Development/Tutorials/Using KParts: Difference between revisions

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{{Template:I18n/Language Navigation Bar|Development/Tutorials/Using_KParts}}
{{TutorialBrowser|
{{TutorialBrowser|


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reading=[http://api.kde.org/4.x-api/kdelibs-apidocs/kparts/html/index.html KParts Documentation]
reading=[http://api.kde.org/4.x-api/kdelibs-apidocs/kparts/html/index.html KParts Documentation]
}}
}}
{{Review|Port to KF5}}
Port to KF5 is WIP


== Introduction ==
== Introduction ==
Line 18: Line 20:


This tutorial will show you how to use a KPart in your application, and how to create your own KPart.
This tutorial will show you how to use a KPart in your application, and how to create your own KPart.
KParts consist of a .desktop file describing the KPart and a .so file containing the function names and code. The .desktop file resides in KDE's services directory, you can find it out like this:
#kf5-config --path services
/home/username/.local/share/kservices5/:/usr/share/kservices5/
The first kPart we describe is KatePart, an editor representing a typical [http://api.kde.org/4.0-api/kdelibs-apidocs/kparts/html/classKParts_1_1ReadWritePart.html ReadWritePart]. A typical [http://api.kde.org/4.0-api/kdelibs-apidocs/kparts/html/classKParts_1_1ReadOnlyPart.html ReadOnlyPart] would be [http://api.kde.org/4.5-api/kdebase-apps-apidocs/konsole/html/classKonsole_1_1Part.html konsolePart].


== Using Katepart ==
== Using Katepart ==
Line 27: Line 35:
=== main.cpp ===
=== main.cpp ===


<code cppqt>
<syntaxhighlight lang="cpp-qt">
#include <KApplication>
 
#include <QApplication>
#include <QUrl>
#include <QCommandLineParser>
 
#include <KAboutData>
#include <KAboutData>
#include <KCmdLineArgs>
#include <KCrash>
#include <KUrl>
#include <KLocalizedString>
 
   
   
#include "mainwindow.h"
#include "mainwindow.h"
Line 37: Line 50:
int main (int argc, char *argv[])
int main (int argc, char *argv[])
{
{
     KAboutData aboutData( "kparttutorial1", "kparttutorial1",
    QApplication application(argc, argv);
         ki18n("KPart Tutorial 1"), "0.1",
 
         ki18n("A MainWindow for a KatePart."),
    KLocalizedString::setApplicationDomain("amazeing");
         KAboutData::License_GPL,
    KCrash::initialize();
         ki18n("Copyright (c) 2007 Developer") );
 
    KCmdLineArgs::init( argc, argv, &aboutData );
     KAboutData aboutData( QStringLiteral("kparttut1"),
         i18n("KPart Tutorial 1"),
    KCmdLineOptions options;
        QStringLiteral("0.1"),
    options.add("+[file]", ki18n("Document to open"));
         i18n("A MainWindow for a KatePart."),
    KCmdLineArgs::addCmdLineOptions(options);
         KAboutLicense::GPL,
         i18n("Copyright (c) 2019 Developer") );
    KApplication app;
   
   
    QCommandLineParser parser;
    aboutData.setupCommandLine(&parser);
    parser.process(application);
    aboutData.processCommandLine(&parser);
    const QStringList args = parser.positionalArguments();
     MainWindow* window = new MainWindow();
     MainWindow* window = new MainWindow();
     window->show();
     window->show();


    KCmdLineArgs *args = KCmdLineArgs::parsedArgs();
     if(!args.isEmpty())
     if(args->count())
     {
     {
         window->load(args->url(0).url());
         window->load(QUrl(args.first()));
     }
     }


Line 62: Line 81:
}
}


</code>
</syntaxhighlight>


The main.cpp file is the same as that used in [[Development/Tutorials/KCmdLineArgs|Tutorial 5 - Command line arguments]].The only difference is in the details of the KAboutData.
The main.cpp file is the same as that used in [[Development/Tutorials/KCmdLineArgs|Tutorial 5 - Command line arguments]]. The only difference is in the details of the KAboutData.


