feat(时间轴): 动作片段支持拖拽调整起止时间

src/editor/store/directorStore.ts

@@ -60,6 +60,9 @@ import {
   getTrajectoryPointTimes,
   getTrajectoryStartTime,
   shiftTrajectoryClip,
+  getMotionStartTime,
+  getMotionEndTime,
+  MOTION_CLIP_MIN_DURATION,
 } from "../schema/trajectoryMotion";
 
 export type TransformMode = "translate" | "rotate" | "scale";
@@ -170,6 +173,12 @@ export interface DirectorActions {
   setTrajectoryClipTrimStart: (objectId: string, startTime: number) => void;
   /** 设置人物轨迹片段的结束时间（停留时长）：角色走完最后一点后原地停留到这一刻，拖条右端把手时写入 */
   setTrajectoryClipEnd: (objectId: string, endTime: number) => void;
+  /** 整体平移动作片段（拖动作条本体）：片段起点与结束时间同步平移，保持动作时长不变 */
+  setMotionClipStart: (objectId: string, startTime: number) => void;
+  /** 修剪动作片段起点（拖动作条左端把手）：只挪动作开始时间，结束时间不动 */
+  setMotionClipTrimStart: (objectId: string, startTime: number) => void;
+  /** 设置动作片段的结束时间（拖动作条右端把手）：动作播放到这一刻停止，起点不动 */
+  setMotionClipEnd: (objectId: string, endTime: number) => void;
   removeTrajectoryPoint: (objectId: string, pointId: string) => void;
   /** 选中某个轨迹点；传 null 表示取消选中（点到轨道空白处 / 面板其它地方时清掉轨迹关键帧的选中态） */
   selectTrajectoryPoint: (objectId: string | null, pointId: string | null) => void;
@@ -1903,6 +1912,62 @@ export const useDirectorStore = create<DirectorStore>((set, get) => {
           }),
         },
       })),
+    setMotionClipStart: (objectId, startTime) =>
+      commitMutation((state) => ({
+        ...state,
+        project: {
+          ...state.project,
+          objects: updateObjectById(state.project.objects, objectId, (item) => {
+            const duration = state.project.timeline.duration;
+            const currentStart = getMotionStartTime(item, duration);
+            const currentEnd = getMotionEndTime(item, duration, currentStart);
+            // 片段刚性平移：动作时长（起点→终点）保持不变，起点夹在时间轴内，终点跟着走同样的量。
+            const minSpan = MOTION_CLIP_MIN_DURATION;
+            const span = Math.max(currentEnd - currentStart, minSpan);
+            const upper = Math.max(duration - span, 0);
+            const nextStart = Math.min(Math.max(startTime, 0), upper);
+            const delta = nextStart - currentStart;
+
+            return {
+              ...item,
+              motionStartTime: nextStart,
+              motionEndTime: currentEnd + delta,
+            };
+          }),
+        },
+      })),
+    setMotionClipTrimStart: (objectId, startTime) =>
+      commitMutation((state) => ({
+        ...state,
+        project: {
+          ...state.project,
+          objects: updateObjectById(state.project.objects, objectId, (item) => {
+            const duration = state.project.timeline.duration;
+            const currentEnd = getMotionEndTime(item, duration, getMotionStartTime(item, duration));
+            // 起点最多挪到「结束时间再往前一个最短时长」处，不能越过终点，否则片段就空了。
+            const upper = Math.max(currentEnd - MOTION_CLIP_MIN_DURATION, 0);
+            const nextStart = Math.min(Math.max(startTime, 0), upper);
+
+            return { ...item, motionStartTime: nextStart };
+          }),
+        },
+      })),
+    setMotionClipEnd: (objectId, endTime) =>
+      commitMutation((state) => ({
+        ...state,
+        project: {
+          ...state.project,
+          objects: updateObjectById(state.project.objects, objectId, (item) => {
+            const duration = state.project.timeline.duration;
+            const currentStart = getMotionStartTime(item, duration);
+            // 结束时间夹在「起点 + 最短时长 ~ 时间轴末尾」之间，保证片段始终合法、不为空。
+            const lower = currentStart + MOTION_CLIP_MIN_DURATION;
+            const nextEnd = Math.min(Math.max(endTime, lower), duration);
+
+            return { ...item, motionEndTime: nextEnd };
+          }),
+        },
+      })),
     removeTrajectoryPoint: (objectId, pointId) =>
       commitMutation((state) => ({
         ...state,