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android / platform / frameworks / support / 4dc4dac506f66d61fff03f2e2e327c21f22c769f / . / ui / ui-core / integration-tests / ui-core-demos / src / main / java / androidx / ui / core / demos / gestures / DragScaleGestureDetectorDemo.kt
blob: e29af96617b15a5a13d97a0cf48f112ef073e116 [file] [log] [blame]
shepshapardb14d6432019-08-05 17:13:22 -0700[diff] [blame]1/*
2 * Copyright 2019 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
George Mount54370f12020-05-06 16:03:20 -0700[diff] [blame]17package androidx.ui.core.demos.gestures
shepshapardb14d6432019-08-05 17:13:22 -0700[diff] [blame]18
Louis Pullen-Freilicha228adf2020-03-11 18:42:11 +0000[diff] [blame]19import androidx.compose.Composable
shepshapardb14d6432019-08-05 17:13:22 -0700[diff] [blame]20import androidx.compose.state
Adam Powell999a89b2020-03-11 09:08:07 -0700[diff] [blame]21import androidx.ui.core.Alignment
Shep Shapard89316462020-03-03 17:00:52 -0800[diff] [blame]22import androidx.ui.core.DensityAmbient
Adam Powell999a89b2020-03-11 09:08:07 -0700[diff] [blame]23import androidx.ui.core.Modifier
shepshapardb14d6432019-08-05 17:13:22 -0700[diff] [blame]24import androidx.ui.core.gesture.DragObserver
shepshapardb14d6432019-08-05 17:13:22 -0700[diff] [blame]25import androidx.ui.core.gesture.ScaleObserver
Shep Shapard70a8cfe2020-03-30 16:17:26 -0700[diff] [blame]26import androidx.ui.core.gesture.dragGestureFilter
Shep Shapard07c9e2c2020-05-21 16:44:25 -0700[diff] [blame]27import androidx.ui.core.gesture.scaleGestureFilter
28import androidx.ui.core.gesture.tapGestureFilter
Louis Pullen-Freilichddda7be2020-07-17 18:28:12 +0100[diff] [blame]29import androidx.compose.foundation.Box
30import androidx.compose.foundation.Text
Louis Pullen-Freilich623e4052020-07-19 20:24:03 +0100[diff] [blame]31import androidx.compose.foundation.layout.Column
32import androidx.compose.foundation.layout.fillMaxSize
33import androidx.compose.foundation.layout.offset
34import androidx.compose.foundation.layout.preferredSize
35import androidx.compose.foundation.layout.wrapContentSize
Louis Pullen-Freilichf434a132020-07-22 14:19:24 +0100[diff] [blame]36import androidx.compose.ui.geometry.Offset
George Mount842c8c12020-01-08 16:03:42 -0800[diff] [blame]37import androidx.ui.unit.dp
shepshapardb14d6432019-08-05 17:13:22 -0700[diff] [blame]38
39/**
Shep Shapardca62bbb2020-05-15 16:20:52 -0700[diff] [blame]40 * Simple demo that shows off how [dragGestureFilter] and [scaleGestureFilter] automatically
shepshapardb14d6432019-08-05 17:13:22 -0700[diff] [blame]41 * interoperate.
42 */
Louis Pullen-Freilicha228adf2020-03-11 18:42:11 +0000[diff] [blame]43@Composable
Shep Shapardca62bbb2020-05-15 16:20:52 -0700[diff] [blame]44fun DragAndScaleGestureFilterDemo() {
Shep Shapard89316462020-03-03 17:00:52 -0800[diff] [blame]45 val size = state { 200.dp }
Nader Jawad6df06122020-06-03 15:27:08 -0700[diff] [blame]46 val offset = state { Offset.Zero }
Louis Pullen-Freilicha228adf2020-03-11 18:42:11 +0000[diff] [blame]47 val dragInScale = state { false }
shepshapardb14d6432019-08-05 17:13:22 -0700[diff] [blame]48
Louis Pullen-Freilicha228adf2020-03-11 18:42:11 +0000[diff] [blame]49 val scaleObserver = object : ScaleObserver {
50 override fun onScale(scaleFactor: Float) {
Shep Shapard89316462020-03-03 17:00:52 -0800[diff] [blame]51 size.value *= scaleFactor
Louis Pullen-Freilicha228adf2020-03-11 18:42:11 +0000[diff] [blame]52 }
53 }
54
55 val dragObserver = object : DragObserver {
Nader Jawad6df06122020-06-03 15:27:08 -0700[diff] [blame]56 override fun onDrag(dragDistance: Offset): Offset {
Shep Shapard89316462020-03-03 17:00:52 -0800[diff] [blame]57 offset.value += dragDistance
Louis Pullen-Freilicha228adf2020-03-11 18:42:11 +0000[diff] [blame]58 return dragDistance
59 }
60 }
61
Nader Jawad6df06122020-06-03 15:27:08 -0700[diff] [blame]62 val onRelease: (Offset) -> Unit = {
Louis Pullen-Freilicha228adf2020-03-11 18:42:11 +0000[diff] [blame]63 dragInScale.value = !dragInScale.value
64 }
65
Shep Shapard89316462020-03-03 17:00:52 -0800[diff] [blame]66 val gestures =
67 if (dragInScale.value) {
Shep Shapard70a8cfe2020-03-30 16:17:26 -0700[diff] [blame]68 Modifier
69 .scaleGestureFilter(scaleObserver)
70 .dragGestureFilter(dragObserver)
71 .tapGestureFilter(onRelease)
Shep Shapard89316462020-03-03 17:00:52 -0800[diff] [blame]72 } else {
Shep Shapard70a8cfe2020-03-30 16:17:26 -0700[diff] [blame]73 Modifier
74 .dragGestureFilter(dragObserver)
75 .scaleGestureFilter(scaleObserver)
76 .tapGestureFilter(onRelease)
Louis Pullen-Freilicha228adf2020-03-11 18:42:11 +0000[diff] [blame]77 }
Shep Shapard89316462020-03-03 17:00:52 -0800[diff] [blame]78
Shep Shapard07c9e2c2020-05-21 16:44:25 -0700[diff] [blame]79 val color =
80 if (dragInScale.value) {
81 Red
82 } else {
83 Blue
84 }
85
Shep Shapard89316462020-03-03 17:00:52 -0800[diff] [blame]86 val (offsetX, offsetY) =
87 with(DensityAmbient.current) { offset.value.x.toDp() to offset.value.y.toDp() }
88
Shep Shapard07c9e2c2020-05-21 16:44:25 -0700[diff] [blame]89 Column {
90 Text("Demonstrates combining dragging with scaling.")
91 Text("Drag and scale around. Play with how slop works for both dragging and scaling. Tap" +
92 " on the box to flip the order of scaling and dragging. The behavior is always " +
93 "the same because the 2 gesture filters are completely orthogonal.")
94 Box(
Shep Shapard78f42892020-05-20 16:02:06 -0700[diff] [blame]95 Modifier.fillMaxSize()
Shep Shapard07c9e2c2020-05-21 16:44:25 -0700[diff] [blame]96 .wrapContentSize(Alignment.Center)
Shep Shapard78f42892020-05-20 16:02:06 -0700[diff] [blame]97 .offset(offsetX, offsetY)
98 .preferredSize(size.value)
99 .plus(gestures),
Shep Shapard07c9e2c2020-05-21 16:44:25 -0700[diff] [blame]100 backgroundColor = color
101 )
102 }
Shep Shapard89316462020-03-03 17:00:52 -0800[diff] [blame]103}