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WDD_lec_18 - Web Design Development Lecture 18 Java...

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Web Design & Development Lecture 18
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Java Graphics
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Graphics Window is like a painter’s canvas App must paint its window contents Java components paint themselves Anything else: Programmer When to paint? How to paint? JButton
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MyApp
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Open WinExp, Notepad
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Close WinExplorer Repaint event sent to: MyApp, Desktop
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Desktop gets repaint event
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MyApp gets repaint event MyApp JPanel gets repaint event
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MyApp gets repaint event MyApp JPanel forwards repaint event to JButton
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Painting a Swing Component Three methods are at the heart of painting a swing component paintComponent() paintBorder() paintChildren()
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The Swing Painting Methods It's one of three methods, that objects of type JComponent use to paint themselves. The three methods are invoked in this order: paintComponent — The main method for painting. By default, it first paints the background. Then it performs any custom painting.
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