| /* |
| * 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.compose.ui.text |
| |
| import androidx.ui.core.Constraints |
| import androidx.ui.core.LayoutDirection |
| import androidx.compose.ui.text.font.Font |
| import androidx.compose.ui.text.style.TextOverflow |
| import androidx.ui.unit.Density |
| |
| /** |
| * Returns true if the this TextLayoutResult can be reused for given parameters. |
| * |
| * @param text a text to be used for computing text layout. |
| * @param style a text style to be used for computing text layout. |
| * @param maxLines a maximum number of lines to be used for computing text layout. |
| * @param softWrap whether doing softwrap or not to be used for computing text layout. |
| * @param overflow an overflow type to be used for computing text layout. |
| * @param density a density to be used for computing text layout. |
| * @param layoutDirection a layout direction to be used for computing text layout. |
| * @param resourceLoader a resource loader to be used for computing text layout. |
| * @param constraints a constraint to be used for computing text layout. |
| */ |
| internal fun TextLayoutResult.canReuse( |
| text: AnnotatedString, |
| style: TextStyle, |
| maxLines: Int, |
| softWrap: Boolean, |
| overflow: TextOverflow, |
| density: Density, |
| layoutDirection: LayoutDirection, |
| resourceLoader: Font.ResourceLoader, |
| constraints: Constraints |
| ): Boolean { |
| |
| // Check if this is created from the same parameter. |
| val layoutInput = this.layoutInput |
| if (!(layoutInput.text == text && |
| layoutInput.style == style && |
| layoutInput.maxLines == maxLines && |
| layoutInput.softWrap == softWrap && |
| layoutInput.overflow == overflow && |
| layoutInput.density == density && |
| layoutInput.layoutDirection == layoutDirection && |
| layoutInput.resourceLoader == resourceLoader)) { |
| return false |
| } |
| |
| // Check the given constraints can produces the same result. |
| if (constraints.minWidth != layoutInput.constraints.minWidth) return false |
| |
| if (!(softWrap || overflow == TextOverflow.Ellipsis)) { |
| // If width does not mattter, we can result the same layout. |
| return true |
| } |
| return constraints.maxWidth == layoutInput.constraints.maxWidth |
| } |