platform/vcs-impl/src/com/intellij/openapi/vcs/changes/actions/ShowChangeAbstractAction.java

/*
 * Copyright 2000-2012 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.vcs.changes.actions;

import com.intellij.openapi.actionSystem.AnActionEvent;
import com.intellij.openapi.actionSystem.CommonDataKeys;
import com.intellij.openapi.actionSystem.PlatformDataKeys;
import com.intellij.openapi.diff.DiffManager;
import com.intellij.openapi.diff.DiffRequest;
import com.intellij.openapi.diff.DiffViewer;
import com.intellij.openapi.project.DumbAwareAction;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.vcs.VcsDataKeys;
import com.intellij.openapi.vcs.changes.ChangeRequestChain;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import java.awt.*;

/**
 * @author Kirill Likhodedov
 */
abstract class ShowChangeAbstractAction extends DumbAwareAction {

  ShowChangeAbstractAction() {
    setEnabledInModalContext(true);
  }

  public void update(AnActionEvent e) {
    final ChangeRequestChain chain = e.getData(VcsDataKeys.DIFF_REQUEST_CHAIN);
    e.getPresentation().setEnabled(chain != null && isEnabled(chain));
  }

  protected abstract boolean isEnabled(@NotNull ChangeRequestChain chain);

  public void actionPerformed(AnActionEvent e) {
    final Project project = e.getData(CommonDataKeys.PROJECT);
    final ChangeRequestChain chain = e.getData(VcsDataKeys.DIFF_REQUEST_CHAIN);
    if (project == null || chain == null || !isEnabled(chain)) {
      return;
    }

    DiffViewer diffViewer = e.getData(PlatformDataKeys.COMPOSITE_DIFF_VIEWER);
    if (diffViewer == null) {
      diffViewer = e.getData(PlatformDataKeys.DIFF_VIEWER);
    }
    if (diffViewer == null) {
      return;
    }

    actionPerformed(e, project, chain, diffViewer);
  }

  protected void openRequest(@NotNull DiffViewer diffViewer, @Nullable DiffRequest request) {
    if (request != null) {
      if (diffViewer.acceptsType(request.getType())) {
        diffViewer.setDiffRequest(request);
      }
      else {
        final Window window = KeyboardFocusManager.getCurrentKeyboardFocusManager().getActiveWindow();
        if (window != null) {
          window.setVisible(false);
        }
        DiffManager.getInstance().getDiffTool().show(request);
      }
    }
  }

  protected abstract void actionPerformed(@NotNull AnActionEvent e, @NotNull Project project, @NotNull ChangeRequestChain chain,
                                          @NotNull DiffViewer diffViewer);
}