Swing Hacks

182

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Chapter 5, Windows, Dialogs, and Frames

#35 Add Windows Resize Icons

HACK

Icon is pretty simple, and it has only three methods:

void paintIcon(Component c, Graphics g, int x, int y);

int getIconWidth( );

int getIconHeight( );

The getIconWidth( ) and getIconHeight( ) methods should be pretty easy to

implement—you just need the pixel size of your custom icons. The

paintIcon( ) method is where all the interesting stuff happens.

The Explorer Icon

Figure 5-4 shows a huge blowup of what we’ll call the Explorer icon.

At a glance, you can see the six squares in a triangular pattern with a subtle

white 3D effect on the squares. The easiest thing to handle is the size, so

start with that. This icon is 12 × 12 pixels (one square in Figure 5-4 equals

one pixel).

Figure 5-2. The Windows Explorer resize icon

Figure 5-3. The Windows MS Office resize icon

Add Windows Resize Icons #35

Chapter 5, Windows, Dialogs, and Frames

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183

HACK

Here are the width and height methods. Start by creating constants for

height and width, and write the getters:

private static final int WIDTH = 12;

private static final int HEIGHT = 12;

public int getIconHeight( ) {

return WIDTH;

}

public int getIconWidth( ) {

return HEIGHT;

}

To implement paintIcon( ), you’ll need to recreate this icon using the

graphic primitives provided by AWT. So, you ...