Bug 4132 - Monotouch.Dialog MultilineElement Cutting Off Last Line
Summary: Monotouch.Dialog MultilineElement Cutting Off Last Line
Status: RESOLVED DUPLICATE of bug 3529
Alias: None
Product: iOS
Classification: Xamarin
Component: Xamarin.iOS.dll ()
Version: 5.2
Hardware: PC Mac OS
: --- normal
Target Milestone: Untriaged
Assignee: Bugzilla
Depends on:
Reported: 2012-03-28 15:12 UTC by Justin Hansen
Modified: 2012-03-29 10:32 UTC (History)
3 users (show)

Is this bug a regression?: ---
Last known good build:

Text that is read into StreamReader. (878 bytes, text/plain)
2012-03-28 15:12 UTC, Justin Hansen

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Description Justin Hansen 2012-03-28 15:12:57 UTC
Created attachment 1593 [details]
Text that is read into StreamReader.

When I read in a text document and display the content in a MultilineElement it cuts off the last line.

  sr = new StreamReader("Terms.txt");
  string termText = sr.ReadToEnd();
  RootElement terms = new RootElement("Terms and Conditions");
  Section termSection = new Section(String.Empty);
  MultilineElement element = new MultilineElement(termText);

The text file is attached.
Comment 1 Justin Hansen 2012-03-28 15:19:57 UTC
I am not sure about the exact version number of Monotouch but I know it is the latest stable release.
Comment 2 Sebastien Pouliot 2012-03-28 15:50:13 UTC
FYI the MonoTouch version number is shown in MonoDevelop "Application Output" pad on each build. 

You can also get it (along with the build #) from the terminal using the following command.

    /Developer/MonoTouch/usr/bin/mtouch --version

Finally the most useful is to get it from "MonoDevelop" menu, "About MonoDevelop" item, "Version Info" tab and copy/paste the version informations (at least down to the "Loaded assemblies" section).
Comment 3 Justin Hansen 2012-03-28 15:52:29 UTC
The version is 5.2.10, thanks.
Comment 4 Sebastien Pouliot 2012-03-28 16:37:05 UTC
There's something wrong with the multi-line computations.

The two last words "written permission." are cut from the element when executed on an iPod/iPhone.

However the element is twice the required height when executed on an iPad.
Comment 5 Sebastien Pouliot 2012-03-28 16:57:03 UTC
The issue (for iPod/iPhone) seems to be that the size computation uses "Helvetica" 17.0 for font while the TextLabel.Font is using "Helvetica-Bold" 17.0. Changing the computation to Bold fix the issue (at least for this case).
Comment 6 Sebastien Pouliot 2012-03-28 17:15:40 UTC
The width is hardcoded to 280 pixels when calculating :-) so this expand the height by about 2. I'll cook a patch for both cases later (after diner :-)

Thanks for the report!
Comment 7 Sebastien Pouliot 2012-03-28 19:03:09 UTC
This fix the font (calculated versus rendered), margin difference (iPad versus iPhone) and orientation issues I found.

diff --git a/MonoTouch.Dialog/Elements.cs b/MonoTouch.Dialog/Elements.cs
index ee30808..c6dd278 100644
--- a/MonoTouch.Dialog/Elements.cs
+++ b/MonoTouch.Dialog/Elements.cs
@@ -1017,8 +1017,9 @@ namespace MonoTouch.Dialog
                public virtual float GetHeight (UITableView tableView, NSIndexPath indexPath)
-                       SizeF size = new SizeF (280, float.MaxValue);
-                       using (var font = UIFont.FromName ("Helvetica", 17f))
+                       float margin = UIDevice.CurrentDevice.UserInterfaceIdiom == UIUserInterfaceIdiom.Phone ? 40f : 110f;
+                       SizeF size = new SizeF (tableView.Bounds.Width - margin, float.MaxValue);
+                       using (var font = UIFont.FromName ("Helvetica-Bold", 17f))
                                return tableView.StringSize (Caption, font, size, UILineBreakMode.WordWrap).Height + 10;
Comment 8 Sebastien Pouliot 2012-03-28 20:41:45 UTC
The patch from bug #3529 is a superset of this one.
c.c. Miguel
Comment 9 Justin Hansen 2012-03-28 21:00:17 UTC
I'm currently using the built in Monotouch.Dialog library, do I now need to use the outside one to implement this patch? If not how do I incorporate it?
Comment 10 Sebastien Pouliot 2012-03-29 10:32:41 UTC
Fixed with the patch from bug #3529

Justin, you can either:

a) update to MonoTouch 5.2.11 (stable) when available (or 5.3.3 unstable);

b) use the MT.D code from GIT (the patch for #3529 is already there, 03966b49606e7f1a3cc6a4e8f97c7ba12f5e160c); or 

c) you can create your own, e.g. MyMultilineElement, and override GetHeight to use the code from comment #7.

*** This bug has been marked as a duplicate of bug 3529 ***