上記のコードには多くのエラーがあります...
null/を使用しないでAbsolute LayoutManagerください。コンテナ内のコンポーネントのレイアウト をご覧ください。setSizeコンポーネントを呼び出さないでJFrameください (正しいレイアウト マネージャーが実装されている場合は、コンポーネントを追加して を呼び出すだけpack()ですJFrame。- EDT で Swing コンポーネントを作成および操作します。Swing での同時実行の詳細を参照してください。
- 可視コンテナからコンポーネントを追加/削除した後、コンテナで
revalidate()andを呼び出す必要があります。repaint()
私は、Swing コンポーネントを 1つまたは複数のComponentDragにドラッグできるようにする独自の小さな API に取り組んでいます。ただし、決してエラーがないわけではありません（特に、複数のコンポーネントの部分は今日完成したばかりなので、わかりません）JComponentJComponent
以下を作成JButtonして追加しJPanelます。
JButton button = new JButton("Text");
JPanel panel1 = new JPanel() {
@Override
public Dimension getPreferredSize() {
return new Dimension(300, 300);
}
};
panel1.add(button);
ComponentDragコンテナの引数を渡すことでクラスのインスタンスを作成するよりも、つまりJFrame/JDialogまたはドラッグ可能なコンポーネントを登録し、特に複数のJComponentsなどでドラッグアンドドロップを正しく実行できるようにJWindow呼び出すsetName("Droppable")よりも、 sなどに対してのみこれを行います。スイングコンポーネントもドロップする機能が必要です。JPanelJPanel
JFrame frame=..;//has access to setGlassPane same applies for JDialog and JWindow
frame.add(panel1);
ComponentDrag cd=new ComponentDrag(frame);
cd.registerComponent(button);
panel1.setName("Droppable");//needed for the dragging and dropping to work correctly especailly over multiple components
そして、あなたの良い行くことができます:)。
分析目的で 2 つの完全な例を次に示します。
1) s を移動し、それに応じてそのメソッドを使用およびオーバーライドしJButtonて再配置するロジックを示します。ComponentDragcomponentDropped
ドラッグ前:
4 を 1 の位置にドラッグした後:
import java.awt.Component;
import java.awt.Container;
import java.awt.Cursor;
import java.awt.Graphics;
import java.awt.GridLayout;
import java.awt.Point;
import java.awt.event.ActionEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.image.BufferedImage;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import javax.swing.AbstractAction;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.Timer;
public class DragButtonsTest {
ArrayList<JButton> buttons = new ArrayList<>();
public DragButtonsTest() {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
final JPanel panel = new JPanel(new GridLayout(2, 2));
ComponentDrag cd = new ComponentDrag(frame) {
@Override
protected void componentDropped(MouseEvent me) {
HashMap<Integer, JButton> collisions = new HashMap<>();
JButton draggedButton = (JButton) me.getSource();
for (JButton btn : buttons) {//iterate through all buttons and get the number of collsions of each
if (btn != draggedButton) {//dont chck button we were dragging
int col = checkPerPixelCollision(draggedButton, btn);
System.out.println("Button " + btn.getText());
System.out.println(col);
collisions.put(col, btn);
}
}
//lets get the button which had most collisions
int maxCollisions = 0;
JButton intersectingButton = null;
for (Map.Entry<Integer, JButton> entry : collisions.entrySet()) {
Integer collisionCount = entry.getKey();
JButton button = entry.getValue();
if (collisionCount > maxCollisions) {
maxCollisions = collisionCount;
intersectingButton = button;
}
}
boolean reLayout = false;
if (maxCollisions > 0) {//check if there was any
System.out.println("Button " + draggedButton.getText() + " is intersecting more of Button " + intersectingButton.getText());
System.out.println("Collisions: " + maxCollisions);
reLayout = true;
} else {
System.out.println("No change made");
reLayout = false;
}
ArrayList<JButton> tmpButtons = (ArrayList<JButton>) buttons.clone();//create clone of buttons
if (reLayout) {//a button as moved and panel needs to be layed out
buttons.clear();//clear old buttons
for (JButton b : tmpButtons) {//re-order jbuttons
if (b == intersectingButton) {
buttons.add(draggedButton);
} else if (b == draggedButton) {
buttons.add(intersectingButton);
} else {
buttons.add(b);
}
}
panel.removeAll();//remove all buttons
for (JButton btn : buttons) {//iterate through all buttons and get the number of collsions of each
panel.add(btn);//re-add buttons according to arraylist
}
panel.revalidate();
panel.repaint();
}
super.componentDropped(me);
}
};
for (int i = 0; i < 4; i++) {
JButton b = new JButton(String.valueOf(i + 1));
panel.add(b);
buttons.add(b);
cd.registerComponent(b);
}
frame.add(panel);
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new DragButtonsTest();
