?
Solved

How can I find the necessary height of a TLabel?

Posted on 1998-06-27
2
Medium Priority
?
231 Views
Last Modified: 2010-08-05
I am using a TLabel component with WordWrap=True and AutoSize=False.  (Screen space is limited).  The label is Red.  Since the text in the box can be different things, the actual number of lines of text changes.  What happens now is that sometimes the box is not full and so there is a blank line of red where there could have been extra text.  What I want to be able to do is find out how much space (or how many lines) the text occupies so I can change the Label.Height property so that blank red area is hidden.

I have been looking at the StdCtrls.Pas library code file and put together some code like this:

  with Label1.Canvas do
    begin
      Font := Label1.Font;
      H := TextHeight('0');
      StrPCopy(C, Label1.Caption);
      CLen := StrLen(C);
      R := Rect(8, 0, 0, H);
      DrawText(Label1.Canvas.Handle, C, CLen, R, DT_CalcRect Or DT_WORDBREAK or DT_LEFT);
    end;

As I understand it, it is SUPPOSED to return the size of the area needed in R but I'm getting some other data.  Any ideas???

Thanks!
/MP
0
Comment
Question by:mikepj
2 Comments
 
LVL 3

Accepted Solution

by:
AndreasSchindler earned 600 total points
ID: 1356075
const
  Alignments: array[TAlignment] of Word = (DT_LEFT, DT_RIGHT, DT_CENTER);
  WordWraps: array[Boolean] of Word = (0, DT_WORDBREAK);

var rect:TRect;
    Text:String;
    Drawstyle:Integer;
    h:Integer;
begin
    Rect := Label1.ClientRect;
    Text:=LAbel1.Caption;
    DrawStyle := DT_EXPANDTABS or WordWraps[LAbel1.WordWrap] or Alignments[LAbel1.Alignment];
    h:=DrawText(LAbel1.Canvas.Handle, PChar(Text), Length(Text), Rect, DrawStyle or DT_CALCRECT);
    LAbel1.height:=h;
end;

0
 
LVL 2

Author Comment

by:mikepj
ID: 1356076
Thank you Andreas,

After a bit of work I got the following to work...  (There was something wrong with the DrawStyle arrays and I don't need them so I took them out).

Thank you for your help; the code works great!
/MP

var
  A: array[0..100] of Char;
  rect:TRect;
  Text:String;
  Drawstyle:Integer;
  h:Integer;
begin
  Label1.Caption:=Memo1.Lines[0];
  Rect := Label1.ClientRect;
  Text:=LAbel1.Caption;
  StrPCopy(A, Text);
  DrawStyle := DT_EXPANDTABS or DT_WordBreak Or DT_Left;
  h:=DrawText(LAbel1.Canvas.Handle, A, Length(Text), Rect, DrawStyle or DT_CALCRECT);
  LAbel1.height:=h;
end;

0

Featured Post

Free Tool: Site Down Detector

Helpful to verify reports of your own downtime, or to double check a downed website you are trying to access.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

Objective: - This article will help user in how to convert their numeric value become words. How to use 1. You can copy this code in your Unit as function 2. than you can perform your function by type this code The Code   (CODE) The Im…
Creating an auto free TStringList The TStringList is a basic and frequently used object in Delphi. On many occasions, you may want to create a temporary list, process some items in the list and be done with the list. In such cases, you have to…
Through the video, you can check the migration process of Outlook PST file to PDF. Kernel for Outlook to PDF tool can convert Outlook emails with all attributes like Subject, To, From, Cc, Bcc and other folders such as Inbox, Outbox, Sent Items, Jun…
Watch the video to know the simple way to remove or recover or reset lost or forgotten passwords of Outlook PST file. With Kernel Outlook Password Recovery tool such operation is very easy to perform. It is a freeware with limitation to use with 500…

584 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