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WPF Custom control reset textbox text to a default value

I need a text box with a button in it,it must display a default value but should still allow the user to type into a text that i need to store in my ViewModel property.
The button should reset the value to the default one.
I got few issues with this implementation:
When the user type into the textbox i would expect the bound property in my viewModel to update accordingly, but seems there is no binding anymore. (Binding is set two way)
(the binding and the DataContext is correct, as on load is displaying the value set from the ViewModel)
Once i type into the box and hit the revert button the text is assign to the property as expected, but the text box still display he same value type by the user.
Each time i move across tabs o click another control, the button responsible for revert the text back, needs to be clicked twice (looks like a focus issue) as once the focus is in the text box all is working normally.
I have created a Generic.xaml were i have defined the control template.
<Style x:Key="{x:Type local:RememberValue}" TargetType="{x:Type local:RememberValue}">
<Setter Property="Background" Value="{StaticResource RemeberValue_Background}" />
<Setter Property="BorderBrush" Value="{StaticResource RemeberValue_Border}" />
<Setter Property="Foreground" Value="{StaticResource RemeberValue_Foreground}" />
<Setter Property="BorderThickness" Value="1" />
<Setter Property="Focusable" Value="True" />
<Setter Property="SnapsToDevicePixels" Value="True" />
<Setter Property="FocusVisualStyle" Value="{x:Null}"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type local:RememberValue}">
<Grid x:Name="LayoutGrid">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<baseControlUi:IconButton
Grid.Column="0"
Height="22"
Grid.ZIndex="1"
Margin="0"
EllipseDiameter="19"
Focusable="True"
Visibility="{Binding ElementName=RememberValueControl, Path=IsDifferentValue, Converter={StaticResource BooleanToVisibilityConverter}}"
ButtonCommand="{TemplateBinding RevertCommand}"
ButtonIcon="{StaticResource RevertIcon}" />
<TextBox
Grid.ZIndex="0"
Foreground="{StaticResource RemeberValue_Foreground}"
Text="{TemplateBinding DisplayText}"
HorizontalAlignment="Stretch"
VerticalAlignment="Center" />
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
This is the usage in the View.
<StackPanel Width="400">
<remebervalue:RememberValue
DisplayText="{Binding DisplayText, UpdateSourceTrigger=PropertyChanged}"
DefaultValue="{Binding DefaultText, UpdateSourceTrigger=PropertyChanged}"
HorizontalAlignment="Left" Width="400" />
</StackPanel>
the code behind of RemeberValue.cs ha DP registered for the DisplayText and the DefaultText
public static readonly DependencyProperty DisplayTextProperty =
DependencyProperty.Register(nameof(DisplayText), typeof(string), typeof(RememberValue), new FrameworkPropertyMetadata(null, FrameworkPropertyMetadataOptions.BindsTwoWayByDefault, OnDisplayText_Changed));
public RememberValue()
{
RevertCommand = new SimpleCommand(Revert);
}
private void Revert()
{
DisplayText = DefaultValue;
}
public string DisplayText
{
get => (string)GetValue(DisplayTextProperty);
set => SetValue(DisplayTextProperty, value);
}
private static void OnDisplayText_Changed(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
RememberValue RememberValue = d as RememberValue;
}

Partial answer
First point: I believe you are mistaken in writing "Binding is set two way", as you are using TemplateBinding, which is always one-way. You should replace it with
Binding DisplayText, RelativeSource={RelativeSource TemplatedParent}, Mode=TwoWay
Second point: fixed by the above
Third point: different issue, needs to be addressed in a different question.

