如何根据其大小更改JButton的字体大小？ [英] How to change font size of JButton according to its size?
本文介绍了如何根据其大小更改JButton的字体大小？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
我的想法是使用ComponentEvents。我有初始大小的应用程序窗口和初始字体的大小。我想根据按钮的大小更改字体大小，受窗口大小更改的影响。问题是如何在重写方法中使用比率[初始窗口大小] / [初始字体大小]？每个字体的比例是不同的。
import javax.swing。*;
import java.awt。*;
import java.awt.event.ComponentEvent;
import java.awt.event.ComponentListener;
$ b public class Main扩展JFrame {
public Main（）{
super（Test）;
JPanel cPane =（JPanel）getContentPane（）;
cPane.setLayout（new BorderLayout（））;
MyButton sampleButton = new MyButton（Sample text）;
sampleButton.setFont（new Font（Sans Serif，Font.PLAIN，20））;
MyButton a，b，c，d;
a = new MyButton（a）;
b = new MyButton（b）;
c = new MyButton（c）;
d = new MyButton（d）;
cPane.add（a，BorderLayout.PAGE_START）;
cPane.add（b，BorderLayout.PAGE_END）;
cPane.add（c，BorderLayout.LINE_START）;
cPane.add（d，BorderLayout.LINE_END）;
cPane.add（sampleButton，BorderLayout.CENTER）;
setSize（300，200）;
setResizable（true）;
setDefaultCloseOperation（WindowConstants.EXIT_ON_CLOSE）;
setVisible（true）;
public static void main（String ... args）{
new Main（）;
}
class MyButton继承JButton实现ComponentListener {
public MyButton（String title）{
super（title）;
$ b @Override
public void componentResized（ComponentEvent e）{
//调整字体大小
}
@Override
public void componentMoved（ComponentEvent e）{
}
@Override
public void componentShown（ComponentEvent e）{
}
@Override
public void componentHidden（ComponentEvent e）{
$看看你如何使用这个代码去使用 GlyphVector c $ c>来确定最适合的 Font 。
- 除非在设置可见框架和添加
ComponentListener 之间有延迟， code>。我通过延迟添加侦听器来解决这个问题Swing Timer 。
- 是基于 ScriptEngine
。
import java.awt。*;
import java.awt.event。*;
import java.awt.font。*;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import javax.swing。*;
import javax.swing.border.EmptyBorder;
import java.util.ArrayList;
import javax.script。*;
import javax.swing.border.Border;
类SwingCalculator实现了ActionListener，KeyListener {
JTextField io;
ScriptEngine引擎;
ArrayList< JButton>控制;
final BufferedImage textImage = new BufferedImage（
100,100，
BufferedImage.TYPE_INT_ARGB）;
public int getMaxFontSizeForControls（）{
Graphics2D g = textImage.createGraphics（）;
FontRenderContext frc = g.getFontRenderContext（）;
int maxSize = 500;
for（JButton b：controls）{
// skip the = button ..
