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CSSVars.php
<?php namespace WPForms\Frontend; /** * CSS variables class. * * @since 1.8.1 */ class CSSVars { /** * White color. * * @since 1.8.8 * * @var string */ const WHITE = '#ffffff'; /** * Root vars and values. * * @since 1.8.1 * * @var array */ const ROOT_VARS = [ 'field-border-radius' => '3px', 'field-border-style' => 'solid', 'field-border-size' => '1px', 'field-background-color' => self::WHITE, 'field-border-color' => 'rgba( 0, 0, 0, 0.25 )', 'field-text-color' => 'rgba( 0, 0, 0, 0.7 )', 'field-menu-color' => self::WHITE, 'label-color' => 'rgba( 0, 0, 0, 0.85 )', 'label-sublabel-color' => 'rgba( 0, 0, 0, 0.55 )', 'label-error-color' => '#d63637', 'button-border-radius' => '3px', 'button-border-style' => 'none', 'button-border-size' => '1px', 'button-background-color' => '#066aab', 'button-border-color' => '#066aab', 'button-text-color' => self::WHITE, 'page-break-color' => '#066aab', 'background-image' => 'none', 'background-position' => 'center center', 'background-repeat' => 'no-repeat', 'background-size' => 'cover', 'background-width' => '100px', 'background-height' => '100px', 'background-color' => 'rgba( 0, 0, 0, 0 )', 'background-url' => 'url()', 'container-padding' => '0px', 'container-border-style' => 'none', 'container-border-width' => '1px', 'container-border-color' => '#000000', 'container-border-radius' => '3px', ]; /** * Container shadow vars and values. * * @since 1.8.8 * * @var array */ const CONTAINER_SHADOW_SIZE = [ 'none' => [ 'box-shadow' => 'none', ], 'small' => [ 'box-shadow' => '0px 3px 5px 0px rgba(0, 0, 0, 0.1)', ], 'medium' => [ 'box-shadow' => '0px 10px 20px 0px rgba(0, 0, 0, 0.1)', ], 'large' => [ 'box-shadow' => '0px 30px 50px -10px rgba(0, 0, 0, 0.15)', ], ]; /** * Field Size vars and values. * * @since 1.8.1 * * @var array */ const FIELD_SIZE = [ 'small' => [ 'input-height' => '31px', 'input-spacing' => '10px', 'font-size' => '14px', 'line-height' => '17px', 'padding-h' => '9px', 'checkbox-size' => '14px', 'sublabel-spacing' => '5px', 'icon-size' => '0.75', ], 'medium' => [ 'input-height' => '43px', 'input-spacing' => '15px', 'font-size' => '16px', 'line-height' => '19px', 'padding-h' => '14px', 'checkbox-size' => '16px', 'sublabel-spacing' => '5px', 'icon-size' => '1', ], 'large' => [ 'input-height' => '50px', 'input-spacing' => '20px', 'font-size' => '18px', 'line-height' => '21px', 'padding-h' => '14px', 'checkbox-size' => '18px', 'sublabel-spacing' => '10px', 'icon-size' => '1.25', ], ]; /** * Label Size vars and values. * * @since 1.8.1 * * @var array */ const LABEL_SIZE = [ 'small' => [ 'font-size' => '14px', 'line-height' => '17px', 'sublabel-font-size' => '13px', 'sublabel-line-height' => '16px', ], 'medium' => [ 'font-size' => '16px', 'line-height' => '19px', 'sublabel-font-size' => '14px', 'sublabel-line-height' => '17px', ], 'large' => [ 'font-size' => '18px', 'line-height' => '21px', 'sublabel-font-size' => '16px', 'sublabel-line-height' => '19px', ], ]; /** * Button Size vars and values. * * @since 1.8.1 * * @var array */ const BUTTON_SIZE = [ 'small' => [ 'font-size' => '14px', 'height' => '37px', 'padding-h' => '15px', 'margin-top' => '5px', ], 'medium' => [ 'font-size' => '17px', 'height' => '41px', 'padding-h' => '15px', 'margin-top' => '10px', ], 'large' => [ 'font-size' => '20px', 'height' => '48px', 'padding-h' => '20px', 'margin-top' => '15px', ], ]; /** * Spare variables. * * @since 1.8.8 * * @var array */ const SPARE_VARS = [ 'field-border-color' ]; /** * Render engine. * * @since 1.8.1 * * @var string */ private $render_engine; /** * CSS variables. * * @since 1.8.1 * * @var array */ private $css_vars; /** * Flag to check if root CSS vars were output. * * @since 1.8.1 * * @var bool */ private $is_root_vars_displayed; /** * Initialize class. * * @since 1.8.1 */ public function init() { $this->init_vars(); $this->hooks(); } /** * Register hooks. * * @since 1.8.1 */ private function hooks() { add_action( 'wp_head', [ $this, 'output_root' ], PHP_INT_MAX ); } /** * CSS variables data. * * @since 1.8.1 */ private function init_vars() { $vars = []; $vars[':root'] = array_merge( self::ROOT_VARS, $this->get_complex_vars( 