New feature “Text and reading options” for SetupWizard, Wallpaper, and Settings (13/n).

- Add the ResetPreference for controlling all preferences state in the text and reading options page.
1) Create a new interface ResetStateListener for the other preferences.

- Link-up between the reset, font size, and display size preferences.

Bug: 211503117
Test: make RunSettingsRoboTests ROBOTEST_FILTER=PreviewSizeSeekBarControllerTest
Test: make RunSettingsRoboTests ROBOTEST_FILTER=TextReadingResetControllerTest
Change-Id: Ida773967834e32737b1daac885a2dd71189d32c8

src/com/android/settings/accessibility/PreviewSizeSeekBarController.java

@@ -29,10 +29,12 @@ import com.android.settings.widget.LabeledSeekBarPreference;
  * The controller of {@link LabeledSeekBarPreference} that listens to display size and font size
  * settings changes and updates preview size threshold smoothly.
  */
-class PreviewSizeSeekBarController extends BasePreferenceController {
+class PreviewSizeSeekBarController extends BasePreferenceController implements
+        TextReadingResetController.ResetStateListener {
     private final PreviewSizeData<? extends Number> mSizeData;
     private boolean mSeekByTouch;
     private ProgressInteractionListener mInteractionListener;
+    private LabeledSeekBarPreference mSeekBarPreference;
 
     private final SeekBar.OnSeekBarChangeListener mSeekBarChangeListener =
             new SeekBar.OnSeekBarChangeListener() {
@@ -81,13 +83,17 @@ class PreviewSizeSeekBarController extends BasePreferenceController {
 
         final int dataSize = mSizeData.getValues().size();
         final int initialIndex = mSizeData.getInitialIndex();
-        final LabeledSeekBarPreference seekBarPreference =
-                screen.findPreference(getPreferenceKey());
+        mSeekBarPreference = screen.findPreference(getPreferenceKey());
+        mSeekBarPreference.setMax(dataSize - 1);
+        mSeekBarPreference.setProgress(initialIndex);
+        mSeekBarPreference.setContinuousUpdates(true);
+        mSeekBarPreference.setOnSeekBarChangeListener(mSeekBarChangeListener);
+    }
 
-        seekBarPreference.setMax(dataSize - 1);
-        seekBarPreference.setProgress(initialIndex);
-        seekBarPreference.setContinuousUpdates(true);
-        seekBarPreference.setOnSeekBarChangeListener(mSeekBarChangeListener);
+    @Override
+    public void resetState() {
+        final int defaultProgress = mSizeData.getValues().indexOf(mSizeData.getDefaultValue());
+        mSeekBarPreference.setProgress(defaultProgress);
     }
 
     /**

src/com/android/settings/accessibility/TextReadingPreferenceFragment.java

@@ -16,6 +16,8 @@
 
 package com.android.settings.accessibility;
 
+import static com.android.settings.accessibility.TextReadingResetController.ResetStateListener;
+
 import android.app.settings.SettingsEnums;
 import android.content.Context;
 
@@ -27,6 +29,7 @@ import com.android.settingslib.search.SearchIndexable;
 
 import java.util.ArrayList;
 import java.util.List;
+import java.util.stream.Collectors;
 
 /**
  * Accessibility settings for adjusting the system features which are related to the reading. For
@@ -38,6 +41,7 @@ public class TextReadingPreferenceFragment extends DashboardFragment {
     private static final String FONT_SIZE_KEY = "font_size";
     private static final String DISPLAY_SIZE_KEY = "display_size";
     private static final String PREVIEW_KEY = "preview";
+    private static final String RESET_KEY = "reset";
 
     @Override
     protected int getPreferenceScreenResId() {
@@ -74,6 +78,13 @@ public class TextReadingPreferenceFragment extends DashboardFragment {
         displaySizeController.setInteractionListener(previewController);
         controllers.add(displaySizeController);
 
+        final List<ResetStateListener> resetStateListeners =
+                controllers.stream().filter(c -> c instanceof ResetStateListener).map(
+                        c -> (ResetStateListener) c).collect(Collectors.toList());
+        final TextReadingResetController resetController =
+                new TextReadingResetController(context, RESET_KEY, resetStateListeners);
+        controllers.add(resetController);
+
         return controllers;
     }
 

src/com/android/settings/accessibility/TextReadingResetController.java

@@ -0,0 +1,66 @@
+/*
+ * 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.settings.accessibility;
+
+import android.content.Context;
+import android.view.View;
+
+import androidx.annotation.NonNull;
+import androidx.preference.PreferenceScreen;
+
+import com.android.settings.R;
+import com.android.settings.core.BasePreferenceController;
+import com.android.settingslib.widget.LayoutPreference;
+
+import java.util.List;
+
+/**
+ * The controller of the reset button in the text and reading options page.
+ */
+class TextReadingResetController extends BasePreferenceController {
+    private final List<ResetStateListener> mListeners;
+
+    TextReadingResetController(Context context, String preferenceKey,
+            @NonNull List<ResetStateListener> listeners) {
+        super(context, preferenceKey);
+        mListeners = listeners;
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return AVAILABLE;
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        super.displayPreference(screen);
+
+        final LayoutPreference layoutPreference = screen.findPreference(getPreferenceKey());
+        final View view = layoutPreference.findViewById(R.id.reset_button);
+        view.setOnClickListener(v -> mListeners.forEach(ResetStateListener::resetState));
+    }
+
+    /**
+     * Interface for resetting to default state.
+     */
+    interface ResetStateListener {
+        /**
+         * Called when the reset button was clicked.
+         */
+        void resetState();
+    }
+}