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plasma: setup events callback for mixer applet

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to update sliders when the volume is changed by means other than changing
the slider values (e.g. via `alsamixer`)

Signed-off-by: Ivailo Monev <xakepa10@gmail.com>
This commit is contained in:
Ivailo Monev 2023-09-21 17:11:16 +03:00
parent f259e5654a
commit a7474986b2
1 changed files with 68 additions and 11 deletions
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79
plasma/applets/mixer/mixer.cpp
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@ -38,6 +38,7 @@ static const QSizeF s_minimumslidersize = QSizeF(10, 70);
static const int s_svgiconsize = 256;
static const QString s_defaultpopupicon = QString::fromLatin1("audio-card");
static const int s_defaultsoundcard = -1;
static const int s_alsapollinterval = 250;
static QList<snd_mixer_selem_channel_id_t> kALSAChannelTypes(snd_mixer_elem_t *alsaelement, const bool capture)
{
@ -54,7 +55,6 @@ static QList<snd_mixer_selem_channel_id_t> kALSAChannelTypes(snd_mixer_elem_t *a
SND_MIXER_SCHN_REAR_CENTER,
SND_MIXER_SCHN_UNKNOWN
};
int counter = 0;
while (alsachanneltypes[counter] != SND_MIXER_SCHN_UNKNOWN) {
int alsaresult = 0;
@ -101,7 +101,7 @@ static bool kGetChannelVolumes(snd_mixer_elem_t *alsaelement, snd_mixer_selem_ch
return true;
}
static bool kIsMasterChannel(const QString &alsaelementname)
static bool kIsMasterElement(const QString &alsaelementname)
{
return alsaelementname.contains(QLatin1String("master"), Qt::CaseInsensitive);
}
@ -110,7 +110,7 @@ static bool kIsMasterChannel(const QString &alsaelementname)
// alsa-lib/src/control/hcontrol.c
static QString kIconForElement(const QString &alsaelementname)
{
if (kIsMasterChannel(alsaelementname)) {
if (kIsMasterElement(alsaelementname)) {
return QString::fromLatin1("mixer-master");
}
if (alsaelementname.contains(QLatin1String("capture"), Qt::CaseInsensitive)) {
@ -157,8 +157,7 @@ static int kFixedVolume(const int value, const int alsavolumemax)
static int kVolumeStep()
{
const int appscrolllines = QApplication::wheelScrollLines();
return qMax(appscrolllines, 1);
return qMax(QApplication::wheelScrollLines(), 1);
}
static int kStepVolume(const int value, const int maxvalue, const int step)
@ -193,6 +192,8 @@ static QIcon kMixerIcon(QObject *parent, const int value)
return result;
}
int k_alsa_element_callback(snd_mixer_elem_t *alsaelement, unsigned int alsamask);
class MixerTabWidget : public QGraphicsWidget
{
Q_OBJECT
@ -205,23 +206,28 @@ public:
void decreaseVolume();
void increaseVolume();
// public for the callback
QList<Plasma::Slider*> sliders;
Q_SIGNALS:
void mainVolumeChanged();
private Q_SLOTS:
void slotSliderMovedOrChanged(const int value);
void slotTimeout();
private:
QGraphicsLinearLayout* m_layout;
snd_mixer_t* m_alsamixer;
QString m_mainelement;
QList<Plasma::Slider*> m_sliders;
QTimer* m_timer;
};
MixerTabWidget::MixerTabWidget(Plasma::TabBar *tabbar)
: QGraphicsWidget(tabbar),
m_layout(nullptr),
m_alsamixer(nullptr)
m_alsamixer(nullptr),
m_timer(nullptr)
{
setMinimumSize(s_minimumsize);
setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
@ -232,6 +238,9 @@ MixerTabWidget::MixerTabWidget(Plasma::TabBar *tabbar)
MixerTabWidget::~MixerTabWidget()
{
if (m_timer) {
m_timer->stop();
}
if (m_alsamixer) {
snd_mixer_close(m_alsamixer);
}
@ -332,7 +341,7 @@ bool MixerTabWidget::setup(const int alsacard, const QByteArray &alsacardname)
