MWException: Don't send headers multiple times

[mediawiki.git] / includes / htmlform / HTMLCheckMatrix.php

<?php

/**
 * A checkbox matrix
 * Operates similarly to HTMLMultiSelectField, but instead of using an array of
 * options, uses an array of rows and an array of columns to dynamically
 * construct a matrix of options. The tags used to identify a particular cell
 * are of the form "columnName-rowName"
 *
 * Options:
 *   - columns
 *     - Required list of columns in the matrix.
 *   - rows
 *     - Required list of rows in the matrix.
 *   - force-options-on
 *     - Accepts array of column-row tags to be displayed as enabled but unavailable to change
 *   - force-options-off
 *     - Accepts array of column-row tags to be displayed as disabled but unavailable to change.
 *   - tooltips
 *     - Optional array mapping row label to tooltip content
 *   - tooltip-class
 *     - Optional CSS class used on tooltip container span. Defaults to mw-icon-question.
 */
class HTMLCheckMatrix extends HTMLFormField implements HTMLNestedFilterable {
        static private $requiredParams = array(
                // Required by underlying HTMLFormField
                'fieldname',
                // Required by HTMLCheckMatrix
                'rows',
                'columns'
        );

        public function __construct( $params ) {
                $missing = array_diff( self::$requiredParams, array_keys( $params ) );
                if ( $missing ) {
                        throw new HTMLFormFieldRequiredOptionsException( $this, $missing );
                }
                parent::__construct( $params );
        }

        function validate( $value, $alldata ) {
                $rows = $this->mParams['rows'];
                $columns = $this->mParams['columns'];

                // Make sure user-defined validation callback is run
                $p = parent::validate( $value, $alldata );
                if ( $p !== true ) {
                        return $p;
                }

                // Make sure submitted value is an array
                if ( !is_array( $value ) ) {
                        return false;
                }

                // If all options are valid, array_intersect of the valid options
                // and the provided options will return the provided options.
                $validOptions = array();
                foreach ( $rows as $rowTag ) {
                        foreach ( $columns as $columnTag ) {
                                $validOptions[] = $columnTag . '-' . $rowTag;
                        }
                }
                $validValues = array_intersect( $value, $validOptions );
                if ( count( $validValues ) == count( $value ) ) {
                        return true;
                } else {
                        return $this->msg( 'htmlform-select-badoption' )->parse();
                }
        }

        /**
         * Build a table containing a matrix of checkbox options.
         * The value of each option is a combination of the row tag and column tag.
         * mParams['rows'] is an array with row labels as keys and row tags as values.
         * mParams['columns'] is an array with column labels as keys and column tags as values.
         *
         * @param array $value Array of the options that should be checked
         *
         * @return string
         */
        function getInputHTML( $value ) {
                $html = '';
                $tableContents = '';
                $rows = $this->mParams['rows'];
                $columns = $this->mParams['columns'];

                $attribs = $this->getAttributes( array( 'disabled', 'tabindex' ) );

                // Build the column headers
                $headerContents = Html::rawElement( 'td', array(), '&#160;' );
                foreach ( $columns as $columnLabel => $columnTag ) {
                        $headerContents .= Html::rawElement( 'td', array(), $columnLabel );
                }
                $tableContents .= Html::rawElement( 'tr', array(), "\n$headerContents\n" );

                $tooltipClass = 'mw-icon-question';
                if ( isset( $this->mParams['tooltip-class'] ) ) {
                        $tooltipClass = $this->mParams['tooltip-class'];
                }

                // Build the options matrix
                foreach ( $rows as $rowLabel => $rowTag ) {
                        // Append tooltip if configured
                        if ( isset( $this->mParams['tooltips'][$rowLabel] ) ) {
                                $tooltipAttribs = array(
                                        'class' => "mw-htmlform-tooltip $tooltipClass",
                                        'title' => $this->mParams['tooltips'][$rowLabel],
                                );
                                $rowLabel .= ' ' . Html::element( 'span', $tooltipAttribs, '' );
                        }
                        $rowContents = Html::rawElement( 'td', array(), $rowLabel );
                        foreach ( $columns as $columnTag ) {
                                $thisTag = "$columnTag-$rowTag";
                                // Construct the checkbox
                                $thisAttribs = array(
                                        'id' => "{$this->mID}-$thisTag",
                                        'value' => $thisTag,
                                );
                                $checked = in_array( $thisTag, (array)$value, true );
                                if ( $this->isTagForcedOff( $thisTag ) ) {
                                        $checked = false;
                                        $thisAttribs['disabled'] = 1;
                                } elseif ( $this->isTagForcedOn( $thisTag ) ) {
                                        $checked = true;
                                        $thisAttribs['disabled'] = 1;
                                }
                                $rowContents .= Html::rawElement(
                                        'td',
                                        array(),
                                        Xml::check( "{$this->mName}[]", $checked, $attribs + $thisAttribs )
                                );
                        }
                        $tableContents .= Html::rawElement( 'tr', array(), "\n$rowContents\n" );
                }