=== mainwindow.h ===
=== mainwindow.h ===


<code cppqt>
<syntaxhighlight lang="cpp-qt">


#ifndef KPARTTUTORIAL1_H         
#ifndef KPARTTUTORIAL1_H         
#define KPARTTUTORIAL1_H         
#define KPARTTUTORIAL1_H         
                                  
                                  
#include <kparts/mainwindow.h>
#include <KParts/MainWindow>
#include <QUrl>  
                                  
                                  
/**                             
/**                             
Line 95: Line 115:
     * Default Destructor
     * Default Destructor
     */
     */
     virtual ~MainWindow();
     ~MainWindow() override = default;


public slots:
     /**
     /**
     * Use this method to load whatever file/URL you have
     * Use this method to load whatever file/URL you have
     */
     */
     void load(const KUrl& url);
     void load(const QUrl& url);


     /**
     /**
Line 117: Line 138:
#endif // KPARTTUT1_H
#endif // KPARTTUT1_H


</code>
</syntaxhighlight>


The mainwindow.h file is very simple. The important thing to notice here is that the MainWindow class inherits from KParts::MainWindow.
The mainwindow.h file is very simple. The important thing to notice here is that the MainWindow class inherits from KParts::MainWindow.
Line 123: Line 144:
=== mainwindow.cpp ===
=== mainwindow.cpp ===


<code cppqt>
<syntaxhighlight lang="cpp-qt">


#include "mainwindow.h"
#include "mainwindow.h"


#include <kaction.h>
#include <KActionCollection>
#include <kactioncollection.h>
#include <KConfig>
#include <kconfig.h>
#include <KEditToolBar>
#include <kedittoolbar.h>
#include <KShortcutsDialog>
#include <kfiledialog.h>
#include <KMessageBox>
#include <kshortcutsdialog.h>
#include <KService>
#include <klibloader.h>
#include <KStandardAction>
#include <kmessagebox.h>
#include <KParts/ReadWritePart>
#include <kstandardaction.h>
#include <kstatusbar.h>
#include <kurl.h>


#include <QApplication>
#include <QApplication>
#include <QFileDialog>
#include <QStatusBar>


MainWindow::MainWindow()
MainWindow::MainWindow()
Line 148: Line 168:
     setupActions();
     setupActions();


     // this routine will find and load our Part
     //query the .desktop file to load the requested Part
     KLibFactory *factory = KLibLoader::self()->factory("katepart");
     KService::Ptr service = KService::serviceByDesktopName
     if (factory)
                          ("katepart");
    {
 
        // now that the Part is loaded, we cast it to a Part to get
     if (service) {
        // our hands on it
         m_part = service->createInstance<KParts::ReadWritePart>(0);
         m_part = static_cast<KParts::ReadWritePart *>
                (factory->create(this, "KatePart" ));


         if (m_part)
         if (m_part) {
        {
             // tell the KParts::MainWindow that this is indeed
             // tell the KParts::MainWindow that this is indeed
             // the main widget
             // the main widget
Line 167: Line 184:
             // and integrate the part's GUI with the shell's
             // and integrate the part's GUI with the shell's
             createGUI(m_part);
             createGUI(m_part);
        } else{
            return;//return 1;
         }
         }
     }
     } else {
    else
    {
         // if we couldn't find our Part, we exit since the Shell by
         // if we couldn't find our Part, we exit since the Shell by
         // itself can't do anything useful
         // itself can't do anything useful
         KMessageBox::error(this, "Could not find our Part!");
         KMessageBox::error(this, "service katepart not found");
         qApp->quit();
         qApp->quit();
         // we return here, cause qApp->quit() only means "exit the
         // we return here, cause qApp->quit() only means "exit the
Line 181: Line 198:
}
}


MainWindow::~MainWindow()
void MainWindow::load(const QUrl& url)
{
}
 
void MainWindow::load(const KUrl& url)
{
{
     m_part->openUrl( url );
     m_part->openUrl(url);
}
}


void MainWindow::setupActions()
void MainWindow::setupActions()
{
{
     KStandardAction::open(this, SLOT(fileOpen()),  
     KStandardAction::open(this, QOverload<>::of(&MainWindow::load),  
         actionCollection());
         actionCollection());
     KStandardAction::quit(qApp, SLOT(closeAllWindows()),
     KStandardAction::quit(qApp, &QApplication::closeAllWindows,
         actionCollection());
         actionCollection());
}
}
Line 200: Line 213:
void MainWindow::load()
void MainWindow::load()
{
{
     load(KFileDialog::getOpenUrl());
     load(QFileDialog::getOpenFileUrl());
}
}


</code>
</syntaxhighlight>


The mainwindow.cpp file contains the implementation of MainWindow. The constructor of this class contains all the code used to load the KPart.
The mainwindow.cpp file contains the implementation of MainWindow. The constructor of this class contains all the code used to load the KPart.
Line 211: Line 224:
=== kparttut1ui.rc ===
=== kparttut1ui.rc ===


