Examples of org.apache.wicket.behavior.Behavior

org.apache.wicket.behavior.Behavior
Behaviors are kind of plug-ins for Components. They allow functionality to be added to a component and get essential events forwarded by the component. They can be bound to a concrete component (using the bind method which is called when the behavior is attached), but they don't need to. They can modify the components markup by changing the rendered ComponentTag. Behaviors can have their own models as well, and they are notified when these are to be detached by the component.
You also cannot modify a components model with a behavior.
@see org.apache.wicket.behavior.IBehaviorListener @see org.apache.wicket.markup.html.IHeaderContributor @see org.apache.wicket.behavior.AbstractAjaxBehavior @see org.apache.wicket.AttributeModifier @author Ralf Ebert @author Eelco Hillenius @author Igor Vaynberg (ivaynberg)

   */
  public void remove(final IFormValidator validator)
  {
    Args.notNull(validator, "validator");


    Behavior match = null;
    for (Behavior behavior : getBehaviors())
    {
      if (behavior.equals(validator))
      {
        match = behavior;

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      if (tag.hasBehaviors())
      {
        Iterator<? extends Behavior> tagBehaviors = tag.getBehaviors();
        while (tagBehaviors.hasNext())
        {
          final Behavior behavior = tagBehaviors.next();
          if (behavior.isEnabled(this))
          {
            behavior.onComponentTag(this, tag);
          }
          behavior.detach(this);
        }
      }


      if ((tag instanceof WicketTag) && !tag.isClose() &&
        !getFlag(FLAG_IGNORE_ATTRIBUTE_MODIFIER))

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   * @param fc
   *            form component
   */
  public final void enableFocusTracking(final FormComponent<?> fc)
  {
    fc.add(new Behavior()
    {
      private static final long serialVersionUID = 1L;


      @Override
      public void bind(Component component)

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   * @return form component for chaining
   */
  public final FormComponent<T> remove(final IValidator<? super T> validator)
  {
    Args.notNull(validator, "validator");
    Behavior match = null;
    for (Behavior behavior : getBehaviors())
    {
      if (behavior.equals(validator))
      {
        match = behavior;

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        Collection<FuncValidationRule> funcRules = this.options
                .getFuncValidationRules();
        if (Utils.isNotEmpty(funcRules)) {
            for (final FuncValidationRule r : funcRules) {
                component.add(new Behavior() {
                    private static final long serialVersionUID = 1L;


                    @Override
                    public void renderHead(Component component, IHeaderResponse response) {
                        response.render(JavaScriptHeaderItem.forScript(r.getFuncDef(), UUID.randomUUID().toString()));

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                            image = new Image("icon", "statuses/inactive.png");
                            alt = "failure icon";
                            title = "failure";
                    }


                    image.add(new Behavior() {


                        private static final long serialVersionUID = 1469628524240283489L;


                        @Override
                        public void onComponentTag(final Component component, final ComponentTag tag) {

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        } else {
            value = "";
        }


        Component label = new Label("value", value).add(new Behavior() {


            private static final long serialVersionUID = 1469628524240283489L;


            @Override
            public void onComponentTag(final Component component, final ComponentTag tag) {

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        }


        final Fragment frag;


        if (image != null) {
            image.add(new Behavior() {


                private static final long serialVersionUID = 1469628524240283489L;


                @Override
                public void onComponentTag(final Component component, final ComponentTag tag) {

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    }
    else
    {
      try
      {
        Behavior behavior = getComponent().getBehaviorById(behaviorId);
        listenerInterface.invoke(getComponent(), behavior);
      }
      catch (IndexOutOfBoundsException e)
      {
        throw new WicketRuntimeException("Couldn't find component behavior.", e);

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      if (tag.hasBehaviors())
      {
        Iterator<? extends Behavior> tagBehaviors = tag.getBehaviors();
        while (tagBehaviors.hasNext())
        {
          final Behavior behavior = tagBehaviors.next();
          if (behavior.isEnabled(this))
          {
            behavior.onComponentTag(this, tag);
          }
          behavior.detach(this);
        }
      }


      // Apply behavior modifiers
      List<? extends Behavior> behaviors = getBehaviors();
      if ((behaviors != null) && !behaviors.isEmpty() && !tag.isClose() &&
        (isIgnoreAttributeModifier() == false))
      {
        tag = tag.mutable();
        for (Behavior behavior : behaviors)
        {
          // Components may reject some behavior components
          if (isBehaviorAccepted(behavior))
          {
            behavior.onComponentTag(this, tag);
          }
        }
      }


      if ((tag instanceof WicketTag) && !tag.isClose() &&

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