1 files changed, 34 insertions, 0 deletions
diff --git a/python/edu/learn-python/src/com/jetbrains/python/edu/actions/StudyPrevWindowAction.java b/python/edu/learn-python/src/com/jetbrains/python/edu/actions/StudyPrevWindowAction.java
new file mode 100644
index 000000000000..347456189a00
--- /dev/null
+++ b/python/edu/learn-python/src/com/jetbrains/python/edu/actions/StudyPrevWindowAction.java
@@ -0,0 +1,34 @@
+package com.jetbrains.python.edu.actions;
+
+import com.jetbrains.python.edu.StudyUtils;
+import com.jetbrains.python.edu.course.TaskWindow;
+import icons.StudyIcons;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.List;
+
+/**
+ * author: liana
+ * data: 6/30/14.
+ */
+public class StudyPrevWindowAction extends StudyWindowNavigationAction {
+  public static final String ACTION_ID = "PrevWindowAction";
+  public static final String SHORTCUT = "ctrl pressed COMMA";
+
+  public StudyPrevWindowAction() {
+    super("PrevWindowAction", "Select previous window", StudyIcons.Prev);
+  }
+
+
+  @Nullable
+  @Override
+  protected TaskWindow getNextTaskWindow(@NotNull final TaskWindow window) {
+    int prevIndex = window.getIndex() - 1;
+    List<TaskWindow> windows = window.getTaskFile().getTaskWindows();
+    if (StudyUtils.indexIsValid(prevIndex, windows)) {
+      return windows.get(prevIndex);
+    }
+    return null;
+  }
+}