<code xml>
<syntaxhighlight lang="xml">
<!DOCTYPE kpartgui SYSTEM "kpartgui.dtd">
<!DOCTYPE kpartgui SYSTEM "kpartgui.dtd">
<kpartgui name="kparttut1" version="1">
<kpartgui name="kparttut1" version="1">
Line 230: Line 243:
</ToolBar>
</ToolBar>
</kpartgui>
</kpartgui>
</code>
</syntaxhighlight>


The kparttut1ui.rc file is used to define how the actions in the part and the actions in the main window will be merged together. The <tt><Merge /></tt> element in the file menu for example indicates that any part containing actions in a file menu should list its parts after the file_open action and before the file_quit action.
The kparttut1ui.rc file is used to define how the actions in the part and the actions in the main window will be merged together. The <tt><Merge /></tt> element in the file menu for example indicates that any part containing actions in a file menu should list its parts after the file_open action and before the file_quit action.
Line 236: Line 249:
=== CMakeLists.txt ===
=== CMakeLists.txt ===


<code ini>
<syntaxhighlight lang="cmake">
 
cmake_minimum_required(VERSION 3.16)


project(kparttut1)
project(kparttut1)


FIND_PACKAGE(KDE4 REQUIRED)
set(QT_MIN_VERSION "5.15.0")
INCLUDE_DIRECTORIES( ${KDE4_INCLUDES} . )
set(KF_MIN_VERSION "5.82.0")
 
find_package(ECM ${KF_MIN_VERSION} REQUIRED NO_MODULE)
set(CMAKE_MODULE_PATH ${ECM_MODULE_PATH})
 
include(KDEInstallDirs)
include(KDECMakeSettings)
include(KDECompilerSettings NO_POLICY_SCOPE)
include(ECMInstallIcons)
include(FeatureSummary)
 
find_package(Qt5 ${QT_MIN_VERSION} CONFIG REQUIRED COMPONENTS Core Gui Widgets)
 
find_package(KF5 ${KF_MIN_VERSION} REQUIRED COMPONENTS
    CoreAddons
    Crash
    DBusAddons
    DocTools
    I18n
    XmlGui
    TextEditor
    Parts
)


set(kparttut1_SRCS
set(kparttut1_SRCS
   main.cpp
   main.cpp
   mainwindow.cpp
   mainwindow.cpp
)
)


kde4_add_executable(kparttut1 ${kparttut1_SRCS})
add_executable(kparttut1 ${kparttut1_SRCS})


target_link_libraries(kparttut1 ${KDE4_KDEUI_LIBS} ${KDE4_KPARTS_LIBS})
target_link_libraries(kparttut1 PUBLIC
    Qt5::Widgets
    KF5::CoreAddons
    KF5::Crash
    KF5::DBusAddons
    KF5::DocTools
    KF5::I18n
    KF5::XmlGui
    KF5::TextEditor
    KF5::Parts
)


########### install files ###############
########### install files ###############
install(TARGETS kparttut1 DESTINATION ${BIN_INSTALL_DIR} )
 
install( FILES kparttut1ui.rc  
install(TARGETS kparttut1 ${KDE_INSTALL_TARGETS_DEFAULT_ARGS})
     DESTINATION  ${DATA_INSTALL_DIR}/kparttut1 )
 
</code>
install(FILES kparttut1ui.rc  
     DESTINATION  ${KDE_INSTALL_KXMLGUI5DIR}/kparttut)
 
feature_summary(WHAT ALL INCLUDE_QUIET_PACKAGES FATAL_ON_MISSING_REQUIRED_PACKAGES)
 
</syntaxhighlight>
The CMakeLists.txt file is very simple in this case.
The CMakeLists.txt file is very simple in this case.


Line 262: Line 314:


After compiling, linking and installing the application with
After compiling, linking and installing the application with
  cmake . && make -j4 && make install
  mkdir build && cd build && cmake .. && make -j4 && make install
it can be executed with  
it can be executed with  
  kparttut1 filename
  kparttut1 ''filename''
where filename is a text file to load. One of the source files would be a good example.
where ''filename'' is a text file to load. One of the source files would be a good example.


When the file loads you will have a full-featured kate editor running in its own window. All of the editor features of kate are available in the toolbars and menu.
When the file loads you will have a full-featured kate editor running in its own window. All of the editor features of kate are available in the toolbars and menu.
Line 271: Line 323:
You will notice that the 'Open' action you defined in the MainWindow class has also appeared in the toolbar and in the menu along with the 'Quit' action.
You will notice that the 'Open' action you defined in the MainWindow class has also appeared in the toolbar and in the menu along with the 'Quit' action.


