Question

在附加的XAML中，您将看到一个列表框。当它绑定到的（在视图模型中）的ItemsSource属性为空时，DragDrop操作似乎可用（拖动光标显示它可以被删除）。问题是一旦ListBox被绑定，它就不再接受drop。我可以看到，如果我将光标放入列表框和控件边缘之间的空间，我的控件将接受丢弃，因此显然是列表框中的内容。

有没有人有任何想法？

<UserControl x:Class="SilverWare.Avrio.Presentation.Silverlight.Controls.MenuPanelDesigner"
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:converters="clr-namespace:SilverWare.Avrio.Presentation.Silverlight.ValueConverters"
xmlns:controlToolkit="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Toolkit"
xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"
mc:Ignorable="d"
d:DesignHeight="600" d:DesignWidth="500"
MouseLeftButtonUp="MenuPanelDesigner_MouseLeftButtonUp"
MouseMove="MenuPanelDesigner_MouseMoved"
LostMouseCapture="MenuPanelDesigner_LostMouseCapture"
DataContext="{Binding MenuLayoutDesigner, Source={StaticResource Locator}}" AllowDrop="True">
<UserControl.Resources>
    <DataTemplate x:Key="PanelButtonContainerTemplate">
        <Border RenderTransformOrigin="0.5,0.5" MouseLeftButtonDown="MenuPanelDesigner_MouseLeftButtonDown" Width="{Binding PanelButton.DTO.Width}" Height="{Binding PanelButton.DTO.Height}">
            <TextBlock Text="{Binding PanelButton.DefaultLabel}" VerticalAlignment="Center" TextAlignment="Center" TextWrapping="Wrap" />
        </Border>
    </DataTemplate>
</UserControl.Resources>

<Grid>
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="1*" />
        <ColumnDefinition Width="Auto" />
        <ColumnDefinition Width="1*" />
    </Grid.ColumnDefinitions>
    <Grid.RowDefinitions>
        <RowDefinition Height="Auto" />
        <RowDefinition Height="Auto" />
    </Grid.RowDefinitions>
    <Border Margin="-4" Background="{Binding SelectedMenuGroup.Panel.BackColorBrush}" CornerRadius="10,10,10,10" Grid.Column="1" AllowDrop="True" />
    <controlToolkit:ListBoxDragDropTarget Grid.Column="1" AllowDrop="True">
        <ListBox ItemsSource="{Binding SelectedMenuGroup.MenuGroupItems}" Width="495" Height="625" Background="Transparent" 
                 ItemTemplate="{StaticResource PanelButtonContainerTemplate}" x:Name="lstMenuItems" BorderBrush="Black" BorderThickness="2"
                 SelectionMode="Extended" SelectedItem="{Binding SelectedMenuGroupItem, Mode=TwoWay}" AllowDrop="True">
            <ListBox.ItemsPanel>
               <ItemsPanelTemplate>
                    <Canvas AllowDrop="True" />   
               </ItemsPanelTemplate>
            </ListBox.ItemsPanel>
            <ListBox.ItemContainerStyle>
                <Style TargetType="ListBoxItem">
                    <Setter Property="Padding" Value="0,0,0,0"/>
                    <Setter Property="Canvas.Top" Value="{Binding PanelButton.DTO.Y, Mode=TwoWay}" />
                    <Setter Property="Canvas.Left" Value="{Binding PanelButton.DTO.X, Mode=TwoWay}" />
                    <Setter Property="Width" Value="{Binding PanelButton.DTO.Width, Mode=TwoWay}" />
                    <Setter Property="Height" Value="{Binding PanelButton.DTO.Height, Mode=TwoWay}" />
                </Style>
            </ListBox.ItemContainerStyle>
        </ListBox>
    </controlToolkit:ListBoxDragDropTarget>
    <Button Grid.Row="1" Grid.Column="1" Command="{Binding AddItem}" Content="Add Item" />
</Grid>

Answer 1

我发现当基础controlToolkit:ListBoxDragDropTarget的背景是透明的时，ListBox不会拖放。将背景更改为其他内容，它应该可以正常工作。

Silverlight ListBoxDragDropTarget不接受Drop

1 个答案: