Start `iced_winit` and `iced_wgpu`

1 files changed, 547 insertions, 165 deletions

diff --git a/examples/tour/src/main.rs b/examples/tour/src/main.rs
index a34d3298..5017041a 100644
--- a/examples/tour/src/main.rs
+++ b/examples/tour/src/main.rs
@@ -1,191 +1,573 @@
-use iced_tour::{iced_ggez, Tour};
-
-use ggez;
-use ggez::event;
-use ggez::filesystem;
-use ggez::graphics;
-use ggez::input::mouse;
-
-pub fn main() -> ggez::GameResult {
-    env_logger::init();
-
-    let (context, event_loop) = {
-        &mut ggez::ContextBuilder::new("iced", "ggez")
-            .window_mode(ggez::conf::WindowMode {
-                width: 1280.0,
-                height: 1024.0,
-                resizable: true,
-                ..ggez::conf::WindowMode::default()
-            })
-            .build()?
-    };
-
-    filesystem::mount(
-        context,
-        std::path::Path::new(env!("CARGO_MANIFEST_DIR")),
-        true,
-    );
-
-    let state = &mut Game::new(context)?;
-
-    event::run(context, event_loop, state)
-}
+use iced::{
+    button, slider, text::HorizontalAlignment, Align, Button, Checkbox, Color,
+    Column, Element, Image, Length, Radio, Row, Slider, Text, UserInterface,
+};
 
-struct Game {
-    spritesheet: graphics::Image,
-    font: graphics::Font,
-    images: iced_ggez::ImageCache,
-    tour: Tour,
+pub fn main() {
+    let tour = Tour::new();
 
-    events: Vec<iced_native::Event>,
-    cache: Option<iced_native::Cache>,
+    tour.run();
 }
 
-impl Game {
-    fn new(context: &mut ggez::Context) -> ggez::GameResult<Game> {
-        graphics::set_default_filter(context, graphics::FilterMode::Nearest);
-
-        Ok(Game {
-            spritesheet: graphics::Image::new(context, "/resources/ui.png")
-                .unwrap(),
-            font: graphics::Font::new(context, "/resources/Roboto-Regular.ttf")
-                .unwrap(),
-            images: iced_ggez::ImageCache::new(),
-            tour: Tour::new(),
+pub struct Tour {
+    steps: Steps,
+    back_button: button::State,
+    next_button: button::State,
+    debug: bool,
+}
 
-            events: Vec::new(),
-            cache: Some(iced_native::Cache::default()),
-        })
+impl Tour {
+    pub fn new() -> Tour {
+        Tour {
+            steps: Steps::new(),
+            back_button: button::State::new(),
+            next_button: button::State::new(),
+            debug: false,
+        }
     }
 }
 
-impl event::EventHandler for Game {
-    fn update(&mut self, _ctx: &mut ggez::Context) -> ggez::GameResult {
-        Ok(())
-    }
-
-    fn mouse_button_down_event(
-        &mut self,
-        _context: &mut ggez::Context,
-        _button: mouse::MouseButton,
-        _x: f32,
-        _y: f32,
-    ) {
-        self.events.push(iced_native::Event::Mouse(
-            iced_native::input::mouse::Event::Input {
-                state: iced_native::input::ButtonState::Pressed,
-                button: iced_native::input::mouse::Button::Left, // TODO: Map `button`
-            },
-        ));
-    }
-
-    fn mouse_button_up_event(
-        &mut self,
-        _context: &mut ggez::Context,
-        _button: mouse::MouseButton,
-        _x: f32,
-        _y: f32,
-    ) {
-        self.events.push(iced_native::Event::Mouse(
-            iced_native::input::mouse::Event::Input {
-                state: iced_native::input::ButtonState::Released,
-                button: iced_native::input::mouse::Button::Left, // TODO: Map `button`
-            },
-        ));
-    }
-
-    fn mouse_motion_event(
-        &mut self,
-        _context: &mut ggez::Context,
-        x: f32,
-        y: f32,
-        _dx: f32,
-        _dy: f32,
-    ) {
-        self.events.push(iced_native::Event::Mouse(
-            iced_native::input::mouse::Event::CursorMoved { x, y },
-        ));
-    }
-
-    fn resize_event(
-        &mut self,
-        context: &mut ggez::Context,
-        width: f32,
-        height: f32,
-    ) {
-        graphics::set_screen_coordinates(
-            context,
-            graphics::Rect {
-                x: 0.0,
-                y: 0.0,
-                w: width,
-                h: height,
-            },
-        )
-        .expect("Set screen coordinates");
-    }
-
-    fn draw(&mut self, context: &mut ggez::Context) -> ggez::GameResult {
-        graphics::clear(context, graphics::WHITE);
-
-        let screen = graphics::screen_coordinates(context);
-
-        let (messages, cursor) = {
-            let view = self.tour.view();
-
-            let content = iced_ggez::Column::new()
-                .width(iced_native::Length::Units(screen.w as u16))
-                .height(iced_native::Length::Units(screen.h as u16))
-                .padding(20)
-                .align_items(iced_native::Align::Center)
-                .justify_content(iced_native::Justify::Center)
-                .push(view);
-
-            let renderer = &mut iced_ggez::Renderer::new(
-                context,
-                &mut self.images,
-                self.spritesheet.clone(),
-                self.font,
+impl UserInterface for Tour {
+    type Message = Message;
+
+    fn update(&mut self, event: Message) {
+        match event {
+            Message::BackPressed => {
+                self.steps.go_back();
+            }
+            Message::NextPressed => {
+                self.steps.advance();
+            }
+            Message::StepMessage(step_msg) => {
+                self.steps.update(step_msg, &mut self.debug);
+            }
+        }
+    }
+
+    fn view(&mut self) -> Element<Message> {
+        let Tour {
+            steps,
+            back_button,
+            next_button,
+            ..
+        } = self;
+
+        let mut controls = Row::new();
+
+        if steps.has_previous() {
+            controls = controls.push(
+                Button::new(back_button, "Back")
+                    .on_press(Message::BackPressed)
+                    .class(button::Class::Secondary),
             );
+        }
+
+        controls = controls.push(Column::new());
 
-            let mut ui = iced_native::UserInterface::build(
-                content,
-                self.cache.take().unwrap(),
-                renderer,
+        if steps.can_continue() {
+            controls = controls.push(
+                Button::new(next_button, "Next").on_press(Message::NextPressed),
             );
+        }
 
-            let messages = ui.update(self.events.drain(..));
-            let cursor = ui.draw(renderer);
+        let element: Element<_> = Column::new()
+            .max_width(Length::Units(500))
+            .spacing(20)
+            .push(steps.view(self.debug).map(Message::StepMessage))
+            .push(controls)
+            .into();
 
-            self.cache = Some(ui.into_cache());
+        if self.debug {
+            element.explain(Color::BLACK)
+        } else {
+            element
+        }
+    }
+}
 
-            renderer.flush();
+#[derive(Debug, Clone, Copy)]
+pub enum Message {
+    BackPressed,
+    NextPressed,
+    StepMessage(StepMessage),
+}
 
-            (messages, cursor)
-        };
+struct Steps {
+    steps: Vec<Step>,
+    current: usize,
+}
 
-        for message in messages {
-            self.tour.update(message);
+impl Steps {
+    fn new() -> Steps {
+        Steps {
+            steps: vec![
+                Step::Welcome,
+                Step::Slider {
+                    state: slider::State::new(),
+                    value: 50,
+                },
+                Step::RowsAndColumns {
+                    layout: Layout::Row,
+                    spacing_slider: slider::State::new(),
+                    spacing: 20,
+                },
+                Step::Text {
+                    size_slider: slider::State::new(),
+                    size: 30,
+                    color_sliders: [slider::State::new(); 3],
+                    color: Color::BLACK,
+                },
+                Step::Radio { selection: None },
+                Step::Image {
+                    width: 300,
+                    slider: slider::State::new(),
+                },
+                Step::Debugger,
+                Step::End,
+            ],
+            current: 0,
         }
+    }
 
-        let cursor_type = into_cursor_type(cursor);
+    fn update(&mut self, msg: StepMessage, debug: &mut bool) {
+        self.steps[self.current].update(msg, debug);
+    }
+
+    fn view(&mut self, debug: bool) -> Element<StepMessage> {
+        self.steps[self.current].view(debug)
+    }
+
+    fn advance(&mut self) {
+        if self.can_continue() {
+            self.current += 1;
+        }
+    }
 
