Qt → Qt/C++ - Lesson 027. Polymorphism in Qt by the example of geometric shapes in QGraphicsScene

QGraphicsScene, Qt уроки, figure, QGraphicsItem, ооп, Полиморфизм, пример, Qt, square, triangle

Polymorphism is one of the paradigms of OOP (Object Oriented Programming). Polymorphism implements the ability to provide base-class properties and methods, the implementation of which is not known for future classes that inherit from this class. That is the base …

Qt → Qt/C++ - Lesson 030. QCustomPlot – Introduction into working with charts

график, QCPItemTracer, Qt5, QCPCurve, QCustomPlot

Constantly I hear about QCustomPlot on working with graphs to Qt, but on the start of the made in one my application I worked without special libraries, and now in a same moment decided to get acquainted with this library. …

QML → QML - Lesson 019. Navigation Drawer in Qt Qml Android

Navigation Drawer, Qt, QtQuick, Qndroid, QML

One of the key controls in the Android app is the Navigation Drawer , but QML component is not ready for this item, but the guys from Cutehacks made your Navigation Drawer , the code of the component is laid …

QML → QML - Lesson 018. Loader in QML Qt – The working with the dynamic components

QML, QtQuick, Qt, Loader

For the organization of the dynamic components of the change is convenient to use a Loader component, which is included in QML QtQuick and is a container for components in your application, let's say that you need to periodically replace …

QML → QML - Lesson 017. Export data into CSV format from data model in QML Qt

CSV, Qt, QML, EXCEL

In that case, if you need to unload the table data from an application to a CSV file, the interface is more and is written in the QML, then hasten to this article, to give a little hint.

For example, …

Qt → Qt/C++ - Lesson 029. Picture in database in Qt – Saving and Loading

SQL, изображение, QPixmap, база данных, Qt, BLOB, SQLite

Images in the database can be stored in BLOB format ( Binary Large Object ), that is an array of binary data format. BLOB format is also suitable for storing audio and video data in databases.

Consider the saving and …

QML → QML - Lesson 016. SQLite database and the working with it in QML Qt

Qt, Android, View, Model, SQLite, MVC, База данных, DataBase, QML

A small example to work with the database in QML Qt. This lesson brings together information on the use of signals and slots in the Qt QML , access to C++ classes from QML layer implementation of the application interface …

Qt → Qt/C++ - Lesson 040. Types of data in different Databases in Qt

Qt, SQL, INTEGER, типы данных, DECIMAL, MS SQL

In the process of application development for Qt, which will have to work with databases, you must take into account the nuance that Qt driver target Databases may not support all types of data that you can lay in your …

Qt → Qt/C++ - Lesson 039. How to paint stroke in QSqlTableModel by value in the column?

Qt, paint, QSqlTableModel

In the lesson on working with QSqlTableModel was detailed mapping table data from a SQL database. But with the question from one of the readers, do a small addition to this example.

The question was how to paint an entire …

QML → QML - Lesson 015. Development QML Data Mapper – Analog of QDataWidgetMapper

QDataWidgetMapper, QMLDataMapper, Qt, QML, mapper

In the process of transferring a GUI softiny with QWidgets on QML QDataWidgetMapper found no analogue for QML. This fact was somewhat spoiling the mood. But there was nothing, but to look for other ways to implement or make their …

QML → QML - Lesson 013. Positioning with Anchors

left, centerIn, bottom, Qt, anchors, right, top, QML

In addition to the more traditional Grid , Row , and Column , Qt Quick also provides a way to layout items using the concept of anchors . Each item can be thought of as having a set of 7 …

QML → QML - Lesson 012. Data transmission from the TextInput in ListView (Model / View)

TextInput, ListView, ListModel, Qt, Android, View, Model, QML, Delegate

Working with the ListView in QML is a fairly common aspect in the development of Android applications, since many applications have in their functional building lists of data, records, settings, etc. It is also true in developing a Desktop applications …