我正在编写一个简单的应用程序,一个方程系统求解器。 它背后的基本思想是从用户那里获取系统中变量的数量,并动态创建那么多的 JTextFields,然后是一个按钮,以解决系统问题。
在我努力实现它的过程中,我正在努力设置垂直滚动条。
发生的事情是,在使用 JScrollPane 后布局变得一团糟。
我用过 this作为指南并尝试使用 VERTICAL_ALWAYS 和 HORIZONTAL_NEVER 以这种方式进行,但它不起作用。
控件是横向放置的,而不是从上到下一个接一个地放置。
如何实现?
public class SolverUserInterface implements ActionListener{
private JFrame solverUI;
private JPanel panel;
private JLabel lbl[];
private JTextField eq_Fields[];
public SolverUserInterface(int Count) {
// TODO Auto-generated constructor stub
solverUI = new JFrame("Solver");
solverUI.setSize(405, 137);
solverUI.setResizable(false);
Dimension dim = Toolkit.getDefaultToolkit().getScreenSize();
solverUI.setLocation(dim.width/2-solverUI.getSize().width/2, dim.height/2-solverUI.getSize().height/2);
solverUI.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
panel = new JPanel();
panel.setLayout(new FlowLayout());
lbl = new JLabel[Count];
eq_Fields = new JTextField[Count];
for(int i = 0; i < Count; i++){
lbl[i] = new JLabel("Equation "+(i+1)+" : ");
eq_Fields[i] = new JTextField(26);
panel.add(lbl[i]);
panel.add(eq_Fields[i]);
}
JButton btnSolve = new JButton("Solve Equations!");
panel.add(btnSolve);
btnSolve.addActionListener(this);
/*This is the part concerned*/
JScrollPane jp = new JScrollPane(panel, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
solverUI.add(jp);
solverUI.revalidate();
}
public void ShowUserInterface(){
solverUI.setVisible(true);
}
@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
}
}
最佳答案
根据您的尝试,这是一个更实用、更实用的 GUI。看一看。
import java.awt.*;
import javax.swing.*;
public class SolverUserInterface {
private JFrame solverUI;
private JPanel panel;
private JLabel lbl[];
private JTextField eq_Fields[];
public SolverUserInterface(int Count) {
solverUI = new JFrame("Solver");
solverUI.setLocationByPlatform(true);
solverUI.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
panel = new JPanel(new BorderLayout());
JPanel labels = new JPanel(new GridLayout(0,1,5,5));
JPanel fields = new JPanel(new GridLayout(0,1,5,5));
lbl = new JLabel[Count];
panel.add(labels, BorderLayout.LINE_START);
panel.add(fields, BorderLayout.CENTER);
eq_Fields = new JTextField[Count];
for(int i = 0; i < Count; i++){
lbl[i] = new JLabel("Equation "+(i+1)+" : ");
eq_Fields[i] = new JTextField(26);
labels.add(lbl[i]);
fields.add(eq_Fields[i]);
}
JButton btnSolve = new JButton("Solve Equations!");
solverUI.add(btnSolve, BorderLayout.PAGE_END);
JScrollPane jp = new JScrollPane(
panel,
JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
solverUI.add(jp);
solverUI.pack();
Dimension d = solverUI.getSize();
int w = (int)d.getWidth();
int h = (int)d.getHeight();
h = (h>200 ? 200 : h);
Dimension shrinkHeight = new Dimension(w,h);
solverUI.setSize(shrinkHeight);
}
public void showUserInterface(){
solverUI.setVisible(true);
}
public static void main(String[] args) {
Runnable r = new Runnable() {
@Override
public void run() {
SolverUserInterface sui = new SolverUserInterface(105);
sui.showUserInterface();
}
};
SwingUtilities.invokeLater(r);
}
}
Alright, and just one clarification about Pack(). When I use it, the size of the window grows with the increase in the number of fields, but thats not the case when I remove the Pack(). It seems using Pack() doesn't make sense while using the scroll bar.. Am I correct with this conclusion ?
有一点,但不完全是。
- 为了可靠地工作,GUI 应该被打包或验证。
- 框架打包后,将显示为显示组件所需的最小尺寸(除非它比屏幕尺寸高或宽)。
- ..但是我们可以采用打包尺寸,使用它给我们的宽度,并将高度设置得更短。
关于java - 使用 FLowLayout 制作垂直滚动的 JFrame,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/17341705/