Example usage for org.apache.wicket.markup.html.form Form visitFormComponentsPostOrder

Introduction

In this page you can find the example usage for org.apache.wicket.markup.html.form Form visitFormComponentsPostOrder.

Prototype

public final <R> R visitFormComponentsPostOrder(final IVisitor<? extends FormComponent<?>, R> visitor) 

Source Link

Document

Convenient and typesafe way to visit all the form components on a form postorder (deepest first)

Usage

From source file:com.doculibre.constellio.wicket.behaviors.SetFocusBehavior.java

License:Open Source License

/**
 * @see org.apache.wicket.behavior.AbstractBehavior#renderHead(org.apache.wicket.markup.html.IHeaderResponse)
 *//*from  w  w w  .j av a  2 s  .com*/
public void renderHead(final IHeaderResponse response) {
    Component focusComponent = (Component) focusComponentModel.getObject();
    if (focusComponent != null) {
        // If the focusComponent is a form, we will set the focus on one of
        // its fields.
        if (focusComponent instanceof Form) {
            Form form = (Form) focusComponent;

            // If the form has been submitted, we want to set the focus on
            // its first invalid field.
            if (form.isSubmitted()) {
                form.visitFormComponentsPostOrder(new IVisitor() {
                    public Object formComponent(IFormVisitorParticipant formParticipant) {
                        Object result;
                        if (formParticipant instanceof FormComponent) {
                            FormComponent formComponent = (FormComponent) formParticipant;
                            // We cannot set focus on an hidden field or a button.
                            if (!(formComponent instanceof HiddenField) && !(formComponent instanceof Button)
                                    && !formComponent.isValid()) {
                                setFocus(formComponent, response);
                                // Will break the loop.
                                result = Component.IVisitor.STOP_TRAVERSAL;
                            } else {
                                // Will continue the loop.
                                result = Component.IVisitor.CONTINUE_TRAVERSAL;
                            }
                        } else {
                            // Will continue the loop.
                            result = Component.IVisitor.CONTINUE_TRAVERSAL;
                        }
                        return result;
                    }
                });
            } else {
                // Since the form has not been submitted, we will set the
                // focus on its first field.
                form.visitFormComponentsPostOrder(new IVisitor() {
                    public Object formComponent(IFormVisitorParticipant formParticipant) {
                        Object result;
                        if (formParticipant instanceof FormComponent) {
                            FormComponent formComponent = (FormComponent) formParticipant;
                            // We cannot set focus on an hidden field or a button.
                            if (!(formComponent instanceof HiddenField) && !(formComponent instanceof Button)
                                    && formComponent.isEnabled() && formComponent.isVisible()) {
                                setFocus(formComponent, response);
                                // Will break the loop.
                                result = Component.IVisitor.STOP_TRAVERSAL;
                            } else {
                                // Will continue the loop.
                                result = Component.IVisitor.CONTINUE_TRAVERSAL;
                            }
                        } else {
                            // Will continue the loop.
                            result = Component.IVisitor.CONTINUE_TRAVERSAL;
                        }
                        return result;
                    }
                });
            }
        } else {
            // The focusComponent is not a form, so we will set the focus on
            // it.
            setFocus(focusComponent, response);
        }
    }
}

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