//! The smallest ltk app on Android: a counter in a NativeActivity, on the default theme the APK carries. `make android-apk` builds and packages it, `make android-install` puts it on the device `adb` sees.
//!
//! An Android app is a library the activity loads, so this example builds as a `cdylib` whose entry point is `android_main`.

#![ cfg( target_os = "android" ) ]

use ltk::{ App, ButtonVariant, Element, button, column, spacer, text };

#[ derive( Clone ) ]
enum Msg
{
	Press,
}

#[ derive( Default ) ]
struct Hello
{
	presses: u32,
}

impl App for Hello
{
	type Message = Msg;

	fn app_id( &self ) -> &str { "net.liberux.ltk.Hello" }
	fn save_state( &self ) -> Option<Vec<u8>> { None }
	fn restore_state( &mut self, _state: Vec<u8> ) {}

	fn view( &self ) -> Element<Msg>
	{
		let palette = ltk::theme_palette();
		column::<Msg>()
			.spacing( 16.0 )
			.push( spacer() )
			.push( text( "ltk on Android" ).size( 28.0 ).color( palette.text_primary ) )
			.push( text( format!( "Pressed {} times", self.presses ) ).size( 18.0 ).color( palette.text_secondary ) )
			.push( button::<Msg>( "Press" ).variant( ButtonVariant::Primary ).on_press( Msg::Press ) )
			.push( spacer() )
			.into()
	}

	fn update( &mut self, msg: Msg )
	{
		match msg
		{
			Msg::Press => self.presses += 1,
		}
	}
}

#[ no_mangle ]
fn android_main( app: ltk::AndroidApp )
{
	ltk::set_android_app( app );
	ltk::run( Hello::default() );
}