/
PauseLoadWhenScrollingDrawableDecodeInterceptor.kt
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/
PauseLoadWhenScrollingDrawableDecodeInterceptor.kt
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/*
* Copyright (C) 2022 panpf <panpfpanpf@outlook.com>
*
* 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 com.github.panpf.sketch.request
import com.github.panpf.sketch.decode.DrawableDecodeInterceptor
import com.github.panpf.sketch.decode.DrawableDecodeInterceptor.Chain
import com.github.panpf.sketch.decode.DrawableDecodeResult
import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.flow.filter
import kotlinx.coroutines.flow.first
/**
* Pause loading new images while the list is scrolling
*
* @see DisplayRequest.Builder.pauseLoadWhenScrolling
*/
class PauseLoadWhenScrollingDrawableDecodeInterceptor(override val sortWeight: Int = 0) :
DrawableDecodeInterceptor {
companion object {
private val scrollingFlow = MutableStateFlow(false)
var scrolling: Boolean
get() = scrollingFlow.value
set(value) {
scrollingFlow.value = value
}
}
var enabled = true
override val key: String? = null
override suspend fun intercept(chain: Chain): Result<DrawableDecodeResult> {
val request = chain.request
if (enabled
&& request is DisplayRequest
&& request.isPauseLoadWhenScrolling
&& !request.isIgnoredPauseLoadWhenScrolling
&& scrollingFlow.value
) {
scrollingFlow.filter { !it }.first()
}
return chain.proceed()
}
override fun equals(other: Any?): Boolean {
if (this === other) return true
if (javaClass != other?.javaClass) return false
other as PauseLoadWhenScrollingDrawableDecodeInterceptor
if (sortWeight != other.sortWeight) return false
return true
}
override fun hashCode(): Int {
return sortWeight
}
override fun toString(): String =
"PauseLoadWhenScrollingDrawableDecodeInterceptor(sortWeight=$sortWeight,enabled=$enabled)"
}