}
});
}
public HashSet<String> getMask(JButton e) {
HashSet<String> mask = new HashSet<>();
int pixel, a;
BufferedImage bi = componentToImage(e); //gets the current image being shown
for (int i = 0; i < bi.getWidth(); i++) { // for every (x,y) component in the given box,
for (int j = 0; j < bi.getHeight(); j++) {
pixel = bi.getRGB(i, j); // get the RGB value of the pixel
a = (pixel >> 24) & 0xff;
if (a != 0) { // if the alpha is not 0, it must be something other than transparent
mask.add((e.getX() + i) + "," + (e.getY() - j)); // add the absolute x and absolute y coordinates to our set
}
}
}
return mask; //return our set
}
public static BufferedImage componentToImage(Component component) {
BufferedImage img = new BufferedImage(component.getWidth(), component.getHeight(), BufferedImage.TRANSLUCENT);
Graphics g = img.getGraphics();
component.paintAll(g);
return img;
}
// Returns true if there is a collision between object a and object b
public int checkPerPixelCollision(JButton b, JButton b2) {
// This method detects to see if the images overlap at all. If they do, collision is possible
int ax1 = (int) b2.getX();
int ay1 = (int) b2.getY();
int ax2 = ax1 + (int) b2.getWidth();
int ay2 = ay1 + (int) b2.getHeight();
int bx1 = (int) b.getX();
int by1 = (int) b.getY();
int bx2 = bx1 + (int) b.getWidth();
int by2 = by1 + (int) b.getHeight();
if (by2 < ay1 || ay2 < by1 || bx2 < ax1 || ax2 < bx1) {
return 0; // Collision is impossible.
} else { // Collision is possible.
// get the masks for both images
HashSet<String> maskPlayer1 = getMask(b2);
HashSet<String> maskPlayer2 = getMask(b);
maskPlayer1.retainAll(maskPlayer2); // Check to see if any pixels in maskPlayer2 are the same as those in maskPlayer1
if (maskPlayer1.size() > 0) { // if so, than there exists at least one pixel that is the same in both images, thus
return maskPlayer1.size();
}
}
return 0;
}
}
class ComponentDrag {
private MouseAdapter ma;
private ArrayList<JComponent> components = new ArrayList<>();
private int startingX, startingY;
private boolean autoLayout = true;
private final JFrame container;
private JPanel glassPane;
boolean firstTime = true;
private JComponent lastClickedContainer;
public ComponentDrag(final JFrame container) {
this.container = container;
glassPane = new JPanel();
glassPane.setOpaque(false);
glassPane.setLayout(null);
this.container.setGlassPane(glassPane);
new Timer(10, new AbstractAction() {
@Override
public void actionPerformed(ActionEvent ae) {
if (container.isVisible()) {
glassPane.setVisible(true);
((Timer) ae.getSource()).stop();
}
}
}).start();
ma = new MouseAdapter() {
@Override
public void mousePressed(MouseEvent me) {
super.mousePressed(me);
componentPressed(me);
}
@Override
public void mouseReleased(MouseEvent me) {
super.mouseReleased(me);
componentDropped(me);
}
@Override
public void mouseDragged(MouseEvent me) {
super.mouseDragged(me);
componentDragged(me);
}
};
}
public JComponent findDroppableUnderGlassPane(Point p, Container container, Component source) {
JComponent c = null;
Component[] comps = container.getComponents();
for (Component com : comps) {
if (com.getName() != null) {
if (com.getName().equals("Droppable") && com instanceof JComponent) {
if (com.contains(SwingUtilities.convertPoint(source, p, com))) {
return (JComponent) com;
}
} else if (com instanceof Container) {
findDroppableUnderGlassPane(p, (Container) com, source);
}
}
}
return c;
}
public boolean isAutoLayout() {
return autoLayout;
}
public void setAutoLayout(boolean autoLayout) {
this.autoLayout = autoLayout;
}
protected void componentDropped(MouseEvent me) {
firstTime = true;
Component droppedComponent = (Component) me.getSource();
droppedComponent.setCursor(null);
JComponent jc = findDroppableUnderGlassPane(me.getPoint(), container.getContentPane(), (Component) me.getSource());
if (jc != null) {
glassPane.removeAll();
glassPane.revalidate();
glassPane.repaint();
jc.add(droppedComponent);
System.out.println("Removed from glasspane and added to: " + jc);
if (autoLayout) {
