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Dr. Javier Gonzalez-Sanchez javiergs@calpoly.edu www.javiergs.info o ffi ce: 14 -227 CSC 305 Individual Software Design and Development Lecture 08. Listeners

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Previously

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JPanel 3

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Listeners

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Release 1. GUI 9

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Release 2. Action Listeners 11

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Release 3. Draw Area 13

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Release 4. Mouse Listeners 16

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MouseListener • public void mousePressed (MouseEvent e) {} • public void mouseClicked(MouseEvent e) { } • public void mouseRele a sed(MouseEvent e) { } • public void mouseEntered(MouseEvent e) { } • public void mouseExited(MouseEvent e) { } • public void mouseDr a gged(MouseEvent me) { } • public void mouseMoved(MouseEvent e) { } 18

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MouseMotionListener • public void mouseDr a gged(MouseEvent me) { } • public void mouseMoved(MouseEvent e) { } 19

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Release 5. Draw + Mouse 20

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Listeners 22 • ActionListener • actionPerformance(ActionEvent e) {} • addActionListener (this);

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One Last Thing

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How to show a Dialog Box? 24

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How to show a Dialog Box? 25 JOptionPane.showMessageDialog (this, "Hello, I am a dialog box!");

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Questions 26

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Lab.

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Let’s work Cre a te this GUI using J a v a : 1. Blue b a r a t the top with your n a me. 2. A grid a t the center. Use MouseListener to a llow the user to click on a squ a re a nd ch a nge the color to yellow 3. The f ive buttons on the bottom. Only “Cle a r" need to work. Ignore the others. 4. The gr a y-box over the grid with the sliders c a n be ignored. Do not a dd it a t this moment. 28

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Let’s work 29

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CSC 305 Individual Software Design and Development Javier Gonzalez-Sanchez, Ph.D. javiergs@calpoly.edu Summer 2024 Copyright. These slides can only be used as study material for the class CSC305 at Cal Poly. They cannot be distributed or used for another purpose.