kopia lustrzana https://github.com/vitorpamplona/amethyst
76 wiersze
3.0 KiB
Kotlin
76 wiersze
3.0 KiB
Kotlin
/*
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* Copyright 2022 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package androidx.compose.material3.pullrefresh
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import androidx.compose.animation.core.LinearOutSlowInEasing
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import androidx.compose.ui.Modifier
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import androidx.compose.ui.draw.drawWithContent
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import androidx.compose.ui.graphics.drawscope.clipRect
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import androidx.compose.ui.graphics.graphicsLayer
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import androidx.compose.ui.platform.debugInspectorInfo
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import androidx.compose.ui.platform.inspectable
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/**
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* A modifier for translating the position and scaling the size of a pull-to-refresh indicator
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* based on the given [PullRefreshState].
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*
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* @sample androidx.compose.material.samples.PullRefreshIndicatorTransformSample
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*
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* @param state The [PullRefreshState] which determines the position of the indicator.
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* @param scale A boolean controlling whether the indicator's size scales with pull progress or not.
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*/
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// TODO: Consider whether the state parameter should be replaced with lambdas.
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fun Modifier.pullRefreshIndicatorTransform(
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state: PullRefreshState,
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scale: Boolean = false
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) = inspectable(
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inspectorInfo = debugInspectorInfo {
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name = "pullRefreshIndicatorTransform"
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properties["state"] = state
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properties["scale"] = scale
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}
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) {
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Modifier
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// Essentially we only want to clip the at the top, so the indicator will not appear when
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// the position is 0. It is preferable to clip the indicator as opposed to the layout that
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// contains the indicator, as this would also end up clipping shadows drawn by items in a
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// list for example - so we leave the clipping to the scrolling container. We use MAX_VALUE
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// for the other dimensions to allow for more room for elevation / arbitrary indicators - we
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// only ever really want to clip at the top edge.
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.drawWithContent {
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clipRect(
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top = 0f,
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left = -Float.MAX_VALUE,
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right = Float.MAX_VALUE,
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bottom = Float.MAX_VALUE
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) {
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this@drawWithContent.drawContent()
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}
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}
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.graphicsLayer {
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translationY = state.position - size.height
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if (scale && !state.refreshing) {
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val scaleFraction = LinearOutSlowInEasing
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.transform(state.position / state.threshold)
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.coerceIn(0f, 1f)
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scaleX = scaleFraction
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scaleY = scaleFraction
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}
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}
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}
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