如何在Java中向JFrame添加多个可拖动图像?
我对我的java代码有疑问。我的目标是制作一个JFrame,其中我可以有多个可拖动的图像,这些图像可以捕捉到一个网格 问题: 我只能添加一个可拖动的图像。拖动并捕捉到栅格效果良好。只要我尝试向JFrame添加更多可拖动的图像(我尝试在MainScreen.java文件底部附近添加),它就会只显示我添加的最后一个图像 代码: MainScreen.java如何在Java中向JFrame添加多个可拖动图像?,java,image,swing,draggable,Java,Image,Swing,Draggable,我对我的java代码有疑问。我的目标是制作一个JFrame,其中我可以有多个可拖动的图像,这些图像可以捕捉到一个网格 问题: 我只能添加一个可拖动的图像。拖动并捕捉到栅格效果良好。只要我尝试向JFrame添加更多可拖动的图像(我尝试在MainScreen.java文件底部附近添加),它就会只显示我添加的最后一个图像 代码: MainScreen.java package systematics; import java.awt.Color; import java.awt.Dimension;
package systematics;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Image;
import java.awt.Toolkit;
import java.util.ArrayList;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
public class MainScreen extends JFrame {
private static Image img = Toolkit.getDefaultToolkit().getImage("C:/Users/lenar_000/Pictures/splitter skin.png");
public static JFrame main = new JFrame();
public static Dimension screensize = Toolkit.getDefaultToolkit().getScreenSize();
public static JPanel content = new JPanel();
public static JMenuBar menubar = new JMenuBar();
public static ArrayList<JMenuItem> menuitem = new ArrayList<JMenuItem>();
public static ArrayList<JMenu> menu = new ArrayList<JMenu>(20);
public static ArrayList<JComponent> gates = new ArrayList<JComponent>();
public static componentGate gate = new componentGate(0, 1, 1, null);
public static int imageWidth = 60, imageHeight = 60, imageX, imageY, gridw = 10, gridh = 10;
public static DragImage componentimage = new DragImage(img, 300, 300, 200, 200);
public static DragImage componentimage1 = new DragImage(img, 50, 50, 50, 50);
public static JFrame createmain() {
//location and size of the window
main.setJMenuBar(createmenu());
main.setExtendedState(JFrame.MAXIMIZED_BOTH);
int w = (int) screensize.getWidth();
int h = (int) screensize.getHeight();
main.setSize((int) (w / 2), (int) (h / 2));
int w1 = (int) main.getSize().getWidth();
int h1 = (int) main.getSize().getHeight();
int x = (screensize.width-w1)/2;
int y = (screensize.height-h1)/2;
main.setLocation(x, y);
//other stuff
main.setVisible(true);
main.setTitle("systematic");
main.setDefaultCloseOperation(EXIT_ON_CLOSE);
return main;
}
//unused
public static JPanel createcontent() {
content.setBackground(Color.DARK_GRAY);
content.setVisible(true);
content.setOpaque(true);
return content ;
}
//to make the menubar
public static JMenuBar createmenu() {
//add the items to the arrays which hold the menu's and the menuitems
menu.add(0, new JMenu());
menu.add(1, new JMenu());
menu.add(2, new JMenu());
menuitem.add(0, new JMenuItem());
menuitem.add(1, new JMenuItem());
menuitem.add(2, new JMenuItem());
//some settings for the menubar
menubar.setOpaque(true);
menubar.setVisible(true);
menubar.setBackground(new Color(255, 255, 255));
//adding the first menu which contains a submenu
menu.get(0).setText("File");
menu.get(0).setOpaque(true);
menu.get(0).setBackground(new Color(255, 255, 255));
menubar.add(menu.get(0), 0);
menuitem.get(0).setText("new file");
menuitem.get(0).setToolTipText("creates and opens a new file");
menuitem.get(0).setOpaque(true);
menuitem.get(0).setBackground(new Color(255, 255, 255));
menu.get(0).add(menuitem.get(0), 0);
//adding the second menu which contains a submenu
menu.get(1).setText("Toolbars");
menu.get(1).setOpaque(true);
menu.get(1).setBackground(new Color(255, 255, 255));
menubar.add(menu.get(1), 1);
menuitem.get(1).setText("components");
menuitem.get(1).setToolTipText("toggle for the components toolbar");
menuitem.get(1).setOpaque(true);
menuitem.get(1).setBackground(new Color(255, 255, 255));
menu.get(1).add(menuitem.get(1), 0);
//adding the third menu which contains a submenu
menu.get(2).setText("Toolbars");
menu.get(2).setOpaque(true);
