WPF ListBox WrapPanel剪辑长组
我已经创建了一个列表框来显示分组中的项目,当这些组不再适合列表框面板的高度时,它们会从右向左包装。因此,组在列表框中的显示类似于此,其中每个组的高度是任意的(例如,组1的高度是组2的两倍): 下面的XAML工作正常,因为它执行换行,并允许在项目从列表框的右侧运行时显示水平滚动条WPF ListBox WrapPanel剪辑长组,wpf,listbox,scroll,grouping,wrappanel,Wpf,Listbox,Scroll,Grouping,Wrappanel,我已经创建了一个列表框来显示分组中的项目,当这些组不再适合列表框面板的高度时,它们会从右向左包装。因此,组在列表框中的显示类似于此,其中每个组的高度是任意的(例如,组1的高度是组2的两倍): 下面的XAML工作正常,因为它执行换行,并允许在项目从列表框的右侧运行时显示水平滚动条 <ListBox> <ListBox.ItemsPanel> <ItemsPanelTemplate> <StackPanel Orientatio
<ListBox>
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel Orientation="Vertical"/>
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
<ListBox.GroupStyle>
<ItemsPanelTemplate>
<WrapPanel Orientation="Vertical"
Height="{Binding Path=ActualHeight,
RelativeSource={RelativeSource
FindAncestor,
AncestorLevel=1,
AncestorType={x:Type ScrollContentPresenter}}}"/>
</ItemsPanelTemplate>
</ListBox.GroupStyle>
</ListBox>
当一组项目的长度超过包装袋的高度时,就会出现问题。不允许垂直滚动条显示以查看“截止”项目组,而是简单地剪裁该组中的项目。我假设这是WrapPanel中高度绑定的副作用-滚动条认为它不必启用
是否有任何方法可以启用滚动条,或者有其他方法可以解决我没有看到的问题?我认为您是正确的,它与绑定有关。移除绑定时会发生什么?使用绑定时,您是否尝试填充列表框的整个高度?如果是这样,请考虑绑定到MyHealm,或者尝试使用<代码>垂直对齐< /代码>属性。 < P>谢谢您的回答,戴维。 当绑定被移除时,不会发生包裹。WrapPanel将每个组放入一个垂直列中 绑定的目的是强制WrapPanel实际进行包装。如果未设置绑定,WrapPanel将假定高度是无限的,并且从不缠绕
绑定到
MinHeight
会导致一个空列表框。我可以看出VerticalAlignment
属性似乎是一个解决方案,但是对齐本身阻止了任何包装的发生。当绑定和对齐一起使用时,对齐对问题没有影响。通过将WrapPanel上的Height属性设置为ScrollContentPresenter的高度,它将永远不会垂直滚动。但是,如果删除该绑定,它将永远不会换行,因为在布局过程中,它的布局高度是无限的
我建议您创建自己的panel类以获得所需的行为。有一个单独的依赖属性,可以将所需高度绑定到该属性,以便可以使用该属性计算测量和排列步骤中的目标高度。如果任何一个子项的高度高于所需的高度,请使用该个子项的高度作为计算包裹的目标高度
下面是执行此操作的示例面板:
public class SmartWrapPanel : WrapPanel
{
/// <summary>
/// Identifies the DesiredHeight dependency property
/// </summary>
public static readonly DependencyProperty DesiredHeightProperty = DependencyProperty.Register(
"DesiredHeight",
typeof(double),
typeof(SmartWrapPanel),
new FrameworkPropertyMetadata(Double.NaN,
FrameworkPropertyMetadataOptions.AffectsArrange |
FrameworkPropertyMetadataOptions.AffectsMeasure));
/// <summary>
/// Gets or sets the height to attempt to be. If any child is taller than this, will use the child's height.
/// </summary>
public double DesiredHeight
{
get { return (double)GetValue(DesiredHeightProperty); }
set { SetValue(DesiredHeightProperty, value); }
}
protected override Size MeasureOverride(Size constraint)
{
Size ret = base.MeasureOverride(constraint);
double h = ret.Height;
if (!Double.IsNaN(DesiredHeight))
{
h = DesiredHeight;
foreach (UIElement child in Children)
{
if (child.DesiredSize.Height > h)
h = child.DesiredSize.Height;
}
}
return new Size(ret.Width, h);
}
protected override System.Windows.Size ArrangeOverride(Size finalSize)
{
double h = finalSize.Height;
if (!Double.IsNaN(DesiredHeight))
{
h = DesiredHeight;
foreach (UIElement child in Children)
{
if (child.DesiredSize.Height > h)
h = child.DesiredSize.Height;
}
}
return base.ArrangeOverride(new Size(finalSize.Width, h));
}
}
公共类SmartWrapPanel:WrapPanel
{
///
///标识所需的高度依赖项属性
///
公共静态只读DependencyProperty DesiredHeightProperty=DependencyProperty.Register(
“理想高度”,
类型(双),
类型(SmartWrapPanel),
新的FrameworkPropertyMetadata(Double.NaN,
FrameworkPropertyMetadataOptions.AffectsRange|
FrameworkPropertyMetadataOptions.AffectsMeasure));
///
///获取或设置要尝试达到的高度。如果任何子级高于此高度,将使用该子级的高度。
///
公众双期望高度
{
获取{return(double)GetValue(DesiredHeightProperty);}
set{SetValue(DesiredHeightProperty,value);}
}
受保护的覆盖尺寸测量覆盖(尺寸约束)
{
尺寸ret=基准测量超越(约束);
双h=返回高度;
如果(!Double.IsNaN(所需高度))
{
h=所需高度;
foreach(UIElement子元素中的子元素)
{
如果(child.DesiredSize.Height>h)
h=child.DesiredSize.Height;
}
}
返回新尺寸(返回宽度,h);
}
受保护的覆盖System.Windows.Size ArrangeOverride(大小最终化)
{
双h=最终确定高度;
如果(!Double.IsNaN(所需高度))
{
h=所需高度;
foreach(UIElement子元素中的子元素)
{
如果(child.DesiredSize.Height>h)
