/* * Copyright (c) 2000 David Flanagan.  All rights reserved. * This code is from the book Java Examples in a Nutshell, 2nd Edition. * It is provided AS-IS, WITHOUT ANY WARRANTY either expressed or implied. * You may study, use, and modify it for any non-commercial purpose. * You may distribute it non-commercially as long as you retain this notice. * For a commercial use license, or to purchase the book (recommended), * visit http://www.davidflanagan.com/javaexamples2. */package com.davidflanagan.examples.gui;import java.awt.*;import java.awt.event.*;import javax.swing.*;import javax.swing.event.*;import com.davidflanagan.examples.gui.ItemChooser;/** * This is a JDialog subclass that allows the user to select a font, in any * style and size, from the list of available fonts on the system.  The  * dialog is modal. Display it with show(); this method does not return * until the user dismisses the dialog.  When show() returns, call  * getSelectedFont() to obtain the user's selection.  If the user clicked the * dialog's "Cancel" button, getSelectedFont() will return null. **/public class FontChooser extends JDialog {    // These fields define the component properties    String family;           // The name of the font family    int style;               // The font style    int size;                // The font size    Font selectedFont;       // The Font they correspond to    // This is the list of all font families on the system    String[] fontFamilies;    // The various Swing components used in the dialog    ItemChooser families, styles, sizes;    JTextArea preview;    JButton okay, cancel;    // The names to appear in the "Style" menu    static final String[] styleNames = new String[] {	"Plain", "Italic", "Bold", "BoldItalic"    };    // The style values that correspond to those names    static final Integer[] styleValues = new Integer[] {	new Integer(Font.PLAIN), new Integer(Font.ITALIC),	new Integer(Font.BOLD), new Integer(Font.BOLD+Font.ITALIC)    };    // The size "names" to appear in the size menu    static final String[] sizeNames = new String[] {	"8", "10", "12", "14", "18", "20", "24", "28", "32", 	"40", "48", "56", "64", "72"    };    // This is the default preview string displayed in the dialog box    static final String defaultPreviewString = 	"ABCDEFGHIJKLMNOPQRSTUVWXYZ\n" + 	"abcdefghijklmnopqrstuvwxyz\n" + 	"1234567890!@#$%^&*()_-=+[]{}<,.>\n" +	"The quick brown fox jumps over the lazy dog";    /** Create a font chooser dialog for the specified frame. */    public FontChooser(Frame owner) {	super(owner, "Choose a Font");  // Set dialog frame and title	// This dialog must be used as a modal dialog.  In order to be used	// as a modeless dialog, it would have to fire a PropertyChangeEvent	// whenever the selected font changed, so that applications could be 	// notified of the user's selections.	setModal(true);		// Figure out what fonts are available on the system	GraphicsEnvironment env =	    GraphicsEnvironment.getLocalGraphicsEnvironment();	fontFamilies = env.getAvailableFontFamilyNames();	// Set initial values for the properties	family = fontFamilies[0];	style = Font.PLAIN;	size = 18;	selectedFont = new Font(family, style, size);	// Create ItemChooser objects that allow the user to select font	// family, style, and size.	families = new ItemChooser("Family", fontFamilies, null, 0,				   ItemChooser.COMBOBOX);	styles = new ItemChooser("Style", styleNames, styleValues, 0,				 ItemChooser.COMBOBOX);	sizes = new ItemChooser("Size", sizeNames,null,4,ItemChooser.COMBOBOX);	// Now register event listeners to handle selections	families.addItemChooserListener(new ItemChooser.Listener() {		public void itemChosen(ItemChooser.Event e) {		    setFontFamily((String)e.getSelectedValue());		}	    });	styles.addItemChooserListener(new ItemChooser.Listener() {		public void itemChosen(ItemChooser.Event e) {		    setFontStyle(((Integer)e.getSelectedValue()).intValue());		}	    });	sizes.addItemChooserListener(new ItemChooser.Listener() {		public void itemChosen(ItemChooser.Event e) {		   setFontSize(Integer.parseInt((String)e.getSelectedValue()));		}	    });	// Create a component to preview the font.	preview = new JTextArea(defaultPreviewString, 5, 40);	preview.setFont(selectedFont);	// Create buttons to dismiss the dialog, and set handlers on them	okay = new JButton("Okay");	cancel = new JButton("Cancel");	okay.addActionListener(new ActionListener() {		public void actionPerformed(ActionEvent e) { hide(); }	    });	cancel.addActionListener(new ActionListener() {		public void actionPerformed(ActionEvent e) {		    selectedFont = null;		    hide();		}	    });		// Put the ItemChoosers in a Box 	Box choosersBox = Box.createHorizontalBox();	choosersBox.add(Box.createHorizontalStrut(15));	choosersBox.add(families);	choosersBox.add(Box.createHorizontalStrut(15));	choosersBox.add(styles);	choosersBox.add(Box.createHorizontalStrut(15));	choosersBox.add(sizes);	choosersBox.add(Box.createHorizontalStrut(15));	choosersBox.add(Box.createGlue());	// Put the dismiss buttons in another box	Box buttonBox = Box.createHorizontalBox();	buttonBox.add(Box.createGlue());	buttonBox.add(okay);	buttonBox.add(Box.createGlue());	buttonBox.add(cancel);	buttonBox.add(Box.createGlue());	// Put the choosers at the top, the buttons at the bottom, and	// the preview in the middle.	Container contentPane = getContentPane();	contentPane.add(new JScrollPane(preview), BorderLayout.CENTER);	contentPane.add(choosersBox, BorderLayout.NORTH);	contentPane.add(buttonBox, BorderLayout.SOUTH);	// Set the dialog size based on the component size.	pack();    }    /**     * Call this method after show() to obtain the user's selection.  If the     * user used the "Cancel" button, this will return null     **/    public Font getSelectedFont() { return selectedFont; }    // These are other property getter methods    public String getFontFamily() { return family; }    public int getFontStyle() { return style; }    public int getFontSize() { return size; }    // The property setter methods are a little more complicated.    // Note that none of these setter methods update the corresponding    // ItemChooser components as they ought to.    public void setFontFamily(String name) { 	family = name; 	changeFont();    }    public void setFontStyle(int style) {	this.style = style;	changeFont();    }    public void setFontSize(int size) {	this.size = size;	changeFont();    }    public void setSelectedFont(Font font) {	selectedFont = font;	family = font.getFamily();	style = font.getStyle();	size = font.getSize();	preview.setFont(font);    }    // This method is called when the family, style, or size changes    protected void changeFont() {	selectedFont = new Font(family, style, size);	preview.setFont(selectedFont);    }    // Override this inherited method to prevent anyone from making us modeless    public boolean isModal() { return true; }    /** This inner class demonstrates the use of FontChooser */    public static class Demo {	public static void main(String[] args) {	    // Create some components and a FontChooser dialog	    final JFrame frame = new JFrame("demo");	    final JButton button = new JButton("Push Me!");	    final FontChooser chooser = new FontChooser(frame);	    	    // Handle button clicks	    button.addActionListener(new ActionListener() {		    public void actionPerformed(ActionEvent e) {			// Pop up the dialog			chooser.show();			// Get the user's selection			Font font = chooser.getSelectedFont();			// If not cancelled, set the button font			if (font != null) button.setFont(font);		    }		});	    	    // Display the demo	    frame.getContentPane().add(button);	    frame.setSize(200, 100);	    frame.show();	}    }}