我有自定义的ScrollViewer定制水平的ListView里面的模板（含混合创建）。 我想用鼠标滚轮时，水平滚动条。 我怎样才能做到这一点？
Answer 1:
如果实现IScrollInfo可以覆盖MouseWheelUp做MouseWheelLeft ，下\右中同样的方式
编辑（更简单）：
添加到您的ScrollViewer PreviewMouseWheel
private void ScrollViewer_PreviewMouseWheel(object sender, MouseWheelEventArgs e)
{
if (e.Delta < 0) // wheel down
{
if (myScrollViewer.HorizontalOffset + e.Delta > 0)
{
myScrollViewer.ScrollToHorizontalOffset(myScrollViewer.HorizontalOffset + e.Delta);
}
else
{
myScrollViewer.ScrollToLeftEnd();
}
}
else //wheel up
{
if (myScrollViewer.ExtentWidth > myScrollViewer.HorizontalOffset + e.Delta)
{
myScrollViewer.ScrollToHorizontalOffset(myScrollViewer.HorizontalOffset + e.Delta);
}
else
{
myScrollViewer.ScrollToRightEnd();
}
}
}
XAML：
<ScrollViewer x:Name="myScrollViewer" HorizontalScrollBarVisibility="Visible" Mouse.PreviewMouseWheel="ScrollViewer_PreviewMouseWheel">
Answer 2:
这应该与做Behavior更大的可重用性。 另外，从ZSH逻辑是多余的，可以简化。 这里是我的代码：
/// <summary>
/// Allows an <see cref="ItemsControl"/> to scroll horizontally by listening to the
/// <see cref="PreviewMouseWheel"/> event of its internal <see cref="ScrollViewer"/>.
/// </summary>
public class HorizontalScrollBehavior : Behavior<ItemsControl>
{
/// <summary>
/// A reference to the internal ScrollViewer.
/// </summary>
private ScrollViewer ScrollViewer { get; set; }
/// <summary>
/// By default, scrolling down on the wheel translates to right, and up to left.
/// Set this to true to invert that translation.
/// </summary>
public bool IsInverted { get; set; }
/// <summary>
/// The ScrollViewer is not available in the visual tree until the control is loaded.
/// </summary>
protected override void OnAttached()
{
base.OnAttached();
AssociatedObject.Loaded += OnLoaded;
}
private void OnLoaded(object sender, RoutedEventArgs e)
{
AssociatedObject.Loaded -= OnLoaded;
ScrollViewer = VisualTreeHelpers.FindVisualChild<ScrollViewer>(AssociatedObject);
if (ScrollViewer != null)
{
ScrollViewer.PreviewMouseWheel += OnPreviewMouseWheel;
}
}
protected override void OnDetaching()
{
base.OnDetaching();
if (ScrollViewer != null)
{
ScrollViewer.PreviewMouseWheel -= OnPreviewMouseWheel;
}
}
private void OnPreviewMouseWheel(object sender, MouseWheelEventArgs e)
{
var newOffset = IsInverted ?
ScrollViewer.HorizontalOffset + e.Delta :
ScrollViewer.HorizontalOffset - e.Delta;
ScrollViewer.ScrollToHorizontalOffset(newOffset);
}
}
你需要添加下列引用： System.Windows ， System.Windows.Controls ， System.Windows.Input ，你可能需要获得混合SDK NuGet包，并找到并引用System.Windows.Interactivity在DLL大会扩展部分。
使用此为VisualTreeHelpers ：
public class VisualTreeHelpers
{
/// <summary>
/// Return the first visual child of element by type.
/// </summary>
/// <typeparam name="T">The type of the Child</typeparam>
/// <param name="obj">The parent Element</param>
public static T FindVisualChild<T>(DependencyObject obj) where T : DependencyObject
{
for (int i = 0; i < VisualTreeHelper.GetChildrenCount(obj); i++)
{
DependencyObject child = VisualTreeHelper.GetChild(obj, i);
if (child != null && child is T)
return (T)child;
else
{
T childOfChild = FindVisualChild<T>(child);
if (childOfChild != null)
return childOfChild;
}
}
return null;
}
}
参考： https://codereview.stackexchange.com/questions/44760/is-there-a-better-way-to-get-a-child
请注意，这是不一样的VisualTreeHelper在Windows.System.Media 。
以下是如何在XAML中使用它：
<ListBox>
<i:Interaction.Behaviors>
<behaviors:HorizontalScrollBehavior />
</i:Interaction.Behaviors>
</ListBox>
当i命名空间被声明为xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"和
behaviors被声明为
xmlns:behaviors="clr-namespace:MyNamespace"
其中MyNamespace是包含命名空间HorizontalScrollBehavior类。
Answer 3:
我有点寻找最简单的方式做任何ScrollViewer左右滚动，而不是上下。 因此，这里是最简单其他答案的组合。
<ScrollViewer HorizontalScrollBarVisibility="Visible"
PreviewMouseWheel="ScrollViewer_PreviewMouseWheel">
和：
private void ScrollViewer_PreviewMouseWheel(object sender, MouseWheelEventArgs e)
{
ScrollViewer scrollViewer = (ScrollViewer)sender;
if (e.Delta < 0)
{
scrollViewer.LineRight();
}
else
{
scrollViewer.LineLeft();
}
e.Handled = true;
}
Answer 4:
XAML代码：
<ScrollViewer HorizontalScrollBarVisibility="Visible"
VerticalScrollBarVisibility="Visible"
PreviewMouseWheel="ScrollViewer_PreviewMouseWheel">
</ScrollViewer>
C＃代码
private void ScrollViewer_PreviewMouseWheel(object sender, MouseWheelEventArgs e)
{
var scrollViewer = (ScrollViewer)sender;
if (Keyboard.IsKeyDown(Key.LeftShift) || Keyboard.IsKeyDown(Key.RightShift))
{
scrollViewer.ScrollToHorizontalOffset(scrollViewer.HorizontalOffset - e.Delta);
e.Handled = true;
}
}
文章来源: Activate horizontal scrolling with mouse on ListView
