private void buildLessonTree(Response response) {
TreeItem item = null;
JsArray<LessonCategoryJS> lessonJSArray = JsonUtils.safeEval(response.getText());
for (int i = 0; i < lessonJSArray.length(); i++) {
LessonCategoryJS lessonCategoryJS = lessonJSArray.get(i);
TreeItem category = new TreeItem();
category.setText(lessonCategoryJS.getName());
JsArray<LessonJS> lessons = lessonCategoryJS.getChildren();
for (int j = 0; j < lessons.length(); j++) {
LessonJS lesson = lessons.get(j);
TreeItem lessonItem = new TreeItem();
Storage sessionStorage = Storage.getSessionStorageIfSupported();
String lastUrl = sessionStorage.getItem("lastUrl");
lessonItem.setText(lesson.getText());
category.addItem(lessonItem);
lessonsTreeMap.put(lessonItem.getText(), lesson);
if (lesson.getTechnology().equals(LessonTechnology.GWT.toString())) {
addLessonToMap(lesson);
}
if (lastUrl != null && lastUrl.equals(lesson.getUrl())) {
item = lessonItem;
lessonPanel.setSelectedLesson(lesson);
category.setState(true);
}
}
lessonTree.addItem(category);
}
lessonTree.setSelectedItem(item);
}
private void initLessonTree() {
lessonTree.addSelectionHandler(
new SelectionHandler<TreeItem>() {
@Override
public void onSelection(SelectionEvent<TreeItem> event) {
TreeItem selectedItem = event.getSelectedItem();
TreeItem parentItem = selectedItem.getParentItem();
if (parentItem == null) {
boolean opened = selectedItem.getState();
selectedItem.setState(!opened);
} else {
String text = selectedItem.getText();
LessonJS lessonJS = lessonsTreeMap.get(text);
if (lessonJS != null) {
Storage sessionStorage = Storage.getSessionStorageIfSupported();
String url = lessonJS.getUrl();
if (!lessonJS.getTechnology().equals(LessonTechnology.GWT.toString())) {
sessionStorage.setItem("lastUrl", url);
sessionStorage.setItem("select", Boolean.toString(true));
Window.Location.replace(url);
} else {
lessonPanel.setSelectedLesson(lessonJS);
}
}
}
}
});
}