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Motif and CDE 2.1 Style Guide Reference
Scrolling is a technique that allows the user to interact with data that is
too large to be viewed or edited in the provided window.
When to Use
RecommendedWhen a control does not have a scrolling element associated with it, such
as a scroll bar, do not allow it to be scrolled.
OptionalIf the contents of a control indicates that additional elements exist
beyond the bounds of the visible area (such as in text), allow the user to
scroll the control through keyboard operations or autoscrolling even if the
area does not have an associated scrolling element.
RequiredMake the unit scrolling increments (for example, the smallest amount a
scrolled area can be scrolled when using an associated scroll bar) equal to
those shown in Table 23.
Table 23. Scrolling Increments
|Type of Element
||Unit Scrolling Increment|
||Width of em (M) character
||Bottom of one line to bottom of next line|
|Icons or controls
||Width of smallest icon or control
||Height of smallest icon or control|
||Five percent of the width of the view, or by units of a scale specified
by the user
||Five percent of the height of the view, or by units of a scale specified
by the user|
RecommendedMake the page scrolling increment (for example, the amount by which an
area is scrolled using a paging operation) equal to the width or height of the
scrolled area minus the unit scrolling increment.
RecommendedDefine a medium scrolling increment that is larger than the unit scrolling
increment and smaller than a paging increment.
RecommendedIf a horizontally scrollable area does not support horizontal navigation
Allow < and > to scroll left and right one scrolling
Allow Ctrl < and Ctrl > to scroll left and right one medium
scrolling increment, respectively.
Allow Home (or Begin) and End to scroll to the left and right ends of the
RecommendedIf a vertically scrollable area does not support vertical navigation
Allow ^ and V to scroll up and down one scrolling increment,
Allow Ctrl ^ and Ctrl V to scroll up and down one medium
scrolling increment, respectively.
Allow Ctrl Home (or Ctrl Begin) and Ctrl End to scroll to the top and
bottom ends of the data, respectively.
RequiredWhen the user presses PageUp or PageDown and focus is on a scrollable
area, scroll up or down by one page.
RequiredWhen the user presses PageLeft (or Ctrl PageUp) or PageRight (or Ctrl
PageDown) and focus is on a scrollable area, scroll left or right by one page.
RequiredWhen the user is using the paging keys to scroll (and ScrollLock is not
used), move the active cursor within the scrollable area so that it is
visible, unless the cursor cannot be placed in the visible area after
RequiredPaging keys should apply to the most deeply nested appropriate scrollable
area that contains the active cursor.
RequiredIf a scrolled control (for example, a text field) maintains a cursor
location even when it does not have focus, then when keyboard navigation is
used to move focus to that control, scroll it, if necessary, so that the
cursor location is visible.
RequiredWhen the user navigates to an element within a scrollable area, scroll the
area so that the element is visible.
RequiredWhen any keyboard operation moves the cursor within a scrolled control, or
inserts, deletes, or modifies elements at the cursor position, scroll the
control so that the cursor is visible when the operation is complete.
RequiredDesign navigation operations to traverse through an entire scrollable
area, not just the visible portion of it.
If the user can change the size of a scrollable control or area, and the
cursor is visible in that area, scroll it so that the cursor remains visible.
RequiredWhen the user scrolls with a mouse, do not move the cursor in the
underlying data; instead, allow it to be scrolled outside of the visible area.
RequiredIf the active cursor is within a scrolled area, but is not visible,
indicate focus emphasis by placing an element cursor on the entire scrolled
RecommendedIf focus is within a scrolled area and the user presses a navigation or
paging key, augmented with ScrollLock, scroll the area as if the key were
interpreted by a scroll bar (even if there is none). The active cursor should
remain where it is, even if it is scrolled outside of the visible area.
RequiredWhen the user presses Cancel (or Esc), cancel the mouse-based scrolling
action and return the scrolling area to its position prior to the start of the
RecommendedWhen the user scrolls with the mouse, continually update the information
in the scrolled area as the mouse is moved.
RecommendedIf it is not possible to continually update information as it is being
scrolled, update the information in the scrolling area when the user pauses
RecommendedWhen the user scrolls with the mouse, make the scrolling area appear to
move smoothly by scrolling it in small increments.
RequiredWhen a mouse-based selection operation is in progress within a control
that supports scrolling and the user moves the pointer outside of the control,
scroll towards the pointer. This is called "selection autoscrolling."
RecommendedWhen the user pauses (for a time that the user can set) during a
drag-and-drop operation, at the edge of a scrolled area, scroll towards that
edge. This is called "drag autoscrolling."
RecommendedWhen a drag-and-drop operation is initiated in a scrolled area and the
elements being dragged are not valid outside that area, perform drag
autoscrolling when the user moves the pointer outside of the area.
Essential Related Topics
For more information, see the Control Navigation and Scroll Bar
(Control) reference pages.
Supplemental Related Topics
For more information, see the Control, Keyboard (Device), and Mouse
(Device) reference pages.
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