I would like to be able to programmatically bind some data to the dependency properties on a BitmapEffect. With a FrameworkElement like TextBlock there is a SetBinding method where you can programmatically do these bindings like:
myTextBlock.SetBinding(TextBlock.TextProperty, new Binding("SomeProperty"));
And I know you can do it in straight XAML (as seen below)
<TextBlock Width="Auto" Text="Some Content" x:Name="MyTextBlock" TextWrapping="Wrap" >
<TextBlock.BitmapEffect>
<BitmapEffectGroup>
<OuterGlowBitmapEffect x:Name="MyGlow" GlowColor="White" GlowSize="{Binding Path=MyValue}" />
</BitmapEffectGroup>
</TextBlock.BitmapEffect>
</TextBlock>
But I can't figure out how to accomplish this with C# because BitmapEffect doesn't have a SetBinding method.
I've tried:
myTextBlock.SetBinding(OuterGlowBitmapEffect.GlowSize, new Binding("SomeProperty") { Source = someObject });
But it doesn't work.
You can use BindingOperation.SetBinding:
Binding newBinding = new Binding();
newBinding.ElementName = "SomeObject";
newBinding.Path = new PropertyPath(SomeObjectType.SomeProperty);
BindingOperations.SetBinding(MyGlow, OuterGlowBitmapEffect.GlowSizeProperty, newBinding);
I think that should do what you want.
Related
I have a situation where I need to create View box with one button. The xaml for this is as below: Please observe Width property of viewbox. The Width should be increased/decreased according to a slider bar(moving to right increases it, to left decreases it). As listed below I know how to do it in xaml and it works fine. But my requirement is to be able to create viewbox in code behind and assign it the properties.
<WrapPanel x:Name="_wrpImageButtons" Grid.IsSharedSizeScope="True"
ScrollViewer.CanContentScroll="True" d:LayoutOverrides="Height"
Margin="5">
<Viewbox x:Name="_ScaleButton"
Width="{Binding Value, ElementName=ZoomSlider}" Stretch="Fill">
<CustomButton:_uscVCARSImagesButton x:Name="_btnImage1"/>
</Viewbox>
</WrapPanel>
Thanks.
This should do what you want:
Viewbox x = new Viewbox();
Binding bnd = new Binding("Value") { ElementName = "ZoomSlider"};
BindingOperations.SetBinding(x, Viewbox.WidthProperty, bnd);
// ... Code to insert the Viewbox into the WrapPanel etc.
You can create the binding relatively easily in Code Behind:
var widthBinding = new Binding("Value") { ElementName = "ZoomSlider" };
_ScaleButton.SetBinding(FrameworkElement.WidthProperty, widthBinding);
I'm trying to serialize a custom WPF user control that features a grid with a textblock that is bound to a dependency property named "Frequency". The snippet that defines the textblock is as follows (the definition of the user control is quite lengthy to post it here!):
<TextBlock x:Name="FrequencyText" Grid.Row="1" Grid.Column="1" Grid.ColumnSpan="2"
FontFamily="Arial Rounded MT"
Foreground="White" FontSize="10" FontWeight="DemiBold" Margin="3"
TextBlock.Text="{Binding Frequency, ElementName=FrequencyButtonControlA, Path=Frequency}"
TextAlignment="Center" VerticalAlignment="Center" HorizontalAlignment="Left" />
I'm working on an editor tool that enables the user to arrange some custom controls into a canvas and change their properties and I need to provide the user with the capability to clone an existing element. In order to do this, I'm serializing the control into an XElement and instantiating a new one afterwards. The code to perform the serialization is as follows:
var contentXaml = (commsPanelItem.Content != null) ? XamlWriter.Save(commsPanelItem.Content) : string.Empty;
var serializedItem = new XElement(
"CommsPanelItem",
new XElement("Type", commsPanelItem.GetType().ToString()),
new XElement("Left", Canvas.GetLeft(commsPanelItem.UIElement)),
new XElement("Top", Canvas.GetTop(commsPanelItem.UIElement)),
new XElement("Width", commsPanelItem.Width),
new XElement("Height", commsPanelItem.Height),
new XElement("zIndex", Panel.GetZIndex(commsPanelItem.UIElement)),
new XElement("Content", contentXaml),
commsPanelItem.GetAttributesForSavingPanelInConfigurator() as XElement);
return serializedItem;
The problem I'm having is that, when serializing the textblock, the "Text" field doesn't preserve the binding to the "Frequency" dependency property, it just gets exported with the value assigned by the user ("131.5" in the following example):
TextBlock Text="131.5" FontFamily="Arial Rounded MT" FontWeight="SemiBold" FontSize="10" Foreground="#FFFFFFFF" TextAlignment="Center" Name="FrequencyText" Margin="3,3,3,3" HorizontalAlignment="Left" VerticalAlignment="Center" Grid.Column="1" Grid.Row="1" Grid.ColumnSpan="2"
My question is: is there any way to be able to serialize dependency property's binding instead of the actual value?
