OKCancel (Function)

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Features of the dialog box
Line break in the dialog box
Miscellaneous
Application in the background: Specific case from Android 10

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OKCancel (Function)

In french: OKAnnuler

Displays a message in a standard dialog box that proposes "OK" and "Cancel" and returns the user's choice.

Remarks:

This is a blocking dialog box. To continue running the application, the user must validate one of the buttons.
Versions 25 and later
To avoid blocking the application, use OKCancelAsynchronous.
New in version 25
To avoid blocking the application, use OKCancelAsynchronous.
To avoid blocking the application, use OKCancelAsynchronous.

Versions 15 and later

This function is now available for Android applications.

New in version 15

This function is now available for Android applications.

Versions 17 and later

This function is now available for iPhone/iPad applications.

New in version 17

This function is now available for iPhone/iPad applications.

Versions 21 and later

This function is now available in Universal Windows 10 App mode.

New in version 21

This function is now available in Universal Windows 10 App mode.

Example

// Delete a line with confirmation (yes by default)
IF OKCancel("Delete this record?") THEN
HDelete(CUSTOMER)
END

// Choice used to exit the program
IF OKCancel("Do you want to exit from the program?") = Yes THEN
Close()
END

// Ask to confirm the deletion of the file whose
// name is found in the FILE_NAME variable, with
// positioning on the "No" button in the OKCancel window
IF OKCancel(No, "Delete the file?") THEN
fDelete(FILE_NAME)
END

Syntax

Displaying an OK/Cancel dialog box Hide the details

<Result> = OKCancel([<Selected button>, ] <Text> [, <Line 2> [... [, <Line N>]]])

<Result>: Boolean

Identifies the button selected by the user:
False The "Cancel" button was chosen by the user.
True The "OK" button was chosen by the user.

<Selected button>: Optional boolean

Button selected by default in the dialog box:
No "Cancel" button selected by default.
True
(by default) "OK" button selected by default.

<Text>: Character string

Text to display.

<Line 2>: Optional character string

Text displayed in the following lines.

<Line N>: Optional character string

Text displayed in the following lines.

Remarks

Features of the dialog box

The title of the dialog box corresponds to the title of the current window (or page).
To comply with the system specifications, the title of dialog box is empty by default. To define this title, use NextTitle.
To modify or define the title of dialog box, use NextTitle.

The message is aligned to the left.
The captions of buttons depend on the runtime language of Windows.
The maximum number of characters cannot exceed 4096. If a larger string is passed as parameter, it will be truncated.
The icon displayed (exclamation mark) cannot be modified.

Line break in the dialog box

The CR string (Carriage Return) can be used to force a break to the next line. For example:

IF OKCancel("Caution: you are going to delete this record" + CR + ...
"Do you want to continue?") THEN
HDelete(CUSTOMER)
END

is equivalent to:

IF OKCancel("Caution: this record will be deleted", ...
"Do you want to continue?") THEN
HDelete(CUSTOMER)
END

You also have the ability to use the syntax of multiline strings. For example:

OKCancel(
[
Caution: you are going to delete this record.

Do you want to continue?
])

Miscellaneous

Timers (TimerSys) are not stopped when this function is called.
The text of the buttons is displayed in the system language.
This function must not be used:
- in the event "Resizing" of the window. Otherwise, the application will be locked.
- in the event "Changing the orientation" of the window.
- in the event "Move to the foreground" associated with the project.
  Remark: However, the function can be used in the event "Move to the foreground" of a window.
- in a thread.

Versions 25 and later

Application in the background: Specific case from Android 10

From Android 10, it is no longer possible to open a window when the application is in the background.

OKCancel can open a window. If this function is used while the application is in the background, a fatal error will occur.

Tips:

It is possible to determine if the application is in the background using InBackgroundMode.
If an application needs to interact with the user while it is in the background, the solution is to display a notification (via the Notification type). The application will be brought back to the foreground when the notification is clicked, if the ActivateApplication property is set to True. You can also open a window from the procedure passed to the ActionClick property.

For more details, see Android 10: Behavior of applications in the background.

New in version 25

Application in the background: Specific case from Android 10

From Android 10, it is no longer possible to open a window when the application is in the background.

OKCancel can open a window. If this function is used while the application is in the background, a fatal error will occur.

Tips:

It is possible to determine if the application is in the background using InBackgroundMode.
If an application needs to interact with the user while it is in the background, the solution is to display a notification (via the Notification type). The application will be brought back to the foreground when the notification is clicked, if the ActivateApplication property is set to True. You can also open a window from the procedure passed to the ActionClick property.

For more details, see Android 10: Behavior of applications in the background.

Application in the background: Specific case from Android 10

From Android 10, it is no longer possible to open a window when the application is in the background.

OKCancel can open a window. If this function is used while the application is in the background, a fatal error will occur.

Tips:

It is possible to determine if the application is in the background using InBackgroundMode.
If an application needs to interact with the user while it is in the background, the solution is to display a notification (via the Notification type). The application will be brought back to the foreground when the notification is clicked, if the ActivateApplication property is set to True. You can also open a window from the procedure passed to the ActionClick property.

For more details, see Android 10: Behavior of applications in the background.

Business / UI classification: UI Code

Component: wd270obj.dll