WPF: hiding a tab element in a tab control that is bound to the observed collection

Question

I have a tab control related to the observed display for dynamic tabs as follows:

<TabControl ItemsSource="{Binding AllTabs}" SelectedIndex="{Binding SelectedItem, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}">
        <TabControl.ItemTemplate>
            <DataTemplate>
                   <!--.............. -->
            </DataTemplate>
        </TabControl.ItemTemplate>

        <TabControl.ContentTemplate>
            <DataTemplate DataType="{x:Type vm:TabViewModel}">
                <c:MyTabItem/>
            </DataTemplate>
        </TabControl.ContentTemplate>
    </TabControl>

In this way, the headers and contents of the tab are defined dynamically and assigned as observable changes to the collection. Now I would like to hide some tabs without deleting them in the collection behind - to save data if the tab opens again.

Ideally, each tab tab view has the IsVisible property, which is set to true by default. However, where do I bind such a property to hide the tab element?

Answer 1

vm:TabViewModel, IsVisible Visibility ContentTemplate:

<TabControl.ContentTemplate>
    <DataTemplate DataType="{x:Type vm:TabViewModel}">
        <c:MyTabItem Visibility={Binding Visibility}/>
    </DataTemplate>
</TabControl.ContentTemplate>

, , IsVisible :

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Data;
using System.Windows;

namespace Something.Converters
{
    [ValueConversion(typeof(bool), typeof(Visibility))]
    public class BoolToVisibilityConverter : IValueConverter
    {

        #region IValueConverter Members
        /// <summary>
        /// Converts a value.
        /// </summary>
        /// <param name="value">The value produced by the binding source.</param>
        /// <param name="targetType">The type of the binding target property.</param>
        /// <param name="parameter">The converter parameter to use.</param>
        /// <param name="culture">The culture to use in the converter.</param>
        /// <returns>
        /// A converted value. If the method returns null, the valid null value is used.
        /// </returns>
        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            if (value is bool && targetType == typeof(Visibility))
            {
                bool val = (bool)value;
                if (val)
                    return Visibility.Visible;
                else
                    if (parameter != null && parameter is Visibility )
                        return parameter;
                    else
                        return Visibility.Collapsed;
            }
            throw new ArgumentException("Invalid argument/return type. Expected argument: bool and return type: Visibility");
        }

        /// <summary>
        /// Converts a value.
        /// </summary>
        /// <param name="value">The value that is produced by the binding target.</param>
        /// <param name="targetType">The type to convert to.</param>
        /// <param name="parameter">The converter parameter to use.</param>
        /// <param name="culture">The culture to use in the converter.</param>
        /// <returns>
        /// A converted value. If the method returns null, the valid null value is used.
        /// </returns>
        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            if (value is Visibility && targetType == typeof(bool))
            {
                Visibility val = (Visibility)value;
                if (val == Visibility.Visible)
                    return true;
                else
                    return false;
            }
            throw new ArgumentException("Invalid argument/return type. Expected argument: Visibility and return type: bool");
        }
        #endregion
    }
}

xaml ( , ):

<Window xmlns:converters="clr-namespace:Something.Converters"
.../>

:

<Window.Resources>
    <converters:BoolToVisibilityConverter x:Key="boolToVisibilityConverter"/>
</Window.Resources>

:

<TabControl.ContentTemplate>
    <DataTemplate DataType="{x:Type vm:TabViewModel}">
        <c:MyTabItem Visibility={Binding IsVisible, Converter={StaticResource boolToVisibilityConverter}, ConverterParameter=Visibility.Collapsed}/>
    </DataTemplate>
</TabControl.ContentTemplate>

, :)

: Ow ConverterParameter Visibility.Collapsed to Visibility.Hidden ;)

Answer 2

<TabControl.ItemContainerStyle>
  <Style TargetType="{x:Type TabItem}">
    <Setter Property="Visibility" Value="{Binding IsVisible, Converter={StaticResource boolToVisibilityConverter}"/>
  </Style>
</TabControl.ItemContainerStyle>

System.Windows.Controls.BooleanToVisibilityConverter bool Visibilty.

CollectionView .

Answer 3

CollectionView. , . CollectionView, , , , .

Answer 4

, . TabControl.ContentTemplate , .

<TabControl.ContentTemplate> <DataTemplate DataType="{x:Type vm:TabViewModel}"> <c:MyTabItem Visibility={Binding Visibility}/> </DataTemplate> </TabControl.ContentTemplate>

, .