Refactor PrintSettings (2/n)

The "Add service" button.

Bug: 320076351
Flag: com.android.settings.flags.refactor_print_settings
Test: manual
Test: unit test
Change-Id: I624293edcbfe9ef8388d48759611aeac522352a4

src/com/android/settings/print/PrintSettingsPageProvider.kt

@@ -17,16 +17,32 @@
 package com.android.settings.print
 
 import android.app.settings.SettingsEnums
+import android.content.Context
+import android.content.Intent
+import android.net.Uri
 import android.os.Bundle
+import android.provider.Settings
 import androidx.annotation.VisibleForTesting
 import androidx.compose.foundation.Image
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.outlined.Add
+import androidx.compose.material.icons.outlined.Print
+import androidx.compose.material3.Icon
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.remember
+import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.alpha
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.unit.dp
 import androidx.core.os.bundleOf
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import com.android.settings.R
@@ -36,13 +52,18 @@ import com.android.settings.print.PrintSettingsFragment.EXTRA_CHECKED
 import com.android.settings.print.PrintSettingsFragment.EXTRA_SERVICE_COMPONENT_NAME
 import com.android.settings.print.PrintSettingsFragment.EXTRA_TITLE
 import com.android.settingslib.spa.framework.common.SettingsPageProvider
+import com.android.settingslib.spa.framework.compose.rememberContext
 import com.android.settingslib.spa.framework.compose.rememberDrawablePainter
 import com.android.settingslib.spa.framework.theme.SettingsDimension
+import com.android.settingslib.spa.framework.theme.SettingsOpacity
 import com.android.settingslib.spa.widget.preference.Preference
 import com.android.settingslib.spa.widget.preference.PreferenceModel
 import com.android.settingslib.spa.widget.scaffold.RegularScaffold
 import com.android.settingslib.spa.widget.ui.Category
+import com.android.settingslib.spa.widget.ui.SettingsIcon
+import com.android.settingslib.spaprivileged.settingsprovider.settingsSecureStringFlow
 import com.android.settingslib.spaprivileged.template.common.UserProfilePager
+import kotlinx.coroutines.flow.Flow
 
 object PrintSettingsPageProvider : SettingsPageProvider {
     override val name = "PrintSettings"
@@ -52,51 +73,101 @@ object PrintSettingsPageProvider : SettingsPageProvider {
         RegularScaffold(title = stringResource(R.string.print_settings)) {
             val context = LocalContext.current
             val printRepository = remember(context) { PrintRepository(context) }
-            UserProfilePager {
-                PrintServices(printRepository)
-            }
+            UserProfilePager { PrintServices(printRepository) }
         }
     }
 
     @Composable
     private fun PrintServices(printRepository: PrintRepository) {
-        val printServiceDisplayInfos by remember {
-            printRepository.printServiceDisplayInfosFlow()
-        }.collectAsStateWithLifecycle(initialValue = emptyList())
-        Category(title = stringResource(R.string.print_settings_title)) {
-            for (printServiceDisplayInfo in printServiceDisplayInfos) {
-                PrintService(printServiceDisplayInfo)
+        val printServiceDisplayInfos by
+            remember { printRepository.printServiceDisplayInfosFlow() }
+                .collectAsStateWithLifecycle(initialValue = emptyList())
+        if (printServiceDisplayInfos.isEmpty()) {
+            NoServicesInstalled()
+        } else {
+            Category(title = stringResource(R.string.print_settings_title)) {
+                for (printServiceDisplayInfo in printServiceDisplayInfos) {
+                    PrintService(printServiceDisplayInfo)
+                }
             }
         }
+        AddPrintService()
+    }
+
+    @Composable
+    private fun NoServicesInstalled() {
+        Column(
+            modifier = Modifier.fillMaxSize().padding(SettingsDimension.itemPaddingAround),
+            horizontalAlignment = Alignment.CenterHorizontally,
+        ) {
+            Icon(
+                imageVector = Icons.Outlined.Print,
+                contentDescription = null,
+                modifier =
+                    Modifier.size(110.dp)
+                        .padding(SettingsDimension.itemPaddingAround)
+                        .alpha(SettingsOpacity.SurfaceTone),
+            )
+            Text(
+                text = stringResource(R.string.print_no_services_installed),
+                style = MaterialTheme.typography.titleLarge,
+            )
+        }
     }
 
     @VisibleForTesting
     @Composable
     fun PrintService(displayInfo: PrintServiceDisplayInfo) {
         val context = LocalContext.current
-        Preference(model = object : PreferenceModel {
-            override val title = displayInfo.title
-            override val summary = { displayInfo.summary }
-            override val icon: @Composable () -> Unit = {
-                Image(
-                    painter = rememberDrawablePainter(displayInfo.icon),
-                    contentDescription = null,
-                    modifier = Modifier.size(SettingsDimension.appIconItemSize),
-                )
-            }
-            override val onClick = {
-                SubSettingLauncher(context).apply {
-                    setDestination(PrintServiceSettingsFragment::class.qualifiedName)
-                    setArguments(
-                        bundleOf(
-                            EXTRA_CHECKED to displayInfo.isEnabled,
-                            EXTRA_TITLE to displayInfo.title,
-                            EXTRA_SERVICE_COMPONENT_NAME to displayInfo.componentName
-                        )
+        Preference(
+            object : PreferenceModel {
+                override val title = displayInfo.title
+                override val summary = { displayInfo.summary }
+                override val icon: @Composable () -> Unit = {
+                    Image(
+                        painter = rememberDrawablePainter(displayInfo.icon),
+                        contentDescription = null,
+                        modifier = Modifier.size(SettingsDimension.appIconItemSize),
                     )
-                    setSourceMetricsCategory(SettingsEnums.PRINT_SETTINGS)
-                }.launch()
+                }
+                override val onClick = { launchPrintServiceSettings(context, displayInfo) }
             }
-        })
+        )
+    }
+
+    private fun launchPrintServiceSettings(context: Context, displayInfo: PrintServiceDisplayInfo) {
+        SubSettingLauncher(context)
+            .apply {
+                setDestination(PrintServiceSettingsFragment::class.qualifiedName)
+                setArguments(
+                    bundleOf(
+                        EXTRA_CHECKED to displayInfo.isEnabled,
+                        EXTRA_TITLE to displayInfo.title,
+                        EXTRA_SERVICE_COMPONENT_NAME to displayInfo.componentName
+                    )
+                )
+                setSourceMetricsCategory(SettingsEnums.PRINT_SETTINGS)
+            }
+            .launch()
+    }
+
+    @Composable
+    fun AddPrintService(
+        searchUriFlow: Flow<String> = rememberContext { context ->
+            context.settingsSecureStringFlow(Settings.Secure.PRINT_SERVICE_SEARCH_URI)
+        },
+    ) {
+        val context = LocalContext.current
+        val searchUri by searchUriFlow.collectAsStateWithLifecycle("")
+        if (searchUri.isEmpty()) return
+        Preference(
+            object : PreferenceModel {
+                override val title = stringResource(R.string.print_menu_item_add_service)
+                override val icon = @Composable { SettingsIcon(imageVector = Icons.Outlined.Add) }
+                override val onClick = {
+                    context.startActivity(Intent(Intent.ACTION_VIEW, Uri.parse(searchUri)))
+                }
+            }
+        )
     }
 }