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Toggle visibility of graphic in GraphicsLayer

KiaPierce

Is there a way to toggle the visibility of a graphic in a GraphicsLayer?

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deleted-user-ATjHIWsdQYmT

Thanks Andrew. However, there are a few cases in our app where we would like to toggle the visibility of an individual graphic within a GraphicsLayer and not the visiblity of the entire GraphicsLayer. Is there a way to do this?

What you could do is loop through all of the graphics in your graphics layer and when you find the one you want to toggle (based on a specific attribute for instance) you could change it's symbology to transparent. Then to toggle it back on, iterate through your graphics in your Graphics Layer again, and change it's symbology back.

for each gr as graphic in trycast(map.layers("MyGraphicsLayer"),graphicslayer)     if gr.Attributes("NAME") = "TargetGraphic" Then         if checkbox.isChecked = true then            gr.symbol = CType(LayoutRoot.Resources("TransparentSymbol"),ESRI.ArcGIS.Client.Symbols.SimpleFillSymbol)        else           gr.symbol = CType(LayoutRoot.Resources("DefaultSymbol"),ESRI.ArcGIS.Client.Symbols.SimpleFillSymbol)        end if      end if next

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chuckyboy81070

I could be wrong but if a GraphicsLayer is using a Renderer, then an individual graphic's symbol property will be null (or maybe it has changed or even "fixed" if that wasn't ESRI's original intention) so the method you suggest may not always be applicable.

In any case, I found this on another post somewhere and it works great. Basically, setting the geometry to null hides the symbol. This also doesn't require any reflection; it's pure OO inheritance.

Public Class ExtendedGraphic
    Inherits ESRI.ArcGIS.Client.Graphic


    Private _storedGeometry As ESRI.ArcGIS.Client.Geometry.Geometry
    Public Property Visible() As Boolean
        Get
            Return Me.Geometry IsNot Nothing
        End Get
        Set(ByVal value As Boolean)
            If value <> Visible Then
                If value Then
                    If _storedGeometry IsNot Nothing Then Me.Geometry = _storedGeometry
                Else
                    If Me.Geometry IsNot Nothing Then _storedGeometry = Me.Geometry
                    Me.Geometry = Nothing
                End If
            End If
        End Set
    End Property
End Class

SomeGISGuy

@Maxim: Note that changing internal properties through reflection can cause a lot of problems - You're really pulling the rug out under the SDK. Also not that these internals might not be available in future updates.

MaximMikhisor

Type typeInQuestion = typeof(Graphic);

PropertyInfo field = typeInQuestion.GetProperty("Visibility", BindingFlags.NonPublic | BindingFlags.Instance);

field.SetValue(graphic, Visibility.Collapsed);

KiaPierce

Awesome. Thanks Andrew

deleted-user-ATjHIWsdQYmT

Thanks Andrew. However, there are a few cases in our app where we would like to toggle the visibility of an individual graphic within a GraphicsLayer and not the visiblity of the entire GraphicsLayer. Is there a way to do this?

for each gr as graphic in trycast(map.layers("MyGraphicsLayer"),graphicslayer)     if gr.Attributes("NAME") = "TargetGraphic" Then         if checkbox.isChecked = true then            gr.symbol = CType(LayoutRoot.Resources("TransparentSymbol"),ESRI.ArcGIS.Client.Symbols.SimpleFillSymbol)        else           gr.symbol = CType(LayoutRoot.Resources("DefaultSymbol"),ESRI.ArcGIS.Client.Symbols.SimpleFillSymbol)        end if      end if next

KiaPierce

Thanks Andrew. However, there are a few cases in our app where we would like to toggle the visibility of an individual graphic within a GraphicsLayer and not the visiblity of the entire GraphicsLayer. Is there a way to do this?

deleted-user-ATjHIWsdQYmT

GraphicsLayer has a visible property. You could bind the visibility to a checkbox or whatever control you want.
http://help.arcgis.com/en/webapi/silverlight/apiref/ESRI.ArcGIS.Client~ESRI.ArcGIS.Client.GraphicsLayer_members.html

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