vcs: Used "JBLoadingPanel" instead of "DetailsPanel"

"DetailsPanel" provided just panel with "Loading..." text - so similar
"JBLoadingPanel" is used instead. Removed "DetailsPanel".

platform/vcs-api/src/com/intellij/vcsUtil/UIVcsUtil.java

@@ -27,6 +27,7 @@ public class UIVcsUtil {
   private UIVcsUtil() {
   }
 
+  @SuppressWarnings("unused") // Required for compatibility with external plugins.
   public static JPanel errorPanel(final String text, boolean isError) {
     final JLabel label = new JLabel(XmlStringUtil.wrapInHtml(escapeXmlAndAddBr(text)));
     label.setForeground(isError ? SimpleTextAttributes.ERROR_ATTRIBUTES.getFgColor() : UIUtil.getInactiveTextColor());

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

@@ -24,6 +24,7 @@ import com.intellij.openapi.ui.MessageType;
 import com.intellij.openapi.util.Comparing;
 import com.intellij.openapi.vcs.VcsException;
 import com.intellij.openapi.vcs.ui.VcsBalloonProblemNotifier;
+import com.intellij.ui.components.JBLoadingPanel;
 import com.intellij.util.continuation.ModalityIgnorantBackgroundableTask;
 import org.jetbrains.annotations.CalledInAwt;
 import org.jetbrains.annotations.CalledInBackground;
@@ -31,6 +32,7 @@ import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
 import javax.swing.*;
+import java.awt.*;
 
 /**
  * For presentation, which is itself in GenericDetails (not necessarily) - shown from time to time, but cached, and
@@ -48,7 +50,7 @@ public abstract class AbstractRefreshablePanel<T> implements RefreshablePanel {
   private Ticket myCurrentlySelected;
   private Ticket mySetId;
   private final Ticket myTicket;
-  private final DetailsPanel myDetailsPanel;
+  private final JBLoadingPanel myDetailsPanel;
   private final BackgroundTaskQueue myQueue;
   private volatile boolean myDisposed;
 
@@ -57,8 +59,8 @@ public abstract class AbstractRefreshablePanel<T> implements RefreshablePanel {
     myLoadingTitle = loadingTitle;
     myQueue = queue;
     myTicket = new Ticket();
-    myDetailsPanel = new DetailsPanel();
-    myDetailsPanel.loading();
+    myDetailsPanel = new JBLoadingPanel(new BorderLayout(), this);
+    myDetailsPanel.setLoadingText("Loading...");
   }
 
   @CalledInAwt
@@ -75,7 +77,7 @@ public abstract class AbstractRefreshablePanel<T> implements RefreshablePanel {
         myQueue.run(new Loader(myProject, myLoadingTitle, copy));
       }
 
-      myDetailsPanel.loading();
+      myDetailsPanel.startLoading();
     } else {
       refreshPresentation();
     }
@@ -91,12 +93,13 @@ public abstract class AbstractRefreshablePanel<T> implements RefreshablePanel {
   
   @CalledInAwt
   private void acceptData(final T t) {
-    myDetailsPanel.data(dataToPresentation(t));
+    myDetailsPanel.add(dataToPresentation(t));
+    myDetailsPanel.stopLoading();
   }
 
   @Override
   public JPanel getPanel() {
-    return myDetailsPanel.getPanel();
+    return myDetailsPanel;
   }
 
   private class Loader extends ModalityIgnorantBackgroundableTask {

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

@@ -1,53 +0,0 @@
-/*
- * Copyright 2000-2011 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;
-
-import com.intellij.util.ui.JBUI;
-import com.intellij.vcsUtil.UIVcsUtil;
-
-import javax.swing.*;
-import java.awt.*;
-
-public class DetailsPanel {
-  private CardLayout myLayout;
-  private JPanel myPanel;
-
-  public DetailsPanel() {
-    myPanel = new JPanel();
-    myLayout = new CardLayout();
-    myPanel.setLayout(myLayout);
-    myPanel.add(UIVcsUtil.errorPanel("Loading...", false), Layer.loading.name());
-    myPanel.add(JBUI.Panels.simplePanel(), Layer.data.name());
-  }
-
-  public void loading() {
-    myLayout.show(myPanel, Layer.loading.name());
-  }
-
-  public void data(JPanel panel) {
-    myPanel.add(panel, Layer.data.name());
-    myLayout.show(myPanel, Layer.data.name());
-  }
-
-  private enum Layer {
-    loading,
-    data,
-  }
-
-  public JPanel getPanel() {
-    return myPanel;
-  }
-}