仅允许在 ListBox 中右键单击来选择项目

Posted 2023-05-08

【中文标题】仅允许在 ListBox 中右键单击来选择项目

【英文标题】：Allow select items only with right click in ListBox

【发布时间】：2014-01-10 06:36:05

【问题描述】：

我仍在尝试这样做。不知道怎么做。我有一个带有拖放功能的 ListBox 来移动项目并添加新项目。我想要做的是当用户用鼠标左键单击项目时没有任何反应。当他用鼠标右键单击时，它会选择它（多选）。 我试过e.Handled = true，问题是它不允许用户用鼠标滚动。我的列表框的事件：

    private void LB_SongList_Drop(object sender, DragEventArgs e)
    
        ListBox parent = sender as ListBox;
        Song data = e.Data.GetData(typeof(Song)) as Song;
        Song objectToPlaceBefore = GetObjectDataFromPoint(parent, e.GetPosition(parent)) as Song;
        if (data != null && objectToPlaceBefore != null)
        
            [...]//Code that moves object

            parent.SelectedItems.Remove(data);
        
        else
        
            String[] file = e.Data.GetData(DataFormats.FileDrop, true) as String[];
            if (file != null)
            
                [...]//Code that adds new data
            
        
    
    private void LB_SongList_PreviewMouseMove(object sender, MouseEventArgs e)
    
        if (!b_IsScrolling)
        
            if (e.LeftButton == MouseButtonState.Pressed)
            
                MainPointer.Main_AllowClose = false;
                ListBox parent = sender as ListBox;
                Song data = GetObjectDataFromPoint(parent, e.GetPosition(parent)) as Song;
                if (data != null)
                
                    parent.SelectedItems.Remove(data);
                    DragDrop.DoDragDrop(parent, data, DragDropEffects.Move);
                
            
        
    
    private static object GetObjectDataFromPoint(ListBox source, Point point)
    
        UIElement element = source.InputHitTest(point) as UIElement;
        if (element != null)
        
            object data = DependencyProperty.UnsetValue;
            while (data == DependencyProperty.UnsetValue)
            
                data = source.ItemContainerGenerator.ItemFromContainer(element);
                if (data == DependencyProperty.UnsetValue) element = VisualTreeHelper.GetParent(element) as UIElement;
                if (element == source) return null;
            
            if (data != DependencyProperty.UnsetValue) return data;
        
        return null;
    
    private void LB_SongList_PreviewMouseDoubleClick(object sender, MouseButtonEventArgs e)
    
        if (e.LeftButton == MouseButtonState.Pressed)
        
            ListBox parent = sender as ListBox;
            Song data = GetObjectDataFromPoint(parent, e.GetPosition(parent)) as Song;
            if (data != null)
            
                LB_SongList.SelectedItems.Remove(data);
                [...]//Code that plays a song on double click (should allow only left mouse button)
            
        
    
    private void LB_SongList_SelectionChanged(object sender, SelectionChangedEventArgs e)
    

        if (LB_SongList.SelectedItems.Count != 0)
        
            [...]
        
        else
        
            [...]
        
    

有人可以帮忙吗？鼠标左键不选择任何项目。鼠标右键确实选择项目（多个）。

【问题讨论】：

请将您的 xaml 发布给我们。

【参考方案1】：

再看看你的代码。如果您在询问 e.LeftButton，只需将其更改为 e.RightButoon...