Development/Tutorials/Using KXmlGuiWindow (pt BR)

Development/Tutorials/Using_KXmlGuiWindow

Como usar o KXmlGuiWindow

Tutorial Series	Beginner Tutorial
Previous	Tutorial 1 - Hello World
What's Next	Tutorial 3 - KActions e XMLGUI
Further Reading	KXmlGuiWindow

Resumo

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

No tutorial anterior, o programa criava uma caixa de diálogo pop up, mas nós agora iremos andar alguns passos em direção ao funcionamento de uma aplicação.

KXmlGuiWindow

KXmlGuiWindow fornece a visão de uma janela principal inteira com barra de menus, barra de ferramentas, uma barra de status e uma área no centro para um widget grande. Muitas aplicações KDE derivam desta classe já que ela fornece um jeito fácil de definir o layout do menu e barra de ferramentas através de arquivos XML (esta tecnologia é chamada de XMLGUI). Por enquanto não usaremos o XMLGUI neste tutorial, mas nós o usaremos no próximo.

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.

mainwindow.h

ifndef MAINWINDOW_H
define MAINWINDOW_H

include <KXmlGuiWindow>
include <KTextEdit>

class MainWindow : public KXmlGuiWindow
{

 public:
   MainWindow(QWidget *parent=0);

 private:
   KTextEdit* textArea;

};

endif

First we Subclass KXmlGuiWindow on line 7 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

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 KXmlGuiWindow's 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

include <KApplication>
include <KAboutData>
include <KCmdLineArgs>

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 5, 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:

mkdir build && cd build
cmake ..
make
./tutorial2

Moving On

Now you can move on to using KActions.