在WPF中使用AddLogicalChild、AddVisualChild添加UIElement
我通过简单地从面板扩展/继承来创建画布的自定义版本。
当我想在其上绘制或渲染某些内容时，我只需创建一个 DrawingVisual，绘制所需的图形并调用 AddLogicalChild(Visual)、AddVisualChild(Visual) 并增加面板视觉效果的计数。
当我添加 DrawingVisual 实例时，这非常有用，但是当我尝试在此处添加 Button 并定义尺寸时（MinHeight, MinWidth），则不显示。
UIElements 是否可能需要不同的处理逻辑才能显示？基本上，如何将 UIElement 添加到将显示并可以操作的扩展 Panel 中？
I created a custom version of canvas by simply extending/inheriting from the Panel.
When I want to draw or render something on it, I simply create a DrawingVisual, draw the desired graphics and call the AddLogicalChild(Visual), AddVisualChild(Visual) and incrementing the count of the Visuals of the Panel.
This works great when I am adding DrawingVisual instances, but when I try to add a Button here and define the dimensions (MinHeight, MinWidth), it is not displayed.
Is it possible that UIElements need a different logic of handling to be displayed? Basically, how can I add a UIElement to that extended Panel that would be displayed and could be manipulated with?
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如果仅使用
UIElements，则首选方法是将这些项添加到Children集合中。但是如果您混合使用
UIElement和Visual，我建议使用方法AddLogicalChild/AddVisualChild而不是Children。但是，这需要更多的工作：AddLogicalChild将项目（Visual以及UIElement）添加为逻辑和可视子项> 和AddVisualChild。GetVisualChild和VisualChildrenCount并返回项目数/传递索引上的项目UIElement.Measure在每个UIElement上，并执行特定于您的面板的所有其他测量内容UIElement.Arrange调用UIElement并执行特定于您的面板的所有其他排列操作请注意，
Measure和Arrange必须在 after UIElement 已添加到Panel中。就是这样。 :)
If working only with
UIElements, the prefered way is to add that items to theChildrencollection.But if you have a mixture of
UIElements andVisuals, I would suggest to use the methodsAddLogicalChild/AddVisualChildinstead ofChildren. However, that requires a little bit more work:Visuals as well asUIElements) as logical and visual children, usingAddLogicalChildandAddVisualChild.GetVisualChildandVisualChildrenCountand return the number of items / the item on the passed indexUIElement.Measureon eachUIElementand do all the other measure stuff that is specific for your panelUIElement.Arrangefor eachUIElementand do all the other arrange stuff that is specific for your panelNote that
MeasureandArrangehave to be called after the UIElement has been added to thePanel.Thats it. :)
该功能已经包含在内。如果您想将
UIElements添加到您的Panel，只需使用.Children.Add()- 就像使用常规一样Canvas、Grid等。然后在您的实现中，覆盖
MeasureOverride和ArrangeOverride以迭代子级并将它们组织在您的 <代码>面板表面。示例如下： http://msdn.microsoft .com/en-us/library/ms754152(v=vs.110).aspx#Panels_custom_panel_elements
That functionality is already included. If you want to add
UIElementsto yourPanel, simply use.Children.Add()- just like you do with the regularCanvas,Gridetc.Then in your implementation, override
MeasureOverrideandArrangeOverrideto iterate through the children and organize them on yourPanelsurface.Example here: http://msdn.microsoft.com/en-us/library/ms754152(v=vs.110).aspx#Panels_custom_panel_elements
对于
UIElement来说，它是要使用的 CollectionChildren：您还应该查看 InternalChildren 集合，建议在
Panel的扩展中使用。For
UIElements, it's the CollectionChildrento use:You should also look at the InternalChildren Collection which is recommanded to use in extensions of
Panels.