我无法弄清楚为什么已经绘制的组件不会消失，因为我更新了Component的位置。 See picture here
只有底部正方形应该是可见的！ 这是我的自定义组件类（抱歉是德语）
package de.jakob.java.sitzplan.elements;
import java.awt.Graphics;
import javax.swing.JComponent;
import javax.swing.JFrame;
import de.jakob.java.sitzplan.utils.DrawUtils;
public class JTisch extends JComponent {
private static final long serialVersionUID = 1L;
JFrame parent;
public int posX;
public int posY;
public int rotation;
public Person personlinks;
public Person personrechts;
public int width = 40;
public int height = 30;
public JTisch(int posX, int posY, int rotation, Person personlinks, Person personrechts, JFrame parent) {
super();
this.posX = posX;
this.posY = posY;
this.setLocation(this.posX, this.posY);
this.setSize(width, height);
this.rotation = rotation;
this.personlinks = personlinks;
this.personrechts = personrechts;
this.parent = parent;
}
public int getWidth() {
return width;
}
public int getHeight() {
return height;
}
@Override
public void paintComponent(Graphics g) {
try {
DrawUtils.drawPosLineWithStroke(g, this.posX , this.posY , this.posX + this.width, this.posY );
DrawUtils.drawPosLineWithStroke(g, this.posX , this.posY , this.posX , this.posY + this.height);
DrawUtils.drawPosLineWithStroke(g, this.posX + this.width, this.posY , this.posX + this.width, this.posY + this.height);
DrawUtils.drawPosLineWithStroke(g, this.posX , this.posY + this.height, this.posX + this.width, this.posY + this.height);
} catch (Exception e) {
}
}
}
这是我的DrawUtils课程：
package de.jakob.java.sitzplan.utils;
import java.awt.Graphics;
public class DrawUtils {
public static void drawRelativeLineWithStroke(Graphics g, int x, int y, int width, int height) throws Exception{
g.drawLine(x, y, x + width, y + height);
}
public static void drawPosLineWithStroke(Graphics g, int x, int y, int xend, int yend) throws Exception {
g.drawLine(x, y, xend, yend);
}
}
这里是漫长而复杂的框架......（不要介意已知的对象，只关注使用onUpdate（每50毫米调用一次）鼠标和JTisch的鼠标更新。
package de.jakob.java.sitzplan.frames;
import java.awt.Color;
import java.awt.Component;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.ArrayList;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import de.jakob.java.sitzplan.core.Core;
import de.jakob.java.sitzplan.elements.JDoppeltisch;
import de.jakob.java.sitzplan.elements.JTisch;
import de.jakob.java.sitzplan.tickthread.FrameUpdate;
import de.jakob.java.sitzplan.tickthread.TickHandler;
import java.awt.event.MouseMotionAdapter;
@SuppressWarnings("serial")
public class SitzplanErstellen extends JFrame implements FrameUpdate {
public JFrame frame;
public JFrame parent;
public boolean mousePressed = false;
public int mouseX = 0;
public int mouseY = 0;
public boolean hovered;
ArrayList<JTisch> tische = new ArrayList<JTisch>();
ArrayList<JDoppeltisch> doppeltische = new ArrayList<JDoppeltisch>();
// ArrayList<Tafel> tafeln = new ArrayList<Tafel>();
@Override
public void onUpdate() {
for (JTisch t : tische) {
if (mouseX >= t.posX && mouseX <= (t.posX + t.width)) {
System.out.println("hi");
if (mouseY >= t.posY + t.height && mouseY <= (t.posY + t.height * 2)) {
if (mousePressed) {
t.posX = mouseX;
t.posY = mouseY;
}
}
}
t.paintComponent(frame.getContentPane().getGraphics());
}
for (JDoppeltisch dt : doppeltische) {
dt.paintComponent(frame.getContentPane().getGraphics());
}
}
/**
* Create the application.
*/
public SitzplanErstellen(boolean b, JFrame parent) {
this.parent = parent;
TickHandler.registerClass(this);
initialize();
frame.setVisible(b);
frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
}
/**
* Initialize the contents of the frame.
