Create HomeScaffold for SpaLib

Update the SpaLib Gallery to use the new HomeScaffold.

Bug: 235727273
Test: Manual with Gallery App
Change-Id: I5c5f6065b7192f659874432af55df075ef492e86

packages/SettingsLib/Spa/.idea/codeStyles/Project.xml

@@ -12,6 +12,7 @@
       </option>
       <option name="NAME_COUNT_TO_USE_STAR_IMPORT" value="2147483647" />
       <option name="NAME_COUNT_TO_USE_STAR_IMPORT_FOR_MEMBERS" value="2147483647" />
+      <option name="CODE_STYLE_DEFAULTS" value="KOTLIN_OFFICIAL" />
     </JetCodeStyleSettings>
     <XML>
       <option name="XML_KEEP_LINE_BREAKS" value="true" />
@@ -130,6 +131,7 @@
       </arrangement>
     </codeStyleSettings>
     <codeStyleSettings language="kotlin">
+      <option name="CODE_STYLE_DEFAULTS" value="KOTLIN_OFFICIAL" />
       <indentOptions>
         <option name="CONTINUATION_INDENT_SIZE" value="4" />
       </indentOptions>

packages/SettingsLib/Spa/gallery/src/com/android/settingslib/spa/gallery/MainActivity.kt

@@ -17,6 +17,5 @@
 package com.android.settingslib.spa.gallery
 
 import com.android.settingslib.spa.framework.SpaActivity
-import com.android.settingslib.spa.gallery.page.galleryPageRepository
 
 class MainActivity : SpaActivity(galleryPageRepository)

packages/SettingsLib/Spa/gallery/src/com/android/settingslib/spa/gallery/PageRepository.kt

@@ -14,9 +14,16 @@
  * limitations under the License.
  */
 
-package com.android.settingslib.spa.gallery.page
+package com.android.settingslib.spa.gallery
 
 import com.android.settingslib.spa.framework.api.SettingsPageRepository
+import com.android.settingslib.spa.gallery.home.HomePageProvider
+import com.android.settingslib.spa.gallery.page.ArgumentPageProvider
+import com.android.settingslib.spa.gallery.page.FooterPageProvider
+import com.android.settingslib.spa.gallery.page.PreferencePageProvider
+import com.android.settingslib.spa.gallery.page.SettingsPagerPageProvider
+import com.android.settingslib.spa.gallery.page.SliderPageProvider
+import com.android.settingslib.spa.gallery.page.SwitchPreferencePageProvider
 
 val galleryPageRepository = SettingsPageRepository(
     allPages = listOf(

packages/SettingsLib/Spa/gallery/src/com/android/settingslib/spa/gallery/home/HomePage.kt

@@ -14,21 +14,22 @@
  * limitations under the License.
  */
 
-package com.android.settingslib.spa.gallery.page
+package com.android.settingslib.spa.gallery.home
 
 import android.os.Bundle
-import androidx.compose.foundation.layout.Column
-import androidx.compose.foundation.layout.padding
-import androidx.compose.material3.MaterialTheme
-import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
-import androidx.compose.ui.Modifier
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.tooling.preview.Preview
 import com.android.settingslib.spa.framework.api.SettingsPageProvider
-import com.android.settingslib.spa.framework.theme.SettingsDimension
 import com.android.settingslib.spa.framework.theme.SettingsTheme
 import com.android.settingslib.spa.gallery.R
+import com.android.settingslib.spa.gallery.page.ArgumentPageProvider
+import com.android.settingslib.spa.gallery.page.FooterPageProvider
+import com.android.settingslib.spa.gallery.page.PreferencePageProvider
+import com.android.settingslib.spa.gallery.page.SettingsPagerPageProvider
+import com.android.settingslib.spa.gallery.page.SliderPageProvider
+import com.android.settingslib.spa.gallery.page.SwitchPreferencePageProvider
+import com.android.settingslib.spa.widget.scaffold.HomeScaffold
 
 object HomePageProvider : SettingsPageProvider {
     override val name = "Home"
@@ -41,14 +42,7 @@ object HomePageProvider : SettingsPageProvider {
 
 @Composable
 private fun HomePage() {
-    Column {
-        Text(
-            text = stringResource(R.string.app_name),
-            modifier = Modifier.padding(SettingsDimension.itemPadding),
-            color = MaterialTheme.colorScheme.onSurface,
-            style = MaterialTheme.typography.headlineMedium,
-        )
-
+    HomeScaffold(title = stringResource(R.string.app_name)) {
         PreferencePageProvider.EntryItem()
         SwitchPreferencePageProvider.EntryItem()
         ArgumentPageProvider.EntryItem(stringParam = "foo", intParam = 0)

packages/SettingsLib/Spa/spa/src/com/android/settingslib/spa/widget/scaffold/HomeScaffold.kt

@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2022 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 com.android.settingslib.spa.widget.scaffold
+
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
+import com.android.settingslib.spa.framework.theme.SettingsDimension
+
+@Composable
+fun HomeScaffold(title: String, content: @Composable () -> Unit) {
+    Column(
+        Modifier
+            .fillMaxSize()
+            .background(color = MaterialTheme.colorScheme.background)
+            .verticalScroll(rememberScrollState()),
+    ) {
+        Text(
+            text = title,
+            modifier = Modifier.padding(SettingsDimension.itemPadding),
+            color = MaterialTheme.colorScheme.onSurface,
+            style = MaterialTheme.typography.headlineMedium,
+        )
+
+        content()
+    }
+}