[英]After the button is clicked for the first time, the button stops working
我正在開發一個程序,如果單擊菜單項“顯示網格線”,菜單欄下方的繪圖區域將在網格上繪制網格線。
編輯:以下是程序的組件。 我把對這個問題不重要的任何部分都變成了評論。
import java.awt.Color;
import java.awt.Image;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
//main initializer
public class lineFollower {
frameDesign frame;
//private static Image icon = new ImageIcon("images/icon copy.jpg").getImage();
public static void main(String[] args) {
//make new frame
JFrame frame = new frameDesign();
frame.setSize(1000,700);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
frame.setLocale(null);
frame.setTitle("Line Follower Program 1.0");
//frame.setIconImage(icon);
}
}
這是框架設計(也省略了部分):
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.util.ArrayList;
import javax.swing.*;
public class frameDesign extends JFrame {
//data fields
//JPanel DataPanel;
//ListPanel ListPanel;
DrawingPanel DrawingPanel;
grid gridbox;
menuPanel menu;
//ArrayList<Rectangle> Rectangles;
//ArrayList<Circle> Circles;
//ArrayList<Triangle> Triangles;
public int newvalue = 0;
public int[] griddim;
public int gridwidth, gridheight;
BorderLayout layout;
//combine data into frame
public frameDesign(){
//Rectangles = new ArrayList<Rectangle>();
//Circles = new ArrayList<Circle>();
//Triangles = new ArrayList<Triangle>();
//Layout: Border
BorderLayout layout = new BorderLayout();
setLayout(layout);
//Assemble the Menu
menu = new menuPanel();
//Assemble the List Panel which also includes the animation buttons
//ListPanel = new ListPanel();
//Create the gridbox
gridbox = new grid();
gridbox.setPreferredSize(new Dimension(200,200));
gridbox.setSize(500,200);
griddim = gridbox.getgriddim();
gridwidth = griddim[0];
gridheight = griddim[1];
//Data Panel consists of ListPanel, AnimatePanel, and DrawingPanel
//DataPanel = new JPanel(new FlowLayout());
//DataPanel.add(DrawingPanel= new DrawingPanel());
//DataPanel.add(ListPanel = new ListPanel());
//DataPanel.setSize(250,700);
//DataPanel.setBackground(Color.getHSBColor(150f, 100f, 100f));
//DataPanel.setBorder(BorderFactory.createLineBorder(Color.BLACK, 5));
add(gridbox, BorderLayout.CENTER);
add(menu, BorderLayout.NORTH);
//add(DataPanel, BorderLayout.EAST);
//getPoints pointfinder = new getPoints();
//pointgrabber pointfinder2 = new pointgrabber();
//gridbox.addMouseListener(pointfinder2);
//gridbox.addMouseMotionListener(pointfinder);
//ActionListeners for Menus
menu.ShowLine.addActionListener(new ActionListener(){
@Override
public void actionPerformed(ActionEvent e){
//show the grid
if (gridbox.isgridline()==true){
gridbox.gridline(false);
}
else if (gridbox.isgridline()==false){
gridbox.gridline(true);
}
}
});
}
下一堆代碼用於創建網格:
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import javax.swing.BorderFactory;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
/*
* This is the design for the grid
*/
public class grid extends JPanel {
//data fields
boolean isgridline;
private static int startX = 50;
private static int startY = 50;
private int intervalline;
private int[] griddim;
//gridPanel
grid(){
setBorder(BorderFactory.createLineBorder(Color.BLACK));
griddim = new int[2];
griddim[0] = 500;
griddim[1] = 500;
isgridline = false;
intervalline = 20;
}
//Paints grid
@Override
protected void paintComponent(Graphics g){
super.paintComponent(g);
//GridBox
g.setColor(Color.BLACK);
g.drawRect(50, 50, griddim[0], griddim[1]);
