| /* |
| * Copyright 2020 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.compose.foundation.layout |
| |
| import androidx.compose.Stable |
| import androidx.compose.State |
| import androidx.compose.mutableStateOf |
| import androidx.compose.ui.unit.Constraints |
| import androidx.compose.ui.unit.LayoutDirection |
| import androidx.ui.core.LayoutModifier |
| import androidx.ui.core.Measurable |
| import androidx.ui.core.MeasureScope |
| import androidx.ui.core.Modifier |
| import androidx.compose.ui.unit.Dp |
| import androidx.compose.ui.unit.dp |
| import kotlin.math.roundToInt |
| |
| /** |
| * Offset the content by ([x] dp, [y] dp). The offsets can be positive as well as non positive. |
| * |
| * Example usage: |
| * @sample androidx.compose.foundation.layout.samples.LayoutOffsetModifier |
| */ |
| @Stable |
| fun Modifier.offset(x: Dp = 0.dp, y: Dp = 0.dp) = this.then(OffsetModifier(x, y)) |
| |
| /** |
| * Offset the content by ([x] px, [y]px). The offsets can be positive as well as non positive. |
| * This modifier is designed to be used for offsets that change, possibly due to user interactions. |
| * |
| * Example usage: |
| * @sample androidx.compose.foundation.layout.samples.LayoutOffsetPxModifier |
| */ |
| fun Modifier.offsetPx( |
| x: State<Float> = mutableStateOf(0f), |
| y: State<Float> = mutableStateOf(0f) |
| ) = this.then(OffsetPxModifier(x, y)) |
| |
| private data class OffsetModifier(val x: Dp, val y: Dp) : LayoutModifier { |
| override fun MeasureScope.measure( |
| measurable: Measurable, |
| constraints: Constraints, |
| layoutDirection: LayoutDirection |
| ): MeasureScope.MeasureResult { |
| val placeable = measurable.measure(constraints) |
| return layout(placeable.width, placeable.height) { |
| placeable.place(x.toIntPx(), y.toIntPx()) |
| } |
| } |
| } |
| |
| private data class OffsetPxModifier(val x: State<Float>, val y: State<Float>) : LayoutModifier { |
| override fun MeasureScope.measure( |
| measurable: Measurable, |
| constraints: Constraints, |
| layoutDirection: LayoutDirection |
| ): MeasureScope.MeasureResult { |
| val placeable = measurable.measure(constraints) |
| return layout(placeable.width, placeable.height) { |
| placeable.place(x.value.roundToInt(), y.value.roundToInt()) |
| } |
| } |
| } |