour {
         Tour {
-            steps: Steps::new(context),
+            steps: Steps::new(),
             back_button: button::State::new(),
             next_button: button::State::new(),
             debug: false,
@@ -72,7 +68,7 @@ impl Tour {
             .into();
 
         if self.debug {
-            element.explain(BLACK)
+            element.explain(Color::BLACK)
         } else {
             element
         }
@@ -92,7 +88,7 @@ struct Steps {
 }
 
 impl Steps {
-    fn new(context: &mut Context) -> Steps {
+    fn new() -> Steps {
         Steps {
             steps: vec![
                 Step::Welcome,
@@ -109,19 +105,10 @@ impl Steps {
                     size_slider: slider::State::new(),
                     size: 30,
                     color_sliders: [slider::State::new(); 3],
-                    color: BLACK,
+                    color: Color::BLACK,
                 },
                 Step::Radio { selection: None },
                 Step::Image {
-                    ferris: {
-                        let mut image =
-                            graphics::Image::new(context, "/ferris.png")
-                                .expect("Load ferris image");
-
-                        image.set_filter(FilterMode::Linear);
-
-                        image
-                    },
                     width: 300,
                     slider: slider::State::new(),
                 },
@@ -183,7 +170,6 @@ enum Step {
         selection: Option<Language>,
     },
     Image {
-        ferris: graphics::Image,
         width: u16,
         slider: slider::State,
     },
@@ -273,11 +259,7 @@ impl<'a> Step {
                 color_sliders,
                 color,
             } => Self::text(size_slider, *size, color_sliders, *color).into(),
-            Step::Image {
-                ferris,
-                width,
-                slider,
-            } => Self::image(ferris.clone(), *width, slider).into(),
+            Step::Image { width, slider } => Self::image(*width, slider).into(),
             Step::RowsAndColumns {
                 layout,
                 spacing_slider,
@@ -489,13 +471,16 @@ impl<'a> Step {
     }
 
     fn image(
-        ferris: graphics::Image,
         width: u16,
         slider: &'a mut slider::State,
     ) -> Column<'a, StepMessage> {
         Self::container("Image")
             .push(Text::new("An image that tries to keep its aspect ratio."))
-            .push(Image::new(ferris).width(width).align_self(Align::Center))
+            .push(
+                Image::new("resources/ferris.png")
+                    .width(width)
+                    .align_self(Align::Center),
+            )
             .push(Slider::new(
                 slider,
                 100.0..=500.0,
diff --git a/web/src/color.rs b/web/src/color.rs
new file mode 100644
index 00000000..2624c3c9
--- /dev/null
+++ b/web/src/color.rs
@@ -0,0 +1,16 @@
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub struct Color {
+    pub r: f32,
+    pub g: f32,
+    pub b: f32,
+    pub a: f32,
+}
+
+impl Color {
+    pub const BLACK: Color = Color {
+        r: 0.0,
+        g: 0.0,
+        b: 0.0,
+        a: 1.0,
+    };
+}
diff --git a/web/src/element.rs b/web/src/element.rs
new file mode 100644
index 00000000..c0c9ce5d
--- /dev/null
+++ b/web/src/element.rs
@@ -0,0 +1,47 @@
+use crate::{Color, Widget};
+
+pub struct Element<'a, Message> {
+    pub(crate) widget: Box<dyn Widget<Message> + 'a>,
+}
+
+impl<'a, Message> Element<'a, Message> {
+    pub fn new(widget: impl Widget<Message> + 'a) -> Self {
+        Self {
