nativeshell 0.1.0

NativeShell Rust package
Documentation 
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use std::ffi::c_void;

use glib::translate::ToGlibPtr;
use gtk::WidgetExt;

use crate::shell::platform::key_interceptor::override_key_event;

use super::{
    binary_messenger::PlatformBinaryMessenger,
    error::PlatformResult,
    flutter::{self, EngineExt, ViewExt},
    flutter_sys,
};

pub struct PlatformEngine {
    pub(super) view: flutter::View,
}

#[repr(C)]
struct _FlEngine {
    _parent_instance: gobject_sys::GObject,
    _thread: isize,
    _project: isize,
    _renderer: isize,
    _binary_messenger: isize,
    _settings_plugin: isize,
    _task_runner: isize,
    _aot_data: isize,
    _engine: isize,
}

impl PlatformEngine {
    pub fn new() -> Self {
        let project = flutter::DartProject::new();
        let view = flutter::View::new(&project);
        PlatformEngine { view }
    }

    pub fn new_binary_messenger(&self) -> PlatformBinaryMessenger {
        PlatformBinaryMessenger::new(self.view.get_engine().get_binary_messenger())
    }

    fn override_key_event(&self) {
        let engine = self.view.get_engine();
        let engine: *mut flutter_sys::FlEngine = engine.to_glib_none().0;
        let engine = engine as *mut u8;
        let api = unsafe { engine.add(std::mem::size_of::<_FlEngine>()) } as *mut c_void;
        override_key_event(api);
    }

    pub fn launch(&mut self) -> PlatformResult<()> {
        // This assumes the view has already been added to GtkWindow
        self.view.realize();
        self.override_key_event();
        Ok(())
    }

    pub fn shut_down(&mut self) -> PlatformResult<()> {
        Ok(())
    }
}