opt: query dm

Closes #544

Signed-off-by: bggRGjQaUbCoE <githubaccount56556@proton.me>

lib/pages/danmaku/controller.dart

@@ -12,23 +12,10 @@ class PlDanmakuController {
 
   Map<int, List<DanmakuElem>> dmSegMap = {};
   // 已请求的段落标记
-  List<bool> requestedSeg = [];
-
-  bool get initiated => requestedSeg.isNotEmpty;
+  Map requestedSeg = {};
 
   static int segmentLength = 60 * 6 * 1000;
 
-  void initiate(int videoDuration, int progress) {
-    if (videoDuration <= 0) {
-      return;
-    }
-    if (requestedSeg.isEmpty) {
-      int segCount = (videoDuration / segmentLength).ceil();
-      requestedSeg = List<bool>.generate(segCount, (index) => false);
-    }
-    queryDanmaku(calcSegment(progress));
-  }
-
   void dispose() {
     dmSegMap.clear();
     requestedSeg.clear();
@@ -39,34 +26,35 @@ class PlDanmakuController {
   }
 
   void queryDanmaku(int segmentIndex) async {
-    if (requestedSeg.length <= segmentIndex) {
+    if (requestedSeg[segmentIndex] == true) {
       return;
     }
-    assert(requestedSeg[segmentIndex] == false);
     requestedSeg[segmentIndex] = true;
-    final DmSegMobileReply result = await DanmakuHttp.queryDanmaku(
+    final Map result = await DanmakuHttp.queryDanmaku(
       cid: cid,
       segmentIndex: segmentIndex + 1,
       mergeDanmaku: plPlayerController.mergeDanmaku,
     );
-    if (result.elems.isNotEmpty) {
-      for (var element in result.elems) {
-        int pos = element.progress ~/ 100; //每0.1秒存储一次
-        if (dmSegMap[pos] == null) {
-          dmSegMap[pos] = [];
+    if (result['status']) {
+      if (result['data'].elems.isNotEmpty) {
+        for (var element in result['data'].elems) {
+          int pos = element.progress ~/ 100; //每0.1秒存储一次
+          if (dmSegMap[pos] == null) {
+            dmSegMap[pos] = [];
+          }
+          dmSegMap[pos]!.add(element);
         }
-        dmSegMap[pos]!.add(element);
       }
+    } else {
+      requestedSeg[segmentIndex] = false;
     }
   }
 
   List<DanmakuElem>? getCurrentDanmaku(int progress) {
     int segmentIndex = calcSegment(progress);
-    if (requestedSeg.length <= segmentIndex) {
-      return <DanmakuElem>[];
-    }
-    if (!requestedSeg[segmentIndex]) {
+    if (requestedSeg[segmentIndex] != true) {
       queryDanmaku(segmentIndex);
+      return null;
     }
     if (plPlayerController.danmakuWeight == 0 &&
         plPlayerController.filters.count == 0) {