释放按钮后颤振启用事件

Question

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说明

1. 只有一个按钮
2. 按钮在 State A 中，按下时
3. 在屏幕上拖动指针时，按钮不会触发任何其他事件。
4. 按钮在 State B 中，当指针从屏幕上消失时，即拖过屏幕或指针与屏幕不完整。

我尝试了什么

• 使用 GestureDetector 和为方法 onTapDown 和 onTapUp 创建的函数
• 这就是我得到的

══╡ EXCEPTION CAUGHT BY GESTURE ╞═══════════════════════════════════════════════════════════════════
The following RangeError was thrown while handling a gesture:
Value not in range: 0

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 236:49  throw_
dart-sdk/lib/_internal/js_dev_runtime/private/js_string.dart 171:66           substring]
packages/safer/controllers/number_pad_controller.dart 37:31                   deleteInput
packages/flutter/src/material/ink_well.dart 991:14                            [_handleTap]
packages/flutter/src/gestures/recognizer.dart 182:24                          invokeCallback
packages/flutter/src/gestures/tap.dart 607:48                                 handleTapUp
packages/flutter/src/gestures/tap.dart 296:5                                  [_checkUp]
packages/flutter/src/gestures/tap.dart 267:7                                  acceptGesture
packages/flutter/src/gestures/arena.dart 157:12                               sweep
packages/flutter/src/gestures/binding.dart 385:20                             handleEvent
packages/flutter/src/gestures/binding.dart 361:14                             dispatchEvent
packages/flutter/src/rendering/binding.dart 278:11                            dispatchEvent
packages/flutter/src/gestures/binding.dart 316:7                              [_handlePointerEventImmediately]
packages/flutter/src/gestures/binding.dart 280:5                              handlePointerEvent
packages/flutter/src/gestures/binding.dart 238:7                              [_flushPointerEventQueue]
packages/flutter/src/gestures/binding.dart 221:32                             [_handlePointerDataPacket]
lib/_engine/engine/platform_dispatcher.dart 911:13                            invoke1
lib/_engine/engine/platform_dispatcher.dart 170:5                             invokeOnPointerDataPacket
lib/_engine/engine/pointer_binding.dart 128:39                                [_onPointerData]
lib/_engine/engine/pointer_binding.dart 553:18                                <fn>
lib/_engine/engine/pointer_binding.dart 506:21                                <fn>
lib/_engine/engine/pointer_binding.dart 214:16                                <fn>

Handler: "onTap"
Recognizer:
  TapGestureRecognizer#87a24
════════════════════════════════════════════════════════════════════════════════════════════════════
Another exception was thrown: RangeError: Value not in range: 0

• 然而，它从 State A 移动到 State B
• 但是当我将指针与按钮完好无损地移出按钮，然后将指针从屏幕上移开时，按钮不会更改为 State B 并保持在 State A

问题

• 我想就解决此问题所需采取的措施提出建议
• 或任何我认为有助于解决此问题的补充资源

Answer 1

事实证明我可以解决这个问题。

1. 将 onLongPress 方法设置为 State A
2. 将 onLongPressEnd 方法设置为 State B