通过选择框更改字体 [英] Changing fonts through a choice box
本文介绍了通过选择框更改字体的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
// Import Core Java packages
import java.awt.*;
import java.awt.event.*;
public class Welcome extends Frame {
// Constants and variables used in the program
static final int WIDTH = 500; // frame width
static final int HEIGHT = 450; // frame height
static final int SMALL_SIZE = 16; // small font size
static final int MEDIUM_SIZE = 20; // medium font size
static final int LARGE_SIZE = 24; // large font size
static final String COLOR_NAMES[] = {"Red", "Blue", "Green"};
static final Color COLORS[] = {Color.RED, Color.BLUE, Color.GREEN};
static final String INITIAL_FACE = "TimesRoman"; // initial typeface
static final int INITIAL_STYLE = Font.PLAIN; // initial type style
static final int INITIAL_SIZE = LARGE_SIZE; // initial type size
String typeFace = INITIAL_FACE; // current typeface
int typeStyle = INITIAL_STYLE; // current type style
int typeSize = INITIAL_SIZE; // current type size
Font TimesRoman = new Font ("TimesRoman", typeStyle, typeSize);
Font Courier = new Font ("Courier", typeStyle, typeSize);
Font Dialog = new Font ("Dialog", typeStyle, typeSize);
Label text; // display text
Checkbox small; // checkbox for small font
Checkbox medium; // checkbox for medium font
Checkbox large; // checkbox for large font
Checkbox plain;
Checkbox bold;
Checkbox italic;
Choice colorChoice; // choice box for text color
Choice faceFont;
Button resetButton; // button to reset font and color
Button exitButton;
/**
* Constructor
*/
public Welcome() {
setTitle("Welcome Java Program"); // set frame title
// create text
text = new Label("Welcome to the World of Java");
text.setAlignment(Label.CENTER);
text.setFont(new Font(typeFace, typeStyle, typeSize));
text.setForeground(COLORS[0]);
add(text, BorderLayout.CENTER);
Panel controlPanel = new Panel();
controlPanel.setLayout(new GridLayout(0, 1));
add(controlPanel, BorderLayout.SOUTH);
// create choice box
Panel panel = new Panel();
panel.setLayout(new FlowLayout(FlowLayout.LEFT));
controlPanel.add(panel);
Label label = new Label("Select a text color");
panel.add(label);
colorChoice = new Choice();
colorChoice.add(COLOR_NAMES[0]);
colorChoice.add(COLOR_NAMES[1]);
colorChoice.add(COLOR_NAMES[2]);
panel.add(colorChoice);
colorChoice.addItemListener(new ItemListener() {
public void itemStateChanged(ItemEvent event) {
text.setForeground(COLORS[colorChoice.getSelectedIndex()]);
}
});
Label label1 = new Label("Select a Font style");
panel.add(label1);
faceFont = new Choice();
faceFont.add(COLOR_NAMES[0]);
faceFont.add(COLOR_NAMES[1]);
faceFont.add(TimesRoman);
panel.add(faceFont);
faceFont.addItemListener(new ItemListener() {
public void itemStateChanged(ItemEvent event) {
text.setForeground(COLORS[colorChoice.getSelectedIndex()]);
}
});
// create radio buttons
panel = new Panel();
panel.setLayout(new FlowLayout(FlowLayout.LEFT));
controlPanel.add(panel);
label1 = new Label("Select a type size");
panel.add(label1);
CheckboxGroup sizeGroup = new CheckboxGroup();
small = new Checkbox("Small", sizeGroup, false);
panel.add(small);
small.addItemListener(new ItemListener() {
public void itemStateChanged(ItemEvent event) {
if(small.getState()) {
typeSize = SMALL_SIZE;
fontChange(typeFace, typeStyle, typeSize);
}
}
});
medium = new Checkbox("Medium", sizeGroup, true);
panel.add(medium);
medium.addItemListener(new ItemListener() {