if (lastClickedContainer != null) {
lastClickedContainer.revalidate();
lastClickedContainer.repaint();
}
droppedComponent.revalidate();
droppedComponent.repaint();
jc.revalidate();
jc.repaint();
}
} else {
glassPane.removeAll();
glassPane.revalidate();
glassPane.repaint();
if (lastClickedContainer != null) {
lastClickedContainer.add(droppedComponent);
lastClickedContainer.revalidate();
lastClickedContainer.repaint();
}
}
}
protected void componentPressed(MouseEvent me) {
JComponent jc = findDroppableUnderGlassPane(me.getPoint(), container.getContentPane(), (Component) me.getSource());
if (jc != null && jc.getName().equals("Droppable")) {
lastClickedContainer = jc;
System.out.println("Pressed: " + lastClickedContainer);
}
boolean clickedRegisteredComponent = false;
Component clickedComponent = (Component) me.getSource();
for (Component component : ComponentDrag.this.components) {
if (component.equals(clickedComponent)) {
clickedRegisteredComponent = true;
break;
}
}
if (clickedRegisteredComponent) {
startingX = me.getX();
startingY = me.getY();
clickedComponent.setCursor(new Cursor(Cursor.MOVE_CURSOR));
}
}
protected void componentDragged(MouseEvent me) {
Component draggedComponent = (Component) me.getSource();
if (firstTime && lastClickedContainer != null) {
firstTime = false;
lastClickedContainer.remove(draggedComponent);
lastClickedContainer.revalidate();
lastClickedContainer.repaint();
glassPane.add(draggedComponent);
glassPane.revalidate();
glassPane.repaint();
System.out.println("Removed from: " + lastClickedContainer + " \nAnd added to glasspane for dragging");
}
//MouseEvent will refire on each drag with the position being relative to the firing Component
draggedComponent.setLocation((me.getX() - startingX) + draggedComponent.getLocation().x, (me.getY() - startingY) + draggedComponent.getLocation().y);
}
void registerComponent(JComponent draggableComp) {
draggableComp.addMouseListener(ma);
draggableComp.addMouseMotionListener(ma);
components.add(draggableComp);
}
void deregisterComponent(JComponent draggableComp) {
draggableComp.removeMouseListener(ma);
draggableComp.removeMouseMotionListener(ma);
components.remove(draggableComp);
}
}
2) JLabels を横切って 2 s をJPanelドラッグする方法を簡単に示します。
Drag meラベルをドラッグする前:
ラベルをドラッグした後:
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Container;
import java.awt.Cursor;
import java.awt.Dimension;
import java.awt.Point;
import java.awt.event.ActionEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.ArrayList;
import javax.swing.AbstractAction;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JSeparator;
import javax.swing.SwingUtilities;
import javax.swing.Timer;
/**
*
* @author David
*/
public class DragOverMultipleComponentsTest {
public DragOverMultipleComponentsTest() {
createAndShowUI();
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new DragOverMultipleComponentsTest();
}
});
}
private void createAndShowUI() {
final JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JLabel draggableLabel = new JLabel("<- Drag me");
JLabel draggableLabel2 = new JLabel("<- Drag me too");
JLabel labelPanel1 = new JLabel("Drag 'em here");
JPanel panel1 = new JPanel() {
@Override
public Dimension getPreferredSize() {
return new Dimension(300, 300);
}
};
panel1.add(labelPanel1);
panel1.setName("Droppable");
JLabel labelPanel2 = new JLabel("Drag 'em here");
JPanel panel2 = new JPanel();
panel2.add(labelPanel2);
panel2.add(draggableLabel);
panel2.add(draggableLabel2);
panel2.setName("Droppable");
JSeparator js = new JSeparator(JSeparator.VERTICAL);
ComponentDrag cd = new ComponentDrag(frame);
cd.registerComponent(draggableLabel);
cd.registerComponent(draggableLabel2);
frame.add(panel1, BorderLayout.WEST);
frame.add(js);
frame.add(panel2, BorderLayout.EAST);
frame.pack();
frame.setVisible(true);
}
}
class ComponentDrag {
private MouseAdapter ma;
private ArrayList<JComponent> components = new ArrayList<>();
private int startingX, startingY;
private boolean autoLayout = true;
private final JFrame container;
private JPanel glassPane;
boolean firstTime = true;
