tdelibs/kutils/ksettings

/** 

\namespace KSettings

\short A collection of classes to create configuration dialogs that work over
component boundaries

<h2>How to use KSettings::Dialog in your application.</h2>

<hr>
<h3>1. Open the dialog from your app</h3>

All you need to do is instanciate KSettings::Dialog and show() it. I recommend
the following:

create the 'Configure MyApp' StdAction like this:
\code
KStdAction::preferences( this, SLOT( showConfigDialog() ), actionCollection );
\endcode

and the slot looks like this:
\code
if( m_dlg == 0 )
  m_dlg = new KSettings::Dialog( this );
m_dlg->show();
\endcode

Of course you need to have the 'KSettings::Dialog * m_dlg' member var and
initialize it to 0 in the ctor.

If your application uses KParts that don't set 'X-KDE-ParentApp=&lt;the instance
name of your application&gt;' then you need to use the second ctor of
KSettings::Dialog:
\code
m_dlg = new KSettings::Dialog( QStringList::split( ';', "component1;component2" ) );
\endcode

The KSettings::Dialog object will be destructed automatically by the QObject
mechanisms.


<hr>
<h3>2. Create pages for your dialog</h3>

Every page is a KCM. This is what you need for creating a page:

\code
class MyAppConfig : public KCModule
{
  Q_OBJECT
public:
  MyAppConfig( QWidget *parent, const char *name = 0, const QStringList &args =
      QStringList() );
  ~MyAppConfig();

  void load();
  void save();
  void defaults();
}
\endcode

and in the cpp file:

\code
typedef KGenericFactory<MyAppConfig, QWidget> MyAppConfigFactory;
K_EXPORT_COMPONENT_FACTORY( kcm_myappconfig, MyAppConfigFactory(
    "kcm_myappconfig" ) );

MyAppConfig::MyAppConfig( QWidget *parent, const char *, const QStringList &args )
  : KCModule( MyAppConfigFactory::instance(), parent, args )
{
  // create the pages GUI
  load();
}

// implementations for the other methods
\endcode

For the KConfig object you can either use
KGlobal::config() (I don't recommend it) or KSimpleConfig( "myapprc" ).
I added a method to KSettings::Dispatcher that gives you the KConfig
object for every registered instance name: \ref KSettings::Dispatcher::configForInstanceName


<hr>
<h3>3. The .desktop file for the page</h3>

The .desktop file holds all the information for the dialog to find the page and
insert it at the right place (with the right icon, name and comment).

An example file:
\verbatim
[Desktop Entry]
Encoding=UTF-8
Icon=myapp
Type=Service
ServiceTypes=KCModule

X-KDE-ModuleType=Library
X-KDE-Library=myappconfig
X-KDE-FactoryName=MyAppConfigFactory
X-KDE-ParentApp=myapp
X-KDE-ParentComponents=myapp
X-KDE-Weight=10

Name=General
Comment=General configuration of my app
\endverbatim


Some explanation for those keys:
- You just keep 'Encoding', 'Type', 'ServiceTypes' and 'X-KDE-ModuleType' like
  in the example. For very special needs you might add another ServiceType to
  the list...
- Icon is the icon that will be used in the listview/iconview for your page.
- X-KDE-Library is the name of the library where the page is in. The library
  always needs to be prefixed with kcm_ but you don't write the prefix in the
  desktop file. For more docu on this look for the KCModule docu.
- X-KDE-FactoryName is either the name of the Factory you used in the
  KGenericFactory call or the suffix of the create_ function that you created.
  Again for more info look for the KCModule docu.
- X-KDE-ParentApp is the name of the application this config page belongs to. It
  is used by the first two \ref KSettings::Dialog constructors. The Dialog will
  use all modules that set X-KDE-ParentApp to
  KGlobal::instance()->instanceName(). It
  should be pretty easy to find out what name that is: look at the first
  argument to the KAboutData ctor.
- X-KDE-ParentComponents is a list of the components (plugin/KPart/whatever)
  this config page belongs to. Normally there is only one component.
  It is used for two things:
  -# If you use KSettings::Dispatcher the dispatcher will notify all components
     in this list after the save() method of your KCM has been called. The
     components then can reload the configuration and apply the changes the user
     did to the config.
  -# If your component is used by another application (that is not =
     X-KDE-ParentApp) then it may add the name of the component to the ctor of
     KSettings::Dialog and the dialog will automatically include all config
     pages that have the components name in their ParentComponents list.
- X-KDE-Weight sets the order for the modules to be inserted into the dialog.
  The higher the number (heavier) the lower the module will appear in the list.
  (the default value is 100)
- Name is the string that is shown in the listview/iconview right below the
  icon.
- Comment is the string that is shown on top of the config page for a short
  description what you can do on this page.


