Go语言视频零基础入门到精通

javalearner · 发表于 2014-11-11 23:57:09

在Windows系统中，通常都会有左侧导航栏以供选择，而java架构下并没有给我们提供同样的组件，但是构建同样的东西实际上是很容易的。

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.GradientPaint;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridLayout;
import java.awt.Insets;
import java.awt.Rectangle;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import javax.swing.BorderFactory;
import javax.swing.ButtonGroup;
import javax.swing.JCheckBox;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JScrollPane;
import javax.swing.JSplitPane;
import javax.swing.SpringLayout;
import javax.swing.WindowConstants;
import javax.swing.border.Border;
/** *//**
*
* Title: LoonFramework
*
*
* Description:
* Copyright: Copyright (c) 2007
*
*
* Company: LoonFramework
*
* @author chenpeng
* @email：ceponline@yahoo.com.cn
* @version 0.1
*/
public class ExampleAccordion extends JPanel {
/** *//**
*
*/
private static final long serialVersionUID = 1L;
private final JPanel panel = new JPanel();
private final JLabel label = new JLabel();
// 分割窗体
private final JSplitPane split = new JSplitPane();
private final JScrollPane scroll;
// 折叠效果
public ExampleAccordion() {
super(new BorderLayout());
panel.setOpaque(true);
panel.setBackground(new Color(116, 149, 226));
// 滚动条
scroll = new JScrollPane(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
scroll.getVerticalScrollBar().setUnitIncrement(10);
scroll.getViewport().add(panel);
// 构建数据列表
List panelList = makeList();
// 设定监听
accordionListener exr = new accordionListener() {
public void accordionStateChanged(accordionEvent e) {
initComponent();
}
};
for (Iterator it = panelList.iterator(); it.hasNext();) {
AccordionPanel epl = (AccordionPanel) it.next();
addComponent(epl);
epl.addaccordionListener(exr);
}
// 加载滚动条监听
scroll.getViewport().addComponentListener(new ComponentAdapter() {
public void componentResized(ComponentEvent e) {
initComponent();
}
});
// 设定大小
label.setPreferredSize(new Dimension(200, 260));
scroll.setPreferredSize(new Dimension(200, 260));
scroll.setMinimumSize(new Dimension(200, 260));
split.setLeftComponent(scroll);
split.setRightComponent(label);
split.setDividerSize(1);
split.setBackground(Color.WHITE);
add(split, BorderLayout.CENTER);
}
public void initComponent() {
Rectangle re = scroll.getViewport().getViewRect();
Insets ins = panel.getInsets();
int cw = (int) re.getWidth() - ins.left - ins.right - 20;
int ch = 10;
Component[] list = panel.getComponents();
for (int i = 0; i < list.length; i++) {
JComponent tmp = (JComponent) list[i];
int th = tmp.getPreferredSize().height;
tmp.setPreferredSize(new Dimension(cw, th));
ch = ch + th + 10;
}
panel.setPreferredSize(new Dimension((int) re.getWidth(), ch + ins.top
+ ins.bottom));
panel.revalidate();
}
public void addComponent(Component label) {
SpringLayout layout = new SpringLayout();
Component[] list = panel.getComponents();
if (list.length == 0) {
layout.putConstraint(SpringLayout.WEST, label, 10,
SpringLayout.WEST, panel);
layout.putConstraint(SpringLayout.NORTH, label, 10,
SpringLayout.NORTH, panel);
} else {
JComponent cmp = null;
for (int i = 0; i < list.length; i++) {
JComponent tmp = (JComponent) list[i];
layout.putConstraint(SpringLayout.WEST, tmp, 10,
SpringLayout.WEST, panel);
if (cmp == null) {
layout.putConstraint(SpringLayout.NORTH, tmp, 10,
SpringLayout.NORTH, panel);
} else {
layout.putConstraint(SpringLayout.NORTH, tmp, 10,
SpringLayout.SOUTH, cmp);
}
cmp = tmp;
}
layout.putConstraint(SpringLayout.WEST, label, 10,
SpringLayout.WEST, panel);
layout.putConstraint(SpringLayout.NORTH, label, 10,
SpringLayout.SOUTH, cmp);
}
panel.add(label);
panel.setLayout(layout);
initComponent();
}
private List makeList() {
List panelList = new ArrayList();
panelList.add(new AccordionPanel("列表1") {
/** *//**
*
*/
private static final long serialVersionUID = 1L;
public JPanel makePanel() {
JPanel pnl = new JPanel(new GridLayout(0, 1));
JCheckBox c1 = new JCheckBox("aaaaaa");
JCheckBox c2 = new JCheckBox("bbbbbb");
c1.setOpaque(false);
c2.setOpaque(false);
pnl.add(c1);
pnl.add(c2);
pnl.setSize(new Dimension(0, 60));
pnl.setBorder(BorderFactory.createEmptyBorder(5, 15, 5, 15));
