platform/platform-impl/src/com/intellij/openapi/editor/actions/StartNewLineAction.java

/*
 * Copyright 2000-2014 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 com.intellij.openapi.editor.actions;

import com.intellij.openapi.actionSystem.DataContext;
import com.intellij.openapi.actionSystem.IdeActions;
import com.intellij.openapi.editor.Caret;
import com.intellij.openapi.editor.Editor;
import com.intellij.openapi.editor.LogicalPosition;
import com.intellij.openapi.editor.actionSystem.EditorAction;
import com.intellij.openapi.editor.actionSystem.EditorActionHandler;
import com.intellij.openapi.editor.actionSystem.EditorActionManager;
import com.intellij.openapi.editor.actionSystem.EditorWriteActionHandler;
import com.intellij.openapi.ide.CopyPasteManager;
import org.jetbrains.annotations.NotNull;

/**
 * @author max
 */
public class StartNewLineAction extends EditorAction {
  public StartNewLineAction() {
    super(new Handler());
  }

  private static class Handler extends EditorWriteActionHandler {
    public Handler() {
      super(true);
    }

    @Override
    public boolean isEnabledForCaret(@NotNull Editor editor, @NotNull Caret caret, DataContext dataContext) {
      return getEnterHandler().isEnabled(editor, caret, dataContext);
    }

    @Override
    public void executeWriteAction(Editor editor, Caret caret, DataContext dataContext) {
      CopyPasteManager.getInstance().stopKillRings();
      if (editor.getDocument().getLineCount() != 0) {
        editor.getSelectionModel().removeSelection();
        LogicalPosition caretPosition = editor.getCaretModel().getLogicalPosition();
        int lineEndOffset = editor.getDocument().getLineEndOffset(caretPosition.line);
        editor.getCaretModel().moveToOffset(lineEndOffset);
      }

      getEnterHandler().execute(editor, caret, dataContext);
    }

    private static EditorActionHandler getEnterHandler() {
      return EditorActionManager.getInstance().getActionHandler(IdeActions.ACTION_EDITOR_ENTER);
    }
  }
}