切换按钮点击wpf

Question

我有4个选项卡，点击按钮移动到前面它应该改变标签下一个。但是在四个标签中，标签2是隐藏的，我不希望它显示。所以如果屏幕在标签1处，在向前移动时它应该显示标签3，并且在标签3中它应该打开标签4.同样如果在标签3处移回，它应该转到标签1而不显示标签2。此实现，但它还是到标签2.

 private void movefront_click(object sender, RoutedEventArgs e) 
    { 
     if (tabIUWM.SelectedIndex == 2) 
     { 
      TabStudyAreaInterface.Visibility = Visibility.Visible; //tabstudyareainterface is the name of tab 2 
     } 
     else 
     { 
      tabIUWM.SelectedIndex = tabIUWM.SelectedIndex + 1; 
     }   

    } 
    private void moveback_click(object sender, RoutedEventArgs e) 
    { 

     if (tabIUWM.SelectedIndex == 2) 
     { 
      TabStudyAreaInterface.Visibility = Visibility.Visible; 

     } 
     else 
     { 

      tabIUWM.SelectedIndex = tabIUWM.SelectedIndex - 1; 
     } 

     if (tabIUWM.SelectedIndex == -1) 
     { 
      MessageBox.Show("This is the beginning screen"); 
     } 

    } 

谢谢:)

Answer 1

在extension methods已被添加到TabControl类处理导航来回TabItem元素之间的以下解决方案。这些方法可以在您的点击事件中调用。所有TabControl中隐藏/折叠的项目都将被忽略。使用TabControl.PrevVisibleTab

MainWindow.cs

private void OnPrevClick(object sender, RoutedEventArgs e) 
{ 
    TabControl.PrevVisibleTab(); 
} 

private void OnNextClick(object sender, RoutedEventArgs e) 
{ 
    TabControl.NextVisibleTab(); 
} 

TabControlExtensions.cs

internal static class TabControlExtensions 
{ 
    public static void PrevVisibleTab(this TabControl tabControl) 
    { 
     var visibleTabs = tabControl.Items 
      .OfType<TabItem>() 
      .Where(t => t.Visibility == Visibility.Visible) 
      .ToList(); 

     if(tabControl.SelectedItem == null) 
     { 
      tabControl.SelectedItem = visibleTabs.LastOrDefault(); 
      return; 
     } 

     if(!visibleTabs.Contains(tabControl.SelectedItem)) 
     { 
      tabControl.SelectedItem = null; 
      return; 
     } 

     int index = visibleTabs.IndexOf(tabControl.SelectedItem as TabItem) - 1; 
     if(index < 0) index += visibleTabs.Count; 

     tabControl.SelectedItem = visibleTabs[index]; 
    } 

    public static void NextVisibleTab(this TabControl tabControl) 
    { 
     var visibleTabs = tabControl.Items 
      .OfType<TabItem>() 
      .Where(t => t.Visibility == Visibility.Visible) 
      .ToList(); 

     if(tabControl.SelectedItem == null) 
     { 
      tabControl.SelectedItem = visibleTabs.FirstOrDefault(); 
      return; 
     } 

     if(!visibleTabs.Contains(tabControl.SelectedItem)) 
     { 
      tabControl.SelectedItem = null; 
      return; 
     } 

     int index = (visibleTabs.IndexOf(tabControl.SelectedItem as TabItem) + 1) % visibleTabs.Count; 

     tabControl.SelectedItem = visibleTabs[index]; 
    } 
}