java swing make Pagination Next/Prev , Next button Forword Record 或 Prev goback on 按钮按下
java swing make Pagination Next/Prev , Next button Forword Record or Prev goback on button press
我正在为餐厅设计 swing 桌面应用程序，其中我需要菜单组前进或后退需要两个按钮 Next/Prev
只是我制作了 Next/Prev 前进或后退的按钮，这不能正常工作我的代码，比如制作分页按钮，我的菜单组不能正常工作。
following image screen shot
Global Variables
public Connection con;
public PreparedStatement pst;
public ResultSet rs;
int totalRecord;
private int pageIndex = 0;
int pageSize = 5;
int pageSize1 = 6;
Menu Group Function code
public void loadgroup(int category_id) {
// this.pageIndex1 = page;
try {
Connection con5 = connectionDB.conDb();
String s2 = "SELECT id, name,btn_color,text_color FROM `menu_group` where cat_id='" + category_id + "'";
PreparedStatement pst2 = con5.prepareStatement(s2);
ResultSet rs2 = pst2.executeQuery();
groupPnl.removeAll();
revalidate();
// Connection con4 = connectionDB.conDb();
// String test1 = "SELECT COUNT(*)as rowCounts from menu_group";
// PreparedStatement pst3 = con5.prepareStatement(test1);
// ResultSet rs3 = pst3.executeQuery();
// int dbss = rs3.getInt("rowCounts");
if (rs2.next() == false) {
groupPnl.removeAll();
groupPnl.revalidate();
groupPnl.repaint();
groupPnl.setVisible(false);
right.setVisible(false);
left.setVisible(false);
} else {
groupPnl.revalidate();
groupPnl.setVisible(true);
right.setVisible(true);
left.setVisible(true);
do {
// rs2.first();
String a1 = rs2.getString(2);
String a2 = rs2.getString(1);
int a3 = rs2.getInt("btn_color");
int a4 = rs2.getInt("text_color");
PosButton btn = new PosButton();
btn.setText(a1);
btn.setVerticalAlignment((int) JButton.CENTER_ALIGNMENT);
btn.applyComponentOrientation(getComponentOrientation());
btn.setFocusPainted(false);
btn.setFocusable(false);
btn.setRequestFocusEnabled(false);
btn.setMaximumSize(new Dimension(80, 80));
btn.setPreferredSize(new Dimension(40, 35));
btn.setMinimumSize(new Dimension(80, 80));
btn.setFocusPainted(true);
btn.setBorderPainted(true);
btn.setBackground(new Color(a3, true));
btn.setForeground(new Color(a4, true));
btn.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
btn.setSelected(true);
System.out.println(a1 + ":");
btn.isSelected();
int idss = Integer.parseInt(a2);
// loadbtn();
}
});
//String a2 = rs.getString(2);
btn.setHorizontalAlignment(SwingConstants.CENTER);
btn.setHorizontalTextPosition(AbstractButton.CENTER);
btn.setVerticalTextPosition(AbstractButton.BOTTOM);
groupPnl.add(btn);
groupPnl.repaint();
groupPnl.revalidate();
}while (rs2.next());
}
} catch (SQLException e) {
e.getStackTrace();
}
}
Next Button Event Code
try {
Connection con = connectionDB.conDb();
String sql = "select COUNT(id) as ids from menu_cat";
PreparedStatement pst = con.prepareStatement(sql);
ResultSet rs = pst.executeQuery();
while (rs.next()) {
gid.setText(rs.getString("ids"));
}
double ab = Double.parseDouble(gid.getText());
double sm = ab / pageSize1;
int ch = (int) sm;
if (ch >= pageIndex1) {
loadgroup(pageIndex1++);
System.out.println(pageIndex1++);
} else {
pageIndex1 = 0;
loadgroup(pageIndex1++);
//nxt.setEnabled(false);
// pageIndex = 0;
}
} catch (Exception e) {
System.out.println(e.getMessage());
}
Prev Button Event Required
pageIndex1 = 0;
loadPage(pageIndex1--);
nxt.setEnabled(true);
Menu Category Load
private void loadPage(int page) {
this.pageIndex = page;
try {
// Customize page size here
Connection con = (Connection) connectionDB.conDb();
