duplicate `pane_grid` example to `multi_window`

2 files changed, 355 insertions, 27 deletions

diff --git a/examples/multi_window/Cargo.toml b/examples/multi_window/Cargo.toml
new file mode 100644
index 00000000..9c3d0f21
--- /dev/null
+++ b/examples/multi_window/Cargo.toml
@@ -0,0 +1,12 @@
+[package]
+name = "multi_window"
+version = "0.1.0"
+authors = ["Richard Custodio <richardsoncusto@gmail.com>"]
+edition = "2021"
+publish = false
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+iced = { path = "../..", features = ["debug", "multi_window"] }
+iced_native = { path = "../../native" }
+iced_lazy = { path = "../../lazy" }
\ No newline at end of file
diff --git a/examples/multi_window/src/main.rs b/examples/multi_window/src/main.rs
index 0ba6a591..ae8fa22b 100644
--- a/examples/multi_window/src/main.rs
+++ b/examples/multi_window/src/main.rs
@@ -1,58 +1,374 @@
-use iced::multi_window::Application;
-use iced::pure::{button, column, text, Element};
-use iced::{window, Alignment, Command, Settings};
+use iced::alignment::{self, Alignment};
+use iced::executor;
+use iced::keyboard;
+use iced::theme::{self, Theme};
+use iced::widget::pane_grid::{self, PaneGrid};
+use iced::widget::{button, column, container, row, scrollable, text};
+use iced::{
+    Application, Color, Command, Element, Length, Settings, Size, Subscription,
+};
+use iced_lazy::responsive;
+use iced_native::{event, subscription, Event};
 
 pub fn main() -> iced::Result {
-    Counter::run(Settings::default())
+    Example::run(Settings::default())
 }
 
-struct Counter {
-    value: i32,
+struct Example {
+    panes: pane_grid::State<Pane>,
+    panes_created: usize,
+    focus: Option<pane_grid::Pane>,
 }
 
 #[derive(Debug, Clone, Copy)]
 enum Message {
-    IncrementPressed,
-    DecrementPressed,
+    Split(pane_grid::Axis, pane_grid::Pane),
+    SplitFocused(pane_grid::Axis),
+    FocusAdjacent(pane_grid::Direction),
+    Clicked(pane_grid::Pane),
+    Dragged(pane_grid::DragEvent),
+    Resized(pane_grid::ResizeEvent),
+    TogglePin(pane_grid::Pane),
+    Close(pane_grid::Pane),
+    CloseFocused,
 }
 
-impl Application for Counter {
-    type Flags = ();
-    type Executor = iced::executor::Default;
+impl Application for Example {
     type Message = Message;
+    type Theme = Theme;
+    type Executor = executor::Default;
+    type Flags = ();
 
     fn new(_flags: ()) -> (Self, Command<Message>) {
-        (Self { value: 0 }, Command::none())
-    }
+        let (panes, _) = pane_grid::State::new(Pane::new(0));
 
-    fn title(&self) -> String {
-        String::from("MultiWindow - Iced")
+        (
+            Example {
+                panes,
+                panes_created: 1,
+                focus: None,
+            },
+            Command::none(),
+        )
     }
 
-    fn windows(&self) -> Vec<(window::Id, iced::window::Settings)> {
-        todo!()
+    fn title(&self) -> String {
+        String::from("Pane grid - Iced")
     }
 
