How to display a short term lock in a view?

Question

Hello,
I discovered recently the two checkin/checkout modes in sharepoint.
The long term ckeckout that the user choose explicitly to have and the short term check out when the user open an office document for modification.
This article describe the differences between the two modes: http://blogs.technet.com/harikumh/archive/2008/05/28/check-out-feature-of-sharepoint-2007.aspx
The short term checkout is perfect for my client needs. He doesn't want to checkout a document every time he opens it + a lot of user doesn't understand why to check-in a document when they have done their works.
Here is my problem: I would like to display the short term lock in my document library the same way the long term lock information is displayed.
By code I'm able to see who has acquired the lock and if it is a short term or long term lock:
SPFile.SPCheckOutStatus
The column "CheckedOutBy" in by document library does not display anything for the short term lock. The document icon is not change to display a lock on it.
So I'm searching for an idea, how to be able to display this information in my view?
Best Regards,
Py

Answer 1

Hi,
Theoretically you can do the following:
Create a custom web service based on the object model to get the value of vti_sourcecontrollockexpires metadata of a file remotely.
Create a custom field that display the information in edit and display view based on the of vti_sourcecontrollockexpires metadata using the object model in a label. Create a RenderPattern for the list view that contains a JavaScript block that calls your custom web service to display the short lock information.
I suggest you to read these basic articles that describe the process of custom field type creation:
Create custom field types for SharePoint
http://www.sharepointblogs.com/nicksevens/archive/2007/08/31/create-custom-field-types-for-sharepoint.aspx
Developing Custom Field Types for SharePoint 2007
http://msdn.microsoft.com/en-us/magazine/dd727508.aspx
Building Custom Field Types in Windows SharePoint Services 3.0
http://msdn.microsoft.com/en-us/library/bb684919.aspx
And an advanced one about Web Service - JavaScript - RenderPattern integration:
Using AJAX Jquery-like in the CAML of Custom Field Types
http://www.silver-it.com/node/34
And about custom web services:
Walkthrough: Creating a Custom Web Service
http://msdn.microsoft.com/en-us/library/ms464040.aspx
Creating a Custom Web Service for SharePoint
http://it.toolbox.com/blogs/sharepoint-blog/creating-a-custom-web-service-for-sharepoint-13553
SharePoint for Developers Part 6 – Custom web services
http://blogs.msdn.com/kaevans/archive/2009/04/30/sharepoint-for-developers-part-6-custom-web-services.aspx
Hope that helps. Sounds to be not easy, but technologically possible.
Peter