455 lines
14 KiB
PHP
455 lines
14 KiB
PHP
<?php
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/*
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Plugin Name: Presentations
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Plugin URI: http://automattic.com/wordpress-plugins/
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Description: Presentations plugin based on the work done by <a href="http://darylkoop.com/">Daryl Koopersmith</a>. Powered by jmpress.js
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Version: 0.2
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Author: Automattic
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Author URI: http://automattic.com/wordpress-plugins/
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* Known issues:
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*
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* - IE 7/8 are not supported by jmpress and presentations will not work
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* - IE 9 will not animate transitions at all, though it's possible to at least
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* switch between slides.
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* - Infinite Scroll themes will not load presentations properly unless the post
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* happens to be on the first loaded page. The permalink page will function
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* properly, however.
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* - Exiting fullscreen mode will not properly reset the scroll locations in Safari
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*/
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/*
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HOW TO: How the plugin settings are organized and which features are supported.
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The entire presentation should be wrapped with a [presentation] shortcode, and every
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individual slide should be wrapped with a [slide] shortcode. Any settings supported
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by [slide] can be set into [presentation], which will apply that setting for the entire
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presentation unless overridden by individual slides.
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- [presentation] only settings:
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- duration: transition durations, default is one second.
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- height: content height, default is 400px
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- width: content width, default is 550px
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- autoplay: delay between transitions in seconds, default 3s
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when set the presentation will automatically transition between slides
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as long as the presentation remains in focus
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- [slide] settings:
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- transition: specifies where the next slide will be placed relative
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to the last one before it. Supported values are "up", "down"
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"left", "right", or "none". Default value is "down".
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- scale: scales the content relative to other slides, default value is one
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- rotate: rotates the content by the specified degrees, default is zero
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- fade: slides will fade in and out during transition. Values of "on" or
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"true" will enable fading, while values of "no" or "false" will
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disable it. Default value is "on"
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- bgcolor: specifies a background color for the slides. Any CSS valid value
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is permitted. Default color is transparent.
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- bgimg: specifies an image url which will fill the background. Image is
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set to fill the background 100% width and height
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- fadebullets: any html <li> tags will start out with an opacity of 0 and any
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subsequent slide transitions will show the bullets one by one
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*/
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if ( ! class_exists( 'Presentations' ) ) :
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class Presentations {
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private $presentation_settings;
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private $presentation_initialized;
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private $scripts_and_style_included;
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/**
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* Constructor
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*/
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function __construct() {
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// Bail without 3.0.
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if ( ! function_exists( '__return_false' ) ) {
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return;
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}
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$this->presentation_initialized = false;
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$this->scripts_and_style_included = false;
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// Registers shortcodes
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add_action( 'wp_head', array( &$this, 'add_scripts' ), 1 );
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add_shortcode( 'presentation', array( &$this, 'presentation_shortcode' ) );
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add_shortcode( 'slide', array( &$this, 'slide_shortcode' ) );
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}
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function add_scripts() {
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$this->scripts_and_style_included = false;
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if ( empty( $GLOBALS['posts'] ) || ! is_array( $GLOBALS['posts'] ) ) {
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return;
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}
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foreach ( $GLOBALS['posts'] as $p ) {
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if ( has_shortcode( $p->post_content, 'presentation' ) ) {
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$this->scripts_and_style_included = true;
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break;
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}
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}
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if ( ! $this->scripts_and_style_included ) {
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return;
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}
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$plugin = plugin_dir_url( __FILE__ );
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// Add CSS
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wp_enqueue_style( 'presentations', $plugin . 'css/style.css' );
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// Add JavaScript
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wp_enqueue_script( 'jquery' );
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wp_enqueue_script( 'jmpress', $plugin . 'js/jmpress.min.js', array( 'jquery' ), '0.4.5', true );
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wp_enqueue_script( 'presentations', $plugin . 'js/main.js', array( 'jquery', 'jmpress' ), false, true );
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}
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function presentation_shortcode( $atts, $content = '' ) {
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// Mark that we've found a valid [presentation] shortcode
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$this->presentation_initialized = true;
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$atts = shortcode_atts(
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array(
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'duration' => '',
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'height' => '',
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'width' => '',
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'bgcolor' => '',
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'bgimg' => '',
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'autoplay' => '',
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// Settings
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'transition' => '',
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'scale' => '',
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'rotate' => '',
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'fade' => '',
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'fadebullets' => '',
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), $atts, 'presentation'
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);
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$this->presentation_settings = array(
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'transition' => 'down',
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'scale' => 1,
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'rotate' => 0,
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'fade' => 'on',
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'fadebullets' => 0,
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'last' => array(
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'x' => 0,
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'y' => 0,
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'scale' => 1,
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'rotate' => 0,
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),
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);
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// Set the presentation-wide settings
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if ( '' != trim( $atts['transition'] ) ) {
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$this->presentation_settings['transition'] = $atts['transition'];
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}
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if ( '' != trim( $atts['scale'] ) ) {
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$this->presentation_settings['scale'] = floatval( $atts['scale'] );
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}
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if ( '' != trim( $atts['rotate'] ) ) {
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$this->presentation_settings['rotate'] = floatval( $atts['rotate'] );
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}
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if ( '' != trim( $atts['fade'] ) ) {
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$this->presentation_settings['fade'] = $atts['fade'];
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}
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if ( '' != trim( $atts['fadebullets'] ) ) {
