intellij-sdk-code-samples/simple_language_plugin/src/com/simpleplugin/SimpleStructureViewFactory.java

package com.simpleplugin;

import com.intellij.ide.structureView.*;
import com.intellij.lang.PsiStructureViewFactory;
import com.intellij.openapi.editor.Editor;
import com.intellij.psi.PsiFile;
import org.jetbrains.annotations.*;

public class SimpleStructureViewFactory implements PsiStructureViewFactory {
  @Nullable
  @Override
  public StructureViewBuilder getStructureViewBuilder(final PsiFile psiFile) {
    return new TreeBasedStructureViewBuilder() {
      @NotNull
      @Override
      public StructureViewModel createStructureViewModel(@Nullable Editor editor) {
        return new SimpleStructureViewModel(psiFile);
      }
    };
  }
}