您不需要那些。从概念上讲,
TabControl
只是
ObservableCollection<ViewModel>
的图形表示,其中每个视图模型都由一个选项卡项表示,在给定时间只有一个
SelectedItem
:
<Window x:Class="WpfApplication4.Window12"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Window12" Height="300" Width="300">
<Window.Resources>
<BooleanToVisibilityConverter x:Key="BoolToVisibilityConverter"/>
</Window.Resources>
<TabControl ItemsSource="{Binding Items}" SelectedItem="{Binding SelectedItem}">
<TabControl.ItemContainerStyle>
<Style TargetType="TabItem">
<Setter Property="IsEnabled" Value="{Binding IsEnabled}"/>
<Setter Property="Visibility" Value="{Binding IsVisible, Converter={StaticResource BoolToVisibilityConverter}}"/>
<Setter Property="Header" Value="{Binding Title}"/>
</Style>
</TabControl.ItemContainerStyle>
</TabControl>
</Window>
代码后台:
using System.Windows;
using BaseFramework.MVVM;
using System.Collections.ObjectModel;
namespace WpfApplication4
{
public partial class Window12 : Window
{
public Window12()
{
InitializeComponent();
DataContext = new TabbedViewModel()
{
Items =
{
new TabViewModel() {Title = "Tab #1", IsEnabled = true, IsVisible = true},
new TabViewModel() {Title = "Tab #2", IsEnabled = false, IsVisible = true},
new TabViewModel() {Title = "Tab #3", IsEnabled = true, IsVisible = false},
}
};
}
}
视图模型:
public class TabbedViewModel: ViewModelBase
{
private ObservableCollection<TabViewModel> _items;
public ObservableCollection<TabViewModel> Items
{
get { return _items ?? (_items = new ObservableCollection<TabViewModel>()); }
}
private ViewModelBase _selectedItem;
public ViewModelBase SelectedItem
{
get { return _selectedItem; }
set
{
_selectedItem = value;
NotifyPropertyChange(() => SelectedItem);
}
}
}
public class TabViewModel: ViewModelBase
{
private string _title;
public string Title
{
get { return _title; }
set
{
_title = value;
NotifyPropertyChange(() => Title);
}
}
private bool _isEnabled;
public bool IsEnabled
{
get { return _isEnabled; }
set
{
_isEnabled = value;
NotifyPropertyChange(() => IsEnabled);
}
}
private bool _isVisible;
public bool IsVisible
{
get { return _isVisible; }
set
{
_isVisible = value;
NotifyPropertyChange(() => IsVisible);
}
}
}
}
然后,对于每个选项卡,只需继承
TabViewModel
(在每个选项卡内创建适当的逻辑),以及为这些派生类中的每一个提供一个适当的
DataTemplate
在
app.xaml
或其他地方。
每当您想要从视图中删除选项卡项时,不要操作视图,而是操作ViewModel。这是WPF的全部方法。它通过消除在代码中操作复杂对象(UI元素)的需要来简化一切。每当设置
TabbedViewModel.SelectedItem.IsVisible = false;
时,请确保还执行以下操作:
TabbedViewModel.SelectedItem = TabbedViewModel.Items.First(x => x.IsVisible && x.IsEnabled);
这将防止您选择了一个不可见的选项卡项。
TabControl
只是一个ObservableCollection<ViewModel>
的图形表示,每个视图模型都由一个选项卡项表示,并且在给定时间只有1个SelectedItem
。 - Federico Berasategui