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The Support Package includes static "support libraries" that you can add to your Android application in order to use APIs that are either not available for older platform versions or that offer "utility" APIs that aren't a part of the framework APIs.

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/*
 * 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.widget;

import android.content.Context;
import android.graphics.Canvas;
import android.widget.EdgeEffect;

/**
 * Stub implementation that contains a real EdgeEffect on ICS.
 *
 * This class is an implementation detail for EdgeEffectCompat
 * and should not be used directly.
 */
class EdgeEffectCompatIcs {
    public static Object newEdgeEffect(Context context) {
        return new EdgeEffect(context);
    }

    public static void setSize(Object edgeEffect, int width, int height) {
        ((EdgeEffect) edgeEffect).setSize(width, height);
    }

    public static boolean isFinished(Object edgeEffect) {
        return ((EdgeEffect) edgeEffect).isFinished();
    }

    public static void finish(Object edgeEffect) {
        ((EdgeEffect) edgeEffect).finish();
    }

    public static boolean onPull(Object edgeEffect, float deltaDistance) {
        ((EdgeEffect) edgeEffect).onPull(deltaDistance);
        return true;
    }

    public static boolean onRelease(Object edgeEffect) {
        EdgeEffect eff = (EdgeEffect) edgeEffect;
        eff.onRelease();
        return eff.isFinished();
    }

    public static boolean onAbsorb(Object edgeEffect, int velocity) {
        ((EdgeEffect) edgeEffect).onAbsorb(velocity);
        return true;
    }

    public static boolean draw(Object edgeEffect, Canvas canvas) {
        return ((EdgeEffect) edgeEffect).draw(canvas);
    }
}