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$this->presentation_settings['fadebullets'] = $atts['fadebullets'];
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}
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// Set any settings the slides don't care about
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if ( '' != trim( $atts['duration'] ) ) {
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$duration = floatval( $atts['duration'] ) . 's';
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} else {
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$duration = '1s';
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}
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// Autoplay durations are set in milliseconds
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if ( '' != trim( $atts['autoplay'] ) ) {
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$autoplay = floatval( $atts['autoplay'] ) * 1000;
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} else {
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$autoplay = 0;
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} // No autoplay
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// Set the presentation size as specified or with some nicely sized dimensions
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if ( '' != trim( $atts['width'] ) ) {
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$this->presentation_settings['width'] = intval( $atts['width'] );
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} else {
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$this->presentation_settings['width'] = 480;
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}
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if ( '' != trim( $atts['height'] ) ) {
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$this->presentation_settings['height'] = intval( $atts['height'] );
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} else {
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$this->presentation_settings['height'] = 370;
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}
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// Hide the content by default in case the scripts fail
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$style = 'display: none; width: ' . $this->presentation_settings['width'] . 'px; height: ' . $this->presentation_settings['height'] . 'px;';
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// Check for background color XOR background image
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// Use a white background if nothing specified
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if ( preg_match( '/https?\:\/\/[^\'"\s]*/', $atts['bgimg'], $matches ) ) {
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$style .= ' background-image: url("' . esc_url( $matches[0] ) . '");';
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} else if ( '' != trim( $atts['bgcolor'] ) ) {
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$style .= ' background-color: ' . esc_attr( $atts['bgcolor'] ) . ';';
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} else {
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$style .= ' background-color: #fff;';
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}
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// Not supported message style is inlined incase the style sheet doesn't get included
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$out = "<section class='presentation-wrapper'>";
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$out .= "<p class='not-supported-msg' style='display: inherit; padding: 25%; text-align: center;'>";
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$out .= __( 'This slideshow could not be started. Try refreshing the page or viewing it in another browser.', 'jetpack' ) . '</p>';
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// Bail out unless the scripts were added
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if ( $this->scripts_and_style_included ) {
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$out .= sprintf(
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'<div class="presentation" duration="%s" data-autoplay="%s" style="%s">',
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esc_attr( $duration ),
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esc_attr( $autoplay ),
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esc_attr( $style )
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);
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$out .= "<div class='nav-arrow-left'></div>";
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$out .= "<div class='nav-arrow-right'></div>";
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$out .= "<div class='nav-fullscreen-button'></div>";
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if ( $autoplay ) {
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$out .= '<div class="autoplay-overlay" style="display: none;"><p class="overlay-msg">';
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$out .= __( 'Click to autoplay the presentation!', 'jetpack' );
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$out .= '</p></div>';
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}
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$out .= do_shortcode( $content );
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}
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$out .= '</section>';
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$this->presentation_initialized = false;
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return $out;
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}
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function slide_shortcode( $atts, $content = '' ) {
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// Bail out unless wrapped by a [presentation] shortcode
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if ( ! $this->presentation_initialized ) {
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return $content;
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}
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$atts = shortcode_atts(
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array(
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'transition' => '',
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'scale' => '',
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'rotate' => '',
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'fade' => '',
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'fadebullets' => '',
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'bgcolor' => '',
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'bgimg' => '',
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), $atts, 'slide'
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);
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// Determine positioning based on transition
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if ( '' == trim( $atts['transition'] ) ) {
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$atts['transition'] = $this->presentation_settings['transition'];
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}
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// Setting the content scale
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if ( '' == trim( $atts['scale'] ) ) {
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$atts['scale'] = $this->presentation_settings['scale'];
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}
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if ( '' == trim( $atts['scale'] ) ) {
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$scale = 1;
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} else {
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$scale = floatval( $atts['scale'] );
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}
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if ( $scale < 0 ) {
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$scale *= -1;
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}
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// Setting the content rotation
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if ( '' == trim( $atts['rotate'] ) ) {
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$atts['rotate'] = $this->presentation_settings['rotate'];
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}
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if ( '' == trim( $atts['rotate'] ) ) {
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$rotate = 0;
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} else {
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$rotate = floatval( $atts['rotate'] );
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}
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// Setting if the content should fade
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if ( '' == trim( $atts['fade'] ) ) {
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$atts['fade'] = $this->presentation_settings['fade'];
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}
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if ( 'on' == $atts['fade'] || 'true' == $atts['fade'] ) {
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$fade = 'fade';
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} else {
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$fade = '';
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}
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// Setting if bullets should fade on step changes
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if ( '' == trim( $atts['fadebullets'] ) ) {
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$atts['fadebullets'] = $this->presentation_settings['fadebullets'];
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}
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if ( 'on' == $atts['fadebullets'] || 'true' == $atts['fadebullets'] ) {
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$fadebullets = 'fadebullets';
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} else {
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$fadebullets = '';
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}
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$coords = $this->get_coords(
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array(
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'transition' => $atts['transition'],
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'scale' => $scale,
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'rotate' => $rotate,
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)
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);
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$x = $coords['x'];
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$y = $coords['y'];
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// Check for background color XOR background image
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// Use a white background if nothing specified
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if ( preg_match( '/https?\:\/\/[^\'"\s]*/', $atts['bgimg'], $matches ) ) {
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$style = 'background-image: url("' . esc_url( $matches[0] ) . '");';
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} else if ( '' != trim( $atts['bgcolor'] ) ) {
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$style = 'background-color: ' . esc_attr( $atts['bgcolor'] ) . ';';
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} else {
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$style = '';
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}
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// Put everything together and let jmpress do the magic!
