 |
 | Home | Contact Us | FAQ | Search & Site Map | Link to Us |
 | Sign In | Join | Other 45 Sites in Network |
.NET Forum / Windows Forms / WinForm General / March 2006Do .NET controls have equivalent of LPSTR_TEXTCALLBACK
Let's try this with a better subject since I didn't get any responses before... Do the .NET list controls (trees, etc) have the equivalent of LPSTR_TEXTCALLBACK/I_IMAGECALLBACK/etc? I'm trying to port an existing application that makes extensive use of LVN_GETDISPINFO and would prefer not changing all that logic... Thankx! Dave Connet Entelos, Inc. >Let's try this with a better subject since I didn't get any responses >before... [quoted text clipped - 7 lines] >Dave Connet >Entelos, Inc. It might be helpful if you would tell us what those things do, or are. Otis Mukinfus http://www.arltex.com http://www.tomchilders.com I believe this depends on which version of .NET you're using. If I understand you correctly, you're asking about owner-drawn controls, which lets user specify how to draw an item in a list or tree view? .NET 2003 only has owner-drawn list boxes. But I believe that .NET 2005 also supports owner-drawn tree views and list views (I haven't upgraded yet, so I'm not sure). This might be a good article to start with: http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlr fsystemwindowsformslistboxclassdrawitemtopic.asp > I believe this depends on which version of .NET you're using. If I > understand you correctly, you're asking about owner-drawn controls, [quoted text clipped - 7 lines] > http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/ > html/frlrfsystemwindowsformslistboxclassdrawitemtopic.asp No, it's not really owner-draw. In Win32, the Listctrl and Treectrl send you a [LT]VN_GETDISPINFO message (via WM_NOTIFY) when they need to display text (that is, when you set the text to LPSTR_TEXTCALLBACK when the item is inserted). In the message, a structure is provided where you copy the text. So the control is still doing _all_ of the drawing - you are simply supplying the text on an as-needed basis. When you have a large number of items, one of the things this does is significantly cut down on memory usage since you are not inserting a copy of the data you already have. (I normally use listctrls in report mode) Dave Connet
Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
|
Reply to this Message
|
 Sign In
 Join
 My Latest Posts My Monitored Threads My Blog My Photo Gallery My Profile My Homepage Start New Thread Enable EMail Alerts Rate this Thread
|
©2008 Advenet LLC Privacy Policy - Terms of Use
This website includes both content owned or controlled by Advenet as well as content owned or controlled by third parties.