-        if mouse::cursor_type(context) != cursor_type {
-            mouse::set_cursor_type(context, cursor_type);
+    fn go_back(&mut self) {
+        if self.has_previous() {
+            self.current -= 1;
         }
+    }
 
-        graphics::present(context)?;
-        Ok(())
+    fn has_previous(&self) -> bool {
+        self.current > 0
     }
+
+    fn can_continue(&self) -> bool {
+        self.current + 1 < self.steps.len()
+            && self.steps[self.current].can_continue()
+    }
+}
+
+enum Step {
+    Welcome,
+    Slider {
+        state: slider::State,
+        value: u16,
+    },
+    RowsAndColumns {
+        layout: Layout,
+        spacing_slider: slider::State,
+        spacing: u16,
+    },
+    Text {
+        size_slider: slider::State,
+        size: u16,
+        color_sliders: [slider::State; 3],
+        color: Color,
+    },
+    Radio {
+        selection: Option<Language>,
+    },
+    Image {
+        width: u16,
+        slider: slider::State,
+    },
+    Debugger,
+    End,
+}
+
+#[derive(Debug, Clone, Copy)]
+pub enum StepMessage {
+    SliderChanged(f32),
+    LayoutChanged(Layout),
+    SpacingChanged(f32),
+    TextSizeChanged(f32),
+    TextColorChanged(Color),
+    LanguageSelected(Language),
+    ImageWidthChanged(f32),
+    DebugToggled(bool),
 }
 
