| /* |
| * 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.ui.lerp |
| |
| /** |
| * The amount by which the text is shifted up or down from current the baseline. |
| * @constructor |
| * @sample androidx.ui.text.samples.BaselineShiftSample |
| * @sample androidx.ui.text.samples.BaselineShiftAnnotatedStringSample |
| * |
| * @param multiplier shift the baseline by multiplier * (baseline - ascent) |
| */ |
| /*inline*/ data class BaselineShift constructor( |
| val multiplier: Float |
| ) { |
| companion object { |
| /** |
| * Default baseline shift for superscript. |
| */ |
| val Superscript = BaselineShift(0.5f) |
| |
| /** |
| * Default baseline shift for subscript |
| */ |
| val Subscript = BaselineShift(-0.5f) |
| } |
| } |
| |
| /** |
| * Linearly interpolate two [BaselineShift]s. |
| */ |
| fun lerp(start: BaselineShift?, stop: BaselineShift?, fraction: Float): BaselineShift? { |
| if (start == null && stop == null) { |
| return null |
| } |
| if (start == null) { |
| return BaselineShift(stop!!.multiplier * fraction) |
| } |
| if (stop == null) { |
| return BaselineShift(start.multiplier * (1f - fraction)) |
| } |
| return BaselineShift(lerp(start.multiplier, stop.multiplier, fraction)) |
| } |
