Still celebrating National IT Professionals Day with 3 months of free Premium Membership. Use Code ITDAY17

x
?
Solved

How do you erase the CRectTracker and its styles?

Posted on 2004-09-13
6
Medium Priority
?
440 Views
Last Modified: 2013-11-20
Hi. I have a view which contains multiple static fields.  When the user clicks on a static field, I add a CRectTracker over the static field.  If there is another mouse click outside of the control with the CRectTracker, I want to delete the rect tracker and erase all remnants of it.  I have tried simply deleting the rect tracker, redrawing the window, invalidating its rect, etc.  Here is what I've tried:

// try clearing it's style
tracker->m_nStyle &= ~CRectTracker::hatchInside;
tracker->m_nStyle &= ~CRectTracker::dottedLine;
tracker->m_nStyle &= ~CRectTracker::resizeOutside;

// try invalidating its rect
CRect rectTrue;
tracker->GetTrueRect(&rectTrue);
InvalidateRect(rectTrue, TRUE);

// try redrawing the window it was used for
CWnd *trackingWnd = tracker->GetTrackingWnd();
trackingWnd->RedrawWindow();

// now just try deleting it.
delete tracker;
tracker = NULL;

Unfortunatley, with all of this, I still end up with the outline of the tracker on the screen.  I don't want to redraw the entire view because there is too much screen flicker.  Anybody have any ideas?

Thanks!
0
Comment
Question by:mromeo
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 3
6 Comments
 
LVL 44

Expert Comment

by:AndyAinscow
ID: 12051708
I don't see what function you are actually using (Draw, TrackRubberBand..) to draw it in the first place.

One thing you could try is to use a TRACE to find out the co-ordinates when you start the track and when you use this code
tracker->GetTrueRect(&rectTrue);
InvalidateRect(rectTrue, TRUE);

You may have a mis-match of screen and client co-ordinates
0
 

Author Comment

by:mromeo
ID: 12054176
I use Draw to draw the tracker.
0
 

Author Comment

by:mromeo
ID: 12054243
Tried your TRACE suggestion.  The coordiantes are exactly the same.  The only thing that seems to get the tracker to erase is a call to RedrawWindow, which redraws the entire CView.
0
What does it mean to be "Always On"?

Is your cloud always on? With an Always On cloud you won't have to worry about downtime for maintenance or software application code updates, ensuring that your bottom line isn't affected.

 
LVL 44

Accepted Solution

by:
AndyAinscow earned 800 total points
ID: 12054375
give this a try


CRect rectTrue;
tracker->GetTrueRect(&rectTrue);

rectTrue.InflateRect(1, 1);   //make the rect a little bit larger
InvalidateRect(&rectTrue, TRUE);   //note the & - it wants a pointer to a rect

UpdateWindow();
0
 

Author Comment

by:mromeo
ID: 12054509
YESSSS!!  All it was was the rect param.  I failed to pass a pointer to the rect.  Sometimes the simplest things can make you crazy...Thanks for your help.
0
 
LVL 44

Expert Comment

by:AndyAinscow
ID: 12054590
Yr welcome.  (I'd not seen it either at first glance!)
0

Featured Post

Survive A High-Traffic Event with Percona

Your application or website rely on your database to deliver information about products and services to your customers. You can’t afford to have your database lose performance, lose availability or become unresponsive – even for just a few minutes.

Question has a verified solution.

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

Exception Handling is in the core of any application that is able to dignify its name. In this article, I'll guide you through the process of writing a DRY (Don't Repeat Yourself) Exception Handling mechanism, using Aspect Oriented Programming.
Have you tried to learn about Unicode, UTF-8, and multibyte text encoding and all the articles are just too "academic" or too technical? This article aims to make the whole topic easy for just about anyone to understand.
This video will show you how to get GIT to work in Eclipse.   It will walk you through how to install the EGit plugin in eclipse and how to checkout an existing repository.
Visualize your data even better in Access queries. Given a date and a value, this lesson shows how to compare that value with the previous value, calculate the difference, and display a circle if the value is the same, an up triangle if it increased…

715 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