diff options
| author | Thomas McGuire <thomas.mcguire.qnx@kdab.com> | 2012-07-09 14:15:59 +0200 |
|---|---|---|
| committer | Qt by Nokia <qt-info@nokia.com> | 2012-07-12 02:28:35 +0200 |
| commit | 5464963f9afae3bf7329d9b0ea7102231125f794 (patch) | |
| tree | 840eaf19cea84d2185105272a651dc1675130731 /src/sensors | |
| parent | a355c3a54cdc1c8bfd2129307c7824dd7012bd11 (diff) | |
Blackberry: Implement buffering
The API provided by QSensor does not fit nicely for what the OS
service API provides. Instead of adding yet another buffer-related
property to QSensor, I added documentation to QSensor describing
the differences in behaviour.
Change-Id: I2d81d9c62ce7e8b50c27631a28aa7fbcaca70373
Reviewed-by: Adam Parco <aparco@rim.com>
Reviewed-by: Lorn Potter <lorn.potter@nokia.com>
Diffstat (limited to 'src/sensors')
| -rw-r--r-- | src/sensors/qsensor.cpp | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/src/sensors/qsensor.cpp b/src/sensors/qsensor.cpp index 2949e771..be0c7862 100644 --- a/src/sensors/qsensor.cpp +++ b/src/sensors/qsensor.cpp @@ -776,6 +776,17 @@ int QSensor::error() const When the sensor is started with buffering option, values are collected from that moment onwards. There is no pre-existing buffer that can be utilized. + Some backends like Blackberry only support enabling or disabling the buffer and do not give + control over the size. In this case, the maxBufferSize and efficientBufferSize properties + might not be set at all, even though buffering is supported. Setting the bufferSize property + to any value greater than 1 will enable buffering. After the sensor has been started, + the bufferSize property will be set to the actual value by the backend. + + On Blackberry, buffering will not wait until the buffer is full to deliver new + readings. Instead, the buffer will be used if the backend does not manage to retrieve the readings + in time, for example when the event loop is blocked for too long. Without a buffer, these readings + would simply be dropped. + The buffer size can only be changed while the sensor is not active. \sa QSensor::maxBufferSize, QSensor::efficientBufferSize |