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InterestsScreen.kt
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InterestsScreen.kt
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/*
* Copyright 2021 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
*
* https://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 com.google.samples.apps.nowinandroid.feature.interests
import androidx.compose.foundation.layout.Column
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.tooling.preview.PreviewParameter
import androidx.hilt.navigation.compose.hiltViewModel
import androidx.lifecycle.compose.collectAsStateWithLifecycle
import com.google.samples.apps.nowinandroid.core.designsystem.component.NiaBackground
import com.google.samples.apps.nowinandroid.core.designsystem.component.NiaLoadingWheel
import com.google.samples.apps.nowinandroid.core.designsystem.theme.NiaTheme
import com.google.samples.apps.nowinandroid.core.model.data.FollowableTopic
import com.google.samples.apps.nowinandroid.core.ui.DevicePreviews
import com.google.samples.apps.nowinandroid.core.ui.FollowableTopicPreviewParameterProvider
import com.google.samples.apps.nowinandroid.core.ui.TrackScreenViewEvent
@Composable
fun InterestsRoute(
onTopicClick: (String) -> Unit,
modifier: Modifier = Modifier,
highlightSelectedTopic: Boolean = false,
viewModel: InterestsViewModel = hiltViewModel(),
) {
val uiState by viewModel.uiState.collectAsStateWithLifecycle()
InterestsScreen(
uiState = uiState,
followTopic = viewModel::followTopic,
onTopicClick = onTopicClick,
highlightSelectedTopic = highlightSelectedTopic,
modifier = modifier,
)
}
@Composable
internal fun InterestsScreen(
uiState: InterestsUiState,
followTopic: (String, Boolean) -> Unit,
onTopicClick: (String) -> Unit,
modifier: Modifier = Modifier,
highlightSelectedTopic: Boolean = false,
) {
Column(
modifier = modifier,
horizontalAlignment = Alignment.CenterHorizontally,
) {
when (uiState) {
InterestsUiState.Loading ->
NiaLoadingWheel(
modifier = modifier,
contentDesc = stringResource(id = R.string.feature_interests_loading),
)
is InterestsUiState.Interests ->
TopicsTabContent(
topics = uiState.topics,
onTopicClick = onTopicClick,
onFollowButtonClick = followTopic,
selectedTopicId = uiState.selectedTopicId,
highlightSelectedTopic = highlightSelectedTopic,
modifier = modifier,
)
is InterestsUiState.Empty -> InterestsEmptyScreen()
}
}
TrackScreenViewEvent(screenName = "Interests")
}
@Composable
private fun InterestsEmptyScreen() {
Text(text = stringResource(id = R.string.feature_interests_empty_header))
}
@DevicePreviews
@Composable
fun InterestsScreenPopulated(
@PreviewParameter(FollowableTopicPreviewParameterProvider::class)
followableTopics: List<FollowableTopic>,
) {
NiaTheme {
NiaBackground {
InterestsScreen(
uiState = InterestsUiState.Interests(
selectedTopicId = null,
topics = followableTopics,
),
followTopic = { _, _ -> },
onTopicClick = {},
)
}
}
}
@DevicePreviews
@Composable
fun InterestsScreenLoading() {
NiaTheme {
NiaBackground {
InterestsScreen(
uiState = InterestsUiState.Loading,
followTopic = { _, _ -> },
onTopicClick = {},
)
}
}
}
@DevicePreviews
@Composable
fun InterestsScreenEmpty() {
NiaTheme {
NiaBackground {
InterestsScreen(
uiState = InterestsUiState.Empty,
followTopic = { _, _ -> },
onTopicClick = {},
)
}
}
}