String sl = "SELECT id , name,translated_name ,btn_color,text_color FROM `menu_cat` LIMIT ? OFFSET ? ";
PreparedStatement pst = (PreparedStatement) con.prepareStatement(sl);
pst.setInt(1, pageSize);
pst.setInt(2, pageSize * page);
ResultSet rs = pst.executeQuery();
cat_panel.removeAll();
while (rs.next()) {
totalRecord = rs.getInt(1);
String a1 = rs.getString("name");
int getid = rs.getInt(1);
String a00 = rs.getString("translated_name");
int a3 = rs.getInt("BTN_COLOR");
int a4 = rs.getInt("text_COLOR");
PosButton btn = new PosButton();
btn.setText("<html><body><center><p>" + a1 + "</center><p>" + getid + "</p></body></html>");
btn.setVerticalAlignment((int) CENTER_ALIGNMENT);
btn.applyComponentOrientation(getComponentOrientation());
btn.setFocusPainted(false);
btn.setFocusable(false);
btn.setToolTipText(a00);
btn.setRequestFocusEnabled(false);
btn.setMaximumSize(new Dimension(80, 80));
btn.setPreferredSize(new Dimension(60, 60));
btn.setMinimumSize(new Dimension(80, 80));
btn.setBackground(new Color(a3, true));
btn.setForeground(new Color(a4, true));
btn.setFocusPainted(true);
btn.setBorderPainted(true);
btn.setSelected(true);
//String a2 = rs.getString(2);
btn.setHorizontalAlignment(SwingConstants.CENTER);
btn.setHorizontalTextPosition(AbstractButton.CENTER);
btn.setVerticalTextPosition(AbstractButton.BOTTOM);
// cat_panel.setLayout(new MigLayout("fill, wrap 1 0"));
// cat_panel = new JPanel(new MigLayout("fill, wrap 1, insets 0"));
btn.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
btn.setSelected(true);
btn.isSelected();
loadgroup(getid);
//loadgroupss(getid);
System.out.println(a1 + ":\t");
}
});
cat_panel.add(btn, "center");
//add(cat_panel, "grow y");
cat_panel.repaint();
cat_panel.revalidate();
}
} catch (SQLException e) {
}
}
当您需要学习新东西或修复无法按预期工作的东西时，在较小的规模上进行通常比在您的应用程序上进行要容易得多。
这符合在询问或回答时发布 mre 的 SO 要求。
您的问题本质上是如何更改容器中的 JPanels，下面的代码仅演示了这一点，仅此而已：
import java.awt.*;
import javax.swing.*;
public class CardLayoutPrevNextDemo extends JPanel {
private final CardLayout cLayout;
private final JPanel cardsPane;
private static int MAX_PAGES = 5;
private int topPageIndex = 0;
public CardLayoutPrevNextDemo(){
cardsPane = new JPanel();
cLayout = new CardLayout();
cardsPane.setLayout(cLayout);
addPages();
changePane();
JButton prevPage = new JButton("Prev");
prevPage.addActionListener(e -> showPrevPane());
JButton nextPage = new JButton("Next");
nextPage.addActionListener(e -> showNextPane());
JPanel buttonsPane = new JPanel(new BorderLayout());
buttonsPane.add(prevPage,BorderLayout.WEST);
buttonsPane.add(nextPage,BorderLayout.EAST);
setLayout(new BorderLayout());
add(cardsPane,BorderLayout.CENTER);
add(buttonsPane,BorderLayout.NORTH);
}
private void addPages() {
for(int i = 0; i < MAX_PAGES ; i++){
JPanel pane = new JPanel();
String pageName = String.valueOf(i);
setPreferredSize(new Dimension(400,200));
pane.add(new JLabel("Page # "+pageName));
cardsPane.add(pageName, pane);
}
}
void showNextPane() {
topPageIndex = topPageIndex + 1 >= MAX_PAGES ? 0: topPageIndex + 1;
changePane();
}
void showPrevPane() {
topPageIndex = topPageIndex - 1 < 0 ? MAX_PAGES -1 : topPageIndex - 1;
changePane();
}
void changePane() {
cLayout.show(cardsPane, String.valueOf(topPageIndex));
}
public static void main(String[] args) {
JFrame frame = new JFrame("Card Layout Prev Next Demo");
frame.setSize(400,250);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocationByPlatform(true);