Binding Custom Button Background/ Border to Custom Property

I am fairly new to WPF and the .NET Framework.
I have created a custom button class and have added a dependency property "Colors" which is another class that I created which defines a buttons border/face colors when enabled and disabled. In the style for this button, I am trying to use Relative Source Binding to Bind members of the "Colors" property to different Properties of the button (Border.Background, Border.BorderBrush, etc.).
Here is my button class:
public class FsnButton : Button
{
static FsnButton()
{
DefaultStyleKeyProperty.OverrideMetadata(typeof(FsnButton), new FrameworkPropertyMetadata(typeof(FsnButton)));
}
public FsnButton()
{
Colors = FsnColors.GrayBtnColors;
}
public GuiTypes.ButtonColors Colors
{
get { return GetValue(ColorsProperty) as GuiTypes.ButtonColors; }
set { SetValue(ColorsProperty, value); }
}
public static readonly DependencyProperty ColorsProperty =
DependencyProperty.Register("Colors", typeof(GuiTypes.ButtonColors), typeof(FsnButton), null);
}
And here is the template portion of the style
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="local:FsnButton">
<Border Name="Face" CornerRadius="3"
Background="{ Binding RelativeSource={RelativeSource Self}, Path=Colors.Enabled.Face}"
BorderThickness="1"
BorderBrush="{ Binding RelativeSource={RelativeSource Self}, Path=Colors.Enabled.Border}">
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsPressed" Value="True">
<Setter Property="Background" Value="{ Binding RelativeSource={RelativeSource Self}, Path=Colors.Enabled.Border}"></Setter>
<Setter Property="Button.Effect">
<Setter.Value>
<DropShadowEffect Color="DarkSlateGray" Direction="320" ShadowDepth="0" BlurRadius="5" Opacity="0.5"></DropShadowEffect>
</Setter.Value>
</Setter>
<Setter Property="RenderTransform">
<Setter.Value>
<TranslateTransform X="3" Y="3" />
</Setter.Value>
</Setter>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
This approach is unsuccessful. When I create an instance of my button class, It doesn't get drawn at all. Am I on the right path? Is there a better way to do what I want?

Your binding paths doesn't resolve. You have to use either TemplateBinding or RelativeSoure TemplatedParent, whenever you are inside a ControlTemplate and want to bind to the templated control itself:
<ControlTemplate TargetType="local:FsnButton">
<!-- TemplatedParent binding source -->
<Border Name="Face"
Background="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=Colors.Enabled.Face}"
BorderBrush="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=Colors.Enabled.Border}" />
<!-- TemplateBinding -->
<Border Name="Face"
Background="{TemplateBinding Colors.Enabled.Face}"
BorderBrush="{TemplateBinding Colors.Enabled.Border}" />
</ControlTemplate>

How to change XAML elemen't template from code-behind?

I have next button's style defined in resources:
<Style x:Key="OKBtn" TargetType="{x:Type Button}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Button}">
<Grid>
<Rectangle .../>
<TextBlock x:Name="Text" ..>
<Run Language="en-en" Text="OK"/>
</TextBlock>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
And I want in some specified case from code change Button's text.
I.e. change "OK" (<Run Language="en-en" Text="OK"/>) to "Accept".
How can I do that?
Is it possible to access this TextBlock "Text" and change content exactly for my one button, but not for all OK buttons?
My button:
<Button x:Name="OkButton" Style="{DynamicResource OKBtn}" />

You can borrow some props from template Template, for example Tag property. So the TextBlock text in the ControlTemplate should be like this.
<Run Language="en-en" Text="{Binding RelativeSource={RelativeSource Mode=TemplatedParent}, Path=Tag}"/>
And you can change the button caption by setting it's Tag property.
OkButton.Tag = "Accept";
And for not set all button texts manually you can create some ValueConverter to set TextBlock text in the ControlTemplate to the "Ok" whenever Tag property is empty.

At first, you should declare ContentPresenter to show any object in your Content property of Button control.
<Style x:Key="OkBtn" TargetType="Button">
<Setter Property="ContentTemplate">
<Setter.Value>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<Rectangle/>
<ContentPresenter Content="{Binding Path=Content, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Button}}}"></ContentPresenter>
</StackPanel>
</DataTemplate>
</Setter.Value>
</Setter>
</Style>
Then, it is possible to set another Content by using code behind or binding:
By code behind:
okButton.Content="desirableText";
By binding:
<Button x:Name="OkButton" Style="{DynamicResource OKBtn}" Content="{Binding FooText}" />
private string fooText;
public string FooText
{
get { return fooText; }
set
{
fooText = value;
OnPropertyChanged("FooText");
}
}

Change the Color Displayed in WPF Charting Toolkit Legend

I have the following style which removes data point and randomly generates a line color for my line series plots
<Style x:Key="LineDataPointStyle"
TargetType="ChartingToolkit:LineDataPoint">
<Setter Property="Foreground" Value="DarkGreen"/>
<Setter Property="IsTabStop" Value="False"/>
<Setter Property="Width" Value="NaN"/>
<Setter Property="Height" Value="NaN"/>
<Setter Property="Background"
Value="{Binding RelativeSource={RelativeSource Self},
Converter={StaticResource ColorBrushConverter}}"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ChartingToolkit:LineDataPoint">
<Grid x:Name="Root" Opacity="0"/>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
where the converter is:
public class ColorToBrushConverter : IValueConverter
{
public object Convert(object value, Type targetType,
object parameter, System.Globalization.CultureInfo culture)
{
return new SolidColorBrush(Utils.GenerateRandomColor());
}
public object ConvertBack(object value, Type targetType,
object parameter, System.Globalization.CultureInfo culture)
{
throw new NotImplementedException();
}
}
This generate the line in a random color, but the legend is a different color; either being auto-generated by the library itself or it is also calling my converter through the style template.
How can I get the legend to print the correct color?

