Android Open Source - GuiLib Scroller Proxy

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License

The source code is released under:

Apache License

Java Source Code

/*******************************************************************************
 * Copyright 2011, 2012 Chris Banes.//from  w  w  w.java2 s . c om
 *
 * 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 uk.co.senab.photoview;

import android.annotation.TargetApi;
import android.content.Context;
import android.os.Build.VERSION;
import android.os.Build.VERSION_CODES;
import android.widget.OverScroller;
import android.widget.Scroller;

public abstract class ScrollerProxy {

  public static ScrollerProxy getScroller(Context context) {
    if (VERSION.SDK_INT < VERSION_CODES.GINGERBREAD) {
      return new PreGingerScroller(context);
    } else {
      return new GingerScroller(context);
    }
  }

  public abstract boolean computeScrollOffset();

  public abstract void fling(int startX, int startY, int velocityX, int velocityY, int minX, int maxX, int minY,
      int maxY, int overX, int overY);

  public abstract void forceFinished(boolean finished);

  public abstract int getCurrX();

  public abstract int getCurrY();

  @TargetApi(9)
  private static class GingerScroller extends ScrollerProxy {

    private OverScroller mScroller;

    public GingerScroller(Context context) {
      mScroller = new OverScroller(context);
    }

    @Override
    public boolean computeScrollOffset() {
      return mScroller.computeScrollOffset();
    }

    @Override
    public void fling(int startX, int startY, int velocityX, int velocityY, int minX, int maxX, int minY, int maxY,
        int overX, int overY) {
      mScroller.fling(startX, startY, velocityX, velocityY, minX, maxX, minY, maxY, overX, overY);
    }

    @Override
    public void forceFinished(boolean finished) {
      mScroller.forceFinished(finished);
    }

    @Override
    public int getCurrX() {
      return mScroller.getCurrX();
    }

    @Override
    public int getCurrY() {
      return mScroller.getCurrY();
    }
  }

  private static class PreGingerScroller extends ScrollerProxy {

    private Scroller mScroller;

    public PreGingerScroller(Context context) {
      mScroller = new Scroller(context);
    }

    @Override
    public boolean computeScrollOffset() {
      return mScroller.computeScrollOffset();
    }

    @Override
    public void fling(int startX, int startY, int velocityX, int velocityY, int minX, int maxX, int minY, int maxY,
        int overX, int overY) {
      mScroller.fling(startX, startY, velocityX, velocityY, minX, maxX, minY, maxY);
    }

    @Override
    public void forceFinished(boolean finished) {
      mScroller.forceFinished(finished);
    }

    @Override
    public int getCurrX() {
      return mScroller.getCurrX();
    }

    @Override
    public int getCurrY() {
      return mScroller.getCurrY();
    }
  }
}

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