Компания Qt уже давно использует такие тесты, как QMLBench, которые помогают нам узнать, когда изменение вызывает снижение производительности, но также важно видеть, как Qt работает на более высоком уровне, позволяя компонентам взаимодействовать таким образом, чего детальные тесты, такие как QMLBench не могут нам показать этого. В этой статье мы рассмотрим результаты тестирования запуска нового приложения из более реального приложения для тестирования QML.

After Hello World on Flutter write an application with two screens:

• SplashScreen - Application Input Screen
• HomeScreen - Home screen application

Interestingly, Flutter has a navigation system for the windows (pages) of the application. This is somewhat similar to the route system in Django to determine which View to call.

In fact, in this application, we will need to call the MaterialApp widget, which accepts the routes route system, which will determine which windows to open. The first window will be SplashScreen , after two seconds it will have to open HomeScreen .

I share my implementation of built-in tags to form breadcrumbs with support for schema.org markup, as well as support for bootstrap css.

Wrote these tags to speed up site development speed. Now the work moves much faster, because the code has become more compact, and correcting errors in the breadcrumbs markup has become much easier, since now you only need to correct the code in one place.

Flutter is a fresh framework from Google for application development for Android and iOS. The programming language used is Dart (also developed by Google).

Let's understand the launch of our first application on Flutter.

In Django - Lesson 035. Different templates for rendering different types of content in search results it was shown how to render different templates depending on what type of content drawn in the search results on the site. In this case, the key point was that it was not necessary to make the verification conditions for the selection of the template. The information about the balbalon was stored in the variable TEMPLATE_PREVIEW, through which the template was inserted into the include tag in the Django template.

{% include object.TEMPLATE_PREVIEW %}

In this method there is one big drawback. The fact is that the include tag with each of its calls is looking for a template. With a large load on the site - this can significantly increase the duration of the response from the server. To solve this problem, you need to somehow cache the pattern. Since different types of content use different templates, to do this using inclusion_tag is quite problematic.

This problem was solved by caching the template at the class level as a class variable.

Всех приветствую на продолжении темы работы со snap пакетами. Очень часто бывает так, что разработчику требуется узнать все зависимости приложения. И это не просто узнать, имеет ли одна библиотека в зависимости другую.

I propose to write a small console program that will perform one task at regular intervals.

For example, the program starts and makes 10 samples within 10 seconds, while the program will display information about the number of the countdown in the console.

The program will work as follows.

What is memory Leaks in Android development ?

The application creates objects, they lie in memory and can not clean out after the completion of its work.

Why is this happening ?

Java has its own means of clearing memory from unused items. This is garbage collection .

The garbage collector marks all objects that can be deleted if they are not referenced. Memory leak - this is just a lost reference, which shows that the object can not be deleted.

The complexity of this bug is that until a certain time it is not visible and it can not interfere. There's a good quote from Benjamin Franklin: “A small leak will sink a great ship." Memory leaks take the RAM of the application. The amount of raw memory will grow and may one day cause your app to slow down and crash . This will lead to user dissatisfaction and most likely the app will be removed...

Привет. Не давно была задача реализовать боковое меню со списком каталогов; что бы его можно было вставить в любое место и в любую страницу! Проблема заключалась в том что список большой и для того что бы он не нагружал сервак я его закэшировал, но тут не буду указывать как закэшировал так как писать придется долго... В общем буду описывать все по порядку!

To improve the ability to display information about users in the administrative panel of the site, implemented the ability to display user avatars, both in the special UserProfile model that has One-To-One relationship to the User model, and in the User model itself, it added an avatar display via inline form.

It looks like this:

List of user profiles