Android Open Source - Android-Photo-Zoom Scroller Proxy

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Back to project page Android-Photo-Zoom.

License

The source code is released under:

Apache License

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Java Source Code

package uk.co.senab.photoview;
/*www  .j av  a 2  s  .  c o  m*/
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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