menu.get(2).setBackground(new Color(255, 255, 255));
menubar.add(menu.get(2), 2);
menuitem.get(2).setText("components");
menuitem.get(2).setToolTipText("toggle for the components toolbar");
menuitem.get(2).setOpaque(true);
menuitem.get(2).setBackground(new Color(255, 255, 255));
menu.get(2).add(menuitem.get(2), 0);
return menubar;
}
public static void main(String[] args) {
createmain();
//creategrid();
main.getContentPane().add(componentimage, 0);
main.getContentPane().add(componentimage1, 1);
}
//unused
private static void creategrid() {
DrawingLine line1 = new DrawingLine();
main.getContentPane().add(line1,-1);
}
private static final long serialVersionUID = 1L;
}
包装系统学;
导入java.awt.Color;
导入java.awt.Dimension;
导入java.awt.Image;
导入java.awt.Toolkit;
导入java.util.ArrayList;
导入javax.swing.JComponent;
导入javax.swing.JFrame;
导入javax.swing.JMenu;
导入javax.swing.JMenuBar;
导入javax.swing.JMenuItem;
导入javax.swing.JPanel;
公共类主屏幕扩展JFrame{
私有静态图像img=Toolkit.getDefaultToolkit().getImage(“C:/Users/lenar_000/Pictures/splitter skin.png”);
public static JFrame main=new JFrame();
公共静态维度screensize=Toolkit.getDefaultToolkit().getScreenSize();
public static JPanel content=new JPanel();
public static JMenuBar menubar=new JMenuBar();
public static ArrayList menuitem=new ArrayList();
公共静态ArrayList菜单=新建ArrayList(20);
公共静态ArrayList门=新ArrayList();
公共静态componentGate=新componentGate(0,1,1,null);
公共静态int-imageWidth=60,imageHeight=60,imageX,imageY,gridw=10,gridh=10;
公共静态绘图组件图像=新绘图(img,300300200200);
公共静态绘图组件1=新绘图(img,50,50,50,50);
公共静态JFrame createmain(){
//窗口的位置和大小
setJMenuBar(createmenu());
setExtendedState(JFrame.MAXIMIZED_两者);
int w=(int)screensize.getWidth();
inth=(int)screensize.getHeight();
主要设置尺寸((内部)(w/2),(内部)(h/2));
int w1=(int)main.getSize().getWidth();
inth1=(int)main.getSize().getHeight();
INTX=(屏幕大小.宽度-w1)/2;
int y=(屏幕大小.高度-h1)/2;
主设置位置(x,y);
//其他东西
main.setVisible(true);
主要。设置标题(“系统”);
main.setDefaultCloseOperation(关闭时退出);
回水总管;
}
//未使用
公共静态JPanel createcontent(){
内容:挫折背景(颜色:深灰色);
content.setVisible(true);
content.set不透明(true);
返回内容;
}
//制作菜单栏
公共静态jmenubarcreatemenu(){
//将项目添加到包含菜单和菜单项的数组中
添加(0,新JMenu());
添加(1,新JMenu());
添加(2,新JMenu());
添加(0,新JMenuItem());
添加(1,新JMenuItem());
添加(2,新JMenuItem());
//菜单栏的一些设置
menubar.set不透明(true);
menubar.setVisible(true);
menubar.setBackground(新颜色(255、255、255));
//添加包含子菜单的第一个菜单
menu.get(0.setText(“文件”);
menu.get(0).setOpaque(true);
menu.get(0.setBackground)(新颜色(255、255、255));
menubar.add(menu.get(0),0);
menuitem.get(0.setText(“新文件”);
menuitem.get(0).setToolTipText(“创建并打开新文件”);
menuitem.get(0).setOpaque(true);
menuitem.get(0.setBackground)(新颜色(255、255、255));
menu.get(0)、add(menuitem.get(0)、0);
//添加包含子菜单的第二个菜单
menu.get(1.setText(“工具栏”);
menu.get(1).setOpaque(true);
menu.get(1.setBackground)(新颜色(255、255、255));
menubar.add(menu.get(1),1);
menuitem.get(1.setText)(“组件”);
menuitem.get(1.setToolTipText(“组件工具栏切换”);
menuitem.get(1).set不透明(true);
menuitem.get(1.setBackground)(新颜色(255、255、255));
menu.get(1)、add(menuitem.get(1)、0);
//添加包含子菜单的第三个菜单
menu.get(2.setText)(“工具栏”);
menu.get(2).setOpaque(true);
menu.get(2.setBackground)(新颜色(255、255、255));
menubar.add(menu.get(2),2);
menuitem.get(2.setText)(“组件”);
menuitem.get(2.setToolTipText(“组件工具栏切换”);
menuitem.get(2).set不透明(true);
menuitem.get(2.setBackground)(新颜色(255、255、255));
menuitem.get(2)、add(menuitem.get(2)、0);
返回菜单栏;
}
公共静态void main(字符串[]args){
createmain();
//creategrid();
main.getContentPane().add(componentimage,0);
getContentPane().add(componentimage1,1);
}
//未使用
私有静态void creategrid(){
DrawingLine1=新的DrawingLine();
main.getContentPane().add(第1行,-1);
}
私有静态最终长serialVersionUID=1L;
}
德拉吉
package systematics;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import javax.swing.JComponent;
