Move GearPreference to widget package.

- This is step1 of making gear preference more flexible to use.

Bug: 33579296
Test: builds
Change-Id: I30ac6c75f7ad16ec5c732fbb93170e5fab0eacb7

src/com/android/settings/widget/GearPreference.java

@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2017 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.widget;
+
+import android.content.Context;
+import android.support.v7.preference.PreferenceViewHolder;
+import android.util.AttributeSet;
+import android.view.View;
+
+import com.android.settings.R;
+import com.android.settingslib.RestrictedPreference;
+
+/**
+ * A preference with a Gear on the side
+ */
+public class GearPreference extends RestrictedPreference implements View.OnClickListener {
+
+    private OnGearClickListener mOnGearClickListener;
+
+    public GearPreference(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        setWidgetLayoutResource(R.layout.preference_widget_settings);
+    }
+
+    public void setOnGearClickListener(OnGearClickListener l) {
+        mOnGearClickListener = l;
+        notifyChanged();
+    }
+
+    @Override
+    public void onBindViewHolder(PreferenceViewHolder holder) {
+        super.onBindViewHolder(holder);
+        final View gear = holder.findViewById(R.id.settings_button);
+        gear.setOnClickListener(this);
+        gear.setEnabled(true);  // Make gear available even if the preference itself is disabled.
+    }
+
+    @Override
+    public void onClick(View v) {
+        if (v.getId() == R.id.settings_button) {
+            if (mOnGearClickListener != null) {
+                mOnGearClickListener.onGearClick(this);
+            }
+        }
+    }
+
+    public interface OnGearClickListener {
+        void onGearClick(GearPreference p);
+    }
+}