Add support for handling external sink/source volume change events

Subscribes to PA volume change events, updating the local cached
volume levels, and propagating the change to the UI. This allows
changes to sink/source volumes levels from the command line (pactl)
or a master volume control to be reflected in the mixer UI controls.

Change-Id: I1d570dffeab9fcf4b6ba51e4792852b44a6149ca
AGL-Bug: SPEC-549
Signed-off-by: Matt Porter <mporter@konsulko.com>

1 files changed, 25 insertions, 2 deletions

diff --git a/app/pacontrolmodel.cpp b/app/pacontrolmodel.cpp
index bca72c5..fe5de53 100644
--- a/app/pacontrolmodel.cpp
+++ b/app/pacontrolmodel.cpp
@@ -82,7 +82,8 @@ void PaControl::setVolume(PaControlModel *pacm, const QVariant &volume)
 {
 	if (volume != m_volume) {
 		m_volume = volume.toUInt();
-		emit pacm->volumeChanged(type(), cindex(), channel(), m_volume);
+		if (pacm)
+			emit pacm->volumeChanged(type(), cindex(), channel(), m_volume);
 	}
 }
 
@@ -103,6 +104,26 @@ void PaControlModel::addOneControl(int cindex, QString desc, int type, int chann
 	addControl(PaControl(cindex, desc, type, channel, cdesc, volume));
 }
 
+void PaControlModel::changeExternalVolume(uint32_t type, uint32_t cindex, uint32_t channel, uint32_t volume)
+{
+	QList<PaControl>::iterator i;
+	int row;
+
+	for (i = m_controls.begin(), row = 0; i < m_controls.end(); ++i, ++row) {
+		if ((i->type() == type) &&
+		    (i->cindex() == cindex) &&
+		    (i->channel() == channel)) {
+			break;
+		}
+	}
+
+	i->setVolume(NULL, QVariant(volume));
+	QModelIndex qmindex = index(row);
+	QVector<int> roles;
+	roles.push_back(VolumeRole);
+	emit dataChanged(qmindex, qmindex, roles);
+}
+
 int PaControlModel::rowCount(const QModelIndex & parent) const {
 	Q_UNUSED(parent);
 	return m_controls.count();
@@ -124,7 +145,9 @@ bool PaControlModel::setData(const QModelIndex &index, const QVariant &value, in
 		control.setCDesc(value);
 	else if (role == VolumeRole)
 		control.setVolume(this, value);
-	emit dataChanged(index, index);
+	QVector<int> roles;
+	roles.push_back(role);
+	emit dataChanged(index, index, roles);
 	return true;
 }