     fn update(&mut self, message: Message) -> Command<Message> {
         match message {
-            Message::IncrementPressed => {
-                self.value += 1;
+            Message::Split(axis, pane) => {
+                let result = self.panes.split(
+                    axis,
+                    &pane,
+                    Pane::new(self.panes_created),
+                );
+
+                if let Some((pane, _)) = result {
+                    self.focus = Some(pane);
+                }
+
+                self.panes_created += 1;
+            }
+            Message::SplitFocused(axis) => {
+                if let Some(pane) = self.focus {
+                    let result = self.panes.split(
+                        axis,
+                        &pane,
+                        Pane::new(self.panes_created),
+                    );
+
+                    if let Some((pane, _)) = result {
+                        self.focus = Some(pane);
+                    }
+
+                    self.panes_created += 1;
+                }
+            }
+            Message::FocusAdjacent(direction) => {
+                if let Some(pane) = self.focus {
+                    if let Some(adjacent) =
+                        self.panes.adjacent(&pane, direction)
+                    {
+                        self.focus = Some(adjacent);
+                    }
+                }
+            }
+            Message::Clicked(pane) => {
+                self.focus = Some(pane);
+            }
+            Message::Resized(pane_grid::ResizeEvent { split, ratio }) => {
+                self.panes.resize(&split, ratio);
+            }
+            Message::Dragged(pane_grid::DragEvent::Dropped {
+                pane,
+                target,
+            }) => {
+                self.panes.swap(&pane, &target);
             }
-            Message::DecrementPressed => {
-                self.value -= 1;
+            Message::Dragged(_) => {}
+            Message::TogglePin(pane) => {
+                if let Some(Pane { is_pinned, .. }) = self.panes.get_mut(&pane)
+                {
+                    *is_pinned = !*is_pinned;
+                }
+            }
+            Message::Close(pane) => {
+                if let Some((_, sibling)) = self.panes.close(&pane) {
+                    self.focus = Some(sibling);
+                }
+            }
+            Message::CloseFocused => {
+                if let Some(pane) = self.focus {
+                    if let Some(Pane { is_pinned, .. }) = self.panes.get(&pane)
+                    {
+                        if !is_pinned {
+                            if let Some((_, sibling)) = self.panes.close(&pane)
+                            {
+                                self.focus = Some(sibling);
+                            }
+                        }
+                    }
+                }
             }
         }
 
