Control (Type of variable)

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Controls, pages and windows

Functions for managing controls

Control

Presentation

Example

Declaring a Control variable

Assigning a Control variable

Using a Control variable in a procedure

Optimizing the processes with indirection

Properties associated with a Control variable

Functions that handle a Control variable

ControlExecuteClosing

ControlExecuteModification

CoordinateEditorToScreen

CoordinateScreenToEditor

Functions for managing controls

Declaring a Control variable
Assigning a Control variable
Using a Control variable in a procedure
Optimizing the processes with indirection
Properties associated with a Control variable
Functions that handle a Control variable

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See also

Control (Type of variable)

In french: Champ

The Control type is used to define the characteristics of a control. This control can be dynamically created by ControlCreate or it can be a control found in a window or in a report.

Note: See Declaring a variable for more details.

Example

Remarks

Declaring a Control variable

The following syntax is used to declare a Control variable:

<Variable Name> is Control

Assigning a Control variable

A Control variable can be used to handle:

a control found in a window or in a report.

The assignment of a Control variable must be performed by the '<-' operator.

Examples:

// Assignment with an existing control
c is Control
c <- EDT_Edit1

// Assignment by using the indirection
// The variable references the EDT_EDIT2 control
c <- {"EDT_EDIT2"}

Caution: The '=' operator must not be used to assign a Control variable. This operator is used to transfer the value of a control into another control of the same type. For example:

// Assignment with an existing control
c is Control
c <- EDT_Edit1

// Modify the value
c = EDT_Edit3 // Equivalent code: EDT_Edit1..Value = EDT_Edit3..Value

c = "Text" // Equivalent code: EDT_Edit1..Value = "Text"

Note: To find out whether the Control variable was assigned, use ..Type on the variable.

Using a Control variable in a procedure

The Control type can be a parameter of a procedure. You can write for example:

the code of the procedure:

PROCÉDURE MyProcedure(C is Control)
C = "It is " + TimeSys()
the call to the procedure:

MyProcedure(EDT_Edit1)

Optimizing the processes with indirection

The Control type can be used to optimize the processes that use the indirections. You can write for example:

C is Control <-{s, indControl}
C..Width = 10
C..Height = 20

rather than the following code:

{s, indControl}..Width = 10
{s, indControl}..Height = 20

Properties associated with a Control variable

The Control type is used to handle all types of controls found in a window or in a report. The available properties depend on the type of control used.

Therefore, if a Control variable is used to handle an edit control, all the WLanguage properties available for the edit control will be usable on the Control variable.

To find out the properties of a control, see the help page of control: the "See Also" link is used to access all the control properties. See Window controls for more details.

Functions that handle a Control variable

All the WLanguage functions that handle the controls can be used on a Control variable. However, only the WLanguage functions corresponding to the type of control used will be available.

Therefore, the TableXXX functions can be used on a Control variable that handles a Table control.