WPF

VijaySofist wrote:

Also if it is possible thro SilverLight Please send me the source code.

VijaySofist wrote:

But it expects me to give the definition of that function Name in the same code behind window of the XAML.

VijaySofist wrote:

It must be Just like a MustOverride Function.

TJoe wrote:

1. Create a separate class (e.g. ScaleFactor) with a single property (e.g. Value)
2. Implement INotifyPropertyChanged in the ScaleFactor class and fire it when the Value changes.

public class VisualScale : INotifyPropertyChanged
{
    private double scale = 1.0;
    public double ScalingFactor
    {
        get { return scale; }
        set { scale = value; NotifyPropertyChanged("Scale changed"); }
    }

    #region INotifyPropertyChanged Members
    private void NotifyPropertyChanged(String info)
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(info));
        }
    }
    public event PropertyChangedEventHandler PropertyChanged;
    #endregion
}

TJoe wrote:

3. Create an IMultiValueConverter that takes two values: 1st will be the "value" from your underlying data (you don't have to use a TypeConverter, but you probably can), 2nd will be the scale factor. The IMultiValueConverter will then multiply the two values and return that.

public class WidthScaler : IMultiValueConverter
{
    #region IMultiValueConverter Members
    public object Convert(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        if ( targetType != typeof(double) )
        {
            throw new NotSupportedException("Target type of WidthScaler must be double");
        }

        if ( values.Length != 2 || 
             values[0].GetType() != typeof(double) || 
             values[1].GetType() != typeof(double) )
        {
            throw new NotSupportedException("Source values should be a pair of doubles");
        }

        return (double) values[0]*(double) values[1];
    }

    public object[] ConvertBack(object value,
                                Type[] targetTypes,
                                object parameter,
                                System.Globalization.CultureInfo culture)
    {
        throw new NotImplementedException();
    }
    #endregion
}

TJoe wrote:

4. Define an instance of ScaleFactor in the Window's resource section.
5. Define an instance of your converter from #3 in the Window's resource section.

    <Window.Resources>
        <local:Database x:Key="data" x:Name="data"/>
        <local:VisualScale x:Key="scale" x:Name="scale" />
        <local:WidthScaler x:Key="widthScaler" x:Name="widthScaler" />

TJoe wrote:

6. Update the Border's width to be a MultiBinding using your converter with the "value" and scale factor (from #4) as your input values.

        <DataTemplate x:Key="programmeTemplate">
            <Border>
                <Border.Width>
                    <MultiBinding Converter="{StaticResource widthScaler}"
                                  ConverterParameter="">
                        <Binding Path="{Binding Duration}" />
                        <Binding Path="widthScaler"/>
                    </MultiBinding>
                </Border.Width>

<Slider x:Name="scaleSlider" Width="100" Minimum="0.5" Maximum="10.0" Value="{Binding Path=widthScaler}"/>

<Slider x:Name="scaleSlider" Width="100" Minimum="0.5" Maximum="10.0" 
        Value="{Binding ElementName=scale, Path=ScalingFactor}"/>

<Border.Width>
    <MultiBinding Converter="{StaticResource widthScaler}"
                  ConverterParameter="">
        <Binding Path="{Binding Duration}" />
        <Binding ElementName="scale" Path="ScalingFactor"/>
    </MultiBinding>
</Border.Width>

<Binding Path="{Binding Duration}" />

<Binding Path="Duration" />

if ( values.Length != 2 || 
    values[0].GetType() != typeof(double) || 
    values[1].GetType() != typeof(double) )
{
    throw new NotSupportedException("Source values should be a pair of doubles");
}

<Binding ElementName="scale" Path="ScalingFactor"/>

<Binding Source="{StaticResource scale}" Path="ScalingFactor"/>

<Slider x:Name="scaleSlider" Width="100" Minimum="0.5" Maximum="10.0" Value="{Binding Source=scale, Path=ScalingFactor, Mode=TwoWay}"/>

<Binding Source="{StaticResource scale}" Path="ScalingFactor"/>

<Slider x:Name="scaleSlider" Width="100" Minimum="0.5" Maximum="10.0" Value="{Binding Source={StaticResource scale}, Path=ScalingFactor, Mode=TwoWay}"/>