<hr>
<h3>4. The .setdlg file for hierarchical (TreeList) page layouts</h3>

If your config dialog should show a tree of pages in the config dialog you need
to define that hierarchy with a .setdlg file.

The file should be installed in apps/&lt;appname&gt;/&lt;appname&gt;.setdlg. If third party
plugins need to merge in they will install their file to
apps/&lt;appname&gt;/ksettingsdialog/&lt;pluginname&gt;.setdlg.

A .setdlg file contains one or more blocks like the following:

\verbatim
[id]
Name=
Comment=
Icon=
Weight=
Parent=
\endverbatim

- The group name (id) is the name you use in the .desktop file of the page:
  If your page's .desktop file says "X-KDE-CfgDlgHierarchy=id" then it will be
  inserted as a child of this entry.
- \p Name: The name of the section. It will appear in the listview.
- \p Comment: A description of what the modules in this section are. It will
  appear in the place where the KCMs are placed when the user clicks on the item
  in the listview.
- \p Icon: An icon for the item.
- \p Weight: Defines the position in the listview. See X-KDE-Weight above.
- \p Parent: If this group should be a child of another group write the parent's
  group id here.

<hr>
<h3>5. The Pluginselector</h3>

There are two ways to use the KPluginSelector widget. One is to use the class
directly and the second to use KSettings::PluginPage as baseclass for a config
page that shows the KPluginSelector widget.

I'll cover the second usage here and the calls to addPlugins are just the same
for the first.

To create a plugin page you need the following code:

\code
typedef KGenericFactory<MyAppPluginConfig, QWidget> MyAppPluginConfigFactory;
K_EXPORT_COMPONENT_FACTORY( kcm_myapppluginconfig, MyAppPluginConfigFactory( "kcm_myapppluginconfig" ) );

MyAppPluginConfig( QWidget * parent, const char *, const QStringList & args )
    : PluginPage( MyAppPluginConfigFactory::instance(), parent, args )
{
    pluginSelector()->addPlugins( ... );
    pluginSelector()->addPlugins( ... );
    .
    .
    .
}
\endcode

pluginSelector() returns a pointer to the KPluginSelector widget of the page.
There are three addPlugins methods available, two for adding KParts plugins and
one for the rest.


<hr>
<h3>6. The .desktop files of plugin config pages</h3>

this is the entry for the Makefile.am:

\verbatim
myappconfigpagedir = $(kde_servicesdir)/<appname>
myappconfigpage_DATA = myappconfigpage.desktop
\endverbatim


And this is what the .desktop file looks like:

\verbatim
[Desktop Entry]
Encoding=UTF-8
Type=Service
Icon=<iconname>
ServiceTypes=KPluginInfo

Name=MyPlugin
Comment=My plugin is cool and does foo and bar.

X-KDE-PluginInfo-Name=myplugin

X-KDE-PluginInfo-Author=<your name>
X-KDE-PluginInfo-Email=<your email>
X-KDE-PluginInfo-Website=http://www.myplugin.org/
X-KDE-PluginInfo-Category=CoolPlugins
X-KDE-PluginInfo-Version=0.1
X-KDE-PluginInfo-License=GPL
X-KDE-PluginInfo-EnabledByDefault=true
X-KDE-PluginInfo-Depends=myotherplugin
X-KDE-CfgDlgHierarchy=GroupID
\endverbatim

Explanation:
mandatory entries:
- leave \p Type and \p Encoding like in the example
- \p Name
- \p Comment
- \p X-KDE-PluginInfo-Name is the "internal name" of the plugin.
- You need to have \p KPluginInfo in \p ServiceTypes but of course you may have more
  entries in there.

optional entries:
- \p Icon is the icon used for your plugin (it's shown in the pluginselector if you
  set one).
- \p X-KDE-PluginInfo-Author and \p X-KDE-PluginInfo-Email is some information about the author of the plugin.
- \p X-KDE-PluginInfo-Website is the address for a webpage for this plugin.
- \p X-KDE-PluginInfo-Category is used if your application has different categories of plugins.
- \p X-KDE-PluginInfo-Version is the version of this plugin.
- \p X-KDE-PluginInfo-License is the license of this plugin.
- \p X-KDE-PluginInfo-EnabledByDefault tells the program whether the plugin
  should be enabled on first startup or not.
- \p X-KDE-PluginInfo-Depends can be used to tell the application that you need to have
  myotherplugin enabled for your plugin to work.
- \p X-KDE-CfgDlgHierarchy is used if you use a \p KSettings::Dialog::ConfigurableInline
  KSettings::Dialog to put the plugin checkbox into the group with the GroupID
  you set here.

If you have questions contact Matthias Kretz <kretz@kde.org>.
*/
// vim: tw=80