Qt

Show message if Qt5Widgets_DIR is not set

if (NOT CMAKE_PREFIX_PATH AND NOT Qt5Widgets_DIR)
    message("CMAKE_PREFIX_PATH is not defined, you may need to set it "
            "(-DCMAKE_PREFIX_PATH=\"path/to/Qt/lib/cmake\" or -DCMAKE_PREFIX_PATH=/usr/include/{host}/qt{version}/ on Ubuntu)")

    message("CMAKE_PREFIX_PATH is not defined."
            "find_package(Qt5) is probably not going to work. "
            " Set the CMAKE_PREFIX_PATH environment variable to the install prefix of Qt 5"
            " - Set it in the command line as -DCMAKE_PREFIX_PATH=\"path/to/Qt5/lib/cmake\""
            " - Or set it in your build script with set(CMAKE_PREFIX_PATH path/to/Qt5/lib/cmake)")
endif ()

Find Qt

1	`find_package(Qt5 COMPONENTS Widgets QUIET)`

Enable MOC

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set(CMAKE_AUTOMOC ON)
set(CMAKE_AUTORCC ON)
set(CMAKE_AUTOUIC ON)

Link Qt

1 2	`add_executable(qt_helloworld qt_hello.cpp) target_link_libraries(qt_helloworld Qt5::Widgets)`

Disable MOC

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set(CMAKE_AUTOMOC OFF)
set(CMAKE_AUTORCC OFF)
set(CMAKE_AUTOUIC OFF)

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Headers

1 2	`#include <QApplication> #include <QPushButton>`

Create Qt Application

1	`QApplication app(argc, argv);`

Create window

1 2	`QWidget window; window.setFixedSize(100, 80);`

Create button and attach to window

1 2	`auto *buttonInfo = new QPushButton("Info", &window); buttonInfo->setGeometry(10, 10, 80, 30);`

Set button callback

1 2	`QApplication::connect(buttonInfo, &QPushButton::clicked, [] { std::cout << "Info" << std::endl; });`

Create quit button

1 2	`auto *buttonQuit = new QPushButton("Quit", &window); buttonQuit->setGeometry(10, 40, 80, 30);`

Set quit button callback

1 2	`QApplication::connect(buttonQuit, &QPushButton::clicked, [] { QApplication::quit(); });`

Run application

1 2	`window.show(); return app.exec();`

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