Note: is the answer to the question of Killercam, that has been asked here. Answer to this question is particularly suitable for his bounty, so at his request I publish it here.
In this answer, the Button control is used to demonstrate working with templates.
Part I. Binding in ControlTemplate
If you want to use Binding in a ControlTemplate, you should use following construction:
<ControlTemplate TargetType="{x:Type SomeControl}">
<Rectangle Fill="{TemplateBinding Background}" />
Quoted from MSDN:
A TemplateBinding is an optimized form of a Binding for template scenarios, analogous to a Binding constructed with {Binding RelativeSource={RelativeSource TemplatedParent}}.
Notes about using TemplateBinding
TemplateBinding doesn’t work outside a template or outside its VisualTree property, so you can’t even use TemplateBinding inside a template’s trigger. Furthermore, TemplateBinding doesn’t work when applied to a Freezable (for mostly artificial reasons), for example - VisualBrush. In such cases it is possible to use Binding like this:
<FreezableControl Property="{Binding RelativeSource={RelativeSource TemplatedParent},
Path=Background}" />
Also, you can always use an alternative for TemplateBinding:
<Rectangle Fill="{Binding RelativeSource={RelativeSource TemplatedParent},
Path=Background}" />
As another possibility, you can also try the following:
<Rectangle Fill="{Binding Background,
RelativeSource={RelativeSource AncestorType={x:Type SomeControl}},
Path=Background}" />
Part II. Notes about your version
In your case, this may cause a conflict of names in the ControlTemplate, because you already are using Binding background is for Border. Therefore, remove it this Binding for a Border, or use another property, such as Tag or attached dependency property for binding Background color.
Example of using
Instead ChartingToolkit controls, took as a basis Button control, because it's easier to demonstrate the idea of ​​this styles.
Solution 1: using Tag
<Window.Resources>
<Style x:Key="TestButtonStyle" TargetType="{x:Type Button}">
<Setter Property="BorderThickness" Value="0" />
<Setter Property="IsTabStop" Value="False" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Button}">
<!-- Here we are set Tag for Border Background -->
<Border Background="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=Tag}"
BorderThickness="{TemplateBinding BorderThickness}">
<Grid>
<Rectangle Width="24"
Height="24"
Fill="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=Background}"
Stroke="{TemplateBinding BorderBrush}" />
<ContentPresenter Content="{TemplateBinding Content}"
HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
VerticalAlignment="{TemplateBinding VerticalContentAlignment}" />
</Grid>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Window.Resources>
<Grid>
<Button Name="TestButton"
Style="{StaticResource TestButtonStyle}"
Content="Test"
HorizontalContentAlignment="Center"
VerticalContentAlignment="Center"
Tag="Green"
Background="Aquamarine"
Width="100"
Height="100" />
</Grid>
Output
Here for Rectangle, set two colors: default for Rectangle, in Tag for Border. I do not find this a good solution, and here's why:
If a Border and Rectangle need to set different values, such as: Background, BorderThickness, BorderBrush, etc. one Tag is not enough.
With one name property must be clearly its purpose, one name "Tag" us to nothing says.
Of these disadvantages can be concluded that we should find an alternative, as an alternative I use a extender-class with the attached dependency properties.
Extender class ButtonExt.cs
public static class ButtonExt
{
#region RectangleBackground Property
public static readonly DependencyProperty RectangleBackgroundProperty;
public static void SetRectangleBackground(DependencyObject DepObject, Brush value)
{
DepObject.SetValue(RectangleBackgroundProperty, value);
}
public static Brush GetRectangleBackground(DependencyObject DepObject)
{
return (Brush)DepObject.GetValue(RectangleBackgroundProperty);
}
#endregion
#region RectangleBorderBrush Property
public static readonly DependencyProperty RectangleBorderBrushProperty;
public static void SetRectangleBorderBrush(DependencyObject DepObject, Brush value)
{
DepObject.SetValue(RectangleBorderBrushProperty, value);
}
public static Brush GetRectangleBorderBrush(DependencyObject DepObject)
{
return (Brush)DepObject.GetValue(RectangleBorderBrushProperty);
}
#endregion
#region Button Constructor
static ButtonExt()
{
#region RectangleBackground
PropertyMetadata BrushPropertyMetadata = new PropertyMetadata(Brushes.Transparent);
RectangleBackgroundProperty = DependencyProperty.RegisterAttached("RectangleBackground",
typeof(Brush),
typeof(ButtonExt),
BrushPropertyMetadata);
#endregion
#region RectangleBorderBrush
RectangleBorderBrushProperty = DependencyProperty.RegisterAttached("RectangleBorderBrush",
typeof(Brush),
typeof(ButtonExt),
BrushPropertyMetadata);
#endregion
}
#endregion
}
MainWindow.xaml
<Window.Resources>
<Style x:Key="TestButtonExtensionStyle" TargetType="{x:Type Button}">
<Setter Property="Width" Value="80" />
<Setter Property="Height" Value="80" />
<Setter Property="Background" Value="Green" />
<Setter Property="BorderBrush" Value="Pink" />
<Setter Property="BorderThickness" Value="4" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Button}">
<Border Background="{TemplateBinding Background}"
BorderBrush="{TemplateBinding BorderBrush}"
BorderThickness="{TemplateBinding BorderThickness}">
<Grid>
<Rectangle Fill="{TemplateBinding PropertiesExtension:ButtonExt.RectangleBackground}"
Stroke="{TemplateBinding PropertiesExtension:ButtonExt.RectangleBorderBrush}"
Width="30"
Height="30" />
<ContentPresenter Content="{TemplateBinding Content}"
HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
VerticalAlignment="{TemplateBinding VerticalContentAlignment}" />
</Grid>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Window.Resources>
<Grid>
<Button Style="{StaticResource TestButtonExtensionStyle}"
PropertiesExtension:ButtonExt.RectangleBackground="Aquamarine"
PropertiesExtension:ButtonExt.RectangleBorderBrush="Black"
Content="Test" />
</Grid>
Output
Part III. Setting values for dependency properties
When you create and register your attached dependency property, you must declare the Set and Get methods to work with him:
public static void SetRectangleBackground(DependencyObject DepObject, Brush value)
{
DepObject.SetValue(RectangleBackgroundProperty, value);
}
public static Brush GetRectangleBackground(DependencyObject DepObject)
{
return (Brush)DepObject.GetValue(RectangleBackgroundProperty);
}
Then work with them will be as follows:
Set
ButtonExt.SetRectangleBackground(MyButton, Brushes.Red);
Get
Brush MyBrush = ButtonExt.GetRectangleBackground(MyButton);
But in our case, it's not so simple. When I used the attached dependency property problems in updating values ​​were not. But in our case, the property is in the template, and in my case there was no update Button. I tried to set Mode=TwoWay, UpdateSourceTrigger=PropertyChanged, in Binding and in the property declaration, GetBindingExpression().UpdateTarget(), but it was useless.
Note that for the property setting a new value, and notification from the template is not, that the property has been updated. Maybe I'm wrong, and you have will work, or maybe it's made specifically, for example to avoid memory leaks.
In any case, it is better not to update the dependency property directly, and bind to it the property of the Model and in the ViewModel to set the value.
Example:
<Button Style="{StaticResource TestButtonExtensionStyle}"
adp:ButtonExt.RectangleBackground="{Binding Path=Model.RectBackground,
Mode=TwoWay,
UpdateSourceTrigger=PropertyChanged}"
adp:ButtonExt.RectangleBorderBrush="{Binding Path=Model.RectBorderBrush,
Mode=TwoWay,
UpdateSourceTrigger=PropertyChanged}" />
where RectBackground and RectBorderBrush implement the INotifyPropertyChanged interface.
As an alternative in this case, do not use dependency properties and use the DataTemplate for the control. DataTemplate ideal for MVVM, very flexible and dynamic.
For example, work with DataTemplate, you can see my answers:
Make (create) reusable dynamic Views
One ViewModel for UserControl and Window or separate ViewModels

