<Window>.EdUndo (Function)

ONLINE HELP
WINDEV, WEBDEV AND WINDEV MOBILE

Version:

Home | Sign in | English

Help / WLanguage / WLanguage functions / Controls, pages and windows / Windows functions that can be handled by the end user

Use conditions
Use example

WINDEV

WEBDEV

WINDEV Mobile

Others

See also

<Window>.EdUndo (Function)

In french: <Fenêtre>.EdUndo

Undoes the last action performed by the end user when modifying the interface ("Allow end users to modify the UI" option enabled). This function is equivalent to an "Undo" (Ctrl + Z) performed by the user.

This function is mainly used when creating an editor through programming (see "Remarks").

Example

// [Cancel] button
WIN_Form.EdUndo()

Syntax

<Window>.EdUndo()

<Window>: Window name

Name of the window or internal window to be used. This window must be in edit mode (<Window>.EdActive).

Remarks

Use conditions

<Window>.EdUndo has no effect if there is no action to cancel.
If the last action is a custom action run by <Window>.EdDo, the procedure defined by WinEdDeclareUndo is run.
The canceled action can be restored:
- by Ctrl + Y,
- programmatically with the <Window>.EdRedo function.

Use example

<Window>.EdDo is used to create custom actions (control creation for example) that support the undo/redo feature.

Let's take a simple example: creating a graphic object editor.

A button is used to create a shape. The user must have the ability to undo the shape creation. The following operations are performed:

The window switches to edit mode (<Window>.EdActive).
Calling <Window>.EdDo. The procedure called by this function is used to create the shape. This procedure also contains the call to WinEdDeclareUndo. WinEdDeclareUndo is used to define the behavior in case of user cancellation.
The window switches to standard mode (<Window>.EdActive).

The end user can undo this action (Ctrl + Z or call to <Window>.EdUndo) and eventually redo it (Ctrl + Y or call to <Window>.EdRedo).

Component: wd290obj.dll