Swing创建带图标的右键弹出菜单
2015-10-29 22:03
288 查看
在Windows的“开始”菜单上,会在菜单左侧显示一幅图像。很多基于Windows的软件也有类似效果的菜单。用Java Swing可以制作出类似效果的菜单吗?答案当然是肯定的,而且非常简单。
JImagedPopupMenu在创建时可以接受一个字符串,生成一副内存图片BufferedImage。然后,我们需要覆盖JComponent的getInsets方法,重新计算Inset的left值,将其在原数值基础上加上图片的宽度,然后返回。
JPopupMenu类扩展了javax.swing.JComponent,是Swing提供的一种菜单。 与其他形式菜单不同的是,JPopupMenu并不固定在菜单栏中,而是能够自由浮动。JPopupMenu具有很好的环境相关(context-
sensitive)特性,每一个JPopupMenu都与相应的控件相关联,该控件被称做调用者(invoker)。
package com.menu;
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.awt.image.*;
import javax.swing.*;
public class JImagedPopupMenu extends JPopupMenu {
private Font font = new Font("utf-8", Font.BOLD, 16);
private ImageIcon imageIcon = null;
public JImagedPopupMenu(ImageIcon imageIcon) {
this.imageIcon = imageIcon;
}
public JImagedPopupMenu(String text) {
this.imageIcon = createImage(text);
}
private ImageIcon createImage(String text) {
BufferedImage bi = new BufferedImage(30, 100, BufferedImage.TYPE_INT_ARGB);
ImageIcon image = new ImageIcon(bi);
Graphics2D g2d = bi.createGraphics();
GradientPaint paint = new GradientPaint(0, 0, Color.green.darker(),
30, 10, Color.yellow.brighter(), true);
g2d.setPaint(paint);
g2d.fillRect(0, 0, bi.getWidth(), bi.getHeight());
AffineTransform at = new AffineTransform();
at.rotate(-Math.PI / 2);
g2d.setTransform(at);
g2d.setColor(Color.darkGray);
g2d.setFont(font);
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2d.drawString(text, -150, bi.getWidth() / 2 + 5);
return image;
}
@Override
public Insets getInsets() {
Insets insets = (Insets) super.getInsets().clone();
insets.left += imageIcon.getIconWidth();
return insets;
}
@Override
public void paint(Graphics g) {
super.paint(g);
if (imageIcon != null) {
Insets insets = getInsets();
g.drawImage(imageIcon.getImage(),
insets.left - imageIcon.getIconWidth(),
insets.top,
null);
}
}
public static void main(String[] args) {
final JFrame frame = new JFrame();
frame.setSize(600, 400);
frame.setTitle("swing");
final JImagedPopupMenu menu = new JImagedPopupMenu("swing");
menu.add(new JMenuItem("Winzip 8.0"));
menu.addSeparator();
menu.add(new JMenuItem("Programs"));
menu.addSeparator();
menu.add(new JMenuItem("Document"));
menu.addSeparator();
menu.add(new JMenuItem("Run"));
menu.addSeparator();
menu.add(new JMenuItem("Shut Down"));
JLabel label = new JLabel(" click ");
label.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseReleased(MouseEvent e) {
if (e.isPopupTrigger()) {
menu.show(frame, e.getPoint().x, e.getPoint().y);
}
}
});
frame.getContentPane().add(label, BorderLayout.CENTER);
frame.show();
}
}
JImagedPopupMenu在创建时可以接受一个字符串,生成一副内存图片BufferedImage。然后,我们需要覆盖JComponent的getInsets方法,重新计算Inset的left值,将其在原数值基础上加上图片的宽度,然后返回。
JPopupMenu类扩展了javax.swing.JComponent,是Swing提供的一种菜单。 与其他形式菜单不同的是,JPopupMenu并不固定在菜单栏中,而是能够自由浮动。JPopupMenu具有很好的环境相关(context-
sensitive)特性,每一个JPopupMenu都与相应的控件相关联,该控件被称做调用者(invoker)。
Insets对象是容器边界的表示形式。它指定容器必须在其各个边缘留出的空间。这个空间可以是边界、空白空间或标题。
package com.menu;
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.awt.image.*;
import javax.swing.*;
public class JImagedPopupMenu extends JPopupMenu {
private Font font = new Font("utf-8", Font.BOLD, 16);
private ImageIcon imageIcon = null;
public JImagedPopupMenu(ImageIcon imageIcon) {
this.imageIcon = imageIcon;
}
public JImagedPopupMenu(String text) {
this.imageIcon = createImage(text);
}
private ImageIcon createImage(String text) {
BufferedImage bi = new BufferedImage(30, 100, BufferedImage.TYPE_INT_ARGB);
ImageIcon image = new ImageIcon(bi);
Graphics2D g2d = bi.createGraphics();
GradientPaint paint = new GradientPaint(0, 0, Color.green.darker(),
30, 10, Color.yellow.brighter(), true);
g2d.setPaint(paint);
g2d.fillRect(0, 0, bi.getWidth(), bi.getHeight());
AffineTransform at = new AffineTransform();
at.rotate(-Math.PI / 2);
g2d.setTransform(at);
g2d.setColor(Color.darkGray);
g2d.setFont(font);
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2d.drawString(text, -150, bi.getWidth() / 2 + 5);
return image;
}
@Override
public Insets getInsets() {
Insets insets = (Insets) super.getInsets().clone();
insets.left += imageIcon.getIconWidth();
return insets;
}
@Override
public void paint(Graphics g) {
super.paint(g);
if (imageIcon != null) {
Insets insets = getInsets();
g.drawImage(imageIcon.getImage(),
insets.left - imageIcon.getIconWidth(),
insets.top,
null);
}
}
public static void main(String[] args) {
final JFrame frame = new JFrame();
frame.setSize(600, 400);
frame.setTitle("swing");
final JImagedPopupMenu menu = new JImagedPopupMenu("swing");
menu.add(new JMenuItem("Winzip 8.0"));
menu.addSeparator();
menu.add(new JMenuItem("Programs"));
menu.addSeparator();
menu.add(new JMenuItem("Document"));
menu.addSeparator();
menu.add(new JMenuItem("Run"));
menu.addSeparator();
menu.add(new JMenuItem("Shut Down"));
JLabel label = new JLabel(" click ");
label.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseReleased(MouseEvent e) {
if (e.isPopupTrigger()) {
menu.show(frame, e.getPoint().x, e.getPoint().y);
}
}
});
frame.getContentPane().add(label, BorderLayout.CENTER);
frame.show();
}
}
相关文章推荐
- 深入理解C语言的函数调用过程
- 排序算法 之 快速排序
- 在jQuery与Node之间创建跨域请求(Cross-Origin Resource Sharing (CORS) )
- poj 2349 Arctic Network 最小生成树第k大边-kruskal
- Java中常用字符串方法总结
- 1058. A+B in Hogwarts
- CUDA之内存
- hdoj1042(N!,大数乘)
- myeclipse的jre与安装的jre不同之处
- 保龄球计分算法
- 【LeetCode从零单刷】Symmetric Tree
- 最大子序列和
- poj1274二分匹配入门
- 学习C++,应该循序渐进看哪些书?
- vsftpd 匿名用户只读不写的原因
- 河南第八届省赛(最小换乘)(最短路径,DP)
- 突击计划
- [leetcode] Summary of Linked List (1)
- java 占位符 拼接字符串
- UVA607