ScaleZoomHelper.kt
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/*
* Copyright 2024 LiveKit, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.livekit.android.camerax.ui
import android.content.Context
import android.view.ScaleGestureDetector
import android.view.ScaleGestureDetector.SimpleOnScaleGestureListener
import androidx.camera.core.Camera
import io.livekit.android.room.track.LocalVideoTrack
import io.livekit.android.util.LKLog
import kotlinx.coroutines.flow.StateFlow
import livekit.org.webrtc.getCameraX
class ScaleZoomHelper(
private val cameraFlow: StateFlow<Camera?>?,
) {
constructor(localVideoTrack: LocalVideoTrack) : this(localVideoTrack.capturer.getCameraX())
init {
if (cameraFlow != null) {
LKLog.w { "null camera flow passed in to ScaleZoomHelper, zoom is disabled." }
}
}
fun zoom(factor: Float) {
val camera = cameraFlow?.value ?: return
val zoomState = camera.cameraInfo.zoomState.value ?: return
val currentZoom = zoomState.zoomRatio
val newZoom = (currentZoom * factor).coerceIn(zoomState.minZoomRatio, zoomState.maxZoomRatio)
if (newZoom != currentZoom) {
camera.cameraControl.setZoomRatio(newZoom)
}
}
companion object {
fun createGestureDetector(context: Context, localVideoTrack: LocalVideoTrack): ScaleGestureDetector {
return createGestureDetector(context, localVideoTrack.capturer.getCameraX())
}
fun createGestureDetector(context: Context, cameraFlow: StateFlow<Camera?>?): ScaleGestureDetector {
val helper = ScaleZoomHelper(cameraFlow)
return ScaleGestureDetector(
context,
object : SimpleOnScaleGestureListener() {
override fun onScale(detector: ScaleGestureDetector): Boolean {
helper.zoom(detector.scaleFactor)
return true
}
},
).apply {
isQuickScaleEnabled = false
}
}
}
}