获取ContentControl控件的模板子级? [英] Get ContentControl Control's Template Children?

问题描述

大家好

我们正在开发一个使用通用自定义ContentControl的Silverlight应用程序.此ContentControl具有在Generic.xaml中指定的控制模板.

继承的ContentControl的模板...

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...

<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>

继承的ComboBox的模板...

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"/>

实例化时，ContentControl的内容将设置为(通用)控件，该控件可以是Textbox，Dropdown，Label或Datepicker.

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
        }
    }

如您在我的最后评论中所见...

//从ExtComboBox控件模板中找到FocusVisualElement
//Rectangle rec = cmbTest.FindName("FocusVisualElement")as Rectangle;
//cmbTest返回null

如何从ContentControl的OnApplyTemplate内部获取FocusVisualElement?

希望这是有道理的.

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.

推荐答案

一个简单的方法是导入System.Windows.Controls.Primitives并使用VisualTreeHelper扩展GetVisualDescendants或GetVisualAncestors！ >
例如:

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

e.g.:

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

将以下属性应用于您的ExtComboBox

Apply below attribute to your ExtComboBox

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

抓住Rectangle.

Get a hold on Rectangle.

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

         public Rectangle Rect { get; private set; }

确保您调用ApplyTemplate()

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;
    }
}

希望对您有所帮助.

I hope this helps.

这篇关于获取ContentControl控件的模板子级?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！