[英]mouse listener does not listen
我有一個固定的學校作業。
我的目標是實現MVC,但現在我只是在視圖中進行所有操作(只是為了使事情變得簡單)。
所以-我有一個框架,它有一個面板。
面板上有一個形狀列表。 每當用戶按下addLine / addRect按鈕時,就會引發一個事件並將行/矩形添加到此列表中。
paintComponent函數繪制列表中的所有形狀(所有形狀都知道如何繪制自己)。
到目前為止,一切都很好-它有效!
此分配的唯一其他要求是,只要用戶單擊繪圖區域中的一個點,就會刪除所有包含該點的形狀。 每個形狀都有其自己的Contains(p)函數。 因此,我決定在面板上添加一個MouseListener,該鼠標監聽器將獲取點擊的X,Y坐標,並將從形狀列表中刪除相關的形狀。
我不知道這是否是個好主意,但目前這不是我的問題。
我的問題是MouseListener無法響應單擊-我知道這是因為在mouseClicked實現的內部有一個斷點,而調試器從未到達該斷點。
我的問題是為什么?
這是我的代碼:還有更多我需要解決的問題,但現在他們不關心我
//MyFrame.java
public class MyFrame extends JFrame {
private MyJPanel panel ;
public MyFrame() throws MyShape.IllegalArgumentException {
initUI();
}
private void initUI() throws IllegalArgumentException {
setLayout(new FlowLayout());
panel = new MyJPanel();
add(panel);
setTitle("Shapes Editor");
setSize(600, 600);
setLocationRelativeTo(null);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.pack();
setVisible(true);
}
}
//MyPanel.java
public class MyJPanel extends JPanel {
ArrayList<MyShapeAbstract> pic;
DrawingArea drawingArea;
ButtonsPanel buttonsPanel;
public ButtonsPanel getButtonsPanel() {
return buttonsPanel;
}
public void setButtonsPanel(ButtonsPanel buttonsPanel) {
this.buttonsPanel = buttonsPanel;
}
public ArrayList<MyShapeAbstract> getPic() {
return pic;
}
public void setPic(ArrayList<MyShapeAbstract> pic) {
this.pic = pic;
}
public MyJPanel() throws MyShape.IllegalArgumentException {
initUI();
}
private void initUI() throws MyShape.IllegalArgumentException {
setLayout(new FlowLayout());
pic = new ArrayList<MyShapeAbstract>();
add(buttonsPanel = new ButtonsPanel(this));
add(drawingArea = new DrawingArea(this));
drawingArea.addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent e) {
super.mouseClicked(e);
Point p = null;
try {
p = new Point(e.getX(), e.getY());
} catch (IllegalArgumentException e1) {
e1.printStackTrace();
}
Iterator<MyShapeAbstract> iter = pic.iterator();
while (iter.hasNext()){
MyShapeAbstract shape = iter.next();
if(shape.contains(p))
{
iter.remove();
}
}
drawingArea.repaint();
pic.clear();
repaint();
}
});
JButton addLineButton = buttonsPanel.getAddLineButton();
addLineButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
try {
addLine();
drawingArea.repaint();
repaint();
} catch (IllegalArgumentException e1) {
e1.printStackTrace();
}
}
});
add(addLineButton);
JButton addRectButton = buttonsPanel.getAddRectButton();
addRectButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
try {
addRect();
} catch (IllegalArgumentException e1) {
e1.printStackTrace();
}
drawingArea.repaint();
repaint();
}
});
add(addRectButton);
}
@Override
public void repaint() {
Graphics g = getGraphics();
if(g!=null && pic != null)
for(MyShapeAbstract shape : pic){
shape.draw(g);
}
}
private void addRect() throws IllegalArgumentException {
Random r = new Random();
pic.add(new MyRectangle(new Point(r.nextInt(200), r.nextInt(200)), new Point(r.nextInt(200),r.nextInt(200))));
}
private void addLine() throws IllegalArgumentException {
Random r = new Random();
pic.add(new MyLine(new Point(r.nextInt(200), r.nextInt(200)), new Point(r.nextInt(200),r.nextInt(200))));
}
}
class DrawingArea extends JPanel{
public DrawingArea(MyJPanel parent) {
this.parent = parent;
setLayout(new FlowLayout());
}
@Override
public void repaint() {
Graphics g = getGraphics();
if(g!=null && parent.getPic() != null)
for(MyShapeAbstract shape : parent.getPic()){
shape.draw(g);
}
}
MyJPanel parent;
}
class ButtonsPanel extends JPanel{
//ArrayList<JButton> buttons = new ArrayList<JButton>();
MyJPanel parent;
private JButton addLineButton = new JButton("addLineButton");
private JButton addRectButton = new JButton("addRectButton");
ButtonsPanel(final MyJPanel parent){
this.parent = parent;
setLayout(new FlowLayout());
add(addLineButton);
add(addRectButton);
addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent e) {
super.mouseClicked(e);
Point p = null;
try {
p = new Point(e.getX(), e.getY());
} catch (IllegalArgumentException e1) {
e1.printStackTrace();
}
Iterator<MyShapeAbstract> iter = parent.getPic().iterator();
while (iter.hasNext()){
MyShapeAbstract shape = iter.next();
if(shape.contains(p))
{
iter.remove();
}
}
repaint();
}
});
}
@Override
public void repaint() {
Graphics g = getGraphics();
if(g!=null && parent.getPic() != null)
for(MyShapeAbstract shape : parent.getPic()){
shape.draw(g);
}
}
public JButton getAddLineButton() {
return addLineButton;
}
public void setAddLineButton(JButton addLineButton) {
this.addLineButton = addLineButton;
}
public JButton getAddRectButton() {
return addRectButton;
}
public void setAddRectButton(JButton addRectButton) {
this.addRectButton = addRectButton;
}
}
我在您的“按鈕面板”中添加了以下內容:
ButtonsPanel(final MyJPanel parent){
this.parent = parent;
setLayout(new FlowLayout());
add(addLineButton);
add(addRectButton);
//show me the Panel size :)
this.setBackground(Color.RED);
紅色小矩形是鼠標偵聽器工作的區域。 因此,也許您的意思是parent.addMouseListener
或drawingArea..addMouseListener
(但是您的drawingArea也有點小)? 只需將技巧與背景一起使用,然后檢查您的區域並調整大小或您真正想擁有監聽器的面板即可。 也許還添加MyShapeAbstract,MyLine,MyRectangle,以便可以測試完整的代碼。
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