有些错误与拖放从列表框项目 [英] Some mistake with drag and drop an item from listbox

问题描述

我有一个的ListBox 我要拖上一个矩形掉落物品。一切正常，当我刚刚的项目，而不是的ItemsSource 和的ItemTemplate ，但现在它从采集填补。有一次，我把它放到矩形我想另一个文本框来表示从属性值的保护

XAML

 <列表框
X：NAME =listhelmets
 HEIGHT =214 
 WIDTH =248
的ItemsSource ={结合ListHelmets}
 IsSynchronizedWithCurrentItem =真
 Canvas.Left =211
 Canvas.Top = 72
 PreviewMouseDown =helmet_MouseDown1
的PreviewMouseLeftButtonDown =helmet_PreviewMouseLeftButtonDown
 PreviewMouseMove =helmet_PreviewMouseMove> 
< ListBox.ItemTemplate> 
<&DataTemplate的GT; 
< StackPanel的方向=横向> 
<图像来源={绑定路径=图片}WIDTH =56HEIGHT =61/> 
<文本框的文本={绑定路径=保护}WIDTH =30HEIGHT =20/> 
< / StackPanel的> 
< / DataTemplate中> 
< /ListBox.ItemTemplate> 
< /列表框> 
  

代码背后

 私人无效helmet_MouseDown1（对象发件人，MouseButtonEventArgs E）
 {
 _startPoint = e.GetPosition（NULL）; 
 
 
} 
 
私人无效helmet_PreviewMouseMove（对象发件人，MouseEventArgs E）
 {
点mousePos结构= e.GetPosition（NULL）; 
矢量差异= _startPoint  -  mousePos结构; 
如果（e.LeftButton == MouseButtonState.Pressed&放大器;&安培; 
（Math.Abs​​（diff.X）GT; SystemParameters.MinimumHorizo​​ntalDragDistance || 
 Math.Abs​​（diff.Y） > SystemParameters.MinimumVerticalDragDistance））
 {
 
变种的ListBox =发件人列表框作为; 
 VAR ListBoxItem的= listBox.SelectedItem; 
 
数据对象dragData =新的DataObject（_dropIdentifier，ListBoxItem的）; 
 DragDrop.DoDragDrop（列表框，dragData，DragDropEffects.Move）; 
} 
} 
 
私人无效armature_MouseDown（对象发件人，MouseButtonEventArgs E）
 {
 _startPoint = e.GetPosition（NULL）; 
} 
 
私人无效armature_PreviewMouseMove（对象发件人，MouseEventArgs E）
 {
点mousePos结构= e.GetPosition（NULL）; 
矢量差异= _startPoint  -  mousePos结构; 
如果（e.LeftButton == MouseButtonState.Pressed&放大器;&安培; 
（Math.Abs​​（diff.X）GT; SystemParameters.MinimumHorizo​​ntalDragDistance || 
 Math.Abs​​（diff.Y） > SystemParameters.MinimumVerticalDragDistance））
 {
 
变种的ListBox =发件人列表框作为; 
 VAR ListBoxItem的= listBox.SelectedItem; 
 
数据对象dragData =新的DataObject（_dropIdentifier，ListBoxItem的）; 
 DragDrop.DoDragDrop（列表框，dragData，DragDropEffects.Move）; 
} 
} 
 
私人无效weapons_MouseDown（对象发件人，MouseButtonEventArgs E）
 {
 _startPoint = e.GetPosition（NULL）; 
} 
 
私人无效weapons_PreviewMouseMove（对象发件人，MouseEventArgs E）
 {
点mousePos结构= e.GetPosition（NULL）; 
矢量差异= _startPoint  -  mousePos结构; 
如果（e.LeftButton == MouseButtonState.Pressed&放大器;&安培; 
（Math.Abs​​（diff.X）GT; SystemParameters.MinimumHorizo​​ntalDragDistance || 
 Math.Abs​​（diff.Y） > SystemParameters.MinimumVerticalDragDistance））
 {
 
变种的ListBox =发件人列表框作为; 
 VAR ListBoxItem的= listBox.SelectedItem; 
 
