platform/platform-impl/src/com/intellij/ide/actions/JumpToLastEditAction.java

   1 /*
   2  * Copyright 2000-2009 JetBrains s.r.o.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 package com.intellij.ide.actions;
  17
  18 import com.intellij.openapi.actionSystem.*;
  19 import com.intellij.openapi.fileEditor.ex.IdeDocumentHistory;
  20 import com.intellij.openapi.project.Project;
  21 import com.intellij.openapi.project.DumbAware;
  22
  23 public class JumpToLastEditAction extends AnAction implements DumbAware {
  24   public void actionPerformed(AnActionEvent e) {
  25     Project project = PlatformDataKeys.PROJECT.getData(e.getDataContext());
  26     if (project == null) return;
  27     IdeDocumentHistory.getInstance(project).navigatePreviousChange();
  28   }
  29
  30   public void update(AnActionEvent event){
  31     Presentation presentation = event.getPresentation();
  32     DataContext dataContext = event.getDataContext();
  33     Project project = PlatformDataKeys.PROJECT.getData(dataContext);
  34     if (project == null) {
  35       presentation.setEnabled(false);
  36       return;
  37     }
  38     presentation.setEnabled(IdeDocumentHistory.getInstance(project).isNavigatePreviousChangeAvailable());
  39   }
  40 }