+            widget: Box::new(widget),
+        }
+    }
+
+    pub fn explain(self, color: Color) -> Element<'a, Message> {
+        self
+    }
+
+    pub fn map<F, B>(self, f: F) -> Element<'a, B>
+    where
+        Message: 'static,
+        B: 'static,
+        F: 'static + Fn(Message) -> B,
+    {
+        Element {
+            widget: Box::new(Map::new(self.widget, f)),
+        }
+    }
+}
+
+struct Map<'a, A, B> {
+    widget: Box<dyn Widget<A> + 'a>,
+    mapper: Box<dyn Fn(A) -> B>,
+}
+
+impl<'a, A, B> Map<'a, A, B> {
+    pub fn new<F>(widget: Box<dyn Widget<A> + 'a>, mapper: F) -> Map<'a, A, B>
+    where
+        F: 'static + Fn(A) -> B,
+    {
+        Map {
+            widget,
+            mapper: Box::new(mapper),
+        }
+    }
+}
+
+impl<'a, A, B> Widget<B> for Map<'a, A, B> {}
diff --git a/web/src/lib.rs b/web/src/lib.rs
index 8b137891..187e8ad9 100644
--- a/web/src/lib.rs
+++ b/web/src/lib.rs
@@ -1 +1,28 @@
+use futures::Future;
 
+mod color;
+mod element;
+mod widget;
+
+pub use color::Color;
+pub use element::Element;
+pub use iced::Align;
+pub use widget::*;
+
+pub trait UserInterface {
+    type Message;
+
+    fn update(
+        &mut self,
+        message: Self::Message,
+    ) -> Box<dyn Future<Item = Self::Message, Error = ()>>;
+
+    fn view(&mut self) -> Element<Self::Message>;
+
+    fn run(mut self)
+    where
+        Self: Sized,
+    {
+        let element = self.view();
+    }
+}
diff --git a/web/src/widget.rs b/web/src/widget.rs
new file mode 100644
index 00000000..5cb89a60
--- /dev/null
+++ b/web/src/widget.rs
@@ -0,0 +1,20 @@
+pub mod button;
+pub mod slider;
+pub mod text;
+
+mod checkbox;
+mod column;
+mod image;
+mod radio;
+mod row;
+
+pub use button::Button;
+pub use checkbox::Checkbox;
+pub use column::Column;
+pub use image::Image;
+pub use radio::Radio;
+pub use row::Row;
+pub use slider::Slider;
+pub use text::Text;
+
+pub trait Widget<Message> {}
diff --git a/web/src/widget/button.rs b/web/src/widget/button.rs
new file mode 100644
index 00000000..1f117d82
--- /dev/null
+++ b/web/src/widget/button.rs
@@ -0,0 +1,16 @@
+use crate::{Element, Widget};
+
+pub use iced::button::{Class, State};
+
+pub type Button<'a, Message> = iced::Button<'a, Message>;
+
+impl<'a, Message> Widget<Message> for Button<'a, Message> {}
+
+impl<'a, Message> From<Button<'a, Message>> for Element<'a, Message>
+where
+    Message: 'static,
+{
+    fn from(button: Button<'a, Message>) -> Element<'a, Message> {
+        Element::new(button)
+    }
+}
diff --git a/web/src/widget/checkbox.rs b/web/src/widget/checkbox.rs
new file mode 100644
index 00000000..a231d801
--- /dev/null
+++ b/web/src/widget/checkbox.rs
@@ -0,0 +1,14 @@
+use crate::{Color, Element, Widget};
+
+pub type Checkbox<Message> = iced::Checkbox<Color, Message>;
+
+impl<Message> Widget<Message> for Checkbox<Message> {}
+
+impl<'a, Message> From<Checkbox<Message>> for Element<'a, Message>
+where
+    Message: 'static,
+{
+    fn from(checkbox: Checkbox<Message>) -> Element<'a, Message> {
+        Element::new(checkbox)
+    }
+}
diff --git a/web/src/widget/column.rs b/web/src/widget/column.rs
new file mode 100644
index 00000000..84068ce6
--- /dev/null
+++ b/web/src/widget/column.rs
@@ -0,0 +1,48 @@
+use crate::{Align, Element, Widget};
+
+pub struct Column<'a, Message> {
+    children: Vec<Element<'a, Message>>,
+}
+
+impl<'a, Message> Column<'a, Message> {
+    pub fn new() -> Self {
+        Self {
+            children: Vec::new(),
+        }
+    }
+
+    pub fn spacing(self, _spacing: u16) -> Self {
+        self
+    }
+
+    pub fn padding(self, _padding: u16) -> Self {
