操作需求場景：Listbox 高150? item 高150 listbox有幾十個item ，希望鼠標滾輪滾動一次listbox 能滾動到下一個item，

代碼實現：

<Grid x:Name="gd"><Grid.RowDefinitions><RowDefinition Height="158" /><RowDefinition /></Grid.RowDefinitions><Grid Grid.Row="0" Name="firstrowgrid"><ListBox ScrollViewer.PanningRatio="1" PreviewMouseWheel="waterfalllistbox_PreviewMouseWheel" ScrollViewer.ScrollChanged="waterfalllistbox_ScrollChanged" HorizontalAlignment="Stretch" ScrollViewer.CanContentScroll="False" SelectedIndex="{Binding Selectindex,Mode=TwoWay}" ScrollViewer.IsDeferredScrollingEnabled="False" SelectionChanged="waterfalllistbox_SelectionChanged" ScrollViewer.VerticalScrollBarVisibility="Visible" VirtualizingStackPanel.VirtualizationMode="Standard" VirtualizingStackPanel.IsVirtualizing="True" ItemsSource="{Binding WaterFallPoints2}" x:Name="waterfalllistbox"><ListBox.ItemTemplate><DataTemplate><Grid Height="150"><element:PtrRenderCompatible MouseDown="PtrRenderCompatible_MouseDown" Width="{Binding Width}" Height="150" PointItemsSource="{Binding DataPoints}" Brushes="{Binding BrushInfo}"/><TextBlock Text="{Binding StartTime}" Foreground="Blue" HorizontalAlignment="Left" VerticalAlignment="Top" FontSize="12"></TextBlock></Grid></DataTemplate></ListBox.ItemTemplate><ListBox.ItemsPanel><ItemsPanelTemplate><VirtualizingStackPanel Orientation="Vertical"></VirtualizingStackPanel></ItemsPanelTemplate></ListBox.ItemsPanel> </ListBox><Line x:Name="rline" MouseLeftButtonDown="rline_MouseLeftButtonDown" Visibility="Collapsed"></Line><Border Background="#ED9121" HorizontalAlignment="Right" VerticalAlignment="Top"><StackPanel Width="60" Height="50"><TextBlock TextAlignment="Center" Foreground="White" Text="選擇導聯:" Margin="0,2,0,2"></TextBlock><ComboBox ItemsSource="{Binding LeadList}" Mvc.Event="SelectionChanged" Mvc.Action="{Binding SelectLeadAction}" SelectedItem="{Binding WaterFallSelectedLead,Mode=TwoWay}"></ComboBox></StackPanel></Border></Grid>

　　ui界面代碼如上，重點是重寫?waterfalllistbox_PreviewMouseWheel 鼠標滾輪事件

private void waterfalllistbox_PreviewMouseWheel(object sender, MouseWheelEventArgs e){ e.Handled = true;ScrollViewer obj = VisualHelper.FindChildren<ScrollViewer>(waterfalllistbox).First();Debug.WriteLine("ScrollableHeight:" + obj.ScrollableHeight);Debug.WriteLine("VerticalOffset:" + obj.VerticalOffset);Debug.WriteLine("ContentVerticalOffset:" + obj.ContentVerticalOffset);Debug.WriteLine("e.Delta:" + e.Delta);if (e.Delta < 0){obj.PageDown();//向下滾動}else{obj.PageUp();//} }

　　注意：item 的高度是150，由于listboxitem 有默認的外邊距和內邊距，所以listbox 所在的行的高度為158

這樣的話 就能在豎向滑動的時候，可以一次滑動一個。

擴展：橫向滑動的時候??

ScrollViewer.PageLeft(), PageRight()
Listbox 鼠標滾動的時候默認調用的是 ScrollViewer.LineDown（）各個方向的line 方法；
在鍵盤按住上下箭頭的時候默認調用pagedown 等各個方法。

(●'?'●) 打賞個包子也很贊奧

? ?

轉載于:https://www.cnblogs.com/gisbeginner/p/10005864.html

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