public class DragImage extends JComponent implements MouseMotionListener, MouseListener {
private static final long serialVersionUID = 1L;
private int imageWidth, imageHeight, gridw = 50, gridh = 50, imageX/* = gridw / 2 - imageWidth / 2*/, imageY/* = gridh / 2 - imageHeight / 2*/, onObject, checked;
private Image image;
DragImage(Image i, int imgX, int imgY, int imagewidth, int imageheight) {
this.imageWidth = imagewidth;
this.imageHeight = imageheight;
this.imageX = imgX;
this.imageY = imgY;
this.image = i.getScaledInstance(imageWidth, imageHeight, 0);
addMouseMotionListener(this);
addMouseListener(this);
}
public void mouseDragged(MouseEvent e) {
//first checking if "onObject" is 1 to make sure that the mouse is on the image when it started dragging
if(this.onObject == 1) {
if((int) (Math.floor(e.getX() / this.gridw) * this.gridw + (this.gridw / 2) - (this.imageWidth / 2)) != this.imageX || (int) (Math.floor(e.getY() / this.gridh) * this.gridh + (this.gridh / 2) - (this.imageHeight / 2)) != this.imageY) {
this.imageX = (int) (Math.floor(e.getX() / this.gridw) * this.gridw + (this.gridw / 2) - (this.imageWidth / 2));
this.imageY = (int) (Math.floor(e.getY() / this.gridh) * this.gridh + (this.gridh / 2) - (this.imageHeight / 2));
this.repaint();
}
}
}
public void paint(Graphics g) {
Graphics2D g2 = (Graphics2D) g;
//repainting the object that you are dragging at the new location, which is determined by the math in "mouseDragged"
g2.drawImage(this.image, this.imageX, this.imageY, this);
}
@Override
public void mousePressed(MouseEvent e) {
// TODO Auto-generated method stub
//this checks if the mouse is on the object when you start dragging, for the method mouseDragged runs when you drag, regardless of the mouse position
System.out.println("");
System.out.println("pressed, checked is now: " + this.checked);
if(this.checked == 0 && (e.getX() >= this.imageX) && (e.getY() >= this.imageY) && (e.getX() <= this.imageX + (this.imageWidth)) && (e.getY() <= this.imageY + (this.imageHeight))) {
this.onObject = 1;
System.out.println("onObject: " + this.onObject);
}
//checked is a parameter, which is used to make sure that this method doesn't run all the time, but only when the mouse started dragging
this.checked = 1;
System.out.println("checked: " + this.checked);
}
@Override
public void mouseReleased(MouseEvent e) {
// TODO Auto-generated method stub
System.out.println("");
System.out.println("released, checked is now: " + this.checked);
this.onObject = 0;
System.out.println("onObject: " + this.onObject);
//setting checked to 0 when the mouse stops dragging, so when it starts dragging, it can check wether the mouse is on the image yes or no
checked = 0;
System.out.println("checked: " + this.checked);
}
//some unused implemented methods
@Override
public void mouseMoved(MouseEvent e) {
// TODO Auto-generated method stub
}
@Override
public void mouseClicked(MouseEvent e) {
// TODO Auto-generated method stub
}
@Override
public void mouseEntered(MouseEvent e) {
// TODO Auto-generated method stub
}
@Override
public void mouseExited(MouseEvent e) {
// TODO Auto-generated method stub
}
}
包装系统学;
导入java.awt.Graphics;
导入java.awt.Graphics2D;
导入java.awt.Image;
导入java.awt.event.MouseEvent;
导入java.awt.event.MouseListener;
导入java.awt.event.MouseMotionListener;
导入javax.swing.JComponent;
公共类DragImage扩展JComponent实现MouseMotionListener、MouseListener{
私有静态最终长serialVersionUID=1L;
private int imageWidth,imageHeight,gridw=50,gridh=50,imageX/*=gridw/2-imageWidth/2*/,imageY/*=gridh/2-imageHeight/2*/,onObject,选中;
私有图像;
绘图(图像i、int imgX、int imgY、int IMAGEWITH、int IMAGEHEIGH){
this.imageWidth=imageWidth;
this.imageHeight=imageHeight;
this.imageX=imgX;
这
main.getContentPane().add(componentimage, 0);
main.getContentPane().add(componentimage1, 1);