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| [[image:introtokdetutorial2.png|frame|center]] | | This page was moved [https://develop.kde.org/docs/getting-started/main_window/ here] |
| ==Abstract==
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| This tutorial carries on from [[Development/Tutorials/Programming_Tutorial_KDE_4/First_program|First Program Tutorial]] and will introduce the {{class|KMainWindow}} class.
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| In the previous tutorial, the program caused a dialog box to pop up but were going to take steps towards a functioning application.
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| In order to have a useful KMainWindow, we must sub class it. So we create two files, a <tt>MainWindow.cpp</tt> and a <tt>MainWindow.h</tt> which will contain our code.
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| ==Prerequisites==
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| * [[Development/Tutorials/Programming_Tutorial_KDE_4/First_program|Hello World Tutorial]]
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| ==MainWindow Class==
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| ===MainWindow.h===
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| <code cppqt n>
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| #ifndef MAINWINDOW_H
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| #define MAINWINDOW_H
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| #include <KMainWindow>
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| #include <KTextEdit>
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| class MainWindow : public KMainWindow
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| {
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| public:
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| MainWindow(QWidget *parent=0);
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|
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| private:
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| KTextEdit* textArea;
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| };
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| #endif
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| </code>
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| First we Subclass KMainWindow on line 7 with with <tt>class MainWindow : public KMainWindow</tt>.
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| The we declare the constructor with <tt>MainWindow(QWidget *parent=0);</tt>.
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| And finally we declare a ponter to the object that will make up the bulk of our program. {{class|KTextEdit}} is a generic richtext editor with some KDE niceties like cursor auto-hiding.
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| ===MainWindow.cpp===
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| <code cppqt n>
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| #include "mainwindow.h"
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| MainWindow::MainWindow(QWidget *parent) : KMainWindow(parent)
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| {
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| textArea = new KTextEdit;
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| setCentralWidget(textArea);
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| setupGUI();
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| }
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| </code>
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| First, of course, on line 1 we have to include the header file containing the class declaration.
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| 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 KMainWindow what should appear in the central section of the window.
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| Finally, KMainWindow::setupGUI() is called which does a lot of behind the scene's stuff and creates the default menu bars (Settings, Help).
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| ==Back to main.cpp==
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| In order to actually run this window, we need to add a few lines in main.cpp:
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| ===main.cpp===
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| <code cppqt n>
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| #include <KApplication>
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| #include <KAboutData>
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| #include <KCmdLineArgs>
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| #include "mainwindow.h"
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| int main (int argc, char *argv[])
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| {
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| KAboutData aboutData( "tutorial2",
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| "Tutorial2", "1.0", "A simple text area",
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| KAboutData::License_GPL, "(c) 2006" );
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| KCmdLineArgs::init( argc, argv, &aboutData );
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|
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| KApplication app;
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|
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| MainWindow* window = new MainWindow();
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| window->show();
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| return app.exec();
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| }
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| </code>
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| 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.
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| ==CMake==
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| The best way to build the program is to use CMake. All that's changed since tutorial 1 is <tt>mainwindow.cpp</tt> has been added to the sources list.
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| <code ini n>
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| project (tutorial2)
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| find_package(KDE4 REQUIRED)
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| include_directories( ${KDE4_INCLUDES} )
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| set(tutorial2_SRCS
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| main.cpp
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| mainwindow.cpp
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| )
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| kde4_add_executable(tutorial2 ${tutorial2_SRCS})
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| target_link_libraries( tutorial2 ${KDE4_KDEUI_LIBS})
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| </code>
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| ==Moving On==
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| Now you can move on to [[Development/Tutorials/Programming_Tutorial_KDE_4/Using_KActions|using KActions]].
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