AsciiDocSplitEditor.java

package org.asciidoc.intellij.editor;

import com.intellij.openapi.editor.Editor;
import com.intellij.openapi.editor.event.CaretAdapter;
import com.intellij.openapi.editor.event.CaretEvent;
import com.intellij.openapi.fileEditor.TextEditor;
import com.intellij.pom.Navigatable;
import org.asciidoc.intellij.ui.SplitFileEditor;
import org.jetbrains.annotations.NotNull;

public class AsciiDocSplitEditor extends SplitFileEditor<TextEditor, AsciiDocPreviewEditor> implements TextEditor {
  public AsciiDocSplitEditor(@NotNull TextEditor mainEditor,
                             @NotNull AsciiDocPreviewEditor secondEditor) {
    super(mainEditor, secondEditor);

    mainEditor.getEditor().getCaretModel().addCaretListener(new MyCaretListener(secondEditor));
  }

  @Override
  protected void adjustEditorsVisibility() {
    super.adjustEditorsVisibility();
    getSecondEditor().renderIfVisible();
  }

  @NotNull
  @Override
  public String getName() {
    return "AsciiDoc split editor";
  }

  @NotNull
  @Override
  public Editor getEditor() {
    return getMainEditor().getEditor();
  }

  @Override
  public boolean canNavigateTo(@NotNull Navigatable navigatable) {
    return getMainEditor().canNavigateTo(navigatable);
  }

  @Override
  public void navigateTo(@NotNull Navigatable navigatable) {
    getMainEditor().navigateTo(navigatable);
  }

  private static class MyCaretListener extends CaretAdapter {
    @NotNull
    private final AsciiDocPreviewEditor myPreviewFileEditor;

    public MyCaretListener(@NotNull AsciiDocPreviewEditor previewFileEditor) {
      myPreviewFileEditor = previewFileEditor;
    }

    @Override
    public void caretPositionChanged(CaretEvent e) {
      final Editor editor = e.getEditor();
      if (editor.getCaretModel().getCaretCount() != 1) {
        return;
      }

      myPreviewFileEditor.scrollToLine(e.getNewPosition().line);
    }
  }
}