propertychangelistener

来源： https://stackoverflow.com/questions/22224000/how-to-fire-property-change-listener-if-old-and-new-values-are-equal-in-swing-jc

来源： https://stackoverflow.com/questions/22224000/how-to-fire-property-change-listener-if-old-and-new-values-are-equal-in-swing-jc

问题 I'm working with jdesktop's beansbinding library in Netbeans 7.3. I have a really specific question. I'd like to have a JButton enabled if any property of another bean is not null and disabled if it's null. So I tried to create an ELBinding (which has conditional support like ${myProperty > 50} returning a boolean holding whether this expression is true or not. But in my occasion I cannot figure out (nor find on the internet) how to write down this condition. If I had an event listener for

问题 I have code which I have been using for years and this morning I noticed property change isn't being called when the task is done. I've got the swing worker set up as an inner class and I put a break point on the String properyName = evt..... and it never hits the break point. void loadData() { work2 = new bkgdLoadData(); work2.addPropertyChangeListener(new PropertyChangeListener() { @Override public void propertyChange(PropertyChangeEvent evt) { String propertyName = evt.getPropertyName();

问题 EDIT at end of post Test Code and Output import java.awt.EventQueue; import java.beans.PropertyChangeEvent; import java.beans.PropertyChangeListener; import java.text.NumberFormat; import javax.swing.JFormattedTextField; import javax.swing.JOptionPane; import javax.swing.JPanel; import javax.swing.text.NumberFormatter; public class Test{ private JFormattedTextField input, input2; private NumberFormatter formatter; private PropertyChangeListener listener; public Test(){ formatter = new

问题 I am not writing "what did I try" or "what is not working" since I can think of many ways to implement something like this. But I cannot believe that no one did something similar before and that is why I would like to ask the question to see what kind of Doctrine2 best practices show up. What I want is to trigger an event on a property change. So let's say I have an entity with an $active property and I want a EntityBecameActive event to fire for each entity when the property changes from

问题 How to Override PropertyChangedCallback of a predefined Dependency Property ItemsSource in a WPF ItemsControl . I developed a WPF Custom Control inherited from ItemsControl . In that I used the predefined Dependency Property ItemsSource . In that I need to monitor and check data once the Collection gets updated. I searched a lot in google, but I can't able to find any related solution to fulfill my requirement. https://msdn.microsoft.com/en-us/library/system.windows.controls.itemscontrol

问题 I can use an extractor ( Callback<E, Observable[]> extractor ) to make a ListProperty fire change events if one of its elements changed one of its properties (update event). Update Change Event in ObservableList Is there an equivalent for ObjectProperty<> ? I have an SimpleObjectProperty which I want to fire events when properties of it's value (another bean type) change (update change events). Sample code: public class TestBean { public static <T extends TestBean> Callback<T, Observable[]>

问题 I want that main should print hello (in a pop up dialogue box) everytime the button is clicked. So I designed the following program but it doesn't seem to work. The program compiles and executes just fine but when I click the button, I don't see the any dialogue box popping up. I have put in place the getter and setter of the boolean variable (button_clicked) whose value is being tested in the main() block. Please help if you know.. import javax.swing.*; import java.awt.event.ActionEvent;

问题 I am trying to fire events from inner class, but it is not working. This is my code: ABSTRACT MODEL: public abstract class AbstractModel { public PropertyChangeSupport propertyChangeSupport; public AbstractModel() { propertyChangeSupport = new PropertyChangeSupport(this); } public void addPropertyChangeListener(PropertyChangeListener listener) { propertyChangeSupport.addPropertyChangeListener(listener); } public void removePropertyChangeListener(PropertyChangeListener listener) {