VolumeBarLogic Class Reference

Provides informations and actions on PulseAudio MainVolume API. More...

#include <volumebarlogic.h>

Inheritance diagram for VolumeBarLogic:

Collaboration diagram for VolumeBarLogic:

List of all members.

Public Slots
void	setVolume (quint32 value)
void	stepsUpdated (quint32 value, quint32 maxvalue)
Signals
void	volumeChanged (quint32 value, quint32 maxvalue)
Public Member Functions
	VolumeBarLogic ()
	Construct a VolumeBarLogic instance.
	~VolumeBarLogic ()
	Destructs a VolumeBarLogic instance.
quint32	volume ()
	get the current volume-level value
quint32	maxVolume ()
	get the current volume-level stepcount

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Detailed Description

Provides informations and actions on PulseAudio MainVolume API.

Definition at line 28 of file volumebarlogic.h.

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Constructor & Destructor Documentation

VolumeBarLogic::VolumeBarLogic

(

)

Construct a VolumeBarLogic instance.

Definition at line 42 of file volumebarlogic.cpp.

                                :
    QObject (),
    dbus_conn (NULL),
    currentvolume (0),
    currentmax (0)
{
    openConnection (true);
}

VolumeBarLogic::~VolumeBarLogic

(

)

Destructs a VolumeBarLogic instance.

Definition at line 51 of file volumebarlogic.cpp.

{
    if (dbus_conn) {
        dbus_connection_unref (dbus_conn);
        dbus_conn = 0;
    }
}

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Member Function Documentation

quint32 VolumeBarLogic::maxVolume

(

)

get the current volume-level stepcount

Definition at line 281 of file volumebarlogic.cpp.

{
    ping ();

    return currentmax;
}

void VolumeBarLogic::setVolume

(

quint32

value

)

[slot]

a method for change the volume-level

Parameters:

value

The desired volume-level (valid range: [0 - maxvalue-1])

Definition at line 224 of file volumebarlogic.cpp.

{
    currentvolume = value;

    // Check the connection, maybe PulseAudio restarted meanwhile
    openConnection ();

    // Don't try to set the volume via d-bus when it isn't available
    if (dbus_conn == NULL)
        return;

    DBusMessage     *message;
    char            *volume_if = (char *) VOLUME_IF;
    char            *method    = (char *) "CurrentStep";

    message = dbus_message_new_method_call (VOLUME_SV,
                                            VOLUME_PATH,
                                            "org.freedesktop.DBus.Properties",
                                            "Set");

    if (message &&
        dbus_message_append_args (message,
                                  DBUS_TYPE_STRING, &volume_if,
                                  DBUS_TYPE_STRING, &method,
                                  DBUS_TYPE_INVALID)) {
        DBusMessageIter  append;
        DBusMessageIter  sub;

        // Create and append the variant argument ...
        dbus_message_iter_init_append (message, &append);

        dbus_message_iter_open_container (&append,
                                          DBUS_TYPE_VARIANT,
                                          DBUS_TYPE_UINT32_AS_STRING,
                                          &sub);
        // Set the variant argument value:
        dbus_message_iter_append_basic (&sub, DBUS_TYPE_UINT32, &value);
        // Close the append iterator
        dbus_message_iter_close_container (&append, &sub);

        // Send/flush the message immediately:
        dbus_connection_send (dbus_conn, message, NULL);
    } else {
        qWarning() << "Cannot set volume! [not enough memory]";
    }

    if (message)
        dbus_message_unref (message);
}

void VolumeBarLogic::stepsUpdated	(	quint32	value,
		quint32	maxvalue
	)			[slot]

an internal slot whats stores the actual volume values and emits the volumeChanged signal [this is public because it called from a C callback function...]

Parameters:

	value	The new volume-level what we got from PulseAudio
	maxvalue	The new stepcount what we got from PulseAudio

Definition at line 216 of file volumebarlogic.cpp.

{
    currentvolume = value;
    currentmax = maxvalue;

    emit volumeChanged (value, maxvalue);
}

Here is the call graph for this function:

quint32 VolumeBarLogic::volume

(

)

get the current volume-level value

Definition at line 274 of file volumebarlogic.cpp.

{
    ping ();

    return currentvolume;
}

void VolumeBarLogic::volumeChanged	(	quint32	value,
		quint32	maxvalue
	)			[signal]

a signal what is emitted whenever the volume-level and/or the volume-level step-counts are updated

Parameters:

	value	The new volume-level
	maxvalue	The new volume-level stepcount value

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The documentation for this class was generated from the following files:

• src/systemui/volumecontrol/volumebarlogic.h (795ad6db04802c20772a802e43a88ba463bc79de)
• src/systemui/volumecontrol/volumebarlogic.cpp (3233099052a5201e0983e3c967fd3b0efd29f602)