v4/java/android/support/v4/app/NoSaveStateFrameLayout.java

/*
 * Copyright (C) 2011 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 android.support.v4.app;

import android.content.Context;
import android.os.Parcelable;
import android.util.SparseArray;
import android.view.View;
import android.view.ViewGroup;
import android.widget.FrameLayout;

/**
 * Pre-Honeycomb versions of the platform don't have {@link View#setSaveFromParentEnabled(boolean)},
 * so instead we insert this between the view and its parent.
 */
class NoSaveStateFrameLayout extends FrameLayout {
    static ViewGroup wrap(View child) {
        NoSaveStateFrameLayout wrapper = new NoSaveStateFrameLayout(child.getContext());
        ViewGroup.LayoutParams childParams = child.getLayoutParams();
        if (childParams != null) {
            wrapper.setLayoutParams(childParams);
        }
        NoSaveStateFrameLayout.LayoutParams lp = new NoSaveStateFrameLayout.LayoutParams(
                ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.FILL_PARENT);
        child.setLayoutParams(lp);
        wrapper.addView(child);
        return wrapper;
    }
    
    public NoSaveStateFrameLayout(Context context) {
        super(context);
    }
    
    /**
     * Override to prevent freezing of any child views.
     */
    @Override
    protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) {
        dispatchFreezeSelfOnly(container);
    }

    /**
     * Override to prevent thawing of any child views.
     */
    @Override
    protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) {
        dispatchThawSelfOnly(container);
    }
}