PreloadTracker class
进度追踪器 — 监听任务状态变更，计算并推送进度更新
支持多次 execute() 调用（每次 start() 重置状态）， 并对快速连续的进度更新进行去抖动，避免 UI 抖动。
Constructors
- PreloadTracker({Duration debounceThreshold = const Duration(milliseconds: 50)})
Properties
-
contexts
→ List<
TaskExecutionContext> -
获取所有任务上下文
no setter
- debounceThreshold → Duration
-
进度更新去抖动间隔
final
- hashCode → int
-
The hash code for this object.
no setterinherited
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
- state → PreloadManagerState
-
当前管理器状态（暴露给 PreloadManager）
no setter
-
stream
→ Stream<
PreloadProgress> -
进度流
no setter
Methods
-
cancelAll(
) → void - 批量取消所有任务
-
complete(
PreloadManagerState finalState) → void - 完成追踪
-
dispose(
) → void - 释放资源
-
getContext(
String taskId) → TaskExecutionContext? - 获取任务上下文
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent method or property is accessed.
inherited
-
onTaskCancelled(
String taskId) → void - 任务被取消
-
onTaskComplete(
String taskId, dynamic result) → void - 任务执行完成
-
onTaskFail(
String taskId, Object error) → void - 任务执行失败
-
onTaskStart(
String taskId) → void - 任务开始执行
-
reset(
) → void - 重置追踪器（允许多次执行）
-
start(
List< PreloadTask> tasks, [DateTime? startTime]) → void - 启动追踪
-
toString(
) → String -
A string representation of this object.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited