patina/examples/simplest.rs

use patina::{prelude::*, ui::UIControlMsg, window::WindowComponent};

/// struct to represent a window and dispatch event processing within it
struct SimpleWindow {
    widget: <Self as WindowComponent>::RootWidget,
}

impl SimpleWindow {
    fn new(uih: &mut patina::ui::UIHandle) -> Self {
        Self {
            widget: patina::widget::Frame::new(uih),
        }
    }
}

/// messages that can be sent to the window component
enum SimpleWindowMsg {
    Close,
}

/// internal message handling
impl Component for SimpleWindow {
    type ParentMsg = UIControlMsg;
    type Msg = SimpleWindowMsg;

    fn process(&mut self, msg: Self::Msg) -> Vec<Self::ParentMsg> {
        match msg {
            SimpleWindowMsg::Close => vec![UIControlMsg::Terminate],
        }
    }
}

/// window-specific event handling
impl WindowComponent for SimpleWindow {
    fn map_window_event(&self, we: patina::window::WindowEvent) -> Option<Self::Msg> {
        match we {
            patina::window::WindowEvent::CloseRequested => Some(SimpleWindowMsg::Close),
            _ => None,
        }
    }

    type RootWidget = patina::widget::Frame<Self>;
    fn root_widget(&self) -> &Self::RootWidget {
        &self.widget
    }
    fn root_widget_mut(&mut self) -> &mut Self::RootWidget {
        &mut self.widget
    }
}

fn main() {
    // see the docs for make_opinionated_ui
    patina::ui::make_opinionated_ui(SimpleWindow::new).run();
}