private void DrawGridLines()
{
if (Target == null)
{
return;
}
var drawingContext = _gridLinesVisual.RenderOpen();
var itemCount = Target.Items.Count;
if (itemCount == 0)
{
drawingContext.Close();
return;
}
var gridView = Target.View as GridView;
// 获取drawingContext
var startPoint = new Point(0, 0);
var hLineY = 0.0;
// 为了对齐到像素的计算参数，否则就会看到有些线是模糊的
var dpiFactor = this.GetDpiFactor();
var pen = new Pen(this.GridLineBrush, 1 * dpiFactor);
var halfPenWidth = pen.Thickness / 2;
var guidelines = new GuidelineSet();
// 画横线
var lvRender = Target.RenderSize;
var offsetS = Target.TranslatePoint(startPoint, this);
var hLineX1 = offsetS.X + Target.BorderThickness.Left;
var hLineX2 = offsetS.X + _viewWidth;
bool firstLine = true;
for (int i = 0; i < itemCount; i++)
{
var item = Target.ItemContainerGenerator.ContainerFromIndex(i) as ListViewItem;
if (item != null)
{
var renderSize = item.RenderSize;
var offset = item.TranslatePoint(startPoint, this);
if (offset.Y < offsetS.Y)
{
continue;
}
hLineY = offset.Y;
if (firstLine)
{
firstLine = false;
// 加入参考线，对齐到像素
guidelines.GuidelinesY.Add(hLineY + halfPenWidth);
drawingContext.PushGuidelineSet(guidelines);
drawingContext.DrawLine(pen, new Point(hLineX1, hLineY), new Point(hLineX2, hLineY));
drawingContext.Pop();
}
hLineY += renderSize.Height;
if (hLineY > offsetS.Y + Target.ActualHeight)
{
continue;
}
// 加入参考线，对齐到像素
guidelines.GuidelinesY.Add(hLineY + halfPenWidth);
drawingContext.PushGuidelineSet(guidelines);
drawingContext.DrawLine(pen, new Point(hLineX1, hLineY), new Point(hLineX2, hLineY));
drawingContext.Pop();
}
}
// 画竖线
if (null == gridView || null == _headerRowPresenter || !_HorizontalLine)
{
drawingContext.Close();
return;
}
var columns = gridView.Columns;
var headerOffset = _headerRowPresenter.TranslatePoint(startPoint, this);
var headerSize = _headerRowPresenter.RenderSize;
var vLineX = headerOffset.X;
var vLineY1 = headerOffset.Y + headerSize.Height;
if (hLineY > offsetS.Y + Target.ActualHeight)
{
hLineY = offsetS.Y + Target.ActualHeight;
}
firstLine = _leftHorizontalLine;
foreach (var column in columns)
{
var columnWidth = column.GetColumnWidth();
if (firstLine)
{
firstLine = false;
if (offsetS.X >= headerOffset.X + _viewWidth)
{
continue;
}
// 加入参考线，对齐到像素
guidelines.GuidelinesX.Add(offsetS.X + halfPenWidth);
drawingContext.PushGuidelineSet(guidelines);
drawingContext.DrawLine(pen, new Point(offsetS.X, vLineY1), new Point(offsetS.X, hLineY));
drawingContext.Pop();
}
vLineX += columnWidth;
if (vLineX >= headerOffset.X + _viewWidth)
{
continue;
}
// 加入参考线，对齐到像素
guidelines.GuidelinesX.Add(vLineX + halfPenWidth);
drawingContext.PushGuidelineSet(guidelines);
drawingContext.DrawLine(pen, new Point(vLineX, vLineY1), new Point(vLineX, hLineY));
drawingContext.Pop();
}
drawingContext.Close();
}
private void DrawGridLines()
{
if (Target == null)
{
return;
}
if (_headerRowPresenter == null)
{
return;
}
var itemCount = Target.Items.Count;
if (itemCount == 0)
{
return;
}
var gridView = Target.View as GridView;
if (gridView == null)
{
return;
}
// 获取drawingContext
var drawingContext = _gridLinesVisual.RenderOpen();
var startPoint = new Point(0, 0);
// 为了对齐到像素的计算参数，否则就会看到有些线是模糊的
var dpiFactor = this.GetDpiFactor();
var pen = new Pen(this.GridLineBrush, 1 * dpiFactor);
var halfPenWidth = pen.Thickness / 2;
var guidelines = new GuidelineSet();
// 计算表头的偏移量和大小
var headerOffset = _headerRowPresenter.TranslatePoint(startPoint, this);
var headerSize = _headerRowPresenter.RenderSize;
var headerBottomY = headerOffset.Y + headerSize.Height;
// 计算ScrollViewer的可视区域大小
var item0 = _target.ItemContainerGenerator.ContainerFromIndex(0);
if (item0 == null)
{
return;
}
var scrollViewer = item0.GetAncestor <ScrollViewer>();
if (scrollViewer == null)
{
return;
}
var contentElement = scrollViewer.Content as UIElement;
var maxLineX = scrollViewer.ViewportWidth;
var maxLineY = headerBottomY + contentElement.RenderSize.Height;
var vLineY = 0.0;
// 画横线
for (int i = 0; i < itemCount; i++)
{
var item = Target.ItemContainerGenerator.ContainerFromIndex(i) as ListViewItem;
if (item != null)
{
var renderSize = item.RenderSize;
var offset = item.TranslatePoint(startPoint, this);
var hLineX1 = offset.X;
var hLineX2 = offset.X + renderSize.Width;
var hLineY = offset.Y + renderSize.Height;
vLineY = hLineY;
// 小于视图起始位置的不绘制
if (hLineY <= headerBottomY)
{
continue;
}
// 大于视图结束位置之后的不绘制
if (hLineY > maxLineY)
{
break;
}
// 如果大于横向宽度，取横向宽度
if (hLineX2 > maxLineX)
{
hLineX2 = maxLineX;
}
// 加入参考线，对齐到像素
guidelines.GuidelinesY.Add(hLineY + halfPenWidth);
drawingContext.PushGuidelineSet(guidelines);
drawingContext.DrawLine(pen, new Point(hLineX1, hLineY), new Point(hLineX2, hLineY));
drawingContext.Pop();
}
}
// 画竖线
var columns = gridView.Columns;
var vLineX = headerOffset.X;
if (vLineY > maxLineY)
{
vLineY = maxLineY;
}
foreach (var column in columns)
{
var columnWidth = column.GetColumnWidth();
vLineX += columnWidth;
if (vLineX > maxLineX)
{
break;
}
// 加入参考线，对齐到像素
guidelines.GuidelinesX.Add(vLineX + halfPenWidth);
drawingContext.PushGuidelineSet(guidelines);
drawingContext.DrawLine(pen, new Point(vLineX, headerBottomY), new Point(vLineX, vLineY));
drawingContext.Pop();
}
drawingContext.Close();
}