-fn into_cursor_type(cursor: iced_native::MouseCursor) -> mouse::MouseCursor {
-    match cursor {
-        iced_native::MouseCursor::OutOfBounds => mouse::MouseCursor::Default,
-        iced_native::MouseCursor::Idle => mouse::MouseCursor::Default,
-        iced_native::MouseCursor::Pointer => mouse::MouseCursor::Hand,
-        iced_native::MouseCursor::Working => mouse::MouseCursor::Progress,
-        iced_native::MouseCursor::Grab => mouse::MouseCursor::Grab,
-        iced_native::MouseCursor::Grabbing => mouse::MouseCursor::Grabbing,
+impl<'a> Step {
+    fn update(&mut self, msg: StepMessage, debug: &mut bool) {
+        match msg {
+            StepMessage::DebugToggled(value) => {
+                if let Step::Debugger = self {
+                    *debug = value;
+                }
+            }
+            StepMessage::LanguageSelected(language) => {
+                if let Step::Radio { selection } = self {
+                    *selection = Some(language);
+                }
+            }
+            StepMessage::SliderChanged(new_value) => {
+                if let Step::Slider { value, .. } = self {
+                    *value = new_value.round() as u16;
+                }
+            }
+            StepMessage::TextSizeChanged(new_size) => {
+                if let Step::Text { size, .. } = self {
+                    *size = new_size.round() as u16;
+                }
+            }
+            StepMessage::TextColorChanged(new_color) => {
+                if let Step::Text { color, .. } = self {
+                    *color = new_color;
+                }
+            }
+            StepMessage::LayoutChanged(new_layout) => {
+                if let Step::RowsAndColumns { layout, .. } = self {
+                    *layout = new_layout;
+                }
+            }
+            StepMessage::SpacingChanged(new_spacing) => {
+                if let Step::RowsAndColumns { spacing, .. } = self {
+                    *spacing = new_spacing.round() as u16;
+                }
+            }
+            StepMessage::ImageWidthChanged(new_width) => {
+                if let Step::Image { width, .. } = self {
+                    *width = new_width.round() as u16;
+                }
+            }
+        };
+    }
+
+    fn can_continue(&self) -> bool {
+        match self {
+            Step::Welcome => true,
+            Step::Radio { selection } => *selection == Some(Language::Rust),
+            Step::Slider { .. } => true,
+            Step::Text { .. } => true,
+            Step::Image { .. } => true,
+            Step::RowsAndColumns { .. } => true,
+            Step::Debugger => true,
+            Step::End => false,
+        }
+    }
+
+    fn view(&mut self, debug: bool) -> Element<StepMessage> {
+        match self {
+            Step::Welcome => Self::welcome().into(),
+            Step::Radio { selection } => Self::radio(*selection).into(),
+            Step::Slider { state, value } => Self::slider(state, *value).into(),
+            Step::Text {
+                size_slider,
+                size,
+                color_sliders,
+                color,
+            } => Self::text(size_slider, *size, color_sliders, *color).into(),
+            Step::Image { width, slider } => Self::image(*width, slider).into(),
+            Step::RowsAndColumns {
+                layout,
+                spacing_slider,
+                spacing,
+            } => {
+                Self::rows_and_columns(*layout, spacing_slider, *spacing).into()
+            }
+            Step::Debugger => Self::debugger(debug).into(),
+            Step::End => Self::end().into(),
+        }
     }
+
+    fn container(title: &str) -> Column<'a, StepMessage> {
+        Column::new()
+            .spacing(20)
+            .align_items(Align::Stretch)
+            .push(Text::new(title).size(50))
+    }
+
+    fn welcome() -> Column<'a, StepMessage> {
+        Self::container("Welcome!")
+            .push(Text::new(
+                "This a simple tour meant to showcase a bunch of widgets that \
+                 can be easily implemented on top of Iced.",
+            ))
+            .push(Text::new(
+                "Iced is a renderer-agnostic GUI library for Rust focused on \
+                 simplicity and type-safety. It is heavily inspired by Elm.",
+            ))
+            .push(Text::new(
+                "It was originally born as part of Coffee, an opinionated \
+                 2D game engine for Rust.",
+            ))
+            .push(Text::new(
+                "Iced does not provide a built-in renderer. This example runs \
+                 on WebAssembly using dodrio, an experimental VDOM library \
+                 for Rust.",
+            ))
+            .push(Text::new(
+                "You will need to interact with the UI in order to reach the \
+                 end!",
+            ))
+    }
+
+    fn slider(
+        state: &'a mut slider::State,
+        value: u16,
+    ) -> Column<'a, StepMessage> {
+        Self::container("Slider")
+            .push(Text::new(
+                "A slider allows you to smoothly select a value from a range \
+                 of values.",
+            ))
+            .push(Text::new(
+                "The following slider lets you choose an integer from \
+                 0 to 100:",
+            ))
+            .push(Slider::new(
+                state,
+                0.0..=100.0,
+                value as f32,
+                StepMessage::SliderChanged,
+            ))
+            .push(
+                Text::new(&value.to_string())
+                    .horizontal_alignment(HorizontalAlignment::Center),
+            )
+    }
+
+    fn rows_and_columns(
+        layout: Layout,
+        spacing_slider: &'a mut slider::State,
+        spacing: u16,
+    ) -> Column<'a, StepMessage> {
+        let row_radio = Radio::new(
+            Layout::Row,
+            "Row",
+            Some(layout),
+            StepMessage::LayoutChanged,
+        );
+
+        let column_radio = Radio::new(
+            Layout::Column,
+            "Column",
+            Some(layout),
+            StepMessage::LayoutChanged,
+        );
+
+        let layout_section: Element<_> = match layout {
+            Layout::Row => Row::new()
+                .spacing(spacing)
+                .push(row_radio)
+                .push(column_radio)
+                .into(),
+            Layout::Column => Column::new()
+                .spacing(spacing)
+                .push(row_radio)