I do something similar, where I generate plots with changing colors, but these colors are randomly selected from a preferred list (I have a black background and some colors just don't work very well on top of black) . I set the color from code behind and I am not sure this is something you can do.
In your case I would try something like this:
//If you declare your style in a resource dictionary, get that resource first
ResourceDictionary resD = (ResourceDictionary)Application.LoadComponent(new Uri("ResourcesPlot\\ResourceDictionaryPlot.xaml", UriKind.Relative));
//The actual style
Style lineDataPointStyle= (Style)resD["LineDataPointStyle"];
//Set the color
lineDataPointStyle.Setters.Add(new Setter(BackgroundProperty, Utils.GenerateRandomColor()));
Hope this works.
Edit:
For the legend I use this (I have an extra checkbox for showing/hiding a certain plot)
<Style x:Key="CustomLegendItemStyle" TargetType="{x:Type chartingToolkit:LegendItem}">
<Setter Property="IsTabStop" Value="False" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="chartingToolkit:LegendItem">
<StackPanel Orientation="Horizontal">
<CheckBox VerticalAlignment="Center" Margin="3" IsChecked="true" Checked="DisplaySeries_Checked" Unchecked="DisplaySeries_Unchecked"/>
<!--<Rectangle VerticalAlignment="Center" Width="8" Height="8" Fill="{DynamicResource MyBackgroundDiode1}" Stroke="{Binding BorderBrush}" StrokeThickness="1" Margin="5,5,5,5" />-->
<chartingToolkit:LegendItem VerticalAlignment="Center" Content="{TemplateBinding Content}" />
</StackPanel>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>

