怎么样实现面板自动收缩的动能? 登录QQ,当你的鼠标移上QQ面板时,它就会显示完整的面板界面,而当你鼠标移开时,它就会自动收缩,隐闭了起来,请问怎么样实现这种效果?请高手指点指点!小弟感觉不尽。 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 import java.awt.*;import java.awt.event.*;import java.awt.font.*;import java.awt.image.BufferedImage;import javax.swing.*;public class ExpandingPanels extends MouseAdapter { ActionPanel[] aps; JPanel[] panels; public ExpandingPanels() { assembleActionPanels(); assemblePanels(); } public void mousePressed(MouseEvent e) { ActionPanel ap = (ActionPanel) e.getSource(); if (ap.target.contains(e.getPoint())) { ap.toggleSelection(); togglePanelVisibility(ap); } } private void togglePanelVisibility(ActionPanel ap) { int index = getPanelIndex(ap); if (panels[index].isShowing()) panels[index].setVisible(false); else panels[index].setVisible(true); ap.getParent().validate(); } private int getPanelIndex(ActionPanel ap) { for (int j = 0; j < aps.length; j++) if (ap == aps[j]) return j; return -1; } private void assembleActionPanels() { String[] ids = { "level 1", "level 2", "level 3", "level 4" }; aps = new ActionPanel[ids.length]; for (int j = 0; j < aps.length; j++) aps[j] = new ActionPanel(ids[j], this); } private void assemblePanels() { GridBagConstraints gbc = new GridBagConstraints(); gbc.insets = new Insets(2, 1, 2, 1); gbc.weightx = 1.0; gbc.weighty = 1.0; JPanel p1 = new JPanel(new GridBagLayout()); gbc.gridwidth = gbc.RELATIVE; p1.add(new JButton("button 1"), gbc); gbc.gridwidth = gbc.REMAINDER; p1.add(new JButton("button 2"), gbc); gbc.gridwidth = gbc.RELATIVE; p1.add(new JButton("button 3"), gbc); gbc.gridwidth = gbc.REMAINDER; p1.add(new JButton("button 4"), gbc); JPanel p2 = new JPanel(new GridBagLayout()); gbc.gridwidth = 1; gbc.anchor = gbc.EAST; p2.add(new JLabel("enter"), gbc); gbc.anchor = gbc.WEST; p2.add(new JTextField(8), gbc); gbc.anchor = gbc.CENTER; p2.add(new JButton("button 1"), gbc); gbc.gridwidth = gbc.REMAINDER; p2.add(new JButton("button 2"), gbc); JPanel p3 = new JPanel(new BorderLayout()); JTextArea textArea = new JTextArea(8, 12); textArea.setLineWrap(true); p3.add(new JScrollPane(textArea)); JPanel p4 = new JPanel(new GridBagLayout()); addComponents(new JLabel("label 1"), new JTextField(12), p4, gbc); addComponents(new JLabel("label 2"), new JTextField(16), p4, gbc); gbc.gridwidth = 2; gbc.gridy = 2; p4.add(new JSlider(), gbc); gbc.gridy++; JPanel p5 = new JPanel(new GridBagLayout()); p5.add(new JButton("button 1"), gbc); p5.add(new JButton("button 2"), gbc); p5.add(new JButton("button 3"), gbc); p5.add(new JButton("button 4"), gbc); gbc.weighty = 1.0; gbc.fill = gbc.BOTH; p4.add(p5, gbc); panels = new JPanel[] { p1, p2, p3, p4 }; } private void addComponents(Component c1, Component c2, Container c, GridBagConstraints gbc) { gbc.anchor = gbc.EAST; gbc.gridwidth = gbc.RELATIVE; c.add(c1, gbc); gbc.anchor = gbc.WEST; gbc.gridwidth = gbc.REMAINDER; c.add(c2, gbc); gbc.anchor = gbc.CENTER; } private JPanel getComponent() { JPanel panel = new JPanel(new GridBagLayout()); GridBagConstraints gbc = new GridBagConstraints(); gbc.insets = new Insets(1, 3, 0, 3); gbc.weightx = 1.0; gbc.fill = gbc.HORIZONTAL; gbc.gridwidth = gbc.REMAINDER; for (int j = 0; j < aps.length; j++) { panel.add(aps[j], gbc); panel.add(panels[j], gbc); panels[j].setVisible(false); } JLabel padding = new JLabel(); gbc.weighty = 1.0; panel.add(padding, gbc); return panel; } public static void main(String[] args) { ExpandingPanels test = new ExpandingPanels(); JFrame f = new JFrame(); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); f.getContentPane().add(new JScrollPane(test.getComponent())); f.setSize(360, 500); f.setLocation(200, 100); f.setVisible(true); }}class ActionPanel extends JPanel { String text; Font font; private boolean selected; BufferedImage open, closed; Rectangle target; final int OFFSET = 30, PAD = 5; public