Resize TabControl when delete a TabItem

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Good afternoon to all!

I have the next trouble in my WPF app.

I have a TabControl and with a Converter, I achieve to resize the width of the Tabitems . This Is working fine.

Now, in my app, I want have a Button to remove some of these TabItems and at the same time resize the rest of the TabItems. Whenever I remove one of the included TabItems, an error is taking place in my converter (Tabcontrol on the code below is null). What am I doing wrong?

My converter is like this:

C#

public class TabSizeConverterVertical : IMultiValueConverter
    {
        public object Convert(object[] values, Type targetType, object parameter,
            System.Globalization.CultureInfo culture)
        {
            TabControl tabControl = values[0] as TabControl;
            double height = tabControl.ActualHeight / tabControl.Items.Count;
            //Subtract 1, otherwise we could overflow to two rows.
            return (height <= 1) ? 0 : (height);
        }

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

and I use this converter in a style defined for TabItem (below)

XML

<Setter Property="Height">
       <Setter.Value>
           <MultiBinding Converter="{StaticResource tabSizeVertical}">
               <Binding RelativeSource="{RelativeSource Mode=FindAncestor,
           AncestorType={x:Type TabControl}}" />
               <Binding RelativeSource="{RelativeSource Mode=FindAncestor,
           AncestorType={x:Type TabControl}}" Path="ActualHeight" />
           </MultiBinding>
       </Setter.Value>
   </Setter>

Thanks for all.

Posted 24-Oct-13 5:41am

torin86

Updated 24-Oct-13 22:28pm

v4

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Pheonyx 24-Oct-13 17:35pm

What error? Have you tried to debug it at all?

torin86 25-Oct-13 2:28am

Sorry. I forgot the error!!
When I click the button, the tabItem is removed but TabControl doesn´t resize again. how can I force to apply the converter after remove TabItem?

My converter is like this:

public class TabSizeConverterVertical : IMultiValueConverter
{
public object Convert(object[] values, Type targetType, object parameter,
System.Globalization.CultureInfo culture)
{
TabControl tabControl = values[0] as TabControl;
double height = tabControl.ActualHeight / tabControl.Items.Count;
//Subtract 1, otherwise we could overflow to two rows.
return (height <= 1) ? 0 : (height);
}

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

Thanks.

Pheonyx 25-Oct-13 2:46am

Thanks for the code, but you still haven't said what error occurs, or on what line.
Also, where in your XAML is the converter used? Could you post the small section of XAML that uses it please. Use the "Improve Question" button to add your code to the question itself as well as the error message you get. When you click Improve Question you should see how I added your code from your comment into your question for you using "<pre></pre>" tags. Do the same with your XAML code.

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An@nd Rajan10 · Answer 1 · 2013-10-24T07:28:00

Solution 1

first you do "clean solution"
then run the project it will successful

enjoy

Posted 24-Oct-13 7:28am

An@nd Rajan10