WPF 4.0 Custom panel won't show dynamically added controls in VS 2010 Designer
- by Matt Ruwe
I have a custom panel control that I'm trying to dynamically add controls within. When I run the application the static and dynamically added controls show up perfectly, but the dynamic controls do not appear within the visual studio designer. Only the controls placed declaratively in the XAML appear. I'm currently adding the dynamic control in the CreateUIElementCollection override, but I've also tried this in the constructor without success.
Public Class CustomPanel1
Inherits Panel
Public Sub New()
End Sub
Protected Overrides Function MeasureOverride(ByVal availableSize As System.Windows.Size) As System.Windows.Size
Dim returnValue As New Size(0, 0)
For Each child As UIElement In Children
child.Measure(availableSize)
returnValue.Width = Math.Max(returnValue.Width, child.DesiredSize.Width)
returnValue.Height = Math.Max(returnValue.Height, child.DesiredSize.Height)
Next
returnValue.Width = If(Double.IsPositiveInfinity(availableSize.Width), returnValue.Width, availableSize.Width)
returnValue.Height = If(Double.IsPositiveInfinity(availableSize.Height), returnValue.Height, availableSize.Height)
Return returnValue
End Function
Protected Overrides Function ArrangeOverride(ByVal finalSize As System.Windows.Size) As System.Windows.Size
Dim currentHeight As Integer
For Each child As UIElement In Children
child.Arrange(New Rect(0, currentHeight, child.DesiredSize.Width, child.DesiredSize.Height))
currentHeight += child.DesiredSize.Height
Next
Return finalSize
End Function
Protected Overrides Function CreateUIElementCollection(ByVal logicalParent As System.Windows.FrameworkElement) As System.Windows.Controls.UIElementCollection
Dim returnValue As UIElementCollection = MyBase.CreateUIElementCollection(logicalParent)
returnValue.Add(New TextBlock With {.Text = "Hello, World!"})
Return returnValue
End Function
Protected Overrides Sub OnPropertyChanged(ByVal e As System.Windows.DependencyPropertyChangedEventArgs)
MyBase.OnPropertyChanged(e)
End Sub
End Class
And my usage of this custom panel
<Window x:Class="MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:CustomPanel"
Title="MainWindow" Height="364" Width="434">
<local:CustomPanel1>
<CheckBox />
<RadioButton />
</local:CustomPanel1>
</Window>
