开发者

Dragging a Rectangle which is inside a Grid

开发者 https://www.devze.com 2023-01-13 09:00 出处：网络
I managed to sort my \"draggable inside grid\" issue, however I found another issue. When I start dragging the Rectangle, it dissapears and reappears on mouseup.
相关专题：silverlight

I managed to sort my "draggable inside grid" issue, however I found another issue.

When I start dragging the Rectangle, it dissapears and reappears on mouseup.

My code:

public Page()
  {
   InitializeComponent();

   dragGrid.AddHandler(RadDragAndDropManager.DragQueryEvent, new EventHandler<DragDropQueryEventArgs>(OnDragQuery));
   dragGrid.AddHandler(RadDragAndDropManager.DropQueryEvent, new EventHandler<DragDropQueryEventArgs>(OnDropQuery));
   dragGrid.AddHandler(RadDragAndDropManager.DropInfoEvent, new EventHandler<DragDropEventArgs>(OnDropInfo));
   dragGrid.AddHandler(RadDragAndDropManager.DragInfoEvent, new EventHandler<DragDropEventArgs>(OnDragInfo));

   Loaded += new RoutedEventHandler(Page_Loaded);
  }

  void Page_Loaded(object sender, RoutedEventArgs e)
  {
   //Initialise the draggable elements
   RadDragAndDropManager.SetAllowDrag(onePX, true);
   RadDragAndDropManager.SetAllowDrag(twoPX, true);
   RadDragAndDropManager.SetAllowDrag(fourPX, true);
  }

  private void OnDragQuery(object sender, DragDropQueryEventArgs e)
  {
   if (e.Options.Status == DragStatus.DragQuery)
   {
    e.QueryResult = true;

    //The DragAndDropmanager will detach the element and drag it around the screen. 
    var source = e.Options.Source as Rectangle;
    source.Visibility = Visibility.Collapsed;

    e.Options.Payload = source;

    e.Handled = true;
   }

   if (e.Options.Status == DragStatus.DropSourceQuery)
   {
    e.QueryResult = true;
   }
  }

  private void OnDropQuery(object sender, DragDropQueryEventArgs e)
  {
   if (e.Options.Status == DragStatus.DropDestinationQuery)
   {
    e.QueryResult = true;
   }
  }

  private void OnDragInfo(object sender, DragDropEventArgs e)
  {
   if (e.Options.Status == DragStatus.DragCancel)
   {
    e.Options.Source.Visibility = Visibility.Visible;
   }
  }

  private void OnDropInfo(object sender, DragDropEventArgs e)
  {
   if (e.Options.Status == DragStatus.DropComplete)
   {
    Grid.SetColumn(e.Options.Source, Grid.GetColumn(e.Options.Destination));
    Grid.SetRow(e.Options.Source, Grid.GetRow(e.Options.Destination));

    e.Options.Source.Visibility = Visibility.Visible;

    e.Handled = true;
   }
  }

XAML:

<UserControl
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:dragDrop="clr-namespace:Telerik.Windows.Controls.DragDrop;assembly=Telerik.Windows.Controls"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d" x:Class="TestBench.Page"
        MinHeight="500" MinWidth="300">
    <Grid x:Name="LayoutRoot" Background="White">
     <Grid x:Name="dragGrid" Margin="0,0,0,58" ShowGridLines="False">
      <Grid.RowDefinitions>
       <RowDefinition Height="32" />
       <RowDefinition Height="32" />
       <RowDefinition Height="32" />
       <RowDefinition Height="32" />
       <RowDefinition Height="32" />
       <RowDefinition Height="32" />
       <RowDefinition Height="32" />
       <RowDefinition Height="32" />
       <RowDefinition Height="32" />
       <RowDefinition Height="32" />
       <RowDefinition Height="32" />
       <RowDefinition Height="32" />
       <RowDefinition Height="32" />
       <RowDefinition Height="32" />
      </Grid.RowDefinitions>
      <Grid.ColumnDefinitions>
       <ColumnDefinition Width="32" />
       <ColumnDefinition Width="32" />
       <ColumnDefinition Width="32" />
       <ColumnDefinition Width="32" />
       <ColumnDefinition Width="32" />
       <ColumnDefinition Width="32" />
       <ColumnDefinition Width="32" />
       <ColumnDefinition Width="32" />
       <ColumnDefinition Width="32" />
       <ColumnDefinition Width="32" />
       <ColumnDefinition Width="32" />
       <ColumnDefinition Width="32" />
       <ColumnDefinition Width="32" />
      </Grid.ColumnDefinitions>

