Scroll bars

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4D v18

Scroll bars

You can associate scroll bars with several types of objects: Get list item font of the Text or Picture type, hierarchical lists, list boxes and subforms. You can manage these properties using the Property List or via programming using the OBJECT SET SCROLLBAR command.

To associate scroll bars, you use the Horizontal Scroll Bar and Vertical Scroll Bar properties found in the “Appearance” theme of the Property List.

For Picture, hierarchical list and list box type objects, these properties are set by means of a menu and support the automatic mode.
For Text and subform type objects, these properties are set using check boxes.

Note: If a text field or enterable object does not have a scroll bar, the user can scroll the information using the arrow keys.

Scroll bars for pictures

Picture, hierarchical list and list box type objects support scrollbars in automatic mode.

Note: Picture objects can have scrollbars when the display format of the picture is set to “Truncated (non-centered).” For more information about picture display formats, please refer to the “Picture formats” paragraph in GET LIST ITEM PARAMETER.

In this context, the Horizontal Scroll Bar and Vertical Scroll Bar properties are set using a menu with three options:

Yes: The scrollbar is always visible, even when it is not necessary (in other words, when the size of the object contents is smaller than that of the frame).
No: The scrollbar is never visible.
Automatic: The scrollbar appears automatically whenever necessary (in other words, when the size of the object contents is greater than that of the frame).

Scroll keys

Scroll keys are automatically available for users when a picture type object has a scroll bar. The following keys are supported:

Key(s)	Action
Arrow keys	Scrolling in direction of arrow (= click on scroll bar cursor)
Alt + Arrow keys	Pixel-by-pixel scrolling in direction of arrow
Page Up / Page Down	Page-by-page vertical scrolling (related to area height)
Shift + Page Up / Page Down	Page-by-page horizontal scrolling (related to area width)
Home	Display top edge of picture
End	Display bottom edge of picture
Shift + Home	Display left edge of picture
Shift + End	Display right edge of picture
Mouse wheel	Vertical scrolling
Shift + Mouse wheel	Horizontal scrolling

Note that picture scrolling triggers the On Scroll Form event code.