| /* |
| * Copyright 2019 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.text.style |
| |
| import androidx.compose.Immutable |
| import androidx.ui.unit.TextUnit |
| import androidx.ui.unit.sp |
| import androidx.ui.text.lerpTextUnitInheritable |
| |
| /** |
| * Specify the indentation of a paragraph. |
| * |
| * @param firstLine the amount of indentation applied to the first line. |
| * @param restLine the amount of indentation applied to every line except the first line. |
| */ |
| @Immutable |
| data class TextIndent( |
| val firstLine: TextUnit = 0.sp, |
| val restLine: TextUnit = 0.sp |
| ) { |
| companion object { |
| /** |
| * Constant fot no text indent. |
| */ |
| val None = TextIndent() |
| } |
| } |
| |
| /** |
| * Linearly interpolate between two [TextIndent]s. |
| * |
| * The [fraction] argument represents position on the timeline, with 0.0 meaning |
| * that the interpolation has not started, returning [start] (or something |
| * equivalent to [start]), 1.0 meaning that the interpolation has finished, |
| * returning [stop] (or something equivalent to [stop]), and values in between |
| * meaning that the interpolation is at the relevant point on the timeline |
| * between [start] and [stop]. The interpolation can be extrapolated beyond 0.0 and |
| * 1.0, so negative values and values greater than 1.0 are valid. |
| */ |
| fun lerp(start: TextIndent, stop: TextIndent, fraction: Float): TextIndent { |
| return TextIndent( |
| lerpTextUnitInheritable(start.firstLine, stop.firstLine, fraction), |
| lerpTextUnitInheritable(start.restLine, stop.restLine, fraction) |
| ) |
| } |