Implement everything, even some examples!

.gitignore

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+# IntelliJ
+*.iml
+.idea/
+
+# Eclipse
+.settings/
+.project
+.classpath
+.metadata
+
+# Common
+target/
+.DS_Store
+__MACOSX
+
+/webview*
+/libwebview*
+/WebView*

Example.java

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+package dev.webview;
+
+public class Example {
+
+    public static void main(String[] args) {
+        Webview wv = new Webview(); // Can optionally be created with an AWT component to be painted on.
+
+        // Calling `await echo(1,2,3)` will return `[1,2,3]`
+        wv.bind("echo", (arguments) -> {
+            return arguments;
+        });
+
+        wv.loadURL("https://google.com");
+
+        // Run the webview event loop, the webview is fully disposed when this returns.
+        wv.run();
+    }
+
+}

README.md

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+# Webview
+
+A (new!) Java port of the [webview project](https://github.com/webview/webview). It uses JNA under the hood to interface with the webview library.
+
+## How to use
+
+1) Include the libary in your project (see the [JitPack page](https://jitpack.io/#Casterlabs/webview)).
+2) Copy and run the example in `Example.java`.
+3) Profit!
+
+## TODO
+
+Build our own DLLs and whatnot, the current ones are copied from the C# port.

SwingExample.java

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+package dev.webview;
+
+import java.awt.BorderLayout;
+import java.awt.Component;
+import java.awt.event.WindowAdapter;
+import java.awt.event.WindowEvent;
+
+import javax.swing.JFrame;
+
+public class SwingExample {
+
+    public static void main(String[] args) {
+        JFrame frame = new JFrame();
+
+        frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
+        frame.setLayout(new BorderLayout());
+
+        // Using createAWT allows you to defer the creation of the webview until the
+        // canvas is fully renderable.
+        Component component = Webview.createAWT((wv) -> {
+            // Calling `await echo(1,2,3)` will return `[1,2,3]`
+            wv.bind("echo", (arguments) -> {
+                return arguments;
+            });
+
+            wv.loadURL("https://google.com");
+
+            frame.addWindowListener(new WindowAdapter() {
+                @Override
+                public void windowClosing(WindowEvent e) {
+                    wv.close();
+                    frame.dispose();
+                    System.exit(0);
+                }
+            });
+
+            // Run the webview event loop, the webview is fully disposed when this returns.
+            wv.run();
+        });
+
+        frame.getContentPane().add(component, BorderLayout.CENTER);
+
+        frame.setSize(800, 600);
+        frame.setVisible(true);
+    }
+
+}

pom.xml

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+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<groupId>dev.webview</groupId>
+	<artifactId>Webview</artifactId>
+	<version>1.0.0</version>
+
+	<properties>
+		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
+	</properties>
+
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-compiler-plugin</artifactId>
+				<version>3.8.1</version>
+				<configuration>
+					<source>11</source>
+					<target>11</target>
+				</configuration>
+			</plugin>
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-jar-plugin</artifactId>
+				<version>2.3.2</version>
+				<configuration>
+					<finalName>${project.name}-original</finalName>
+				</configuration>
+			</plugin>
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-shade-plugin</artifactId>
+				<version>3.2.1</version>
+				<executions>
+					<execution>
+						<id>shade</id>
+						<phase>package</phase>
+						<goals>
+							<goal>shade</goal>
+						</goals>
+					</execution>
+				</executions>
+				<configuration>
+					<shadedArtifactAttached>true</shadedArtifactAttached>
+					<finalName>${project.name}</finalName>
+				</configuration>
+			</plugin>
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-source-plugin</artifactId>
+				<version>3.1.0</version>
+				<configuration>
+					<finalName>${project.name}</finalName>
+				</configuration>
+				<executions>
+					<execution>
+						<id>attach-sources</id>
+						<goals>
+							<goal>jar</goal>
+						</goals>
+					</execution>
+				</executions>
+			</plugin>
+		</plugins>
+	</build>
+
+	<repositories>
+		<repository>
+			<id>jitpack.io</id>
+			<url>https://jitpack.io</url>
+		</repository>
+	</repositories>
+
+	<dependencies>
+
+		<!-- Code related packages -->
+		<dependency>
+			<groupId>org.projectlombok</groupId>
+			<artifactId>lombok</artifactId>
+			<version>1.18.22</version>
+			<scope>provided</scope>
+		</dependency>
+		<dependency>
+			<!-- For Eclipse users -->
+			<groupId>org.jetbrains</groupId>
+			<artifactId>annotations</artifactId>
+			<version>19.0.0</version>
+			<scope>provided</scope>
+		</dependency>
+
+		<dependency>
+			<groupId>com.github.casterlabs.rakurai</groupId>
+			<artifactId>Json</artifactId>
+			<version>1.13.0</version>
+			<scope>compile</scope>
+		</dependency>
+		<dependency>
+			<groupId>com.github.casterlabs.rakurai</groupId>
+			<artifactId>Util</artifactId>
+			<version>1.13.0</version>
+			<scope>compile</scope>
+		</dependency>
+
+		<dependency>
+			<groupId>net.java.dev.jna</groupId>
+			<artifactId>jna</artifactId>
+			<version>5.10.0</version>
+			<scope>compile</scope>
+		</dependency>
+		<dependency>
+			<groupId>net.java.dev.jna</groupId>
+			<artifactId>jna-platform</artifactId>
+			<version>5.10.0</version>
+			<scope>compile</scope>
+		</dependency>
+
+	</dependencies>
+
+</project>

src/main/java/dev/webview/ConsumingProducer.java

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+package dev.webview;
+
+import org.jetbrains.annotations.Nullable;
+
+import lombok.NonNull;
+
+public interface ConsumingProducer<C, P> {
+
+    public @Nullable P produce(@Nullable C consume) throws InterruptedException;
+
+    public static <C, P> ConsumingProducer<C, P> of(@NonNull Class<C> consumingClazz, @Nullable P result) {
+        return (aVoid) -> {
+            return result;
+        };
+    }
+
+}

src/main/java/dev/webview/Pair.java

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+package dev.webview;
+
+import lombok.AllArgsConstructor;
+
+@AllArgsConstructor
+public class Pair<A, B> {
+    public final A a;
+    public final B b;
+
+}

src/main/java/dev/webview/Platform.java

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+package dev.webview;
+
+import java.util.regex.Pattern;
+
+import lombok.AllArgsConstructor;
+
+@AllArgsConstructor
+public enum Platform {
+	// @formatter:off
+    MACOSX   ("macOS",    "mac|darwin"),
+    LINUX    ("Linux",    "nux"),
+    WINDOWS  ("Windows",  "win");
+    // @formatter:on
+
+	private String str;
+	private String regex;
+
+	static Platform get() {
+		String osName = System.getProperty("os.name").toLowerCase();
+
+		for (Platform os : values()) {
+			if (Pattern.compile(os.regex).matcher(osName).find()) {
+				return os;
+			}
+		}
+
+		throw new UnsupportedOperationException("Unknown operating system: " + osName);
+	}
+
+	@Override
+	public String toString() {
+		return this.str;
+	}
+
+}