在 JDeskopPane 上写一段文字
Write a text on JDeskopPane
我想在 JDesktopPane 的右下角写多行文本(3-4 行即可),我该怎么做?
文本不是固定的,每次我启动 swing 应用程序时它都会改变,但是一旦应用程序启动它就保持不变,我不需要从应用程序更新。
我的第一个想法是创建一个图像,将其作为 JDesktopPane 的背景,然后在上面写字,但这似乎不是一个简单的解决方案。
感谢您的帮助。
使用这个例子class。
背景如果设置将被缩放。
import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import javax.swing.JDesktopPane;
public class MyDesktopPane extends JDesktopPane {
Image img;
public MyDesktopPane() {
super();
}
@Override
public void paintComponent(Graphics g) {
int width = this.getWidth();
int height = this.getHeight();
int infoWidth = 150;
int infoHeight = 100;
super.paintComponent(g);
// alpha
final Float alpha = new Float(0.9);
final Graphics2D g2d = (Graphics2D) g;
g2d.setComposite(makeComposite(alpha.floatValue()));
// draw bacground image is set
if (img != null) {
g.drawImage(img, 0, 0, width, height, this);
}
//draw 3 line text in red reound rectangle
g.setColor(Color.RED);
g.fillRoundRect(width - infoWidth, height - infoHeight, infoWidth, infoHeight, 5, 5);
g.setColor(Color.BLACK);
g.drawString("Line 1", width - infoWidth + 5, height - infoHeight + 20);
g.drawString("Line 2", width - infoWidth + 5, height - infoHeight + 40);
g.drawString("Line 3", width - infoWidth + 5, height - infoHeight + 60);
}
public void setBackGroundImage(String path) {
try {
boolean file = new File(path).isFile();
if (file) {
img = javax.imageio.ImageIO.read(new FileInputStream(path));
}
} catch (IOException e) {
e.printStackTrace();
}
this.repaint();
}
private AlphaComposite makeComposite(final float alpha) {
final int type = AlphaComposite.SRC_OVER;
return (AlphaComposite.getInstance(type, alpha));
}
}
结合看到的示例 here and here, the print()
method in the variation below illustrates using FontMetrics
右对齐 JDesktopPane
.
底部右角的多行文本
import java.awt.*;
import javax.swing.JDesktopPane;
import javax.swing.JFrame;
import javax.swing.JInternalFrame;
/** @see */
public class JDPTest extends JDesktopPane {
private MyFrame one = new MyFrame("One", 100, 100);
public JDPTest() {
this.setPreferredSize(new Dimension(640, 480));
this.add(one);
}
@Override
protected void paintComponent(Graphics g) {
Graphics2D g2d = (Graphics2D) g;
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g2d.setColor(Color.lightGray);
g2d.fillRect(0, 0, getWidth(), getHeight());
g2d.setColor(Color.BLACK);
g2d.setFont(new Font(Font.SERIF, Font.BOLD, 16));
print(g2d, 3, "Hello, world!");
print(g2d, 2, "This is a test.");
print(g2d, 1, "This is another test.");
print(g2d, 0, "This is still another test.");
}
private void print(Graphics2D g2d, int line, String s) {
FontMetrics fm = g2d.getFontMetrics();
int x = this.getWidth() - fm.stringWidth(s) - 5;
int y = this.getHeight() - fm.getDescent()
- line * (fm.getHeight() + fm.getLeading());
g2d.drawString(s, x, y);
}
private final class MyFrame extends JInternalFrame {
MyFrame(String name, int x, int y) {
super(name, true, true, true, true);
this.setSize(320, 240);
this.setLocation(x, y);
this.setVisible(true);
}
}
private void display() {
JFrame f = new JFrame("JDPTest");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.add(this);
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
new JDPTest().display();
}
});
}
}
我想在 JDesktopPane 的右下角写多行文本(3-4 行即可),我该怎么做?
文本不是固定的,每次我启动 swing 应用程序时它都会改变,但是一旦应用程序启动它就保持不变,我不需要从应用程序更新。
我的第一个想法是创建一个图像,将其作为 JDesktopPane 的背景,然后在上面写字,但这似乎不是一个简单的解决方案。
感谢您的帮助。
使用这个例子class。 背景如果设置将被缩放。
import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import javax.swing.JDesktopPane;
public class MyDesktopPane extends JDesktopPane {
Image img;
public MyDesktopPane() {
super();
}
@Override
public void paintComponent(Graphics g) {
int width = this.getWidth();
int height = this.getHeight();
int infoWidth = 150;
int infoHeight = 100;
super.paintComponent(g);
// alpha
final Float alpha = new Float(0.9);
final Graphics2D g2d = (Graphics2D) g;
g2d.setComposite(makeComposite(alpha.floatValue()));
// draw bacground image is set
if (img != null) {
g.drawImage(img, 0, 0, width, height, this);
}
//draw 3 line text in red reound rectangle
g.setColor(Color.RED);
g.fillRoundRect(width - infoWidth, height - infoHeight, infoWidth, infoHeight, 5, 5);
g.setColor(Color.BLACK);
g.drawString("Line 1", width - infoWidth + 5, height - infoHeight + 20);
g.drawString("Line 2", width - infoWidth + 5, height - infoHeight + 40);
g.drawString("Line 3", width - infoWidth + 5, height - infoHeight + 60);
}
public void setBackGroundImage(String path) {
try {
boolean file = new File(path).isFile();
if (file) {
img = javax.imageio.ImageIO.read(new FileInputStream(path));
}
} catch (IOException e) {
e.printStackTrace();
}
this.repaint();
}
private AlphaComposite makeComposite(final float alpha) {
final int type = AlphaComposite.SRC_OVER;
return (AlphaComposite.getInstance(type, alpha));
}
}
结合看到的示例 here and here, the print()
method in the variation below illustrates using FontMetrics
右对齐 JDesktopPane
.
import java.awt.*;
import javax.swing.JDesktopPane;
import javax.swing.JFrame;
import javax.swing.JInternalFrame;
/** @see */
public class JDPTest extends JDesktopPane {
private MyFrame one = new MyFrame("One", 100, 100);
public JDPTest() {
this.setPreferredSize(new Dimension(640, 480));
this.add(one);
}
@Override
protected void paintComponent(Graphics g) {
Graphics2D g2d = (Graphics2D) g;
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g2d.setColor(Color.lightGray);
g2d.fillRect(0, 0, getWidth(), getHeight());
g2d.setColor(Color.BLACK);
g2d.setFont(new Font(Font.SERIF, Font.BOLD, 16));
print(g2d, 3, "Hello, world!");
print(g2d, 2, "This is a test.");
print(g2d, 1, "This is another test.");
print(g2d, 0, "This is still another test.");
}
private void print(Graphics2D g2d, int line, String s) {
FontMetrics fm = g2d.getFontMetrics();
int x = this.getWidth() - fm.stringWidth(s) - 5;
int y = this.getHeight() - fm.getDescent()
- line * (fm.getHeight() + fm.getLeading());
g2d.drawString(s, x, y);
}
private final class MyFrame extends JInternalFrame {
MyFrame(String name, int x, int y) {
super(name, true, true, true, true);
this.setSize(320, 240);
this.setLocation(x, y);
this.setVisible(true);
}
}
private void display() {
JFrame f = new JFrame("JDPTest");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.add(this);
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
new JDPTest().display();
}
});
}
}