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我的問題是，當我從我的模型屬性更改值時，PropertyChangeSupport激發，但視圖中的PropertyChangeListener永遠不會到達。 所以我想我通過添加偵聽器使錯誤。PropertyChangeListener列表中的對象
任何類型的輸入表示讚賞。
package stackOverflow.allInOne;
import java.awt.FlowLayout;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;
import static java.lang.System.getProperty;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
import javax.swing.WindowConstants;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
public class AllInOne {
public static void main(String[] args) {
final Model Model = new Model();
final Controller Controller = new Controller(Model);
Controller.initializeView();
}
}
class View extends JFrame{
private final Model model;
private final Controller controller;
JTextField fldAny;
JButton btnAny;
public View(Model model, Controller controller) {
super("SBB app");
this.model = model;
this.controller = controller;
}
public void createAndShow() {
initializeComponents();
JPanel contents = layoutComponents();
addActionEvents();
addPropertyChangeListeners();
add(contents);
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
pack();
setVisible(true);
}
private void initializeComponents() {
fldAny = new JTextField("----------");
btnAny = new JButton("klick me");
}
private JPanel layoutComponents() {
JPanel anyPanel = new JPanel(new FlowLayout());
anyPanel.add(fldAny);
anyPanel.add(btnAny);
return anyPanel;
}
private void addActionEvents() {
fldAny.getDocument().addDocumentListener(new DocumentListener() {
@Override
public void changedUpdate(DocumentEvent e) {
change();
}
@Override
public void insertUpdate(DocumentEvent e) {
change();
}
@Override
public void removeUpdate(DocumentEvent e) {
change();
}
public void change() {
System.out.println("action event fired");
controller.setNewValue(fldAny.getText());
}
});
}
private void addPropertyChangeListeners() {
PropertyChangeListener myListener = new MyPropertyChangeListener(this);
List<Model2> xx = model.getAllModel2();
for(Model2 x : xx){
x.addPropertyChangeListener(Model2.BTN_TXT, myListener);
}
}
}
class MyPropertyChangeListener implements PropertyChangeListener{
private View view;
public MyPropertyChangeListener(View view) {
this.view = view;
}
@Override
public void propertyChange(PropertyChangeEvent evt) {
System.out.println(evt);
System.out.println("Receved the fire");
view.btnAny.setText(view.btnAny.getText() + "1");
}
}
class Model2{
private String fldText;
private String btnText;
public static final String BTN_TXT = "btnText";
private final PropertyChangeSupport pcs = new PropertyChangeSupport(this);
Model2(String fldText, String btnText) {
this.fldText = fldText;
this.btnText = btnText;
}
public void setFldText(String fldText) {
this.fldText = fldText;
}
public String getFldText() {
return fldText;
}
public String getBtnText() {
return btnText;
}
public void setBtnText(String btnText) {
System.err.println("Model fires");
pcs.firePropertyChange(BTN_TXT, btnText, this.btnText = btnText);
}
public void addPropertyChangeListener(PropertyChangeListener listener) {
pcs.addPropertyChangeListener(listener);
}
public void addPropertyChangeListener(String propertyName, PropertyChangeListener listener) {
System.out.println("Listener wird zu " +listener.toString() + " hinzugefügt mit property " + propertyName);
pcs.addPropertyChangeListener(propertyName, listener);
final Object value = getProperty(propertyName);
listener.propertyChange(new PropertyChangeEvent(this, propertyName,
value, value));
}
public void removePropertyChangeListener(PropertyChangeListener listener) {
pcs.removePropertyChangeListener(listener);
}
public void removePropertyChangeListener(String propertyName, PropertyChangeListener listener) {
pcs.removePropertyChangeListener(propertyName, listener);
}
public PropertyChangeListener[] getPropertyChangeListeners() {
return pcs.getPropertyChangeListeners();
}
public PropertyChangeListener[] getPropertyChangeListeners(String propertyName) {
return pcs.getPropertyChangeListeners(propertyName);
}
}
class Model {
private List<Model2> model2List = new ArrayList<Model2>();
public Model() {
model2List.add(new Model2("fldText","btnText"));
}
public Model2 getSelectdModel2(){
return model2List.get(0);
}
List<Model2> getAllModel2() {
return model2List;
}
}
class Controller {
private final Model model;
public Controller(Model model) {
this.model = model;
}
public void initializeView() {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
View view = new View(model, Controller.this);
view.createAndShow();
}
});
}
void setNewValue(String text) {
System.out.println("Controller sets new value");
model.getSelectdModel2().setBtnText(text);
}
}
我目前得到以下輸出，當我啓動應用程序：
監聽wird祖 [email protected]ügt MIT財產btnText java.beans.PropertyChangeEvent中[propertyName的= btnText;屬性oldValue = NULL; newValue = null; propagationId = NULL; [email protected]] Receved火
所以我是一個有點困惑爲什麼我收到這起火災是因爲我設置btnTxt的我加入聽者前值。無論如何，如果我改變在該領域的文本，然後我得到以下輸出：
動作觸發的事件控制器樹立了新的價值模型激發
所以，在我最初的問題中提到它似乎我的那個
x.addPropertyChangeListener(Model2.BTN_TXT, myListener);
並不總是有效。
1的PropertyChangeListener /支持是這裏非常好，在描述一些外觀極好的情況下，搜索通過....點擊PropertyChangeListener標籤，然後返回基於SSCCE的問題，簡短，可運行，可編譯，在你的問題中描述的所有內容都是大約30-50條代碼行。主要類3.這個問題是不是沒有重要的細節（閱讀Oracle教程有關），我錯過你的問題 – mKorbel
謝謝mKorbel爲tipps我搜索像一個瘋子，但也許我要過度或轉儲找到我的問題在我自己的。所以寫了一個關於我的問題的代碼示例。我希望這有幫助。 – user3104185
不是SSCCE，不知道你的問題在哪裏，在你的模型或控制器和視圖之間的錯誤通知或... ???， – mKorbel