Many widgets include events which can fire callback functions when the user interacts with the widget. For example when a button is pressed, a checkbox checked, or a dropdown chosen you can fire a function.
The exact flag which is associated with these event depends on the widget, but a typical cal...
For this demonstration we will use service broker construction created in another part of this documentation. Mentioned part is called 3. Create basic service broker construction on database (single database communication).
First we need to create a procedure that is able to read and process data f...
public async Task SetProductInactiveAsync(int productId)
{
using (IDbConnection con = new SqlConnection("myConnectionString"))
{
await con.ExecuteAsync("SetProductInactive", new { id = productId },
commandType: CommandType.StoredProcedure);
...
Avoid calling methods using strings that can accept methods. This approach will make use of reflection that can slow down your game especially when used in the update function.
Examples:
//Avoid StartCoroutine with method name
this.StartCoroutine("SampleCoroutine");
//Ins...
Lists as arguments are just another variable:
def func(myList):
for item in myList:
print(item)
and can be passed in the function call itself:
func([1,2,3,5,7])
1
2
3
5
7
Or as a variable:
aList = ['a','b','c','d']
func(aList)
a
b
c
d
18.0
By default, any function specified in a -callback directive in a behaviour module must be exported by a module that implements that behaviour. Otherwise, you'll get a compiler warning.
Sometimes, you want a callback function to be optional: the behaviour would use it if present and exported,...
Where we came from
Sometimes we can't provide all of the required metadata needed for the XmlSerializer framework in attribute. Suppose we have a base class of serialized objects, and some of the derived classes are unknown to the base class. We can't place an attribute for all of the classes which...
A common usecase is to discard certain rest-calls, that are not needed any more after certain user-inputs. The most prominent example would be, when a user uses some search-function, makes a request, makes another request and for some reason the first request arrives after the second request and the...
This:
class Villain(val minions: Map[String, Minion]) extends Dynamic {
def applyDynamic(name: String)(jobs: Task*) = jobs.foreach(minions(name).do)
def applyDynamicNamed(name: String)(jobs: (String, Task)*) = jobs.foreach {
// If a parameter does not have a name, and is simply given, th...
// Takes a callback and executes it with the read value
def readFile(path: String)(callback: Try[String] => Unit): Unit = ???
readFile(path) { _.flatMap { file1 =>
readFile(path2) { _.foreach { file2 =>
processFiles(file1, file2)
}}
}}
The function argument to readFile is...
It is often necessary to execute a long-running task and use the result of that task once it has completed.
In this example, we will create two classes: One which implements the Callable<T> interface (where T is the type we wish to return), and one which contains a main() method.
AsyncValueT...
The Java Native Interface (JNI) allows you to call Java functions from native code. Here is a simple example of how to do it:
Java code:
package com.example.jniexample;
public class JNITest {
public static int getAnswer(bool) {
return 42;
}
}
Native code:
int getTheAnswer(...
There are specific scenarios where in we might need to create a Quartz scheduler,based on user input on when a scheduler should be triggered,apart from we can handle cases,where we have certain pre-defined functionalities,which need to be triggered based on user action,at a certain period.
This exa...
Register C++ classes in QML
At C++ side, imagine we have a class named QmlCppBridge, it implements a method called printHello().
class QmlCppBridge : public QObject
{
Q_OBJECT
public:
Q_INVOKABLE static void printHello() {
qDebug() << "Hello, QML!";
}
};
...
SWIFT:
Getting an instance of UIStoryboard programmatically can be done as follows:
let storyboard = UIStoryboard(name: "Main", bundle: nil)
where:
name => the name of the storyboard without the extension
bundle => the bundle containing the storyboard file and its relate...
Callback functions in JavaScript
Callback functions are common in JavaScript. Callback functions are possible in JavaScript because functions are first-class citizens.
Synchronous callbacks.
Callback functions can be synchronous or asynchronous. Since Asynchronous callback functions may be more c...
Callback hell (also a pyramid of doom or boomerang effect) arises when you nest too many callback functions inside a callback function. Here is an example to read a file (in ES6).
const fs = require('fs');
let filename = `${__dirname}/myfile.txt`;
fs.exists(filename, exists => {
if (exi...
The idea is to measure a layout before and after each change and if there is a significant change you can be somewhat certain that its the softkeyboard.
// A variable to hold the last content layout hight
private int mLastContentHeight = 0;
private ViewTreeObserver.OnGlobalLayoutListener keyboa...
