All images must have an alternate text.

[squirrelmail.git] / functions / template / general_util.php

<?php

/**
 * general_util.php
 *
 * This file is intended to contain helper functions for template sets
 * that would like to use them.
 *
 * @copyright &copy; 1999-2006 The SquirrelMail Project Team
 * @license http://opensource.org/licenses/gpl-license.php GNU Public License
 * @version $Id$
 * @package squirrelmail
 */


/**
  * Create stylesheet links that will work for multiple browsers
  *
  * @param string  $uri       The URI to the linked stylesheet.
  * @param string  $name      The title of the stylesheet (optional; default empty).
  * @param boolean $alt       Whether or not this is an alternate 
  *                           stylesheet (optional; default TRUE).
  * @param string  $mtype     The target media display type (optional; default "screen").
  *
  * @return string The full text of the stylesheet link.
  *
  */
function create_css_link($uri, $name='', $alt=TRUE, $mtype='screen') {
// FIXME: Add closing / to link and meta elements only after 
//        switching to xhtml 1.0 Transitional.
//        It is not compatible with html 4.01 Transitional
    if (empty($uri)) {
        return '';
    }

    // set to lower case to avoid errors
    //
    sqGetGlobalVar('HTTP_USER_AGENT', $browser_user_agent, SQ_SERVER);
    $browser_user_agent = strtolower($browser_user_agent);

    if (stristr($browser_user_agent, "msie 4")) {
        $browser = 'msie4';
        $dom_browser = false;
        $is_IE = true;
    } elseif (stristr($browser_user_agent, "msie") 
           && stristr($browser_user_agent, 'opera') === FALSE) {
        $browser = 'msie';
        $dom_browser = true;
        $is_IE = true;
    }

    if ((strpos($uri, '-ie')!== false) and !$is_IE) {
        //not IE, so don't render this sheet
        return;
    }

    if ( strpos($uri, 'print') !== false )
        $mtype = 'print';

    $href  = 'href="'.$uri.'" ';
    $media = 'media="'.$mtype.'" ';

    if ( empty($name) ) {
        $title = '';
        $rel   = 'rel="stylesheet" ';
    } else {
        $title = 'title="'.$name.'" ';
        $rel   = 'rel="'.( $alt ? 'alternate ' : '' ).'stylesheet" ';
    }

    return '<link '.$media.$title.$rel.'type="text/css" '.$href." />\n";
}


/**
 * Checks for an image icon and returns a complete image tag or a text
 * string with the text icon based on what is found and user prefs.
 *
 * @param string $icon_theme_path User's chosen icon set
 * @param string $icon_name File name of the desired icon
 * @param string $text_icon Text-based icon to display if desired
 * @param string $alt_text Text for alt/title attribute of image
 * @param integer $w Optional.  Width of requested image.
 * @param integer $h Optional.  Height of requested image.
 *
 * @return string $icon String containing icon that can be echo'ed
 *
 * @author Steve Brown
 * @since 1.5.2
 */
function getIcon($icon_theme_path, $icon_name, $text_icon, $alt_text, $w=NULL, $h=NULL) {
    $icon = '';
    if (is_null($icon_theme_path)) {
        $icon = $text_icon;
    } else {
        $icon_path = getIconPath($icon_theme_path, $icon_name);

        // If we found an icon, build an img tag to display it.  If we didn't
        // find an image, we will revert back to the text icon.
        if (!is_null($icon_path)) {
            $icon = create_image($icon_path, $alt_text, $w, $h, '', '', '', 
                                 '', $alt_text, '', '', '', $text_icon);
        } else {
            $icon = $text_icon;
        }
    }
    return $icon;
}


/**
 * Gets the path to the specified icon or returns NULL if the image is not
 * found.  This has been separated from getIcon to allow the path to be fetched
 * for use w/ third party packages, e.g. dTree.
 *
 * @param string $icon_theme_path User's chosen icon set
 * @param string $icon_name File name of the desired icon
 *
 * @return string $icon String containing path to icon that can be used in
 *                      an IMG tag, or NULL if the image is not found.
 *
 * @author Steve Brown
 * @since 1.5.2
 *
 */
function getIconPath ($icon_theme_path, $icon_name) {
    global $fallback_icon_theme_path;

    if (is_null($icon_theme_path))
        return NULL;

    // Desired icon exists in the current theme?
    if (is_file($icon_theme_path . $icon_name)) {
        return $icon_theme_path . $icon_name;

    // Icon not found, check for the admin-specified fallback
    } elseif (!is_null($fallback_icon_theme_path) && is_file($fallback_icon_theme_path . $icon_name)) {
        return $fallback_icon_theme_path . $icon_name;

    // Icon not found, return the SQM default icon
    } elseif (is_file(SM_PATH . 'images/themes/default/'.$icon_name)) {
        return SM_PATH . 'images/themes/default/'.$icon_name;
    }

    return NULL;
}


/**
 * Display error messages for use in footer.tpl
 *
 * @author Steve Brown
 * @since 1.5.2
 **/
function displayErrors () {
    global $oErrorHandler;

    if ($oErrorHandler) {
        $oErrorHandler->displayErrors();
    }
}


/**
 * Make the internal show_readable_size() function available to templates.
//FIXME: I think this is needless since there is no reason templates cannot just call directly to show_readable_size
 *
 * @param int size to be converted to human-readable
 * @return string human-readable form
 * @since 1.5.2
 **/
function humanReadableSize ($size) {
    return show_readable_size($size);
}