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<?php
/**
* @defgroup views_filter_handlers Views' filter handlers
* @{
* Handlers to tell Views how to filter queries.
*
* Definition items:
* - allow empty: If true, the 'IS NULL' and 'IS NOT NULL' operators become
* available as standard operators.
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*
* Object flags:
* You can set some specific behavior by setting up the following flags on
* your custom class.
*
* - no_single:
* Disable the possibility to force a single value.
* - no_operator:
* Disable the possibility to use operators.
* - no_optional:
* Disable the possibility to allow a exposed input to be optional.
*/
/**
* Base class for filters.
*/
class views_handler_filter extends views_handler {
/**
* Provide some extra help to get the operator/value easier to use.
*
* This likely has to be overridden by filters which are more complex
* than simple operator/value.
*/
function init(&$view, &$options) {
parent::init($view, $options);
$this->operator = $this->options['operator'];
$this->value = $this->options['value'];
// Compatibility: Set use_operator to true if the old way of using
// the operator is set and use_operator is NULL (was never set).
if (!empty($options['exposed']) && !empty($options['expose']['operator']) && !isset($options['expose']['use_operator'])) {
$this->options['expose']['use_operator'] = TRUE;
}
// If there are relationships in the view, allow empty should be true
// so that we can do IS NULL checks on items. Not all filters respect
// allow empty, but string and numeric do and that covers enough.
if ($this->view->display_handler->get_option('relationships')) {
$this->definition['allow empty'] = TRUE;
}
}
function option_definition() {
$options = parent::option_definition();
$options['operator'] = array('default' => '=');
$options['value'] = array('default' => '');
$options['group'] = array('default' => '0');
$options['exposed'] = array('default' => FALSE);
$options['expose'] = array(
'contains' => array(
'operator' => array('default' => FALSE),
'label' => array('default' => '', 'translatable' => TRUE),
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'use_operator' => array('default' => 0),
'operator' => array('default' => ''),
'identifier' => array('default' => ''),
'optional' => array('default' => 1),
'remember' => array('default' => 0),
'single' => array('default' => 1),
),
);
return $options;
}
/**
* Display the filter on the administrative summary
*/
function admin_summary() {
return check_plain((string) $this->operator) . ' ' . check_plain((string) $this->value);
}
/**
* Determine if a filter can be exposed.
*/
function can_expose() { return TRUE; }
/**
* Provide the basic form which calls through to subforms.
* If overridden, it is best to call through to the parent,
* or to at least make sure all of the functions in this form
* are called.
*/
function options_form(&$form, &$form_state) {
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parent::options_form($form, $form_state);
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if ($this->can_expose()) {
$this->show_expose_button($form, $form_state);
}
$form['op_val_start'] = array('#markup' => '<div class="clearfix">');
$this->show_operator_form($form, $form_state);
$this->show_value_form($form, $form_state);
$form['op_val_end'] = array('#markup' => '</div>');
if ($this->can_expose()) {
$this->show_expose_form($form, $form_state);
}
}
/**
* Simple validate handler
*/
function options_validate(&$form, &$form_state) {
$this->operator_validate($form, $form_state);
$this->value_validate($form, $form_state);
if (!empty($this->options['exposed'])) {
$this->expose_validate($form, $form_state);
}
}
/**
* Simple submit handler
*/
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unset($form_state['values']['expose_button']); // don't store this.
$this->operator_submit($form, $form_state);
$this->value_submit($form, $form_state);
if (!empty($this->options['exposed'])) {
$this->expose_submit($form, $form_state);
}
}
/**
* Shortcut to display the operator form.
*/
function show_operator_form(&$form, &$form_state) {
$this->operator_form($form, $form_state);
$form['operator']['#prefix'] = '<div class="views-left-30">';
$form['operator']['#suffix'] = '</div>';
}
/**
* Provide a form for setting the operator.
