[file-history] introduce a data key for refresher

platform/vcs-impl/src/com/intellij/openapi/VcsInternalDataKeys.java

@@ -0,0 +1,9 @@
+// Copyright 2000-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+package com.intellij.openapi;
+
+import com.intellij.openapi.actionSystem.DataKey;
+import com.intellij.openapi.vcs.history.FileHistoryRefresherI;
+
+public interface VcsInternalDataKeys {
+  DataKey<FileHistoryRefresherI> FILE_HISTORY_REFRESHER = DataKey.create("FILE_HISTORY_REFRESHER");
+}

platform/vcs-impl/src/com/intellij/openapi/vcs/history/FileHistoryPanelImpl.java

@@ -18,6 +18,7 @@ package com.intellij.openapi.vcs.history;
 import com.intellij.CommonBundle;
 import com.intellij.icons.AllIcons;
 import com.intellij.ide.CopyProvider;
+import com.intellij.openapi.VcsInternalDataKeys;
 import com.intellij.openapi.actionSystem.*;
 import com.intellij.openapi.application.ApplicationManager;
 import com.intellij.openapi.editor.colors.EditorColorsListener;
@@ -501,6 +502,9 @@ public class FileHistoryPanelImpl extends PanelWithActionsAndCloseButton impleme
         return flatView.getRow(flatView.getSelectedRow() + 1).getRevision();
       }
     }
+    else if (VcsInternalDataKeys.FILE_HISTORY_REFRESHER.is(dataId)) {
+      return myRefresherI;
+    }
     else {
       return super.getData(dataId);
     }
@@ -553,11 +557,6 @@ public class FileHistoryPanelImpl extends PanelWithActionsAndCloseButton impleme
     myDualView.dispose();
   }
 
-  @NotNull
-  public FileHistoryRefresherI getRefresher() {
-    return myRefresherI;
-  }
-
   private void refreshRevisionsOrder() {
     final List<VcsFileRevision> list = myHistorySession.getRevisionList();
     myRevisionsOrder.clear();

platform/vcs-impl/src/com/intellij/openapi/vcs/history/FileHistorySessionPartner.java

@@ -15,6 +15,8 @@
  */
 package com.intellij.openapi.vcs.history;
 
+import com.intellij.openapi.VcsInternalDataKeys;
+import com.intellij.openapi.actionSystem.DataProvider;
 import com.intellij.openapi.application.ApplicationManager;
 import com.intellij.openapi.project.Project;
 import com.intellij.openapi.ui.MessageType;
@@ -88,7 +90,7 @@ public class FileHistorySessionPartner implements VcsHistorySessionConsumer {
     JComponent component = ContentUtilEx.findContentComponent(getToolWindow(project).getContentManager(), comp ->
       comp instanceof FileHistoryPanelImpl &&
       sameHistories((FileHistoryPanelImpl)comp, path, startingRevisionNumber));
-    return component == null ? null : ((FileHistoryPanelImpl)component).getRefresher();
+    return component == null ? null : VcsInternalDataKeys.FILE_HISTORY_REFRESHER.getData((DataProvider)component);
   }
 
   public void acceptRevision(VcsFileRevision revision) {

platform/vcs-impl/src/com/intellij/openapi/vcs/history/actions/RefreshFileHistoryAction.java

@@ -3,11 +3,11 @@ package com.intellij.openapi.vcs.history.actions;
 
 import com.intellij.icons.AllIcons;
 import com.intellij.ide.actions.RefreshAction;
+import com.intellij.openapi.VcsInternalDataKeys;
 import com.intellij.openapi.actionSystem.AnActionEvent;
 import com.intellij.openapi.project.DumbAware;
 import com.intellij.openapi.vcs.VcsBundle;
-import com.intellij.openapi.vcs.VcsDataKeys;
-import com.intellij.openapi.vcs.history.FileHistoryPanelImpl;
+import com.intellij.openapi.vcs.history.FileHistoryRefresherI;
 
 public class RefreshFileHistoryAction extends RefreshAction implements DumbAware {
   public RefreshFileHistoryAction() {
@@ -15,19 +15,19 @@ public class RefreshFileHistoryAction extends RefreshAction implements DumbAware
   }
 
   public void actionPerformed(AnActionEvent e) {
-    FileHistoryPanelImpl panel = (FileHistoryPanelImpl)e.getRequiredData(VcsDataKeys.FILE_HISTORY_PANEL);
-    panel.getRefresher().refresh(false);
+    FileHistoryRefresherI refresher = e.getRequiredData(VcsInternalDataKeys.FILE_HISTORY_REFRESHER);
+    refresher.refresh(false);
   }
 
   @Override
   public void update(AnActionEvent e) {
     super.update(e);
-    FileHistoryPanelImpl panel = (FileHistoryPanelImpl)e.getData(VcsDataKeys.FILE_HISTORY_PANEL);
-    if (panel == null) {
+    FileHistoryRefresherI refresher = e.getData(VcsInternalDataKeys.FILE_HISTORY_REFRESHER);
+    if (refresher == null) {
       e.getPresentation().setEnabledAndVisible(false);
       return;
     }
     e.getPresentation().setVisible(true);
-    e.getPresentation().setEnabled(!panel.getRefresher().isInRefresh());
+    e.getPresentation().setEnabled(!refresher.isInRefresh());
   }
 }