Get ContentControl Control's Template Children?

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Hi All

We're working on a Silverlight application that uses a generic custom ContentControl. This ContentControl has a Control Template specified in a Generic.xaml.

The inherited ContentControl's Template...

XML

<Style TargetType="local:ExtContentControl">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="local:ExtContentControl">
                    <Border x:Name="content" Background="{TemplateBinding Background}"
                            BorderBrush="{TemplateBinding BorderBrush}"
                            BorderThickness="{TemplateBinding BorderThickness}"
                            Child="{TemplateBinding Content}">
                    </Border>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

The inherited ComboBox's Template...

<controltemplate targettype="local:ExtComboBox"></controltemplate>

...

<Rectangle x:Name="FocusVisualElement" IsHitTestVisible="false" Margin="1" Opacity="0" RadiusY="2" RadiusX="2" Stroke="#FF6DBDD1" StrokeThickness="1"/>

When it is instantiated the ContentControl's content is set to a (generic) control which can be a Textbox, Dropdown, Label or Datepicker.

public class ExtContentControl : ContentControl
    {
        public ExtContentControl()
        {
            this.DefaultStyleKey = typeof(ExtContentControl);

            RenderControl();
        }

        private void RenderControl()
        {
            ExtComboBox extComboBox = new ExtComboBox();
            this.Content = extComboBox;
        }

        public override void OnApplyTemplate()
        {
            base.OnApplyTemplate();

            Border bor = GetTemplateChild("content") as Border;

            ExtComboBox cmbTest = bor.Child as ExtComboBox;

            //Find FocusVisualElement from ExtComboBox Control Template
            //Rectangle rec = cmbTest.FindName("FocusVisualElement") as Rectangle;
            //cmbTest returns null
        }
    }

As you can see in my last comment...

//Find FocusVisualElement from ExtComboBox Control Template
//Rectangle rec = cmbTest.FindName("FocusVisualElement") as Rectangle;
//cmbTest returns null

How can I get hold of FocusVisualElement from inside OnApplyTemplate inside the ContentControl?

Hope this makes sense.

Posted 6-May-11 2:37am

Ewert Bergh

Updated 9-May-11 22:47pm

v4

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Comments

Manfred Rudolf Bihy 6-May-11 8:43am

Edit: Adjusted pre tags.

Sergey Alexandrovich Kryukov 6-May-11 8:45am

Tag it! Platform, language, UI library. Would would want to guess?
--SA

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Ewert Bergh · Accepted Answer · 2012-03-26T21:50:00

An easier way to do this is to import System.Windows.Controls.Primitives and use the VisualTreeHelper Extensions GetVisualDescendants or GetVisualAncestors!

e.g.:

C#

protected override OnApplyTemplate()
{
    base.OnApplyTemplate();
    Border bor = GetVisualDescendants()
    .OfType<border>()
    .FirstOrDefault(x => (x as FrameworkElement).Name == "content");
};

Manish Ranjan Kumar · Accepted Answer · 2011-05-09T23:29:00

Apply below attribute to your ExtComboBox

[TemplatePart(Name = "FocusVisualElement", Type = typeof(Rectangle))]

Get a hold on Rectangle.

MIDL

public override void OnApplyTemplate()
         {
             base.OnApplyTemplate();
             Rect = GetTemplateChild("FocusVisualElement") as Rectangle;
         }

         public Rectangle Rect { get; private set; }

Make sure you call ApplyTemplate()

     public class ExtContentControl : ContentControl
{
    public ExtContentControl()
    {
        this.DefaultStyleKey = typeof(ExtContentControl);
        RenderControl();
    }
    private void RenderControl()
    {
        ExtComboBox extComboBox = new ExtComboBox();
        this.Content = extComboBox;
    }
    public override void OnApplyTemplate()
    {
        base.OnApplyTemplate();
        Border bor = GetTemplateChild("content") as Border;
        ExtComboBox cmbTest = bor.Child as ExtComboBox;
        cmbTest.ApplyTemplate();
        Rectangle rect = cmbTest.Rect;
    }
}

I hope this helps.

Get ContentControl Control's Template Children?

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