The Contents window displays:
- Knowledge tree (in the middle of the window). If you would like to understand the meaning of individual icons or build your own knowledge tree, read: Building the knowledge tree
- Caption (at the top of the window)
- Toolbar (under the caption)
- Button panel (at the bottom of the window)
Figure: The Contents window displaying the knowledge tree (i.e. the hierarchical structure of elements) of a collection. In SuperMemo 17, each branch shows the number of its descendants in the parentheses. Concepts use their dedicated icon, which can be seen in the root (collection root is always a concept).
The caption shows the name of the collection.
The toolbar features buttons used in most frequent operations on the knowledge tree (visible on the picture)
- Learn (Ctrl+L) - make repetitions for the selected branch and memorize pending elements belonging to the branch
- Add - add a new element as a child of the currently selected element. The type of the added child element, whether is going to be an item or a topic, is determined by the current selection in the Element type combo box on the right. In the picture, the selected type is Topics. This means that if you click Add you are going to add a topic child element.
- Insert (Ins) - insert a new element in the place of the currently selected element (the current element moves one position down)
- Accept (Enter) - accept the choice of the currently selected element. This button is active only if another option in SuperMemo requires selecting an element in the knowledge tree. In such a case, the Contents window is opened and you can point to the element of interest and click Accept). For example, choosing Links : Hyperlink on the component menu will open the Contents window and ask for selecting an element to link to. Similarly, Shift+Ctrl+V in the element window will ask you where the currently displayed element should be moved in the knowledge tree
- View (Shift+Enter) - view the currently selected element in the element window
- Delete (Del) - delete the currently selected element and all its children (if any)
- Element type combo box - select the default type of elements added to the knowledge tree. If you choose Topics, the button Add will keep adding topics. Items will add items.