MouseOver trigger doesn`t work after programmatically set Foreground

I'm new to WPF, but searching internet for some days I couldn't figure out my problem.
After I programmatically change Foreground property, IsMouseOver trigger doesn't work. Please be tolerant and thank in advance :)
<Style x:Key="ZizaMenuItem" TargetType="{x:Type Button}">
<Setter Property="SnapsToDevicePixels" Value="True" />
<Setter Property="VerticalContentAlignment" Value="Center"/>
<Setter Property="HorizontalContentAlignment" Value="Center"/>
<Setter Property="Margin" Value="5,0,5,0"/>
<Setter Property="Height" Value="30"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Button}">
<Label FontSize="14" Content="{TemplateBinding Content}" Name="ZizaMenuItemText" />
<ControlTemplate.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter TargetName="ZizaMenuItemText" Property="Foreground" Value="#ff0000"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<StackPanel Height="30" Name="ZizaMenu" Orientation="Horizontal" Margin="0,12,0,0" VerticalAlignment="Top">
<Label Content="ZIZA" FontSize="11" FontWeight="Bold" Foreground="Black" Height="25" Margin="20,0,10,0" />
<Button Name="ZizaMenuInteresting" Click="ZizaMenuItemClicked" Content="ИНТЕРЕСНОЕ" Style="{StaticResource ZizaMenuItem}" />
<Button Name="ZizaMenuBest" Click="ZizaMenuItemClicked" Content="ЛУЧШЕЕ" Style="{StaticResource ZizaMenuItem}" />
<Button Name="ZizaMenuAuto" Click="ZizaMenuItemClicked" Content="АВТО" Style="{StaticResource ZizaMenuItem}" />
</StackPanel>
private void ZizaMenuItemClicked(object sender, RoutedEventArgs e)
{
// get label object from template
Button zizaMenuItem = (Button)sender;
Label zizaMenuItemText = (Label)zizaMenuItem.Template.FindName("ZizaMenuItemText", zizaMenuItem);
// set Foreground color for all buttons in menu
foreach (var item in ZizaMenu.Children)
if (item is Button)
((Label)(item as Button).Template.FindName("ZizaMenuItemText", (item as Button))).Foreground = Brushes.Black;
// set desired color to clicked button label
zizaMenuItemText.Foreground = new SolidColorBrush(Color.FromRgb(102, 206, 245));
}

That is horrible code, do not mess with controls inside control templates, ever. Template.FindName is something only the control that is being templated should call internally to get its parts, and only those, everything else should be considered uncertain.
If you need to change a property template bind it, and then bind or set said property on the instance. In terms of precedence you need to make sure not to create a local value which overrides the triggers (that is what you did). You can use a Style and Setter on the Label to bind the default Foreground.
<Label.Style>
<Style TargetType="Label">
<Setter Property="Foreground" Value="{TemplateBinding Foreground}"/>
</Style>
</Label.Style>
Now you just need to set the Foreground of the Button itself, the Trigger should still internally have precedence over that Setter.

It has to do with dependency property value precedence. Local values have higher precedence than template triggers.
For more information read this: http://msdn.microsoft.com/en-us/library/ms743230.aspx