      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="0" Grid.Row="0" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="1" Grid.Row="0" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="2" Grid.Row="0" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="3" Grid.Row="0" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="4" Grid.Row="0" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="5" Grid.Row="0" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="6" Grid.Row="0" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="7" Grid.Row="0" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="8" Grid.Row="0" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="9" Grid.Row="0" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="10" Grid.Row="0" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="11" Grid.Row="0" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="12" Grid.Row="0" />

      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="0" Grid.Row="1" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="1" Grid.Row="1" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="2" Grid.Row="1" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="3" Grid.Row="1" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="4" Grid.Row="1" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="5" Grid.Row="1" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="6" Grid.Row="1" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="7" Grid.Row="1" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="8" Grid.Row="1" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="9" Grid.Row="1" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="10" Grid.Row="1" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="11" Grid.Row="1" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="12" Grid.Row="1" />

      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="0" Grid.Row="2" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="1" Grid.Row="2" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="2" Grid.Row="2" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="3" Grid.Row="2" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="4" Grid.Row="2" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="5" Grid.Row="2" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="6" Grid.Row="2" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="7" Grid.Row="2" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="8" Grid.Row="2" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="9" Grid.Row="2" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="10" Grid.Row="2" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="11" Grid.Row="2" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="12" Grid.Row="2" />

      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="0" Grid.Row="3" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="1" Grid.Row="3" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="2" Grid.Row="3" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="3" Grid.Row="3" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="4" Grid.Row="3" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="5" Grid.Row="3" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="6" Grid.Row="3" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="7" Grid.Row="3" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="8" Grid.Row="3" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="9" Grid.Row="3" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="10" Grid.Row="3" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="11" Grid.Row="3" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="12" Grid.Row="3" />

      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="0" Grid.Row="4" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="1" Grid.Row="4" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="2" Grid.Row="4" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="3" Grid.Row="4" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="4" Grid.Row="4" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="5" Grid.Row="4" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="6" Grid.Row="4" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="7" Grid.Row="4" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="8" Grid.Row="4" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="9" Grid.Row="4" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="10" Grid.Row="4" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="11" Grid.Row="4" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="12" Grid.Row="4" />

      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="0" Grid.Row="5" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="1" Grid.Row="5" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="2" Grid.Row="5" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="3" Grid.Row="5" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="4" Grid.Row="5" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="5" Grid.Row="5" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="6" Grid.Row="5" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="7" Grid.Row="5" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="8" Grid.Row="5" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="9" Grid.Row="5" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="10" Grid.Row="5" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="11" Grid.Row="5" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="12" Grid.Row="5" />

      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="0" Grid.Row="6" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="1" Grid.Row="6" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="2" Grid.Row="6" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="3" Grid.Row="6" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="4" Grid.Row="6" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="5" Grid.Row="6" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="6" Grid.Row="6" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="7" Grid.Row="6" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="8" Grid.Row="6" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="9" Grid.Row="6" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="10" Grid.Row="6" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="11" Grid.Row="6" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="12" Grid.Row="6" />

      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="0" Grid.Row="7" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="1" Grid.Row="7" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="2" Grid.Row="7" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="3" Grid.Row="7" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="4" Grid.Row="7" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="5" Grid.Row="7" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="6" Grid.Row="7" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="7" Grid.Row="7" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="8" Grid.Row="7" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="9" Grid.Row="7" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="10" Grid.Row="7" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="11" Grid.Row="7" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="12" Grid.Row="7" />

