Wpf 设置列表框的滚动条位置
我可以通过编程设置WPF列表框滚动条的位置吗?默认情况下,我希望它位于中间。我认为ListBox没有这种功能,但ListView有一种方法,可以将滚动条移动到所需的位置,以确保显示项目Wpf 设置列表框的滚动条位置,wpf,listbox,scrollviewer,Wpf,Listbox,Scrollviewer,我可以通过编程设置WPF列表框滚动条的位置吗?默认情况下,我希望它位于中间。我认为ListBox没有这种功能,但ListView有一种方法,可以将滚动条移动到所需的位置,以确保显示项目 Dim cnt as Integer = myListBox.Items.Count Dim midPoint as Integer = cnt\2 myListBox.ScrollIntoView(myListBox.Items(midPoint)) 或 这取决于您是否希望中间的项目刚刚显示或选中。要移动列表
Dim cnt as Integer = myListBox.Items.Count
Dim midPoint as Integer = cnt\2
myListBox.ScrollIntoView(myListBox.Items(midPoint))
或
这取决于您是否希望中间的项目刚刚显示或选中。要移动列表框中的垂直滚动条,请执行以下操作:
我刚刚更改了Zamboni的一些代码,并添加了位置计算
var border = VisualTreeHelper.GetChild(list, 0) as Decorator;
if (border == null) return;
var scrollViewer = border.Child as ScrollViewer;
if (scrollViewer == null) return;
scrollViewer.ScrollToVerticalOffset((scrollViewer.ScrollableHeight/list.Items.Count)*
(list.Items.IndexOf(list.SelectedItem) + 1));
我有一个名为MusicList的列表视图。MusicList在播放音乐后自动移动到下一个元素。我为玩家创建一个事件处理程序。结束事件如下(la Zamboni):
if(MusicList.HasItems)
{
装饰器边框=VisualTreeHelper.GetChild(MusicList,0)作为装饰器;
如果(边框!=null)
{
ScrollViewer ScrollViewer=border.Child作为ScrollViewer;
如果(scrollViewer!=null)
{
MusicList.ScrollIntoView(MusicList.SelectedItem);
}
}
}
您可以在底部看到下一个元素。这只是将其滚动到视图中。我需要它向右滚动到中心。但是thanksEnsureVisible是一个windows.Forms函数,问题是关于WPF的。就我所知,在WPF中没有可保证的方法。
<Window x:Class="ListBoxScrollPosition.Views.MainView"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Loaded="Window_Loaded"
Title="Main Window" Height="100" Width="200">
<DockPanel>
<Grid>
<ListBox x:Name="myListBox">
<ListBoxItem>Zamboni</ListBoxItem>
<ListBoxItem>Zamboni</ListBoxItem>
<ListBoxItem>Zamboni</ListBoxItem>
<ListBoxItem>Zamboni</ListBoxItem>
<ListBoxItem>Zamboni</ListBoxItem>
<ListBoxItem>Zamboni</ListBoxItem>
<ListBoxItem>Zamboni</ListBoxItem>
<ListBoxItem>Zamboni</ListBoxItem>
<ListBoxItem>Zamboni</ListBoxItem>
<ListBoxItem>Zamboni</ListBoxItem>
<ListBoxItem>Zamboni</ListBoxItem>
<ListBoxItem>Zamboni</ListBoxItem>
</ListBox>
</Grid>
</DockPanel>
</Window>
private void Window_Loaded(object sender, RoutedEventArgs e)
{
// Get the border of the listview (first child of a listview)
Decorator border = VisualTreeHelper.GetChild(myListBox, 0) as Decorator;
if (border != null)
{
// Get scrollviewer
ScrollViewer scrollViewer = border.Child as ScrollViewer;
if (scrollViewer != null)
{
// center the Scroll Viewer...
double center = scrollViewer.ScrollableHeight / 2.0;
scrollViewer.ScrollToVerticalOffset(center);
}
}
}
var border = VisualTreeHelper.GetChild(list, 0) as Decorator;
if (border == null) return;
var scrollViewer = border.Child as ScrollViewer;
if (scrollViewer == null) return;
scrollViewer.ScrollToVerticalOffset((scrollViewer.ScrollableHeight/list.Items.Count)*
(list.Items.IndexOf(list.SelectedItem) + 1));