| /* |
| * 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.core.demos.gestures |
| |
| import androidx.compose.Composable |
| import androidx.compose.state |
| import androidx.ui.core.Alignment |
| import androidx.ui.core.Modifier |
| import androidx.ui.core.gesture.ScaleObserver |
| import androidx.ui.core.gesture.scaleGestureFilter |
| import androidx.compose.foundation.Box |
| import androidx.compose.foundation.Text |
| import androidx.compose.ui.graphics.Color |
| import androidx.compose.foundation.layout.Column |
| import androidx.compose.foundation.layout.fillMaxSize |
| import androidx.compose.foundation.layout.preferredSize |
| import androidx.compose.foundation.layout.wrapContentSize |
| import androidx.compose.ui.unit.dp |
| |
| /** |
| * Simple [scaleGestureFilter] demo. |
| */ |
| @Composable |
| fun ScaleGestureFilterDemo() { |
| val size = state { 192.dp } |
| |
| val scaleObserver = object : ScaleObserver { |
| override fun onScale(scaleFactor: Float) { |
| size.value *= scaleFactor |
| } |
| } |
| |
| Column { |
| Text("Demonstrates the scale gesture detector!") |
| Text("This is only scaling, not translating.") |
| Box( |
| Modifier.fillMaxSize() |
| .wrapContentSize(Alignment.Center) |
| .preferredSize(size.value) |
| .scaleGestureFilter(scaleObserver), |
| backgroundColor = Color(0xFF9e9e9e.toInt()) |
| ) |
| } |
| } |