ScrollPane添加到网格布局 [英] ScrollPane adding to grid layout
问题描述
在我的代码中，我要调用几个项目(我的按钮及其名称导致不同的项目.名称和所有内容均来自数据库) 我想要一个J ScrollPane包围我的按钮，我该怎么办?我只希望在滚动窗格内调用按钮.这是我的代码
in my code I am calling a few items(my buttons with their names leading to different project. The names and everything are taken from a database) I want a J ScrollPane to surround my buttons, what can I do? I just want the buttons to be called inside the scroll pane. Here is my code
import java.sql.*;
import java.util.ArrayList;
import java.util.List;
import java.awt.GridLayout;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JLabel;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
public class AdminClass implements ActionListener {
ProjectButton[] buttons = new ProjectButton[35];
//Creating data field for unique Ids in the form of array list
ArrayList<Integer> uniqueIDList = new ArrayList<Integer>();
String[] projectNames;
int[] uniqueIds;
Connection conn1 = null;
Statement stmt1 = null;
JFrame frame = new JFrame("Admin Panel");
private JPanel panel = new JPanel();
JButton btnNewButton = new JButton("Add New Project");
public AdminClass() {
panel.setLayout(new GridLayout(10, 1));
panel.add(new JLabel("Welcome to Admin Panel"));
btnNewButton.addActionListener(this);
panel.add(btnNewButton);
panel.add(new JLabel("Existing Projects"));
conn1 = sqliteConnection.dbConnector();
try{
Class.forName("org.sqlite.JDBC");
conn1.setAutoCommit(false);
stmt1 = conn1.createStatement();
ResultSet rs1 = stmt1.executeQuery( "SELECT * FROM Project;" );
List<String> projectNameList = new ArrayList<String>();
while ( rs1.next() ){
int id = rs1.getInt("uniqueid");
String projectName = rs1.getString("name");
projectNameList.add(projectName);
uniqueIDList.add(id);
}
// Converting array list to array
projectNames = new String[projectNameList.size()];
projectNameList.toArray(projectNames);
uniqueIds = convertIntegers(uniqueIDList);
rs1.close();
stmt1.close();
conn1.close();
}
catch ( Exception e1 ) {
JOptionPane.showMessageDialog(null, e1);
}
// Adding buttons to the project
try{
for (int i = 0; i < projectNames.length; i++){
buttons[i] = new ProjectButton(projectNames[i]);
buttons[i].setId(uniqueIds[i]);
panel.add(buttons[i]);
buttons[i].addActionListener(this);
}
}
catch (Exception e2){
JOptionPane.showMessageDialog(null, e2);
}
frame.add(panel);
frame.setVisible(true);
frame.setSize(500, 500);
}
public void actionPerformed(ActionEvent e) {
for (int j = 0; j < buttons.length; j ++){
if (e.getSource() == buttons[j]){
AdminStatus sc = new AdminStatus(buttons[j].getId());
frame.dispose();
}
}
if (e.getSource() == btnNewButton){
frame.dispose();
WindowProjectAdmin wpa = new WindowProjectAdmin();
}
}
//Method to convert integar array list to integar array
public int[] convertIntegers(List<Integer> integers)
{
int[] ret = new int[integers.size()];
for (int i=0; i < ret.length; i++)
{
ret[i] = integers.get(i).intValue();
}
return ret;
}
}
这似乎很正常，但实际上并非如此，由于某些原因，它们不可见或未在滚动条中调用.也许请编辑我的代码?
This may seem very normal but it's really not, for some reason they are not visible or are not called inside a scroller. Please edit my code maybe?
推荐答案
首先将按钮添加到其自己的容器中，这样您就可以独立于UI的其余部分来控制按钮的布局
Start by adding the buttons to their own container, this way you can control the layout of the buttons separately from the rest of the UI
JPanel panelFullOfButtons = new JPanel();
try {
for (int i = 0; i < projectNames.length; i++) {
buttons[i] = new ProjectButton(projectNames[i]);
buttons[i].setId(uniqueIds[i]);
panelFullOfButtons.add(buttons[i]);
buttons[i].addActionListener(this);
}
} catch (Exception e2) {
JOptionPane.showMessageDialog(null, e2);
}
然后将主"面板添加到框架的NORTH位置，并将按钮"面板添加到CENTER
Then add the "main" panel to the NORTH position of the frame and the "buttons" panel to the CENTER
frame.add(panel, BorderLayout.NORTH);
frame.add(new JScrollPane(panelFullOfButtons), BorderLayout.CENTER);
在这种情况下，请介意，我很想改用JList之类的东西.有关更多详细信息，请参见如何使用列表
Mind you, in this case, I'd be very tempted to use something like a JList instead. See How to Use Lists for more details
我也做了同样的事情，你能告诉我怎么了吗?
I have done the same, can you tell me what's wrong?
// Problem #1...
JScrollPane pane = new JScrollPane();
pane.add(buttonPanel);
//...
// Problem #2...
panel.add(pane);
frame.add(panel);
这些彼此竞争，将内容四处移动并与现有内容重叠...
These are competing with each other, moving the content around and overlapping with existing content...
public AdminClass() {
panel.setLayout(new GridLayout(3, 1));
panel.add(new JLabel("Welcome to Admin Panel"));
btnNewButton.addActionListener(this);
panel.add(btnNewButton);
panel.add(new JLabel("Existing Projects"));
List<String> projectNameList = new ArrayList<String>();
for (int index = 0; index < 1000; index++) {
projectNameList.add("Project " + index);
}
projectNames = projectNameList.toArray(new String[0]);
// Adding buttons to the project
buttons = new JButton[projectNameList.size()];
try {
for (int i = 0; i < projectNames.length; i++) {
buttons[i] = new JButton(projectNames[i]);
btnPnl1.add(buttons[i]);
buttons[i].addActionListener(this);
}
} catch (Exception e2) {
JOptionPane.showMessageDialog(null, e2);
}
frame.add(panel, BorderLayout.NORTH);
frame.add(new JScrollPane(btnPnl1), BorderLayout.CENTER);
frame.setVisible(true);
frame.setSize(500, 500);
}
在这种情况下，我更愿意使用JList来显示项目或使用 WrapLayout 用于布置按钮
In this case I'd prefer to use either a JList to show the projects or a WrapLayout for laying out the buttons
这篇关于ScrollPane添加到网格布局的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
