Development/Tutorials/Using KXmlGuiWindow: Difference between revisions

    From KDE TechBase
    (→‎main.cpp: updated aboutData)
    m (→‎main.cpp: Line numbers correction)
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    }
    }
    </code>
    </code>
    The only new lines here (compared to Tutorial 1) are 16 and 17. On line 16, we create our MainWindow object and then on line 17, we display it.
    The only new lines here (compared to Tutorial 1) are 18 and 19. On line 18, we create our MainWindow object and then on line 19, we display it.


    ==CMake==
    ==CMake==

    Revision as of 13:20, 31 July 2007

    How To Use KMainWindow
    Tutorial Series   Beginner Tutorial
    Previous   Tutorial 1 - Hello World
    What's Next   Tutorial 3 - KActions and XmlGui
    Further Reading   KMainWindow

    Abstract

    This tutorial carries on from First Program Tutorial and will introduce the KXmlGuiWindow class.

    In the previous tutorial, the program caused a dialog box to pop up but we're going to take steps towards a functioning application.

    Using KXmlGuiWindow

    In order to have a useful KXmlGuiWindow, we must subclass it. So we create two files, a mainwindow.cpp and a mainwindow.h which will contain our code. Our class inherits from KXmlGuiWindow because it uses XML e.g. to define the application's menu structure.

    mainwindow.h

    1. ifndef MAINWINDOW_H
    2. define MAINWINDOW_H
    1. include <KXmlGuiWindow>
    2. include <KTextEdit>

    class MainWindow : public KXmlGuiWindow {

     public:
       MainWindow(QWidget *parent=0);
    
     private:
       KTextEdit* textArea;
    

    };

    1. endif

    First we Subclass KXmlGuiWindow on line 7 with with class MainWindow : public KXmlGuiWindow.

    Then we declare the constructor with MainWindow(QWidget *parent=0);.

    And finally we declare a pointer to the object that will make up the bulk of our program. KTextEdit is a generic richtext editor with some KDE niceties like cursor auto-hiding.

    mainwindow.cpp

    1. include "mainwindow.h"

    MainWindow::MainWindow(QWidget *parent) : KXmlGuiWindow(parent) {

     textArea = new KTextEdit;
     setCentralWidget(textArea);
     setupGUI();
    

    } First, of course, on line 1 we have to include the header file containing the class declaration.

    On line 5, we initialise our text editor with an object. Then on line 6 we use the built-in setCentralWidget() function which tells the KXmlGuiWindow what should appear in the central section of the window.

    Finally, KXmlGuiWindow::setupGUI() is called which does a lot of behind-the-scenes stuff and creates the default menu bars (Settings, Help).

    Back to main.cpp

    In order to actually run this window, we need to add a few lines in main.cpp:

    main.cpp

    1. include <KApplication>
    2. include <KAboutData>
    3. include <KCmdLineArgs>
    1. include "mainwindow.h"

    int main (int argc, char *argv[]) {

     KAboutData aboutData( "tutorial2", 0,
         ki18n("Tutorial 2"), "1.0",
         ki18n("A simple text area"),
         KAboutData::License_GPL,
         ki18n("Copyright (c) 2007 Developer") );
     KCmdLineArgs::init( argc, argv, &aboutData );
     
     KApplication app;
    
     MainWindow* window = new MainWindow();
     window->show();
    
     return app.exec();
    

    } The only new lines here (compared to Tutorial 1) are 18 and 19. On line 18, we create our MainWindow object and then on line 19, we display it.

    CMake

    The best way to build the program is to use CMake. All that's changed since tutorial 1 is that mainwindow.cpp has been added to the sources list and any tutorial1 has become tutorial2.

    CMakeLists.txt

    project (tutorial2)

    find_package(KDE4 REQUIRED) include_directories( ${KDE4_INCLUDES} )

    set(tutorial2_SRCS main.cpp mainwindow.cpp )

    kde4_add_executable(tutorial2 ${tutorial2_SRCS}) target_link_libraries( tutorial2 ${KDE4_KDEUI_LIBS})

    Compile it

    To compile, link and run it, use:

    cmake . && make && ./tutorial2
    

    Moving On

    Now you can move on to using KActions.