/*! Override the BSlider functionality to be able to grab the knob when
it's over 0 dB for some pixels.
*/
void
VolumeControl::MouseMoved(BPoint where, uint32 transit,
const BMessage* dragMessage)
{
if (!IsTracking()) {
BSlider::MouseMoved(where, transit, dragMessage);
return;
}
float cursorPosition = Orientation() == B_HORIZONTAL ? where.x : where.y;
if (fSnapping && cursorPosition >= fMinSnap && cursorPosition <= fMaxSnap) {
// Don't move the slider, keep the current value for a few
// more pixels
return;
}
fSnapping = false;
int32 oldValue = Value();
int32 newValue = ValueForPoint(where);
if (oldValue == newValue) {
BSlider::MouseMoved(where, transit, dragMessage);
return;
}
// Check if there is a 0 dB transition at all
if ((oldValue < 0 && newValue >= 0) || (oldValue > 0 && newValue <= 0)) {
SetValue(0);
if (ModificationMessage() != NULL)
Messenger().SendMessage(ModificationMessage());
float snapPoint = _PointForValue(0);
const float kMinSnapOffset = 6;
if (oldValue > newValue) {
// movement from right to left
fMinSnap = _PointForValue(-4);
if (fabs(snapPoint - fMinSnap) < kMinSnapOffset)
fMinSnap = snapPoint - kMinSnapOffset;
fMaxSnap = _PointForValue(1);
} else {
// movement from left to right
fMinSnap = _PointForValue(-1);
fMaxSnap = _PointForValue(4);
if (fabs(snapPoint - fMaxSnap) < kMinSnapOffset)
fMaxSnap = snapPoint + kMinSnapOffset;
}
fSnapping = true;
return;
}
BSlider::MouseMoved(where, transit, dragMessage);
}
void
BSlider::MouseDown(BPoint point)
{
if (!IsEnabled())
return;
if (BarFrame().Contains(point) || ThumbFrame().Contains(point))
fInitialLocation = _Location();
uint32 buttons;
GetMouse(&point, &buttons, true);
_ConstrainPoint(point, fInitialLocation);
SetValue(ValueForPoint(point));
if (_Location() != fInitialLocation)
InvokeNotify(ModificationMessage(), B_CONTROL_MODIFIED);
if (Window()->Flags() & B_ASYNCHRONOUS_CONTROLS) {
SetTracking(true);
SetMouseEventMask(B_POINTER_EVENTS, B_LOCK_WINDOW_FOCUS | B_NO_POINTER_HISTORY);
} else {
// synchronous mouse tracking
BPoint prevPoint;
while (buttons) {
prevPoint = point;
snooze(SnoozeAmount());
GetMouse(&point, &buttons, true);
if (_ConstrainPoint(point, prevPoint)) {
int32 value = ValueForPoint(point);
if (value != Value()) {
SetValue(value);
InvokeNotify(ModificationMessage(), B_CONTROL_MODIFIED);
}
}
}
if (_Location() != fInitialLocation)
Invoke();
}
}
void
BSlider::MouseMoved(BPoint point, uint32 transit, const BMessage *message)
{
if (IsTracking()) {
if (_ConstrainPoint(point, _Location())) {
int32 value = ValueForPoint(point);
if (value != Value()) {
SetValue(value);
InvokeNotify(ModificationMessage(), B_CONTROL_MODIFIED);
}
}
} else
BControl::MouseMoved(point, transit, message);
}
