Difference between revisions of "Development/Tutorials/Using KXmlGuiWindow"

(Second introductory tutorial for beginner KDE programmers)
(Replaced content with "This page was moved [https://develop.kde.org/docs/getting-started/main_window/ here]")
Tag: Replaced
(90 intermediate revisions by 24 users not shown)
Line 1: Line 1:
This page was moved [https://develop.kde.org/docs/getting-started/main_window/ here]
This tutorial carries on from [[Development/Tutorials/Programming_Tutorial_KDE_4/First_program|First Program Tutorial]] and will introduce the {{class|KMainWindow}} class.
In the previous tutorial, the program caused a dialog box to pop up but were going to take steps towards a functioning application.
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.
==MainWindow Class==
<code cppqt n>
#include <KMainWindow>
#include <KTextEdit>
class MainWindow : public KMainWindow
    MainWindow(QWidget *parent=0);
    KTextEdit* textArea;
First we Subclass KMainWindow on line 7 with with <tt>class MainWindow : public KMainWindow</tt>.
The we declare the constructor with <tt>MainWindow(QWidget *parent=0);</tt>.
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.
<code cppqt n>
#include "mainwindow.h"
MainWindow::MainWindow(QWidget *parent) : KMainWindow(parent)
  textArea = new KTextEdit;
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 KMainWindow what should appear in the central section of the window.
Finally, KMainWindow::setupGUI() is called which does a lot of behind the scene's 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:
<code cppqt n>
#include <KApplication>
#include <KAboutData>
#include <KCmdLineArgs>
#include "mainwindow.h"
int main (int argc, char *argv[])
  KAboutData aboutData( "tutorial2",
      "Tutorial2", "1.0", "A simple text area",
      KAboutData::License_GPL, "(c) 2006" );
  KCmdLineArgs::init( argc, argv, &aboutData );
  KApplication app;
  MainWindow* window = new MainWindow();
  return app.exec();
The only new lines here (compared to Tutorial 1) are 14 and 15. On line 14, we create our MainWindow object and then on line 15, we display it.
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.
<code ini n>
project (tutorial2)
find_package(KDE4 REQUIRED)
include_directories( ${KDE4_INCLUDES} )
kde4_add_executable(tutorial2 ${tutorial2_SRCS})
target_link_libraries( tutorial2 ${KDE4_KDEUI_LIBS})

Latest revision as of 14:32, 8 September 2020

This page was moved here

This page was last edited on 8 September 2020, at 14:32. Content is available under Creative Commons License SA 4.0 unless otherwise noted.