| /* |
| * 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.samples |
| |
| import androidx.annotation.Sampled |
| import androidx.compose.foundation.BorderStroke |
| import androidx.compose.foundation.Interaction |
| import androidx.compose.foundation.InteractionState |
| import androidx.compose.foundation.LocalIndication |
| import androidx.compose.foundation.border |
| import androidx.compose.foundation.clickable |
| import androidx.compose.foundation.gestures.Orientation |
| import androidx.compose.foundation.gestures.draggable |
| import androidx.compose.foundation.gestures.rememberDraggableState |
| import androidx.compose.foundation.layout.Box |
| import androidx.compose.foundation.layout.Column |
| import androidx.compose.foundation.layout.Row |
| import androidx.compose.foundation.layout.fillMaxSize |
| import androidx.compose.foundation.layout.padding |
| import androidx.compose.foundation.layout.preferredSize |
| import androidx.compose.foundation.layout.wrapContentSize |
| import androidx.compose.material.LocalTextStyle |
| import androidx.compose.material.Text |
| import androidx.compose.runtime.Composable |
| import androidx.compose.runtime.remember |
| import androidx.compose.ui.Modifier |
| import androidx.compose.ui.graphics.Color |
| import androidx.compose.ui.text.style.TextAlign |
| import androidx.compose.ui.unit.dp |
| |
| @Sampled |
| @Composable |
| fun PriorityInteractionStateSample() { |
| val interactionState = remember { InteractionState() } |
| |
| val draggable = Modifier.draggable( |
| orientation = Orientation.Horizontal, |
| interactionState = interactionState, |
| state = rememberDraggableState { /* update some business state here */ } |
| ) |
| |
| // Use InteractionState to determine how this component should appear during transient UI states |
| // In this example we are using a 'priority' system, such that we ignore multiple states, and |
| // don't care about the most recent state - Dragged is more important than Pressed. |
| val (text, color) = when { |
| Interaction.Dragged in interactionState -> "Dragged" to Color.Red |
| Interaction.Pressed in interactionState -> "Pressed" to Color.Blue |
| // Default / baseline state |
| else -> "Drag me horizontally, or press me!" to Color.Black |
| } |
| |
| Box( |
| Modifier |
| .fillMaxSize() |
| .wrapContentSize() |
| .preferredSize(width = 240.dp, height = 80.dp) |
| ) { |
| Box( |
| Modifier |
| .fillMaxSize() |
| .clickable( |
| interactionState = interactionState, |
| indication = LocalIndication.current |
| ) { /* do nothing */ } |
| .then(draggable) |
| .border(BorderStroke(3.dp, color)) |
| .padding(3.dp) |
| ) { |
| Text( |
| text, style = LocalTextStyle.current.copy(textAlign = TextAlign.Center), |
| modifier = Modifier.fillMaxSize().wrapContentSize() |
| ) |
| } |
| } |
| } |
| |
| @Sampled |
| @Composable |
| fun MultipleInteractionStateSample() { |
| val interactionState = remember { InteractionState() } |
| |
| val draggable = Modifier.draggable( |
| orientation = Orientation.Horizontal, |
| interactionState = interactionState, |
| state = rememberDraggableState { /* update some business state here */ } |
| ) |
| |
| val clickable = Modifier.clickable( |
| interactionState = interactionState, |
| indication = LocalIndication.current |
| ) { |
| /* update some business state here */ |
| } |
| |
| // In this example we have a complex component that can be in multiple states at the same time |
| // (both pressed and dragged, since different areas of the same component can be pressed and |
| // dragged at the same time), and we want to use only the most recent state to show the visual |
| // state of the component. This could be with a visual overlay, or similar. Note that the most |
| // recent state is the _last_ state added to interactionState, so we want to start from the end, |
| // hence we use `lastOrNull` and not `firstOrNull`. |
| val latestState = interactionState.value.lastOrNull { |
| // We only care about pressed and dragged states here, so ignore everything else |
| it is Interaction.Dragged || it is Interaction.Pressed |
| } |
| |
| val text = when (latestState) { |
| Interaction.Dragged -> "Dragged" |
| Interaction.Pressed -> "Pressed" |
| else -> "No state" |
| } |
| |
| Column( |
| Modifier |
| .fillMaxSize() |
| .wrapContentSize() |
| ) { |
| Row { |
| Box( |
| Modifier |
| .preferredSize(width = 240.dp, height = 80.dp) |
| .then(clickable) |
| .border(BorderStroke(3.dp, Color.Blue)) |
| .padding(3.dp) |
| ) { |
| val pressed = Interaction.Pressed in interactionState |
| Text( |
| text = if (pressed) "Pressed" else "Not pressed", |
| style = LocalTextStyle.current.copy(textAlign = TextAlign.Center), |
| modifier = Modifier.fillMaxSize().wrapContentSize() |
| ) |
| } |
| Box( |
| Modifier |
| .preferredSize(width = 240.dp, height = 80.dp) |
| .then(draggable) |
| .border(BorderStroke(3.dp, Color.Red)) |
| .padding(3.dp) |
| ) { |
| val dragged = Interaction.Dragged in interactionState |
| Text( |
| text = if (dragged) "Dragged" else "Not dragged", |
| style = LocalTextStyle.current.copy(textAlign = TextAlign.Center), |
| modifier = Modifier.fillMaxSize().wrapContentSize() |
| ) |
| } |
| } |
| Text( |
| text = text, |
| style = LocalTextStyle.current.copy(textAlign = TextAlign.Center), |
| modifier = Modifier.fillMaxSize().wrapContentSize() |
| ) |
| } |
| } |