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To use paint or paintComp

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  To use paint or paintComp "travel2light" <travel2light@THRWHITE.remove-dii-this> - 2011-04-27 15:43 +0000
    Re: To use paint or paint "Jeff Higgins" <jeff.higgins@THRWHITE.remove-dii-this> - 2011-04-27 15:43 +0000
    Re: To use paint or paint "Roedy Green" <roedy.green@THRWHITE.remove-dii-this> - 2011-04-27 15:43 +0000
      Re: To use paint or paint "Daniel Pitts" <daniel.pitts@THRWHITE.remove-dii-this> - 2011-04-27 15:44 +0000

#3276 — To use paint or paintComp

  To: comp.lang.java.gui
Which is the right one to use for Swing components? I have always used
JPanels with a method paint(Graphics g) and then just called that
method using 'repaint()'. But after reading some of the discussions
here I found out that the correct way to go is to use
paintComponent(Graphics g). Why is this? What is the difference
between the two methods? Thanks for any advice.

Michael

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#3277 — Re: To use paint or paint

  To: comp.lang.java.gui

travel2light wrote:
> Which is the right one to use for Swing components? I have always used
> JPanels with a method paint(Graphics g) and then just called that
> method using 'repaint()'. But after reading some of the discussions
> here I found out that the correct way to go is to use
> paintComponent(Graphics g). Why is this? What is the difference
> between the two methods? Thanks for any advice.
>
> Michael

<http://java.sun.com/products/jfc/tsc/articles/painting/index.html#callbacks>
<http://java.sun.com/products/jfc/tsc/articles/painting/index.html>

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#3278 — Re: To use paint or paint

  To: comp.lang.java.gui
On Sat, 15 Mar 2008 13:44:34 -0700 (PDT), travel2light
<everything2light@yahoo.co.uk> wrote, quoted or indirectly quoted
someone who said :

>Which is the right one to use for Swing components? I have always used
>JPanels with a method paint(Graphics g) and then just called that
>method using 'repaint()'. But after reading some of the discussions
>here I found out that the correct way to go is to use
>paintComponent(Graphics g). Why is this? What is the difference
>between the two methods? Thanks for any advice.

See http://mindprod.com/jgloss/paintcomponent.html
http://mindprod.com/jgloss/paint.html

Yes, you should use paintComponent.  calling super.paintComponent and
using setOpaque replaces the old update/paint mechanism.

You can trace the calls or look at the code in source.zip, but when I
did that, I could not understand what the new scheme bought them.
I just use it.  
-- 

Roedy Green Canadian Mind Products
The Java Glossary
http://mindprod.com

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#3333 — Re: To use paint or paint

  To: comp.lang.java.gui
Roedy Green wrote:
> On Sat, 15 Mar 2008 13:44:34 -0700 (PDT), travel2light
> <everything2light@yahoo.co.uk> wrote, quoted or indirectly quoted
> someone who said :
> 
>> Which is the right one to use for Swing components? I have always used
>> JPanels with a method paint(Graphics g) and then just called that
>> method using 'repaint()'. But after reading some of the discussions
>> here I found out that the correct way to go is to use
>> paintComponent(Graphics g). Why is this? What is the difference
>> between the two methods? Thanks for any advice.
> 
> See http://mindprod.com/jgloss/paintcomponent.html
> http://mindprod.com/jgloss/paint.html
> 
> Yes, you should use paintComponent.  calling super.paintComponent and
> using setOpaque replaces the old update/paint mechanism.
> 
> You can trace the calls or look at the code in source.zip, but when I
> did that, I could not understand what the new scheme bought them.
> I just use it.  

paint in JComponent is designed to call  paintComponent and paintBorder, 
and handle delegation to the PLAF, as well as handle double buffering.

If you override "paint" you basically create a "heavy-weight" AWT 
component rather than a "light-weight" Swing component.


-- 
Daniel Pitts' Tech Blog: <http://virtualinfinity.net/wordpress/>

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