event-handling

问题 I know about EventInfo.AddEventHandler(...) method which can be used to attach handler to an event. But what should be done if i can not even define proper signature of the event handler, as in, i don't even have reference to the event args expected by the handler? I will explain the problem with the proper code. // Scenario when I have everything available in my solution, Zero Reflection Scenario. internal class SendCommentsManager { public void Customize(IRFQWindowManager rfqWindowManager)

问题 This question is asked often, but never really answered well. Let's see if we can remedy it! Event Propagation Google allows you to bind to events in a Google Map View via their API using event handlers. Sometimes you may bind your event handler to an event that Google itself is already bound to. Thus, when your event fires and does whatever you told it to do you may find Google also doing its own little thing at the same time. Hmm, can I handle the event so my code runs, but stop the event

问题 How can i get hold of the instantiating object from a constructor in java? I want to store reference to the parent object for some GUI classes to simulate event bubbling - calling parents handlers - but i dont wanna change all the existing code. 回答1: Short answer: there isn't a way to do this in Java. (You can find out what class called you, but the long answer below applies there for the most part as well.) Long answer: Code that magically behaves differently depending on where it's being

问题 How can i get hold of the instantiating object from a constructor in java? I want to store reference to the parent object for some GUI classes to simulate event bubbling - calling parents handlers - but i dont wanna change all the existing code. 回答1: Short answer: there isn't a way to do this in Java. (You can find out what class called you, but the long answer below applies there for the most part as well.) Long answer: Code that magically behaves differently depending on where it's being

问题 So I've tried the MSAPI 5.4 TTS with event example. Now I create an cmd prompt app that utilize the SetNotifyCallbackFunction but the function that I've pass is not being called. I'm not an expert in C++ so I am having difficulty in solving this one, can anyone point me in the right direction or at least give me a good example of SetNotifyCallbackFunction? Here is a simplified version of my code: typedef void __stdcall SPNOTIFYCALLBACK(WPARAM wParam, LPARAM lParam); void __stdcall

问题 I'm trying to make the app read data from a socket, but it takes some time and locks the interface, how do I make it respond to tk events while waiting? 回答1: Thats is easy! And you don’t even need threads! But you’ll have to restructure your I/O code a bit. Tk has the equivalent of Xt’s XtAddInput() call, which allows you to register a callback function which will be called from the Tk mainloop when I/O is possible on a file descriptor. Here’s what you need: from Tkinter import tkinter

问题 Let's say we have a pretty standard form with a textbox and a button (for simplicity). You want to handle a Click event and do some stuff based on user's input. I was wondering, does it matter, when exactly you wire up an event handler for the Click event in a code-behind? If it does, where is the best place to put it? Page load? Page init? I've tried both places, but didn't notice any difference. Or it's just a personal preference of the programmer? I've already searched the internet couple

问题 I'm trying to implement a double-tap zoom like function in my MapView. The event always fires the first time, but never subsequent times. Below is my code. I have a feeling it has something to do with the map controller getting lost after the first time the event is fired. import android.os.Bundle; import android.view.MotionEvent; import android.view.View; import android.view.View.OnTouchListener; import com.google.android.maps.MapActivity; import com.google.android.maps.MapController; import

问题 I'm using a ContextMenuStrip for multiple controls and I'm trying to figure out the best way to get the control that was actually clicked on to open the Context Menu. The sender just gives the ToolStripMenuItem reference, which has an Owner property that references the ContextMenuStrip , but I cannot figure out how to tell which control the click came from. There must be a simple way to check this, right? I'm checking it in the ToolStripMenuItem 's click event. Friend WithEvents mnuWebCopy As

问题 I was trying to implement the CTRL + S feature for a browser based application.I made a search and came across 2 scripts in the following to questions Best cross-browser method to capture CTRL+S with JQuery? Ctrl+S preventDefault in Chrome However,when I tried to implement it,it worked but,I still get the default browser save dialog box/window . My Code:For shortcut.js shortcut.add("Ctrl+S",function() { alert("Hi there!"); }, { 'type':'keydown', 'propagate':false, 'target':document }); jquery