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The graphical control element accordion is a vertically stacked list of items, such as labels or thumbnails. Each item can be "expanded" or "stretched" to reveal the content associated with that item. There can be zero expanded items, exactly one, or more than one item expanded at a time, depending on the configuration. The term stems from the musical accordion in which sections of the bellows can be expanded by pulling outward. A common example of an accordion is the Show/Hide operation of a box region, but extended to have multiple sections in a list. An accordion is similar in purpose to a tabbed interface, a list of items where exactly one item is expanded into a panel (i.e. list items are shortcuts to access separate panels). ==Developer definition== Several buttons or labels are stacked upon one another. At most one of them can be "active". When a button is active the space below the button is used to display a paned window. The pane is usually constrained by the width of labels. When opened it shifts labels under the clicked label down according to the height of that window. Only one button or pane combination can be active at any one time; when a button is selected any other active panes cease to be active and are hidden. The active pane may have scrollbars. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Accordion (GUI)」の詳細全文を読む スポンサード リンク
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