Difference between revisions of "Development/Tutorials/Programming Tutorial KDE 4/KDirWatch"

Line 82: Line 82:
 
Finally, KXmlGuiWindow::setupGUI() is called which does a lot of behind-the-scenes stuff and creates the default menu bars (Settings, Help).
 
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===
 
===main.cpp===
 
<code cppqt>
 
<code cppqt>
 
/*
 
/*
 
 
This program reacts on file changes.
 
This program reacts on file changes.
 
 
*/
 
*/
 
  
 
#include "khello.h"
 
#include "khello.h"
Line 114: Line 109:
 
{
 
{
 
     KAboutData about("khello", I18N_NOOP("khello"), version, description,
 
     KAboutData about("khello", I18N_NOOP("khello"), version, description,
                     KAboutData::License_GPL, "(C) %{YEAR} Thorsten Staerk", 0, 0, "thorsten@staerk.de");
+
                     KAboutData::License_GPL, "(C) %{YEAR} Thorsten Staerk", 0, 0, "someone@home.de");
 
     about.addAuthor( "Thorsten Staerk", 0, "[email protected]" );
 
     about.addAuthor( "Thorsten Staerk", 0, "[email protected]" );
 
     KCmdLineArgs::init(argc, argv, &about);
 
     KCmdLineArgs::init(argc, argv, &about);
Line 121: Line 116:
 
     khello *mainWin = 0;
 
     khello *mainWin = 0;
  
     {
+
     KCmdLineArgs *args = KCmdLineArgs::parsedArgs();
        // no session.. just start up normally
+
    kdDebug() << argv[1] << endl;
        KCmdLineArgs *args = KCmdLineArgs::parsedArgs();
+
    mainWin = new khello(argv[1]);
 
+
    mainWin->show();
        /// @todo do something with the command line args here
 
 
 
        kdDebug() << argv[1] << endl;
 
        mainWin = new khello(argv[1]);
 
        mainWin->show();
 
  
        args->clear();
+
    args->clear();
    }
 
  
    // mainWin has WDestructiveClose flag by default, so it will delete itself.
 
 
     return app.exec();
 
     return app.exec();
 
}
 
}

Revision as of 08:11, 19 June 2007

Using KDirWatch

If you want your program to be notified upon file changes, use KDirWatch. Here is an example.

khello.h

  1. ifndef _KHELLO_H_
  2. define _KHELLO_H_
  1. ifdef HAVE_CONFIG_H
  2. include <config.h>
  3. endif
  1. include <kmainwindow.h>
  2. include <kdirwatch.h>

/**

* @short Application Main Window
* @author Thorsten Staerk <[email protected]>
* @version 0.1
*/

class khello : public KMainWindow {

   Q_OBJECT

public:

   KDirWatch dw;
   /**
    * Default Constructor
    */
   khello(char* args);
   /**
    * Default Destructor
    */
   virtual ~khello();

public slots:

   void slotdirty();

};

  1. endif // _KHELLO_H_

This subclasses KMainWindow.

khello.cpp

  1. include "khello.h"
  1. include <qlabel.h>
  1. include <kdebug.h>
  2. include <kmainwindow.h>
  3. include <klocale.h>
  4. include <kmessagebox.h>

khello::khello(char* args)

   : KMainWindow()

{

   kdDebug() << "args = " << args << endl;
   dw.addFile(args);
   kdDebug() << "Watching file " << args << endl;
   connect(&dw, SIGNAL(dirty(const QString & ) ),
          SLOT( slotdirty() ) );

}

khello::~khello() { }

void khello::slotdirty() {

 kdDebug() << "File has changed" << endl;

}

  1. include "khello.moc"

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).

main.cpp

/* This program reacts on file changes.

  • /
  1. include "khello.h"
  2. include <kapplication.h>
  3. include <kaboutdata.h>
  4. include <kcmdlineargs.h>
  5. include <kdebug.h>
  6. include <klocale.h>

static const char description[] =

   I18N_NOOP("A KDE KPart Application");

static const char version[] = "0.1";

static KCmdLineOptions options[] = {

   { "+[URL]", I18N_NOOP( "Document to open" ), 0 },
   KCmdLineLastOption

};

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

   KAboutData about("khello", I18N_NOOP("khello"), version, description,
                    KAboutData::License_GPL, "(C) %{YEAR} Thorsten Staerk", 0, 0, "[email protected]");
   about.addAuthor( "Thorsten Staerk", 0, "[email protected]" );
   KCmdLineArgs::init(argc, argv, &about);
   KCmdLineArgs::addCmdLineOptions( options );
   KApplication app;
   khello *mainWin = 0;
   KCmdLineArgs *args = KCmdLineArgs::parsedArgs();
   kdDebug() << argv[1] << endl;
   mainWin = new khello(argv[1]);
   mainWin->show();
   args->clear();
   return app.exec();

}

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 KIO KDIRWATCH) include_directories( ${KDE4_INCLUDES} ) set(tutorial2_SRCS

       main.cpp
       khello.cpp

) KDE4_AUTOMOC( ${tutorial2_SRCS} ) kde4_add_executable(tutorial2 ${tutorial2_SRCS}) target_link_libraries( tutorial2 ${KDE4_KDEUI_LIBS} ${KDE4_KIO_LIBS})

Kompile it

To compile, link and run it, use:

cmake . && make && ./tutorial2 /var/log/messages

Moving On

Now you can move on to using KActions.


This page was last edited on 19 June 2007, at 08:11. Content is available under Creative Commons License SA 4.0 unless otherwise noted.