WPF

Pete O'Hanlon wrote:

Strictly speaking, in this case he doesn't because of the sequence of events he's using to hook things up. At the point he assigns Name, the class isn't bound to the DataContext so there's nothing for the PropertyChangedEventHandler to raise the notification to.

 

<Grid Name="GrdParams" >
<TextBlock Grid.Column="0" Grid.Row="0" Text="Frequency"  VerticalAlignment="Center" />
<Slider Grid.Column="1" Grid.Row="0" Minimum="0" Maximum="0.25" SmallChange="0.001" Value="{Binding Mode=TwoWay, Path=Frequency}" ValueChanged="FreqSlider_ValueChanged" />
<TextBlock Name="TxtFreq" Grid.Column="2" Grid.Row="0" />
</Grid>

private void FreqSlider_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e)
{
    if (this.TxtFreq != null)
    {
        this.TxtFreq.Text = (sender as Slider).Value.ToString("###0.####");
    }
}

Paul Selormey wrote:

How can I render this on a canvas of the main thread after the background thread is completed?

Mark Salsbery
Microsoft MVP - Visual C++

<DataTemplate x:Key="Column3">
    <Border BorderThickness="0,0,1,0" BorderBrush="Gray" Margin="-6,0,-6,0">
        <TextBlock Margin="2,1,1,1" Text="{Binding Path=stand_name}"></TextBlock>
    </Border>
</DataTemplate>
<DataTemplate x:Key="Column3_Alternative">
    <Border BorderThickness="0,0,0,0" BorderBrush="Gray" Margin="-6,0,-6,0">
        <TextBlock Margin="2,1,1,1" Text="{Binding Path=stand_name}"></TextBlock>
    </Border>
</DataTemplate>

DataTemplate dt = lstvTCKeyValue.FindResource("Column3_Alternative") as DataTemplate;
lstvTCKeyValue.ItemTemplate = dt;

<DataTemplate x:Key="Column3_ShowStandColumn">
    <Border BorderThickness="0,0,1,0" BorderBrush="Gray" Margin="-6,0,-6,0">
        <TextBlock Margin="2,1,1,1" Text="{Binding Path=stand_name}"></TextBlock>
    </Border>
</DataTemplate>
<DataTemplate x:Key="Column3_HideStandColumn">
    <Border BorderThickness="0,0,0,0" BorderBrush="Gray" Margin="-6,0,-6,0">
        <TextBlock Margin="2,1,1,1" Text="{Binding Path=stand_name}"></TextBlock>
    </Border>
</DataTemplate>

if (selectedStand.stand_name != "Все")
{
  ...
  DataTemplate dt = lstvTCKeyValue.FindResource("Column3_HideStandColumn") as DataTemplate;
  gv.Columns[2].CellTemplate = dt;
  ...
}
else
{
  ...
  DataTemplate dt = lstvTCKeyValue.FindResource("Column3_ShowStandColumn") as DataTemplate;
  gv.Columns[2].CellTemplate = dt;
  ...
}

<ControlTemplate x:Key="OnTemplate">
 <Grid ToolTip="{Binding Tag, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type CheckBox}}}">
  <Rectangle HorizontalAlignment="Left" Margin="0" VerticalAlignment="Center" Width="80" Height="20" RadiusX="3" RadiusY="3">
   <Rectangle.Fill>
    <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
     <GradientStop Color="#FF6183DC" Offset="0"/>
     <GradientStop Color="#FFC6CDE0" Offset="1"/>
    </LinearGradientBrush>
   </Rectangle.Fill>
  </Rectangle>
  <TextBlock HorizontalAlignment="Left" VerticalAlignment="Center" Text="ON" TextWrapping="Wrap" Margin="8,0,0,0" FontSize="16" FontWeight="Bold" Foreground="#FFFEFCFC"/>
  <Rectangle RadiusX="3" RadiusY="3" HorizontalAlignment="Left" Margin="40,0,0,0" VerticalAlignment="Center" Width="40" Height="20">
   <Rectangle.Fill>
    <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
     <GradientStop Color="#FFB5B1B1" Offset="0.004"/>
     <GradientStop Color="White" Offset="1"/>
    </LinearGradientBrush>
   </Rectangle.Fill>
  </Rectangle>
 </Grid>
</ControlTemplate>
<ControlTemplate x:Key="OffTemplate">
 <Grid ToolTip="{Binding Tag, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type CheckBox}}}">
  <Rectangle HorizontalAlignment="Left" Margin="0" VerticalAlignment="Center" Width="80" Height="20" RadiusX="3" RadiusY="3">
   <Rectangle.Fill>
    <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
     <GradientStop Color="#FFE0E7F8" Offset="0"/>
     <GradientStop Color="#FFF2F4FA" Offset="1"/>
    </LinearGradientBrush>
   </Rectangle.Fill>
  </Rectangle>
  <TextBlock HorizontalAlignment="Left" VerticalAlignment="Center" Text="OFF" TextWrapping="Wrap" Margin="44,0,0,0" FontSize="16" FontWeight="Bold" Foreground="#FFB3ABAB"/>
  <Rectangle RadiusX="3" RadiusY="3" HorizontalAlignment="Left" Margin="1,0,0,0" VerticalAlignment="Center" Width="40" Height="20">
   <Rectangle.Fill>
    <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
     <GradientStop Color="#FFB5B1B1" Offset="0.004"/>
     <GradientStop Color="White" Offset="1"/>
    </LinearGradientBrush>
   </Rectangle.Fill>
  </Rectangle>
 </Grid>
</ControlTemplate>

<DataTemplate x:Key="toggleTemplate">
 <Control x:Name="toggleControl" Template="{StaticResource OnTemplate}" />
 <DataTemplate.Triggers>
  <DataTrigger Binding="{Binding IsChecked, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type CheckBox}}}" Value="False">
   <Setter Property="Template" TargetName="toggleControl" Value="{StaticResource OffTemplate}" />
  </DataTrigger>
 </DataTemplate.Triggers>
</DataTemplate>

<Style TargetType="ToggleButton">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="ToggleButton">
                <Image MouseDown="Image_MouseDown" Source="{StaticResource CheckedImage}" Height="16" />
            </ControlTemplate>
        </Setter.Value>
    </Setter>
    <Style.Triggers>
        <DataTrigger Binding="{Binding Path=IsChecked, RelativeSource={RelativeSource Mode=TemplatedParent}}" Value="True">
            <Setter Property="Opacity" Value="1" />
        </DataTrigger>
        <DataTrigger Binding="{Binding Path=IsMoueseOver, RelativeSource={RelativeSource Mode=TemplatedParent}}" Value="True">
            <Setter Property="Opacity" Value="0.7" />
        </DataTrigger>
    </Style.Triggers>
</Style>

private void Image_MouseDown(object sender, MouseButtonEventArgs e)
{
    var img = (Image)sender;
    var toggle = (ToggleButton)img.TemplatedParent;
    toggle.IsChecked = true;
}

<ControlTemplate.Triggers>
    <Trigger Property="IsChecked" Value="True">
        <Setter Property="Opacity" Value="1" />
    </Trigger>
</ControlTemplate.Triggers>