RestorableSelectionByNode.java

/*
 * Copyright 2003-2015 JetBrains s.r.o.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package jetbrains.mps.nodeEditor.selectionRestoring;

import jetbrains.mps.editor.runtime.selection.SelectionUtil;
import jetbrains.mps.openapi.editor.EditorContext;
import jetbrains.mps.openapi.editor.selection.SelectionManager;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.mps.openapi.model.SNode;

/**
 * @author simon
 */
public class RestorableSelectionByNode implements RestorableSelection{

  private final @NotNull SNode myNode;
  private SelectionAnchor myAnchor;

  public RestorableSelectionByNode(@NotNull SNode node){
    myNode = node;
  }

  public RestorableSelectionByNode(@NotNull SNode node, SelectionAnchor anchor){
    myNode = node;
    myAnchor = anchor;
  }

  @Override
  public boolean restore(EditorContext editorContext) {
    if (myAnchor == null) {
      editorContext.getSelectionManager().setSelection(myNode);
    } else {
      switch (myAnchor) {
        case START:
          SelectionUtil.selectLabelCellAnSetCaret(editorContext, myNode, SelectionManager.FIRST_CELL, 0);
          break;
        case END:
          SelectionUtil.selectLabelCellAnSetCaret(editorContext, myNode, SelectionManager.LAST_CELL, -1);
      }
    }
    return editorContext.getSelectionManager().getSelection() != null;
  }

  public enum SelectionAnchor {
    START,
    END
  }
}