[英]How to properly use the MouseMotionListener to press JButtons?
我制作了一个小型的Conway Game of Life计划。 我完成了大约80%。 我使用了一个JButtons
网格作为单元格。 现在我在每个按钮上都有一个ButtonListener
,所以你必须通过单击各个按钮逐个绘制你想要的模式。 我希望能够单击并拖动鼠标并快速选择按钮。 我使用了MotionListener
类,实现了MouseMotionListener
并以与ButtonListener
类中的actionPerformed
方法相同的方式编写了mouseDragged
方法。
我认为逻辑应该是相同的,但我肯定错过了一些东西。 我玩了一下,认为它只是比我能说的更快地选择和取消选择。 我添加了一个检查,以确保它没有尝试连续更改相同的按钮,但这没有帮助。 这是我的MotionListener
类:
class MotionListener implements MouseMotionListener {
@Override
public void mouseDragged(MouseEvent e) {
for (int i = 0; i < size; i++) {
for (int j = 0; j < size; j++) {
if (e.getSource() == squares[i][j]) {
if (litSquares[i][j] == false) {
squares[i][j].setBackground(selected);
litSquares[i][j] = true;
} else {
squares[i][j].setBackground(backGround);
litSquares[i][j] = false;
}
}
}
}
}
@Override
public void mouseMoved(MouseEvent e) {
// TODO Auto-generated method stub
}
}
我的JButton阵列是squares[][]
和litSquares[][]
是什么是当前所选的一个布尔地图,我计算下一个步骤时使用。
关于如何纠正我的MotionListener
任何想法? 我不了解如何正确实现这个类。 我发现的所有简单示例都涉及绘图,但它们似乎都跟踪拖动光标的Points
并在之后更新像素。 这是我用按钮以某种方式做的事情吗?
*****这是MCVE,或者至少可以缩小它。 *****
package extraCredit;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;
import javax.swing.*;
import javax.swing.border.Border;
public class MCVE extends JPanel {
private static final long serialVersionUID = -8031881678612431401L;
static JFrame frame;
static JPanel grid;
static JButton[][] squares;
static boolean[][] litSquares, boardCopy;
static int size, boardSize, tick = 1, goal = 100, rateIncrease = 10;
ButtonListener listener = new ButtonListener();
MotionListener mListerner = new MotionListener();
Border noBorder = BorderFactory.createEmptyBorder();
Color backGround = Color.BLUE;
Color selected = Color.PINK;
public MCVE(int size) {
MCVE.size = size;
squares = new JButton[size][size];
litSquares = new boolean[size][size];
grid = new JPanel(new GridLayout(size, size));
for (int i = 0; i < size; i++) {
for (int j = 0; j < size; j++) {
squares[i][j] = new JButton();
squares[i][j].addActionListener(listener);
// squares[i][j].addMouseMotionListener(mListerner);
squares[i][j].setBackground(backGround);
squares[i][j].setBorder(noBorder);
grid.add(squares[i][j]);
}
}
frame = new JFrame();
frame.setLayout(new BorderLayout());
frame.add(grid, BorderLayout.CENTER);
frame.setTitle("Life");
if (25 * size < 525) {
boardSize = 525;
} else {
boardSize = 25 * size;
}
frame.setSize(boardSize, boardSize);
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
class ButtonListener implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
for (int i = 0; i < size; i++) {
for (int j = 0; j < size; j++) {
if (e.getSource() == squares[i][j]) {
if (litSquares[i][j] == false) {
squares[i][j].setBackground(selected);
litSquares[i][j] = true;
} else {
squares[i][j].setBackground(backGround);
litSquares[i][j] = false;
}
}
}
}
}
}
class MotionListener implements MouseMotionListener {
@Override
public void mouseDragged(MouseEvent e) {
for (int i = 0; i < size; i++) {
for (int j = 0; j < size; j++) {
if (e.getSource() == squares[i][j]) {
if (litSquares[i][j] == false) {
squares[i][j].setBackground(selected);
litSquares[i][j] = true;
} else {
squares[i][j].setBackground(backGround);
litSquares[i][j] = false;
}
}
}
}
}
@Override
public void mouseMoved(MouseEvent e) {
// TODO Auto-generated method stub
}
}
public static void main(String args[]) {
new MCVE(20);
}
}
以下解决方案 ,感谢@MadProgrammer和@ durron597。 Mad回答了我的另一个问题 ,这个问题让我感到很不舒服。