*/
private void initialize() {
frame = new JFrame();
frame.getContentPane().setBackground(Color.GRAY);
frame.setBounds(Core.rect);
frame.getContentPane().setLayout(null);
frame.setIconImage(
new ImageIcon(SitzplanErstellen.class.getResource("/de/jakob/java/sitzplan/core/icon.png")).getImage());
JLabel lblKomponenten = new JLabel("Komponenten");
lblKomponenten.setFont(new Font("SansSerif", Font.BOLD, 11));
lblKomponenten.setBounds(13, 61, 78, 15);
frame.getContentPane().add(lblKomponenten);
JPanel panel = new JPanel();
panel.addMouseListener(new MouseAdapter() {
@Override
public void mouseEntered(MouseEvent e) {
hovered = true;
}
});
panel.setBackground(Color.WHITE);
panel.setBounds(136, 0, 1153, 635);
frame.getContentPane().add(panel);
JLabel lblSchler = new JLabel("Sch\u00FCler");
lblSchler.setFont(new Font("SansSerif", Font.BOLD, 11));
lblSchler.setBounds(13, 201, 78, 15);
frame.getContentPane().add(lblSchler);
JButton btnTafel = new JButton("Tafel");
btnTafel.setBounds(13, 121, 97, 23);
frame.getContentPane().add(btnTafel);
btnTafel.setBackground(Color.LIGHT_GRAY);
btnTafel.setToolTipText("Einen neue Tafel zum Klassenraum hinzuf\u00FCgen");
JButton btnDoppeltisch = new JButton("Doppeltisch");
btnDoppeltisch.setBounds(13, 87, 97, 23);
frame.getContentPane().add(btnDoppeltisch);
btnDoppeltisch.setBackground(Color.LIGHT_GRAY);
btnDoppeltisch.setToolTipText("Einen neuen Doppeltisch zum Klassenraum hinzuf\u00FCgen");
JButton btnEinzeltisch = new JButton("Einzeltisch");
btnEinzeltisch.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
JTisch jt = new JTisch(200, 100, 0, null, null, frame);
System.out.println("hi2");
tische.add(jt);
}
});
btnEinzeltisch.setBounds(13, 153, 97, 23);
frame.getContentPane().add(btnEinzeltisch);
btnEinzeltisch.setBackground(Color.LIGHT_GRAY);
btnEinzeltisch.setToolTipText("Einen neuen Einzeltisch zum Klassenraum hinzuf\u00FCgen");
JButton btnNewButton = new JButton("<html>Schüler<br>eintragen</html>");
btnNewButton.setBounds(13, 227, 97, 37);
frame.getContentPane().add(btnNewButton);
btnNewButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
frame.dispose();
Core.setSchuelerListeVisible(true, frame);
}
});
btnNewButton.setBackground(Color.LIGHT_GRAY);
JButton button = new JButton("<html>Sch\u00FCler<br>Wünsche<br>eintragen</html>");
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
}
});
button.setBackground(Color.LIGHT_GRAY);
button.setBounds(12, 275, 98, 51);
frame.getContentPane().add(button);
JButton button_1 = new JButton("Back");
button_1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
parent.setVisible(true);
frame.dispose();
}
});
button_1.setIcon(new ImageIcon(SitzplanErstellen.class.getResource("/de/jakob/java/sitzplan/core/pfeil.png")));
button_1.setFont(new Font("Dialog", Font.BOLD, 12));
button_1.setBackground(Color.LIGHT_GRAY);
button_1.setBounds(0, 0, 98, 26);
frame.getContentPane().add(button_1);
btnDoppeltisch.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
doppeltische.add(new JDoppeltisch(100, 50, 0, null, null, frame));
}
});
for (Component c : frame.getContentPane().getComponents()) {
c.addMouseListener(new MouseAdapter() {
@Override
public void mousePressed(MouseEvent e) {
mousePressed = true;
System.out.println("press");
}
@Override
public void mouseReleased(MouseEvent e) {
mousePressed = false;
System.out.println("not press");
}
});
c.addMouseMotionListener(new MouseMotionAdapter() {
@Override
public void mouseMoved(MouseEvent e) {
mouseX = e.getLocationOnScreen().x - frame.getLocationOnScreen().x;
System.out.println(mouseX);
mouseY = e.getLocationOnScreen().y - frame.getLocationOnScreen().y;
System.out.println(mouseY);
}
@Override
public void mouseDragged(MouseEvent e) {
mouseX = e.getLocationOnScreen().x - frame.getLocationOnScreen().x;
System.out.println(mouseX);
mouseY = e.getLocationOnScreen().y - frame.getLocationOnScreen().y;
System.out.println(mouseY);
}
});
}
frame.addMouseListener(new MouseAdapter() {
@Override
public void mousePressed(MouseEvent e) {
mousePressed = true;
System.out.println("press");
}
@Override
public void mouseReleased(MouseEvent e) {
mousePressed = false;
System.out.println("not press");
}
});
frame.addMouseMotionListener(new MouseMotionAdapter() {
@Override
public void mouseMoved(MouseEvent e) {
mouseX = e.getLocationOnScreen().x - frame.getLocationOnScreen().x;
System.out.println(mouseX);
mouseY = e.getLocationOnScreen().y - frame.getLocationOnScreen().y;
System.out.println(mouseY);
}
@Override
public void mouseDragged(MouseEvent e) {
mouseX = e.getLocationOnScreen().x - frame.getLocationOnScreen().x;
System.out.println(mouseX);
mouseY = e.getLocationOnScreen().y - frame.getLocationOnScreen().y;
System.out.println(mouseY);
}
});
}
}