'field-size', self::FIELD_SIZE['medium'] ), $this->get_complex_vars( 'label-size', self::LABEL_SIZE['medium'] ), $this->get_complex_vars( 'button-size', self::BUTTON_SIZE['medium'] ), $this->get_complex_vars( 'container-shadow-size', self::CONTAINER_SHADOW_SIZE['none'] ) ); /** * Allows developers to modify default CSS variables which output on the frontend. * * @since 1.8.1 * * @param array $vars CSS variables two-dimensional array. * First level keys is the CSS selector. * Second level keys is the variable name without the `--wpforms-` prefix. */ $this->css_vars = apply_filters( 'wpforms_frontend_css_vars_init_vars', $vars ); } /** * Get complex CSS variables data. * * @since 1.8.1 * * @param string $prefix CSS variable prefix. * @param array $values Values. */ public function get_complex_vars( $prefix, $values ): array { $vars = []; foreach ( $values as $key => $value ) { $vars[ "{$prefix}-{$key}" ] = $value; } return $vars; } /** * Get CSS variables data by selector. * * @since 1.8.1 * * @param string $selector Selector. * * @return array */ public function get_vars( $selector ): array { if ( empty( $selector ) ) { $selector = ':root'; } if ( empty( $this->css_vars[ $selector ] ) ) { return []; } return $this->css_vars[ $selector ]; } /** * Output root CSS variables. * * @since 1.8.1 * @since 1.8.1.2 Added $force argument. * * @param bool $force Force output root variables. */ public function output_root( $force = false ) { if ( ! empty( $this->is_root_vars_displayed ) && empty( $force ) ) { return; } $this->output_selector_vars( ':root', $this->css_vars[':root'] ); $this->is_root_vars_displayed = true; } /** * Output selector's CSS variables. * * @since 1.8.1 * * @param string $selector Selector. * @param array $vars Variables data. * @param string $style_id Style tag ID attribute. Optional. Default is empty string. * @param string|int $form_id Form ID. Optional. Default is empty string. */ public function output_selector_vars( $selector, $vars, $style_id = '', $form_id = '' ) { if ( empty( $this->render_engine ) ) { $this->render_engine = wpforms_get_render_engine(); } if ( $this->render_engine === 'classic' ) { return; } $style_id = empty( $style_id ) ? 'wpforms-css-vars-' . $selector : $style_id; printf( '<style id="%1$s"> %2$s { %3$s } </style>', sanitize_key( $style_id ), $selector, // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped esc_html( $this->get_vars_css( $vars, $form_id ) ) ); } /** * Pre print vars filter. * * @since 1.8.8 * * @param array $vars Variables data. * @param string|int $form_id Form ID. Optional. Default is empty string. * * @return array */ private function get_pre_print_vars( array $vars, $form_id = '' ): array { // Normalize the `background-url` variable. if ( isset( $vars['background-url'] ) ) { $vars['background-url'] = $vars['background-url'] === 'url()' ? 'none' : $vars['background-url']; } /** * Filter CSS variables right before printing the CSS. * * @since 1.8.8 * * @param array $vars CSS variables. * @param int $form_id Form ID. Optional. Default is empty string. */ return (array) apply_filters( 'wpforms_frontend_css_vars_pre_print_filter', $vars, $form_id ); } /** * Generate CSS code from given vars data. * * @since 1.8.1 * * @param array $vars Variables data. * @param string|int $form_id Form ID. Optional. Default is empty string. */ private function get_vars_css( $vars, $form_id = '' ): string { $vars = $this->get_pre_print_vars( (array) $vars, $form_id ); $result = ''; foreach ( $vars as $name => $value ) { if ( $value === '0' ) { $value = '0px'; } $result .= "--wpforms-{$name}: {$value};\n"; if ( in_array( $name, self::SPARE_VARS, true ) ) { $result .