platform/vcs-impl/src/com/intellij/openapi/vcs/actions/AbstractShowDiffAction.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.openapi.vcs.actions;
  17
  18 import com.intellij.openapi.actionSystem.AnActionEvent;
  19 import com.intellij.openapi.actionSystem.Presentation;
  20 import com.intellij.openapi.project.Project;
  21 import com.intellij.openapi.vcs.AbstractVcs;
  22 import com.intellij.openapi.vcs.FilePathImpl;
  23 import com.intellij.openapi.vcs.ProjectLevelVcsManager;
  24 import com.intellij.openapi.vcs.impl.ProjectLevelVcsManagerImpl;
  25 import com.intellij.openapi.vcs.impl.BackgroundableActionEnabledHandler;
  26 import com.intellij.openapi.vcs.impl.VcsBackgroundableActions;
  27 import com.intellij.openapi.vcs.diff.DiffProvider;
  28 import com.intellij.openapi.vfs.VirtualFile;
  29
  30 public abstract class AbstractShowDiffAction extends AbstractVcsAction{
  31
  32   protected void update(VcsContext vcsContext, Presentation presentation) {
  33     updateDiffAction(presentation, vcsContext, getKey());
  34   }
  35
  36   protected static void updateDiffAction(final Presentation presentation, final VcsContext vcsContext,
  37                                          final VcsBackgroundableActions actionKey) {
  38     presentation.setEnabled(isEnabled(vcsContext, actionKey));
  39     presentation.setVisible(isVisible(vcsContext));
  40   }
  41
  42   protected boolean forceSyncUpdate(final AnActionEvent e) {
  43     return true;
  44   }
  45
  46   protected abstract VcsBackgroundableActions getKey();
  47
  48   protected static boolean isVisible(final VcsContext vcsContext) {
  49     final Project project = vcsContext.getProject();
  50     if (project == null) return false;
  51     final AbstractVcs[] vcss = ProjectLevelVcsManager.getInstance(project).getAllActiveVcss();
  52     for (AbstractVcs vcs : vcss) {
  53       if (vcs.getDiffProvider() != null) {
  54         return true;
  55       }
  56     }
  57     return false;
  58   }
  59
  60   protected static boolean isEnabled(final VcsContext vcsContext, final VcsBackgroundableActions actionKey) {
  61     if (!(isVisible(vcsContext))) return false;
  62
  63     final Project project = vcsContext.getProject();
  64     if (project == null) return false;
  65     final ProjectLevelVcsManager vcsManager = ProjectLevelVcsManager.getInstance(project);
  66
  67     final VirtualFile[] selectedFilePaths = vcsContext.getSelectedFiles();
  68     if (selectedFilePaths == null || selectedFilePaths.length != 1) return false;
  69
  70     final VirtualFile selectedFile = selectedFilePaths[0];
  71     if (selectedFile.isDirectory()) return false;
  72
  73     final BackgroundableActionEnabledHandler handler = ((ProjectLevelVcsManagerImpl)vcsManager).getBackgroundableActionHandler(actionKey);
  74     if (handler.isInProgress(VcsBackgroundableActions.keyFrom(selectedFile))) return false;
  75
  76     final AbstractVcs vcs = vcsManager.getVcsFor(selectedFile);
  77     if (vcs == null) return false;
  78
  79     final DiffProvider diffProvider = vcs.getDiffProvider();
  80
  81     if (diffProvider == null) return false;
  82
  83     return AbstractVcs.fileInVcsByFileStatus(project, new FilePathImpl(selectedFile)) ;
  84   }
  85
  86
  87   protected void actionPerformed(VcsContext vcsContext) {
  88     final Project project = vcsContext.getProject();
  89     final VirtualFile selectedFile = vcsContext.getSelectedFiles()[0];
  90
  91     final ProjectLevelVcsManager vcsManager = ProjectLevelVcsManager.getInstance(project);
  92     final AbstractVcs vcs = vcsManager.getVcsFor(selectedFile);
  93     final DiffProvider diffProvider = vcs.getDiffProvider();
  94
  95     final DiffActionExecutor actionExecutor = getExecutor(diffProvider, selectedFile, project);
  96     actionExecutor.showDiff();
  97   }
  98
  99   protected DiffActionExecutor getExecutor(final DiffProvider diffProvider, final VirtualFile selectedFile, final Project project) {
 100     return new DiffActionExecutor.CompareToCurrentExecutor(diffProvider, selectedFile, project, getKey());
 101   }
 102 }