if（！b.getText（）。equals（=））{
int max = getMaxFontSizeForControl（b，frc）;
if（maxSize> max）{
maxSize = max;
}
}
}
g.dispose（）;
返回maxSize;
public int getMaxFontSizeForControl（JButton button，FontRenderContext frc）{
Rectangle r = button.getBounds（）;
Insets m = button.getMargin（）;
Insets i = button.getBorder（）。getBorderInsets（button）;
Rectangle viewableArea = new Rectangle（
r.width -
（m.right + m.left + i.left + i.right），
r.height -
（m.top + m.bottom + i.top + i.bottom）
）;
Font font = button.getFont（）;
int size = 1;
boolean tooBig = false; （！tooBig）{
Font f = font.deriveFont（（float）size）;
GlyphVector gv = f.createGlyphVector（frc，button.getText（））;
Rectangle2D box = gv.getVisualBounds（）;
if（box.getHeight（）> viewableArea.getHeight（）
|| box.getWidth（）> viewableArea.getWidth（））{
tooBig = true;
size--;
}
size ++;
}
返回大小;
SwingCalculator（）{
//获取对JS引擎的引用
engine = new ScriptEngineManager（）。getEngineByExtension（js）;
JPanel gui = new JPanel（新的BorderLayout（2,2））;
controls = new ArrayList< JButton>（）;
JPanel text = new JPanel（new GridLayout（0，1，3，3））;
gui.add（text，BorderLayout.NORTH）;
io = new JTextField（15）;
Font font = io.getFont（）;
font = font.deriveFont（font.getSize（）* 1.7f）;
io.setFont（font）;
io.setHorizontalAlignment（SwingConstants.TRAILING）;
io.setFocusable（false）;
text.add（io）;
JPanel按钮= new JPanel（新的GridLayout（4，4，2，2））;
gui.add（buttons，BorderLayout.CENTER）;
addButton（按钮，7）;
addButton（按钮，8）;
addButton（按钮，9）;
addButton（buttons，/）;
addButton（按钮，4）;
addButton（按钮，5）;
addButton（按钮，6）;
addButton（按钮，*）;
addButton（按钮，1）;
addButton（按钮，2）;
addButton（按钮，3）;
addButton（buttons， - ）;
addButton（buttons，0）;
addButton（buttons，。）;
addButton（按钮，C）;
addButton（按钮，+）;
JButton equals = new JButton（=）;
equals.addKeyListener（this）;
controls.add（等于）;
equals.addActionListener（this）;
gui.add（等于，BorderLayout.EAST）;
gui.setBorder（new EmptyBorder（5，5，5））;
final JFrame f = new JFrame（Calculet）;
f.setDefaultCloseOperation（JFrame.EXIT_ON_CLOSE）;
f.setContentPane（gui）;
f.pack（）;
f.setMinimumSize（f.getSize（））;
f.setLocationByPlatform（true）;
f.setVisible（true）;
final ComponentListener cl = new ComponentAdapter（）{
$ b $ @Override
public void componentResized（ComponentEvent e）{
int ii = getMaxFontSizeForControls（）;
for（JButton b：controls）{
if（！b.getText（）。equals（=））{
b.setFont（b.getFont（）。deriveFont（（ float）ii））;
}
}
}
};
ActionListener al = new ActionListener（）{
$ b @Override
public void actionPerformed（ActionEvent e）{
f.addComponentListener（cl）;
}
};
定时器t =新定时器（500，al）;
t.setRepeats（false）;
t.start（）;
$ b $ public void addButton（Container c，String text）{
JButton b = new JButton（text）;
b.addActionListener（this）;
b.addKeyListener（this）;
controls.add（b）;
c.add（b）;
$ b $ public void calculateResult（）{
try {
Object result = engine.eval（io.getText（））;
if（result == null）{
io.setText（Output was'null'）;
} else {
io.setText（result.toString（））;
} catch（ScriptException se）{
io.setText（se.getMessage（））;
$ b $ public void actionPerformed（ActionEvent ae）{
String command = ae.getActionCommand（）;
if（command.equals（C））{
io.setText（）;
} else if（command.equals（=））{
calculateResult（）;
} else {
io.setText（io.getText（）+ command）;
$ b $ private JButton getButton（String text）{
for（JButton button：controls）{
String s = button.getText（） ;
if（text.endsWith（s）
||（s.equals（=）
&&（text.equals（Equals）|| text.equals Enter））））{
return button;
}
}
返回null;
}
/ *
*开始 - 因为我讨厌老鼠。
* /
public void keyPressed（KeyEvent ke）{
}
public void keyReleased（KeyEvent ke）{
String s = ke.getKeyText ke.getKeyCode（））;
JButton b = getButton（s）;
if（b！= null）{
b.requestFocusInWindow（）;
b.doClick（）;
public void keyTyped（KeyEvent ke）{
}
public static void main（String [] args）{
Runnable r = new Runnable（）{
@Override
public void run（）{
new SwingCalculator（）;
}
};
// Swing GUIs应该在EDT
上创建和更新// http://docs.oracle.com/javase/tutorial/uiswing/concurrency
SwingUtilities.invokeLater（r）;
}
}
I have a java application - a calculator. I want to resize font of buttons dynamically with resizing the window of the app. How to implement it?