                // Put it all in a table
                $html .= Html::rawElement( 'table',
                                array( 'class' => 'mw-htmlform-matrix' ),
                                Html::rawElement( 'tbody', array(), "\n$tableContents\n" ) ) . "\n";

                return $html;
        }

        protected function isTagForcedOff( $tag ) {
                return isset( $this->mParams['force-options-off'] )
                        && in_array( $tag, $this->mParams['force-options-off'] );
        }

        protected function isTagForcedOn( $tag ) {
                return isset( $this->mParams['force-options-on'] )
                        && in_array( $tag, $this->mParams['force-options-on'] );
        }

        /**
         * Get the complete table row for the input, including help text,
         * labels, and whatever.
         * We override this function since the label should always be on a separate
         * line above the options in the case of a checkbox matrix, i.e. it's always
         * a "vertical-label".
         *
         * @param string $value The value to set the input to
         *
         * @return string Complete HTML table row
         */
        function getTableRow( $value ) {
                list( $errors, $errorClass ) = $this->getErrorsAndErrorClass( $value );
                $inputHtml = $this->getInputHTML( $value );
                $fieldType = get_class( $this );
                $helptext = $this->getHelpTextHtmlTable( $this->getHelpText() );
                $cellAttributes = array( 'colspan' => 2 );

                $label = $this->getLabelHtml( $cellAttributes );

                $field = Html::rawElement(
                        'td',
                        array( 'class' => 'mw-input' ) + $cellAttributes,
                        $inputHtml . "\n$errors"
                );

                $html = Html::rawElement( 'tr', array( 'class' => 'mw-htmlform-vertical-label' ), $label );
                $html .= Html::rawElement( 'tr',
                        array( 'class' => "mw-htmlform-field-$fieldType {$this->mClass} $errorClass" ),
                        $field );

                return $html . $helptext;
        }

        /**
         * @param WebRequest $request
         *
         * @return array
         */
        function loadDataFromRequest( $request ) {
                if ( $this->mParent->getMethod() == 'post' ) {
                        if ( $request->wasPosted() ) {
                                // Checkboxes are not added to the request arrays if they're not checked,
                                // so it's perfectly possible for there not to be an entry at all
                                return $request->getArray( $this->mName, array() );
                        } else {
                                // That's ok, the user has not yet submitted the form, so show the defaults
                                return $this->getDefault();
                        }
                } else {
                        // This is the impossible case: if we look at $_GET and see no data for our
                        // field, is it because the user has not yet submitted the form, or that they
                        // have submitted it with all the options unchecked. We will have to assume the
                        // latter, which basically means that you can't specify 'positive' defaults
                        // for GET forms.
                        return $request->getArray( $this->mName, array() );
                }
        }

        function getDefault() {
                if ( isset( $this->mDefault ) ) {
                        return $this->mDefault;
                } else {
                        return array();
                }
        }

        function filterDataForSubmit( $data ) {
                $columns = HTMLFormField::flattenOptions( $this->mParams['columns'] );
                $rows = HTMLFormField::flattenOptions( $this->mParams['rows'] );
                $res = array();
                foreach ( $columns as $column ) {
                        foreach ( $rows as $row ) {
                                // Make sure option hasn't been forced
                                $thisTag = "$column-$row";
                                if ( $this->isTagForcedOff( $thisTag ) ) {
                                        $res[$thisTag] = false;
                                } elseif ( $this->isTagForcedOn( $thisTag ) ) {
                                        $res[$thisTag] = true;
                                } else {
                                        $res[$thisTag] = in_array( $thisTag, $data );
                                }
                        }
                }

                return $res;
        }
}