RFR: WIP: 8236651: Simplify and update glass gtk backend

[Thiago Milczarek Sayao]

On Tue, 14 Jan 2020 11:30:49 GMT, Thiago Milczarek Sayao <tsayao at openjdk.org> wrote:

>> I understand. Will do that when the code works 100%. I have submitted the PR to avoid duplicated efforts and let people test it (if anyone is willing).
> 
> Sizing and positioning completed and fairly tested.
> 
> Will look into mouse grabbing.

Performance test (on my setup, it runs slightly faster with this patch):

import javafx.application.Application;
import javafx.application.Platform;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.stage.Stage;

import java.time.Duration;
import java.time.Instant;
import java.util.Timer;
import java.util.TimerTask;

public class HelloFx extends Application {

    public HelloFx() {
    }

    @Override
    public void start(Stage stage) {
        Instant start = Instant.now();

        Scene mainScene = new Scene(new Label("Perfomance test"), 600, 600);
        stage.setScene(mainScene);
        stage.show();

        for (int i=0; i<1000; i++) {
            Stage stage1 = new Stage();
            Scene scene = new Scene(new Label("hi"), 200, 200);
            stage1.setScene(scene);

            stage1.setOnShown(e -> new Timer().schedule(
                    new TimerTask() {
                        @Override
                        public void run() {
                            Platform.runLater(stage1::hide);
                        }
                    },
                    100
            ));

            stage1.showAndWait();
        }

        stage.close();

        Instant end = Instant.now();

        System.out.println(Duration.between(start, end).toString()
                .substring(2)
                .replaceAll("(\\d[HMS])(?!$)", "$1 ")
                .toLowerCase());

        Platform.exit();
    }
}

-------------

PR: https://git.openjdk.java.net/jfx/pull/77