*
* This may be overridden by child classes, and it must
* define $form['operator'];
*/
function operator_form(&$form, &$form_state) {
$options = $this->operator_options();
if (!empty($options)) {
$form['operator'] = array(
'#type' => count($options) < 10 ? 'radios' : 'select',
'#title' => t('Operator'),
'#default_value' => $this->operator,
'#options' => $options,
);
}
}
/**
* Provide a list of options for the default operator form.
* Should be overridden by classes that don't override operator_form
*/
function operator_options() { return array(); }
/**
* Validate the operator form.
*/
function operator_validate($form, &$form_state) { }
/**
* Perform any necessary changes to the form values prior to storage.
* There is no need for this function to actually store the data.
*/
function operator_submit($form, &$form_state) { }
/**
* Shortcut to display the value form.
*/
function show_value_form(&$form, &$form_state) {
$this->value_form($form, $form_state);
if (empty($this->no_operator)) {
$form['value']['#prefix'] = '<div class="views-right-70">' . (isset($form['value']['#prefix']) ? $form['value']['#prefix'] : '');
$form['value']['#suffix'] = (isset($form['value']['#suffix']) ? $form['value']['#suffix'] : '') . '</div>';
}
}
/**
* Provide a form for setting options.
*
* This should be overridden by all child classes and it must
* define $form['value']
*/
function value_form(&$form, &$form_state) { $form['value'] = array(); }
/**
* Validate the options form.
*/
function value_validate($form, &$form_state) { }
/**
* Perform any necessary changes to the form values prior to storage.
* There is no need for this function to actually store the data.
*/
function value_submit($form, &$form_state) { }
/**
* Handle the 'left' side fo the exposed options form.
*/
function expose_form_left(&$form, &$form_state) {
if (!empty($form['operator']['#type'])) {
$form['expose']['use_operator'] = array(
'#type' => 'checkbox',
'#title' => t('Unlock operator'),
'#description' => t('When checked, the operator will be exposed to the user'),
'#default_value' => !empty($this->options['expose']['use_operator']),
);
$form['expose']['operator'] = array(
'#type' => 'textfield',
'#default_value' => $this->options['expose']['operator'],
'#title' => t('Operator identifier'),
'#size' => 40,
'#description' => t('This will appear in the URL after the ? to identify this operator.'),
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'#process' => array('ctools_dependent_process'),
'#dependency' => array(
'edit-options-expose-use-operator' => array(1)
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),
);
}
else {
$form['expose']['operator'] = array(
'#type' => 'value',
'#value' => '',
);
}
$form['expose']['identifier'] = array(
'#type' => 'textfield',
'#default_value' => $this->options['expose']['identifier'],
'#title' => t('Filter identifier'),
'#size' => 40,
'#description' => t('This will appear in the URL after the ? to identify this filter. Cannot be blank.'),
);
$form['expose']['label'] = array(
'#type' => 'textfield',
'#default_value' => $this->options['expose']['label'],
'#title' => t('Label'),
'#size' => 40,
);
}
/**
* Handle the 'right' side fo the exposed options form.
*/
function expose_form_right(&$form, &$form_state) {
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if (empty($this->no_optional)) {
$form['expose']['optional'] = array(
'#type' => 'checkbox',
'#title' => t('Optional'),
'#description' => t('This exposed filter is optional and will have added options to allow it not to be set.'),
'#default_value' => $this->options['expose']['optional'],
);
}
if (empty($this->no_single)) {
$form['expose']['single'] = array(
'#type' => 'checkbox',
'#title' => t('Force single'),
'#description' => t('Force this exposed filter to accept only one option.'),
'#default_value' => $this->options['expose']['single'],
);
}
$form['expose']['remember'] = array(
'#type' => 'checkbox',
'#title' => t('Remember'),
'#description' => t('Remember the last setting the user gave this filter.'),
'#default_value' => $this->options['expose']['remember'],
);
}
/**
* Validate the options form.