private JComponent lastClickedContainer;
public ComponentDrag(final JFrame container) {
this.container = container;
glassPane = new JPanel();
glassPane.setOpaque(false);
glassPane.setLayout(null);
this.container.setGlassPane(glassPane);
new Timer(10, new AbstractAction() {
@Override
public void actionPerformed(ActionEvent ae) {
if (container.isVisible()) {
glassPane.setVisible(true);
((Timer) ae.getSource()).stop();
}
}
}).start();
ma = new MouseAdapter() {
@Override
public void mousePressed(MouseEvent me) {
super.mousePressed(me);
componentPressed(me);
}
@Override
public void mouseReleased(MouseEvent me) {
super.mouseReleased(me);
componentDropped(me);
}
@Override
public void mouseDragged(MouseEvent me) {
super.mouseDragged(me);
componentDragged(me);
}
};
}
public JComponent findDroppableUnderGlassPane(Point p, Container container, Component source) {
JComponent c = null;
Component[] comps = container.getComponents();
for (Component com : comps) {
if (com.getName() != null) {
if (com.getName().equals("Droppable") && com instanceof JComponent) {
if (com.contains(SwingUtilities.convertPoint(source, p, com))) {
return (JComponent) com;
}
} else if (com instanceof Container) {
findDroppableUnderGlassPane(p, (Container) com, source);
}
}
}
return c;
}
public boolean isAutoLayout() {
return autoLayout;
}
public void setAutoLayout(boolean autoLayout) {
this.autoLayout = autoLayout;
}
protected void componentDropped(MouseEvent me) {
firstTime = true;
Component droppedComponent = (Component) me.getSource();
droppedComponent.setCursor(null);
JComponent jc = findDroppableUnderGlassPane(me.getPoint(), container.getContentPane(), (Component) me.getSource());
if (jc != null) {
glassPane.removeAll();
glassPane.revalidate();
glassPane.repaint();
jc.add(droppedComponent);
System.out.println("Removed from glasspane and added to: " + jc);
if (autoLayout) {
if (lastClickedContainer != null) {
lastClickedContainer.revalidate();
lastClickedContainer.repaint();
}
droppedComponent.revalidate();
droppedComponent.repaint();
jc.revalidate();
jc.repaint();
}
} else {
glassPane.removeAll();
glassPane.revalidate();
glassPane.repaint();
if (lastClickedContainer != null) {
lastClickedContainer.add(droppedComponent);
lastClickedContainer.revalidate();
lastClickedContainer.repaint();
}
}
}
protected void componentPressed(MouseEvent me) {
JComponent jc = findDroppableUnderGlassPane(me.getPoint(), container.getContentPane(), (Component) me.getSource());
if (jc != null && jc.getName().equals("Droppable")) {
lastClickedContainer = jc;
System.out.println("Pressed: " + lastClickedContainer);
}
boolean clickedRegisteredComponent = false;
Component clickedComponent = (Component) me.getSource();
for (Component component : ComponentDrag.this.components) {
if (component.equals(clickedComponent)) {
clickedRegisteredComponent = true;
break;
}
}
if (clickedRegisteredComponent) {
startingX = me.getX();
startingY = me.getY();
clickedComponent.setCursor(new Cursor(Cursor.MOVE_CURSOR));
}
}
protected void componentDragged(MouseEvent me) {
Component draggedComponent = (Component) me.getSource();
if (firstTime && lastClickedContainer != null) {
firstTime = false;
lastClickedContainer.remove(draggedComponent);
lastClickedContainer.revalidate();
lastClickedContainer.repaint();
glassPane.add(draggedComponent);
glassPane.revalidate();
glassPane.repaint();
System.out.println("Removed from: " + lastClickedContainer + " \nAnd added to glasspane for dragging");
}
//MouseEvent will refire on each drag with the position being relative to the firing Component
draggedComponent.setLocation((me.getX() - startingX) + draggedComponent.getLocation().x, (me.getY() - startingY) + draggedComponent.getLocation().y);
}
void registerComponent(JComponent draggableComp) {
draggableComp.addMouseListener(ma);
draggableComp.addMouseMotionListener(ma);
components.add(draggableComp);
}
void deregisterComponent(JComponent draggableComp) {
draggableComp.removeMouseListener(ma);
draggableComp.removeMouseMotionListener(ma);
components.remove(draggableComp);
}
}