+                .push(column_radio)
+                .into(),
+        };
+
+        let spacing_section = Column::new()
+            .spacing(10)
+            .push(Slider::new(
+                spacing_slider,
+                0.0..=80.0,
+                spacing as f32,
+                StepMessage::SpacingChanged,
+            ))
+            .push(
+                Text::new(&format!("{} px", spacing))
+                    .horizontal_alignment(HorizontalAlignment::Center),
+            );
+
+        Self::container("Rows and columns")
+            .spacing(spacing)
+            .push(Text::new(
+                "Iced uses a layout model based on flexbox to position UI \
+                 elements.",
+            ))
+            .push(Text::new(
+                "Rows and columns can be used to distribute content \
+                 horizontally or vertically, respectively.",
+            ))
+            .push(layout_section)
+            .push(Text::new(
+                "You can also easily change the spacing between elements:",
+            ))
+            .push(spacing_section)
+    }
+
+    fn text(
+        size_slider: &'a mut slider::State,
+        size: u16,
+        color_sliders: &'a mut [slider::State; 3],
+        color: Color,
+    ) -> Column<'a, StepMessage> {
+        let size_section = Column::new()
+            .padding(20)
+            .spacing(20)
+            .push(Text::new("You can change its size:"))
+            .push(
+                Text::new(&format!("This text is {} pixels", size)).size(size),
+            )
+            .push(Slider::new(
+                size_slider,
+                10.0..=70.0,
+                size as f32,
+                StepMessage::TextSizeChanged,
+            ));
+
+        let [red, green, blue] = color_sliders;
+        let color_section = Column::new()
+            .padding(20)
+            .spacing(20)
+            .push(Text::new("And its color:"))
+            .push(Text::new(&format!("{:?}", color)).color(color))
+            .push(
+                Row::new()
+                    .spacing(10)
+                    .push(Slider::new(red, 0.0..=1.0, color.r, move |r| {
+                        StepMessage::TextColorChanged(Color { r, ..color })
+                    }))
+                    .push(Slider::new(green, 0.0..=1.0, color.g, move |g| {
+                        StepMessage::TextColorChanged(Color { g, ..color })
+                    }))
+                    .push(Slider::new(blue, 0.0..=1.0, color.b, move |b| {
+                        StepMessage::TextColorChanged(Color { b, ..color })
+                    })),
+            );
+
+        Self::container("Text")
+            .push(Text::new(
+                "Text is probably the most essential widget for your UI. \
+                 It will try to adapt to the dimensions of its container.",
+            ))
+            .push(size_section)
+            .push(color_section)
+    }
+
+    fn radio(selection: Option<Language>) -> Column<'a, StepMessage> {
+        let question = Column::new()
+            .padding(20)
+            .spacing(10)
+            .push(Text::new("Iced is written in...").size(24))
+            .push(Language::all().iter().cloned().fold(
+                Column::new().padding(10).spacing(20),
+                |choices, language| {
+                    choices.push(Radio::new(
+                        language,
+                        language.into(),
+                        selection,
+                        StepMessage::LanguageSelected,
+                    ))
+                },
+            ));
+
+        Self::container("Radio button")
+            .push(Text::new(
+                "A radio button is normally used to represent a choice... \
+                 Surprise test!",
+            ))
+            .push(question)
+            .push(Text::new(
+                "Iced works very well with iterators! The list above is \
+                 basically created by folding a column over the different \
+                 choices, creating a radio button for each one of them!",
+            ))
+    }
+
+    fn 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("resources/ferris.png")
+                    .width(Length::Units(width))
+                    .align_self(Align::Center),
+            )
+            .push(Slider::new(
+                slider,
+                100.0..=500.0,
+                width as f32,
+                StepMessage::ImageWidthChanged,
+            ))
+            .push(
+                Text::new(&format!("Width: {} px", width.to_string()))
+                    .horizontal_alignment(HorizontalAlignment::Center),
+            )
+    }
+
+    fn debugger(debug: bool) -> Column<'a, StepMessage> {
+        Self::container("Debugger")
+            .push(Text::new(
+                "You can ask Iced to visually explain the layouting of the \
+                 different elements comprising your UI!",
+            ))
+            .push(Text::new(
+                "Give it a shot! Check the following checkbox to be able to \
+                 see element boundaries.",
+            ))
+            .push(Checkbox::new(
+                debug,
+                "Explain layout",
+                StepMessage::DebugToggled,
+            ))
+            .push(Text::new("Feel free to go back and take a look."))
+    }
+
+    fn end() -> Column<'a, StepMessage> {
+        Self::container("You reached the end!")
+            .push(Text::new(
+                "This tour will be updated as more features are added.",
+            ))
+            .push(Text::new("Make sure to keep an eye on it!"))
+    }
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum Language {
+    Rust,
+    Elm,
+    Ruby,
+    Haskell,
+    C,
+    Other,
+}
+
+impl Language {
+    fn all() -> [Language; 6] {
+        [
+            Language::C,
+            Language::Elm,
+            Language::Ruby,
+            Language::Haskell,
+            Language::Rust,
+            Language::Other,
+        ]
+    }
+}
+
+impl From<Language> for &str {
+    fn from(language: Language) -> &'static str {
+        match language {
+            Language::Rust => "Rust",
+            Language::Elm => "Elm",
+            Language::Ruby => "Ruby",
+            Language::Haskell => "Haskell",
+            Language::C => "C",
+            Language::Other => "Other",
+        }
+    }
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum Layout {
+    Row,
+    Column,
 }