Java GUI riverniciatura errore?
-
22-08-2019 - |
Domanda
Questo è un duro uno - ho un JFrame che genera JTextFields. Quando vado da generare 2 JTextFields a 12 JTextfields (per esempio), vedo qualche errore dove c'è un JTextField supplementare diversamente dimensioni alla fine. Sembra essere un errore di ridipingere.
Codice Main.java:
import java.awt.*;
import javax.swing.*;
public class Main {
public static Display display = new Display();
public static void main(String[] args) {
display.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
display.setVisible(true);
}
}
Display.java codice:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Display extends JFrame {
final int FRAME_WIDTH = 820;
final int FRAME_HEIGHT = 700;
final int X_OFFSET = 40;
final int Y_OFFSET = 40;
final int GRAPH_OFFSETX = 35;
final int GRAPH_OFFSETY = 60;
final int GRAPH_WIDTH = 500;
final int GRAPH_HEIGHT = 500;
final int GRAPH_INTERVAL = 20;
JButton submit;
JTextField top;
JTextField bottom;
JTextField numPoint;
JPanel bpanel;
JPanel points;
int maxPoints;
public Display() {
init();
}
public void init() {
setBackground(Color.WHITE);
setLocation(X_OFFSET, Y_OFFSET);
setSize(FRAME_WIDTH, FRAME_HEIGHT);
setTitle("Geometric Transformations");
getContentPane().setLayout(null);
setDefaultLookAndFeelDecorated(true);
top = new JTextField(); // parameter is size of input characters
top.setText("1 2 3");
top.setBounds(590, 150, 120, 25);
bottom = new JTextField(); // parameter is size of input characters
bottom.setText("5 6 7");
bottom.setBounds(590, 200, 120, 25);
numPoint = new JTextField();
numPoint.setText("Number of Points?");
numPoint.setBounds(550,200,200,25);
this.add(numPoint);
SubmitButton submit = new SubmitButton("Submit");
submit.setBounds(570, 250, 170, 25);
bpanel = new JPanel(new GridLayout(2,3));
bpanel.add(top);
bpanel.add(bottom);
bpanel.add(submit);
points = new JPanel(new GridLayout(2,2));
points.setBounds(540,250,265,60);
this.add(points);
bpanel.setBounds(550,100,200,70);
this.add(bpanel, BorderLayout.LINE_START);
Component[] a = points.getComponents();
System.out.println(a.length);
repaint();
}
public void paint(Graphics g) {
super.paint(g);
g.setColor(Color.WHITE);
g.fillRect(100, 100, 20, 30);
g.setColor(Color.BLACK);
genGraph(g, GRAPH_OFFSETX, GRAPH_OFFSETY, GRAPH_WIDTH, GRAPH_HEIGHT, GRAPH_INTERVAL);
}
public void genGraph (Graphics g, int x, int y, int width, int height, int interval) {
// draw background
int border = 5;
g.setColor(Color.BLACK);
width = width - (width % interval);
height = height - (height % interval);
for (int col=x; col <= x+width; col+=interval) {
g.drawLine(col, y, col, y+height);
}
for (int row=y; row <= y+height; row+=interval) {
g.drawLine(x, row, x+width, row);
}
}
class SubmitButton extends JButton implements ActionListener {
public SubmitButton(String title){
super(title);
addActionListener(this);
this.setVisible(true);
}
public void actionPerformed(ActionEvent e) {
maxPoints = Integer.parseInt(numPoint.getText()) * 2;
points.removeAll();
for (int i=0; i<maxPoints; i++) {
JTextField textField = new JTextField();
points.add(textField);
}
points.validate(); // necessary when adding components to a JPanel
// http://stackoverflow.com/questions/369823/java-gui-repaint-problem-solved
// What to Check:
// Things between commas are either spaces (which will be stripped later)
// or numbers!
// Pairs must match up!
}
}
}
Soluzione
I nuovi componenti vengono ridisegnate su quelli precedenti.
Ho aggiunto points.repaint();
dopo points.validate();
e il problema non c'era più.
Altri suggerimenti
Nota: Ero seccato con la questione della riverniciatura della griglia di troppo (mettere la finestra di fronte poi di nuovo, si vedrà)
.
