1/*
2 * Copyright (C) 2011 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package android.support.v4.app;
18
19import android.content.Context;
20import android.os.Parcelable;
21import android.util.SparseArray;
22import android.view.View;
23import android.view.ViewGroup;
24import android.widget.FrameLayout;
25
26/**
27 * Pre-Honeycomb versions of the platform don't have {@link View#setSaveFromParentEnabled(boolean)},
28 * so instead we insert this between the view and its parent.
29 */
30class NoSaveStateFrameLayout extends FrameLayout {
31    static ViewGroup wrap(View child) {
32        NoSaveStateFrameLayout wrapper = new NoSaveStateFrameLayout(child.getContext());
33        ViewGroup.LayoutParams childParams = child.getLayoutParams();
34        if (childParams != null) {
35            wrapper.setLayoutParams(childParams);
36        }
37        NoSaveStateFrameLayout.LayoutParams lp = new NoSaveStateFrameLayout.LayoutParams(
38                ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.FILL_PARENT);
39        child.setLayoutParams(lp);
40        wrapper.addView(child);
41        return wrapper;
42    }
43
44    public NoSaveStateFrameLayout(Context context) {
45        super(context);
46    }
47
48    /**
49     * Override to prevent freezing of any child views.
50     */
51    @Override
52    protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) {
53        dispatchFreezeSelfOnly(container);
54    }
55
56    /**
57     * Override to prevent thawing of any child views.
58     */
59    @Override
60    protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) {
61        dispatchThawSelfOnly(container);
62    }
63}
64