+        self
+    }
+
+    pub fn max_width(self, _max_width: u16) -> Self {
+        self
+    }
+
+    pub fn align_items(self, _align: Align) -> Self {
+        self
+    }
+
+    pub fn push<E>(mut self, element: E) -> Self
+    where
+        E: Into<Element<'a, Message>>,
+    {
+        self.children.push(element.into());
+        self
+    }
+}
+
+impl<'a, Message> Widget<Message> for Column<'a, Message> {}
+
+impl<'a, Message> From<Column<'a, Message>> for Element<'a, Message>
+where
+    Message: 'static,
+{
+    fn from(column: Column<'a, Message>) -> Element<'a, Message> {
+        Element::new(column)
+    }
+}
diff --git a/web/src/widget/image.rs b/web/src/widget/image.rs
new file mode 100644
index 00000000..ac144fd8
--- /dev/null
+++ b/web/src/widget/image.rs
@@ -0,0 +1,11 @@
+use crate::{Element, Widget};
+
+pub type Image<'a> = iced::Image<&'a str>;
+
+impl<'a, Message> Widget<Message> for Image<'a> {}
+
+impl<'a, Message> From<Image<'a>> for Element<'a, Message> {
+    fn from(image: Image<'a>) -> Element<'a, Message> {
+        Element::new(image)
+    }
+}
diff --git a/web/src/widget/radio.rs b/web/src/widget/radio.rs
new file mode 100644
index 00000000..0c28b46f
--- /dev/null
+++ b/web/src/widget/radio.rs
@@ -0,0 +1,14 @@
+use crate::{Color, Element, Widget};
+
+pub type Radio<Message> = iced::Radio<Color, Message>;
+
+impl<Message> Widget<Message> for Radio<Message> {}
+
+impl<'a, Message> From<Radio<Message>> for Element<'a, Message>
+where
+    Message: 'static,
+{
+    fn from(radio: Radio<Message>) -> Element<'a, Message> {
+        Element::new(radio)
+    }
+}
diff --git a/web/src/widget/row.rs b/web/src/widget/row.rs
new file mode 100644
index 00000000..fc474ec3
--- /dev/null
+++ b/web/src/widget/row.rs
@@ -0,0 +1,36 @@
+use crate::{Element, Widget};
+
+pub struct Row<'a, Message> {
+    children: Vec<Element<'a, Message>>,
+}
+
+impl<'a, Message> Row<'a, Message> {
+    pub fn new() -> Self {
+        Self {
+            children: Vec::new(),
+        }
+    }
+
+    pub fn spacing(self, _spacing: u16) -> Self {
+        self
+    }
+
+    pub fn push<E>(mut self, element: E) -> Self
+    where
+        E: Into<Element<'a, Message>>,
+    {
+        self.children.push(element.into());
+        self
+    }
+}
+
+impl<'a, Message> Widget<Message> for Row<'a, Message> {}
+
+impl<'a, Message> From<Row<'a, Message>> for Element<'a, Message>
+where
+    Message: 'static,
+{
+    fn from(column: Row<'a, Message>) -> Element<'a, Message> {
+        Element::new(column)
+    }
+}
diff --git a/web/src/widget/slider.rs b/web/src/widget/slider.rs
new file mode 100644
index 00000000..9c83befb
--- /dev/null
+++ b/web/src/widget/slider.rs
@@ -0,0 +1,16 @@
+use crate::{Element, Widget};
+
+pub use iced::slider::State;
+
+pub type Slider<'a, Message> = iced::Slider<'a, Message>;
+
+impl<'a, Message> Widget<Message> for Slider<'a, Message> {}
+
+impl<'a, Message> From<Slider<'a, Message>> for Element<'a, Message>
+where
+    Message: 'static,
+{
+    fn from(slider: Slider<'a, Message>) -> Element<'a, Message> {
+        Element::new(slider)
+    }
+}
diff --git a/web/src/widget/text.rs b/web/src/widget/text.rs
new file mode 100644
index 00000000..0c1f75b6
--- /dev/null
+++ b/web/src/widget/text.rs
@@ -0,0 +1,13 @@
+use crate::{Color, Element, Widget};
+
+pub use iced::text::HorizontalAlignment;
+
+pub type Text = iced::Text<Color>;
+
+impl<'a, Message> Widget<Message> for Text {}
+
+impl<'a, Message> From<Text> for Element<'a, Message> {
+    fn from(text: Text) -> Element<'a, Message> {
+        Element::new(text)
+    }
+}