Move: Fix file preview presentation

#KT-8930 Fixed

idea/src/org/jetbrains/kotlin/idea/refactoring/move/moveDeclarations/MoveFilesWithDeclarationsProcessor.kt

@@ -24,6 +24,7 @@ import com.intellij.psi.PsiElement
 import com.intellij.refactoring.move.MoveCallback
 import com.intellij.refactoring.move.moveFilesOrDirectories.MoveFilesOrDirectoriesProcessor
 import com.intellij.usageView.UsageInfo
+import com.intellij.usageView.UsageViewDescriptor
 import com.intellij.usageView.UsageViewUtil
 import com.intellij.util.containers.MultiMap
 import com.intellij.util.text.UniqueNameGenerator
@@ -49,6 +50,10 @@ class MoveFilesWithDeclarationsProcessor(
         return if (targetFileName != null) "Move " + sourceFiles.single().name else "Move"
     }
 
+    override fun createUsageViewDescriptor(usages: Array<out UsageInfo>): UsageViewDescriptor {
+        return MoveFilesWithDeclarationsViewDescriptor(sourceFiles.toTypedArray<PsiElement>(), targetDirectory)
+    }
+
     override fun preprocessUsages(refUsages: Ref<Array<UsageInfo>>): Boolean {
         val usages = refUsages.get()
 

idea/src/org/jetbrains/kotlin/idea/refactoring/move/moveDeclarations/MoveFilesWithDeclarationsViewDescriptor.kt

@@ -0,0 +1,58 @@
+/*
+ * Copyright 2010-2017 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 org.jetbrains.kotlin.idea.refactoring.move.moveDeclarations
+
+import com.intellij.openapi.util.text.StringUtil
+import com.intellij.psi.PsiDirectory
+import com.intellij.psi.PsiElement
+import com.intellij.refactoring.RefactoringBundle
+import com.intellij.usageView.UsageViewBundle
+import com.intellij.usageView.UsageViewDescriptor
+import com.intellij.usageView.UsageViewUtil
+
+internal class MoveFilesWithDeclarationsViewDescriptor(
+        private val myElementsToMove: Array<PsiElement>,
+        newParent: PsiDirectory
+) : UsageViewDescriptor {
+    private var myProcessedElementsHeader: String? = null
+    private val myCodeReferencesText: String
+
+    init {
+        if (myElementsToMove.size == 1) {
+            myProcessedElementsHeader = RefactoringBundle.message("move.single.element.elements.header",
+                                                                  UsageViewUtil.getType(myElementsToMove[0]),
+                                                                  newParent.virtualFile.presentableUrl).capitalize()
+            myCodeReferencesText = "References in code to ${UsageViewUtil.getType(myElementsToMove[0])} ${UsageViewUtil.getLongName(myElementsToMove[0])} and its declarations"
+        }
+        else {
+            myProcessedElementsHeader = StringUtil.capitalize(RefactoringBundle.message("move.files.elements.header", newParent.virtualFile.presentableUrl))
+            myCodeReferencesText = RefactoringBundle.message("references.found.in.code")
+        }
+    }
+
+    override fun getElements() = myElementsToMove
+
+    override fun getProcessedElementsHeader() = myProcessedElementsHeader
+
+    override fun getCodeReferencesText(usagesCount: Int, filesCount: Int): String {
+        return myCodeReferencesText + UsageViewBundle.getReferencesString(usagesCount, filesCount)
+    }
+
+    override fun getCommentReferencesText(usagesCount: Int, filesCount: Int): String? {
+        return RefactoringBundle.message("comments.elements.header", UsageViewBundle.getOccurencesString(usagesCount, filesCount))
+    }
+}