Before (Property)

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WLanguage

WLanguage properties

Various properties

Before

Presentation

Example

See also

Before (Property)

In french: Avant

The Before property replaces or inserts a procedure before the other procedures in:

a variable of type Procedure.
an event associated with a control.

Example

p is procedure
p = MyProcedure
p.After = MyProcedureCalledAfter
p.Before = MyProcedureCalledBefore

// The order for calling the procedures will be:
// - MyProcedureCalledBefore
// - MyProcedure
// - MyProcedureCalledAfter
p()

// Specify the event to run on a click
BTN_BUTTON1.Process[trtClick] = myProcedure1

// Add a procedure to run on a click
BTN_BUTTON1.Process[trtClick] += myProcedure2

// Add a procedure to run before the click process
BTN_BUTTON1.Process[trtClick].Before += myProcedure3

Syntax

Replacing existing procedures with the Before property (= operator) Hide the details

<Element>.Before = <WLanguage procedure>

<Element>: Character string

Element to use:
Name of a variable of type Procedure.
Event of a control. The events of a control can be handled with the Process property.

<WLanguage procedure>: Procedure name

Name of the WLanguage procedure that will replace the existing procedures.

Inserting a procedure before the existing procedures (+= operator) Hide the details

<Element>.Before += <WLanguage procedure>

<Element>: Character string

Element to use:
Name of a variable of type Procedure.
Event of a control. The events of a control can be handled with the Process property.

<WLanguage procedure>: Procedure name

Name of the WLanguage procedure to be inserted before the current procedure.

Remarks

Exiting a sequence of procedures

If several procedures are executed in a sequence, this sequence can be interrupted from the code of one of the procedures using SetFocusAndReturnToUserInput.

Example:

// Click on BTN_Button1
BTN_Button2.Process[trtClick].Before += MyProc1
BTN_Button2.Process[trtClick].Before += MyProc2

// Click on BTN_Button2
Trace("Button 2 clicked")

PROCÉDURE MyProc1()
Trace(dbgInfo(dbgProcess))
SetFocusAndReturnToUserInput(MySelf.Name)

PROCÉDURE MyProc2()
Trace(dbgInfo(dbgProcess))