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DjangoDjango - Tutorial 054. How to create a polymorphic system of dynamic widgets

May 9, 2020, 5:09 a.m.

dynamic, django

The other day, I solved the problem of adding dynamic widgets on the site with the ability to add different types of widgets, as well as with the possibility of further unlimited expansion of the widget set by adding models of specific implementations.

The system is such that there is one class Widget , which, depending on the type selected when creating it, refers to a specific implementation model, for example HTMLWidgetImpl , which contains some special parameters, and also knows about its template for rendering. Widget in the site template when calling the render() method refers to the specific implementation and its method render()** through the type.

This approach allows you to write an extremely simple code for the template, as well as organize the code so that adding new widgets will consist in adding a new data model, as well as correcting a number of places in the code, or rather updating them. Which in essence will become a routine task and will remove from the programmer the need to come up with something new.

That is, in this article I want to show not only the solution to some problem at the level of program code, but also to show the approach to architecture planning when solving such problems.

QtQt/C++ - Tutorial 083. Creating a dynamic library and connecting it to another project

Oct. 9, 2018, 2:16 p.m.

Qt, DLL, dll, Windows, dynamic

The forum raised the question of how to create a dynamic library and correctly connect it to a third-party project. Periodically, such questions arise, so consider one option of creating a dynamic dll for Windows using the standard wizards in Qt Creator.

In this case, the option will not be considered when the project is divided into subprojects, which are compiled as libraries and then connected to the main project. Because it will be the dynamic internal libraries of the project. Let's create exactly the external library, which theoretically could be distributed in the form of binaries.

Create two projects:

  1. QuiLib - this will be an external dynamic library that will contain one dialog box. This dialog box will open in the main project.
  2. WithDynamicLibrary - the project that will be used to connect this dynamic library.

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I am Evgenii Legotckoi, developer of EVILEG. And it is my hobby project, which helps to learn programming another programmers and developers

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