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PODesign-Time drag and drop
 

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    <p>I'm currently working of a project where my part is to design a Design Surface where the end user can add/remove/move controls at run-time.</p> <p>I followed this tutorial <a href="https://web.archive.org/web/20090310133636/http://www.divil.co.uk/net/articles/designers/hosting.asp" rel="nofollow noreferrer">"Hosting Windows Forms Designers, by Tim Dawson"</a>, and almost have implemented all the features I need.</p> <p><strong><em>Short story for those who don't want to read the tutorial :</em></strong> I implemented <a href="http://msdn.microsoft.com/en-us/library/system.componentmodel.design.idesignerhost%28VS.85%29.aspx" rel="nofollow noreferrer"><code>IDesignerHost</code></a>, <a href="http://IContainer" rel="nofollow noreferrer"><code>IContainer</code></a>, <a href="http://msdn.microsoft.com/en-us/library/system.componentmodel.design.iselectionservice.aspx" rel="nofollow noreferrer"><code>ISelectionService</code></a>, <a href="http://msdn.microsoft.com/en-us/library/system.drawing.design.itoolboxservice%28VS.85%29.aspx" rel="nofollow noreferrer"><code>IToolboxService</code></a> and some other interface, to create my design surface. I didn't use the <a href="http://msdn.microsoft.com/en-us/library/system.componentmodel.design.designsurface%28VS.85%29.aspx" rel="nofollow noreferrer"><code>System.ComponentModel.Design.DesignSurface</code></a> already in the framework, mainly beacause I need a really custom design surface.</p> <h2>Question :</h2> <p>I want to allow user to drag &amp; drop new <code>Control</code> from the <code>IToolboxService</code> to the <code>IDesignerHost/IContainer</code>. In this tutorial, you clic on a <code>Control</code> in the toolbox, the click on the design surface to add the control.</p> <h2>What i've found :</h2> <ul> <li>There is a built-in feature that automagically does drag &amp; drop from <code>IToolboxService</code> to <code>System.ComponentModel.Design.DesignSurface</code> but it is clearly not working if you implement IDesignerHost from nothing.</li> <li><p>When you use the <code>Control.DoDragDrop(ToolboxItem)</code> method, to initiate a drag &amp; drop :</p> <ol> <li><code>IToolboxService.SerializeToolboxItem(ToolboxItem)</code> is called to serialize the item </li> <li><code>IToolboxService.IsToolboxItem(object)</code> and<br> <code>IToolboxService.IsSupported(object)</code> are called to evaluate if the<br> serialized ToolboxItem can be allowed to be droped on the design surface</li> <li>When you drop the control : <code>IToolboxService.DeserializeToolboxItem(object serializedObject)</code> is called by the design surface to deserialize the controldropped.</li> </ol></li> <li><p><code>IToolboxService.SetCursor()</code> is called to know if you define a custom cursor, or let the standard windows cursor.</p></li> </ul> <h2>Problem :</h2> <p>I implemented all mentionned above, in the "What i've found", but the drag &amp; drop is buggy : </p> <ul> <li>I drag, everything's fine, but when hovering the design surface, my cursor blink a little between standard cursor and the "<code>DragDropEffects.Copy</code>" style.</li> <li>When I drop, nothing happens, and when my cursor leave the design surface (after I dropped), then the new <code>Control</code> is created and added where I dropped it.</li> </ul> <p>Has anyone ever tried to do what I'm doing, and if so, how did you manage it ? Is there anyone that has any pointer/link/good advices ?</p> <p>Thank you =)</p>
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