Added native file chooser, fixed macOS prefs errors

desktop/src/io/anuke/mindustry/desktop/DesktopLauncher.java

@@ -8,6 +8,7 @@ import io.anuke.kryonet.KryoServer;
 import io.anuke.mindustry.Mindustry;
 import io.anuke.mindustry.core.Platform;
 import io.anuke.mindustry.net.Net;
+import io.anuke.ucore.UCore;
 import io.anuke.ucore.util.OS;
 
 public class DesktopLauncher {
@@ -20,7 +21,7 @@ public class DesktopLauncher {
 		config.setWindowedMode(960, 540);
 		config.setWindowIcon("sprites/icon.png");
 		if(OS.isMac) {
-            config.setPreferencesConfig(System.getProperty("DocumentsDirectory"), FileType.Absolute);
+            config.setPreferencesConfig(UCore.getProperty("user.home") + "/Library/Application Support/", FileType.Absolute);
         }
 
         Platform.instance = new DesktopPlatform(arg);

desktop/src/io/anuke/mindustry/desktop/DesktopPlatform.java

@@ -3,17 +3,25 @@ package io.anuke.mindustry.desktop;
 import club.minnced.discord.rpc.DiscordEventHandlers;
 import club.minnced.discord.rpc.DiscordRPC;
 import club.minnced.discord.rpc.DiscordRichPresence;
+import com.badlogic.gdx.Gdx;
+import com.badlogic.gdx.files.FileHandle;
 import com.badlogic.gdx.utils.Base64Coder;
 import io.anuke.kryonet.DefaultThreadImpl;
 import io.anuke.mindustry.core.GameState.State;
-import io.anuke.mindustry.core.ThreadHandler.ThreadProvider;
 import io.anuke.mindustry.core.Platform;
+import io.anuke.mindustry.core.ThreadHandler.ThreadProvider;
 import io.anuke.mindustry.net.Net;
 import io.anuke.ucore.UCore;
 import io.anuke.ucore.core.Settings;
+import io.anuke.ucore.function.Consumer;
 import io.anuke.ucore.util.Strings;
+import javafx.application.Application;
+import javafx.stage.FileChooser;
+import javafx.stage.FileChooser.ExtensionFilter;
+import javafx.stage.Stage;
 
 import javax.swing.*;
+import java.io.File;
 import java.net.NetworkInterface;
 import java.text.DateFormat;
 import java.text.NumberFormat;
@@ -40,6 +48,19 @@ public class DesktopPlatform extends Platform {
         }
     }
 
+    @Override
+    public void showFileChooser(String text, String content, Consumer<FileHandle> cons, boolean open, String... filter) {
+        new Thread(() -> {
+            FxApp.text = text;
+            FxApp.cons = cons;
+            FxApp.filter = filter;
+            FxApp.open = open;
+            FxApp.open();
+        }){{
+            setDaemon(true);
+        }}.start();
+    }
+
     @Override
     public String format(Date date){
         return format.format(date);
@@ -139,4 +160,56 @@ public class DesktopPlatform extends Platform {
         System.arraycopy(bytes, 0, result, 0, bytes.length);
         return !new String(Base64Coder.encode(result)).equals("AAAAAAAAAOA=");
     }
+
+    public static class FxApp extends Application{
+        static String text;
+        static Consumer<FileHandle> cons;
+        static String[] filter;
+        static String content;
+        static boolean open;
+
+        private static FxApp instance;
+
+        static void open(){
+            if(instance == null){
+                launch();
+            }
+            ss();
+        }
+
+        static void ss(){
+            javafx.application.Platform.runLater(() -> instance.show());
+        }
+
+        public FxApp(){
+            instance = this;
+            ss();
+        }
+
+        @Override
+        public void start(Stage stage){
+
+        }
+
+        public void show(){
+            for(int i = 0; i < filter.length; i ++){
+                filter[i] = "*." + filter[i];
+            }
+
+            FileChooser chooser = new FileChooser();
+            chooser.setTitle(text);
+            chooser.getExtensionFilters().add(new ExtensionFilter(content, filter));
+            chooser.setInitialDirectory(new File(System.getProperty("user.home")));
+
+            File file;
+            if (open) {
+                file = chooser.showOpenDialog(null);
+            } else {
+                file = chooser.showSaveDialog(null);
+            }
+            if (file != null) {
+                cons.accept(Gdx.files.absolute(file.getAbsolutePath()));
+            }
+        }
+    }
 }