Combination (Type of variable)

WINDEV, WEBDEV AND WINDEV MOBILE
ONLINE HELP

Version:

Home | Sign in | English

Declaring the combinations
Enabling or disabling the options of a combination
Reading the combination options
Passing a combination in parameter to a procedure
Assisted input
Extension of combination
Preset combinations
Mutual exclusions
Associated properties
Available WLanguage functions
Limits

WINDEV

WEBDEV

WINDEV Mobile

Others

See also

Combination (Type of variable)

In french: Combinaison

A combination is a set of options. A combination variable or a combination parameter can be assigned with none, one or more combination options.

Versions 21 and later

The Combination type is now available for the applications in Universal Windows 10 App mode.

The Combination type is now available in Apple Watch mode.

New in version 21

The Combination type is now available for the applications in Universal Windows 10 App mode.

The Combination type is now available in Apple Watch mode.

The Combination type is now available for the applications in Universal Windows 10 App mode.

The Combination type is now available in Apple Watch mode.

Versions 22 and later

The Combination type is now available in browser code.

New in version 22

The Combination type is now available in browser code.

Versions 23 and later

This Combination type is now available for the Java applications.

The Combination type is now available in Android Widget mode.

The Combination type is now available for the Android applications.

New in version 23

This Combination type is now available for the Java applications.

The Combination type is now available in Android Widget mode.

The Combination type is now available for the Android applications.

This Combination type is now available for the Java applications.

The Combination type is now available in Android Widget mode.

The Combination type is now available for the Android applications.

Example

// Declaration code
// Declare a combination
CombinationType is Combination
CreateFile
ReadFile
WriteFile
DeleteFile
END

// Declare a Combination variable
FileAction is CombinationType
// Assign the variable
FileAction = ReadFile + WriteFile
// FileAction = 0 // Disables all the options

Syntax

Declaring a combination Hide the details

<Combination name> is Combination
<Combination options>
END

<Combination name>:

Name of combination to declare

<Combination options>:

Different options that can be taken by the combination.

<END>:

End of declaration.

Declaring a Combination variable Hide the details

<Variable name>:

Name of Combination variable to declare.

<Combination name>:

Name of combination that was declared beforehand.

Remarks

Declaring the combinations

A combination must be declared in:

The initialization code of project in order to be used in all the processes of the project (code of project, code of windows, code of controls, procedures, etc.).
The declaration code of global variables of a window in order to be used in all the processes of the window (code of window, code of controls found in the window, local procedures, etc.).
The opening code of a report in order to be used in all the processes of the report (code of the report, code of controls found in the report, local procedures, etc.).
The declaration code of a class in order to be used in the class.
- To access this combination from a method of the class, use the syntax "::<Combination name>".
- To access this combination from a code external to the class, use the syntax "<Class name>::<Combination name>".
The declaration code of sets of procedures in order to be used in all the procedures of the set.

Note: A combination is always global:

to a project,
with a window,
to a report,
to a class.

Enabling or disabling the options of a combination

Several syntaxes can be used to enable or disable the options of a combination. Some examples:

Declaring the combination used for the examples:

CombinationType is Combination
CreateFile
ReadFile
WriteFile
DeleteFile
END

// Declare a Combination variable
FileAction is CombinationType
Disabling all the options:
Syntax:

<Combination Variable> = 0

Example:

FileAction = 0
Enabling one or more options:
Syntax:

<Combination Variable> = Option 1
<Combination Variable>[Option 1] = True

<Combination Variable> = Option 1 + Option 2
<Combination Variable>[Option 1 + Option 2] = True

Examples:

FileAction = ReadFile // Enables an option
FileAction = ReadFile + WriteFile // Enables 2 options

FileAction[ReadFile] = True // Enables an option
FileAction[ReadFile + WriteFile] = True // Enables 2 options
Disabling one or more options:
Syntax:

<Combination Variable>[Option 1] = False

<Combination Variable>[Option 1 + Option 2] = False

Examples:

FileAction[ReadFile] = False // Disables an option
FileAction[ReadFile + WriteFile] = False // Disables 2 options

Reading the combination options

Several syntaxes can be used to find out the combination options. Some examples:

Declaring the combination

CombinationType is Combination
CreateFile
ReadFile
WriteFile
DeleteFile
END

// Declare a Combination variable
FileAction is CombinationType
Check whether all the options are disabled:
Syntax:

IF <Combination Variable> = 0

Examples:

IF FileAction = 0 THEN...
Check whether an option is enabled:
Syntax:

IF <Combination Variable> = Option 1 ...
IF <Combination Variable>[Option 1] = True...

Examples:

IF FileAction = ReadFile THEN ...
IF FileAction[ReadFile] = True THEN...
Check whether several options are enabled:
Syntax:

IF <Combination Variable> = Option 1 + Option 2 THEN ...
IF <Combination variable>[Option 1 + Option 2] = True ...

