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私は自分のJavaコードについて質問があります。私の目標は、グリッドにスナップする複数のドラッグ可能な画像を持つことができるJFrameを作成することです。JavaでJFrameに複数のドラッグ可能なイメージを追加するには？
問題：
私は一つだけドラッグ可能な画像を追加することができます。グリッドへのドラッグとスナップはうまく動作します。 JFrameにドラッグ可能なイメージを追加しようとすると（私はMainScreen.javaファイルの一番下にある）、最後にが追加されたが表示されます。
コード：
MainScreen.java
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;
}
dragImageのところで
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
}
}
、私はグリッドにスナップを行うために、その数学の非常に誇りに思っています： ）
任意の解決策は高く評価されています
ドラッグ可能（コンテナ内のコンポーネントをドラッグするため）をチェックアウトしたい場合があります：https://sourceforge.net/p/tus/code/HEAD/tree/tjacobs/ui/drag/ – ControlAltDel
固定されているようです問題は、私はかなり知りませんが、私はJPanelのレイアウトだったと思います。私はやった：main.getContentPane（）。setLayout（new BorderLayout（））;私はそれがそれを機能させたのかどうかはわかりませんが、それはもう少し前です。 –