我正在开发一个桌面RPG的图形工具，它将显示一个网格并允许用户更改网格的线条（即边框） - 网格的每个方格都是一个jpanel - 只需点击一下老鼠。
我目前的代码是这些代码：
if(quadrant ==2)
{
setBorder(new CompoundBorder(getBorder(), new MatteBorder(0,0,3,0, Color.BLUE)));
}
如果在方形底部附近的点范围内单击鼠标，则底部边框将变为蓝色，其他边框将保持不变。此代码不起作用，因为它将新边框添加到旧边框。在随后点击底线时，蓝色边框将变得更高，因为新的蓝色边框位于前一个蓝色边框的顶部...直到方形填充为蓝色。最终目标是通过多次点击循环显示颜色 - 即，一次点击蓝色，两次点击绿色，三次点击将其恢复为默认黑色。
我的想法是创建一个新的自定义边框类，它接受getBorder（），但修改它以便一边没有边框。但我不知道如何实现这一目标。
已修改为添加完整代码：
TestGrid02类：
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.border.Border;
import javax.swing.border.MatteBorder;
public class TestGrid02 {
public static void main(String[] args) {
new TestGrid02();
}
public TestGrid02() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
}
TestPane类：
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.border.Border;
import javax.swing.border.MatteBorder;
public class TestPane extends JPanel {
Border border = null;
public TestPane() {
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
for (int row = 0; row < 10; row++) {
for (int col = 0; col < 10; col++) {
gbc.gridx = col;
gbc.gridy = row;
CellPane cellPane = new CellPane();
if (row < 9) {
if (col < 9) {
border = new MatteBorder(1, 1, 0, 0, Color.BLACK);
} else {
border = new MatteBorder(1, 1, 0, 1, Color.BLACK);
}
} else {
if (col < 9) {
border = new MatteBorder(1, 1, 1, 0, Color.BLACK);
} else {
border = new MatteBorder(1, 1, 1, 1, Color.BLACK);
}
}
cellPane.setBorder(border);
cellPane.setBackground(Color.WHITE);
add(cellPane, gbc);
}
}
}
}
CellPane类：
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.border.Border;
import javax.swing.*;
import javax.swing.border.*;
import java.awt.*;
public class CellPane extends JPanel {
public CellPane() {
addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent e) {
Point p = e.getPoint();
int quadrant = 0;
if((p.x >= 0 && p.x <11) && p.y >= 0 && p.y < 41)
{
quadrant = 1;
}
else if((p.x >= 0 && p.x <41) && p.y >= 40)
{
quadrant = 2;
}
else if((p.x >= 10 && p.x <51) && p.y < 11)
{
quadrant = 3;
}
else if((p.x >40 && p.y >10))
{
quadrant = 4;
}
else
{
quadrant = 5;
}
if(e.getButton()== MouseEvent.BUTTON1)
{
if(quadrant==1)
{
Border border = getBorder();
if (border instanceof CompoundBorder) {
border = ((CompoundBorder)border).getOutsideBorder();
}
setBorder(new CompoundBorder(border, new MatteBorder(0,3,0,0, Color.BLUE)));
}
if(quadrant ==2)
{
Border border = getBorder();
if (border instanceof CompoundBorder) {
border = ((CompoundBorder)border).getOutsideBorder();
}
setBorder(new CompoundBorder(border, new MatteBorder(0,0,3,0, Color.BLUE)));
}
if(quadrant ==3)
{
Border border = getBorder();
if (border instanceof CompoundBorder) {
border = ((CompoundBorder)border).getOutsideBorder();
}
setBorder(new CompoundBorder(border, new MatteBorder(3,0,0,0, Color.BLUE)));
}
if(quadrant == 4)
{
Border border = getBorder();
if (border instanceof CompoundBorder) {
border = ((CompoundBorder)border).getOutsideBorder();
}
setBorder(new CompoundBorder(border, new MatteBorder(0,0,0,3, Color.BLUE)));
}
//original code. These borders "grow" on subsequent clicks
/*
if(quadrant==1)
{
setBorder(new CompoundBorder(getBorder(), new MatteBorder(0,3,0,0, Color.BLUE)));
}
if(quadrant ==2)
{
setBorder(new CompoundBorder(getBorder(), new MatteBorder(0,0,3,0, Color.BLUE)));
}
if(quadrant ==3)
{
setBorder(new CompoundBorder(getBorder(), new MatteBorder(3,0,0,0, Color.BLUE)));
}
if(quadrant == 4)
{
setBorder(new CompoundBorder(getBorder(), new MatteBorder(0,0,0,3, Color.BLUE)));
}
*/
if(quadrant == 5)
{
//setBorder(new MatteBorder(3,3,3,3, Color.BLUE)); //Click in the middle to highlight all sides of a square
}
}
}
});
}
@Override
public Dimension getPreferredSize() {
return new Dimension(50, 50);
}
}
答案 0 :(得分：1)
基本上，您需要检查Border并确定它是什么类型并从那里做出选择......
Border border = getBorder();
if (border instanceof CompoundBorder) {
border = ((CompoundBorder)border).getOutsideBorder();
}
setBorder(new CompoundBorder(border, new MatteBorder(0,0,3,0, Color.BLUE)));
基本上，这会检查border是否已经是CompoundBorder并抓住外边框（如果是）。然后，它会使用现有的外部Border和新的MatteBorder ...
虽然这不是没有问题......
根据对问题的更改进行了更新
基本上，你需要的是一些方法来“记住”点击之前的状态，并保持那些不会改变的状态。
基本上，我所做的是Insets。当用户点击时，我会检查quadrant并相应地修改insets，然后更新Border
public class CellPane extends JPanel {
private Insets insets = new Insets(0, 0, 0, 0);
public CellPane() {
addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent e) {
Point p = e.getPoint();
int quadrant = 0;
if ((p.x >= 0 && p.x < 11) && p.y >= 0 && p.y < 41) {
quadrant = 1;
} else if ((p.x >= 0 && p.x < 41) && p.y >= 40) {
quadrant = 2;
} else if ((p.x >= 10 && p.x < 51) && p.y < 11) {
quadrant = 3;
} else if ((p.x > 40 && p.y > 10)) {
quadrant = 4;
} else {
quadrant = 5;
}
if (e.getButton() == MouseEvent.BUTTON1) {
if (quadrant == 1) {
System.out.println("Left");
insets.left = insets.left == 0 ? 3 : 0;
}
if (quadrant == 2) {
System.out.println("Bottom");
insets.bottom = insets.bottom == 0 ? 3 : 0;
}
if (quadrant == 3) {
System.out.println("Top");
insets.top = insets.top == 0 ? 3 : 0;
}
if (quadrant == 4) {
System.out.println("Right");
insets.right = insets.right == 0 ? 3 : 0;
}
Border border = getBorder();
if (border instanceof CompoundBorder) {
border = ((CompoundBorder) border).getOutsideBorder();
}
setBorder(new CompoundBorder(border, new MatteBorder(insets, Color.BLUE)));
if (quadrant == 5) {
//setBorder(new MatteBorder(3,3,3,3, Color.BLUE)); //Click in the middle to highlight all sides of a square
}
}
}
});
}
@Override
public Dimension getPreferredSize() {
return new Dimension(50, 50);
}
}