Eclipse Community Forums: Standard Widget Toolkit (SWT) » Calculate with pixels of text widget

Help

Home

Home » Eclipse Projects » Standard Widget Toolkit (SWT) » Calculate with pixels of text widget

Show: Today's Messages :: Show Polls :: Message Navigator

Calculate with pixels of text widget [message #522217]

Sun, 21 March 2010 12:19

Kai Schlamp

Messages: 344
Registered: July 2009

Senior Member

Hello.

I want to calculate and set the width of a text widget.
I know that the widget can contain a maximum of 5 digits using a grid layout. So I want to use the width hint. But how could I calculate the correct pixel count?

Regards,
Kai

Report message to a moderator

Re: Calculate with pixels of text widget [message #522303 is a reply to message #522217]

Mon, 22 March 2010 08:33

Daniel KrÃ¼gler

Messages: 853
Registered: July 2009

Senior Member

On 21.03.2010 13:19, Kai Schlamp wrote:
> I want to calculate and set the width of a text widget.
> I know that the widget can contain a maximum of 5 digits using a grid
> layout. So I want to use the width hint. But how could I calculate the
> correct pixel count?

I think you may want to create a GC on the fly, call either of
stringExtent or textExtend (Note the differences in the
documentation) given a specific text and dispose the GC immediately
as in:

GC gc = new GC(control);
Point size = stringExtent("12345"); // or textExtent
your.widthHint = size.x;
gc.dispose();

Alternatively you can get a good estimate via the FontMetrics:

GC gc = new GC(control);
fontMetrics = gc.getFontMetrics();
gc.dispose();

and then compute (as the jface.Dialog function does)

public static int convertWidthInCharsToPixels(FontMetrics fontMetrics,
int chars) {
return fontMetrics.getAverageCharWidth() * chars;
}

HTH & Greetings from Bremen,

Daniel Krügler

Report message to a moderator

Previous Topic:	Embedding custom cocoa widgets in SWT
Next Topic:	Composite invisible?

Goto Forum:

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

]

Current Time: Fri Apr 19 04:23:29 GMT 2024

.:: Contact :: Home ::.

Breadcrumbs

Sign up to our Newsletter