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Camera组件因改严格模式，页面statechange会导致画面闪烁，添加设备ID缓存，只有真正修改设备才执行重置操作 #8261

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kkxkx wants to merge 5 commits into from
+27 −34
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Camera组件因改严格模式，页面statechange会导致画面闪烁，添加设备ID缓存，只有真正修改设备才执行重置操作 #8261

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2d52179
Update deviceId structure in camera configuration
kkxkx Jul 23, 2026
4270322
chore: bump version 10.8.2-beta03
ArgoZhang Jul 23, 2026
becc286
Merge branch 'dotnetcore:main' into main
kkxkx Jul 23, 2026
1e37e4e
Merge branch 'dotnetcore:main' into main
kkxkx Jul 24, 2026
d872ef7
Refactor camera functions for async handling
kkxkx Jul 24, 2026
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61 changes: 27 additions & 34 deletions src/BootstrapBlazor/Components/Camera/Camera.razor.js
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
import Data from "../../modules/data.js"
import Data from "../../modules/data.js"

const openDevice = camera => {
if (camera.video) {
Expand Down Expand Up @@ -29,68 +29,61 @@ const stopDevice = camera => {
}
}

const play = (camera, option = {}) => {
const play = async (camera, option = {}) => {
const constrains = {
...{
video: {
facingMode: "environment"
},
audio: false
},
video: { facingMode: "environment" },
audio: false,
...option
}
navigator.mediaDevices.getUserMedia(constrains).then(stream => {
try {
const stream = await navigator.mediaDevices.getUserMedia(constrains);
camera.video = { deviceId: option.video.deviceId };
camera.video.element = camera.el.querySelector('video')
camera.video.element.srcObject = stream
camera.video.element.play()
await camera.video.element.play()
camera.video.track = stream.getVideoTracks()[0]
// 写入当前正常运行的设备ID
camera.lastUsedDeviceId = option.video.deviceId.exact ?? option.video.deviceId;
camera.invoke.invokeMethodAsync("TriggerOpen")
}).catch(err => {
} catch (err) {
delete camera.video
camera.invoke.invokeMethodAsync("TriggerError", err.name)
})
}
}

export function init(id, invoke) {
const el = document.getElementById(id)
if (el === null) {
return
}
const camera = { el, invoke }
if (el === null) return
// 新增lastUsedDeviceId记录当前正在运行的设备ID
const camera = { el, invoke, lastUsedDeviceId: null }
Data.set(id, camera)

navigator.mediaDevices.getUserMedia({ video: true, audio: false }).then(s => {
navigator.mediaDevices.enumerateDevices().then(videoInputDevices => {
const videoInputs = videoInputDevices.filter(device => {
return device.kind === 'videoinput'
})
const videoInputs = videoInputDevices.filter(device => device.kind === 'videoinput')
invoke.invokeMethodAsync("TriggerInit", videoInputs)
})
}).catch(err => {
invoke.invokeMethodAsync("TriggerError", err.message)
})
}

export function update(id) {
export async function update(id) {
const camera = Data.get(id)
if (camera === null) {
return
}
if (camera === null) return

// handler switch device
const domDeviceId = camera.el.getAttribute("data-device-id")
// ID没有发生变化，直接return，不会执行关闭、重开硬件流程，彻底消除闪烁
if (camera.lastUsedDeviceId === domDeviceId) return;

// 只有切换设备时才执行硬件重启
if (camera.video) {
const deviceId = camera.el.getAttribute("data-device-id")
if (camera.video.deviceId !== deviceId) {
stopDevice(camera)
openDevice(camera)
}
}
else {
stopDevice(camera)
await new Promise(r => setTimeout(r, 350));

@sourcery-ai sourcery-ai Bot Jul 24, 2026

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suggestion: Consider extracting the 350ms delay into a named constant or configuration.

This hard-coded timeout is a magic number and likely tied to hardware or UX behavior. Defining it as a shared constant (e.g., DEVICE_SWITCH_DELAY_MS) makes its intent clear and ensures any future adjustments stay consistent across the codebase.

Suggested implementation:

        stopDevice(camera)
        await new Promise(r => setTimeout(r, DEVICE_SWITCH_DELAY_MS));
        await openDevice(camera)

To fully implement this change, also:

  1. Define a named constant near the top of Camera.razor.js, for example:
    const DEVICE_SWITCH_DELAY_MS = 350;
  2. If there is an existing configuration or constants section in this file or a related module, prefer adding DEVICE_SWITCH_DELAY_MS there to keep all such values centralized.

await openDevice(camera)
} else {
const autoStart = camera.el.getAttribute("data-auto-start") || false
if (autoStart) {
openDevice(camera)
}
if (autoStart) await openDevice(camera)
}
}

Expand Down
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