Android翻页效果，电子书(21)

        this.mPageTurner = pageTurnerViewP1; 
    } 
  
    void setClipPath(Path clipPath) { 
        this.mClipPath = clipPath; 
    } 
  
    public void setCallback(Callback callback)  { 
        this.mCallback = callback; 
    } 
  
    void drawBackPage(Canvas canvas) { 
       if (this.mCallback != null) 
           this.mCallback.onDrawBackPage(canvas); 
    } 
  
    void drawBackground(Canvas canvas) { 
        if (this.mCallback != null) 
            this.mCallback.onDrawBackground(canvas); 
    } 
  
    public void startPageTurn() { 
        if (this.mPageTurner != null) 
            this.mPageTurner.startPageTurn(0); 
    } 
  
    void onPageTurnFinished(Canvas canvas) { 
        this.mCallback.onPageTurnFinished(canvas); 
        this.mClipPath = null; 
    } 
  
    protected void dispatchDraw(Canvas canvas) { 
        if (this.mClipPath != null) { 
            canvas.save(); 
            canvas.clipPath(this.mClipPath, Region.Op.INTERSECT); 
        } 
        super.dispatchDraw(canvas); 
        if (this.mClipPath != null) 
            canvas.restore(); 
    } 
  
    public void setCorner(int corner) { 
        this.mCorner = corner; 
    } 
  
    public int getCorner() { 
        return this.mCorner; 
    } 
  
    public void setBackPage(Drawable backPage) { 
        this.mBackPage = backPage;