Re: [Jython-dev] Can't call paintComponent() from a JPanel derived class

[Oti <oh...@ya...>]

[ Byron Hammond ]

> I'm having some problems doing some graphics stuff at the moment.
> I just want to do some simple drawing inside a JPanel.
> 
> I derive my class from JPanel and override paintComponent(Graphics g)
> (as recommended by the Java swing tutorials) but I get an error
> message, now matter how I try to do it.
> 
> I realize JPanel only inherits paintComponent from JComponent, but as
> I said, it doesn't matter what I do...
> Any help is appreciated.
> 
> class a(JPanel):
> 	paintComponent(self, Graphics):
> 		JPanel.paintComponent(self, Graphics)
> 		Graphics.drawRect(1, 1, 100, 100)
> 
> AttributeError: class 'javax.swing.JPanel' has no attribute
> 'paintComponent'
> 
> or...
> 
> class a(JPanel):
> 	paintComponent(self, Graphics):
> 		JComponent.paintComponent(self, Graphics)
> 		Graphics.drawRect(1, 1, 100, 100)
> 
> AttributeError: class 'javax.swing.JComponent' has no attribute
> 'paintComponent'

Byron,

since method paintComponent(Graphics) is protected on JComponent, use
the self.super__ syntax:

class a(JPanel):
  paintComponent(self, Graphics):
    self.super__paintComponent(Graphics)
    Graphics.drawRect(1, 1, 100, 100)

The syntax you suggested:
  JPanel.paintComponent(self, Graphics)
is for overriding public methods.

Hope this helps, and best wishes,
Oti.

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