[英]Scrolling a ScrollViewer to the bottom in WPF when a new line is added to a TextBlock in XAML
我试图将垂直滚动条保持在底部(最新条目),但此刻,滚动条只是停留在同一个地方,所以当内容被添加到字符串中时,滚动条移动到最佳。
我知道我可以在我的代码隐藏中使用ServerScroll.ScrollToEnd()
属性将栏移到末尾。 但是有没有办法自动做到这一点是xaml? (这样我就不必每次添加到字符串时都调用此属性)。
XAML
<ScrollViewer Name="ServerScroll"
VerticalScrollBarVisibility="Auto">
<TextBlock Name="serverConsole"
Margin="5"
Background="White"
TextWrapping="Wrap"/>
</ScrollViewer>
代码隐藏
private void example_Click(object sender, RoutedEventArgs e)
{
ServerConsole += "asdf\r\n"; // binded to TextBlock
ServerScroll.ScrollToEnd();
}
使用 TextBox,对TextBox.TextChanged
做出反应
如果您想在每次更改TextBlock
的Text
属性时滚动到末尾,我建议您切换到TextBox
以便您可以使用System.Windows.Interactivity
连接到其TextChanged
事件:
<Window x:Class="WpfApp1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"
xmlns:ei="clr-namespace:Microsoft.Expression.Interactivity.Core;assembly=Microsoft.Expression.Interactions">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Button Grid.Row="0" Width="50" Height="25" Click="Button_Click"></Button>
<ScrollViewer Grid.Row="1" Name="ServerScroll"
VerticalScrollBarVisibility="Auto">
<TextBox Name="serverConsole"
Margin="5"
Background="White"
TextWrapping="Wrap">
<i:Interaction.Triggers>
<i:EventTrigger EventName="TextChanged">
<ei:CallMethodAction MethodName="ScrollToEnd" TargetObject="{Binding ElementName=ServerScroll}"/>
</i:EventTrigger>
</i:Interaction.Triggers>
</TextBox>
</ScrollViewer>
</Grid>
</Window>
使用 TextBlock,对Button.Click
做出反应
如果您希望每次单击Button
时都滚动到末尾,则可以使用相同的技术连接到其Click
事件:
<Window x:Class="WpfApp1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"
xmlns:ei="clr-namespace:Microsoft.Expression.Interactivity.Core;assembly=Microsoft.Expression.Interactions">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Button Grid.Row="0" Width="50" Height="25" Click="Button_Click">
<i:Interaction.Triggers>
<i:EventTrigger EventName="Click">
<ei:CallMethodAction MethodName="ScrollToEnd" TargetObject="{Binding ElementName=ServerScroll}"/>
</i:EventTrigger>
</i:Interaction.Triggers>
</Button>
<ScrollViewer Grid.Row="1" Name="ServerScroll"
VerticalScrollBarVisibility="Auto">
<TextBlock Name="serverConsole"
Margin="5"
Background="White"
TextWrapping="Wrap">
</TextBlock>
</ScrollViewer>
</Grid>
</Window>
使用 ListView,对CollectionChanged
做出反应
看起来您确实想使用ItemsControl
而不是TextBlock
,因为您正在谈论条目和所有内容。 您也可以切换到ListView
并连接到其CollectionChanged
事件:
<Window x:Class="WpfApp1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"
xmlns:ei="clr-namespace:Microsoft.Expression.Interactivity.Core;assembly=Microsoft.Expression.Interactions">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Button Grid.Row="0" Width="50" Height="25" Click="Button_Click"/>
<ScrollViewer Grid.Row="1" Name="ServerScroll"
VerticalScrollBarVisibility="Auto">
<ListView x:Name="listView" ItemsSource="{Binding MyList}">
<i:Interaction.Triggers>
<i:EventTrigger SourceObject="{Binding MyList}" EventName="CollectionChanged">
<ei:CallMethodAction MethodName="ScrollToEnd" TargetObject="{Binding ElementName=ServerScroll}"/>
</i:EventTrigger>
</i:Interaction.Triggers>
</ListView>
</ScrollViewer>
</Grid>
</Window>
在您看来 model:
public ObservableCollection<string> MyList { get; } = new ObservableCollection<string>();
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