sterzycom/panel/app/controllers/pages.php

<?php

class PagesController extends Kirby\Panel\Controllers\Base {

  public function add($id) {

    $self   = $this;
    $parent = $this->page($id);
    $form   = $parent->form('add', function($form) use($parent, $self) {
    
      $form->validate();

      if(!$form->isValid()) {
        return $form->alert(l('pages.add.error.template'));
      } 

      try {        

        $data = $form->serialize();
        $page = $parent->children()->create($data['uid'], $data['template'], array(
          'title' => $data['title']
        ));

        $self->notify(':)');
        $this->redirect($page, 'edit');

      } catch(Exception $e) {
        $form->alert($e->getMessage());
      }

    });

    return $this->modal('pages/add', compact('form'));

  }

  public function edit($id) {

    $self = $this;
    
    try {
      $page = $this->page($id);      
    } catch(Exception $e) {
      if($page = $this->page(dirname($id))) {
        $this->alert(l('pages.error.missing'));
        $this->redirect($page);
      }
    }

    $form = $page->form('edit', function($form) use($page, $self) {
      
      // validate all fields
      $form->validate();

      // stop at invalid fields
      if(!$form->isValid()) {
        return $self->alert(l('pages.show.error.form'));
      }

      try {
        $page->update($form->serialize());
        $self->notify(':)');
        return $self->redirect($page);
      } catch(Exception $e) {
        return $self->alert($e->getMessage());
      }

    });

    return $this->screen('pages/edit', $page, array(
      'page'     => $page,
      'sidebar'  => $page->sidebar(),
      'form'     => $form,
      'uploader' => $this->snippet('uploader', array('url' => $page->url('upload')))
    ));

  }

  public function delete($id) {

    $self = $this;
    $page = $this->page($id);

    try {
      $page->isDeletable(true);
    } catch(Exception $e) {
      return $this->modal('error', array(
        'headline' => l($e->getMessage() . '.headline'),
        'text'     => l($e->getMessage() . '.text'),
        'back'     => $page->url()
      ));      
    }

    $form = $page->form('delete', function($form) use($page, $self) {
      try {
        $page->delete();
        $self->notify(':)');
        $self->redirect($page->parent()->isSite() ? '/' : $page->parent());
      } catch(Exception $e) {
        $form->alert($e->getMessage());
      }
    });

    return $this->modal('pages/delete', compact('form'));

  }

  public function keep($id) {
    $page = $this->page($id);
    $page->changes()->keep();
    $this->redirect($page);
  }

  public function discard($id) {
    $page = $this->page($id);
    $page->changes()->discard();
    $this->redirect($page);
  }

  public function url($id) {

    $self = $this;
    $page = $this->page($id);

    if(!$page->canChangeUrl()) {
      return $this->modal('error', array(
        'headline' => l('error'),
        'text'     => l('pages.url.error.rights'),
      ));
    }

    $form = $page->form('url', function($form) use($page, $self) {

      try {
        $page->move(get('uid'));              
        $self->notify(':)');
        $self->redirect($page);
      } catch(Exception $e) {
        $form->alert($e->getMessage());
        $form->fields->uid->error = true;
      }

    });

    return $this->modal('pages/url', compact('form'));

  }

  public function template($id) {

    $self = $this;
    $page = $this->page($id);

    if(!$page->canChangeTemplate()) {
      return $this->modal('error', array(
        'headline' => l('error'),
        'text'     => l('pages.template.error'),
      ));
    }

    if($info = get('info')) {
      $prep = $page->prepareForNewTemplate($page->blueprint()->name(), $info);      
      return $this->snippet('template', $prep);
    }

    $form = $page->form('template', function($form) use($page, $self) {

      try {

        $data = $form->serialize();

        $page->changeTemplate(a::get($data, 'template'));

        $self->notify(':)');
        $self->redirect($page);
      } catch(Exception $e) {
        $form->alert($e->getMessage());
      }

    });

    return $this->modal('pages/template', compact('form'));

  }

  public function toggle($id) {

    $self = $this;
    $page = $this->page($id);

    if($page->isErrorPage()) {
      return $this->modal('error', array(
        'headline' => l('error'),
        'text'     => l('pages.toggle.error.error'),
      ));
    }

    $form = $page->form('toggle', function($form) use($page, $self) {

      try {
        $page->toggle(get('position', 'last'));
        $self->notify(':)');
        $self->redirect($page);
      } catch(Exception $e) {
        $form->alert($e->getMessage());
      }

    });

    return $this->modal('pages/toggle', compact('form'));

  }

  public function context($id) {
    return $this->page($id)->menu('context');
  }

}