CUBA Platform. Developer's Manual
4.5.1.3. Screen Controller

validateAll() – validates a screen. The default implementation calls validate() for all screen components implementing the Component.Validatable interface, collects information about exceptions and displays corresponding message. Method returns false, if any exceptions were found; and true otherwise.

This method should be overridden only if it is required to override screen validation procedure completely. It is sufficient to implement a special template method – postValidate(), if validation should be just supplemented.

postValidate() – a template method that can be implemented in controller for additional screen validation. The method stores validation errors information in ValidationErrors object which is passed to it. Afterwards this information is displayed together with the errors of standard validation. For example:

private Pattern pattern = Pattern.compile("\\d");

@Override
protected void postValidate(ValidationErrors errors) {
    if (getItem().getAddress().getCity() != null) {
        if (pattern.matcher(getItem().getAddress().getCity()).find()) {
            errors.add("City name can't contain digits");
        }
    }
}

close() – closes this screen.

The method accepts string value, which is then passed to preClose() template method and to CloseListener listeners. Thus, the information about the reason why the window was closed can be obtained from the code that initiated the closing event. It is recommended to use the following constants for closing edit screens: Window.COMMIT_ACTION_ID after committing changes, Window.CLOSE_ACTION_ID – without committing changes.

If any of the datasources contains unsaved changes, a dialog with a corresponding message will be displayed before the screen is closed. Notification type may be adjusted using the cuba.gui.useSaveConfirmation application property.

A variant of close() method with force = true parameter closes the screen without calling preClose() and without a notification regardless of any unsaved changes.

close() method returns true, if the screen is closed successfully, and false – if closing procedure was interrupted.

preClose() is a template method which can be implemented in a controller to intercept the moment when the window closes. The method receives a string value provided by the closing initiator when invoking close() method.

If the preClose() method returns false, the window closing process is interrupted.