Java Reference
In-Depth Information
int fontStyle = font.getStyle();
if(e.getStateChange()==ItemEvent.SELECTED) { // If style was selected
fontStyle |= style;
// turn it on in the font style
} else {
fontStyle &= ~style;
// otherwise turn it off
}
font = font.deriveFont(fontStyle);
// Get a new font
fontDisplay.setFont(font);
// Change the label font
fontDisplay.repaint();
// repaint
}
private int style;
// Style for this listener
}
Directory "Sketcher 5 displaying a font dialog"
The constructor accepts an argument that is the style for the button, so the value of the member,
style
,
is the value you want to set in the
fontStyle
member that you use to create a new
Font
object, either
Font.BOLD
or
Font.ITALIC
. You initialize the
fontStyle
variable with the current font style. Because the
listener for a particular button already contains the corresponding style, the
itemStateChanged()
method
that is called when an item event occurs just switches the value of
style
in
fontStyle
either on or off,
depending on whether the radio button was selected or deselected. It then derives a font with the new style,
sets it in the
fontDisplay
label, and repaints the label.
You have now completed the
FontDialog
class. If you have been creating the code yourself, now would
be a good time to try compiling the class to see what is missing —
import
statements, usually. All you need
now is some code in the
SketcherFrame
class to make use of it.
TRY IT OUT: Using the Font Dialog
To get the font dialog operational in Sketcher, you can add an Options menu to the menu bar with a
Choose font . . . menu item, and install a listener for the menu item. First, add
SketcherFrame
members
to store the
JMenu
object for the Options menu and an instance of the font dialog:
private JMenu optionsMenu;
// Options menu
private FontDialog fontDlg;
// The font
dialog
You can also add a member to store the menu item in the Options menu:
private JMenuItem fontItem;
// Font chooser
menu item
Now you can create the Options menu with the following code in the
SketcherFrame
constructor:
public SketcherFrame(String title, Sketcher theApp) {
setTitle(title); // Set the
window title
this.theApp = theApp; // Save