slider, SIGNAL(valueChanged(int)),
this, SLOT(slotSliderMovedOrChanged(int))
);
m_sliders.append(slider);
sliders.append(slider);
framelayout->addItem(slider, 0, columncounter, 1, 1);
columncounter++;
}
@ -345,11 +354,13 @@ bool MixerTabWidget::setup(const int alsacard, const QByteArray &alsacardname)
framelayout->addItem(iconwidget, 1, 0, 1, columncounter);
framelayout->setAlignment(iconwidget, Qt::AlignCenter);
frame->setLayout(framelayout);
snd_mixer_elem_set_callback(alsaelement, k_alsa_element_callback);
snd_mixer_elem_set_callback_private(alsaelement, this);
m_layout->addItem(frame);
columncounter++;
if (m_mainelement.isEmpty() && kIsMasterChannel(alsaelementname)) {
if (m_mainelement.isEmpty() && kIsMasterElement(alsaelementname)) {
m_mainelement = alsaelementname;
} else {
alsaelementnames.append(alsaelementname);
@ -363,6 +374,16 @@ bool MixerTabWidget::setup(const int alsacard, const QByteArray &alsacardname)
m_layout->addStretch();
adjustSize();
if (hasvalidelement) {
m_timer = new QTimer(this);
m_timer->setInterval(s_alsapollinterval);
m_timer->setSingleShot(false);
connect(
m_timer, SIGNAL(timeout()),
this, SLOT(slotTimeout())
);
m_timer->start();
}
return hasvalidelement;
}
@ -404,7 +425,7 @@ QIcon MixerTabWidget::mainVolumeIcon()
void MixerTabWidget::decreaseVolume()
{
foreach (Plasma::Slider *slider, m_sliders) {
foreach (Plasma::Slider *slider, sliders) {
const QString alsaelementname = slider->property("_k_name").toString();
if (alsaelementname == m_mainelement) {
slider->setValue(kStepVolume(slider->value(), slider->maximum(), -kVolumeStep()));
@ -413,7 +434,7 @@ void MixerTabWidget::decreaseVolume()
}
void MixerTabWidget::increaseVolume()
{
foreach (Plasma::Slider *slider, m_sliders) {
foreach (Plasma::Slider *slider, sliders) {
const QString alsaelementname = slider->property("_k_name").toString();
if (alsaelementname == m_mainelement) {
slider->setValue(kStepVolume(slider->value(), slider->maximum(), kVolumeStep()));
@ -459,6 +480,42 @@ void MixerTabWidget::slotSliderMovedOrChanged(const int value)
kWarning() << "Could not find the element" << alsaelementindex;
}
void MixerTabWidget::slotTimeout()
{
if (!m_alsamixer) {
return;
}
snd_mixer_handle_events(m_alsamixer);
}
int k_alsa_element_callback(snd_mixer_elem_t *alsaelement, unsigned int alsamask)
{
MixerTabWidget* mixertabwidget = static_cast<MixerTabWidget*>(snd_mixer_elem_get_callback_private(alsaelement));
Q_ASSERT(mixertabwidget != nullptr);
foreach (Plasma::Slider *slider, mixertabwidget->sliders) {
const uint alsaelementindex = slider->property("_k_index").toUInt();
const QString alsaelementname = slider->property("_k_name").toString();
if (snd_mixer_selem_get_index(alsaelement) == alsaelementindex
&& QString::fromLocal8Bit(snd_mixer_selem_get_name(alsaelement)) == alsaelementname) {
const int alsaelementchannel = slider->property("_k_channel").toInt();
const bool alsahascapture = snd_mixer_selem_has_capture_volume(alsaelement);
long alsavolumemin = 0;
long alsavolumemax = 0;
long alsavolume = 0;
const bool gotvolumes = kGetChannelVolumes(
alsaelement, snd_mixer_selem_channel_id_t(alsaelementchannel), alsahascapture,
&alsavolumemin, &alsavolumemax, &alsavolume
);
if (!gotvolumes) {
continue;
}
slider->setRange(int(alsavolumemin), int(alsavolumemax));
slider->setValue(int(alsavolume));
}
}
return 0;
}
class MixerWidget : public Plasma::TabBar
{