QML → QML - Lesson 026. Intents with Qt for Android, part 1

QML, Qt, Android, Intent

The “ intent ” is the main facility for interprocess communication on Android. Basically, an intent is an object that is processed by the operating system and then passed to one or more of the installed applications based on its …

Qt → Qt/C++ - Lesson 051. QMediaPlayer – simple audio player

QStandardItemModel, QMediaPlayer, QMediaPlaylist, Qt, аудио плеер

I suggest to write a simple audio player for mp3 files using Qt/C++, which will have a playlist, the ability to start / pause / stop tracks, as well as scroll through the tracks.

For the implementation of this ideas …

Ruby → User Guide #20 - Ruby - global variables

global variables, Ruby, ruby lesson, ruby уроки, user guide, глобальные переменные, руководство пользователя

A global variable has a name beginning with $. It can be referred to from anywhere in a program. Before initialization, a global variable has the special value nil.

ruby> $foo
   nil
ruby> $foo = 5
   5
ruby> $foo
   5 …

Ruby → User Guide #19 - Ruby - variables

Ruby, ruby lesson, ruby уроки, user guide, variables, переменные, руководство пользователя

Ruby has three kinds of variables, one kind of constant and exactly two pseudo-variables. The variables and the constants have no type. While untyped variables have some drawbacks, they have many more advantages and fit well with ruby's quick and …

Ruby → User Guide #18 - Ruby - procedure objects

procedure objects, Ruby, ruby lesson, ruby уроки, user guide, процедурные объекты, руководство пользователя

It is often desirable to be able to specify responses to unexpected events. As it turns out, this is most easily done if we can pass blocks of code as arguments to other methods, which means we want to be …

Qt → Qt Certification

Qt, QML, Certification, Сертификация

Since 2009 it has been possible to pass the Qt certification exam and become a Certified Qt Developer or Qt Specialist. The exams and certifications have now been updated to cover the latest Qt features. In order to support quality …

Ruby → User Guide #17 - Ruby - modules

modules, Ruby, ruby lesson, ruby уроки, user guide, модули, руководство пользователя

Modules in ruby are similar to classes, except:

• A module can have no instances.
• A module can have no subclasses.
• A module is defined by module ... end

Actually... the Module class of module is the superclass of the Class …

Ruby → User Guide #16 - Ruby - Singleton methods

method, Ruby, ruby lesson, ruby уроки, singleton, user guide, руководство пользователя

The behavior of an instance is determined by its class, but there may be times we know that a particular instance should have special behavior. In most languages, we must go to the trouble of defining another class, which would …

Ruby → User Guide #15 - Ruby - access control

access control, Ruby, ruby lesson, ruby уроки, user guide, контроль доступа, руководство пользователя

Earlier, we said that ruby has no functions, only methods. However there is more than one kind of method. In this chapter we introduce access controls .

Consider what happens when we define a method in the "top level", not …

Ruby → User Guide #14 - Ruby - Redefinition of methods

Ruby, ruby lesson, ruby уроки, user guide, переопределение методов, руководство пользователя

In a subclass, we can change the behavior of the instances by redefining superclass methods.

ruby> class Human
    |   def identify
    |     print "I'm a person.\n"
    |   end
    |   def train_toll(age)
    |     if age < 12
    |       print "Reduced fare.\n"; …