如何实现AutoScroll HeaderedItemsControl WPF？
如何实现AutoScroll HeaderedItemsControl WPF？
提问于 2021-09-27 11:55:25
我合并了我发现的东西来实现一个自动滚动到端头的项控件。我做不到。我做错了什么？
在资源目录中，ScrollingHeaderedItemsControl的样式为：
<Style TargetType="common:ScrollingHeaderedItemsControl">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type HeaderedItemsControl}">
<Border BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="3" SnapsToDevicePixels="True">
<StackPanel>
<Grid>
<Rectangle Fill="{TemplateBinding Background}"/>
<ContentPresenter ContentSource="Header" Margin="2,0,0,0"/>
</Grid>
<ScrollViewer VerticalScrollBarVisibility="Hidden">
<ItemsPresenter Margin="5,0,0,0"/>
</ScrollViewer>
</StackPanel>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>类ScrollingHeaderedItemsControl的定义如下：
public class ScrollingHeaderedItemsControl : HeaderedItemsControl
{
protected override void OnItemsChanged(NotifyCollectionChangedEventArgs e)
{
if (e.NewItems != null)
{
int newItemCount = e.NewItems.Count;
if (newItemCount > 0)
this.ScrollToEnd();
base.OnItemsChanged(e);
}
}
}ScrollToEnd是专门为ScrollingHeaderedItemsControl编写的静态函数，如：
public static void ScrollToEnd(this ItemsControl control)
{
try
{
Border border = VisualTreeHelper.GetChild((DependencyObject)control, 0) as Border;
StackPanel sp = VisualTreeHelper.GetChild((DependencyObject)border, 0) as StackPanel;
ScrollViewer sv = VisualTreeHelper.GetChild((DependencyObject)sp, 1) as ScrollViewer;
sv.ScrollToEnd();
}
catch(Exception)
{
}
}ScrollingHeaderedItemsControl在UserControl中的用法如下：
<common:ScrollingHeaderedItemsControl x:Name="MessagesHIC" FontSize="32" Header="Error/Warning/Info Messages"
Background="Green"
BorderBrush="AntiqueWhite" ItemsSource="{Binding Messages}"
Margin="10" Grid.Row="1" Grid.Column="0"
ScrollViewer.CanContentScroll="True">
<common:ScrollingHeaderedItemsControl.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding MessageString}" Foreground="{Binding MessageColor}" TextWrapping="Wrap" FontWeight="Light" FontSize="26" />
</DataTemplate>
</common:ScrollingHeaderedItemsControl.ItemTemplate
</common:ScrollingHeaderedItemsControl>回答 1
Stack Overflow用户
回答已采纳
发布于 2021-09-27 12:38:02
模板包含不设置高度约束的堆栈面板，因此滚动查看器从来不需要显示滚动条。将模板更改为以下内容：
<Style TargetType="common:ScrollingHeaderedItemsControl">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type HeaderedItemsControl}">
<Border BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="3" SnapsToDevicePixels="True">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"></RowDefinition>
<RowDefinition></RowDefinition>
</Grid.RowDefinitions>
<Grid>
<Rectangle Fill="{TemplateBinding Background}" />
<ContentPresenter ContentSource="Header" Margin="2,0,0,0" />
</Grid>
<ScrollViewer Grid.Row="1" VerticalScrollBarVisibility="Hidden">
<ItemsPresenter Margin="5,0,0,0" />
</ScrollViewer>
</Grid>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>然后，需要将后面的代码更改为：
try
{
Border border = VisualTreeHelper.GetChild((DependencyObject)control, 0) as Border;
Grid sp = VisualTreeHelper.GetChild((DependencyObject)border, 0) as Grid;
ScrollViewer sv = VisualTreeHelper.GetChild((DependencyObject)sp, 1) as ScrollViewer;
sv.ScrollToEnd();
}
catch (Exception)
{
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/69346143
复制相关文章
相似问题
腾讯云开发者