ActionPanel(String text, MouseListener ml) { this.text = text; addMouseListener(ml); font = new Font("sans-serif", Font.PLAIN, 12); selected = false; setBackground(new Color(200, 200, 220)); setPreferredSize(new Dimension(200, 20)); setBorder(BorderFactory.createRaisedBevelBorder()); setPreferredSize(new Dimension(200, 20)); createImages(); setRequestFocusEnabled(true); } public void toggleSelection() { selected = !selected; repaint(); } protected void paintComponent(Graphics g) { super.paintComponent(g); Graphics2D g2 = (Graphics2D) g; g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); int w = getWidth(); int h = getHeight(); if (selected) g2.drawImage(open, PAD, 0, this); else g2.drawImage(closed, PAD, 0, this); g2.setFont(font); FontRenderContext frc = g2.getFontRenderContext(); LineMetrics lm = font.getLineMetrics(text, frc); float height = lm.getAscent() + lm.getDescent(); float x = OFFSET; float y = (h + height) / 2 - lm.getDescent(); g2.drawString(text, x, y); } private void createImages() { int w = 20; int h = getPreferredSize().height; target = new Rectangle(2, 0, 20, 18); open = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB); Graphics2D g2 = open.createGraphics(); g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); g2.setPaint(getBackground()); g2.fillRect(0, 0, w, h); int[] x = { 2, w / 2, 18 }; int[] y = { 4, 15, 4 }; Polygon p = new Polygon(x, y, 3); g2.setPaint(Color.green.brighter()); g2.fill(p); g2.setPaint(Color.blue.brighter()); g2.draw(p); g2.dispose(); closed = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB); g2 = closed.createGraphics(); g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); g2.setPaint(getBackground()); g2.fillRect(0, 0, w, h); x = new int[] { 3, 13, 3 }; y = new int[] { 4, h / 2, 16 }; p = new Polygon(x, y, 3); g2.setPaint(Color.red); g2.fill(p); g2.setPaint(Color.blue.brighter()); g2.draw(p); g2.dispose(); }} 我写的贪吃蛇-逻辑问题:运行时,会突然多出1个食物,求解 是InputStream抽象类,可却有构造方法。那能创建对象吗? java程序连接ACCESS数据库的问题 不同类型转换问题!~!~~!(对照不同) jdbc问题,急 一个关于tomcat+mysql出现问题的问题 卷滚条的卷滚事件的类型始终返回相同的值?(在线,立即给分) 各位朋友,我是新学习JAVA的,不知道买什么书比较好呢? 动态设置表单? 为什么我没有这些注解? Jreator 很不爽的地方,大家一定会碰到的.期待高手 输出类名时后面跟了奇怪的尾巴?怎么会事!
import java.awt.event.*;
import java.awt.font.*;
import java.awt.image.BufferedImage;
import javax.swing.*;public class ExpandingPanels extends MouseAdapter {
ActionPanel[] aps;
JPanel[] panels; public ExpandingPanels() {
assembleActionPanels();
assemblePanels();
} public void mousePressed(MouseEvent e) {
ActionPanel ap = (ActionPanel) e.getSource();
if (ap.target.contains(e.getPoint())) {
ap.toggleSelection();
togglePanelVisibility(ap);
}
} private void togglePanelVisibility(ActionPanel ap) {
int index = getPanelIndex(ap);
if (panels[index].isShowing())
panels[index].setVisible(false);
else
panels[index].setVisible(true);
ap.getParent().validate();
} private int getPanelIndex(ActionPanel ap) {
for (int j = 0; j < aps.length; j++)
if (ap == aps[j])
return j;
return -1;
} private void assembleActionPanels() {
String[] ids = { "level 1", "level 2", "level 3", "level 4" };
aps = new ActionPanel[ids.length];
for (int j = 0; j < aps.length; j++)
aps[j] = new ActionPanel(ids[j], this);
} private void assemblePanels() {
GridBagConstraints gbc = new GridBagConstraints();
gbc.insets = new Insets(2, 1, 2, 1);
gbc.weightx = 1.0;
gbc.weighty = 1.0;
JPanel p1 = new JPanel(new GridBagLayout());
gbc.gridwidth = gbc.RELATIVE;
p1.add(new JButton("button 1"), gbc);
gbc.gridwidth = gbc.REMAINDER;
p1.add(new JButton("button 2"), gbc);
gbc.gridwidth = gbc.RELATIVE;
p1.add(new JButton("button 3"), gbc);
gbc.gridwidth = gbc.REMAINDER;
p1.add(new JButton("button 4"), gbc);
JPanel p2 = new JPanel(new GridBagLayout());
gbc.gridwidth = 1;
gbc.anchor = gbc.EAST;
p2.add(new JLabel("enter"), gbc);
gbc.anchor = gbc.WEST;
p2.add(new JTextField(8), gbc);
