Solved

TListbox OnMeasureItem problems

Posted on 1998-03-03
6
365 Views
Last Modified: 2012-05-04
The OnMeasureItem event is only called when a new item is added.  Can it be set up to call it every time it is Invalidated?

My items change height a lot.  They cause the listbox to be repainted.  At the moment I have to cheat and set and unset a visual property to force a new measurement.  This results in a huge flicker.

eg.

Listbox.Ctl3d:=False;
Listbox.Ctl3d:=True;

Hmmm..
There must be an easy way round this!

Bryan
0
Comment
Question by:bcrotaz
  • 3
  • 2
6 Comments
 
LVL 5

Expert Comment

by:JimBob091197
ID: 1360051
I haven't tried this, but it may work:
  LockWindowUpdate(YourMainForm.Handle);
  ListBox.Ctl3d := False;
  ListBox.Ctl3d := True;
  LockWindowUpdate(0);

JB
0
 
LVL 1

Author Comment

by:bcrotaz
ID: 1360052
I'll try it...
0
 

Expert Comment

by:bijoyn
ID: 1360053
Have u tried using the OnDrawItem instead of OnMeasureItem. I am not sure what exactly u are doing with the height of the items in the Listbox but OnDrawItem will be called every time u select a Item or scroll through the Item. Addtionally this event is called when u call the Listbox's Invalidate  method.

Bijoy
0
Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

 
LVL 1

Author Comment

by:bcrotaz
ID: 1360054
I am using OnDrawItem to draw the items.  OnMeasureItem enables you to have variable height items.
0
 
LVL 1

Author Comment

by:bcrotaz
ID: 1360055
JimBob - can you send an answer?
That works perfectly - A bodge, but a working bodge!
0
 
LVL 5

Accepted Solution

by:
JimBob091197 earned 100 total points
ID: 1360056
Hehe, as long as it works, don't fix it...

0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
indy tidtcpclient threading issue 8 63
How to debug For loops? 3 45
Press three keys together and trigger a function 3 50
Error E2158 compiling with Delphi XE10 Seattle 2 86
This article explains how to create forms/units independent of other forms/units object names in a delphi project. Have you ever created a form for user input in a Delphi project and then had the need to have that same form in a other Delphi proj…
Hello everybody This Article will show you how to validate number with TEdit control, What's the TEdit control? TEdit is a standard Windows edit control on a form, it allows to user to write, read and copy/paste single line of text. Usua…
Along with being a a promotional video for my three-day Annielytics Dashboard Seminor, this Micro Tutorial is an intro to Google Analytics API data.
Both in life and business – not all partnerships are created equal. As the demand for cloud services increases, so do the number of self-proclaimed cloud partners. Asking the right questions up front in the partnership, will enable both parties …

911 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

16 Experts available now in Live!

Get 1:1 Help Now