I want to bind a checkbox values ischecked=true or ischecked=false with a textblock text "Activé" or "Désactivé" only on Xaml and without using a code behind is that possible?
Check out datatriggers.
https://learn.microsoft.com/en-us/dotnet/api/system.windows.datatrigger?view=netframework-4.7.2
https://www.wpf-tutorial.com/styles/trigger-datatrigger-event-trigger/
And here is an example that should work for you.
<CheckBox Name="MyCheckBox" Content="IsActive"/>
<TextBlock>
<TextBlock.Style>
<Style TargetType="TextBlock">
<Setter Property="Text" Value="Activé"/>
<Style.Triggers>
<DataTrigger Binding="{Binding ElementName=MyCheckBox, Path=IsChecked}" Value="False">
<Setter Property="Text" Value="Désactivé"/>
</DataTrigger>
</Style.Triggers>
</Style>
</TextBlock.Style>
</TextBlock>
Related
I am trying to set the header of the DataGrid columns according to a value of a property in my view model. I am using this code:
<DataGridTextColumn.Header>
<TextBlock>
<TextBlock.Style>
<Style TargetType="{x:Type TextBlock}">
<Setter Property="Text" Value="My Default Header"/>
<Style.Triggers>
<DataTrigger Binding="{Binding ElementName=ucPrincipal, Path=DataContext.MyPrperty.ID}" Value="3" >
<Setter Property="Text" Value="Header 2"/>
</DataTrigger>
<DataTrigger Binding="{Binding DataContext.MyProperty.ID, RelativeSource={RelativeSource AncestorType={x:Type local:myUcViewType}}}" Value="4" >
<Setter Property="Text" Value="Header 3"/>
</DataTrigger>
</Style.Triggers>
</Style>
</TextBlock.Style>
</TextBlock>
</DataGridTextColumn.Header>
But the header is always set to the default value. The values of ID are set to 3 and 4 correctly.
I am trying to use two different ways to get the value of the ID which is the source property that is used by the DataTrigger to set the header text.
Thanks.
I want to detect when the selected item changes in a ListBox and a TreeView via DataTriggers
so this is my code
<TextBlock>
<TextBlock.Style>
<Style TargetType="TextBlock">
<Style.Triggers>
<DataTrigger Binding="{Binding ElementName=DirTreeView, Path=SelectedItemChanged}" Value="{x:Null}">
<Setter Property="Text" Value="{Binding ElementName=DirTreeView, Path=SelectedItem, Converter={StaticResource contentConverter}}"/>
</DataTrigger>
<DataTrigger Binding="{Binding ElementName=listbox, Path=SelectionChanged}" Value="{x:Null}">
<Setter Property="Text" Value="{Binding ElementName=listbox, Path=SelectedItem, Converter={StaticResource contentConverter}}"/>
</DataTrigger>
</Style.Triggers>
</Style>
</TextBlock.Style>
</TextBlock>
if i comment out the last DataTrigger it works fine, but when I use both nothing works.
Why is that and how do I get this to work using both triggers?
I'm new to WPF and I trying to create xaml logic to show / hide a control based on the value of the AllowMiscTitle on the ViewModel. The xaml consist of two fields a combobox of the standard tiles ("Mr", "Mrs", ..., "Other") when "Other" is selected I want the textbox to display.
I've created the follow xaml:
<DockPanel Validation.Error="Validation_Error" HorizontalAlignment="Stretch">
<ComboBox ItemsSource="{Binding Path=Titles, Mode=OneTime}"
Text="{Binding Path=Title}"/>
<TextBox x:Name="TxtBxTitle" Margin="5,5" Visibility="Visible">
<TextBox.Style>
<Style>
<Style.Triggers>
<DataTrigger Binding="{Binding Path=AllowMiscTitle}" Value="false">
<Setter Property="TextBox.Visibility" Value="Hidden"/>
</DataTrigger>
</Style.Triggers>
</Style>
</TextBox.Style>
</TextBox>
</DockPanel>
That Trigger won't work because you have set Visibility property explicitly in TextBox
Do it like this:
<TextBox x:Name="TxtBxTitle" Margin="5,5">
<TextBox.Style>
<Style>
<Style.Triggers>
<DataTrigger Binding="{Binding Path=AllowMiscTitle}" Value="false">
<Setter Property="TextBox.Visibility" Value="Hidden"/>
</DataTrigger>
</Style.Triggers>
</Style>
</TextBox.Style>
</TextBox>
The reason for this is Dependency property value precedence.