数据对象dragData =新的DataObject（_dropIdentifier，ListBoxItem的）; 
 DragDrop.DoDragDrop（列表框，dragData，DragDropEffects.Move）; 
} 
} 
  

解决方案

一切没关系。我要让这个帖子，以防有人将尝试将它从列表框中

降

I have a ListBox and I want to drag and drop Items on a rectangle. Everything was okay when I had just items instead of ItemsSource and ItemTemplate, but now it's filled from collection. Once I drop it on rectangle I want another TextBox to show value from property "protection"

XAML

<ListBox 
   x:Name="listhelmets" 
   Height="214" 
   Width="248" 
   ItemsSource="{Binding ListHelmets}" 
   IsSynchronizedWithCurrentItem="True" 
   Canvas.Left="211" 
   Canvas.Top="72" 
   PreviewMouseDown="helmet_MouseDown1"    
   PreviewMouseLeftButtonDown="helmet_PreviewMouseLeftButtonDown"
   PreviewMouseMove="helmet_PreviewMouseMove">
   <ListBox.ItemTemplate >
      <DataTemplate >
         <StackPanel Orientation="Horizontal">
            <Image Source="{Binding Path=Image}" Width="56" Height="61"/>
            <TextBox Text="{Binding Path=protection}" Width="30" Height="20" />
         </StackPanel>
      </DataTemplate>
   </ListBox.ItemTemplate>
</ListBox>

code behind

 private void helmet_MouseDown1(object sender, MouseButtonEventArgs e)
    {
        _startPoint = e.GetPosition(null);


    }

    private void helmet_PreviewMouseMove(object sender, MouseEventArgs e)
    {
        Point mousePos = e.GetPosition(null);
        Vector diff = _startPoint - mousePos;
        if (e.LeftButton == MouseButtonState.Pressed &&
  (Math.Abs(diff.X) > SystemParameters.MinimumHorizontalDragDistance ||
  Math.Abs(diff.Y) > SystemParameters.MinimumVerticalDragDistance))
        {

            var listBox = sender as ListBox;
            var listBoxItem = listBox.SelectedItem;

            DataObject dragData = new DataObject(_dropIdentifier, listBoxItem);
            DragDrop.DoDragDrop(listBox, dragData, DragDropEffects.Move);
        } 
    }

    private void armature_MouseDown(object sender, MouseButtonEventArgs e)
    {
        _startPoint = e.GetPosition(null);
    }

    private void armature_PreviewMouseMove(object sender, MouseEventArgs e)
    {
        Point mousePos = e.GetPosition(null);
        Vector diff = _startPoint - mousePos;
        if (e.LeftButton == MouseButtonState.Pressed &&
  (Math.Abs(diff.X) > SystemParameters.MinimumHorizontalDragDistance ||
  Math.Abs(diff.Y) > SystemParameters.MinimumVerticalDragDistance))
        {

            var listBox = sender as ListBox;
            var listBoxItem = listBox.SelectedItem;

            DataObject dragData = new DataObject(_dropIdentifier, listBoxItem);
            DragDrop.DoDragDrop(listBox, dragData, DragDropEffects.Move);
        } 
    }

    private void weapons_MouseDown(object sender, MouseButtonEventArgs e)
    {
        _startPoint = e.GetPosition(null);
    }

   private void weapons_PreviewMouseMove(object sender, MouseEventArgs e)
    {
        Point mousePos = e.GetPosition(null);
        Vector diff = _startPoint - mousePos;
        if (e.LeftButton == MouseButtonState.Pressed &&
  (Math.Abs(diff.X) > SystemParameters.MinimumHorizontalDragDistance ||
  Math.Abs(diff.Y) > SystemParameters.MinimumVerticalDragDistance))
        {

            var listBox = sender as ListBox;
            var listBoxItem = listBox.SelectedItem;

            DataObject dragData = new DataObject(_dropIdentifier, listBoxItem);
            DragDrop.DoDragDrop(listBox, dragData, DragDropEffects.Move);
        } 
    }

解决方案

Everything is okay. I'll let this post in case someone will try to drag and drop from listbox

这篇关于有些错误与拖放从列表框项目的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！