| /* |
| * Copyright 2018 The Android Open Source Project |
| * |
| * 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 androidx.ui.rendering.viewport_offset |
| |
| import androidx.ui.animation.Curve |
| import androidx.ui.core.Duration |
| import kotlinx.coroutines.CompletableDeferred |
| import kotlinx.coroutines.Deferred |
| |
| /** |
| * A ViewportOffset implementation for the fixed pixel. |
| */ |
| internal class FixedViewportOffset(pixels: Float) : ViewportOffset() { |
| companion object { |
| fun zero(): FixedViewportOffset { |
| return FixedViewportOffset(0.0f) |
| } |
| } |
| |
| override var pixels: Float = pixels |
| get() = field |
| private set(pixels: Float) { |
| field = pixels |
| } |
| |
| override fun applyContentDimensions(minScrollExtent: Float, maxScrollExtent: Float): Boolean = |
| true |
| |
| override fun applyViewportDimension(viewportDimension: Float): Boolean = true |
| |
| override fun correctBy(correction: Float) { |
| pixels += correction |
| } |
| |
| override fun jumpTo(pixels: Float) { |
| // Do nothing, viewport is fixed. |
| } |
| |
| override fun animateTo(to: Float, duration: Duration?, curve: Curve?): Deferred<Unit> { |
| return CompletableDeferred(Unit) |
| } |
| |
| override val userScrollDirection: ScrollDirection = ScrollDirection.IDLE |
| |
| override val allowImplicitScrolling: Boolean = false |
| } |