关于LibraryStack控件的简单问题 [英] Simple question on LibraryStack control

问题描述

亲爱的，

我正在使用包含图片集合的LibraryStack控件。在应用程序中，每个LibraryStack都包含来自其自己文件夹的图片。到目前为止一直很好。

我的情况如下：

我有5个不同的LibraryStack来自哪里我可以拖放图片了。但我想避免将属于FolderA的图片拖回错误的LibraryStack中。默认情况下它是允许的，因为对象都是相同的类型。



我尝试在LibraryStack上捕获不同的事件，以便在项目被删除并添加到事件之前捕获事件该集合然后进行测试，如果源目录相同但无法获得正确的事件来跟踪。

感谢您的帮助

serge

---

您的知识会被其他人的知识所提升。

解决方案

您好

   我认为你应该使用Surface
拖放式框架和
AddPreviewQueryTargetHandler方法

类似于：

 SurfaceDragDrop.AddPreviewQueryTargetHandler（YouConrol，OnPreviewQueryTargetYourControl）; 
 
 private void OnPreviewQueryTargetLibraryItems1（object sender，QueryTargetEventArgs e）
 {
 // event args具有检查拖动对象是否属于目标控件所需的全部
 if（（拖动对象属于目标控件）== false）
 {
 e.UseDefault = false; 
 e.ProposedTarget = null; 
} 
 e.Handled = true; 
} 

Dear all,

I am using the LibraryStack control which contains a collection of Pictures. In the application each LibraryStack contains pictures from its own folder. So far so good.

The scenario I have is the following :

I have 5 different LibraryStack from wich I can drag and drop pictures out. But I would like to avoid that a Picture belonging to FolderA gets dragged back in the wrong LibraryStack. By default it is allowed because objects are all same type.

I try to catch different event on LibraryStack in order to catch an event before the item gets drop and added to the collection and then make a test if the source directory is the same but could not get the proper event to track.

Thanks for help
serge

---

Your knowledge is enhanced by that of others.

解决方案

Hi

    i think you should use the Surface Drag-and-Drop Framework and AddPreviewQueryTargetHandler Method

Something like:

SurfaceDragDrop.AddPreviewQueryTargetHandler(YouConrol, OnPreviewQueryTargetYourControl);

private void OnPreviewQueryTargetLibraryItems1(object sender, QueryTargetEventArgs e)
        {
            //event args has all that you need to check if the dragged object belongs to the target control
            if ((dragged object belongs to target control) == false)
            {
                e.UseDefault = false;
                e.ProposedTarget = null;
            }
            e.Handled = true;
        }

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