Page Up與Page Down專利

Microsoft在2008.8.19.獲得Page Up與Page Down專利，該專利是「以頁面為計算基礎之頁數瀏覽」的專利，描述「一種文件閱覽者捲動文件中實質上的精確增額，如一頁，不論目前被閱覽的部分是一頁之全部或部分的方法和系統」。 以下分享該專利摘要，有興趣的讀者請自行至USPTO下載全文。

US7,415,666
Title：Method and system for navigating paginated content in page-based increments Abstract：
A method and system in a document viewer for scrolling a substantially exact increment in a document, such as one page, regardless of whether the zoom is such that some, all or one page is currently being viewed. In one implementation, pressing a Page Down or Page Up keyboard key/button allows a user to begin at any starting vertical location within a page, and navigate to that same location on the next or previous page. For example, if a user is viewing a page starting in a viewing area from the middle of that page and ending at the bottom, a Page Down command will cause the next page to be shown in the viewing area starting at the middle of the next page and ending at the bottom of the next page. Similar behavior occurs when there is more than one column of pages being displayed in a row.