There is a
<BooleanToVisibilityConverter x:Key="BoolToVis"></BooleanToVisibilityConverter>
You can use it as following
<TextBox Visibility="{Binding YourPropertyName, Converter={StaticResource BoolToVis}}"></TextBox>
If I got your question right:-
If your selected value is binded to some property in the ViewModel like:-
private string _GenderType;
public string GenderType
{
get
{
return _GenderType;
}
set
{
_GenderType= value;
RaisePropertyChanged("GenderType");
In xaml:-
<TextBox.Style>
<Style>
<Setter Property="TextBox.Visibility" value="Hidden"/>
<Style TargetType="{x:Type TextBox}">
<Style.Triggers>
<DataTrigger Binding="{Binding Path=GenderType,ElementName=Combo1}" Value="Other">
<Setter Property="Visibility" Value="Visible"/>
</DataTrigger>
</Style.Triggers>
</Style>
</TextBox.Style>
I want to change the CheckBox which is inside of a DataGridColumn into an image when it is checked and another when it is unchecked, How can i do ?
Ps: My DataGridCheckBoxColumn is defined like this:
<DataGridCheckBoxColumn Header="Priority" Binding="{Binding PRIORITY, Converter={StaticResource converter}}"/>
Converter is converting bytes to boolean.
Use the ElementStyle and EditingElementStyle properties to create and set a different Template for the CheckBox which fits that.
e.g.
<DataGridCheckBoxColumn Binding="{Binding IsActive}">
<DataGridCheckBoxColumn.ElementStyle>
<Style TargetType="{x:Type CheckBox}">
<Setter Property="IsEnabled" Value="False" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type CheckBox}">
<Image MaxWidth="32" MaxHeight="32">
<Image.Style>
<Style TargetType="{x:Type Image}">
<Setter Property="Source" Value="Images/Error.ico" />
<Style.Triggers>
<DataTrigger Binding="{Binding IsChecked, RelativeSource={RelativeSource AncestorType=CheckBox}}" Value="True">
<Setter Property="Source" Value="Images/Default.ico" />
</DataTrigger>
</Style.Triggers>
</Style>
</Image.Style>
</Image>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</DataGridCheckBoxColumn.ElementStyle>
</DataGridCheckBoxColumn>
This makes the column display an image based on IsChecked, the URIs are just hardcoded and the CheckBox is disabled because editing in the ElementStyle does not change any properties on the bound object. Its only purpose is to display the approriate image.
(The EditingElementStyle is not set here so if the user clicks the cell again to edit it a normal CheckBox appears which can be checked or unchecked.)
I have a TextBox that needs to have its border change color and then display a message below the text box. This message should be displayed/hidden based on a bool value in the model. What is the best way to achieve this?
There are a ton of different ways of doing this. If you're only going to do this once, the simplest way is to add the TextBlock to the layout and use a style to hide it, e.g.:
<StackPanel>
<TextBox Text="{Binding Text, Mode=TwoWay}">
<TextBox.Style>
<Style TargetType="TextBox">
<Setter Property="BorderBrush" Value="Lightgray"/>
<Style.Triggers>
<DataTrigger Binding="{Binding IsValid}" Value="False">
<Setter Property="BorderBrush" Value="Red"/>
</DataTrigger>
</Style.Triggers>
</Style>
</TextBox.Style>
</TextBox>
<TextBlock Text="This is the message displayed if IsValid is false.">
<TextBlock.Style>
<Style TargetType="TextBlock">
<Setter Property="Visibility" Value="Collapsed"/>
<Style.Triggers>
<DataTrigger Binding="{Binding IsValid}" Value="False">
<Setter Property="Visibility" Value="Visible"/>
</DataTrigger>
</Style.Triggers>
</Style>
</TextBlock.Style>
</TextBlock>
</StackPanel>
If this is something you want to be able to repeat, you'll want to make this into a template or a user control.
Also, note that changing the visibility from collapsed to visible will change the overall layout, which could have all kinds of undesirable effects. Depending on your design, you might make the visibility default to hidden.
You can use a DataTrigger to set the text, visibility, and appearance of the textbox based on the value in the ViewModel. This seems like the simplest solution.
<TextBox>
<TextBox.Style>
<Style TargetType="TextBox">
<Style.Triggers>
<DataTrigger Binding="{Binding Path=TheBoolean}" Value="True">
<Setter Property="Visibility" Value="Visible" />
<Setter Property="Background" Value="Red" />
...
</DataTrigger>
</Style.Triggers>
</Style>
</TextBox.Style>
</TextBox>
Another option is to create an IValueConverter to convert the bool to get the text, visibility, and color.