Native multi file chooser

core/src/mindustry/core/Platform.java

@@ -143,49 +143,7 @@ public interface Platform{
      */
     default void showFileChooser(boolean open, String title, String extension, Cons<Fi> cons){
         if(OS.isWindows || OS.isMac){
-            String formatted = (title.startsWith("@") ? Core.bundle.get(title.substring(1)) : title).replaceAll("\"", "'");
+            showNativeFileChooser(open, title, cons, extension);
-
-            //native file dialog
-            Threads.daemon(() -> {
-                try{
-                    FileDialogs.loadNatives();
-
-                    String result;
-                    //on MacOS, .msav is not properly recognized until I put garbage into the array?
-                    String[] extensions = OS.isMac && open ? new String[]{"", "*." + extension} : new String[]{"*." + extension};
-
-                    if(open){
-                        result = FileDialogs.openFileDialog(formatted, FileChooser.getLastDirectory().absolutePath(), extensions, "." + extension + " files", false);
-                    }else{
-                        result = FileDialogs.saveFileDialog(formatted, FileChooser.getLastDirectory().child("file." + extension).absolutePath(), extensions, "." + extension + " files");
-                    }
-
-                    if(result == null) return;
-
-                    if(result.length() > 1 && result.contains("\n")){
-                        result = result.split("\n")[0];
-                    }
-
-                    //cancelled selection, ignore result
-                    if(result.isEmpty() || result.equals("\n")) return;
-                    if(result.endsWith("\n")) result = result.substring(0, result.length() - 1);
-                    if(result.contains("\n")) throw new IOException("invalid input: \"" + result + "\"");
-
-                    Fi file = Core.files.absolute(result);
-                    Core.app.post(() -> {
-                        FileChooser.setLastDirectory(file.isDirectory() ? file : file.parent());
-
-                        if(!open){
-                            cons.get(file.parent().child(file.nameWithoutExtension() + "." + extension));
-                        }else{
-                            cons.get(file);
-                        }
-                    });
-                }catch(Throwable error){
-                    Log.err("Failure to execute native file chooser", error);
-                    Core.app.post(() -> defaultFileDialog(open, title, extension, cons));
-                }
-            });
         }else if(OS.isLinux && !OS.isAndroid){
             showZenity(open, title, new String[]{extension}, cons, () -> defaultFileDialog(open, title, extension, cons));
         }else{
@@ -268,6 +226,8 @@ public interface Platform{
     default void showMultiFileChooser(Cons<Fi> cons, String... extensions){
         if(mobile){
             showFileChooser(true, extensions[0], cons);
+        }else if(OS.isWindows || OS.isMac){
+            showNativeFileChooser(true, "@open", cons, extensions);
         }else if(OS.isLinux && !OS.isAndroid){
             showZenity(true, "@open", extensions, cons, () -> defaultMultiFileChooser(cons, extensions));
         }else{
@@ -279,6 +239,62 @@ public interface Platform{
         new FileChooser("@open", file -> Structs.contains(extensions, file.extension().toLowerCase()), true, cons).show();
     }
 
+    default void showNativeFileChooser(boolean open, String title, Cons<Fi> cons, String... shownExtensions){
+        String formatted = (title.startsWith("@") ? Core.bundle.get(title.substring(1)) : title).replaceAll("\"", "'");
+
+        //this should never happen unless someone is being dumb with the parameters
+        String[] ext = shownExtensions == null || shownExtensions.length == 0 ? new String[]{""} : shownExtensions;
+
+        //native file dialog
+        Threads.daemon(() -> {
+            try{
+                FileDialogs.loadNatives();
+
+                String result;
+                String[] patterns = new String[ext.length];
+                for(int i = 0; i < ext.length; i++){
+                    patterns[i] = "*." + ext[i];
+                }
+
+                //on MacOS, .msav is not properly recognized until I put garbage into the array?
+                if(patterns.length == 1 && OS.isMac && open){
+                    patterns = new String[]{"", "*." + ext[0]};
+                }
+
+                if(open){
+                    result = FileDialogs.openFileDialog(formatted, FileChooser.getLastDirectory().absolutePath(), patterns, "." + ext[0] + " files", false);
+                }else{
+                    result = FileDialogs.saveFileDialog(formatted, FileChooser.getLastDirectory().child("file." + ext[0]).absolutePath(), patterns, "." + ext[0] + " files");
+                }
+
+                if(result == null) return;
+
+                if(result.length() > 1 && result.contains("\n")){
+                    result = result.split("\n")[0];
+                }
+
+                //cancelled selection, ignore result
+                if(result.isEmpty() || result.equals("\n")) return;
+                if(result.endsWith("\n")) result = result.substring(0, result.length() - 1);
+                if(result.contains("\n")) throw new IOException("invalid input: \"" + result + "\"");
+
+                Fi file = Core.files.absolute(result);
+                Core.app.post(() -> {
+                    FileChooser.setLastDirectory(file.isDirectory() ? file : file.parent());
+
+                    if(!open){
+                        cons.get(file.parent().child(file.nameWithoutExtension() + "." + ext[0]));
+                    }else{
+                        cons.get(file);
+                    }
+                });
+            }catch(Throwable error){
+                Log.err("Failure to execute native file chooser", error);
+                Core.app.post(() -> defaultFileDialog(open, title, ext[0], cons));
+            }
+        });
+    }
+
     /** Hide the app. Android only. */
     default void hide(){
     }