/**
 * 手写签名栏，放在表单的<h1>标签前
 * 例如：<boe:signature bean="${xxxxInstance}" />
 * @attr bean REQUIRED
 */
def signature = {attrs->
   if ( !attrs.bean?.id ) return;
    ProcessInstance flowInst = attrs.bean.workflowInstance;
   def proc = flowInst.processDefinition();
   // 流程处于起草状态时，不显示签名
   if ( flowInst.startNode() == flowInst.nodesName ) return;
   //
   List tasks = [], criticalNodes = [], otherNodes = [], leaderTasks, criticalTasks, otherTasks;
   // 需要显示签名的任务列表：非起草环节的待办
   Task lastDraftTask = flowInst.tasks[0];        // 计算最后一次起草环节的任务：签名从这里开始，一旦退回，签名擦除
   for ( t in flowInst.tasks ) if (t!=lastDraftTask && t.type==Task.TYPE_TODO && t.node==lastDraftTask.node && t.status!='terminated') lastDraftTask = t;
   for ( t in flowInst.tasks ) if (t.type==Task.TYPE_TODO && t.createTime>lastDraftTask.createTime && t.status!='terminated') tasks << t;
   // 如果退回到环节A，则不显示原来在环节A的任务-被退回来的环节A的任务（不含）
   // 例如路径 A-B-C-A，其中C-A是退回，则不显示前面三个任务（A-B-C）的签名
   tasks = CollectionUtils.sort(tasks, 'asc', 'id');
   for ( int i=0; i<tasks.size(); i++ ) {
       if ( !tasks[i] ) continue;
        String node = tasks[i].node;
       for ( int j=i+1; j<tasks.size(); j++ ) {
           if ( tasks[j].node==node && tasks[j].sendType==Task.SEND_TYPE_BACK ) {
                List prevs = tasks[j].prevAllTasks();
               for ( int k=i; k<j; k++ ) if ( prevs.contains(tasks[k]) ) tasks[k] = null;
               break;
           }
       }
   }
   // 如果任务列表中存在相同任务环节名，并且他们的任务实际办理人相同，且存在已完成的任务，则擦除已完成任务的环节签名
   for ( int i=0; i<tasks.size(); i++ ) {
       if ( tasks[i] == null || tasks[i].completeTime ) continue;
       for ( int j=0; j<i; j++ ) {
           if ( tasks[j] && tasks[j].completeTime && tasks[j].node==tasks[i].node && tasks[j].actorId==tasks[i].actorId ) tasks[j] = null;
       }
   }
    tasks -= null;
   // 集团领导的审批任务，放到总裁、董事长审批行
   Closure uniqueClosure = {it.node + "@" + it.actorId};
    Closure sortSwapper = { List valList, Date completeTime, Task task->
       return completeTime ?: task.createTime;
   }
    leaderTasks = CollectionUtils.findAll(tasks, "actorTitle", ["总裁","董事长"]);    // 后面再查重，下面两段代码还用这个list变量
   // 关键任务列表，按时间顺序排列、根据审批人查重，放到审批行
   for ( n in proc.values() ) if (n instanceof Map && n.node && n.critical ) criticalNodes << n.node;
    criticalTasks = CollectionUtils.sort(
            CollectionUtils.sort(CollectionUtils.findAll(tasks, "node", criticalNodes)-leaderTasks,
           "desc", "completeTime").unique(uniqueClosure), "asc", "completeTime", sortSwapper);
   // 其他任务列表，按照级别（员工title）排序、根据审批人查重，放到审议行
   for ( n in proc.values() ) if (n instanceof Map && n.node && !n.critical ) otherNodes << n.node;
    otherTasks = CollectionUtils.sort(
            CollectionUtils.findAll(tasks, "node", otherNodes)-leaderTasks, "desc",
           "completeTime", sortSwapper).unique(uniqueClosure);
    otherTasks = otherTasks.sort{-app.AppUtils.getLevelByTitle(it.actorTitle)};
    leaderTasks = leaderTasks.unique(uniqueClosure);    // 集团领导的审批任务查重
   // 渲染签名表格
   StringBuilder sb = new StringBuilder();
    sb << '<table style="padding: 5px 0; border-collapse: collapse;">'
    renderSignature("审批", criticalTasks, sb);
    renderSignature("审议", otherTasks, sb);
    renderSignature("总裁、董事长审批", leaderTasks, sb);
    sb << '</table>';
    out << sb
}

private renderSignature(String caption, List tasks, StringBuilder sb) {
   if ( !tasks ) return;
    sb << '<tr class="prop"><td class="nameX" style="white-space:normal; text-align:center; vertical-align:middle; width:100px" rowspan="'
    sb << (Math.ceil(tasks.size()/8) * 2) << '">' << caption << '</td>'
    // 每行最多显示8条签名，签名图片大小为100*40
    int max = 8;
    for ( int i=0; i<tasks.size(); i+=max ) {
        if ( i!=0 ) sb << '<tr class="prop">';
        renderSignature( tasks.subList(i,[i+max,tasks.size()].min()), sb );
        sb << '</tr>'
    }
}

private renderSignature(List tasks, StringBuilder sb) {
    for ( t in tasks ) {
        sb << '<td class="nameX" style="white-space:normal; text-align:center; vertical-align:middle; width:100px; padding:4px">'
        if ( t.actorSubstituteId ) {
            // 仅当为已办、或代理人打开待办、或者非任一人处理时，才显示“代理”二字
            if ( t.completeTime || t.substituteType==Substitute.TYPE_MOVE || t.actorSubstituteId==session.employeeId ) {
                sb << '(代理)<br/>';
            }
        }
        //sb << DateUtils.formatDatetime(t.createTime) << "<br/>"
        sb << bropen.framework.core.osm.Organization.splitName(t.organizationFullName,1) << '/' << (t.actorTitle?:"员工") << '<br/>' << t.actor << '</td>'
    }
    sb << '</tr><tr class="prop" style="height:40px">'
    for ( t in tasks ) {
        // 计算员工签名：超时自动提交的显示“系统提交”，签名不存在则显示“已处理”
        String sigid = null;
        if ( t.prevStatus == "timeout" ) {
            sigid = "wf_timeout"
        } else if ( t.decisiveOpinion == "不同意" ) {
            sigid = "wf_disagree";
        } else if ( t.transition == "否决" ) {
            sigid = "wf_reject";
        } else if ( t.actorSubstituteId ) {
            sigid = t.actorSubstitute?.isSignatureExists() ? t.actorSubstitute.id : "wf_done";
        } else {
            sigid = t.actor?.isSignatureExists() ? t.actor.id : "wf_done";
        }
        // 渲染单元格
        sb << '<td class="valueX" style="text-align:center; vertical-align:middle; padding:0px; width:100px">'
        if ( t.status=="completed" ) {
            sb << '<img width="100" height="40" src="' << createLink(controller:'app', action:'signatureImage', id:sigid) << '"/>'
        } else {
            sb << "&nbsp;"
        }
        sb << '</td>'
   }
}

/**
 * 显示签名图片（不加水印），用于签名栏
 */
def signatureImage() {
    String filename = Employee.signatureFilename(params.id);
    File file = new File(filename);
   if ( file.exists() && file.canRead() ) {
       // 渲染图片，并设置1天的浏览器缓存
       osmEmployeeService.renderSignature( response, filename, false,
           [validFor:86400, shared:true, store:true, lastModified:file.lastModified()] );
   } else render "";
}

<div class="body">
   <foo:signature bean="${xxxInstance}" />
   <h1>${entityName}</h1>
    ....
</div>