AutoReverse Property

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AutoReverse Property
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MsoTriState

MsoTriState can be one of these MsoTriState constants.
msoCTrue Doesn't apply to this property.
msoFalse Default. The effect does not play forward and then reverse. 
msoTriStateMixed Doesn't apply to this property.
msoTriStateToggle Doesn't apply to this property.
msoTrue The effect plays forward and then reverse.

expression.AutoReverse

expression   Required. An expression that returns one of the objects in the Applies To list.

Example

The following example adds a shape and an animation effect to it; then sets the animation to reverse direction after finishing forward movement.

  Sub SetEffectTiming()

    Dim effDiamond As Effect
    Dim shpRectangle As Shape

    'Adds rectangle and applies diamond effect
    Set shpRectangle = ActivePresentation.Slides(1).Shapes.AddShape _
        (Type:=msoShapeRectangle, Left:=100, _
        Top:=100, Width:=50, Height:=50)
    Set effDiamond = ActivePresentation.Slides(1).TimeLine _
        .MainSequence.AddEffect(Shape:=shpRectangle, _
         effectId:=msoAnimEffectPathDiamond)

    'Sets the duration of and reverses the effect
    With effDiamond.Timing
        .Duration = 5 ' Length of effect.
        .AutoReverse = msoTrue
    End With

End Sub