调整ElementHost的到托管用户控件XAML的大小 [英] Resize ElementHost to size of the hosted XAML UserControl

问题描述

我想在我的Windows展开面板窗体应用程序。我有一个看看，看看这是否会使用WPF扩展控制成为可能。我创建了一个用户控件的XAML，我已经从扩展，而不是用户控件继承。我对扩展器，用于设置它的大小的触发

I would like an expanding panel in my Windows Forms app. I was having a look to see if this would be possible using the WPF Expander control. I've created a Xaml UserControl where I've inherited from Expander rather than UserControl. I have a trigger on the Expander for setting it's size.

是否有可能改变ElementHost的高度，以反映儿童的尺寸的变化？或将我只是会更好的Windows窗体创建一个扩展面板？

Is it possible to change the height of the ElementHost to reflect the change in the size of the child? Or would I just be better off creating an expanding Panel in Windows Forms?

我使用C＃.NET 3.5。

I'm using C# .Net 3.5.

干杯

推荐答案

是的。你需要重写你最外层的WPF控件的MeasureOverride ，转换WPF规模坐标到设备坐标，并更新 ElementHost.Size

Yes. You need to override MeasureOverride in your outermost WPF control, convert the size from WPF coordinates to device coordinates, and update ElementHost.Size.

既然你已经继承扩展：

1. 重写的MeasureOverride 法


2. 测量计算后，使用 PresentationSource.From（视觉）.CompositionTarget.TransformToDevice.Transform（点）来获取设备坐标


3. 更新 ElementHost.Size 。

1. Override the MeasureOverride method
2. After the measurement is calculated, use PresentationSource.From(visual).CompositionTarget.TransformToDevice.Transform(point) to get the device coordinates
3. Update ElementHost.Size.

您扩展子类的实例将需要一个指针 ElementHost的来做到这一点。

Your Expander subclass instance will need a pointer to ElementHost to do this.

一个更通用的解决方案是创建一个新的类来处理同步。它将继承 FrameworkElement的并 ElementHost的的直接子。

A more general solution would be to create a new class to handle the synchronization. It would subclass FrameworkElement and be the direct child of ElementHost.

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