34 lines
1.8 KiB
VB.net
34 lines
1.8 KiB
VB.net
Public Class MyScrollViewer
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Inherits ScrollViewer
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Public Property DeltaMuity As Double = 1
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Private RealOffset As Double
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Private Sub MyScrollViewer_PreviewMouseWheel(sender As Object, e As MouseWheelEventArgs) Handles Me.PreviewMouseWheel
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If e.Delta = 0 OrElse ActualHeight = 0 OrElse ScrollableHeight = 0 Then Exit Sub
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Dim SourceType = e.Source.GetType
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If Content.TemplatedParent Is Nothing AndAlso
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((GetType(ComboBox).IsAssignableFrom(SourceType) AndAlso CType(e.Source, ComboBox).IsDropDownOpen) OrElse
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(GetType(TextBox).IsAssignableFrom(SourceType) AndAlso CType(e.Source, TextBox).AcceptsReturn) OrElse
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GetType(ComboBoxItem).IsAssignableFrom(SourceType)) Then
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'如果当前是在对有滚动条的下拉框或文本框执行，则不接管操作
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Exit Sub
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End If
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PerformVerticalOffsetDelta(-e.Delta)
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e.Handled = True
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End Sub
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Public Sub PerformVerticalOffsetDelta(Delta As Double)
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AniStart(AaDouble(Sub(AnimDelta As Double)
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RealOffset = MathRange(RealOffset + AnimDelta, 0, ExtentHeight - ActualHeight)
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ScrollToVerticalOffset(RealOffset)
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End Sub, Delta * DeltaMuity, 300,, New AniEaseOutFluent(6)))
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End Sub
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Private Sub MyScrollViewer_ScrollChanged(sender As Object, e As ScrollChangedEventArgs) Handles Me.ScrollChanged
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RealOffset = VerticalOffset
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If FrmMain IsNot Nothing AndAlso (e.VerticalChange OrElse e.ViewportHeightChange) Then FrmMain.BtnExtraBack.ShowRefresh()
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End Sub
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Private Sub MyScrollViewer_IsVisibleChanged(sender As Object, e As DependencyPropertyChangedEventArgs) Handles Me.IsVisibleChanged
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FrmMain.BtnExtraBack.ShowRefresh()
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End Sub
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End Class
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