My idea is using ComponentEvents. I have initial size of the window of application and initial fonts' sizes. I want to change font size according to button's size, affected by window size change. The problem is how to use the ratio [initial window size] / [initial font size] in the overriden method? The ratio is different for each font.
import javax.swing.*;
import java.awt.*;
import java.awt.event.ComponentEvent;
import java.awt.event.ComponentListener;
public class Main extends JFrame {
public Main() {
super("Test");
JPanel cPane = (JPanel) getContentPane();
cPane.setLayout(new BorderLayout());
MyButton sampleButton = new MyButton("Sample text");
sampleButton.setFont(new Font("Sans Serif", Font.PLAIN, 20));
MyButton a, b, c, d;
a = new MyButton("a");
b = new MyButton("b");
c = new MyButton("c");
d = new MyButton("d");
cPane.add(a, BorderLayout.PAGE_START);
cPane.add(b, BorderLayout.PAGE_END);
cPane.add(c, BorderLayout.LINE_START);
cPane.add(d, BorderLayout.LINE_END);
cPane.add(sampleButton, BorderLayout.CENTER);
setSize(300, 200);
setResizable(true);
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
setVisible(true);
}
public static void main(String... args) {
new Main();
}
class MyButton extends JButton implements ComponentListener {
public MyButton(String title) {
super(title);
}
@Override
public void componentResized(ComponentEvent e) {
//resizing font
}
@Override
public void componentMoved(ComponentEvent e) {
}
@Override
public void componentShown(ComponentEvent e) {
}
@Override
public void componentHidden(ComponentEvent e) {
}
}
}
解决方案 See how you go with this code using GlyphVector to determine the largest Font that will fit.
- The GUI was a little shaky unless there was a delay between setting the frame visible and adding the
ComponentListener. I solved that by delaying adding the listener using a single shot Swing Timer.
- Is is based on
Calculet which is a fully functioning (if simple) calculator using the ScriptEngine.
import java.awt.*;
import java.awt.event.*;
import java.awt.font.*;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import javax.swing.*;
import javax.swing.border.EmptyBorder;
import java.util.ArrayList;
import javax.script.*;
import javax.swing.border.Border;
class SwingCalculator implements ActionListener, KeyListener {
JTextField io;
ScriptEngine engine;
ArrayList<JButton> controls;
final BufferedImage textImage = new BufferedImage(
100, 100,
BufferedImage.TYPE_INT_ARGB);
public int getMaxFontSizeForControls() {
Graphics2D g = textImage.createGraphics();
FontRenderContext frc = g.getFontRenderContext();
int maxSize = 500;
for (JButton b : controls) {
// skip the = button..