*/
function expose_validate($form, &$form_state) {
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if (empty($form_state['values']['options']['expose']['identifier'])) {
form_error($form['expose']['identifier'], t('The identifier is required if the filter is exposed.'));
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}
if (!empty($form_state['values']['options']['expose']['identifier']) && $form_state['values']['options']['expose']['identifier'] == 'value') {
form_error($form['expose']['identifier'], t('This identifier is not allowed.'));
}
if (!$this->view->display_handler->is_identifier_unique($form_state['id'], $form_state['values']['options']['expose']['identifier'])) {
form_error($form['expose']['identifier'], t('This identifier is used by another handler.'));
}
}
/**
* Provide default options for exposed filters.
*/
function expose_options() {
$this->options['expose'] = array(
'use_operator' => FALSE,
'operator' => $this->options['id'] . '_op',
'identifier' => $this->options['id'],
'label' => $this->ui_name(),
'remember' => FALSE,
'single' => TRUE,
'optional' => TRUE,
);
}
/**
* Render our chunk of the exposed filter form when selecting
*
* You can override this if it doesn't do what you expect.
*/
function exposed_form(&$form, &$form_state) {
if (empty($this->options['exposed'])) {
return;
}
// Build the exposed form, when its based on an operator.
if (!empty($this->options['expose']['use_operator']) && !empty($this->options['expose']['operator'])) {
$operator = $this->options['expose']['operator'];
$this->operator_form($form, $form_state);
$form[$operator] = $form['operator'];
if (isset($form[$operator]['#title'])) {
unset($form[$operator]['#title']);
}
$this->exposed_translate($form[$operator], 'operator');
unset($form['operator']);
}
// Build the form and set the value based on the identifier.
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if (!empty($this->options['expose']['identifier'])) {
$value = $this->options['expose']['identifier'];
$this->value_form($form, $form_state);
$form[$value] = $form['value'];
if (isset($form[$value]['#title']) && !empty($form[$value]['#type']) && $form[$value]['#type'] != 'checkbox') {
unset($form[$value]['#title']);
}
$this->exposed_translate($form[$value], 'value');
if (!empty($form['#type']) && ($form['#type'] == 'checkboxes' || ($form['#type'] == 'select' && !empty($form['#multiple'])))) {
unset($form[$value]['#default_value']);
}
if (!empty($form['#type']) && $form['#type'] == 'select' && empty($form['#multiple'])) {
$form[$value]['#default_value'] = 'All';
}
if ($value != 'value') {
unset($form['value']);
}
}
}
/**
* Make some translations to a form item to make it more suitable to
* exposing.
*/
function exposed_translate(&$form, $type) {
if (!isset($form['#type'])) {
return;
}
if ($form['#type'] == 'radios') {
$form['#type'] = 'select';
}
// Checkboxes don't work so well in exposed forms due to GET conversions.
if ($form['#type'] == 'checkboxes') {
if (empty($form['#no_convert']) || !empty($this->options['expose']['single'])) {
$form['#type'] = 'select';
}
if (empty($this->options['expose']['single'])) {
$form['#multiple'] = TRUE;
}
}
if (!empty($this->options['expose']['single']) && isset($form['#multiple'])) {
unset($form['#multiple']);
$form['#size'] = NULL;
}
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if ($type == 'value' && empty($this->no_optional) && !empty($this->options['expose']['optional']) && $form['#type'] == 'select' && empty($form['#multiple'])) {
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$any_label = variable_get('views_exposed_filter_any_label', 'old_any') == 'old_any' ? t('<Any>') : t('- Any -');
$form['#options'] = array('All' => $any_label) + $form['#options'];
$form['#default_value'] = 'All';
}
}
/**
* Tell the renderer about our exposed form. This only needs to be
* overridden for particularly complex forms. And maybe not even then.
*
* @return
* An array with the following keys:
* - operator: The $form key of the operator. Set to NULL if no operator.
* - value: The $form key of the value. Set to NULL if no value.
* - label: The label to use for this piece.
*/
function exposed_info() {
if (empty($this->options['exposed'])) {
return;
}
return array(
'operator' => $this->options['expose']['operator'],
'value' => $this->options['expose']['identifier'],
'label' => $this->options['expose']['label'],
);
}
/**
* Check to see if input from the exposed filters should change
* the behavior of this filter.