      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="0" Grid.Row="8" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="1" Grid.Row="8" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="2" Grid.Row="8" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="3" Grid.Row="8" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop开发者_StackOverflow中文版="True" Fill="LightBlue"
       Grid.Column="4" Grid.Row="8" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="5" Grid.Row="8" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="6" Grid.Row="8" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="7" Grid.Row="8" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="8" Grid.Row="8" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="9" Grid.Row="8" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="10" Grid.Row="8" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="11" Grid.Row="8" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="12" Grid.Row="8" />

      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="0" Grid.Row="9" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="1" Grid.Row="9" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="2" Grid.Row="9" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="3" Grid.Row="9" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="4" Grid.Row="9" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="5" Grid.Row="9" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="6" Grid.Row="9" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="7" Grid.Row="9" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="8" Grid.Row="9" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="9" Grid.Row="9" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="10" Grid.Row="9" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="11" Grid.Row="9" />
      <Rectangle dragDrop:RadDragAndDropManager.AllowDrop="True" Fill="LightBlue"
       Grid.Column="12" Grid.Row="9" />

      <Rectangle Width="32" Height="32" Fill="Black" x:Name="onePX"
       Grid.Column="0" Grid.Row="0" />

      <Rectangle Width="32" Height="64" Fill="Black" x:Name="twoPX"
       Grid.Column="0" Grid.Row="2" Grid.RowSpan="2" />

      <Rectangle Width="64" Height="64" Fill="Black" x:Name="fourPX"
       Grid.Column="0" Grid.Row="5"
       Grid.ColumnSpan="2"
       Grid.RowSpan="2" />
      <TextBlock x:Name="textOutput" HorizontalAlignment="Left" Margin="8,8,0,8" Grid.Row="10" Grid.RowSpan="2" TextWrapping="Wrap" Text="TextBlock" d:LayoutOverrides="Height" Grid.ColumnSpan="6" Width="184"/>
     </Grid>
    </Grid>
</UserControl>

Now, I know that my code is detaching the Rectangle from the Grid (which is why it's dissapearing), any idea how I can stop this (or an elegant work around would be nice) ^_^

Your drag does not set a drag cue. SImplest fix is to add this code in the middle of your OnDragQuery. You will then get a nice matching rectangle dragging around on the cursor:

        source.Visibility = Visibility.Collapsed;
        /* add these 5 lines - copies properties into a drag cue  */
        var cue = new Rectangle();
        cue.Height = source.Height;
        cue.Width = source.Width;
        cue.Fill = source.Fill;
        e.Options.DragCue = cue;

        e.Options.Payload = source;

I turned on the grid so you could see the effect clearly in this screen-shot as the 2x2 rectangle is dragged:

Dragging a Rectangle which is inside a Grid

0

上一篇:

:下一篇

更多 问答 相关资讯：

精彩评论

暂无评论...
登录 注册
Qedev.com
验证码 换一张
取 消

    关注公众号

    热门标签

    图文推荐

    Delphi - Custom drawing a message list

    Delphi - Custom drawing a message list
    C++ header-only include pattern

    C++ header-only include pattern
    IE7 Margin Collapses Into Padding

    IE7 Margin Collapses Into Padding
    in CoffeeScript, how can I use a variable as a key in a hash?

    in CoffeeScript, how can I use a variable as a key in a hash?
    Interactive visualization of a graph in python [closed]

    Interactive visualization of a graph in python [closed]
    How to customise PHP MYSQL tables?

    How to customise PHP MYSQL tables?
    High quality, simple random password generator

    High quality, simple random password generator
    Image Recognition ApI in android

    Image Recognition ApI in android

    开发者开发者网给大家分享系统运维,大数据运维,云计算,编程开发技巧,路由交换,运维和开发相关的资讯及技术文章，同时StackOverflow中文社区，知识经验交流分享。

    法律声明：本站内容均为网友上传，网站举办方负责审核和监督，如存在版权或非法内容，欢迎举报，我们将尽快予以删除。邮箱：devze@qq.com

    Copyright © 2018-2020 开发者. All rights reserved. Powered by 开发者ICP备案号: 京ICP备10032868号-9