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<< Click to Display Table of Contents >> Navigation: ThinBASIC Modules > UI (User Interface) > CONTROLS > Control Types > Option Control > Option Control Creation > CONTROL ADD OPTION |
Description
Create a new option control (radio button) inside a dialog.
Syntax
hndl = CONTROL ADD OPTION [Name ControlName], hwnd, ctrlID, txt, xPos, yPos, Width, Height [, [Style] [, [ExStyle]]] [[,] CALL CallBack]
Returns
Number
Control window handler.
Parameters
Name |
Type |
Optional |
Meaning |
ControlName |
String |
Yes |
Optional name for the control.
This name must be globally unique, and is used to create a global variable to be used with control name methods and properties. |
hwnd |
Number |
No |
Handle of the dialog containing the control |
ctrlID |
Number |
No |
Control identifier |
txt |
String |
No |
A text expression representing the text you want to assign to the control. |
xPos |
Number |
No |
Horizontal position of the control inside the dialog |
yPos |
Number |
No |
Vertical position of the control inside the dialog |
Width |
Number |
No |
Control width |
Height |
Number |
No |
Control height |
Style |
Number |
Yes |
Primary style of the control. See OPTION Style equates. |
ExStyle |
Number |
Yes |
Extended style of the control. See OPTION ExStyle equates. |
Callback |
Function |
Yes |
Optional name of a Callback Function that receives all %WM_COMMAND and %WM_NOTIFY messages for the control.
If a callback for the control is not designated, you must create a dialog Callback Function to process messages from your control.
If the Callback Function processes a message, it should return %TRUE (non-zero) to prevent the message being passed unnecessarily to the dialog callback (if one exists). The dialog callback should also return %TRUE if the notification message is processed by that Callback Function. |
Remarks
Notification messages are sent to the Callback Function, with CBMSG = %WM_COMMAND, CBCTL holding the ID (ctrlID) of the control, and CBCTLMSG holding the following values:
%BN_CLICKED Sent when the user clicks a mouse button, or activates the button with the hot-key (unless the button has been disabled).
%BN_DISABLE Sent when a button is disabled.
%BN_KILLFOCUS Sent when a button loses the keyboard focus. The button must include the %BS_NOTIFY style.
%BN_SETFOCUS Sent when a button receives the keyboard focus. The button must include the %BS_NOTIFY style.
When a Callback Function receives a %WM_COMMAND message, it should explicitly test the value of CBCTL and CBCTLMSG to guarantee it is responding appropriately to the notification message.
Restrictions
See also
Examples