event-handling | 易学教程

How do you listen for mouse paste done in a TextField using JavaFX?

阅读更多关于 How do you listen for mouse paste done in a TextField using JavaFX?

问题 Copy text into your clipboard, right click text field and press "paste", is there a way how to listen when paste was clicked? Or rather that input text in the field changed after something was pasted this way. Because these do not work in this particular case: setOnKeyReleased() setOnInputMethodTextChanged() 回答1: The "paste" functionality is implemented in the TextInputControl superclass of TextField in public void paste(). So, while it's not really an event-driven or MVC approach, you can

PyQt Event Handling and QErrorMessage: detect the source of the click

阅读更多关于 PyQt Event Handling and QErrorMessage: detect the source of the click

问题 I'm new to Python and Qt, and I have the following problem: I have rewritten the event handler of class mywin(QMainWindow): , so that when I click on it, a command should execute. Howewer, when the command returns an error, I would like to show an error message using QErrorMessage . Howewer, when I click on the OK button of the Error Message, an other click event is registred and the command reexecutes, errors and shows a new error message, so I can't ever quit the error messages (Everytime I

Implement Postsharp EventInterceptionAspect to prevent an event Handler hooked twice

阅读更多关于 Implement Postsharp EventInterceptionAspect to prevent an event Handler hooked twice

问题 If you subscribe the .net event with the same subscribe more then once, then your subscribed method will be called the same times as subscribed. And if you unsubscribe just once, then it will be just one minus to the call. Meaning you have to unsubscribe same no of times as subscribed, otherwise u will be keep informed. Somtimes you don't want to do it. In order to to prevent an event Handler to be hooked twice, we can implement event as following. private EventHandler foo; public event

Why is there no IsReadOnlyChanged event on TextBox controls?

阅读更多关于 Why is there no IsReadOnlyChanged event on TextBox controls?

问题 I was adding some workaround code to fix the bug outlined in Is this a bug in DotNet 4 WPF Spell Checking?, (When a WPF TextBox changes Enabled, Visible or ReadOnly states, any SpellCheck custom dictionaries get dropped off until you disable and re-enable SpellCheck) and the simplest fix seemed to be to handle the IsVisibleChanged , IsEnabledChanged , and IsReadOnlyChanged events. Simple, right? Except there is no IsReadOnlyChanged event. Anybody know why and what the best way to trap a

Catch all events in iframe jQuery and replicate

阅读更多关于 Catch all events in iframe jQuery and replicate

this is the question: I have an iframe that displays any web page (not necessarily developed by me). On this page may be attached events (which presumably I do not know). how can I dynamically intercepting these events and store them for later replicate? for example: suppose that when the mouse moves over a certain div it changes color. I would like to make sure that when you trigger the event that would change color to the div it is "registered" with all A series of information that will allow me (without user interaction) to replicate it at a later time. ideas? for both the recording and

What is the standard approach for event handling in case of Visual Inheritance?

阅读更多关于 What is the standard approach for event handling in case of Visual Inheritance?

问题 We know that when a Form is visually inherited, all of its controls are locked in design time. This problem requires that we place event handlers in the base form. Now what should I do if I want to place base-control event handlers in the derived Form? Since the controls are locked, approach of double clicking on the control to add an event-handler should not work. What is the industry-standard approach for event handling in case of Visual Inheritance? 回答1: The designer honors the access

EnvironmentEvent macro doesn't complete

阅读更多关于 EnvironmentEvent macro doesn't complete

问题 I'm working in Visual Studio 2008 and I would like for Edit > Outlining > Collapse to Definitions to be run whenever I open a file. It would be nice if, after that, all regions were expanded. I tried the code that Kyralessa offered in a comment on The Problem with Code Folding, and that works very nicely as a macro that I have to run manually. I tried to expand this macro to act as an event by placing the following code in the EnvironmentEvents module in the Macro IDE: Public Sub

Java Event Binding

阅读更多关于 Java Event Binding

问题 I'm new in windows application development using java. The question is this "How to i bind events to custom class methods? As fas i have seen i can register listener classes to swing components to handle events. That is OK but i have to implement a class that implements e.g. the ActionListener interface to handle an event and then implement the actionPerformed method. That means ONE class FOR each event i have to handle? Can't i have ONE class "listening" for events from all components and

What is the standard approach for event handling in case of Visual Inheritance?

阅读更多关于 What is the standard approach for event handling in case of Visual Inheritance?

We know that when a Form is visually inherited, all of its controls are locked in design time. This problem requires that we place event handlers in the base form. Now what should I do if I want to place base-control event handlers in the derived Form? Since the controls are locked, approach of double clicking on the control to add an event-handler should not work. What is the industry-standard approach for event handling in case of Visual Inheritance? The designer honors the access modifiers on the base class members. You must change the Modifiers property of the base form's control from

Why am I getting an Argument exception when creating event handler dynamically?

阅读更多关于 Why am I getting an Argument exception when creating event handler dynamically?

问题 Good day all I wrote the following method: private void RegisterEvent(object targetObject, string eventName, string methodName) { EventInfo eventInfo = targetObject.GetType().GetEvent(eventName); MethodInfo method = eventInfo.EventHandlerType.GetMethod("Invoke"); IEnumerable<Type> types = method.GetParameters().Select(param => param.ParameterType); DynamicMethod dynamicMethod = new DynamicMethod(eventInfo.EventHandlerType.Name, typeof (void), types.ToArray(), typeof (QueryWindow)); MethodInfo