Comments on Mobile PractiCEs: Multi-line Graphics.MeasureString implementation o...

Thank you! Thank you! Thank you!!!

2011-03-15T17:50:55.726-03:00

Thank you! Thank you! Thank you!!!

Amigo, excelente post. Me salvaste la vida en cue...

2010-06-15T23:08:58.557-03:00

Amigo, excelente post. Me salvaste la vida en cuestion de minutos!! Un abrazo desde Venezuela.

Thanks José, really helped me get past the block. ...

2010-05-11T16:30:05.952-03:00

Thanks José, really helped me get past the block.

archimed7592's suggestion for different font handling was very helpful

It's perfect and very helpful. Thank you.

2010-01-29T06:32:12.912-03:00

It's perfect and very helpful. Thank you.

Got a little problem, VS2008 can´t find the coredl...

2010-01-25T13:16:08.631-03:00

Got a little problem, VS2008 can´t find the coredll.dll.

Where can I get this file for Compact Framework 3.5?

Thanks so much for this post! I've been bangin...

2010-01-25T11:49:04.045-03:00

Thanks so much for this post! I've been banging my head off my desk for 4 days trying to figure out how to do this! EXACTLY what I needed!

> Nabs said... > A rather crude implementati...

2009-09-16T10:11:19.238-03:00

> Nabs said...
> A rather crude implementation

Nabs, your implementation doesn't take into account word wrapping. This implementation could produce label with clipped lines or with empty ones.

Original implementation in such cases works just great, you only have to consider label's internal padding.

A rather crude implementation (that I have not ext...

2009-09-16T06:44:22.571-03:00

A rather crude implementation (that I have not extensively tested in all scenarios) would be to use MeasureString and divide the returned width with the holding container's width, e.g:

string thetext; //Text string
Font font; //Font to be used
Graphics g = this.CreateGraphics();
SizeF s = g.MeasureString(thetext, font);
int numlines = ((int)s.Width / labelDesc.Width) + 1;
labelDesc.Height = (int)s.Height * numlines;

This gives a rather tight fit so its probably worth experimenting with adding an extra 6pts as suggested in the original article.

Thanks, Jose!

I've slightly modified it...

2009-03-16T19:30:00.000-03:00

Thanks, Jose!

I've slightly modified it to take into account different fonts.

Mainly the difference is concentrated in these four lines:

var hFont = label.Font.ToHfont();
var oldHFont = Api.SelectObject(hDc, hFont);
// ...
Api.SelectObject(hDc, oldHFont);
Api.DeleteObject(hFont);

Full code:

public static class LabelHelper
{
public static int TextHeightForWidth(this Label label, Graphics g, string text)
{
var bounds = new Api.Rect(label.ClientRectangle);

var hDc = g.GetHdc();

var hFont = label.Font.ToHfont();

var oldHFont = Api.SelectObject(hDc, hFont);

var flags = Api.DT_CALCRECT | Api.DT_WORDBREAK;

Api.DrawText(hDc, text, text.Length, ref bounds, flags);

Api.SelectObject(hDc, oldHFont);

Api.DeleteObject(hFont);

g.ReleaseHdc(hDc);

return bounds.Bottom - bounds.Top;
}

public static int TextHeightForWidth(this Label label, Graphics g)
{
return label.TextHeightForWidth(g, label.Text);
}

public static int TextHeightForWidth(this Label label, string text)
{
Control ctrl = label;
while (!(ctrl is Form) && ctrl != null)
ctrl = label.Parent;

if (ctrl == null)
throw new NotSupportedException("Can't create graphics for label outside a form");

var form = (Form) ctrl;
using (var g = form.CreateGraphics())
return label.TextHeightForWidth(g, text);
}

public static int TextHeightForWidth(this Label label)
{
return label.TextHeightForWidth(label.Text);
}

internal static class Api
{

[StructLayout(LayoutKind.Sequential)]
public struct Rect
{
public int Left;
public int Top;
public int Right;
public int Bottom;

public Rect(Rectangle r)
{
Left = r.Left;
Top = r.Top;
Bottom = r.Bottom;
Right = r.Right;
}
}

public const int DT_CALCRECT = 0x00000400;
public const int DT_WORDBREAK = 0x00000010;

[DllImport("coredll.dll")]
public static extern int DrawText(IntPtr hdc, string lpStr, int nCount, ref Rect lpRect, int wFormat);

[DllImport("coredll.dll")]
public static extern IntPtr SelectObject(IntPtr hdc, IntPtr obj);

[DllImport("coredll.dll")]
public static extern int DeleteObject(IntPtr obj);
}
}

It can be used in several ways:

label.Height = label.TextWidthForHeight();

label.Height = label.TextWidthForHeight("some text to measure");

using(var g = this.CreateGraphics())
label.Height = label.TextWidthForHeight(g, "some text to measure");

// ... and so on

Hope that will help somebody.

You're right, it was a copy/paste issue with the b...

2009-02-16T10:37:00.000-02:00

You're right, it was a copy/paste issue with the blogger editor. I fix it with WLW and it looks fine now. Thanks for the catch!

There are two typos in the code, probably due to e...

2009-02-16T02:34:00.000-02:00

There are two typos in the code, probably due to erroneous copy & paste:

int flags = DT_CALCRECT|DT_WORDBREAK;
if (textboxControl) flags |= DT_EDITCONTROL;

The OR calculation "|" was missing. The first typos result in a compilation error whereas the second typo result in wrong calculation.

I am in head each with this problem.
Thank you...

2009-02-12T01:54:00.000-02:00

I am in head each with this problem.
Thank you so much.

Realy appreciate. With love from Russia.

2009-01-28T17:55:00.000-02:00

Realy appreciate. With love from Russia.

Perfect! Just what I was looking for. Thanks for...

2008-12-10T17:04:00.000-02:00

Perfect! Just what I was looking for. Thanks for posting!!!

Extremely useful. Very nice bit of code. Thanks ...

2008-10-02T17:33:00.000-03:00

Extremely useful. Very nice bit of code. Thanks very much for posting.

Comments on Mobile PractiCEs: Multi-line Graphics.MeasureString implementation o...

Thank you! Thank you! Thank you!!!

Amigo, excelente post. Me salvaste la vida en cue...

Thanks José, really helped me get past the block. ...

It's perfect and very helpful. Thank you.

Got a little problem, VS2008 can´t find the coredl...

Thanks so much for this post! I've been bangin...

> Nabs said... > A rather crude implementati...

A rather crude implementation (that I have not ext...

Thanks, Jose!I've slightly modified it...

You're right, it was a copy/paste issue with the b...

There are two typos in the code, probably due to e...

I am in head each with this problem. Thank you...

Realy appreciate. With love from Russia.

Perfect! Just what I was looking for. Thanks for...

Extremely useful. Very nice bit of code. Thanks ...

Thanks, Jose!

I've slightly modified it...

I am in head each with this problem.
Thank you...