GUI enabling/disabling of controls: Difference between revisions
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{{task|GUI}} {{requires|Graphics}}
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{{omit from|Applesoft BASIC|no concept of a GUI}}▼
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{{omit from|GUISS|Can only do what the installed applications can do}}▼
{{omit from|Integer BASIC|no concept of a GUI}}▼
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In addition to fundamental [[GUI component interaction]], an application should
dynamically enable and disable GUI components, to give some guidance to the
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of the application.
The task: Similar to the task [[GUI component interaction]] write a program
that presents a form with three components to the user:
A numeric input field ("Value") and two buttons ("increment" and "decrement").
The field is initialized to zero.
The user may manually enter a new value into the field,
increment its value with the "
or decrement the value with the "decrement" button.
The input field should be enabled only when its value is zero.
The "increment" button only as long as the field's value is less then 10:
When the value 10 is reached, the button should go into a disabled state.
Analogously, the "decrement" button should be enabled only as long as
the value is greater than zero.
Effectively, the user can now either increment up to 10, or down to zero.
Manually entering values outside that range is still legal,
but the buttons should reflect that and enable/disable accordingly.
=={{header|Ada}}==
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SYS "SetDlgItemInt", !form%, 101, number% - 1, 1
ENDPROC</lang>
{{out}}
<p>
[[File:Guienabbc.gif]]
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=={{header|Scala}}==
<lang Scala>import swing.{ BoxPanel, Button, GridPanel, Orientation, Swing, TextField }
import swing.event.{ ButtonClicked, Key, KeyPressed, KeyTyped }
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updateEnables; # Force initial state of buttons</lang>
▲{{omit from|PARI/GP}}
▲{{omit from|Retro}}
=={{header|Visual Basic}}==
In VB, windows are usually created in the IDE.
The generated code is hidden from the user unless viewed outside of VB.
For the sake of this task, I have included that code.
(Also, this sort of task would typically be performed
by a "spinner" or "up-down" control, not by buttons.)
<lang vb>VERSION 5.00
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End Select
End Sub</lang>
▲{{omit from|ACL2}}
▲{{omit from|Applesoft BASIC|no concept of a GUI}}
▲{{omit from|AWK|no concept of a GUI}}
▲{{omit from|Batch File}}
▲{{omit from|Blast}}
▲{{omit from|Brainf***}}
▲{{omit from|GUISS|Can only do what the installed applications can do}}
▲{{omit from|Integer BASIC|no concept of a GUI}}
▲{{omit from|Lilypond}}
▲{{omit from|Logtalk}}
▲{{omit from|Lotus 123}}
▲{{omit from|Maxima}}
▲{{omit from|PostScript}}
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