+ /**
+ * Sets a selection mode that is useful for quick and easy selecting or deselecting of files.
+ * This method is the central authority about enabling or disabling selection mode:
+ * All other classes that want to enable or disable selection mode should trigger a call of this method.
+ *
+ * This method sets the selection mode for the view of this viewContainer and sets the visibility of the
+ * selection mode top and bottom bar which also belong to this viewContainer.
+ *
+ * @param enabled Whether to enable or disable selection mode.
+ * @param actionCollection The collection of actions from which the actions on the bottom bar are retrieved.
+ * @param bottomBarContents The contents the bar is supposed to show after this call.
+ */