我的代碼的想法是,當我的鼠標進入一個特定的jscrollpane時,它開始打印出它下面的rgb值。 我希望它在我的鼠標退出jscrollpane時停止打印出這些rgb值。如何使用MouseListener啓動後臺線程?
try{
String path = "C:\\Users\\Bernard\\Documents\\viking\\map\\provinces.bmp";
Image image = ImageIO.read(new File(path));
ImageIcon icon = new ImageIcon(image);
lblMap = new JLabel(icon);
JPanel jp = new JPanel();
jp.add(lblMap);
provincesPanel.add(jScrollPane1);
jScrollPane1.setViewportView(jp);
jScrollPane1.setAlignmentX(JFrame.RIGHT_ALIGNMENT);
jScrollPane1.addMouseListener(new MouseListener() {
@Override
public void mouseClicked(MouseEvent me) {
}
@Override
public void mousePressed(MouseEvent me) {
}
@Override
public void mouseReleased(MouseEvent me) {
}
@Override
public void mouseEntered(MouseEvent me) {
mapMuis =true;
SwingWorker sw = new SwingWorker<Color, Color>() {
@Override
protected Color doInBackground() {
while (mapMuis==true){
pointer = MouseInfo.getPointerInfo();
point = pointer.getLocation();
color = robot.getPixelColor((int) point.getX(), (int) point.getY());
System.out.println("Color at: " + point.getX() + "," + point.getY() + " is: " + color);
return color;
}
return color;
}
};
}
@Override
public void mouseExited(MouseEvent me) {
mapMuis=false;
}
});
但是,當我的鼠標進入jscrollpane時我沒有輸出。
謝謝你的時間。
解決方案: 我chukked出的MouseListener和實施MOUSEMOTION:
jScrollPane1.addMouseMotionListener(new MouseMotionListener() {
@Override
public void mouseDragged(MouseEvent me) {
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}
@Override
public void mouseMoved(MouseEvent me) {
pointer = MouseInfo.getPointerInfo();
point = pointer.getLocation();
color = robot.getPixelColor((int) point.getX(), (int) point.getY());
System.out.println("Color at: " + point.getX() + "," + point.getY() + " is: " + color); //To change body of generated methods, choose Tools | Templates.
}
});
那麼,爲什麼你需要一個線程,爲什麼不使用MouseListener和MouseMotionListener的組合,所以你可以使用tr確認進入和退出事件並更新mouseMoved事件的RGB值? – MadProgrammer
作爲一個常規的調試技巧,嘗試添加printlns,而這些事件並不像你期望的那樣工作。也就是說,你在'doInBackground'方法中有一個,但爲什麼不在'mouseEntered'中有一個,所以你知道部分管道工作? –
調用return方法將退出您的方法,這意味着您只會從doInBackground方法中獲得一個循環。相反,你應該使用發佈和處理方法 – MadProgrammer