         Command::none()
     }
 
+    fn subscription(&self) -> Subscription<Message> {
+        subscription::events_with(|event, status| {
+            if let event::Status::Captured = status {
+                return None;
+            }
+
+            match event {
+                Event::Keyboard(keyboard::Event::KeyPressed {
+                    modifiers,
+                    key_code,
+                }) if modifiers.command() => handle_hotkey(key_code),
+                _ => None,
+            }
+        })
+    }
+
     fn view(&self) -> Element<Message> {
-        column()
-            .padding(20)
-            .align_items(Alignment::Center)
-            .push(button("Increment").on_press(Message::IncrementPressed))
-            .push(text(self.value.to_string()).size(50))
-            .push(button("Decrement").on_press(Message::DecrementPressed))
+        let focus = self.focus;
+        let total_panes = self.panes.len();
+
+        let pane_grid = PaneGrid::new(&self.panes, |id, pane| {
+            let is_focused = focus == Some(id);
+
+            let pin_button = button(
+                text(if pane.is_pinned { "Unpin" } else { "Pin" }).size(14),
+            )
+            .on_press(Message::TogglePin(id))
+            .padding(3);
+
+            let title = row![
+                pin_button,
+                "Pane",
+                text(pane.id.to_string()).style(if is_focused {
+                    PANE_ID_COLOR_FOCUSED
+                } else {
+                    PANE_ID_COLOR_UNFOCUSED
+                }),
+            ]
+            .spacing(5);
+
+            let title_bar = pane_grid::TitleBar::new(title)
+                .controls(view_controls(id, total_panes, pane.is_pinned))
+                .padding(10)
+                .style(if is_focused {
+                    style::title_bar_focused
+                } else {
+                    style::title_bar_active
+                });
+
+            pane_grid::Content::new(responsive(move |size| {
+                view_content(id, total_panes, pane.is_pinned, size)
+            }))
+            .title_bar(title_bar)
+            .style(if is_focused {
+                style::pane_focused
+            } else {
+                style::pane_active
+            })
+        })
+        .width(Length::Fill)
+        .height(Length::Fill)
+        .spacing(10)
+        .on_click(Message::Clicked)
+        .on_drag(Message::Dragged)
+        .on_resize(10, Message::Resized);
+
+        container(pane_grid)
+            .width(Length::Fill)
+            .height(Length::Fill)
+            .padding(10)
             .into()
     }
 }
+
+const PANE_ID_COLOR_UNFOCUSED: Color = Color::from_rgb(
+    0xFF as f32 / 255.0,
+    0xC7 as f32 / 255.0,
+    0xC7 as f32 / 255.0,
+);
+const PANE_ID_COLOR_FOCUSED: Color = Color::from_rgb(
+    0xFF as f32 / 255.0,
+    0x47 as f32 / 255.0,
+    0x47 as f32 / 255.0,
+);
+
+fn handle_hotkey(key_code: keyboard::KeyCode) -> Option<Message> {
+    use keyboard::KeyCode;
+    use pane_grid::{Axis, Direction};
+
+    let direction = match key_code {
+        KeyCode::Up => Some(Direction::Up),
+        KeyCode::Down => Some(Direction::Down),
+        KeyCode::Left => Some(Direction::Left),
+        KeyCode::Right => Some(Direction::Right),
+        _ => None,
+    };
+
+    match key_code {
+        KeyCode::V => Some(Message::SplitFocused(Axis::Vertical)),
+        KeyCode::H => Some(Message::SplitFocused(Axis::Horizontal)),
+        KeyCode::W => Some(Message::CloseFocused),
+        _ => direction.map(Message::FocusAdjacent),
+    }
+}
+
+struct Pane {
+    id: usize,
+    pub is_pinned: bool,
+}
+
+impl Pane {
+    fn new(id: usize) -> Self {
+        Self {
+            id,
+            is_pinned: false,
+        }
+    }
+}
+
+fn view_content<'a>(
+    pane: pane_grid::Pane,
+    total_panes: usize,
+    is_pinned: bool,
+    size: Size,
+) -> Element<'a, Message> {
+    let button = |label, message| {
+        button(
+            text(label)
+                .width(Length::Fill)
+                .horizontal_alignment(alignment::Horizontal::Center)
+                .size(16),
+        )
+        .width(Length::Fill)
+        .padding(8)
+        .on_press(message)
+    };
+
+    let mut controls = column![
+        button(
+            "Split horizontally",
+            Message::Split(pane_grid::Axis::Horizontal, pane),
+        ),
+        button(
+            "Split vertically",
+            Message::Split(pane_grid::Axis::Vertical, pane),
+        )
+    ]
+    .spacing(5)
+    .max_width(150);
+
+    if total_panes > 1 && !is_pinned {
+        controls = controls.push(
+            button("Close", Message::Close(pane))
+                .style(theme::Button::Destructive),
+        );
+    }
+
+    let content = column![
+        text(format!("{}x{}", size.width, size.height)).size(24),
+        controls,
+    ]
+    .width(Length::Fill)
+    .spacing(10)
+    .align_items(Alignment::Center);
+
+    container(scrollable(content))
+        .width(Length::Fill)
+        .height(Length::Fill)
+        .padding(5)
+        .center_y()
+        .into()
+}
+
+fn view_controls<'a>(
+    pane: pane_grid::Pane,
+    total_panes: usize,
+    is_pinned: bool,
+) -> Element<'a, Message> {
+    let mut button = button(text("Close").size(14))
+        .style(theme::Button::Destructive)
+        .padding(3);
+
+    if total_panes > 1 && !is_pinned {
+        button = button.on_press(Message::Close(pane));
+    }
+
+    button.into()
+}
+
+mod style {
+    use iced::widget::container;
+    use iced::Theme;
+
+    pub fn title_bar_active(theme: &Theme) -> container::Appearance {
+        let palette = theme.extended_palette();
+
+        container::Appearance {
+            text_color: Some(palette.background.strong.text),
+            background: Some(palette.background.strong.color.into()),
+            ..Default::default()
+        }
+    }
+
+    pub fn title_bar_focused(theme: &Theme) -> container::Appearance {
+        let palette = theme.extended_palette();
+
+        container::Appearance {
+            text_color: Some(palette.primary.strong.text),
+            background: Some(palette.primary.strong.color.into()),
+            ..Default::default()
+        }
+    }
+
+    pub fn pane_active(theme: &Theme) -> container::Appearance {
+        let palette = theme.extended_palette();
+
+        container::Appearance {
+            background: Some(palette.background.weak.color.into()),
+            border_width: 2.0,
+            border_color: palette.background.strong.color,
+            ..Default::default()
+        }
+    }
+
+    pub fn pane_focused(theme: &Theme) -> container::Appearance {
+        let palette = theme.extended_palette();
+
+        container::Appearance {
+            background: Some(palette.background.weak.color.into()),
+            border_width: 2.0,
+            border_color: palette.primary.strong.color,
+            ..Default::default()
+        }
+    }
+}