diff --git a/tools/chatgui/src/messagedelegate.cpp b/tools/chatgui/src/messagedelegate.cpp
index ceeb9790..e116b6ab 100644
--- a/tools/chatgui/src/messagedelegate.cpp
+++ b/tools/chatgui/src/messagedelegate.cpp
@@ -24,14 +24,6 @@
 #include <QDebug>
 #include <QImageReader>
 
-extern "C" {
-#include "../transport/gui_bridge.h"
-#include "chat/chat_core.h"
-#include "../../lib/u_async.h"
-#include "../../lib/mem.h"
-void chat_core_attachment_download_trampoline(void* arg);
-}
-
 MessageDelegate::MessageDelegate(QObject *parent)
     : QStyledItemDelegate(parent) {}
 
@@ -96,16 +88,7 @@ bool MessageDelegate::editorEvent(QEvent *event, QAbstractItemModel *model,
         }
         if (dlState == 1) return false; /* скачивается */
 
-        if (chId.isEmpty() || msgId <= 0) return false;
-        struct attachment_dl_req* req = (struct attachment_dl_req*)
-            u_malloc(sizeof(struct attachment_dl_req));
-        if (!req) return false;
-        memset(req, 0, sizeof(*req));
-        req->inst = gui_bridge_get_inst();
-        strncpy(req->channel_id, chId.toUtf8().constData(), sizeof(req->channel_id) - 1);
-        req->msg_id = msgId;
-        gui_bridge_post_uasync_fn(chat_core_attachment_download_trampoline, req);
-        return true;
+        return m_downloadCb && m_downloadCb(index);
     }
 
     if (L.isImage) {
@@ -123,16 +106,7 @@ bool MessageDelegate::editorEvent(QEvent *event, QAbstractItemModel *model,
         }
         if (dlState == 1) return false; /* скачивается */
 
-        if (chId.isEmpty() || msgId <= 0) return false;
-        struct attachment_dl_req* req = (struct attachment_dl_req*)
-            u_malloc(sizeof(struct attachment_dl_req));
-        if (!req) return false;
-        memset(req, 0, sizeof(*req));
-        req->inst = gui_bridge_get_inst();
-        strncpy(req->channel_id, chId.toUtf8().constData(), sizeof(req->channel_id) - 1);
-        req->msg_id = msgId;
-        gui_bridge_post_uasync_fn(chat_core_attachment_download_trampoline, req);
-        return true;
+        return m_downloadCb && m_downloadCb(index);
     }
 
     if (L.isFile) {
@@ -151,16 +125,7 @@ bool MessageDelegate::editorEvent(QEvent *event, QAbstractItemModel *model,
         }
         if (dlState == 1) return false; /* downloading — no action */
 
-        if (chId.isEmpty() || msgId <= 0) return false;
-        struct attachment_dl_req* req = (struct attachment_dl_req*)
-            u_malloc(sizeof(struct attachment_dl_req));
-        if (!req) return false;
-        memset(req, 0, sizeof(*req));
-        req->inst = gui_bridge_get_inst();
-        strncpy(req->channel_id, chId.toUtf8().constData(), sizeof(req->channel_id) - 1);
-        req->msg_id = msgId;
-        gui_bridge_post_uasync_fn(chat_core_attachment_download_trampoline, req);
-        return true;
+        return m_downloadCb && m_downloadCb(index);
     }
 
     if (!L.isVoice) return false;
@@ -184,15 +149,7 @@ bool MessageDelegate::editorEvent(QEvent *event, QAbstractItemModel *model,
     /* not downloaded (or file evicted): start download (play will start on completion) */
     bool fileMissing = filePath.isEmpty() || !QFile::exists(filePath);
     if (fileMissing && dlState != 1) {
-        if (chId.isEmpty() || msgId <= 0) return false;
-        struct attachment_dl_req* req = (struct attachment_dl_req*)
-            u_malloc(sizeof(struct attachment_dl_req));
-        if (!req) return false;
-        memset(req, 0, sizeof(*req));
-        req->inst = gui_bridge_get_inst();
-        strncpy(req->channel_id, chId.toUtf8().constData(), sizeof(req->channel_id) - 1);
-        req->msg_id = msgId;
-        gui_bridge_post_uasync_fn(chat_core_attachment_download_trampoline, req);
+        if (!m_downloadCb || !m_downloadCb(index)) return false;
         model->setData(index, true, MsgVoiceDownloadPendingRole);
         return true;
     }
diff --git a/tools/chatgui/src/messagedelegate.h b/tools/chatgui/src/messagedelegate.h
index 11af1818..a8181e16 100644
--- a/tools/chatgui/src/messagedelegate.h
+++ b/tools/chatgui/src/messagedelegate.h
@@ -60,6 +60,7 @@ public:
 
     void setVideoOpenCallback(std::function<void(const QString&)> cb) { m_videoOpenCb = std::move(cb); }
     void setImageOpenCallback(std::function<void(const QString&)> cb) { m_imageOpenCb = std::move(cb); }
+    void setDownloadCallback(std::function<bool(const QModelIndex&)> cb) { m_downloadCb = std::move(cb); }
 
 private:
     struct Layout {
@@ -102,6 +103,7 @@ private:
 
     std::function<void(const QString&)> m_videoOpenCb;
     std::function<void(const QString&)> m_imageOpenCb;
+    std::function<bool(const QModelIndex&)> m_downloadCb;
 
     Layout calcLayout(const QStyleOptionViewItem &option,
                       const QModelIndex &index) const;