frame.add(new CardLayoutPrevNextDemo());
frame.pack();
frame.setVisible(true);
}
}
我正在为餐厅设计 swing 桌面应用程序，其中我需要菜单组前进或后退需要两个按钮 Next/Prev 只是我制作了 Next/Prev 前进或后退的按钮，这不能正常工作我的代码，比如制作分页按钮，我的菜单组不能正常工作。
following image screen shot
Global Variables
public Connection con;
public PreparedStatement pst;
public ResultSet rs;
int totalRecord;
private int pageIndex = 0;
int pageSize = 5;
int pageSize1 = 6;
Menu Group Function code
public void loadgroup(int category_id) {
// this.pageIndex1 = page;
try {
Connection con5 = connectionDB.conDb();
String s2 = "SELECT id, name,btn_color,text_color FROM `menu_group` where cat_id='" + category_id + "'";
PreparedStatement pst2 = con5.prepareStatement(s2);
ResultSet rs2 = pst2.executeQuery();
groupPnl.removeAll();
revalidate();
// Connection con4 = connectionDB.conDb();
// String test1 = "SELECT COUNT(*)as rowCounts from menu_group";
// PreparedStatement pst3 = con5.prepareStatement(test1);
// ResultSet rs3 = pst3.executeQuery();
// int dbss = rs3.getInt("rowCounts");
if (rs2.next() == false) {
groupPnl.removeAll();
groupPnl.revalidate();
groupPnl.repaint();
groupPnl.setVisible(false);
right.setVisible(false);
left.setVisible(false);
} else {
groupPnl.revalidate();
groupPnl.setVisible(true);
right.setVisible(true);
left.setVisible(true);
do {
// rs2.first();
String a1 = rs2.getString(2);
String a2 = rs2.getString(1);
int a3 = rs2.getInt("btn_color");
int a4 = rs2.getInt("text_color");
PosButton btn = new PosButton();
btn.setText(a1);
btn.setVerticalAlignment((int) JButton.CENTER_ALIGNMENT);
btn.applyComponentOrientation(getComponentOrientation());
btn.setFocusPainted(false);
btn.setFocusable(false);
btn.setRequestFocusEnabled(false);
btn.setMaximumSize(new Dimension(80, 80));
btn.setPreferredSize(new Dimension(40, 35));
btn.setMinimumSize(new Dimension(80, 80));
btn.setFocusPainted(true);
btn.setBorderPainted(true);
btn.setBackground(new Color(a3, true));
btn.setForeground(new Color(a4, true));
btn.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
btn.setSelected(true);
System.out.println(a1 + ":");
btn.isSelected();
int idss = Integer.parseInt(a2);
// loadbtn();
}
});
//String a2 = rs.getString(2);
btn.setHorizontalAlignment(SwingConstants.CENTER);
btn.setHorizontalTextPosition(AbstractButton.CENTER);
btn.setVerticalTextPosition(AbstractButton.BOTTOM);
groupPnl.add(btn);
groupPnl.repaint();
groupPnl.revalidate();
}while (rs2.next());
}
} catch (SQLException e) {
e.getStackTrace();
}
}
Next Button Event Code
try {
Connection con = connectionDB.conDb();
String sql = "select COUNT(id) as ids from menu_cat";
PreparedStatement pst = con.prepareStatement(sql);
ResultSet rs = pst.executeQuery();
while (rs.next()) {
gid.setText(rs.getString("ids"));
}
double ab = Double.parseDouble(gid.getText());
double sm = ab / pageSize1;
int ch = (int) sm;
if (ch >= pageIndex1) {
loadgroup(pageIndex1++);
System.out.println(pageIndex1++);
} else {
pageIndex1 = 0;
loadgroup(pageIndex1++);
//nxt.setEnabled(false);
// pageIndex = 0;
}
} catch (Exception e) {
System.out.println(e.getMessage());
}
Prev Button Event Required
pageIndex1 = 0;
loadPage(pageIndex1--);
nxt.setEnabled(true);
Menu Category Load
private void loadPage(int page) {
this.pageIndex = page;
try {
// Customize page size here
Connection con = (Connection) connectionDB.conDb();
String sl = "SELECT id , name,translated_name ,btn_color,text_color FROM `menu_cat` LIMIT ? OFFSET ? ";
