Question

我打算禁用和启用TabControl外部的按钮，就像更改当前选项卡时TabItem内部的按钮一样。但TabItem的CommandBindings似乎并没有影响视觉树的“向上”。什么是正确的方法呢？

使用此XAML：

<Window x:Class="WpfApplication10.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="clr-namespace:WpfApplication10"
    Title="MainWindow" Height="350" Width="525">
<StackPanel>
    <Button Content="MyCommand1" Command="local:MainWindow.MyCommand1" />
    <Button Content="MyCommand2" Command="local:MainWindow.MyCommand2" />
    <TabControl>
        <TabItem Header="tabItem1" Name="tabItem1">
            <TabItem.CommandBindings>
                <CommandBinding Command="local:MainWindow.MyCommand1" 
                                Executed="ExecuteMyCommand" />
            </TabItem.CommandBindings>
            <StackPanel>
                <Button Content="MyCommand1" Command="local:MainWindow.MyCommand1" />
                <Button Content="MyCommand2" Command="local:MainWindow.MyCommand2" />
            </StackPanel>
        </TabItem>
        <TabItem Header="tabItem2" Name="tabItem2">
            <TabItem.CommandBindings>
                <CommandBinding Command="local:MainWindow.MyCommand2" 
                                Executed="ExecuteMyCommand"/>
            </TabItem.CommandBindings>
            <StackPanel>
                <Button Content="MyCommand1" Command="local:MainWindow.MyCommand1" />
                <Button Content="MyCommand2" Command="local:MainWindow.MyCommand2" />
            </StackPanel>
        </TabItem>
    </TabControl>
</StackPanel>
</Window>

使用此代码背后：

    public static readonly RoutedUICommand MyCommand1 = new RoutedUICommand();
    public static readonly RoutedUICommand MyCommand2 = new RoutedUICommand();
    public MainWindow()
    {
        InitializeComponent();
    }
    private void ExecuteMyCommand(object sender, ExecutedRoutedEventArgs e)
    {
        MessageBox.Show("Hello");
    }

Answer 1

MSFT在他们的WPF论坛（http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/bb3d1eb1-96fa-4fbc-beda-799613acb9f7）

中给了我正确的答案

<StackPanel>
     <StackPanel FocusManager.IsFocusScope="True">
         <Button Content="MyCommand1" Command="local:Window8.MyCommand1" />
         <Button Content="MyCommand2" Command="local:Window8.MyCommand2" />
     </StackPanel>
     <TabControl>
         <TabItem Header="tabItem1" Name="tabItem1">
             <TabItem.CommandBindings>
                 <CommandBinding Command="local:Window8.MyCommand1" Executed="ExecuteMyCommand" />
             </TabItem.CommandBindings>
             <StackPanel>
                 <Button Content="MyCommand1" Command="local:Window8.MyCommand1" />
                 <Button Content="MyCommand2" Command="local:Window8.MyCommand2" />
             </StackPanel>
         </TabItem>
         <TabItem Header="tabItem2" Name="tabItem2">
             <TabItem.CommandBindings>
                 <CommandBinding Command="local:Window8.MyCommand2" Executed="ExecuteMyCommand"/>
             </TabItem.CommandBindings>
             <StackPanel>
                 <Button Content="MyCommand1" Command="local:Window8.MyCommand1" />
                 <Button Content="MyCommand2" Command="local:Window8.MyCommand2" />
             </StackPanel>
         </TabItem>
     </TabControl>
</StackPanel>

Answer 2

这是所有代码吗？

您是否定义了一个特殊的CanExecute，它会禁用MyCommandsX？
或者你对绑定按钮的Enabled属性有绑定，你实现了INotifyPropertyChanged或什么？

或者为什么要在代码示例中启用/禁用它们？
我问你，我不希望代码禁用按钮..

更新1：

例如，您可以通过在周围的堆栈面板中添加命令绑定来启用按钮，方法与此相同。

    <StackPanel>
    <StackPanel.CommandBindings>
            <CommandBinding Command="local:MainWindow.MyCommand1"  
                            Executed="ExecuteMyCommand" />
    </StackPanel.CommandBindings>
    <Button Content="MyCommand1" Command="local:MainWindow.MyCommand1" />
    <Button Content="MyCommand2" Command="local:MainWindow.MyCommand2" />
    <TabControl>

您可以使用命令绑定的CanExecute部分来验证启用绑定按钮的条件。相反，你应该自己处理命令本身。

Answer 3

您没有任何可以禁用按钮的代码。您可以通过以下几种方式实现：

<强> 1。定义CanExecute事件处理程序。

<CommandBinding Command="local:MainWindow.MyCommand1" 
        Executed="ExecuteMyCommand" 
        CanExecute="MyCommand_CanExecute"/>

代码背后：

private void MyCommand_CanExecute(object sender, CanExecuteRoutedEventArgs e)
{
    e.CanExecute = tabItem1.IsSelected;
}

<强> 2。将按钮IsEnabled属性绑定到标签项IsSelected属性

<Button IsEnabled="{Binding ElementName=tabItem1, Path=IsSelected}" 
        Content="MyCommand1" Command="local:MainWindow.MyCommand1" />

每个选项卡带有绑定的WPF路由命令

3 个答案: