Silverlight 5 中 Canvas 的拖放功能

发布于 2024-12-26 02:27:40 字数 1486 浏览 1 评论 0原文

我正在 Silverlight 5 中开发一个项目，几个月前我已经在 WPF 中实现了该项目。我想“嗯，过几天我会把它移植过来......”。错了：）

对于我的问题：我的窗口上有一个列表框和 2-3 个画布元素。列表框包含一些我想拖到画布上的字符串，并将其作为标签/文本框/面板或只是一个 UIElement 放置在那里。另外我想移动画布上的 UIElements 或将其移动到另一个画布。在 WPF 中，我可以毫无问题地做到这一点。过去 4 天我一直在寻找一个简单/好的解决方案，但我发现没有任何可用的解决方案。

是的，我知道 Silverlight Toolkit 有 DropTargets（ListBox、TreeView 等），但是是否可以编写自定义目标？ CanvasDropTarget 或者类似的东西？或者是否可以使用PanelDragDropTarget来解决这样的问题？

提前致谢，最好的问候

编辑：

我找到了一个线程，这似乎是我的解决方案的良好开端

http://forums.silverlight.net/p/194791/452957.aspx

所以，我找到了一个解决方案。我没想到这么简单。我只是用 PanelDragDropTarget 包围了 Canvas 并且它起作用了。

    <toolkit:PanelDragDropTarget AllowDrop="True" AllowedSourceEffects="All" Height="251" HorizontalAlignment="Left" Margin="26,27,0,0" Name="panelDragDropTarget1" VerticalAlignment="Top" Width="302" Grid.Column="1">
           <Canvas Name="canvas1" AllowDrop="True" Background="Green" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Height="249" Width="308"></Canvas>
    </toolkit:PanelDragDropTarget>

对于事件：

panelDragDropTarget1.Drop += new Microsoft.Windows.DragEventHandler(panelDragDropTarget1_Drop);        
panelDragDropTarget1.ItemDragStarting += new EventHandler<ItemDragEventArgs>(panelDragDropTarget1_ItemDragStarting);

你可以处理它。

原文

i'm working on a project in Silverlight 5, which i have implemented in WPF some months ago. I thought "huh, i will port it in some days..". Wrong :)

To my problem:
I have a listbox and 2-3 canvas-elements on my Window. The listbox contains some string which i want to drag to a Canvas and drop it there as label / textbox / panel or simply a UIElement. Additionaly i want to move the UIElements on the Canvas or move it to another canvas.
In WPF i had no problem to do that.
I'm was searching the last 4 days for a simple / good solution, but i found nothing useable.

Yeah, i know that Silverlight Toolkit has DropTargets (ListBox, TreeView, etc) but is it possible to write a custom targt? A CanvasDropTarget or something like that? Or is it possible to use the PanelDragDropTarget for such a problem?

thanks in advance,
best regards

Edit:

I found a thread which seems to be a good start for my solution

http://forums.silverlight.net/p/194791/452957.aspx

So, i found a solution. I didn't thought thats that simple. I just surrounded a Canvas with a PanelDragDropTarget and it worked.

    <toolkit:PanelDragDropTarget AllowDrop="True" AllowedSourceEffects="All" Height="251" HorizontalAlignment="Left" Margin="26,27,0,0" Name="panelDragDropTarget1" VerticalAlignment="Top" Width="302" Grid.Column="1">
           <Canvas Name="canvas1" AllowDrop="True" Background="Green" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Height="249" Width="308"></Canvas>
    </toolkit:PanelDragDropTarget>

and with the events:

panelDragDropTarget1.Drop += new Microsoft.Windows.DragEventHandler(panelDragDropTarget1_Drop);        
panelDragDropTarget1.ItemDragStarting += new EventHandler<ItemDragEventArgs>(panelDragDropTarget1_ItemDragStarting);

you can handle it.

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