[shelf]: rename and convert to interface DiffPreviewUpdateProcessor

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

@@ -16,6 +16,7 @@
 package com.intellij.openapi.vcs.changes;
 
 import com.intellij.diff.chains.DiffRequestProducerException;
+import com.intellij.diff.impl.CacheDiffRequestProcessor;
 import com.intellij.diff.requests.DiffRequest;
 import com.intellij.diff.requests.ErrorDiffRequest;
 import com.intellij.diff.requests.LoadingDiffRequest;
@@ -31,7 +32,8 @@ import org.jetbrains.annotations.Nullable;
 
 import java.util.List;
 
-public abstract class CacheChangeProcessor extends CacheDiffRefreshableRequestProcessor<CacheChangeProcessor.ChangeWrapper> {
+public abstract class CacheChangeProcessor extends CacheDiffRequestProcessor<CacheChangeProcessor.ChangeWrapper>
+  implements DiffPreviewUpdateProcessor {
 
   @Nullable private Change myCurrentChange;
 

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

@@ -15,31 +15,25 @@
  */
 package com.intellij.openapi.vcs.changes;
 
-import com.intellij.diff.impl.CacheDiffRequestProcessor;
-import com.intellij.openapi.project.Project;
 import org.jetbrains.annotations.CalledInAwt;
 import org.jetbrains.annotations.NotNull;
-import org.jetbrains.annotations.Nullable;
 
-public abstract class CacheDiffRefreshableRequestProcessor<T> extends CacheDiffRequestProcessor<T> {
-  public CacheDiffRefreshableRequestProcessor(@Nullable Project project) {
-    super(project);
-  }
-
-  public CacheDiffRefreshableRequestProcessor(@Nullable Project project, @NotNull String place) {
-    super(project, place);
-  }
+import javax.swing.*;
 
+public interface DiffPreviewUpdateProcessor {
   /**
    * Notify currently shown diff that it's not needed now and cached values can be reset, a.e. before hiding preview panel
    */
   @CalledInAwt
-  public abstract void clear();
+  void clear();
 
   /**
    * Get newly requested element for diff and update/create new diff request for it
    * a.e. get selection from some model and check if previously shown diff request need to be replaced or still valid for such selection
    */
   @CalledInAwt
-  public abstract void refresh();
+  void refresh();
+
+  @NotNull
+  JComponent getComponent();
 }

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

@@ -24,11 +24,11 @@ import javax.swing.*;
 
 public class PreviewDiffSplitterComponent extends JBSplitter {
   @NotNull private final JComponent myFirstComponent;
-  @NotNull private final CacheDiffRefreshableRequestProcessor myProcessor;
+  @NotNull private final DiffPreviewUpdateProcessor myProcessor;
   private boolean myDetailsOn;
 
   public PreviewDiffSplitterComponent(@NotNull JComponent firstComponent,
-                                      @NotNull CacheDiffRefreshableRequestProcessor processor,
+                                      @NotNull DiffPreviewUpdateProcessor processor,
                                       @NotNull String splitterDimensionKey, boolean detailsOn) {
     super(splitterDimensionKey, 0.5f);
     myFirstComponent = firstComponent;

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

@@ -19,6 +19,7 @@ package com.intellij.openapi.vcs.changes.shelf;
 import com.intellij.CommonBundle;
 import com.intellij.diff.DiffContentFactoryEx;
 import com.intellij.diff.chains.DiffRequestProducerException;
+import com.intellij.diff.impl.CacheDiffRequestProcessor;
 import com.intellij.diff.requests.DiffRequest;
 import com.intellij.diff.requests.SimpleDiffRequest;
 import com.intellij.icons.AllIcons;
@@ -741,7 +742,7 @@ public class ShelvedChangesViewManager implements ProjectComponent {
     return new DnDImage(image, new Point(-image.getWidth(null), -image.getHeight(null)));
   }
 
-  private class MyShelvedPreviewProcessor extends CacheDiffRefreshableRequestProcessor<ShelvedWrapper> {
+  private class MyShelvedPreviewProcessor extends CacheDiffRequestProcessor<ShelvedWrapper> implements DiffPreviewUpdateProcessor {
 
     @NotNull private final DiffShelvedChangesAction.PatchesPreloader myPreloader;
     @Nullable private ShelvedWrapper myCurrentShelvedElement;