Merge "Do not crash when trying to select unselectable items with keyboard." into nyc-dev

                // Handle range selection adjustments. Extending the selection will adjust the

                // bounds of the in-progress range selection. Each time an unshifted navigation

                // event is received, the range selection is restarted.

                if (shouldExtendSelection(event)) {

                if (shouldExtendSelection(doc, event)) {

                    if (!mSelectionManager.isRangeSelectionActive()) {

                        // Start a range selection if one isn't active

                        mSelectionManager.startRangeSelection(doc.getAdapterPosition());

            return false;

        }

        private boolean shouldExtendSelection(KeyEvent event) {

            return Events.isNavigationKeyCode(event.getKeyCode()) &&

                    event.isShiftPressed();

        private boolean shouldExtendSelection(DocumentHolder doc, KeyEvent event) {

            if (!Events.isNavigationKeyCode(event.getKeyCode()) || !event.isShiftPressed()) {

                return false;

            }

            // TODO: Combine this method with onBeforeItemStateChange, as both of them are almost

            // the same, and responsible for the same thing (whether to select or not).

            final Cursor cursor = mModel.getItem(doc.modelId);

            if (cursor == null) {

                Log.w(TAG, "Couldn't obtain cursor for modelId: " + doc.modelId);

                return false;

            }

            final String docMimeType = getCursorString(cursor, Document.COLUMN_MIME_TYPE);

            final int docFlags = getCursorInt(cursor, Document.COLUMN_FLAGS);

            return mTuner.canSelectType(docMimeType, docFlags);

        }

    }