= "--wpforms-{$name}-spare: {$value};\n"; } } return $result; } /** * Get customized CSS vars. * * @since 1.8.3 * * @param array $attr Attributes passed by integration. * * @return array */ public function get_customized_css_vars( $attr ): array { // phpcs:ignore Generic.Metrics.CyclomaticComplexity.MaxExceeded $root_css_vars = $this->get_vars( ':root' ); $css_vars = []; foreach ( $attr as $key => $value ) { $var_name = strtolower( preg_replace( '/[A-Z]/', '-$0', $key ) ); // Skip attribute that is not the CSS var or has the default value. if ( empty( $root_css_vars[ $var_name ] ) || $root_css_vars[ $var_name ] === $value ) { continue; } $css_vars[ $var_name ] = $value; } // Reset border size in case of border style is `none`. if ( isset( $css_vars['field-border-style'] ) && $css_vars['field-border-style'] === 'none' ) { $css_vars['field-border-size'] = '0px'; } if ( isset( $css_vars['button-border-style'] ) && $css_vars['button-border-style'] === 'none' ) { $css_vars['button-border-size'] = '0px'; } // Set the button alternative background color and use border color for accent in case of transparent color. $button_bg_color = $css_vars['button-background-color'] ?? $root_css_vars['button-background-color']; if ( $this->is_transparent_color( $button_bg_color ) ) { $css_vars['button-background-color-alt'] = $button_bg_color; $border_color = $css_vars['button-border-color'] ?? $root_css_vars['button-border-color']; $css_vars['button-background-color'] = $this->is_transparent_color( $border_color ) ? $root_css_vars['button-background-color'] : $border_color; $button_bg_color = $css_vars['button-background-color']; } $button_bg_color = strtolower( $button_bg_color ); // Set the button alternative text color in case if the background and text color are identical. $button_text_color = strtolower( $css_vars['button-text-color'] ?? $root_css_vars['button-text-color'] ); if ( $button_bg_color === $button_text_color || $this->is_transparent_color( $button_text_color ) ) { $css_vars['button-text-color-alt'] = $this->get_contrast_color( $button_bg_color ); } $size_css_vars = $this->get_size_css_vars( $attr ); return array_merge( $css_vars, $size_css_vars ); } /** * Checks if the provided color has transparency. * * @since 1.8.8 * * @param string $color The color to check. * * @return bool */ private function is_transparent_color( $color ): bool { $rgba = $this->get_color_as_rgb_array( $color ); $opacity_threshold = 0.33; $opacity = $rgba[3] ?? 1; return $opacity < $opacity_threshold; } /** * Get contrast color relative to given color. * * @since 1.8.8 * * @param string|array $color The color. * * @return string */ private function get_contrast_color( $color ): string { $rgba = is_array( $color ) ? $color : $this->get_color_as_rgb_array( $color ); $avg = (int) ( ( ( array_sum( $rgba ) ) / 3 ) * ( $rgba[3] ?? 1 ) ); return $avg < 128 ? '#ffffff' : '#000000'; } /** * Get size CSS vars. * * @since 1.8.3 * @since 1.8.8 Removed $css_vars argument. * * @param array $attr Attributes passed by integration. * * @return array */ private function get_size_css_vars( array $attr ): array { $size_items = [ 'field', 'label', 'button', 'container-shadow' ]; $size_css_vars = []; foreach ( $size_items as $item ) { $item_attr = preg_replace_callback( '/-(\w)/', static function ( $matches ) { return strtoupper( $matches[1] ); }, $item ); $item_attr .= 'Size'; $item_key = $item . '-size'; $item_constant = 'self::' . str_replace( '-', '_', strtoupper( $item ) ) . '_SIZE'; if ( empty( $attr[ $item_attr ] ) ) { continue; } $size_css_vars[] = $this->get_complex_vars( $item_key, constant( $item_constant )[ $attr[ $item_attr ] ] ); } return empty( $size_css_vars ) ? [] : array_merge( ...$size_css_vars ); } /** * Get color as an array of RGB(A) values. * * @since 1.8.8 * * @param string $color Color. * * @return array|bool Color as an array of RGBA values. False on error. */ private function get_color_as_rgb_array( $color ) { // Remove # from the beginning of the string and remove whitespaces. $color = preg_replace( '/^#/', '', strtolower( trim( $color ) ) ); $color = str_replace( ' ', '', $color ); if ( $color === 'transparent' ) { $color = 'rgba(0,0,0,0)'; } $rgba = $color; $rgb_array = []; // Check if color is in HEX(A) format. $is_hex = preg_match( '/[0-9a-f]{6,8}$/', $rgba ); if ( $is_hex ) { // Search and split HEX(A) color into an array of couples of chars. preg_match_all( '/\w\w/', $rgba, $rgb_array ); $rgb_array = array_map( static function ( $value ) { return hexdec( '0x' . $value ); }, $rgb_array[0] ?? [] ); $rgb_array[3] = ( $rgb_array[3] ?? 255 ) / 255; } else { $rgba = preg_replace( '/[^\d,.]/', '', $rgba ); $rgb_array = explode( ',', $rgba ); } return $rgb_array; } }
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