From 4033812f9e8e191808e811cbde98042100ce37ae Mon Sep 17 00:00:00 2001
From: "Liana.Bakradze" <liana.bakradze@jetbrains.com>
Date: Thu, 29 Sep 2016 14:57:28 +0300
Subject: [PATCH] show preview for subtasks

---
 .../edu/coursecreator/actions/CCShowPreview.java         | 4 +++-
 .../src/com/jetbrains/edu/learning/core/EduUtils.java    | 9 +++++++++
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/python/educational-core/course-creator/src/com/jetbrains/edu/coursecreator/actions/CCShowPreview.java b/python/educational-core/course-creator/src/com/jetbrains/edu/coursecreator/actions/CCShowPreview.java
index ef6b7a6c960c..d4185c7e6a4d 100644
--- a/python/educational-core/course-creator/src/com/jetbrains/edu/coursecreator/actions/CCShowPreview.java
+++ b/python/educational-core/course-creator/src/com/jetbrains/edu/coursecreator/actions/CCShowPreview.java
@@ -52,6 +52,7 @@ import javax.swing.border.EmptyBorder;
 import java.awt.*;
 import java.text.SimpleDateFormat;
 import java.util.Calendar;
+import java.util.Collections;
 
 public class CCShowPreview extends DumbAwareAction {
   public static final String SHOW_PREVIEW = "Show Preview";
@@ -147,7 +148,8 @@ public class CCShowPreview extends DumbAwareAction {
       }
     });
     for (AnswerPlaceholder answerPlaceholder : taskFile.getActivePlaceholders()) {
-      answerPlaceholder.setUseLength(true);
+      Integer minIndex = Collections.min(answerPlaceholder.getSubtaskInfos().keySet());
+      answerPlaceholder.setUseLength(minIndex >= answerPlaceholder.getActiveSubtaskIndex());
       EduAnswerPlaceholderPainter.drawAnswerPlaceholder(createdEditor, answerPlaceholder, JBColor.BLUE);
     }
     JPanel header = new JPanel();
diff --git a/python/educational-core/student/src/com/jetbrains/edu/learning/core/EduUtils.java b/python/educational-core/student/src/com/jetbrains/edu/learning/core/EduUtils.java
index 6a7bb8c1b3e6..2d225567eba0 100644
--- a/python/educational-core/student/src/com/jetbrains/edu/learning/core/EduUtils.java
+++ b/python/educational-core/student/src/com/jetbrains/edu/learning/core/EduUtils.java
@@ -20,6 +20,7 @@ import com.intellij.openapi.vfs.VfsUtilCore;
 import com.intellij.openapi.vfs.VirtualFile;
 import com.intellij.openapi.vfs.VirtualFileManager;
 import com.intellij.psi.PsiDirectory;
+import com.intellij.util.containers.ContainerUtil;
 import com.jetbrains.edu.learning.StudyUtils;
 import com.jetbrains.edu.learning.courseFormat.*;
 import org.jetbrains.annotations.NonNls;
@@ -164,6 +165,14 @@ public class EduUtils {
     studentDocument.addDocumentListener(listener);
 
     for (AnswerPlaceholder placeholder : taskFile.getActivePlaceholders()) {
+      Set<Integer> indexes = placeholder.getSubtaskInfos().keySet();
+      int activeSubtaskIndex = task.getActiveSubtaskIndex();
+      if (Collections.min(indexes) < activeSubtaskIndex) {
+        Integer max = Collections.max(ContainerUtil.filter(indexes, i -> i < activeSubtaskIndex));
+        String possibleAnswer = placeholder.getSubtaskInfos().get(max).getPossibleAnswer();
+        replaceAnswerPlaceholder(project, studentDocument, placeholder, placeholder.getRealLength(), possibleAnswer);
+        continue;
+      }
       replaceAnswerPlaceholder(project, studentDocument, placeholder, placeholder.getRealLength(), placeholder.getTaskText());
     }
     studentDocument.removeDocumentListener(listener);
-- 
2.23.3