chore(magnification suw): create MagnificationFeaturePreferenceController

Add a new abstract class MagnificationFeaturePreferenceController
that extends TogglePreferenceController, to wrap inSetupWizard
setter/getter. Then for magnification feature preference controllers
like alwaysOn or followTyping, they can just check isInSetupWizard to
decide whether hiding in setup wizard.

Besides, in ToggleScreenMagnificationPreferenceFragment we cache a flag
mInSetupWizard when fragment created, so we can pass the info to the
preferece controllers when creating them.

Bug: 340721852
Flag: NONE
Test: build pass
Change-Id: I05c59a766219862117d2a6ede775d68a4c3dedac

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

@@ -0,0 +1,42 @@
+/*
+ * 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 android.content.Context;
+
+import com.android.settings.core.TogglePreferenceController;
+
+/**
+ * A base preference controller of magnification feature with common methods.
+ */
+public abstract class MagnificationFeaturePreferenceController extends TogglePreferenceController {
+
+    private boolean mInSetupWizard;
+
+    protected MagnificationFeaturePreferenceController(Context context,
+            String preferenceKey) {
+        super(context, preferenceKey);
+    }
+
+    protected final boolean isInSetupWizard() {
+        return mInSetupWizard;
+    }
+
+    protected final void setInSetupWizard(boolean inSetupWizard) {
+        mInSetupWizard = inSetupWizard;
+    }
+}