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分享WPF LISTVIEW问题求助
在WPF中：
如果listview里的item只有1个，我remove之后网格线还存在；
如果listview里的item有8个，我remove这8个网格线也还在；
如果listview的item有8个，我remove其中少于8个的项，remove的项的网格线不会存在；
也就是如过全部remove就会有网格线残留；
请指导怎么解决这个问题，谢谢！
如果listview里的item只有1个，我remove之后网格线还存在；
如果listview里的item有8个，我remove这8个网格线也还在；
如果listview的item有8个，我remove其中少于8个的项，remove的项的网格线不会存在；
也就是如过全部remove就会有网格线残留；
请指导怎么解决这个问题，谢谢！
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郑州高新区WPF小王子 2015-09-11
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我是在http://www.cnblogs.com/RMay/archive/2010/12/27/1918048.html这里找的代码来显示网格线；
请问你那里有显示网格线的代码吗？如果有可以发我一下吗，谢谢
[/quote]
用DataGrid吧，它不用手动画网格线。
[/quote]
用DataGrid吧，它不用手动画网格线。
xiyanglvbb 2015-09-11
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我是在http://www.cnblogs.com/RMay/archive/2010/12/27/1918048.html这里找的代码来显示网格线；
请问你那里有显示网格线的代码吗？如果有可以发我一下吗，谢谢
郑州高新区WPF小王子 2015-09-11
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DrawGridLines 水平，垂直线 是画上去的。找 写这段代码的人吧
郑州高新区WPF小王子 2015-09-10
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就是listview item的边框[/quote]
上代码吧，
xiyanglvbb 2015-09-10
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就是listview item的边框
郑州高新区WPF小王子 2015-09-10
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网格线？？ 什么网格线
xiyanglvbb 2015-09-10
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<ListViewWithLines:GridLineDecorator GridLineBrush="#FFE1E1E1">
<ListView x:Name="listView1" Margin="0,54.102,0,0" ItemsSource="{Binding}" SelectionChanged="listView1_SelectionChanged" BorderThickness="0.1,1,0.1,0.1" BorderBrush="Gray" FontWeight="Normal" >
<ListView.View>
<GridView>
<GridViewColumn Header="序号" Width="38" DisplayMemberBinding="{Binding index}"/>
<GridViewColumn Header="xxx" Width="130" DisplayMemberBinding="{Binding xxxxxx}"/>
<GridViewColumn Header="xxxx" Width="170" DisplayMemberBinding="{Binding xxxxx}"/>
<GridViewColumn Header="状态" Width="170" DisplayMemberBinding="{Binding state}"/>
<GridViewColumn Header="xxxxx" Width="100" DisplayMemberBinding="{Binding xxxxx}"/>
<GridViewColumn Header="xxxxxxx" Width="90" DisplayMemberBinding="{Binding xxxxxx}" />
</GridView>
</ListView.View>
</ListView>
</ListViewWithLines:GridLineDecorator>
namespace ListViewWithLines
{
[ContentProperty("Target")]
public class GridLineDecorator : FrameworkElement
{
private ListView _target;
private DrawingVisual _gridLinesVisual = new DrawingVisual();
private GridViewHeaderRowPresenter _headerRowPresenter = null;
public GridLineDecorator()
{
this.AddVisualChild(_gridLinesVisual);
this.AddHandler(ScrollViewer.ScrollChangedEvent, new RoutedEventHandler(OnScrollChanged));
}
#region GridLineBrush
/// <summary>
/// GridLineBrush Dependency Property
/// </summary>
public static readonly DependencyProperty GridLineBrushProperty =
DependencyProperty.Register("GridLineBrush", typeof(Brush), typeof(GridLineDecorator),
new FrameworkPropertyMetadata(Brushes.LightGray,
new PropertyChangedCallback(OnGridLineBrushChanged)));
/// <summary>
/// Gets or sets the GridLineBrush property. This dependency property
/// indicates ....
/// </summary>
public Brush GridLineBrush
{
get { return (Brush)GetValue(GridLineBrushProperty); }
set { SetValue(GridLineBrushProperty, value); }
}
/// <summary>
/// Handles changes to the GridLineBrush property.
/// </summary>
private static void OnGridLineBrushChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
((GridLineDecorator)d).OnGridLineBrushChanged(e);
}
/// <summary>
/// Provides derived classes an opportunity to handle changes to the GridLineBrush property.
/// </summary>
protected virtual void OnGridLineBrushChanged(DependencyPropertyChangedEventArgs e)
{
DrawGridLines();
}
#endregion
#region Target
public ListView Target
{
get { return _target; }
set
{
if (_target != value)
{
if (_target != null) Detach();
RemoveVisualChild(_target);
RemoveLogicalChild(_target);
_target = value;
AddVisualChild(_target);
AddLogicalChild(_target);
if (_target != null) Attach();
InvalidateMeasure();
}
}
}
private void GetGridViewHeaderPresenter()
{
if (Target == null)
{
_headerRowPresenter = null;
return;
}
_headerRowPresenter = Target.GetDesendentChild<GridViewHeaderRowPresenter>();
}
#endregion
#region DrawGridLines
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();
}
#endregion
#region Overrides to show Target and grid lines
protected override int VisualChildrenCount
{
get { return Target == null ? 1 : 2; }
}
protected override System.Collections.IEnumerator LogicalChildren
{
get { yield return Target; }
}
protected override Visual GetVisualChild(int index)
{
if (index == 0) return _target;
if (index == 1) return _gridLinesVisual;
throw new IndexOutOfRangeException(string.Format("Index of visual child '{0}' is out of range", index));
}
protected override Size MeasureOverride(Size availableSize)
{
if (Target != null)
{
Target.Measure(availableSize);
return Target.DesiredSize;
}
return base.MeasureOverride(availableSize);
}
protected override Size ArrangeOverride(Size finalSize)
{
if (Target != null)
Target.Arrange(new Rect(new Point(0, 0), finalSize));
return base.ArrangeOverride(finalSize);
}
#endregion
#region Handle Events
private void Attach()
{
_target.Loaded += OnTargetLoaded;
_target.Unloaded += OnTargetUnloaded;
_target.SizeChanged += OnTargetSizeChanged;
}
private void Detach()
{
_target.Loaded -= OnTargetLoaded;
_target.Unloaded -= OnTargetUnloaded;
_target.SizeChanged -= OnTargetSizeChanged;
}
private void OnTargetLoaded(object sender, RoutedEventArgs e)
{
if (_headerRowPresenter == null)
GetGridViewHeaderPresenter();
DrawGridLines();
}
private void OnTargetUnloaded(object sender, RoutedEventArgs e)
{
DrawGridLines();
}
private void OnTargetSizeChanged(object sender, SizeChangedEventArgs e)
{
DrawGridLines();
}
private void OnScrollChanged(object sender, RoutedEventArgs e)
{
DrawGridLines();
}
#endregion
}
}
xiyanglvbb 2015-09-10
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就是listview item的边框[/quote]
上代码吧，[/quote]
就是remove之后 边框没有去掉，
