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<?php
namespace WPForms\Frontend;
/**
* CSS variables class.
*
* @since 1.8.1
*/
class CSSVars {
/**
* Root vars and values.
*
* @since 1.8.1
*
* @var array
*/
const ROOT_VARS = [
'field-border-radius' => '3px',
'field-background-color' => '#ffffff',
'field-border-color' => 'rgba( 0, 0, 0, 0.25 )',
'field-text-color' => 'rgba( 0, 0, 0, 0.7 )',
'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-background-color' => '#066aab',
'button-text-color' => '#ffffff',
];
/**
* 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',
],
];
/**
* 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'] )
);
/**
* 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 ) {
$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 ) {
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. Defaults to empty string.
*/
public function output_selector_vars( $selector, $vars, $style_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 ) )
);
}
/**
* Generate CSS code from given vars data.
*
* @since 1.8.1
*
* @param array $vars Variables data.
*/
private function get_vars_css( $vars ) {
$result = '';
foreach ( $vars as $name => $value ) {
$result .= "--wpforms-{$name}: {$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 ) {
$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;
}
$css_vars = array_merge(
$css_vars,
$this->get_size_css_vars( $attr, $css_vars )
);
return $css_vars;
}
/**
* Get size CSS vars.
*
* @since 1.8.3
*
* @param array $attr Attributes passed by integration.
* @param array $css_vars Current CSS vars.
*
* @return array
*/
private function get_size_css_vars( $attr, $css_vars ) {
$size_items = [ 'field', 'label', 'button' ];
foreach ( $size_items as $item ) {
$item_attr = $item . 'Size';
$item_key = $item . '-size';
$item_constant = 'self::' . strtoupper( $item ) . '_SIZE';
if ( empty( $attr[ $item_attr ] ) ) {
continue;
}
$css_vars += $this->get_complex_vars( $item_key, constant( $item_constant )[ $attr[ $item_attr ] ] );
}
return $css_vars;
}
}
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