public void itemStateChanged(ItemEvent event) {
if(medium.getState()) {
typeSize = MEDIUM_SIZE;
fontChange(typeFace, typeStyle, typeSize);
}
}
});
large = new Checkbox("Large", sizeGroup, false);
panel.add(large);
large.addItemListener(new ItemListener() {
public void itemStateChanged(ItemEvent event) {
if(large.getState()) {
typeSize = LARGE_SIZE;
fontChange(typeFace, typeStyle, typeSize);
}
}
});
panel = new Panel();
panel.setLayout(new FlowLayout(FlowLayout.LEFT));
controlPanel.add(panel);
label1 = new Label("Select a type style");
panel.add(label1);
CheckboxGroup styleGroup = new CheckboxGroup();
italic = new Checkbox("Italic", styleGroup, false);
panel.add(italic);
italic.addItemListener(new ItemListener() {
public void itemStateChanged(ItemEvent event) {
if(italic.getState()) {
typeStyle = Font.ITALIC ;
fontChange(typeFace, typeStyle, typeSize);
}
}
});
bold = new Checkbox("Bold", styleGroup, false);
panel.add(bold);
bold.addItemListener(new ItemListener() {
public void itemStateChanged(ItemEvent event) {
if(bold.getState()) {
typeStyle = Font.BOLD ;
fontChange(typeFace, typeStyle, typeSize);
}
}
});
plain = new Checkbox("Plain", styleGroup, true);
panel.add(plain);
plain.addItemListener(new ItemListener() {
public void itemStateChanged(ItemEvent event) {
if(plain.getState()) {
typeStyle = Font.PLAIN ;
fontChange(typeFace, typeStyle, typeSize);
}
}
});
// create reset button
panel = new Panel();
panel.setLayout(new FlowLayout(FlowLayout.CENTER));
controlPanel.add(panel);
resetButton = new Button("Reset");
panel.add(resetButton);
resetButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
large.setState(true); // reset radio button
colorChoice.select(0); // reset color choice box
text.setForeground(COLORS[0]); // reset text color
typeStyle = INITIAL_STYLE;
typeSize = INITIAL_SIZE; // reset type size
fontChange(typeFace, typeStyle, typeSize); // reset text font
}
});
exitButton = new Button("Exit");
panel.add(exitButton);
exitButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
System.exit(0);
}
});
} // end of constructor
/**
* Method to change the text font
*/
private void fontChange(String typeFace, int typeStyle, int typeSize) {
Font font = new Font(typeFace, typeStyle, typeSize);
text.setFont(font);
}
/**
* the main method
*/
public static void main(String[] argv) {
// Create frame
Welcome welcome = new Welcome();
welcome.setBackground(Color.WHITE);
welcome.setSize(WIDTH, HEIGHT);
welcome.setLocation(150, 100);
// add window closing listener
welcome.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent event) {
System.exit(0);
}
});
// Show the frame
welcome.setVisible(true);
}
}
有我的代码。
我需要做的是制作3种类型的字体（TimesRoman，Courier和Dialog）
选择框中的选项。
不知道我是怎么做的，必须在这里做点什么：
There is my code.
What I need to do is make 3 types of Font ( TimesRoman, Courier, and Dialog)
Choices in the Choice Boxes.
Not sure how i go about doing that, something has to be done here:
Label label1 = new Label("Select a Font style");
panel.add(label1);
faceFont = new Choice();
faceFont.add(COLOR_NAMES[0]);
faceFont.add(COLOR_NAMES[1]);
faceFont.add(TimesRoman);
panel.add(faceFont);
faceFont.addItemListener(new ItemListener() {
public void itemStateChanged(ItemEvent event) {
text.setForeground(COLORS[colorChoice.getSelectedIndex()]);
}
});
感谢任何帮助。
Any help is appreciated.
推荐答案
你可能需要使用 JList [ ^ ]。
You probably need to use a JList[^].
这篇关于通过选择框更改字体的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
查看全文