*/
function accept_exposed_input($input) {
if (empty($this->options['exposed'])) {
return TRUE;
}
if (!empty($this->options['expose']['use_operator']) && !empty($this->options['expose']['operator']) && isset($input[$this->options['expose']['operator']])) {
$this->operator = $input[$this->options['expose']['operator']];
}
if (!empty($this->options['expose']['identifier'])) {
$value = $input[$this->options['expose']['identifier']];
// Various ways to check for the absence of optional input.
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if (empty($this->no_optional) && !empty($this->options['expose']['optional'])) {
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if (($this->operator == 'empty' || $this->operator == 'not empty') && $value === '') {
$value = ' ';
}
if ($this->operator != 'empty' && $this->operator != 'not empty') {
if ($value == 'All' || $value === array()) {
return FALSE;
}
}
if (!empty($this->no_single) && $value === '') {
return FALSE;
}
}
if (isset($value)) {
$this->value = $value;
if (empty($this->no_single) && !empty($this->options['expose']['single'])) {
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$this->value = array($value);
}
}
else {
return FALSE;
}
}
return TRUE;
}
function store_exposed_input($input, $status) {
if (empty($this->options['exposed']) || empty($this->options['expose']['identifier'])) {
return TRUE;
}
if (empty($this->options['expose']['remember'])) {
return;
}
// Figure out which display id is responsible for the filters, so we
// know where to look for session stored values.
$display_id = ($this->view->display_handler->is_defaulted('filters')) ? 'default' : $this->view->current_display;
// shortcut test.
$operator = !empty($this->options['expose']['use_operator']) && !empty($this->options['expose']['operator']);
// false means that we got a setting that means to recuse ourselves,
// so we should erase whatever happened to be there.
if (!$status && isset($_SESSION['views'][$this->view->name][$display_id])) {
$session = &$_SESSION['views'][$this->view->name][$display_id];
if ($operator && isset($session[$this->options['expose']['operator']])) {
unset($session[$this->options['expose']['operator']]);
}
if (isset($session[$this->options['expose']['identifier']])) {
unset($session[$this->options['expose']['identifier']]);
}
}
if ($status) {
if (!isset($_SESSION['views'][$this->view->name][$display_id])) {
$_SESSION['views'][$this->view->name][$display_id] = array();
}
$session = &$_SESSION['views'][$this->view->name][$display_id];
if ($operator && isset($input[$this->options['expose']['operator']])) {
$session[$this->options['expose']['operator']] = $input[$this->options['expose']['operator']];
}
$session[$this->options['expose']['identifier']] = $input[$this->options['expose']['identifier']];
}
}
/**
* Add this filter to the query.
*
* Due to the nature of fapi, the value and the operator have an unintended
* level of indirection. You will find them in $this->operator
* and $this->value respectively.
*/
function query() {
$this->ensure_my_table();
$this->query->add_where($this->options['group'], "$this->table_alias.$this->real_field", $this->value, $this->operator);
}
/**
* Can this filter be used in OR groups?
*
* Some filters have complicated where clauses that cannot be easily used
* with OR groups. Some filters must also use HAVING which also makes
* them not groupable. These filters will end up in a special group
* if OR grouping is in use.
*/
function can_group() {
return TRUE;
}
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}
/**
* A special handler to take the place of missing or broken handlers.
*/
class views_handler_filter_broken extends views_handler_filter {
function ui_name($short = FALSE) {
return t('Broken/missing handler');
}
function ensure_my_table() { /* No table to ensure! */ }
function query() { /* No query to run */ }
function options_form(&$form, &$form_state) {
$form['markup'] = array(
'#markup' => '<div class="form-item description">' . t('The handler for this item is broken or missing and cannot be used. If a module provided the handler and was disabled, re-enabling the module may restore it. Otherwise, you should probably delete this item.') . '</div>',
);
}
/**
* Determine if the handler is considered 'broken'
*/
function broken() { return TRUE; }
}
/**
* @}
*/