Adding Settings preference for single finger panning feature

Test: Locally tested on device +
MagnificationOneFingerPanningPreferenceControllerTest
Bug: 282039824

Change-Id: I1d1a649060cba862c8f333e6e76184fade2dcdce

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

@@ -0,0 +1,102 @@
+/*
+ * Copyright (C) 2024 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 static com.android.settings.accessibility.AccessibilityUtil.State.OFF;
+import static com.android.settings.accessibility.AccessibilityUtil.State.ON;
+
+import android.content.Context;
+import android.content.res.Resources;
+import android.provider.Settings;
+
+import androidx.annotation.Nullable;
+import androidx.annotation.VisibleForTesting;
+import androidx.preference.PreferenceScreen;
+import androidx.preference.TwoStatePreference;
+
+import com.android.server.accessibility.Flags;
+import com.android.settings.R;
+import com.android.settings.core.TogglePreferenceController;
+
+public class MagnificationOneFingerPanningPreferenceController
+        extends TogglePreferenceController {
+    static final String PREF_KEY = Settings.Secure.ACCESSIBILITY_SINGLE_FINGER_PANNING_ENABLED;
+
+    @Nullable
+    private TwoStatePreference mSwitchPreference;
+
+    @VisibleForTesting
+    final boolean mDefaultValue;
+
+    public MagnificationOneFingerPanningPreferenceController(Context context) {
+        super(context, PREF_KEY);
+        boolean defaultValue;
+        try {
+            defaultValue = context.getResources().getBoolean(
+                    com.android.internal.R.bool.config_enable_a11y_magnification_single_panning);
+        } catch (Resources.NotFoundException e) {
+            defaultValue = false;
+        }
+        mDefaultValue = defaultValue;
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return (Flags.enableMagnificationOneFingerPanningGesture())
+                ? AVAILABLE : DISABLED_FOR_USER;
+    }
+
+    @Override
+    public boolean isChecked() {
+        return Settings.Secure.getInt(
+                mContext.getContentResolver(),
+                PREF_KEY,
+                (mDefaultValue) ? ON : OFF) == ON;
+    }
+
+    @Override
+    public boolean setChecked(boolean isChecked) {
+        var toReturn = Settings.Secure.putInt(mContext.getContentResolver(),
+                PREF_KEY,
+                (isChecked ? ON : OFF));
+        if (mSwitchPreference != null) {
+            refreshSummary(mSwitchPreference);
+        }
+        return toReturn;
+    }
+
+    @Override
+    public CharSequence getSummary() {
+        return (isChecked())
+                ? mContext.getString(
+                        R.string.accessibility_magnification_one_finger_panning_summary_on)
+                : mContext.getString(
+                        R.string.accessibility_magnification_one_finger_panning_summary_off);
+    }
+
+    @Override
+    public int getSliceHighlightMenuRes() {
+        return R.string.menu_key_accessibility;
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        super.displayPreference(screen);
+        mSwitchPreference = screen.findPreference(getPreferenceKey());
+        refreshSummary(mSwitchPreference);
+    }
+}

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

@@ -200,6 +200,7 @@ public class ToggleScreenMagnificationPreferenceFragment extends
         final PreferenceCategory generalCategory = findPreference(KEY_GENERAL_CATEGORY);
         generalCategory.addPreference(mSettingsPreference);
 
+        addOneFingerPanningSetting(generalCategory);
         final MagnificationModePreferenceController magnificationModePreferenceController =
                 new MagnificationModePreferenceController(getContext(),
                         MagnificationModePreferenceController.PREF_KEY);
@@ -283,6 +284,24 @@ public class ToggleScreenMagnificationPreferenceFragment extends
         addPreferenceController(alwaysOnPreferenceController);
     }
 
+    private void addOneFingerPanningSetting(PreferenceCategory generalCategory) {
+        if (!Flags.enableMagnificationOneFingerPanningGesture()) {
+            return;
+        }
+
+        var oneFingerPanningPreference = new SwitchPreferenceCompat(getPrefContext());
+        oneFingerPanningPreference.setTitle(
+                R.string.accessibility_magnification_one_finger_panning_title);
+        oneFingerPanningPreference.setKey(
+                MagnificationOneFingerPanningPreferenceController.PREF_KEY);
+        generalCategory.addPreference(oneFingerPanningPreference);
+
+        var oneFingerPanningPreferenceController =
+                new MagnificationOneFingerPanningPreferenceController(getContext());
+        oneFingerPanningPreferenceController.displayPreference(getPreferenceScreen());
+        addPreferenceController(oneFingerPanningPreferenceController);
+    }
+
     private void addJoystickSetting(PreferenceCategory generalCategory) {
         if (!DeviceConfig.getBoolean(
                 DeviceConfig.NAMESPACE_WINDOW_MANAGER,