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Feb 10th, 2011, 11:53 AM
#1
Thread Starter
Fanatic Member
xaml data binding problem.
Hi all,
Here is my Problem, I have created a Simple TestBed Application with a UserControl and Embedded it in MainWindow.
I have a class which contains default values for the visible cone shape. On the window i also have 3 sliders which between them and a sub create a 24 bit hexadecimal colour reference.
The value of this is placed in a textbox to confirm it is actually changing. However the cone's colour is not updated to reflect this change.
Here is the code
MainWindow Code:
Imports _3d_UI.Numbers
Class MainWindow
Private Sub UpdateColour()
' get the values of the slider and convert into a format that Colour will accept
If SliderG Is Nothing Or SliderB Is Nothing Then Return
Colour = "#" + CInt(SliderR.Value).ToString("X2")
Colour = Colour + CInt(SliderG.Value).ToString("X2")
Colour = Colour + CInt(SliderB.Value).ToString("X2")
'TODO update component
TextBox1.Text = Colour
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) Handles Button1.Click
End Sub
Private Sub SliderR_ValueChanged(ByVal sender As System.Object, ByVal e As System.Windows.RoutedPropertyChangedEventArgs(Of System.Double)) Handles SliderR.ValueChanged
UpdateColour()
End Sub
Private Sub SliderG_ValueChanged(ByVal sender As System.Object, ByVal e As System.Windows.RoutedPropertyChangedEventArgs(Of System.Double)) Handles SliderG.ValueChanged
UpdateColour()
End Sub
Private Sub SliderB_ValueChanged(ByVal sender As System.Object, ByVal e As System.Windows.RoutedPropertyChangedEventArgs(Of System.Double)) Handles SliderB.ValueChanged
UpdateColour()
End Sub
Public Sub New()
' This call is required by the designer.
InitializeComponent()
' Add any initialization after the InitializeComponent() call.
'UpdateColour()
End Sub
Code:
{MainWindow.xaml}
<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:_3d_UI"
x:Name="Window"
Title="3d ui test"
Width="746" Height="419" mc:Ignorable="d" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006">
<Window.Resources></Window.Resources>
<Grid x:Name="LayoutRoot">
<local:Viewer3D Margin="0,0,102,0" />
<Slider Height="255" HorizontalAlignment="Left" Margin="628,113,0,0" Name="SliderR" VerticalAlignment="Top" Width="28" Orientation="Vertical" Maximum="255" Value="255" SmallChange="1" LargeChange="16" />
<Slider Height="255" HorizontalAlignment="Left" Margin="662,113,0,0" Name="SliderG" Orientation="Vertical" VerticalAlignment="Top" Width="28" Maximum="255" Value="128" LargeChange="16" SmallChange="1" />
<Slider Height="255" HorizontalAlignment="Left" Margin="696,113,0,0" Name="SliderB" Orientation="Vertical" VerticalAlignment="Top" Width="28" Maximum="255" Value="0" LargeChange="16" SmallChange="1" />
<Label Content="R" Height="28" HorizontalAlignment="Left" Margin="628,79,0,0" Name="Label1" VerticalAlignment="Top" />
<Label Content="G" Height="28" HorizontalAlignment="Left" Margin="662,79,0,0" Name="Label2" VerticalAlignment="Top" />
<Label Content="B" Height="28" HorizontalAlignment="Left" Margin="696,79,0,0" Name="Label3" VerticalAlignment="Top" />
<Button Content="Button" Height="23" HorizontalAlignment="Left" Margin="628,12,0,0" Name="Button1" VerticalAlignment="Top" Width="75" />
<TextBox Height="23" HorizontalAlignment="Left" Margin="632,53,0,0" Name="TextBox1" VerticalAlignment="Top" Width="81" Text="" />
</Grid>
</Window>
Class Numbers Code:
Public Class Numbers
Shared Property Colour As String = "#0000FF"
Shared Property Positions As String = "0.293893 -0.5 0.404509 0.475528 -0.5 ... ... 0.404509 0 0.5 0 0 0.5 0 "
Shared Property Normals As String = "0.7236065,0.4472139,0.5257313 0.2763934,0.4472138,0.8506507 ... ... 0.5308242,0.4294462,0.7306172 0.858892,0.429446,0.279071 "
Shared Property Indices As String = "0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 "
End Class
(edited for Simplicity)
Code:
{Viewer3d.xaml}
<UserControl x:Class="Viewer3D"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:_3d_UI"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="300">
<Grid>
<Grid.Resources>
<local:Numbers x:Key="Colour" />
<local:Numbers x:Key="Positions" />
<local:Numbers x:Key="Normals" />
<local:Numbers x:Key="Indices" />
</Grid.Resources>
<!-- Place a Label control at the top of the view. -->
<Label
HorizontalAlignment="Center"
TextBlock.TextAlignment="Center"
FontSize="20"
Foreground="Red"
Content="Model: Cone"/>
<!-- Viewport3D is the rendering surface. -->
<Viewport3D DataContext="{Binding Source={StaticResource Indices}}" Name="myViewport" >
<!-- Add a camera. -->
<Viewport3D.Camera>
<PerspectiveCamera
FarPlaneDistance="20"
LookDirection="0,0,1"
UpDirection="0,1,0"
NearPlaneDistance="1"
Position="0,0,-3"
FieldOfView="45" />
</Viewport3D.Camera>
<!-- Add models. -->
<Viewport3D.Children>
<ModelVisual3D>
<ModelVisual3D.Content>
<Model3DGroup >
<Model3DGroup.Children>
<!-- Lights, MeshGeometry3D and DiffuseMaterial objects are added to the ModelVisual3D. -->
<DirectionalLight Color="#FFFFFFFF" Direction="3,-4,5" />
<!-- Define a red cone. -->
<GeometryModel3D>
<GeometryModel3D.Geometry>
<MeshGeometry3D
Positions="{Binding Path=Positions}"
Normals="{Binding Path=Normals}"
TriangleIndices="{Binding Path=Indices}">
</MeshGeometry3D>
</GeometryModel3D.Geometry>
<GeometryModel3D.Material>
<DiffuseMaterial>
<DiffuseMaterial.Brush>
<SolidColorBrush x:Name="MySolidColorBrush"
Color="{Binding Path=Colour}"
Opacity="1.0"/>
</DiffuseMaterial.Brush>
</DiffuseMaterial>
</GeometryModel3D.Material>
</GeometryModel3D>
</Model3DGroup.Children>
</Model3DGroup>
</ModelVisual3D.Content>
</ModelVisual3D>
</Viewport3D.Children>
<Viewport3D.Triggers>
<EventTrigger RoutedEvent="Viewport3D.MouseEnter">
<BeginStoryboard>
<Storyboard>
<ColorAnimation
Storyboard.TargetName="MySolidColorBrush"
Storyboard.TargetProperty="Color"
From="Blue" To="Red" Duration="0:0:1" />
</Storyboard>
</BeginStoryboard>
</EventTrigger>
<EventTrigger RoutedEvent="Viewport3D.MouseLeave">
<BeginStoryboard>
<Storyboard>
<ColorAnimation
Storyboard.TargetName="MySolidColorBrush"
Storyboard.TargetProperty="Color"
From="Red" To="blue" Duration="0:0:1" />
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</Viewport3D.Triggers>
</Viewport3D>
</Grid>
</UserControl>
This to me is not very intuitive and i am probably doing this wrong, any pointers would be helpful...
If debugging is the process of removing bugs, then programming must be the process of putting them in.
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