| /* |
| * 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 |
| |
| import androidx.compose.runtime.Composable |
| import androidx.compose.ui.Modifier |
| import androidx.compose.ui.graphics.drawscope.DrawScope |
| import androidx.compose.foundation.layout.ColumnScope |
| import androidx.compose.foundation.layout.Spacer |
| import androidx.compose.ui.drawBehind |
| |
| /** |
| * Component that allow you to specify an area on the screen and perform canvas drawing on this |
| * area. You MUST specify size with modifier, whether with exact sizes via [LayoutSize] modifier, |
| * or relative to parent, via [LayoutSize.Fill], [ColumnScope.LayoutWeight], etc. If parent |
| * wraps this child, only exact sizes must be specified. |
| * |
| * @sample androidx.compose.foundation.samples.CanvasSample |
| * |
| * @param modifier mandatory modifier to specify size strategy for this composable |
| * @param onCanvas lambda that will be called to perform drawing. Note that this lambda will be |
| * called during draw stage, you have no access to composition scope, meaning that [Composable] |
| * function invocation inside it will result to runtime exception |
| */ |
| @Composable |
| fun Canvas(modifier: Modifier, onCanvas: DrawScope.() -> Unit) = |
| Spacer(modifier.drawBehind(onCanvas)) |