Public Class MyPageLeft
    Inherits Grid
    Private Uuid As Integer = GetUuid()

    '执行逐个进入动画的控件
    Public Property AnimatedControl As FrameworkElement
        Get
            Return GetValue(AnimatedControlProperty)
        End Get
        Set(value As FrameworkElement)
            SetValue(AnimatedControlProperty, value)
        End Set
    End Property
    Public Shared ReadOnly AnimatedControlProperty As DependencyProperty = DependencyProperty.Register("AnimatedControl", GetType(FrameworkElement), GetType(MyPageLeft), New PropertyMetadata(Nothing))

    Public Sub TriggerShowAnimation()
        If AnimatedControl Is Nothing Then
            '缩放动画
            If TypeOf RenderTransform IsNot ScaleTransform Then
                RenderTransform = New ScaleTransform(0.96, 0.96)
                RenderTransformOrigin = New Point(0.5, 0.5)
            End If
            Opacity = 0
            AniStart({
                AaScaleTransform(Me, 1 - CType(RenderTransform, ScaleTransform).ScaleX, 400,, New AniEaseOutBack(2)),
                AaOpacity(Me, 1, 100)
            }, "PageLeft PageChange " & Uuid)
        Else
            '逐个进入动画
            Dim AniList As New List(Of AniData)
            Dim Id As Integer = 0, Delay As Integer = 0
            Dim Controls = GetAllAnimControls()
            For Each Element As FrameworkElement In Controls
                Element.Opacity = 0
                Element.RenderTransform = New TranslateTransform(-25, 0)
                AniList.Add(AaOpacity(Element, If(TypeOf Element Is TextBlock, 0.6, 1), 200, Delay, New AniEaseOutFluent(AniEasePower.Weak)))
                AniList.Add(AaTranslateX(Element, 5, 200, Delay, New AniEaseOutFluent))
                AniList.Add(AaTranslateX(Element, 20, 300, Delay, New AniEaseOutBack(AniEasePower.Weak)))
                If TypeOf Element Is MyListItem Then
                    AniList.Add(AaCode(Sub()
                                           CType(Element, MyListItem).IsMouseOverAnimationEnabled = True
                                           CType(Element, MyListItem).RefreshColor(Me, New EventArgs)
                                       End Sub, Delay + 280))
                End If
                Delay += Math.Max(8, 20 - Id) * 2.5
                Id += 1
            Next
            AniStart(AniList, "PageLeft PageChange " & Uuid)
        End If
    End Sub
    Public Sub TriggerHideAnimation()
        If AnimatedControl Is Nothing Then
            '缩放动画
            If TypeOf RenderTransform IsNot ScaleTransform Then
                RenderTransform = New ScaleTransform(1, 1)
                RenderTransformOrigin = New Point(0.5, 0.5)
            End If
            AniStart({
                AaScaleTransform(Me, 0.95 - CType(RenderTransform, ScaleTransform).ScaleX, 130,, New AniEaseInFluent(AniEasePower.Weak)),
                AaOpacity(Me, -Opacity, 100, 30)
            }, "PageLeft PageChange " & Uuid)
        Else
            '逐个退出动画
            Dim AniList As New List(Of AniData)
            Dim Id As Integer = 0
            Dim Controls = GetAllAnimControls()
            For Each Element As FrameworkElement In Controls
                AniList.Add(AaOpacity(Element, -Element.Opacity, 60, 80 / Controls.Count * Id))
                AniList.Add(AaTranslateX(Element, -6, 60, 80 / Controls.Count * Id))
                Id += 1
            Next
            AniStart(AniList, "PageLeft PageChange " & Uuid)
        End If
    End Sub

    '遍历获取所有需要生成动画的控件
    Private Function GetAllAnimControls() As List(Of FrameworkElement)
        Dim AllControls As New List(Of FrameworkElement)
        GetAllAnimControls(AnimatedControl, AllControls)
        Return AllControls
    End Function
    Private Sub GetAllAnimControls(Element As FrameworkElement, ByRef AllControls As List(Of FrameworkElement))
        If Element.Visibility = Visibility.Collapsed Then Exit Sub
        If TypeOf Element Is MyTextButton Then
            AllControls.Add(Element)
        ElseIf TypeOf Element Is MyListItem Then
            CType(Element, MyListItem).IsMouseOverAnimationEnabled = False
            AllControls.Add(Element)
        ElseIf TypeOf Element Is ContentControl Then
            GetAllAnimControls(CType(Element, ContentControl).Content, AllControls)
        ElseIf TypeOf Element Is Panel Then
            For Each Element2 As FrameworkElement In CType(Element, Panel).Children
                GetAllAnimControls(Element2, AllControls)
            Next
        Else
            AllControls.Add(Element)
        End If
    End Sub

End Class