342_scrollData = new ScrollData();

75_scrollData?.LineUp(this); 83_scrollData?.LineDown(this); 91_scrollData?.LineLeft(this); 99_scrollData?.LineRight(this); 107_scrollData?.PageUp(this); 115_scrollData?.PageDown(this); 123_scrollData?.PageLeft(this); 131_scrollData?.PageRight(this); 139_scrollData?.MouseWheelUp(this); 147_scrollData?.MouseWheelDown(this); 155_scrollData?.MouseWheelLeft(this); 163_scrollData?.MouseWheelRight(this); 171_scrollData?.SetHorizontalOffset(this, offset); 179_scrollData?.SetVerticalOffset(this, offset); 187if (_scrollData == null) 193rectangle = _scrollData.MakeVisible(this, visual, rectangle); 206return (_scrollData != null) ? _scrollData.CanVerticallyScroll : false; 210_scrollData?.CanVerticallyScroll = value; 221return (_scrollData != null) ? _scrollData.CanHorizontallyScroll : false; 225_scrollData?.CanHorizontallyScroll = value; 238if (_scrollData != null) 240result = _scrollData.ExtentWidth; 265if (_scrollData != null) 267result = _scrollData.ExtentHeight; 290return (_scrollData != null) ? _scrollData.ViewportWidth : 0; 301return (_scrollData != null) ? _scrollData.ViewportHeight : 0; 312return (_scrollData != null) ? _scrollData.HorizontalOffset : 0; 323return (_scrollData != null) ? _scrollData.VerticalOffset : 0; 334return _scrollData?.ScrollOwner; 339if (_scrollData == null) 344_scrollData.SetScrollOwner(this, value); 450if (_scrollData != null) 1722if (_scrollData == null) 1729if (!DoubleUtil.AreClose(_scrollData.Viewport, arrangeSize)) 1731_scrollData.Viewport = arrangeSize; 1735if (!DoubleUtil.AreClose(_scrollData.Extent, _contentSize)) 1737_scrollData.Extent = _contentSize; 1742Math.Max(0, Math.Min(_scrollData.ExtentWidth - _scrollData.ViewportWidth, _scrollData.HorizontalOffset)), 1743Math.Max(0, Math.Min(_scrollData.ExtentHeight - _scrollData.ViewportHeight, _scrollData.VerticalOffset))); 1745if (!DoubleUtil.AreClose(offset, _scrollData.Offset)) 1747_scrollData.Offset = offset; 1751if (invalidateScrollInfo && _scrollData.ScrollOwner != null) 1753_scrollData.ScrollOwner.InvalidateScrollInfo(); 1807if (_scrollData != null) 1809horizontalOffset -= _scrollData.HorizontalOffset; 1810verticalOffset -= _scrollData.VerticalOffset; 1965if (_scrollData != null) 1967point = new Point(point.X + _scrollData.HorizontalOffset, point.Y + _scrollData.VerticalOffset); 1982if (_scrollData != null) 1984rect.X -= _scrollData.HorizontalOffset; 1985rect.Y -= _scrollData.VerticalOffset; 2965return _scrollData == null ? Rect.Empty : 2966new Rect(_scrollData.HorizontalOffset, _scrollData.VerticalOffset, _scrollData.ViewportWidth, _scrollData.ViewportHeight);