g.setColor(Color.WHITE);
g.fillRect(50, 50, griddim[0], griddim[1]);
//draw grid lines
if (isgridline){
g.setColor(Color.getHSBColor(150, 150, 200));
//vertical lines
for (int v = 0; v <griddim[0]; v = v+intervalline){
g.drawLine(startX, 50,
startX, 50+griddim[1]);
startX = startX+intervalline;
}
//horizontal lines
for (int v=0; v<griddim[1]; v=v+intervalline){
g.drawLine(50, startY, 50+griddim[0], startY);
startY = startY+intervalline;
}
}
}
//set grid dimensions
public void setgridbox(int[] dim){
griddim=dim;
}
//get grid dimensions
public int[] getgriddim(){
return griddim;
}
//set the grid line true or false
public void gridline(boolean islines){
isgridline=islines;
repaint();
}
//get gridline true or false
public boolean isgridline(){
return isgridline;
}
//set grid line intervals
//public void setinterval(int interval){
//intervalline=interval;
//repaint();
//}
}
最后是菜單:
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.EventListener;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.event.MenuEvent;
/*
* Class just for the menu panel
*/
public class menuPanel extends JMenuBar {
JMenuItem New, Save, Open, Exit;
JMenu fileMenu, gridMenu;
JMenuItem GridDim, GridLine, ShowLine;
menuPanel(){
//Assemble file menu
fileMenu = new JMenu("File");
New = new JMenuItem("New");
Save = new JMenuItem("Save");
Open = new JMenuItem("Open");
Exit = new JMenuItem("Exit");
fileMenu.add(New);
fileMenu.add(Save);
fileMenu.add(Open);
fileMenu.addSeparator();
fileMenu.add(Exit);
add(fileMenu);
//Assemble grid menu
gridMenu = new JMenu("Grid");
GridDim = new JMenuItem("Dimension");
GridLine = new JMenuItem("Change Grid Line Interval");
ShowLine = new JMenuItem("Show Grid Lines");
gridMenu.add(GridDim);
gridMenu.add(GridLine);
gridMenu.add(ShowLine);
add(gridMenu);
}
}
單擊網格下菜單欄中的“顯示網格線”按鈕時,將打開網格線並關閉網格線一次。 在那之后它停止工作......我該怎么做才能使網格線不止一次地再次出現和關閉?
我做了一個非常快速的測試,但是因為您沒有為我們提供可運行的示例,所以不可能重現您的問題。
我“懷疑”的是您的for-loop
由於某種原因崩潰( griddim
為空或存在出界異常),這導致 EDT 變得不穩定。
除非您使用可重復、可運行的示例來啟發使用,否則我們永遠不會確定
public class TestGridLine {
public static void main(String[] args) {
new TestGridLine();
}
public TestGridLine() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new GridPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class GridPane extends JPanel {
private boolean gridline;
public GridPane() {
setLayout(new GridBagLayout());
JButton btn = new JButton("Grid");
btn.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
setGridLine(!isGridLine());
}
});
add(btn);
}
@Override
public Dimension getPreferredSize() {
return new Dimension(200, 200);
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
int width = getWidth() - 1;
int height = getHeight() - 1;
//GridBox
g.setColor(Color.BLACK);
g.drawRect(0, 0, width - 1, height - 1);
g.setColor(Color.WHITE);
g.fillRect(1, 1, width - 1, height - 1);
//draw grid lines
if (gridline) {
g.setColor(Color.getHSBColor(150, 150, 200));
//vertical lines
for (int v = 0; v < width - 2; v += 10) {
g.drawLine(v, 1, v, height - 2);
}
//horizontal lines
for (int v = 0; v < height - 2; v += 10) {
g.drawLine(1, v, width - 2, v);
}
}
}
//returns boolean gridline
public boolean isGridLine() {
return gridline;
}
//set the grid line true or false
public void setGridLine(boolean islines) {
if (islines != gridline) {
gridline = islines;
repaint();
}
}
}
}
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