Re: Drag and Drop ListBox in Silverlight Child Windows

05-18-2009 3:39 AM |

As I understand , you want to drag and drop controls contained in Childwindow. If I misunderstand you, please correct me.

I think it's quite the same with D&D in UserControl.

it's my sample

<controls:ChildWindow x:Class="SL3_test1.ChildWindow3"
           xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
           xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
           xmlns:controls="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls"
           Width="400" Height="300"
           Title="ChildWindow3">
    <Grid x:Name="LayoutRoot" Margin="2">
        <Grid.RowDefinitions>
            <RowDefinition />
            <RowDefinition Height="Auto" />
        </Grid.RowDefinitions>
        <Canvas Grid.Row="0" x:Name="canvas1">
            <Border CornerRadius="5" Padding="5" Background="Azure"
             MouseLeftButtonDown="Border_MouseLeftButtonDown"
             MouseLeftButtonUp="Border_MouseLeftButtonUp"
             MouseMove="Border_MouseMove">
                <ListBox ItemsSource="abcde"/>
            </Border>
        </Canvas>
        <Button x:Name="CancelButton" Content="Cancel" Click="CancelButton_Click" Width="75" Height="23" HorizontalAlignment="Right" Margin="0,12,0,0" Grid.Row="1" />
        <Button x:Name="OKButton" Content="OK" Click="OKButton_Click" Width="75" Height="23" HorizontalAlignment="Right" Margin="0,12,79,0" Grid.Row="1" />
    </Grid>
</controls:ChildWindow>

 code:

 

    public partial class ChildWindow3 : ChildWindow
    {
        public ChildWindow3()
        {
            InitializeComponent();
        }

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

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

        bool _isdrag;
        Point _startpos;
        double _xpos, _ypos;
        private void Border_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            _isdrag = true;
            _startpos = e.GetPosition(this);
 
            var ue1 = sender as UIElement;
            _xpos = Canvas.GetLeft(ue1);
            _ypos = Canvas.GetTop(ue1);

            ue1.CaptureMouse();
        }

        private void Border_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
        {
            _isdrag = false;
        }

        private void Border_MouseMove(object sender, MouseEventArgs e)
        {
            var ue1 = sender as UIElement;
            Point curpoint= e.GetPosition(this);
            double xoffset = curpoint.X - _startpos.X;
            double yoffset = curpoint.Y - _startpos.Y;


            if (_isdrag)
            {
                Canvas.SetLeft(ue1, _xpos + xoffset);
                Canvas.SetTop(ue1, _ypos + yoffset);
            }
        }
    }