it is done

core/src/mindustry/editor/MapSaveDialog.java

@@ -0,0 +1,73 @@
+package mindustry.editor;
+
+import arc.func.*;
+import arc.scene.ui.*;
+import mindustry.*;
+import mindustry.maps.*;
+import mindustry.ui.dialogs.*;
+
+import static mindustry.Vars.ui;
+
+public class MapSaveDialog extends FloatingDialog{
+    private TextField field;
+    private Cons<String> listener;
+
+    public MapSaveDialog(Cons<String> cons){
+        super("$editor.savemap");
+        field = new TextField();
+        listener = cons;
+
+        Vars.platform.addDialog(field);
+
+        shown(() -> {
+            cont.clear();
+            cont.label(() -> {
+                Map map = Vars.maps.byName(field.getText());
+                if(map != null){
+                    if(map.custom){
+                        return "$editor.overwrite";
+                    }else{
+                        return "$editor.failoverwrite";
+                    }
+                }
+                return "";
+            }).colspan(2);
+            cont.row();
+            cont.add("$editor.mapname").padRight(14f);
+            cont.add(field).size(220f, 48f);
+        });
+
+        buttons.defaults().size(200f, 50f).pad(2f);
+        buttons.addButton("$cancel", this::hide);
+
+        TextButton button = new TextButton("$save");
+        button.clicked(() -> {
+            if(!invalid()){
+                cons.get(field.getText());
+                hide();
+            }
+        });
+        button.setDisabled(this::invalid);
+        buttons.add(button);
+    }
+
+    public void save(){
+        if(!invalid()){
+            listener.get(field.getText());
+        }else{
+            ui.showErrorMessage("$editor.failoverwrite");
+        }
+    }
+
+    public void setFieldText(String text){
+        field.setText(text);
+    }
+
+    private boolean invalid(){
+        if(field.getText().isEmpty()){
+            return true;
+        }
+        Map map = Vars.maps.byName(field.getText());
+        return map != null && !map.custom;
+    }
+}