[news.eclipse.platform.swt] Re: Dynamically resizing Text Control

["Steve Northover" <steve_northover@xxxxxxxxxx>]

http://dev.eclipse.org/viewcvs/index.cgi/%7Echeckout%7E/platform-swt-home/sn
ippits/snippet111.html

"Ash" <ash@xxxxxxxxxxxxxxx> wrote in message
news:b7mvm9$pac$1@xxxxxxxxxxxxxxxx
> Its great to finally see a newsgroup dedicated to SWT! I am trying to
> dynamically resize a Text control based on its contents. I basically added
> a modify listener which calls pack() to recompute the preferred size of
> the control each time it is modified. The problem I have is after I type
> the first character, the control resizes but shifts my contents to the
> left. It seems like the preferred size always needs some extra buffer
> space at the end.
>
> The code snippet I used is shown below. I can get the desired effect by
> uncommenting the kludge code but I'd like to find a better way if
possible.
>
> import org.eclipse.swt.SWT;
> import org.eclipse.swt.events.ModifyEvent;
> import org.eclipse.swt.events.ModifyListener;
> import org.eclipse.swt.graphics.FontMetrics;
> import org.eclipse.swt.graphics.GC;
> import org.eclipse.swt.widgets.Display;
> import org.eclipse.swt.widgets.Shell;
> import org.eclipse.swt.widgets.Text;
>
> public class Name {
>   public static void main(String[] args) {
>     Display display = new Display();
>     final Shell shell = new Shell(display);
>     final Text firstname = new Text(shell, SWT.BORDER);
>     firstname.setText("");
>     firstname.setSize(firstname.computeSize(SWT.DEFAULT, SWT.DEFAULT));
>     firstname.setTextLimit(15);
>     firstname.addModifyListener(new ModifyListener() {
>       public void modifyText(ModifyEvent e) {
>         firstname.pack(true);
>
>          /* Kludge
>         int columns = firstname.getText().length() + 3;
>         GC gc = new GC (firstname);
>         FontMetrics fm = gc.getFontMetrics ();
>         int width = columns * fm.getAverageCharWidth ();
>         int height = fm.getHeight ();
>         gc.dispose ();
>         firstname.setSize (firstname.computeSize (width, height));
>         */
>       }
>     });
>
>     shell.pack();
>     shell.open();
>     while (!shell.isDisposed()) {
>       if (!display.readAndDispatch())
>       display.sleep();
>     }
>     display.dispose();
>   }
> }
>
> Ash
>