try to make notepad++ with WPF

Question

1. Drap and Drop

2. can add Tab with button

**I tried to mix them. but Tab2 is not appeared immediately. I have to click button.
Can anyboy help this problem? Thank you! **

MainWindow.xaml xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:avalonedit="http://icsharpcode.net/sharpdevelop/avalonedit"
xmlns:local="clr-namespace:XMLEditor"
mc:Ignorable="d"
Title="MainWindow" Height="450" Width="800">

AllowDrop="True" PreviewDragOver="tabDynamic_PreviewDragOver" PreviewDrop="tabDynamic_PreviewDrop">

MainWindow.xaml.cs using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using ICSharpCode.AvalonEdit; namespace XMLEditor
{
///

/// Interaction logic for MainWindow.xaml
///

public partial class MainWindow : Window
{
private List _tabItems;
private TabItem _tabAdd;

       public MainWindow()   
       {  
           try  
           {  
               InitializeComponent();  

               // initialize tabItem array  
               _tabItems = new List();  

               // add a tabItem with + in header   
               _tabAdd = new TabItem();  
               _tabAdd.Header = "+";  
               // tabAdd.MouseLeftButtonUp += new MouseButtonEventHandler(tabAdd_MouseLeftButtonUp);  

               _tabItems.Add(_tabAdd);  

               // add first tab  
               this.AddTabItem();  

               // bind tab control  
               tabDynamic.DataContext = _tabItems;  

               tabDynamic.SelectedIndex = 0;  
           }  
           catch (Exception ex)  
           {  
               MessageBox.Show(ex.Message);  
           }  
       }  

       private TabItem AddTabItem()  
       {  
           int count = _tabItems.Count;  

           // create new tab item  
           TabItem tab = new TabItem();  

           tab.Header = string.Format("Tab {0}", count);  
           tab.Name = string.Format("tab{0}", count);  
           tab.HeaderTemplate = tabDynamic.FindResource("TabHeader") as DataTemplate;  

           tab.MouseDoubleClick += new MouseButtonEventHandler(tab_MouseDoubleClick);  

           // add controls to tab item, this case I added just a textbox  
           TextBox txt = new TextBox();  
           txt.Name = "txt";  

           tab.Content = txt;  

           // insert tab item right before the last (+) tab item  
           _tabItems.Insert(count - 1, tab);  

           return tab;  
       }  

       private void tabAdd_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)  
       {  
           // clear tab control binding  
           tabDynamic.DataContext = null;  

           TabItem tab = this.AddTabItem();  

           // bind tab control  
           tabDynamic.DataContext = _tabItems;  

           // select newly added tab item  
           tabDynamic.SelectedItem = tab;  
       }  

       private void tab_MouseDoubleClick(object sender, MouseButtonEventArgs e)  
       {  
           TabItem tab = sender as TabItem;  

           TabProperty dlg = new TabProperty();  

           // get existing header text  
           dlg.txtTitle.Text = tab.Header.ToString();  

           if (dlg.ShowDialog() == true)  
           {  
               // change header text  
               tab.Header = dlg.txtTitle.Text.Trim();  
           }  
       }  

       private void tabDynamic_SelectionChanged(object sender, SelectionChangedEventArgs e)  
       {  
           TabItem tab = tabDynamic.SelectedItem as TabItem;  
           if (tab == null) return;  

           if (tab.Equals(_tabAdd))  
           {  
               // clear tab control binding  
               tabDynamic.DataContext = null;  

               TabItem newTab = this.AddTabItem();  

               // bind tab control  
               tabDynamic.DataContext = _tabItems;  

               // select newly added tab item  
               tabDynamic.SelectedItem = newTab;  
           }  
           else  
           {  
               // your code here...  
           }  
       }  
       private void tabDynamic_PreviewDragOver(object sender, DragEventArgs e)  
       {  
           if (e.Data.GetDataPresent(DataFormats.FileDrop))  
           {  
               e.Effects = DragDropEffects.All;  
           }  
           else  
           {  
               e.Effects = DragDropEffects.None;  
           }  
           e.Handled = false;  
       }  

       private void tabDynamic_PreviewDrop(object sender, DragEventArgs e)  
       {  
           string[] fileloadup = (string[])e.Data.GetData(DataFormats.FileDrop);  

           e.Handled = true;  
           this.AddTabItem();  
       }  

       private void btnDelete_Click(object sender, RoutedEventArgs e)  
       {  
           string tabName = (sender as Button).CommandParameter.ToString();  

           var item = tabDynamic.Items.Cast().Where(i => i.Name.Equals(tabName)).SingleOrDefault();  

           TabItem tab = item as TabItem;  

           if (tab != null)  
           {  
               if (_tabItems.Count < 3)  
               {  
                   MessageBox.Show("Cannot remove last tab.");  
               }  
               else if (MessageBox.Show(string.Format("Are you sure you want to remove the tab '{0}'?", tab.Header.ToString()),  
                   "Remove Tab", MessageBoxButton.YesNo) == MessageBoxResult.Yes)  
               {  
                   // get selected tab  
                   TabItem selectedTab = tabDynamic.SelectedItem as TabItem;  

                   // clear tab control binding  
                   tabDynamic.DataContext = null;  

                   _tabItems.Remove(tab);  

                   // bind tab control  
                   tabDynamic.DataContext = _tabItems;  

                   // select previously selected tab. if that is removed then select first tab  
                   if (selectedTab == null || selectedTab.Equals(tab))  
                   {  
                       selectedTab = _tabItems[0];  
                   }  
                   tabDynamic.SelectedItem = selectedTab;  
               }  
           }  
       }  


   }

}

TabProperty.xaml
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:XMLEditor"
xmlns:avalonedit="http://icsharpcode.net/sharpdevelop/avalonedit"
mc:Ignorable="d"
d:DesignHeight="450" d:DesignWidth="800">
```
         

         
             
             
         
     
```
TabPropety.xaml.cs using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
using ICSharpCode.AvalonEdit;
namespace XMLEditor
{
///

/// TabProperty.xaml에 대한 상호 작용 논리
///

public partial class TabProperty : UserControl
{
public TabProperty()
{
InitializeComponent();
}
```
       public bool DialogResult { get; private set; }  

       private void btnOK_Click(object sender, RoutedEventArgs e)  
       {  
           this.DialogResult = true;  
       }  

       internal bool ShowDialog()  
       {  
           throw new NotImplementedException();  
       }  
   }  
```
}

Accepted Answer

I modified tabDynamic_PreviewDrop method, it can add TabItem by dragging Item to _tabAdd .

 private void tabDynamic_PreviewDrop(object sender, DragEventArgs e)  
    {  
      tabDynamic.DataContext = null;  

      string[] fileloadup = (string[])e.Data.GetData(DataFormats.FileDrop);  


      int count = _tabItems.Count;  
      TabItem tab = new TabItem();  
      tab.Header = string.Format("Tab {0}", count);  
      tab.Name = string.Format("tab{0}", count);  
      tab.HeaderTemplate = tabDynamic.FindResource("TabHeader") as DataTemplate;  
      tab.MouseDoubleClick += new MouseButtonEventHandler(tab_MouseDoubleClick);  
      tab.Content = File.ReadAllText(fileloadup[0]);  
      _tabItems.Insert(count - 1, tab);  
      tabDynamic.DataContext = _tabItems;  
      tabDynamic.SelectedItem = tab;  

      e.Handled = true;  
    }

The result:

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try to make notepad++ with WPF

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