The next tutorial will deal with creating your own kparts for use (and reuse) in other applications.
The next tutorial will deal with creating your own KParts for use (and reuse) in other applications.

Latest revision as of 21:12, 12 August 2021

How To Use KParts
Tutorial Series   Plugins and KParts
Previous   Tutorial 5 - Command line arguments
What's Next   n/a
Further Reading   KParts Documentation
Warning
This page needs a review and probably holds information that needs to be fixed.

Parts to be reviewed:

Port to KF5

Port to KF5 is WIP

Introduction

KPart technology is used in kde to reuse GUI components. The advantage that a KPart presents is that it comes with predefined toolbar actions. By using kparts in applications developers can spend less time implementing text editor or command line features, for example and just use a katepart or a konsolepart instead. KParts are also used with Plugin technology to embed applications inside another, such as integrating PIM applications into Kontact.

This tutorial will show you how to use a KPart in your application, and how to create your own KPart.

KParts consist of a .desktop file describing the KPart and a .so file containing the function names and code. The .desktop file resides in KDE's services directory, you can find it out like this:

#kf5-config --path services
/home/username/.local/share/kservices5/:/usr/share/kservices5/

The first kPart we describe is KatePart, an editor representing a typical ReadWritePart. A typical ReadOnlyPart would be konsolePart.

Using Katepart

Simple KDE applications use a MainWindow derived from KMainWindow (such as in previous tutorials). To use a KPart in an application, the MainWindow must instead be derived from KParts::MainWindow. This will then take care of integrating the toolbar and menu items of the kpart together.

The following code creates a KParts::MainWindow with a kpart inside it.

main.cpp

#include <QApplication>
#include <QUrl>
#include <QCommandLineParser>

#include <KAboutData>
#include <KCrash>
#include <KLocalizedString>

 
#include "mainwindow.h"
 
int main (int argc, char *argv[])
{
    QApplication application(argc, argv);

    KLocalizedString::setApplicationDomain("amazeing");
    KCrash::initialize();

    KAboutData aboutData( QStringLiteral("kparttut1"),
        i18n("KPart Tutorial 1"),
        QStringLiteral("0.1"),
        i18n("A MainWindow for a KatePart."),
        KAboutLicense::GPL,
        i18n("Copyright (c) 2019 Developer") );
 
    QCommandLineParser parser;
    aboutData.setupCommandLine(&parser);

    parser.process(application);
    aboutData.processCommandLine(&parser);

    const QStringList args = parser.positionalArguments();

    MainWindow* window = new MainWindow();
    window->show();

    if(!args.isEmpty())
    {
        window->load(QUrl(args.first()));
    }

    return app.exec();
}

The main.cpp file is the same as that used in Tutorial 5 - Command line arguments. The only difference is in the details of the KAboutData.

mainwindow.h

#ifndef KPARTTUTORIAL1_H        
#define KPARTTUTORIAL1_H        
                                
#include <KParts/MainWindow> 
#include <QUrl> 
                                
/**                             
 * This is the application "Shell".  It has a menubar, toolbar, and
 * statusbar but relies on the "Part" to do all the real work.     
 *                                                                 
 * @short Application Shell                                        
 * @author Developer <[email protected]>                           
 * @version 0.1
 */
class MainWindow : public KParts::MainWindow
{
    Q_OBJECT
public:
    /**
     * Default Constructor
     */
    MainWindow();

    /**
     * Default Destructor
     */
    ~MainWindow() override = default;

public slots:
    /**
     * Use this method to load whatever file/URL you have
     */
    void load(const QUrl& url);

    /**
     * Use this method to display an openUrl dialog and
     * load the URL that gets entered
     */
    void load();

private:
    void setupActions();

private:
    KParts::ReadWritePart *m_part;
};

#endif // KPARTTUT1_H

The mainwindow.h file is very simple. The important thing to notice here is that the MainWindow class inherits from KParts::MainWindow.

mainwindow.cpp

#include "mainwindow.h"

#include <KActionCollection>
#include <KConfig>
#include <KEditToolBar>
#include <KShortcutsDialog>
#include <KMessageBox>
#include <KService>
#include <KStandardAction>
#include <KParts/ReadWritePart>

#include <QApplication>
#include <QFileDialog>
#include <QStatusBar>

MainWindow::MainWindow()
    : KParts::MainWindow( )
{

    // Setup our actions
    setupActions();

    //query the .desktop file to load the requested Part
    KService::Ptr service = KService::serviceByDesktopName
                           ("katepart");

    if (service) {
        m_part = service->createInstance<KParts::ReadWritePart>(0);

        if (m_part) {
            // tell the KParts::MainWindow that this is indeed
            // the main widget
            setCentralWidget(m_part->widget());

            setupGUI(ToolBar | Keys | StatusBar | Save);

