void prevPage() {
            KeyboardPagingPolicy keyboardPagingPolicy = display.getKeyboardPagingPolicy();
            if (KeyboardPagingPolicy.CHANGE_PAGE == keyboardPagingPolicy) {
                // 0th index of previous page.
                setKeyboardSelectedRow(-display.getPageSize());
            } else if (KeyboardPagingPolicy.INCREASE_RANGE == keyboardPagingPolicy) {
                setKeyboardSelectedRow(display.getKeyboardSelectedRow() - PAGE_INCREMENT);
            }
        }
Construct a new keyboard selection handler for the specified view.

@param display the display being handled
stroom-core-client-widget/src/main/java/com/google/gwt/user/cellview/client/AbstractHasData.java