Da una rapida ricerca, sembra meglio evitare di pittura direttamente sul JFrame, ma invece delegare che a un sub-componente. Se mi sbaglio, qualcuno mi dica.
Ecco la mia soluzione (imperfetta, lascio a voi il compito di migliorarla ... :-P
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class SODisplay extends JFrame {
final int FRAME_WIDTH = 820;
final int FRAME_HEIGHT = 700;
final int X_OFFSET = 40;
final int Y_OFFSET = 40;
JButton submit;
JTextField top;
JTextField bottom;
JTextField numPoint;
JPanel bpanel;
JPanel points;
GridPanel grid;
int maxPoints;
public SODisplay() {
init();
}
public void init() {
setBackground(Color.WHITE);
setLocation(X_OFFSET, Y_OFFSET);
setSize(FRAME_WIDTH, FRAME_HEIGHT);
setTitle("Geometric Transformations");
getContentPane().setLayout(null);
setDefaultLookAndFeelDecorated(true);
grid = new GridPanel();
grid.setBounds(0,0,530,FRAME_HEIGHT);
this.add(grid);
top = new JTextField(); // parameter is size of input characters
top.setText("1 2 3");
top.setBounds(590, 150, 120, 25);
bottom = new JTextField(); // parameter is size of input characters
bottom.setText("5 6 7");
bottom.setBounds(590, 200, 120, 25);
numPoint = new JTextField();
numPoint.setText("Number of Points?");
numPoint.setBounds(550,200,200,25);
this.add(numPoint);
SubmitButton submit = new SubmitButton("Submit");
submit.setBounds(570, 250, 170, 25);
bpanel = new JPanel(new GridLayout(2,3));
bpanel.add(top);
bpanel.add(bottom);
bpanel.add(submit);
points = new JPanel(new GridLayout(2,2));
points.setBounds(540,250,265,60);
this.add(points);
bpanel.setBounds(550,100,200,70);
this.add(bpanel, BorderLayout.LINE_START);
Component[] a = points.getComponents();
System.out.println(a.length);
repaint();
}
class SubmitButton extends JButton implements ActionListener {
public SubmitButton(String title){
super(title);
addActionListener(this);
this.setVisible(true);
}
public void actionPerformed(ActionEvent e) {
maxPoints = Integer.parseInt(numPoint.getText()) * 2;
points.removeAll();
for (int i=0; i<maxPoints; i++) {
JTextField textField = new JTextField();
points.add(textField);
}
points.validate(); // necessary when adding components to a JPanel
points.repaint();
// http://stackoverflow.com/questions/369823/java-gui-repaint-problem-solved
// What to Check:
// Things between commas are either spaces (which will be stripped later)
// or numbers!
// Pairs must match up!
}
}
public static void main(String[] args) {
// Schedule a job for the event-dispatching thread:
// creating and showing this application's GUI.
SwingUtilities.invokeLater(new Runnable()
{
public void run()
{
SODisplay display = new SODisplay();
display.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
display.setVisible(true);
}
});
}
class GridPanel extends JPanel {
// Or drop the offset and adjust the placement of the component
final int GRAPH_OFFSETX = 35;
final int GRAPH_OFFSETY = 60;
final int GRAPH_WIDTH = 500;
final int GRAPH_HEIGHT = 500;
final int GRAPH_INTERVAL = 20;
public GridPanel() {
}
public void paint(Graphics g) {
super.paint(g);
g.setColor(Color.WHITE);
g.fillRect(100, 100, 20, 30);
g.setColor(Color.BLACK);
genGraph(g, GRAPH_OFFSETX, GRAPH_OFFSETY, GRAPH_WIDTH, GRAPH_HEIGHT, GRAPH_INTERVAL);
}
public void genGraph (Graphics g, int x, int y, int width, int height, int interval) {
// draw background
int border = 5;
g.setColor(Color.BLACK);
width = width - (width % interval);
height = height - (height % interval);
for (int col=x; col <= x+width; col+=interval) {
g.drawLine(col, y, col, y+height);
}
for (int row=y; row <= y+height; row+=interval) {
g.drawLine(x, row, x+width, row);
}
}
}
}
Questo è solo il mio codice di prova in un unico file per semplicità, si potrebbe desiderare di sezionare in modo diverso, naturalmente.