gbc.anchor = gbc.CENTER;
p2.add(new JButton("button 1"), gbc);
gbc.gridwidth = gbc.REMAINDER;
p2.add(new JButton("button 2"), gbc);
JPanel p3 = new JPanel(new BorderLayout());
JTextArea textArea = new JTextArea(8, 12);
textArea.setLineWrap(true);
p3.add(new JScrollPane(textArea));
JPanel p4 = new JPanel(new GridBagLayout());
addComponents(new JLabel("label 1"), new JTextField(12), p4, gbc);
addComponents(new JLabel("label 2"), new JTextField(16), p4, gbc);
gbc.gridwidth = 2;
gbc.gridy = 2;
p4.add(new JSlider(), gbc);
gbc.gridy++;
JPanel p5 = new JPanel(new GridBagLayout());
p5.add(new JButton("button 1"), gbc);
p5.add(new JButton("button 2"), gbc);
p5.add(new JButton("button 3"), gbc);
p5.add(new JButton("button 4"), gbc);
gbc.weighty = 1.0;
gbc.fill = gbc.BOTH;
p4.add(p5, gbc);
panels = new JPanel[] { p1, p2, p3, p4 };
} private void addComponents(Component c1, Component c2, Container c,
GridBagConstraints gbc) {
gbc.anchor = gbc.EAST;
gbc.gridwidth = gbc.RELATIVE;
c.add(c1, gbc);
gbc.anchor = gbc.WEST;
gbc.gridwidth = gbc.REMAINDER;
c.add(c2, gbc);
gbc.anchor = gbc.CENTER;
} private JPanel getComponent() {
JPanel panel = new JPanel(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.insets = new Insets(1, 3, 0, 3);
gbc.weightx = 1.0;
gbc.fill = gbc.HORIZONTAL;
gbc.gridwidth = gbc.REMAINDER;
for (int j = 0; j < aps.length; j++) {
panel.add(aps[j], gbc);
panel.add(panels[j], gbc);
panels[j].setVisible(false);
}
JLabel padding = new JLabel();
gbc.weighty = 1.0;
panel.add(padding, gbc);
return panel;
} public static void main(String[] args) {
ExpandingPanels test = new ExpandingPanels();
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.getContentPane().add(new JScrollPane(test.getComponent()));
f.setSize(360, 500);
f.setLocation(200, 100);
f.setVisible(true);
}
}class ActionPanel extends JPanel {
String text;
Font font;
private boolean selected;
BufferedImage open, closed;
Rectangle target;
final int OFFSET = 30, PAD = 5; public ActionPanel(String text, MouseListener ml) {
this.text = text;
addMouseListener(ml);
font = new Font("sans-serif", Font.PLAIN, 12);
selected = false;
setBackground(new Color(200, 200, 220));
setPreferredSize(new Dimension(200, 20));
setBorder(BorderFactory.createRaisedBevelBorder());
setPreferredSize(new Dimension(200, 20));
createImages();
setRequestFocusEnabled(true);
} public void toggleSelection() {
selected = !selected;
repaint();
} protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2 = (Graphics2D) g;
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
int w = getWidth();
int h = getHeight();
if (selected)
g2.drawImage(open, PAD, 0, this);
else
g2.drawImage(closed, PAD, 0, this);
g2.setFont(font);
FontRenderContext frc = g2.getFontRenderContext();
LineMetrics lm = font.getLineMetrics(text, frc);
float height = lm.getAscent() + lm.getDescent();
float x = OFFSET;
float y = (h + height) / 2 - lm.getDescent();
g2.drawString(text, x, y);
} private void createImages() {
int w = 20;
int h = getPreferredSize().height;
target = new Rectangle(2, 0, 20, 18);
open = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
Graphics2D g2 = open.createGraphics();
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g2.setPaint(getBackground());
g2.fillRect(0, 0, w, h);
int[] x = { 2, w / 2, 18 };
int[] y = { 4, 15, 4 };
Polygon p = new Polygon(x, y, 3);
g2.setPaint(Color.green.brighter());
g2.fill(p);
g2.setPaint(Color.blue.brighter());
g2.draw(p);
g2.dispose();
closed = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
g2 = closed.createGraphics();
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g2.setPaint(getBackground());
g2.fillRect(0, 0, w, h);
x = new int[] { 3, 13, 3 };
y = new int[] { 4, h / 2, 16 };
p = new Polygon(x, y, 3);
g2.setPaint(Color.red);
g2.fill(p);
g2.setPaint(Color.blue.brighter());
g2.draw(p);
g2.dispose();
}
}