Hello World! example

Rationale

The Hello World! extension is an example of the simplest extension that implements its own GUI, in this case a dialog box with a button and a label.

Overview

The extension consists of five files located in libavogadro/examples/thirdPartyExtensions/01-HelloWorld/:

• CMakeLists.txt:
  • The CMake input file that sets up the build environment.

• helloworldextension.cpp
• helloworldextension.h
  • These contain the HelloWorldExtension class which inherits Avogadro::Extension. This is where the actual work of the extension is typically performed.

• helloworlddialog.ui
  • This is the Qt Designer input file that contains the GUI layout.
• helloworlddialog.cpp
• helloworlddialog.h
  • These contain the HelloWorldDialog class, which implements support for the GUI described by helloworld.ui

Specifics

There is no algorithmic complexity to explain here, examining the comments in the source files should be sufficient. As a bare example of an Avogadro extension, the Hello World code serves as a basis for the more advanced examples in the tutorial.

Next Steps

If you're feeling adventurous, try out the following:

• Change the "Hello world!" text on the dialog.