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Groups > comp.lang.java.programmer > #38321
| From | Eric Sosman <esosman@comcast-dot-net.invalid> |
|---|---|
| Newsgroups | comp.lang.java.programmer |
| Subject | Re: Is there a method to update control size? |
| Date | 2018-05-31 15:55 -0400 |
| Organization | A noiseless patient Spider |
| Message-ID | <pepk05$8ku$1@dont-email.me> (permalink) |
| References | <7a7e726d-051d-4f17-93ac-3dabdde80894@googlegroups.com> <pep4b3$qnp$1@dont-email.me> <959c54c7-9fb9-4bba-93c9-6983553999bf@googlegroups.com> |
On 5/31/2018 12:42 PM, Eric Douglas wrote:
> On Thursday, May 31, 2018 at 11:28:43 AM UTC-4, Eric Sosman wrote:
>> On 5/31/2018 10:34 AM, Eric Douglas wrote:
>>> I create a JLabel. I create a JScrollPane. I call setLayout(new GridLayout()) on the JLabel, then add the JScrollPane to the JLabel.
>>
>> Right here is where I simply must ask: "Why?" Why not just put
>> the scroll pane wherever you were going to put the label? (Or, why
>> not put the label-plus-scroll as the content of another label, and
>> put that as the content of yet another label, and ...?)
>>
> Because the JLabel is a custom class which wraps every control type, which gives them all a common border, which turns blue if they have focus. This also makes each control a single control where they may otherwise be multiple controls. ie a US phone number control has an area code input, a prefix input, a suffix input, and text labels to show the ( ) - mask. One border shows around all of them. Putting a single control like this JScrollPane in such a JPanel is to avoid duplicating logic like the border objects and focus listeners.
Even without the customized JLabel (aside: Why call all your
classes "custom" classes?), there's no need to duplicate the focus
management logic, the border-changing, or the border objects. You
can attach one focus listener to as many components as you like.
--
esosman@comcast-dot-net.invalid
Nine hundred sixty-five days to go.
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Is there a method to update control size? Eric Douglas <e.d.programmer@gmail.com> - 2018-05-31 07:34 -0700
Re: Is there a method to update control size? Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2018-05-31 17:20 +0200
Re: Is there a method to update control size? Eric Sosman <esosman@comcast-dot-net.invalid> - 2018-05-31 11:28 -0400
Re: Is there a method to update control size? Eric Douglas <e.d.programmer@gmail.com> - 2018-05-31 09:42 -0700
Re: Is there a method to update control size? Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2018-05-31 19:22 +0200
Re: Is there a method to update control size? Eric Douglas <e.d.programmer@gmail.com> - 2018-05-31 10:38 -0700
Re: Is there a method to update control size? Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2018-05-31 19:45 +0200
Re: Is there a method to update control size? Eric Douglas <e.d.programmer@gmail.com> - 2018-05-31 10:55 -0700
Re: Is there a method to update control size? Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2018-05-31 20:05 +0200
Re: Is there a method to update control size? Knute Johnson <nospam@rabbitbrush.frazmtn.com> - 2018-06-03 15:00 -0500
Re: Is there a method to update control size? Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2018-06-04 02:25 +0200
Re: Is there a method to update control size? Eric Sosman <esosman@comcast-dot-net.invalid> - 2018-05-31 15:55 -0400
Re: Is there a method to update control size? Knute Johnson <nospam@rabbitbrush.frazmtn.com> - 2018-06-03 15:02 -0500
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