Examples:

IF FileAction = ReadFile + WriteFile THEN ...
IF FileAction[ReadFile + WriteFile] = True THEN...
Check whether at least one option is enabled:
Syntax:

IF <Combination Variable>[Option 1] OR <Combination Variable>[Option 2] THEN...

Examples:

IF FileAction[ReadFile] OR FileAction[WriteFile] THEN...

Passing a combination in parameter to a procedure

A Combination variable can be passed in parameter to a procedure. To do so, use the following syntax:

<Procedure name>(<Name of combination variable>)

For example:

// Procedure with a Combination parameter
PROCEDURE FileType(p is CombinationType)

// Calls with a Combination parameter
FileType(ReadFile + WriteFile)
FileType(FileAction)

Assisted input

The assisted input for a Combination parameter proposes the different combination options.

Extension of combination

A combination can extend the values of one or more other combinations by taking the options of this ones and by adding new options.

The following syntax is used:

<Combination name> is Combination
[Base Combination]
<Combination additional options>
END

where:

<Combination name>: Name of combination that was declared beforehand.
Base Combination: Name of base combination to use.
<Combination additional options>: Additional options that will be taken into account in the combination.

Example:

CombinationType is Combination
CreateFile
ReadFile
WriteFile
DeleteFile
END

AdvancedCombinationType is Combination
[CombinationType]
OtherAttributes
END

Preset combinations

Several options can be combined to force a preset combination. The combined options must belong to the combination (or to base combinations)

The following syntax is used:

<Combination name> is Combination
<Option 1 of combination>
<Option 2 of combination>
<Option 3 of combination> = <Option 1 of combination> + <Option 2 of combination>
END

Example:

CombinationType is Combination
CreateFile
ReadFile
WriteFile
DeleteFile
Read_Write_File = ReadFile + WriteFile
END

Mutual exclusions

You have the ability to describe mutual exclusions between the combination options.

For example, a combination contains three options: Option1, Option2 and Option3. Option2 and Option3 are exclusive:

Option1 and Option2 can be active.
Option1 and Option3 can be active.
Option2 and Option3 cannot be enabled.
Option1, Option2 and Option3 cannot be active.

The following syntax must be used:

<Combination name> is Combination
<Option 1 of combination>
<Option 2 of combination>
<Option 3 of combination>
// Exclusions
<Option 2 of combination> - <Option 3 of combination>
END

Note: By combining the extensions and the exclusions, you have the ability to get for the same options:

a parameter of a function that imposes an exclusion,
a parameter of a function that imposes no exclusion or that imposes a different exclusion.

Associated properties

The following properties are associated with the Combination variables:


Name	Used to find out the name of a Combination variable.
Value	Used to find out the associated value of a Combination variable.

Versions 19 and later

Available WLanguage functions

A combination can be stored in a HFSQL item or in another file format. Depending on your requirements, you can store the combination name (..Name) or value (..Value).

The following WLanguage functions allow you to get the characteristics of a stored combination:


Versions 19 and later CombinationCheckName New in version 19 CombinationCheckName CombinationCheckName	Checks whether a combination of one of more options known by their names is valid.
Versions 19 and later CombinationFromName New in version 19 CombinationFromName CombinationFromName	Returns a combination of one or more options known by their names.
Versions 19 and later CombinationFromValue New in version 19 CombinationFromValue CombinationFromValue	Returns a combination of one or more options known by their associated values.

New in version 19

Available WLanguage functions

A combination can be stored in a HFSQL item or in another file format. Depending on your requirements, you can store the combination name (..Name) or value (..Value).

The following WLanguage functions allow you to get the characteristics of a stored combination:


Versions 19 and later CombinationCheckName New in version 19 CombinationCheckName CombinationCheckName	Checks whether a combination of one of more options known by their names is valid.
Versions 19 and later CombinationFromName New in version 19 CombinationFromName CombinationFromName	Returns a combination of one or more options known by their names.
Versions 19 and later CombinationFromValue New in version 19 CombinationFromValue CombinationFromValue	Returns a combination of one or more options known by their associated values.

Available WLanguage functions

A combination can be stored in a HFSQL item or in another file format. Depending on your requirements, you can store the combination name (..Name) or value (..Value).

The following WLanguage functions allow you to get the characteristics of a stored combination:


Versions 19 and later CombinationCheckName New in version 19 CombinationCheckName CombinationCheckName	Checks whether a combination of one of more options known by their names is valid.
Versions 19 and later CombinationFromName New in version 19 CombinationFromName CombinationFromName	Returns a combination of one or more options known by their names.
Versions 19 and later CombinationFromValue New in version 19 CombinationFromValue CombinationFromValue	Returns a combination of one or more options known by their associated values.

Limits

The combinations are not available in dynamic compilation.