Bonjour,
Je dois créer des ContentControl de façon dynamique, pouvoir changer leur contenu et changer leur DataTemplate selon le type de donnée (texte ou image).
(Je crée donc par le code un ContentControl, lui attribue - toujours par le code - un style présent dans le XAML. Dans ce style, j'ai une affectation vers un DataTemplate)
Je suis bloqué par un problème de binding! L'objet s'affiche bien mais je n'arrive pas à accéder à sa propriété 'display_text' dans l'exemple ci-joint!
Merci pour votre aide!
<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:WpfApplication1"
Title="MainWindow" Height="350" Width="525" Background="#FF3A3A48">
<Window.Resources>
<local:RelativeToAbsolutePathConverter x:Key="relToAbsPathConverter" />
<DataTemplate x:Key="ccTexte">
<TextBlock Text="{Binding display_text}" HorizontalAlignment="Center" Foreground="Beige"/>
<!--<TextBlock Text="{Binding Path=display_text}" HorizontalAlignment="Center" Foreground="Beige"/>-->
<!--<TextBlock DataContext="{Binding DataContext,RelativeSource={RelativeSource AncestorType={x:Type ContentControl}}}" Text="{Binding Path=display_text}" HorizontalAlignment="Center" Foreground="Beige"/>-->
</DataTemplate>
<DataTemplate x:Key="ccImage">
<Image x:Name="img" Source="{Binding display_image, Converter={StaticResource relToAbsPathConverter}}"/>
</DataTemplate>
<Style x:Name="ccStyle" TargetType="ContentControl">
<Setter Property="ContentTemplate" Value="{StaticResource ccTexte}"/>
<!--<Setter Property="ContentTemplate" Value="{StaticResource ccImage}"/>
<Style.Triggers>
<DataTrigger Binding="{Binding Source={StaticResource display_image}}" Value="{x:Null}">
<Setter Property="ContentTemplate" Value="{StaticResource ccTexte}"/>
</DataTrigger>
</Style.Triggers>-->
</Style>
</Window.Resources>
<Grid Name="mainGrid">
<Button Content="Button" Height="23" HorizontalAlignment="Left" Margin="416,12,0,0" Name="Button1" VerticalAlignment="Top" Width="75" />
</Grid>
</Window>
Imports System.IO
Class MainWindow
Private Sub MainWindow_Loaded(sender As Object, e As System.Windows.RoutedEventArgs) Handles Me.Loaded
mainGrid.Children.Add(designCC(300, 200, "01"))
Dim cc As ContentControl = LogicalTreeHelper.FindLogicalNode(mainGrid, "CC_01")
cc.Content = New person With {.display_image = "01.png", .display_text = "Text 01"}
End Sub
Private Sub Button1_Click(sender As System.Object, e As System.Windows.RoutedEventArgs) Handles Button1.Click
Dim cc As ContentControl = LogicalTreeHelper.FindLogicalNode(mainGrid, "CC_01")
cc.Content = New person With {.display_image = "02.png", .display_text = "Text 02"}
End Sub
Private Function designCC(width As Integer, height As Integer, id As String) As ContentControl
Dim cc As New ContentControl
cc.Width = width
cc.Height = height
cc.Name = "CC_" & id
cc.Style = DirectCast(Me.Resources("ccStyle"), Style)
Return cc
End Function
End Class
Public Class person
Private _display_image As String
Public Property display_image() As String
Get
Return _display_image
End Get
Set(value As String)
_display_image = value
End Set
End Property
Private _display_text As String
Public Property display_text() As String
Get
Return _display_text
End Get
Set(value As String)
_display_text = value
End Set
End Property
End Class
Public Class RelativeToAbsolutePathConverter
Implements IValueConverter
Public Function Convert(ByVal value As Object, ByVal targetType As Type, ByVal parameter As Object, ByVal culture As System.Globalization.CultureInfo) As Object Implements IValueConverter.Convert
Dim relative As [String] = TryCast(value, String)
If relative Is Nothing Or relative = "" Then
Return Nothing
End If
Return System.AppDomain.CurrentDomain.BaseDirectory & "Images\" & relative
End Function
Public Function ConvertBack(ByVal value As Object, ByVal targetType As Type, ByVal parameter As Object, ByVal culture As System.Globalization.CultureInfo) As Object Implements IValueConverter.ConvertBack
Throw New NotImplementedException()
End Function
End Class