h=child.DesiredSize.Height;
}
}
返回base.ArrangeOverride(新大小(finalSize.Width,h));
}
}
这是一个稍加修改的代码,它允许水平和垂直滚动,这都归功于之前发布它的Abe Heidebrecht。唯一的变化是MeasureOverride的返回值需要是base.MeasureOverride(新大小(ret.width,h))
//原始代码:Abe Heidebrecht
公共类SmartWrapPanel:WrapPanel
{
///
///标识所需的高度依赖项属性
///
公共静态只读DependencyProperty DesiredHeightProperty=DependencyProperty.Register(
“理想高度”,
类型(双),
类型(SmartWrapPanel),
新的FrameworkPropertyMetadata(Double.NaN,
FrameworkPropertyMetadataOptions.AffectsRange|
FrameworkPropertyMetadataOptions.AffectsMeasure));
///
///获取或设置要尝试达到的高度。如果任何子级高于此高度,将使用该子级的高度。
///
公众双期望高度
{
获取{return(double)GetValue(DesiredHeightProperty);}
set{SetValue(DesiredHeightProperty,value);}
}
受保护的覆盖尺寸测量覆盖(尺寸约束)
{
尺寸ret=基准测量超越(约束);
双h=返回高度;
如果(!Double.IsNaN(所需高度))
{
h=所需高度;
foreach(UIElement子元素中的子元素)
{
如果(child.DesiredSize.Height>h)
h=child.DesiredSize.Height;
}
}
返回基准测量值(新尺寸(相对宽度,h));
}
受保护的覆盖System.Windows.Size ArrangeOverride(大小最终化)
{
双h=最终确定高度;
如果(!Double.IsNaN(Desi
public class SmartWrapPanel : WrapPanel
{
/// <summary>
/// Identifies the DesiredHeight dependency property
/// </summary>
public static readonly DependencyProperty DesiredHeightProperty = DependencyProperty.Register(
"DesiredHeight",
typeof(double),
typeof(SmartWrapPanel),
new FrameworkPropertyMetadata(Double.NaN,
FrameworkPropertyMetadataOptions.AffectsArrange |
FrameworkPropertyMetadataOptions.AffectsMeasure));
/// <summary>
/// Gets or sets the height to attempt to be. If any child is taller than this, will use the child's height.
/// </summary>
public double DesiredHeight
{
get { return (double)GetValue(DesiredHeightProperty); }
set { SetValue(DesiredHeightProperty, value); }
}
protected override Size MeasureOverride(Size constraint)
{
Size ret = base.MeasureOverride(constraint);
double h = ret.Height;
if (!Double.IsNaN(DesiredHeight))
{
h = DesiredHeight;
foreach (UIElement child in Children)
{
if (child.DesiredSize.Height > h)
h = child.DesiredSize.Height;
}
}
return new Size(ret.Width, h);
}
protected override System.Windows.Size ArrangeOverride(Size finalSize)
{
double h = finalSize.Height;
if (!Double.IsNaN(DesiredHeight))
{
h = DesiredHeight;
foreach (UIElement child in Children)
{
if (child.DesiredSize.Height > h)
h = child.DesiredSize.Height;
}
}
return base.ArrangeOverride(new Size(finalSize.Width, h));
}
}
// Original code : Abe Heidebrecht
public class SmartWrapPanel : WrapPanel
{
/// <summary>
/// Identifies the DesiredHeight dependency property
/// </summary>
public static readonly DependencyProperty DesiredHeightProperty = DependencyProperty.Register(
"DesiredHeight",
typeof(double),
typeof(SmartWrapPanel),
new FrameworkPropertyMetadata(Double.NaN,
FrameworkPropertyMetadataOptions.AffectsArrange |
FrameworkPropertyMetadataOptions.AffectsMeasure));
/// <summary>
/// Gets or sets the height to attempt to be. If any child is taller than this, will use the child's height.
/// </summary>
public double DesiredHeight
{
get { return (double)GetValue(DesiredHeightProperty); }
set { SetValue(DesiredHeightProperty, value); }
}
protected override Size MeasureOverride(Size constraint)
{
Size ret = base.MeasureOverride(constraint);
double h = ret.Height;
if (!Double.IsNaN(DesiredHeight))
{
h = DesiredHeight;
foreach (UIElement child in Children)
{
if (child.DesiredSize.Height > h)
h = child.DesiredSize.Height;
}
}
return base.MeasureOverride(new Size(ret.Width, h));
}
protected override System.Windows.Size ArrangeOverride(Size finalSize)
{
double h = finalSize.Height;
if (!Double.IsNaN(DesiredHeight))
{
h = DesiredHeight;
foreach (UIElement child in Children)
{
if (child.DesiredSize.Height > h)
h = child.DesiredSize.Height;
}
}
return base.ArrangeOverride(new Size(finalSize.Width, h));
}
}