让typecho后台支持批量插入附件和预览

吐槽：系统自带的附件上传功能，上传成功了居然没有预览，然后插入文中也要1个1个的插入，一点都不人性化。这点用户体验不佳啊。所以百度找找有没有什么插件解决的。
功夫不负有心人啊，终于被我找到了。

本文转载于【老孙博客】，原文地址：https://www.imsun.org/archives/1735.html

在主题的functions.php最后插入以下代码：

/**
 * Typecho后台附件增强：图片预览、批量插入、保留官方删除按钮与逻辑
 * @author jkjoy
 * @date 2025-04-25
 */
Typecho_Plugin::factory('admin/write-post.php')->bottom = array('AttachmentHelper', 'addEnhancedFeatures');
Typecho_Plugin::factory('admin/write-page.php')->bottom = array('AttachmentHelper', 'addEnhancedFeatures');

class AttachmentHelper {
    public static function addEnhancedFeatures() {
        ?>
        <style>
        #file-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:15px;padding:15px;list-style:none;margin:0;}
        #file-list li{position:relative;border:1px solid #e0e0e0;border-radius:4px;padding:10px;background:#fff;transition:all 0.3s ease;list-style:none;margin:0;}
        #file-list li:hover{box-shadow:0 2px 8px rgba(0,0,0,0.1);}
        #file-list li.loading{opacity:0.7;pointer-events:none;}
        .att-enhanced-thumb{position:relative;width:100%;height:150px;margin-bottom:8px;background:#f5f5f5;overflow:hidden;border-radius:3px;display:flex;align-items:center;justify-content:center;}
        .att-enhanced-thumb img{width:100%;height:100%;object-fit:contain;display:block;}
        .att-enhanced-thumb .file-icon{display:flex;align-items:center;justify-content:center;width:100%;height:100%;font-size:40px;color:#999;}
        .att-enhanced-finfo{padding:5px 0;}
        .att-enhanced-fname{font-size:13px;margin-bottom:5px;word-break:break-all;color:#333;}
        .att-enhanced-fsize{font-size:12px;color:#999;}
        .att-enhanced-factions{display:flex;justify-content:space-between;align-items:center;margin-top:8px;gap:8px;}
        .att-enhanced-factions button{flex:1;padding:4px 8px;border:none;border-radius:3px;background:#e0e0e0;color:#333;cursor:pointer;font-size:12px;transition:all 0.2s ease;}
        .att-enhanced-factions button:hover{background:#d0d0d0;}
        .att-enhanced-factions .btn-insert{background:#467B96;color:white;}
        .att-enhanced-factions .btn-insert:hover{background:#3c6a81;}
        .att-enhanced-checkbox{position:absolute;top:5px;right:5px;z-index:2;width:18px;height:18px;cursor:pointer;}
        .batch-actions{margin:15px;display:flex;gap:10px;align-items:center;}
        .btn-batch{padding:8px 15px;border-radius:4px;border:none;cursor:pointer;transition:all 0.3s ease;font-size:10px;display:inline-flex;align-items:center;justify-content:center;}
        .btn-batch.primary{background:#467B96;color:white;}
        .btn-batch.primary:hover{background:#3c6a81;}
        .btn-batch.secondary{background:#e0e0e0;color:#333;}
        .btn-batch.secondary:hover{background:#d0d0d0;}
        .upload-progress{position:absolute;bottom:0;left:0;width:100%;height:2px;background:#467B96;transition:width 0.3s ease;}
        </style>
        <script>
        $(document).ready(function() {
            // 批量操作UI按钮
            var $batchActions = $('<div class="batch-actions"></div>')
                .append('<button type="button" class="btn-batch primary" id="batch-insert">批量插入</button>')
                .append('<button type="button" class="btn-batch secondary" id="select-all">全选</button>')
                .append('<button type="button" class="btn-batch secondary" id="unselect-all">取消全选</button>');
            $('#file-list').before($batchActions);

            // 插入格式
            Typecho.insertFileToEditor = function(title, url, isImage) {
                var textarea = $('#text'), 
                    sel = textarea.getSelection(),
                    insertContent = isImage ? '![' + title + '](' + url + ')' : 
                                            '[' + title + '](' + url + ')';
                textarea.replaceSelection(insertContent + '\n');
                textarea.focus();
            };

            // 批量插入
            $('#batch-insert').on('click', function(e) {
                e.preventDefault();
                e.stopPropagation();
                var content = '';
                $('#file-list li').each(function() {
                    if ($(this).find('.att-enhanced-checkbox').is(':checked')) {
                        var $li = $(this);
                        var title = $li.find('.att-enhanced-fname').text();
                        var url = $li.data('url');
                        var isImage = $li.data('image') == 1;
                        content += isImage ? '![' + title + '](' + url + ')\n' : '[' + title + '](' + url + ')\n';
                    }
                });
                if (content) {
                    var textarea = $('#text');
                    var pos = textarea.getSelection();
                    var newContent = textarea.val();
                    newContent = newContent.substring(0, pos.start) + content + newContent.substring(pos.end);
                    textarea.val(newContent);
                    textarea.focus();
                }
            });

            $('#select-all').on('click', function(e) {
                e.preventDefault();
                e.stopPropagation();
                $('#file-list .att-enhanced-checkbox').prop('checked', true);
                return false;
            });
            $('#unselect-all').on('click', function(e) {
                e.preventDefault();
                e.stopPropagation();
                $('#file-list .att-enhanced-checkbox').prop('checked', false);
                return false;
            });

            // 防止复选框冒泡
            $(document).on('click', '.att-enhanced-checkbox', function(e) {e.stopPropagation();});

            // 增强文件列表样式，但不破坏li原结构和官方按钮
            function enhanceFileList() {
                $('#file-list li').each(function() {
                    var $li = $(this);
                    if ($li.hasClass('att-enhanced')) return;
                    $li.addClass('att-enhanced');
                    // 只增强，不清空li
                    // 增加批量选择框
                    if ($li.find('.att-enhanced-checkbox').length === 0) {
                        $li.prepend('<input type="checkbox" class="att-enhanced-checkbox" />');
                    }
                    // 增加图片预览（如已有则不重复加）
                    if ($li.find('.att-enhanced-thumb').length === 0) {
                        var url = $li.data('url');
                        var isImage = $li.data('image') == 1;
                        var fileName = $li.find('.insert').text();
                        var $thumbContainer = $('<div class="att-enhanced-thumb"></div>');
                        if (isImage) {
                            var $img = $('<img src="' + url + '" alt="' + fileName + '" />');
                            $img.on('error', function() {
                                $(this).replaceWith('<div class="file-icon">🖼️</div>');
                            });
                            $thumbContainer.append($img);
                        } else {
                            $thumbContainer.append('<div class="file-icon">📄</div>');
                        }
                        // 插到插入按钮之前
                        $li.find('.insert').before($thumbContainer);
                    }

                });
            }

            // 插入按钮事件
            $(document).on('click', '.btn-insert', function(e) {
                e.preventDefault();
                e.stopPropagation();
                var $li = $(this).closest('li');
                var title = $li.find('.att-enhanced-fname').text();
                Typecho.insertFileToEditor(title, $li.data('url'), $li.data('image') == 1);
            });

            // 上传完成后增强新项
            var originalUploadComplete = Typecho.uploadComplete;
            Typecho.uploadComplete = function(attachment) {
                setTimeout(function() {
                    enhanceFileList();
                }, 200);
                if (typeof originalUploadComplete === 'function') {
                    originalUploadComplete(attachment);
                }
            };

            // 首次增强
            enhanceFileList();
        });
        </script>
        <?php
    }
}
?>