Thanks in advance!
Use the "GetBinding" method found on FrameworkElements instead of pulling its value:
BindingExpression bindingExpression = myTextBox.GetBindingExpression(TextBox.TextProperty);
Then you can probably serialize the BindingExpression.
I've generated a CustomControl that includes (among other elements) a TextBox. Binding a value works:
(Code-Snippet from Generic.xaml)
<TextBox Text="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=ParameterValue, Mode=TwoWay }"/>
Now, i wanted to add some ValueConverter to my Binding, so i implemented a ParameterConverter. Using the Converter works also (so far), i can see the value being converted.
<TextBox Text="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=ParameterValue, Mode=TwoWay, Converter={StaticResource ParameterConverter}}"/>
Now as my converters logic got more complex, i wanted to use the parameter Property on my ParameterConverter. But unfortunately, as parameter is no DependencyProperty, i cannot bind anything to it. I've registered some DependencyProperty in my CustomControl, but i wasn't able to bind it to the ConverterParameter in my XAML. The desired ConverterParameter i want to bind to is a Enum called ParameterUnit.
What i expected the result should look like is something like this:
<TextBox Text="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=ParameterValue, Mode=TwoWay, Converter={StaticResource ParameterConverter}, ConverterParameter='{Binding RelativeSource={RelativeSource TemplatedParent}, Path=ParameterUnit}'}"/>
I've got a solution, but looks really nasty and violates the CCD-principles i'd like to follow always as far as possible. I added some code in my ParameterControl-Class:
public ParameterControl()
{
_textBox = (TextBox)Template.FindName("ParameterValueTextBox", this);
this.Loaded += (s, e) => SetupControl();
}
public void SetupControl()
{
var textBinding = new Binding();
textBinding.RelativeSource = RelativeSource.TemplatedParent;
textBinding.Path = new PropertyPath("ParameterValue");
textBinding.Converter = new ParameterToHumanFormatConverter();
textBinding.ConverterParameter = ParameterUnit;
textBinding.Mode = BindingMode.TwoWay;
textBinding.UpdateSourceTrigger = UpdateSourceTrigger.LostFocus;
_textBox.SetBinding(TextBox.TextProperty, textBinding);
}
Isn't there no better, cleaner and easier solution? I just can't believe there is no way to bind a ConverterParameter.
If you need more than one value binding just use a MultiBinding.
I have a situation where I need to create View box with one button. The xaml for this is as below: Please observe Width property of viewbox. The Width should be increased/decreased according to a slider bar(moving to right increases it, to left decreases it). As listed below I know how to do it in xaml and it works fine. But my requirement is to be able to create viewbox in code behind and assign it the properties.
<WrapPanel x:Name="_wrpImageButtons" Grid.IsSharedSizeScope="True"
ScrollViewer.CanContentScroll="True" d:LayoutOverrides="Height"
Margin="5">
<Viewbox x:Name="_ScaleButton"
Width="{Binding Value, ElementName=ZoomSlider}" Stretch="Fill">
<CustomButton:_uscVCARSImagesButton x:Name="_btnImage1"/>
</Viewbox>
</WrapPanel>
Thanks.
This should do what you want:
Viewbox x = new Viewbox();
Binding bnd = new Binding("Value") { ElementName = "ZoomSlider"};
BindingOperations.SetBinding(x, Viewbox.WidthProperty, bnd);
// ... Code to insert the Viewbox into the WrapPanel etc.
You can create the binding relatively easily in Code Behind:
var widthBinding = new Binding("Value") { ElementName = "ZoomSlider" };
_ScaleButton.SetBinding(FrameworkElement.WidthProperty, widthBinding);
I have been playing with bindings in silverlight, and have figured out how to bind in code, but would prefer to keep the binding in the XAML.
This is the code that works in my .cs file:
System.Windows.Data.Binding IDBinding = new System.Windows.Data.Binding("ID");
IDBinding.Source = MyTrans;
IDBinding.Mode = System.Windows.Data.BindingMode.TwoWay;
cbComboBox.SetBinding(ComboBox.SelectedIndexProperty, IDBinding);
this is my XAML line:
<ComboBox x:Name="cbComboBox" Margin="4,20,6,0" Foreground="#FFD41D1D" Height="25" VerticalAlignment="Top">
How do I express the same thing in XAML?
Thanks!
-Ray
Assuming that you set the DataContext of the parent control of the ComboBox (or on the combobox itself) to MyTrans, the following should do it:
<ComboBox x:Name="cbComboBox" SelectedIndex="{Binding ID, Mode=TwoWay}" />