if (!b.getText().equals("=")) {
int max = getMaxFontSizeForControl(b, frc);
if (maxSize > max) {
maxSize = max;
}
}
}
g.dispose();
return maxSize;
}
public int getMaxFontSizeForControl(JButton button, FontRenderContext frc) {
Rectangle r = button.getBounds();
Insets m = button.getMargin();
Insets i = button.getBorder().getBorderInsets(button);
Rectangle viewableArea = new Rectangle(
r.width -
(m.right + m.left + i.left + i.right),
r.height -
(m.top + m.bottom + i.top + i.bottom)
);
Font font = button.getFont();
int size = 1;
boolean tooBig = false;
while (!tooBig) {
Font f = font.deriveFont((float) size);
GlyphVector gv = f.createGlyphVector(frc, button.getText());
Rectangle2D box = gv.getVisualBounds();
if (box.getHeight() > viewableArea.getHeight()
|| box.getWidth() > viewableArea.getWidth()) {
tooBig = true;
size--;
}
size++;
}
return size;
}
SwingCalculator() {
// obtain a reference to the JS engine
engine = new ScriptEngineManager().getEngineByExtension("js");
JPanel gui = new JPanel(new BorderLayout(2, 2));
controls = new ArrayList<JButton>();
JPanel text = new JPanel(new GridLayout(0, 1, 3, 3));
gui.add(text, BorderLayout.NORTH);
io = new JTextField(15);
Font font = io.getFont();
font = font.deriveFont(font.getSize() * 1.7f);
io.setFont(font);
io.setHorizontalAlignment(SwingConstants.TRAILING);
io.setFocusable(false);
text.add(io);
JPanel buttons = new JPanel(new GridLayout(4, 4, 2, 2));
gui.add(buttons, BorderLayout.CENTER);
addButton(buttons, "7");
addButton(buttons, "8");
addButton(buttons, "9");
addButton(buttons, "/");
addButton(buttons, "4");
addButton(buttons, "5");
addButton(buttons, "6");
addButton(buttons, "*");
addButton(buttons, "1");
addButton(buttons, "2");
addButton(buttons, "3");
addButton(buttons, "-");
addButton(buttons, "0");
addButton(buttons, ".");
addButton(buttons, "C");
addButton(buttons, "+");
JButton equals = new JButton("=");
equals.addKeyListener(this);
controls.add(equals);
equals.addActionListener(this);
gui.add(equals, BorderLayout.EAST);
gui.setBorder(new EmptyBorder(5, 5, 5, 5));
final JFrame f = new JFrame("Calculet");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setContentPane(gui);
f.pack();
f.setMinimumSize(f.getSize());
f.setLocationByPlatform(true);
f.setVisible(true);
final ComponentListener cl = new ComponentAdapter() {
@Override
public void componentResized(ComponentEvent e) {
int ii = getMaxFontSizeForControls();
for (JButton b : controls) {
if (!b.getText().equals("=")) {
b.setFont(b.getFont().deriveFont((float) ii));
}
}
}
};
ActionListener al = new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
f.addComponentListener(cl);
}
};
Timer t = new Timer(500, al);
t.setRepeats(false);
t.start();
}
public void addButton(Container c, String text) {
JButton b = new JButton(text);
b.addActionListener(this);
b.addKeyListener(this);
controls.add(b);
c.add(b);
}
public void calculateResult() {
try {
Object result = engine.eval(io.getText());
if (result == null) {
io.setText("Output was 'null'");
} else {
io.setText(result.toString());
}
} catch (ScriptException se) {
io.setText(se.getMessage());
}
}
public void actionPerformed(ActionEvent ae) {
String command = ae.getActionCommand();
if (command.equals("C")) {
io.setText("");
} else if (command.equals("=")) {
calculateResult();
} else {
io.setText(io.getText() + command);
}
}
private JButton getButton(String text) {
for (JButton button : controls) {
String s = button.getText();
if (text.endsWith(s)
|| (s.equals("=")
&& (text.equals("Equals") || text.equals("Enter")))) {
return button;
}
}
return null;
}
/*
* START - Because I hate mice.
*/
public void keyPressed(KeyEvent ke) {
}
public void keyReleased(KeyEvent ke) {
String s = ke.getKeyText(ke.getKeyCode());
JButton b = getButton(s);
if (b != null) {
b.requestFocusInWindow();
b.doClick();
}
}
public void keyTyped(KeyEvent ke) {
}
public static void main(String[] args) {
Runnable r = new Runnable() {
@Override
public void run() {
new SwingCalculator();
}
};
// Swing GUIs should be created and updated on the EDT
// http://docs.oracle.com/javase/tutorial/uiswing/concurrency
SwingUtilities.invokeLater(r);
}
}
这篇关于如何根据其大小更改JButton的字体大小？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
