Home > php教程 > php手册 > elgg 获取文件图标地址的方法

elgg 获取文件图标地址的方法

WBOY
Release: 2016-06-06 20:33:19
Original
1572 people have browsed it

elgg本身有一套模板系统,可以加载图标。但是如果自己写了新的模板,怎样获得img的src地址呢?

过程如下:
首先,实体保存的时候用这个方法(系统本身的):
比如有一个Activity类,继承自ElggObject,创建了一个它的实例 activity,
代码如下:
// Now see if we have a file icon
if ((isset($_FILES['icon'])) && (substr_count($_FILES['icon']['type'],'image/'))) {
$prefix = "activity/".$activity->guid;
$filehandler = new ElggFile();
$filehandler->owner_guid = $activity->owner_guid;
$filehandler->setFilename($prefix . ".jpg");
$filehandler->open("write");
$filehandler->write(get_uploaded_file('icon'));
$filehandler->close();
$thumbtiny = get_resized_image_from_existing_file($filehandler->getFilenameOnFilestore(),25,25, true);
$thumbsmall = get_resized_image_from_existing_file($filehandler->getFilenameOnFilestore(),40,40, true);
$thumbmedium = get_resized_image_from_existing_file($filehandler->getFilenameOnFilestore(),100,100, true);
$thumblarge = get_resized_image_from_existing_file($filehandler->getFilenameOnFilestore(),200,200, false);
if ($thumbtiny) {
$thumb = new ElggFile();
$thumb->owner_guid = $activity->owner_guid;
$thumb->setMimeType('image/jpeg');
$thumb->setFilename($prefix."tiny.jpg");
$thumb->open("write");
$thumb->write($thumbtiny);
$thumb->close();
$thumb->setFilename($prefix."small.jpg");
$thumb->open("write");
$thumb->write($thumbsmall);
$thumb->close();
$thumb->setFilename($prefix."medium.jpg");
$thumb->open("write");
$thumb->write($thumbmedium);
$thumb->close();
$thumb->setFilename($prefix."large.jpg");
$thumb->open("write");
$thumb->write($thumblarge);
$thumb->close();
}
}

这个过程后,文件将被保存至一个由用户名字符串组成的一个目录结构下,比如用户名是abc,则被保存在了a/b/c/下,然后由图片的guid+size+.jpg组成一个文件名。
获取src地址的时候,通过实体->getIcon();方法来获取。getIcon是entities.php中的方法。然后这个方法会调用get_entity_icon_url方法,在get_entity_icon_url方法中有一行:
$url = trigger_plugin_hook('entity:icon:url', $entity->getType(), array('entity' => $entity, 'viewtype' => $viewtype, 'size' => $size), $url);
它会触发一个钩子(hook),这个hood需要在插件的start.php中注册。注册时这样写:
register_plugin_hook('entity:icon:url', 'object', 'activity_activityicon_hook');
第一个参数是钩子类型,第二个是实体类型,也就是activity的类型,第三个是钩子函数名。
然后在start.php中写出activity_activityicon_hook方法:
代码如下:
/**
* 获取图标
* This hooks into the getIcon API and provides nice user icons for users where possible.
*
* @param string $hook 钩子名
* @param string $entity_type 实体类型
* @param string $returnvalue 图片url地址
* @param unknow $params 参数表列
* @return string $url 图片url地址
*/
function activity_activityicon_hook($hook, $entity_type, $returnvalue, $params) {
global $CONFIG;
if ((!$returnvalue) && ($hook == 'entity:icon:url') && ($params['entity'] instanceof Activity)) {
$entity = $params['entity'];
$type = $entity->type;
$viewtype = $params['viewtype'];
$size = $params['size'];
if ($icontime = $entity->icontime) {
$icontime = "{$icontime}";
} else {
$icontime = "default";
}
$filehandler = new ElggFile();
$filehandler->owner_guid = $entity->owner_guid;
$filehandler->setFilename("activity/" . $entity->guid . $size . ".jpg");
if ($filehandler->exists()) {
$url = $CONFIG->url . "pg/activityicon/{$entity->guid}/$size/$icontime.jpg";
return $url;
}
}
}

这个方法会返回一个url,这个url就是src的地址。url返回到get_entity_icon_url后,会根据图片尺寸继续加工,返回最终url。这样就获取到了src地址。
Related labels:
source:php.cn
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Popular Recommendations
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template