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$out = sprintf(
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'<div class="step %s %s" data-x="%s" data-y="%s" data-scale="%s" data-rotate="%s" style="%s">',
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esc_attr( $fade ),
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esc_attr( $fadebullets ),
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esc_attr( $x ),
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esc_attr( $y ),
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esc_attr( $scale ),
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esc_attr( $rotate ),
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esc_attr( $style )
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);
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$out .= '<div class="slide-content">';
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$out .= do_shortcode( $content );
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$out .= '</div></div>';
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return $out;
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}
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/**
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* Determines the position of the next slide based on the position and scaling of the previous slide.
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*
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* @param array $args : an array with the following key-value pairs
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* string $transition: the transition name, "up", "down", "left", or "right"
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* float $scale: the scale of the next slide (used to determine the position of the slide after that)
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*
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* @return array with the 'x' and 'y' coordinates of the slide
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*/
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function get_coords( $args ) {
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if ( 0 == $args['scale'] ) {
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$args['scale'] = 1;
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}
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$width = $this->presentation_settings['width'];
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$height = $this->presentation_settings['height'];
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$last = $this->presentation_settings['last'];
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$scale = $last['scale'];
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$next = array(
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'x' => $last['x'],
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'y' => $last['y'],
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'scale' => $args['scale'],
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'rotate' => $args['rotate'],
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);
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// All angles are measured from the vertical axis, so everything is backwards!
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$diagAngle = atan2( $width, $height );
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$diagonal = sqrt( pow( $width, 2 ) + pow( $height, 2 ) );
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// We offset the angles by the angle formed by the diagonal so that
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// we can multiply the sines directly against the diagonal length
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$theta = deg2rad( $last['rotate'] ) - $diagAngle;
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$phi = deg2rad( $next['rotate'] ) - $diagAngle;
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// We start by displacing by the slide dimensions
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$totalHorizDisp = $width * $scale;
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$totalVertDisp = $height * $scale;
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// If the previous slide was rotated, we add the incremental offset from the rotation
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// Namely the difference between the regular dimension (no rotation) and the component
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// of the diagonal for that angle
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$totalHorizDisp += ( ( ( abs( sin( $theta ) ) * $diagonal ) - $width ) / 2 ) * $scale;
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$totalVertDisp += ( ( ( abs( cos( $theta ) ) * $diagonal ) - $height ) / 2 ) * $scale;
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// Similarly, we check if the current slide has been rotated and add whatever additional
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// offset has been added. This is so that two rotated corners don't clash with each other.
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// Note: we are checking the raw angle relative to the vertical axis, NOT the diagonal angle.
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if ( 0 !== $next['rotate'] % 180 ) {
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$totalHorizDisp += ( abs( ( sin( $phi ) * $diagonal ) - $width ) / 2 ) * $next['scale'];
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$totalVertDisp += ( abs( ( cos( $phi ) * $diagonal ) - $height ) / 2 ) * $next['scale'];
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}
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switch ( trim( $args['transition'] ) ) {
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case 'none':
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break;
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case 'left':
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$next['x'] -= $totalHorizDisp;
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break;
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case 'right':
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$next['x'] += $totalHorizDisp;
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break;
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case 'up':
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$next['y'] -= $totalVertDisp;
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break;
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case 'down':
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default:
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$next['y'] += $totalVertDisp;
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break;
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}
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$this->presentation_settings['last'] = $next;
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return $next;
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}
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}
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$GLOBALS['presentations'] = new Presentations();
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endif;
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