下载/主界面优化

src-tauri/src/download_engine/engine.rs

@@ -158,9 +158,10 @@ impl DownloadEngine {
 
         let id = self.inner.storage.next_task_id();
 
-        // 创建分段
+        // 创建分段（受 continue_download 设置控制：关闭时强制单线程、不支持续传）
+        let resume_enabled = settings.continue_download;
         let segments = match &probe {
-            Ok(p) if p.supports_resume && p.total_size.map(|s| s > 0).unwrap_or(false) => {
+            Ok(p) if resume_enabled && p.supports_resume && p.total_size.map(|s| s > 0).unwrap_or(false) => {
                 split_segments(p.total_size.unwrap(), settings.max_connections)
             }
             _ => vec![Segment {
@@ -172,7 +173,8 @@ impl DownloadEngine {
         };
 
         let total_size = probe.as_ref().ok().and_then(|p| p.total_size).unwrap_or(0);
-        let supports_resume = probe.as_ref().ok().map(|p| p.supports_resume).unwrap_or(false);
+        let supports_resume = resume_enabled
+            && probe.as_ref().ok().map(|p| p.supports_resume).unwrap_or(false);
 
         let task = DownloadTask {
             id: id.clone(),