| /* |
| * 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.ui.layout |
| |
| import androidx.ui.core.Constraints |
| import androidx.ui.core.IntrinsicMeasurable |
| import androidx.ui.core.IntrinsicMeasureScope |
| import androidx.ui.core.LayoutDirection |
| import androidx.ui.core.LayoutModifier |
| import androidx.ui.core.Measurable |
| import androidx.ui.core.MeasureScope |
| import androidx.ui.core.Modifier |
| /** |
| * [Modifier] that changes the [LayoutDirection] of the wrapped layout to [LayoutDirection.Ltr]. |
| */ |
| val Modifier.ltr: Modifier get() = this + LtrModifier |
| |
| /** |
| * [Modifier] that changes the [LayoutDirection] of the wrapped layout to [LayoutDirection.Rtl]. |
| */ |
| val Modifier.rtl: Modifier get() = this + RtlModifier |
| |
| private val LtrModifier = LayoutDirectionModifier(LayoutDirection.Ltr) |
| |
| private val RtlModifier = LayoutDirectionModifier(LayoutDirection.Rtl) |
| |
| private data class LayoutDirectionModifier( |
| val prescribedLayoutDirection: LayoutDirection |
| ) : LayoutModifier { |
| override fun MeasureScope.measure( |
| measurable: Measurable, |
| constraints: Constraints, |
| layoutDirection: LayoutDirection |
| ): MeasureScope.MeasureResult { |
| val placeable = measurable.measure(constraints, prescribedLayoutDirection) |
| return layout(placeable.width, placeable.height) { |
| placeable.place(0, 0) |
| } |
| } |
| |
| override fun IntrinsicMeasureScope.minIntrinsicWidth( |
| measurable: IntrinsicMeasurable, |
| height: Int, |
| layoutDirection: LayoutDirection |
| ) = measurable.minIntrinsicWidth(height, prescribedLayoutDirection) |
| |
| override fun IntrinsicMeasureScope.minIntrinsicHeight( |
| measurable: IntrinsicMeasurable, |
| width: Int, |
| layoutDirection: LayoutDirection |
| ) = measurable.minIntrinsicHeight(width, prescribedLayoutDirection) |
| |
| override fun IntrinsicMeasureScope.maxIntrinsicWidth( |
| measurable: IntrinsicMeasurable, |
| height: Int, |
| layoutDirection: LayoutDirection |
| ) = measurable.maxIntrinsicWidth(height, prescribedLayoutDirection) |
| |
| override fun IntrinsicMeasureScope.maxIntrinsicHeight( |
| measurable: IntrinsicMeasurable, |
| width: Int, |
| layoutDirection: LayoutDirection |
| ) = measurable.maxIntrinsicHeight(width, prescribedLayoutDirection) |
| } |