            // and integrate the part's GUI with the shell's
            createGUI(m_part);
        } else{
            return;//return 1; 
        }
    } else {
        // if we couldn't find our Part, we exit since the Shell by
        // itself can't do anything useful
        KMessageBox::error(this, "service katepart not found");
        qApp->quit();
        // we return here, cause qApp->quit() only means "exit the
        // next time we enter the event loop...
        return;
    }
}

void MainWindow::load(const QUrl& url)
{
    m_part->openUrl(url);
}

void MainWindow::setupActions()
{
    KStandardAction::open(this, QOverload<>::of(&MainWindow::load), 
        actionCollection());
    KStandardAction::quit(qApp, &QApplication::closeAllWindows,
        actionCollection());
}

void MainWindow::load()
{
    load(QFileDialog::getOpenFileUrl());
}

The mainwindow.cpp file contains the implementation of MainWindow. The constructor of this class contains all the code used to load the KPart.

First it sets up the actions used by the main window (Open and Quit), and then sets up the gui elements to go with these items (toolbar items, menu items, keyboard shortcuts). Next is the standard code used to load the KPart. The createGUI method is responsible for merging the toolbars and menus of the KPart with the rest of the application.

kparttut1ui.rc

<!DOCTYPE kpartgui SYSTEM "kpartgui.dtd">
<kpartgui name="kparttut1" version="1">
<MenuBar>
  <Menu noMerge="1" name="file"><text>&amp;File</text>
    <Action name="file_open"/>
    <Separator/>
    <Merge/>
    <Separator/>
    <Action name="file_quit"/>
  </Menu>

  <Merge />
</MenuBar>
<ToolBar noMerge="1" name="mainToolBar"><text>Main Toolbar</text>
  <Action name="file_open"/>
  <Merge/>
</ToolBar>
</kpartgui>

The kparttut1ui.rc file is used to define how the actions in the part and the actions in the main window will be merged together. The <Merge /> element in the file menu for example indicates that any part containing actions in a file menu should list its parts after the file_open action and before the file_quit action.

CMakeLists.txt

cmake_minimum_required(VERSION 3.16)

project(kparttut1)

set(QT_MIN_VERSION "5.15.0")
set(KF_MIN_VERSION "5.82.0")

find_package(ECM ${KF_MIN_VERSION} REQUIRED NO_MODULE)
set(CMAKE_MODULE_PATH ${ECM_MODULE_PATH})

include(KDEInstallDirs)
include(KDECMakeSettings)
include(KDECompilerSettings NO_POLICY_SCOPE)
include(ECMInstallIcons)
include(FeatureSummary)

find_package(Qt5 ${QT_MIN_VERSION} CONFIG REQUIRED COMPONENTS Core Gui Widgets)

find_package(KF5 ${KF_MIN_VERSION} REQUIRED COMPONENTS
    CoreAddons
    Crash
    DBusAddons
    DocTools
    I18n
    XmlGui
    TextEditor
    Parts
)

set(kparttut1_SRCS
   main.cpp
   mainwindow.cpp
)

add_executable(kparttut1 ${kparttut1_SRCS})

target_link_libraries(kparttut1 PUBLIC
    Qt5::Widgets
    KF5::CoreAddons
    KF5::Crash
    KF5::DBusAddons
    KF5::DocTools
    KF5::I18n
    KF5::XmlGui
    KF5::TextEditor
    KF5::Parts
)

########### install files ###############

install(TARGETS kparttut1 ${KDE_INSTALL_TARGETS_DEFAULT_ARGS})

install(FILES kparttut1ui.rc 
    DESTINATION  ${KDE_INSTALL_KXMLGUI5DIR}/kparttut)

feature_summary(WHAT ALL INCLUDE_QUIET_PACKAGES FATAL_ON_MISSING_REQUIRED_PACKAGES)

The CMakeLists.txt file is very simple in this case.

Running the Application

After compiling, linking and installing the application with

mkdir build && cd build && cmake .. && make -j4 && make install

it can be executed with

kparttut1 filename

where filename is a text file to load. One of the source files would be a good example.

When the file loads you will have a full-featured kate editor running in its own window. All of the editor features of kate are available in the toolbars and menu.

You will notice that the 'Open' action you defined in the MainWindow class has also appeared in the toolbar and in the menu along with the 'Quit' action.

The next tutorial will deal with creating your own KParts for use (and reuse) in other applications.