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 How to suspend SetNavigator temporarily?

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T O P I C    R E V I E W
Uwe Posted - Oct 27 2012 : 12:15:54
I have two ImageEnVect's which are connected to each other via


ImageEnVect1.SetNavigator(ImageEnVect2, [ienoMOUSEWHEELZOOM, ienoMARKOUTER])


How can I temporarily suspend the connection between the two ImageEnVect's?

I tried

ImageEnVect1.SetNavigator(nil, [ienoMOUSEWHEELZOOM, ienoMARKOUTER])

but that doesn't seem to do the trick even though it compiles.


Thx
Uwe
2   L A T E S T    R E P L I E S    (Newest First)
Uwe Posted - Oct 28 2012 : 10:05:01
Hi William


EDIT:

Found the culprit! I have some custom code that scales the image to a certain percentage of the main ImageEnVect's size before displaying it. Even though this code is very fast and quite simple, the calculation of the new image size slows down the navigator significantly - almost to a point where it becomes unusable.

So, what have I learned from this? Do not use an image navigator unless the image is displayed at 100%.

Hope this helps someone in the future

Uwe
w2m Posted - Oct 27 2012 : 16:21:14
Just set Navigator to nil...ImageEnView1.SetNavigator(nil);
This works as expected in the ...Samples\Display\Navigator example.

procedure Tfmain.ToggleNavigator1Click(Sender: TObject);
begin
  if ToggleNavigator1.Checked = True then
  begin
    ImageEnView1.SetNavigator(fnav.ImageEnView1);
    fnav.ImageEnView1.SelectionOptions := fnav.ImageEnView1.SelectionOptions+[iesoMarkOuter];
  end
  else
  begin
    ImageEnView1.SetNavigator(nil);
  end;
end;

William Miller
Adirondack Software & Graphics
Email: w2m@frontiernet.net
EBook: http://www.imageen.com/ebook/
Apprehend: http://www.frontiernet.net/~w2m/index.html