mobile/profile: adjust offsets when scaling

If the user is scaling out again we need to make sure that our offsets
are adjusted so that we always show a subset of the profile and not
'empty space' outside of it. Instead of reimplementing the offset logic,
let's just trigger another paint() call.
This requires a trampoline function because of different signal and slot
signatures.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

profile-widget/qmlprofile.cpp

@@ -24,9 +24,20 @@ QMLProfile::QMLProfile(QQuickItem *parent) :
 	m_profileWidget->setPrintMode(true);
 	m_profileWidget->setFontPrintScale(fontScale);
 	connect(QMLManager::instance(), &QMLManager::sendScreenChanged, this, &QMLProfile::screenChanged);
+	connect(this, &QMLProfile::scaleChanged, this, &QMLProfile::triggerUpdate);
 	setDevicePixelRatio(QMLManager::instance()->lastDevicePixelRatio());
 }
 
+// we need this so we can connect update() to the scaleChanged() signal - which the connect above cannot do
+// directly as it chokes on the default parameter for update().
+// If the scale changes we may need to change our offsets to ensure that we still only show a subset of
+// the profile and not empty space around it, which the paint() method below will take care of, which will
+// eventually get called after we call update()
+void QMLProfile::triggerUpdate()
+{
+	update();
+}
+
 void QMLProfile::paint(QPainter *painter)
 {
 	QElapsedTimer timer;

profile-widget/qmlprofile.h

@@ -28,6 +28,8 @@ public:
 public slots:
 	void setMargin(int margin);
 	void screenChanged(QScreen *screen);
+	void triggerUpdate();
+
 private:
 	int m_diveId;
 	qreal m_devicePixelRatio;