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.GridLayout;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.util.HashSet;
import java.util.Set;
import javax.swing.*;
public class ChangesAttempt extends JPanel {
private static final long serialVersionUID = -8031881678612431401L;
static JFrame frame;
static JPanel grid;
static JLabel[][] squares;
static boolean[][] litSquares;
static int size, boardSize;
static boolean startDrag, origin;
static Set<Component> compList = new HashSet<Component>();
MouseEvent listener = new MouseEvent();
MotionListener mListerner = new MotionListener();
Color backGround = Color.BLUE;
Color selected = Color.PINK;
public ChangesAttempt(int size) {
ChangesAttempt.size = size;
squares = new JLabel[size][size];
litSquares = new boolean[size][size];
grid = new JPanel(new GridLayout(size, size));
grid.addMouseMotionListener(mListerner);
grid.addMouseListener(listener);
setBoard();
frame = new JFrame();
frame.setLayout(new BorderLayout());
frame.add(grid, BorderLayout.CENTER);
frame.setTitle("ChangedLife");
if (25 * size < 525)
boardSize = 525;
else
boardSize = 25 * size;
frame.setSize(boardSize, boardSize);
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
class MouseEvent implements MouseListener {
@Override
public void mousePressed(java.awt.event.MouseEvent e) {
startDrag = true;
}
@Override
public void mouseClicked(java.awt.event.MouseEvent e) {
Component source = e.getComponent().getComponentAt(e.getPoint());
System.out.println("X = " +source.getX() + ", Y = " + source.getY());
for (int i = 0; i < size; i++) {
for (int j = 0; j < size; j++) {
if (source == squares[i][j]) {
if (litSquares[i][j] == false) {
squares[i][j].setBackground(selected);
litSquares[i][j] = true;
} else {
squares[i][j].setBackground(backGround);
litSquares[i][j] = false;
}
}
}
}
}
@Override
public void mouseEntered(java.awt.event.MouseEvent e) {
}
@Override
public void mouseExited(java.awt.event.MouseEvent e) {
}
@Override
public void mouseReleased(java.awt.event.MouseEvent e) {
compList.clear();
}
}
class MotionListener implements MouseMotionListener {
@Override
public void mouseDragged(java.awt.event.MouseEvent e) {
compList.add(e.getComponent().getComponentAt(e.getPoint()));
updateBoard();
}
@Override
public void mouseMoved(java.awt.event.MouseEvent e) {
}
}
public void setBoard() {
for (int i = 0; i < size; i++) {
for (int j = 0; j < size; j++) {
squares[i][j] = new JLabel();
squares[i][j].setOpaque(true);
squares[i][j].setBackground(backGround);
grid.add(squares[i][j]);
}
}
}
public void updateBoard(){
for (int i = 0; i < size; i++) {
for (int j = 0; j < size; j++) {
if (compList.contains(squares[i][j])) {
if(startDrag){
startDrag = false;
origin = litSquares[i][j];
}
if (litSquares[i][j] == origin) {
if(origin)
squares[i][j].setBackground(backGround);
else
squares[i][j].setBackground(selected);
litSquares[i][j] = !litSquares[i][j];
}
}
}
}
}
class MyLabel extends JLabel {
private static final long serialVersionUID = -1414933339546989142L;
}
public static void main(String args[]) {
new ChangesAttempt(20);
}
}
我认为你遇到的问题是你正试图将JButton
用于它不能做的事情。 我会使用更简单的控件,比如JLabel
,这样你就不会拥有JButton
具有的所有额外功能。
其次,你的litSquares
数组显然是一个Data Clump 。 您绝对应该创建自己的自定义控件(可以extend JComponent
或extend JLabel
),具体取决于JLabel
是否满足您的需求,其中包含应与控件本身配对的其他信息。
第三,你可能不希望按钮的状态是一个boolean
,你可能希望它是一个enum
...喜欢
public enum State {
UNLIT, LIT, CURRENTLY_SELECTED;
}
这样您就可以看到哪些组件正在进行新的颜色翻转。
最后,正如在注释中提到的那样,使用public Component getComponentAt(int x, int y)
能够找出拖动MouseMotionListener
,并使用它来更改颜色。
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