return pnl;
}
});
panelList.add(new AccordionPanel("列表2") {
/** *//**
*
*/
private static final long serialVersionUID = 1L;
public JPanel makePanel() {
JPanel pnl = new JPanel(new GridLayout(0, 1));
pnl.add(new JLabel("辛苦遭逢起一经"));
pnl.add(new JLabel("干戈寥落四周星"));
pnl.add(new JLabel("山河破碎风飘絮"));
pnl.add(new JLabel("身世浮沉雨打萍"));
pnl.setSize(new Dimension(0, 100));
pnl.setBorder(BorderFactory.createEmptyBorder(5, 15, 5, 15));
return pnl;
}
});
panelList.add(new AccordionPanel("列表3") {
/** *//**
*
*/
private static final long serialVersionUID = 1L;
public JPanel makePanel() {
JPanel pnl = new JPanel(new GridLayout(0, 1));
JRadioButton b1 = new JRadioButton("aa");
JRadioButton b2 = new JRadioButton("bb");
JRadioButton b3 = new JRadioButton("cc");
b1.setOpaque(false);
b2.setOpaque(false);
b3.setOpaque(false);
pnl.add(b1);
pnl.add(b2);
pnl.add(b3);
ButtonGroup bg = new ButtonGroup();
bg.add(b1);
bg.add(b2);
bg.add(b3);
b1.setSelected(true);
pnl.setSize(new Dimension(0, 80));
pnl.setBorder(BorderFactory.createEmptyBorder(5, 15, 5, 15));
return pnl;
}
});
return panelList;
}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
createUI();
}
});
}
public static void createUI() {
JFrame frame = new JFrame("JAVA实现类Windows导航栏");
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
frame.getContentPane().add(new ExampleAccordion());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}
class accordionEvent extends java.util.EventObject {
/** *//**
*
*/
private static final long serialVersionUID = 1L;
public accordionEvent(Object source) {
super(source);
}
}
interface accordionListener {
public void accordionStateChanged(accordionEvent e);
}
abstract class AccordionPanel extends JPanel {
abstract public JPanel makePanel();
private final String _title;
private final JLabel label;
private final JPanel panel;
private boolean openFlag = false;
public AccordionPanel(String title) {
super(new BorderLayout());
_title = title;
label = new JLabel("↓ " + title) {
/** *//**
*
*/
private static final long serialVersionUID = 1L;
protected void paintComponent(Graphics g) {
Graphics2D g2 = (Graphics2D) g;
// 绘制渐变
g2.setPaint(new GradientPaint(50, 0, Color.WHITE, getWidth(),
getHeight(), new Color(199, 212, 247)));
g2.fillRect(0, 0, getWidth(), getHeight());
super.paintComponent(g);
}
};
label.addMouseListener(new MouseAdapter() {
public void mousePressed(MouseEvent evt) {
openFlag = !openFlag;
initPanel();
fireaccordionEvent();
}
});
label.setForeground(new Color(33, 93, 198));
label.setFont(new Font("宋体", 1, 12));
label.setBorder(BorderFactory.createEmptyBorder(2, 5, 2, 2));
panel = makePanel();
panel.setOpaque(true);
Border outBorder = BorderFactory.createMatteBorder(0, 2, 2, 2,
Color.WHITE);
Border inBorder = BorderFactory.createEmptyBorder(10, 10, 10, 10);
Border border = BorderFactory.createCompoundBorder(outBorder, inBorder);
panel.setBorder(border);
panel.setBackground(new Color(240, 240, 255));
add(label, BorderLayout.NORTH);
}
public boolean isSelected() {
return openFlag;
}
public void setSelected(boolean flg) {
openFlag = flg;
initPanel();
}
protected void initPanel() {
if (isSelected()) {
label.setText("↑ " + _title);
add(panel, BorderLayout.CENTER);
setPreferredSize(new Dimension(getSize().width,
label.getSize().height + panel.getSize().height));
} else {
label.setText("↓ " + _title);
remove(panel);
setPreferredSize(new Dimension(getSize().width,
label.getSize().height));
}
revalidate();
}
protected ArrayList accordionListenerList = new ArrayList();
public void addaccordionListener(accordionListener listener) {
if (!accordionListenerList.contains(listener))
accordionListenerList.add(listener);
}
public void removeaccordionListener(accordionListener listener) {
accordionListenerList.remove(listener);
}
public void fireaccordionEvent() {
List list = (List) accordionListenerList.clone();
Iterator it = list.iterator();
accordionEvent e = new accordionEvent(this);
while (it.hasNext()) {
accordionListener listener = (accordionListener) it.next();
listener.accordionStateChanged(e);
}
}
}

复制代码

源码下载：http://file.javaxxz.com/2014/11/11/235709250.zip

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