Hi
I am facing a problem that after changing the title of a titled
border on a swing panel i am not being able to call the border's
paintBorder(...) function correctly. the border is on the panel and
panel.repaint() works perfectly fine but since i am just changing the title
of the border i don't want to repaint the whole panel. the problem is that
the graphics object being passed is null. i don't even know if i'm calling
the function correctly ! i am getting a NullPointerException.
i am calling the function as:
myBorder.paintBorder(panel, panel.getGraphics(), 0, 0, panel.getWidth(),
panel.getHeight()); // myBorder is attached to panel
and the stack trace is:
Exception occurred during event dispatching:
java.lang.NullPointerException
at java.awt.Rectangle.setBounds(Rectangle.java:251)
at javax.swing.border.TitledBorder.paintBorder(TitledBorder.java:329)
at myui.MyPanel$1.valueChanged(MyPanel.java:50)
at
javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionM
odel.java:170)
at
javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionM
odel.java:140)
at
javax.swing.DefaultListSelectionModel.setValueIsAdjusting(DefaultListSelecti
onModel.java:507)
at
javax.swing.plaf.basic.BasicTableUI$MouseInputHandler.setValueIsAdjusting(Ba
sicTableUI.java:443)
at
javax.swing.plaf.basic.BasicTableUI$MouseInputHandler.mouseReleased(BasicTab
leUI.java:486)
at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:231)
at java.awt.Component.processMouseEvent(Component.java:3717)
at java.awt.Component.processEvent(Component.java:3546)
at java.awt.Container.processEvent(Container.java:1164)
at java.awt.Component.dispatchEventImpl(Component.java:2595)
at java.awt.Container.dispatchEventImpl(Container.java:1213)
at java.awt.Component.dispatchEvent(Component.java:2499)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:2451)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:2216)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:2125)
at java.awt.Container.dispatchEventImpl(Container.java:1200)
at java.awt.Window.dispatchEventImpl(Window.java:912)
at java.awt.Component.dispatchEvent(Component.java:2499)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:319)
at java.awt.EventDispatchThread.pumpOneEvent(EventDispatchThread.java:103)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:84)
is there any way i can call this function successfully? or will i have to
use panel.repaint()?
thanks in advance,
jassi
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