RequestUpdateUI (Function)

ONLINE HELP
WINDEV, WEBDEV AND WINDEV MOBILE

Version:

Home | Sign in | English

Help

WLanguage

WLanguage functions

Controls, pages and windows

Window management functions

RequestUpdateUI

Presentation

Example

"Request for refreshing the display" event

"Presenter" attribute

See also

RequestUpdateUI (Function)

In french: DemandeMiseAJourIHM

Warning
From version 25, this function is kept for backward compatibility. It is recommended to use RequestRefreshUI.

Requests the execution of the "Request for refreshing the display" event (and gives back control without waiting for the execution of the event).

Remarks:

The "Request for refreshing the display" event is available for windows, internal windows, pages, internal pages, control templates and supercontrols.
If this function is called multiple times, all subsequent calls with the same parameters as calls that have not yet been executed are ignored.
If the function is called in main the thread, the "Request for refreshing the display" event will be executed after the current process.
If the function is called in a secondary thread, the "Request for refreshing the display" event will be executed when the window is refreshed.

Uses: This function is mainly used:

when refreshing the interface via threads.
when using MVP (Model - View - Presenter) programming. For more details, see MVP overview: Model - View - Presenter.

Caution: This function is available for the Android applications from version 200066.

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.

Versions 24 and later

This function is now available for WEBDEV sites in Windows.

This function is now available for WEBDEV sites in Linux.

New in version 24

This function is now available for WEBDEV sites in Windows.

This function is now available for WEBDEV sites in Linux.

This function is now available for WEBDEV sites in Windows.

This function is now available for WEBDEV sites in Linux.

Example

// Process records
// The graphic interface will have to be refreshed
RequestRefreshUI()

// ----------------------------------------------------------------
// -- Request for refreshing the display of WIN_Contact_Form
// Refresh the title of the window
MySelf..Title = gpclContactForm.p_sFullname

// Refresh the linked controls of the window
SourceToScreen()

Syntax

RequestUpdateUI([<Parameter 1> [... [, <Parameter N>]]])

<Parameter 1>: Optional parameter corresponding to the type expected by the event "Request for refreshing the display"

First parameter that will be passed to the "Request for refreshing the display" window event.

<Parameter N>: Type of value expected by the "Request for refreshing the display" event

Nth parameter that will be passed to the "Request for refreshing the display" window event.

Remarks

"Request for refreshing the display" event

One of the events associated with the window is "Request for refreshing the display". This event is used to group the code for refreshing the window controls: content of controls, state (visible, grayed, etc.), caption to refresh, etc.

This event can receive parameters. Simply declare a procedure in the event. For example:

// Request for refreshing the display
PROCEDURE AskForRefresh(RefreshType is boolean)

This event is started upon request by the following functions:

RequestUpdateUI: Executes the "Request for refreshing the display" event at the end of the current process (asynchronous execution).
ExecuteUpdateUI: Immediately executes the "Request for refreshing the display" event.
Versions 22 and later
RequestUpdateUIParent: Executes the "Request for refreshing the display" event of the higher level at the end of the current process (asynchronous execution).
New in version 22
RequestUpdateUIParent: Executes the "Request for refreshing the display" event of the higher level at the end of the current process (asynchronous execution).
RequestUpdateUIParent: Executes the "Request for refreshing the display" event of the higher level at the end of the current process (asynchronous execution).
Versions 22 and later
ExecuteUpdateUIParent: Immediately executes the "Request for refreshing the display" event of the higher level. When these functions are called, you can specify the value of the parameters expected by "Request for refreshing the display".
Remark: The code that calls RequestUpdateUI determines the element whose event "Request for display update" is executed. If it is a class with the presenter attribute, the element will be the window associated with the class. Otherwise, it will be the element from which the code was executed.
New in version 22
ExecuteUpdateUIParent: Immediately executes the "Request for refreshing the display" event of the higher level. When these functions are called, you can specify the value of the parameters expected by "Request for refreshing the display".
Remark: The code that calls RequestUpdateUI determines the element whose event "Request for display update" is executed. If it is a class with the presenter attribute, the element will be the window associated with the class. Otherwise, it will be the element from which the code was executed.
ExecuteUpdateUIParent: Immediately executes the "Request for refreshing the display" event of the higher level. When these functions are called, you can specify the value of the parameters expected by "Request for refreshing the display".
Remark: The code that calls RequestUpdateUI determines the element whose event "Request for display update" is executed. If it is a class with the presenter attribute, the element will be the window associated with the class. Otherwise, it will be the element from which the code was executed.

"Presenter" attribute

The presenter attribute is used to associate a class of the presenter layer with a view (window, page or report).

This attribute is mainly used in the global declaration of the windows generated by the MVP RAD in WINDEV.

For example:

PROCEDURE WIN_Table_MyExampleFile(...
gclPresenter is PTableMyExampleFile dynamic<presenter>=Null)

With this attribute, the "Request for refreshing the display" window event will be triggered by:

any call to RequestUpdateUI from a class declared as <presenter>,
any call from any class associated with the <presenter> class.

For more details, see MVP RAD: "Presenter" attribute.

Business / UI classification: Neutral code

Component: wd270vm.dll