ErrorDiffViewer.java

/*
 * Copyright 2000-2016 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.diff.impl;

import com.intellij.ide.DataManager;
import com.intellij.openapi.actionSystem.ActionManager;
import com.intellij.openapi.diff.*;
import com.intellij.util.ui.JBUI;
import com.intellij.util.ui.UIUtil;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import javax.swing.*;
import java.awt.*;

/**
 * This viewer is shown, when the compared contents are equal or differ only in line separators.
 *
 * @author Irina.Chernushina
 * @author Kirill Likhodedov
 */
public class ErrorDiffViewer implements DiffViewer {
  @NotNull private final DiffRequest myRequest;

  @NotNull private final JPanel myPanel;
  @NotNull private final DiffToolbarComponent myToolbar;

  protected ErrorDiffViewer(Window window, @NotNull DiffRequest request) {
    myRequest = request;

    myPanel = new JPanel(new BorderLayout());
    myPanel.setFocusable(true);
    DataManager.registerDataProvider(myPanel, dataId -> myRequest.getGenericData().get(dataId));

    final ActionManager actionManager = ActionManager.getInstance();
    myToolbar = new DiffToolbarComponent(myPanel);
    final DiffRequest.ToolbarAddons addons = new DiffRequest.ToolbarAddons() {
      @Override
      public void customize(DiffToolbar toolbar) {
        toolbar.addAction(actionManager.getAction("DiffPanel.Toolbar"));
        toolbar.addAction(actionManager.getAction("ContextHelp"));
        toolbar.addSeparator();
      }
    };
    myToolbar.resetToolbar(addons);
    final DiffToolbarImpl toolbar = myToolbar.getToolbar();
    myRequest.customizeToolbar(toolbar);
    /*group.addAction(actionManager.getAction("Diff.PrevChange"));
    group.addAction(actionManager.getAction("Diff.NextChange"));*/

    myPanel.add(myToolbar, BorderLayout.NORTH);

    DiffContent content1 = myRequest.getContents()[0];
    DiffContent content2 = myRequest.getContents()[1];

    String message;
    if (DiffUtil.oneIsUnknown(content1, content2)) {
      message = DiffBundle.message("diff.can.not.show.unknown");
    }
    else {
      message = DiffBundle.message("diff.can.not.show");
    }

    final JPanel messagePanel = createMessagePanel(message);
    myPanel.add(messagePanel, BorderLayout.CENTER);

    setWindowTitle(window, request.getWindowTitle());
  }

  private static void setWindowTitle(Window window, String title) {
    if (title == null || title.isEmpty()) title = "Diff";
    if (window instanceof JDialog) {
      ((JDialog)window).setTitle(title);
    }
    else if (window instanceof JFrame) ((JFrame)window).setTitle(title);
  }

  @Override
  public boolean canShowRequest(DiffRequest request) {
    return false;
  }

  @Override
  public void setDiffRequest(DiffRequest request) {
    throw new IllegalStateException();
  }

  @Override
  public JComponent getComponent() {
    return myPanel;
  }

  @NotNull
  private static JPanel createMessagePanel(@NotNull String message) {
    final JLabel label = new JLabel(message);
    label.setForeground(UIUtil.getInactiveTextColor());
    final JPanel wrapper = new JPanel(new GridBagLayout());
    wrapper.add(label,
                new GridBagConstraints(0, 0, 1, 1, 0, 0, GridBagConstraints.CENTER, GridBagConstraints.NONE, JBUI.insets(1), 0, 0));
    return wrapper;
  }

  @Nullable
  @Override
  public JComponent getPreferredFocusedComponent() {
    return myPanel;
  }

  @Override
  public int getContentsNumber() {
    return 0;
  }

  @Override
  public boolean acceptsType(DiffViewerType type) {
    return DiffViewerType.empty.equals(type);
  }
}