Resep Panel Pendukung Material

Resep ini menunjukkan cara membuat tata letak adaptif dengan panel utama dan panel pendukung menggunakan SupportingPaneSceneStrategy dari library Adaptif Material 3. Tata letak ini berguna untuk menampilkan konten tambahan bersama konten utama di layar yang lebih besar.

Cara kerjanya

Contoh ini memiliki tiga tujuan: MainVideo, RelatedVideos, dan Profile.

SupportingPaneSceneStrategy

rememberSupportingPaneSceneStrategy menyediakan logika untuk tata letak adaptif ini.

  • Peran Panel: Setiap tujuan diberi peran menggunakan metadata:

    • SupportingPaneSceneStrategy.mainPane(): Untuk konten utama. Panel ini selalu terlihat.
    • SupportingPaneSceneStrategy.supportingPane(): Untuk konten tambahan. Panel ini ditampilkan bersama panel utama di layar yang lebih besar.
    • SupportingPaneSceneStrategy.extraPane(): Untuk konten tersier yang dapat ditampilkan bersama panel pendukung di layar yang lebih besar.

  • Tata Letak Adaptif: SupportingPaneSceneStrategy menangani tata letak secara otomatis. Di layar yang lebih kecil, hanya panel utama yang ditampilkan. Di layar yang lebih besar, panel pendukung ditampilkan di samping panel utama.

  • Navigasi Kembali: BackNavigationBehavior disesuaikan dalam contoh ini menjadi PopUntilCurrentDestinationChange. Artinya, saat pengguna menekan tombol kembali, panel pendukung akan ditutup, sehingga menampilkan panel utama di bawahnya.

  • Navigasi: Navigasi ditangani dengan menambahkan dan menghapus tujuan dari data sebelumnya. SupportingPaneSceneStrategy mengamati perubahan ini dan menyesuaikan tata letak yang sesuai.

package com.example.nav3recipes.material.supportingpane

/*
 * Copyright 2025 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
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import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.layout.Column
import androidx.compose.material3.Button
import androidx.compose.material3.Text
import androidx.compose.material3.adaptive.ExperimentalMaterial3AdaptiveApi
import androidx.compose.material3.adaptive.currentWindowAdaptiveInfoV2
import androidx.compose.material3.adaptive.layout.calculatePaneScaffoldDirective
import androidx.compose.material3.adaptive.navigation.BackNavigationBehavior
import androidx.compose.material3.adaptive.navigation3.SupportingPaneSceneStrategy
import androidx.compose.material3.adaptive.navigation3.rememberSupportingPaneSceneStrategy
import androidx.compose.runtime.remember
import androidx.compose.ui.Alignment
import androidx.compose.ui.unit.dp
import androidx.lifecycle.compose.dropUnlessResumed
import androidx.navigation3.runtime.NavKey
import androidx.navigation3.runtime.entryProvider
import androidx.navigation3.runtime.rememberNavBackStack
import androidx.navigation3.ui.NavDisplay
import com.example.nav3recipes.content.ContentBlue
import com.example.nav3recipes.content.ContentGreen
import com.example.nav3recipes.content.ContentRed
import com.example.nav3recipes.ui.setEdgeToEdgeConfig
import kotlinx.serialization.Serializable

@Serializable
private object MainVideo : NavKey

@Serializable
private data object RelatedVideos : NavKey

@Serializable
private data object Profile : NavKey

class MaterialSupportingPaneActivity : ComponentActivity() {

    @OptIn(ExperimentalMaterial3AdaptiveApi::class)
    override fun onCreate(savedInstanceState: Bundle?) {
        setEdgeToEdgeConfig()
        super.onCreate(savedInstanceState)

        setContent {

            val backStack = rememberNavBackStack(MainVideo)

            // Override the defaults so that there isn't a horizontal or vertical space between the panes.
            // See b/444438086
            val windowAdaptiveInfo = currentWindowAdaptiveInfoV2()
            val directive = remember(windowAdaptiveInfo) {
                calculatePaneScaffoldDirective(windowAdaptiveInfo)
                    .copy(horizontalPartitionSpacerSize = 0.dp, verticalPartitionSpacerSize = 0.dp)
            }

            // Override the defaults so that the supporting pane can be dismissed by pressing back.
            // See b/445826749
            val supportingPaneStrategy = rememberSupportingPaneSceneStrategy<NavKey>(
                backNavigationBehavior = BackNavigationBehavior.PopUntilCurrentDestinationChange,
                directive = directive
            )

            NavDisplay(
                backStack = backStack,
                onBack = { backStack.removeLastOrNull() },
                sceneStrategies = listOf(supportingPaneStrategy),
                entryProvider = entryProvider {
                    entry<MainVideo>(
                        metadata = SupportingPaneSceneStrategy.mainPane()
                    ) {
                        ContentRed("Video content") {
                            Button(onClick = dropUnlessResumed {
                                backStack.add(RelatedVideos)
                            }) {
                                Text("View related videos")
                            }
                        }
                    }
                    entry<RelatedVideos>(
                        metadata = SupportingPaneSceneStrategy.supportingPane()
                    ) {
                        ContentBlue("Related videos") {
                            Column(horizontalAlignment = Alignment.CenterHorizontally) {
                                Button(onClick = dropUnlessResumed {
                                    backStack.add(Profile)
                                }) {
                                    Text("View profile")
                                }
                            }
                        }
                    }
                    entry<Profile>(
                        metadata = SupportingPaneSceneStrategy.extraPane()
                    ) {
                        ContentGreen("Profile")
                    }
                }
            )
        }
    }
}