PreparedStatement pst = (PreparedStatement) con.prepareStatement(sl);
pst.setInt(1, pageSize);
pst.setInt(2, pageSize * page);
ResultSet rs = pst.executeQuery();
cat_panel.removeAll();
while (rs.next()) {
totalRecord = rs.getInt(1);
String a1 = rs.getString("name");
int getid = rs.getInt(1);
String a00 = rs.getString("translated_name");
int a3 = rs.getInt("BTN_COLOR");
int a4 = rs.getInt("text_COLOR");
PosButton btn = new PosButton();
btn.setText("<html><body><center><p>" + a1 + "</center><p>" + getid + "</p></body></html>");
btn.setVerticalAlignment((int) CENTER_ALIGNMENT);
btn.applyComponentOrientation(getComponentOrientation());
btn.setFocusPainted(false);
btn.setFocusable(false);
btn.setToolTipText(a00);
btn.setRequestFocusEnabled(false);
btn.setMaximumSize(new Dimension(80, 80));
btn.setPreferredSize(new Dimension(60, 60));
btn.setMinimumSize(new Dimension(80, 80));
btn.setBackground(new Color(a3, true));
btn.setForeground(new Color(a4, true));
btn.setFocusPainted(true);
btn.setBorderPainted(true);
btn.setSelected(true);
//String a2 = rs.getString(2);
btn.setHorizontalAlignment(SwingConstants.CENTER);
btn.setHorizontalTextPosition(AbstractButton.CENTER);
btn.setVerticalTextPosition(AbstractButton.BOTTOM);
// cat_panel.setLayout(new MigLayout("fill, wrap 1 0"));
// cat_panel = new JPanel(new MigLayout("fill, wrap 1, insets 0"));
btn.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
btn.setSelected(true);
btn.isSelected();
loadgroup(getid);
//loadgroupss(getid);
System.out.println(a1 + ":\t");
}
});
cat_panel.add(btn, "center");
//add(cat_panel, "grow y");
cat_panel.repaint();
cat_panel.revalidate();
}
} catch (SQLException e) {
}
}
当您需要学习新东西或修复无法按预期工作的东西时，在较小的规模上进行通常比在您的应用程序上进行要容易得多。
这符合在询问或回答时发布 mre 的 SO 要求。
您的问题本质上是如何更改容器中的 JPanels，下面的代码仅演示了这一点，仅此而已：
import java.awt.*;
import javax.swing.*;
public class CardLayoutPrevNextDemo extends JPanel {
private final CardLayout cLayout;
private final JPanel cardsPane;
private static int MAX_PAGES = 5;
private int topPageIndex = 0;
public CardLayoutPrevNextDemo(){
cardsPane = new JPanel();
cLayout = new CardLayout();
cardsPane.setLayout(cLayout);
addPages();
changePane();
JButton prevPage = new JButton("Prev");
prevPage.addActionListener(e -> showPrevPane());
JButton nextPage = new JButton("Next");
nextPage.addActionListener(e -> showNextPane());
JPanel buttonsPane = new JPanel(new BorderLayout());
buttonsPane.add(prevPage,BorderLayout.WEST);
buttonsPane.add(nextPage,BorderLayout.EAST);
setLayout(new BorderLayout());
add(cardsPane,BorderLayout.CENTER);
add(buttonsPane,BorderLayout.NORTH);
}
private void addPages() {
for(int i = 0; i < MAX_PAGES ; i++){
JPanel pane = new JPanel();
String pageName = String.valueOf(i);
setPreferredSize(new Dimension(400,200));
pane.add(new JLabel("Page # "+pageName));
cardsPane.add(pageName, pane);
}
}
void showNextPane() {
topPageIndex = topPageIndex + 1 >= MAX_PAGES ? 0: topPageIndex + 1;
changePane();
}
void showPrevPane() {
topPageIndex = topPageIndex - 1 < 0 ? MAX_PAGES -1 : topPageIndex - 1;
changePane();
}
void changePane() {
cLayout.show(cardsPane, String.valueOf(topPageIndex));
}
public static void main(String[] args) {
JFrame frame = new JFrame("Card Layout Prev Next Demo");
frame.setSize(400,250);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocationByPlatform(true);
frame.add(new CardLayoutPrevNextDemo());
frame.pack();
frame.setVisible(true);
}
}