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fix navigation to next/previous task for empty task list

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Ekaterina Tuzova
2017-04-06 14:54:32 +03:00
parent c89c64d8f3
commit 2307d6e64c
1 changed files with 18 additions and 2 deletions
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python/educational-core/src/com/jetbrains/edu/learning/navigation/StudyNavigator.java
+18 -2
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@@ -41,7 +41,15 @@ public class StudyNavigator {
if (nextLesson == null) {
return null;
}
return StudyUtils.getFirst(nextLesson.getTaskList());
List<Task> nextLessonTaskList = nextLesson.getTaskList();
while (nextLessonTaskList.isEmpty()) {
nextLesson = nextLesson(nextLesson);
if (nextLesson == null) {
return null;
}
nextLessonTaskList = nextLesson.getTaskList();
}
return StudyUtils.getFirst(nextLessonTaskList);
}
public static Task previousTask(@NotNull final Task task) {
@@ -55,7 +63,15 @@ public class StudyNavigator {
return null;
}
//getting last task in previous lesson
return prevLesson.getTaskList().get(prevLesson.getTaskList().size() - 1);
List<Task> prevLessonTaskList = prevLesson.getTaskList();
while (prevLessonTaskList.isEmpty()) {
prevLesson = previousLesson(prevLesson);
if (prevLesson == null) {
return null;
}
prevLessonTaskList = prevLesson.getTaskList();
}
return prevLessonTaskList.get(prevLessonTaskList.size() - 1);
}
public static Lesson nextLesson(@NotNull final Lesson lesson) {