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use window;
use gl;
use na as math;
use window::{Window, WindowT, EventsPoll};
use events::StreamT;
use util::Result;

use std::cell::RefCell;
use std::path::PathBuf;

pub struct Application<App>{
    app: RefCell<App>,
    window: window::Window,
    events: EventsPoll,
    renderer: gl::Renderer<'static>,
}

impl<App: ApplicationCallbacks> Application<App>{
    pub fn new(app: App, events: EventsPoll, window: Window, renderer: gl::Renderer<'static>) -> Result<Application<App>>{
        Ok(Application{
            app: RefCell::new(app),
            events,
            window,
            renderer
        })
    }

    pub fn run(&mut self){
        let mut events = self.window.event_stream().iter_async();
        while !self.window.should_close(){
            let frame_time_s = self.window.curr_frame_time_s();

			self.window.make_current();

			self.app.borrow_mut().update(frame_time_s, &mut self.renderer, &self.window);
			self.app.borrow_mut().draw(&mut self.renderer, &self.window);

            self.window.swap_buffers();

            self.events.poll_events();
            self.window.update();

			for event in events.by_ref(){
	            self.handle_event(&event);
			}

        }
    }

    #[cfg(not(target_os="android"))]
    fn handle_event(&mut self, event: &window::Event){
        //if let &events::Next(ref _time, ref event) = event{
        let mut app = self.app.borrow_mut();
        match *event{
            window::Event::KeyPressed{key, mods, repeat}	    => {app.key_pressed(key,mods,repeat);},
            window::Event::KeyReleased{key}     => {app.key_released(key);}
            window::Event::MouseMoved{pos}        => {app.mouse_moved(pos);}
            window::Event::MousePressed{pos,button,mods}   => {app.mouse_pressed(pos,button,mods);}
            window::Event::MouseReleased{pos,button,mods}  => {app.mouse_released(pos,button,mods);}
            window::Event::WindowMoved{pos}       => {app.window_moved(pos);}
            window::Event::WindowResized{size}    => {app.window_resized(size);}
            window::Event::Scroll{scroll}         => {app.scroll(scroll);}
            window::Event::WindowClosing          => {app.window_closing();}
            _ => {}
        }
	    //}
    }

    #[cfg(target_os="android")]
    fn handle_event(&mut self, event: &(u64,WindowEvent)){
        let &(_time,event) = event;
        match event{
            KeyPressedEvent{key}	    => {app.borrow_mut().key_pressed(key);},
            KeyReleasedEvent{key}       => {app.borrow_mut().key_released(key);},
            MouseMovedEvent{pos}        => {app.borrow_mut().mouse_moved(pos);}
            MousePressedEvent{pos,button}   => {app.borrow_mut().mouse_pressed(pos,button);}
            MouseReleasedEvent{pos,button}  => {app.borrow_mut().mouse_released(pos,button);}
            WindowMovedEvent{pos}       => {app.borrow_mut().window_moved(pos);}
            WindowResizedEvent{size}    => {app.borrow_mut().window_resized(size);}
            ScrollEvent{scroll}         => {app.borrow_mut().scroll(scroll);}
            WindowClosingEvent          => {
                debug!("closing");
                app.borrow_mut().window_closing();
            }
            PauseEvent                  => {
                debug!("pause");
                app_data.borrow().window.borrow_mut().set_should_close();
                app.borrow_mut().pause();
            }
            StopEvent                   => {
                debug!("stop");
                app_data.borrow().window.borrow_mut().set_should_close();
                app.borrow_mut().stop();
            }
            ResumeEvent                 => {
                debug!("resume");
                app.borrow_mut().resume();
            }
            DestroyEvent                => {
                debug!("destroy");
                app_data.borrow().window.borrow_mut().set_should_close();
                app.borrow_mut().destroy();
            }
            GLReadyEvent                => {app.borrow_mut().gl_ready();}
            _ => {}
        }
    }
}

#[cfg(not(target_os="android"))]
pub trait ApplicationCallbacks{
    fn update(&mut self, _delta: f64, _gl: &gl::Renderer, _window: &window::WindowT){}
    fn draw(&mut self, _gl: &gl::Renderer, _window: &window::WindowT){}

    fn key_pressed(&mut self, _key: window::Key, _mods: window::KeyModifiers, _repeat: bool){}
    fn key_released(&mut self, _key: window::Key){}

    fn mouse_moved(&mut self, _pos: math::Pnt2<f64>){}
    fn mouse_pressed(&mut self, _pos: math::Pnt2<f64>, _button: window::MouseButton, _mods: window::KeyModifiers){}
    fn mouse_released(&mut self, _pos: math::Pnt2<f64>, _button: window::MouseButton, _mods: window::KeyModifiers){}

    fn window_moved(&mut self, _pos: math::Pnt2<i32>){}
    fn window_resized(&mut self, _size: math::Vec2<i32>){}

    fn scroll(&mut self, _scroll: math::Vec2<f64>){}

    fn window_closing(&mut self){}
    fn dropped(&mut self, paths: &[PathBuf]){}
}

#[cfg(target_os="android")]
pub trait ApplicationCallbacks: window::LifeCycleListener + window::GLReadyListener{
    fn update<R: RendererMut>(&mut self, _frame_time_s: f64, gl: &mut R){}
    fn draw<R: RendererMut>(&mut self, gl: &mut R){}

    fn key_pressed(&mut self, _key: window::Key){}
    fn key_released(&mut self, _key: window::Key){}

    fn mouse_moved(&mut self, _pos: math::Pnt2<f64>){}
    fn mouse_pressed(&mut self, _pos: math::Pnt2<f64>, _button: window::MouseButton){}
    fn mouse_released(&mut self, _pos: math::Pnt2<f64>, _button: window::MouseButton){}

    fn window_moved(&mut self, _pos: math::Pnt2<i32>){}
    fn window_resized(&mut self, _size: math::Vec2<i32>){}

    fn scroll(&mut self, _scroll: math::Vec2<f64>){}

    fn window_closing(&mut self){}
    fn dropped(&mut self, paths: &[PathBuf]){}
}