Re: Swing uses bad features
"Andrey Kuznetsov" <spam0@imagero.com.invalid> wrote in message
news:e62504$k91$1@online.de...
One place that this causes problems is in a composite component.
Suppose my subclass of JPanel creates 5 other widgets.
Now suppose that I want to reset the background of all of these
components when the user invokes my setBackground() method.
So in my setBackground() i do this:
w1.setBackground(color);
w2.setBackground(color);
etc.
But my setBackground() method gets called by JPanel's
constructor BEFORE my constructor has created any of these widgets!
if you want your 5 widgets to have same background as JPanel,
then set their background to null (for AWT) or make them not opaque (for
swing).
Otherwise in setBackground check if your widgets are not null.
What if he wants the background of his subclass to be transparent, but
the 5 widgets to be opaque?
E.g., he has a widget shaped like:
---- ----
| | | |
| |-----| |
| |
----| |----
| |
----| |----
| |
| |-----| |
| | | |
---- ----
- Oliver