Data Access Worldwide Knowledge Base
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QUESTION:
I have the need for a tri-state checkbox in my applications. How do I create this?
ANSWER:
DataFlex has no built-in support for tri-state checkboxes but it is quite easy to make one. The enclosed class (cTriStateBox) supports 3 states (CHECKED, UNCHECKED and INDETERMINATE). You can add the class to your workspace or library and register it in your Visual DataFlex 12 classlist. By doing the latter, you can drag and drop the class from the palette to a component. At designtime the tristate box shows as a checkbox.
With this class you can create code like:
Object oTriStateBox is a cTristateBox
Set Location to 16 14
Set Label to "Voila"
Set CurrentStatus To BST_INDETERMINATE
End_Object
And you can either directly change the current status or send NextStatus. This circles through the 3 states. It is also sent by clicking with the mouse on the box or its label or by pressing the space bar.
The label can be placed on the right hand side of the box (default) or on the left hand side. This setting is a designtime setting only.
Object oTriStateBox is a cTristateBox
Set Location to 16 14
Set Label to "Voila"
Set CurrentStatus To BST_INDETERMINATE
Set piAlignmentMode to taLeftJustify
End_Object
When the state of the box changes an OnChange event message is sent. Do NOT change the state inside this method!
Contributed By:
Vincent Oorsprong
Company: Data Access Worldwide
email: vincent.oorsprong@dataaccess.eu
Web Site: http://www.dataaccess.eu
Web Links Related to this Article
File cTriStateBox.pkg
URL=http://www.dataaccess.com/KBasePublic/Files/2334.cTriStateBox.pkg
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