Custom Marker Symbol (and Custom Cursor)

chuckyboy81070

Hi All, (using v2.4)

I've been using a custom cursor for a long time now as part of the standard features in the apps I write.  It's simply

Partial Public Class CustomMapCursor
    Inherits UserControl


    Public Sub New()
        InitializeComponent()
    End Sub


    Private ReadOnly MapProperty As DependencyProperty = DependencyProperty.Register("Map", GetType(FrameworkElement), GetType(CustomMapCursor), New PropertyMetadata(Nothing, AddressOf OnMapPropertyChanged))
    Public Property Map() As FrameworkElement
        Get
            Return DirectCast(GetValue(MapProperty), FrameworkElement)
        End Get


        Set(ByVal value As FrameworkElement)
            SetValue(MapProperty, value)
        End Set
    End Property


    Private Shared Sub OnMapPropertyChanged(ByVal d As DependencyObject, ByVal e As DependencyPropertyChangedEventArgs)
        Dim target As CustomMapCursor = DirectCast(d, CustomMapCursor)
        If e.OldValue IsNot Nothing Then
            Dim oldMap As FrameworkElement = CType(e.OldValue, FrameworkElement)
            RemoveHandler oldMap.MouseMove, AddressOf target.Map_MouseMove
            RemoveHandler oldMap.MouseLeave, AddressOf target.Map_MouseLeave
            RemoveHandler oldMap.MouseEnter, AddressOf target.Map_MouseEnter
        End If
        If e.NewValue IsNot Nothing Then
            Dim newMap As FrameworkElement = CType(e.NewValue, FrameworkElement)
            AddHandler newMap.MouseMove, AddressOf target.Map_MouseMove
            AddHandler newMap.MouseLeave, AddressOf target.Map_MouseLeave
            AddHandler newMap.MouseEnter, AddressOf target.Map_MouseEnter
        End If
    End Sub


    Private ReadOnly SourceProperty As DependencyProperty = DependencyProperty.Register("Source", GetType(DataTemplate), GetType(CustomMapCursor), New PropertyMetadata(Nothing, AddressOf OnSourceChanged))
    Public Property Source() As DataTemplate
        Get
            Return CType(GetValue(SourceProperty), DataTemplate)
        End Get
        Set(ByVal value As DataTemplate)
            SetValue(SourceProperty, value)
        End Set
    End Property


    Private Overloads Shared Sub OnSourceChanged(ByVal d As DependencyObject, ByVal e As DependencyPropertyChangedEventArgs)
        Dim target As CustomMapCursor = CType(d, CustomMapCursor)
        Dim oldSource As DataTemplate = CType(e.OldValue, DataTemplate)
        Dim newSource As DataTemplate = target.Source
        target.CustomCursor.ContentTemplate = newSource
        target.OnSourceChanged(oldSource, newSource)
    End Sub


    Protected Overridable Overloads Sub OnSourceChanged(ByVal oldSource As DataTemplate, ByVal newSource As DataTemplate)
        RaiseEvent CursorChanged(Me, New System.EventArgs)
    End Sub


    Private Sub MoveTo(ByVal pt As Point)
        If Me.Map.Cursor IsNot Cursors.None Then
            Me.Map.Cursor = Cursors.None
        End If
        CustomCursor.SetValue(Canvas.LeftProperty, pt.X)
        CustomCursor.SetValue(Canvas.TopProperty, pt.Y)
    End Sub


    Public Shared Event CursorChanged As System.EventHandler


    Private Sub Map_MouseMove(ByVal sender As Object, ByVal e As MouseEventArgs)
        MoveTo(e.GetPosition(Map))
    End Sub


    Private Sub Map_MouseLeave(sender As Object, e As MouseEventArgs)
        LayoutRoot.Visibility = Windows.Visibility.Collapsed
    End Sub


    Private Sub Map_MouseEnter(sender As Object, e As MouseEventArgs)
        LayoutRoot.Visibility = Windows.Visibility.Visible
    End Sub




End Class

XAML is:

<UserControl x:Class="[ProjectName].CustomMapCursor"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">


    <Canvas x:Name="LayoutRoot" IsHitTestVisible="False">
        <ContentControl x:Name="CustomCursor"/>
    </Canvas>
</UserControl>

It is put in the app like so:

<local:CustomMapCursor x:Name="MyCursor"  Map="{Binding ElementName=MyMap}" Source="{StaticResource PanCursor}" Grid.Column="1" HorizontalAlignment="Left" VerticalAlignment="Top"/>

(the Map is alone in Grid.Column 1, so the CustomCursor is placed on top of it)

The DataTemplate for the Cursor is

    <DataTemplate x:Key="PanCursor">
        <Image Width="24" Height="24" Source="/[ProjectName];component/CustomMapCursor/Images/PanColor.png">
            <Image.RenderTransform>
                <TranslateTransform X="-6" Y="-6"/>
            </Image.RenderTransform>
        </Image>
    </DataTemplate>

It is a simple hand. 

The problem I'm having now that I have never had before is that the rate of movement slows down greatly as more graphics are added.  The are points, with a MarkerSymbol defined in a ResourceDictionary as (Cont. in next post)

chuckyboy81070

Following up on this, if i use a simple symbol defined as a resource like:

<esri:SimpleMarkerSymbol x:Key="TestSymbol" Color="Red" Size="8"/>

then there is no slowdown. 

Also, in the case of the custom symbol in the post(s) preceding this one, it is defined as the symbol in a SimpleRenderer and that is then applied to the graphicslayer.  In the case of the TestSymbol above, I am not setting a Renderer on the graphicslayer, but instead applying the symbol directly to the graphic.  Of course, that leaves a blank legend image, so that's not ideal.

Also, in further testing, if I set the outer Grid of the custom MarkerSymbol's ControlTemplate to IsHitTestVisible = False, then there is no slowdown.  But of course, this is also results in no maptips.

This may be a Symbol issue and not a CustomCursor issue.  What can I do to make the Custom MarkerSymbol work well with the CustomCursor?

Lance