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<?php
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/**
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* @file
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* Plugin to provide access control/visibility based on existence of a specified context.
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*/
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$plugin = array(
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'title' => t("Context exists"),
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'description' => t('Control access by whether or not a context exists and contains data.'),
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'callback' => 'ctools_context_exists_ctools_access_check',
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'settings form' => 'ctools_context_exists_ctools_access_settings',
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'summary' => 'ctools_context_exists_ctools_access_summary',
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'required context' => new ctools_context_required(t('Context'), 'any', TRUE),
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'defaults' => array('exists' => TRUE),
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);
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/**
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* Settings form.
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*/
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function ctools_context_exists_ctools_access_settings($form, &$form_state, $conf) {
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$form['settings']['exists'] = array(
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'#type' => 'radios',
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'#description' => t("Check to see if the context exists (contains data) or does not exist (contains no data). For example, if a context is optional and the path does not contain an argument for that context, it will not exist."),
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'#options' => array(TRUE => t('Exists'), FALSE => t("Doesn't exist")),
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'#default_value' => $conf['exists'],
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);
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return $form;
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}
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/**
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* Check for access.
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*/
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function ctools_context_exists_ctools_access_check($conf, $context) {
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// Xor returns false if the two bools are the same, and true if they are not.
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// i.e, if we asked for context_exists and it does, return true.
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// If we asked for context does not exist and it does, return false.
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return (empty($context->data) xor !empty($conf['exists']));
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}
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/**
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* Provide a summary description based upon the specified context.
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*/
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function ctools_context_exists_ctools_access_summary($conf, $context) {
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if (!empty($conf['exists'])) {
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return t('@identifier exists', array('@identifier' => $context->identifier));
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}
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else {
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return t('@identifier does not exist', array('@identifier' => $context->identifier));
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}
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}
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