// Implements steps according to the current speed
// You must call this at least once per step
// returns true if a step occurred
boolean EightAccelStepper::runSpeed()
{
unsigned long time = millis();
if (time > getLastStepTime() + getStepInterval())
{
if (getSpeed() > 0)
{
// Clockwise
setCurrentPos(getCurrentPos() + 1);
}
else if (getSpeed() < 0)
{
// Anticlockwise
setCurrentPos(getCurrentPos() - 1);
}
if (getPins() == 8) {
step(getCurrentPos() & 0x7); // Bottom 3 bits (same as mod 8, but works with + and - numbers)
} else {
step(getCurrentPos() & 0x3); // Bottom 2 bits (same as mod 4, but works with + and - numbers)
}
setLastStepTime(time);
return true;
}
else
return false;
}
bool Scrollbar::scroll(ScrollDirection direction, ScrollGranularity granularity, float multiplier)
{
#if HAVE(ACCESSIBILITY)
if (AXObjectCache::accessibilityEnabled()) {
if (parent() && parent()->isFrameView()) {
Document* document = static_cast<FrameView*>(parent())->frame()->document();
AXObjectCache* cache = document->axObjectCache();
AccessibilityScrollbar* axObject = static_cast<AccessibilityScrollbar*>(cache->getOrCreate(ScrollBarRole));
axObject->setScrollbar(this);
cache->postNotification(axObject, document, AXObjectCache::AXValueChanged, true);
}
}
#endif
// Ignore perpendicular scrolls.
if ((m_orientation == HorizontalScrollbar) ? (direction == ScrollUp || direction == ScrollDown) : (direction == ScrollLeft || direction == ScrollRight))
return false;
float step = 0;
switch (granularity) {
case ScrollByLine: step = m_lineStep; break;
case ScrollByPage: step = m_pageStep; break;
case ScrollByDocument: step = m_totalSize; break;
case ScrollByPixel: step = m_pixelStep; break;
}
if (direction == ScrollUp || direction == ScrollLeft)
multiplier = -multiplier;
if (client())
return client()->scroll(m_orientation, granularity, step, multiplier);
return setCurrentPos(max(min(m_currentPos + (step * multiplier), static_cast<float>(m_totalSize - m_visibleSize)), 0.0f), NotFromScrollAnimator);
}
bool Scrollbar::setValue(int v, ScrollSource source)
{
v = max(min(v, m_totalSize - m_visibleSize), 0);
if (value() == v)
return false; // Our value stayed the same.
setCurrentPos(v, source);
return true;
}
bool StreamReader::read(quint64 pos, int *length, char *buffer)
{
QMutexLocker lock(&m_mutex);
DEBUG_BLOCK;
bool ret = true;
if (m_unlocked) {
return ret;
}
if (currentPos() != pos) {
if (!streamSeekable()) {
return false;
}
setCurrentPos(pos);
}
if (m_buffer.capacity() < *length) {
m_buffer.reserve(*length);
}
while (currentBufferSize() < static_cast<unsigned int>(*length)) {
quint64 oldSize = currentBufferSize();
needData();
m_waitingForData.wait(&m_mutex);
if (oldSize == currentBufferSize()) {
if (m_eos && m_buffer.isEmpty()) {
return false;
}
// We didn't get any more data
*length = static_cast<int>(oldSize);
// If we have some data to return, why tell to reader that we failed?
// Remember that length argument is more like maxSize not requiredSize
ret = true;
}
}
if (m_mediaObject->state() != Phonon::BufferingState &&
m_mediaObject->state() != Phonon::LoadingState) {
enoughData();
}
memcpy(buffer, m_buffer.data(), *length);
m_pos += *length;
// trim the buffer by the amount read
m_buffer = m_buffer.mid(*length);
return ret;
}
void Scrollbar::moveThumb(int pos)
{
// Drag the thumb.
int thumbPos = theme()->thumbPosition(this);
int thumbLen = theme()->thumbLength(this);
int trackLen = theme()->trackLength(this);
int maxPos = trackLen - thumbLen;
int delta = pos - m_pressedPos;
if (delta > 0)
delta = min(maxPos - thumbPos, delta);
else if (delta < 0)
delta = max(-thumbPos, delta);
if (delta)
setCurrentPos(static_cast<float>(thumbPos + delta) * maximum() / (trackLen - thumbLen), NotFromScrollAnimator);
}
HRESULT read(LONGLONG pos, LONG length, BYTE *buffer, LONG *actual)
{
QMutexLocker locker(&m_mutexRead);
if (m_mediaGraph->isStopping()) {
return VFW_E_WRONG_STATE;
}
if(streamSize() != 1 && pos + length > streamSize()) {
//it tries to read outside of the boundaries
return E_FAIL;
}
if (currentPos() - currentBufferSize() != pos) {
if (!streamSeekable()) {
return S_FALSE;
}
setCurrentPos(pos);
}
int oldSize = currentBufferSize();
while (currentBufferSize() < int(length)) {
needData();
if (m_mediaGraph->isStopping()) {
return VFW_E_WRONG_STATE;
}
if (oldSize == currentBufferSize()) {
break; //we didn't get any data
}
oldSize = currentBufferSize();
}
DWORD bytesRead = qMin(currentBufferSize(), int(length));
{
QWriteLocker locker(&m_lock);
qMemCopy(buffer, m_buffer.data(), bytesRead);
//truncate the buffer
m_buffer = m_buffer.mid(bytesRead);
}
if (actual) {
*actual = bytesRead; //initialization
}
return bytesRead == length ? S_OK : S_FALSE;
}
bool Tokenizer::findToken(U32 start, const char* pCmp)
{
// Move to the start
setCurrentPos(start);
// In case the first token is what we are looking for
if (tokenICmp(pCmp))
return true;
// Loop through the file and see if the token exists
while (advanceToken(true))
{
if (tokenICmp(pCmp))
return true;
}
return false;
}
bool Scrollbar::scroll(ScrollDirection direction, ScrollGranularity granularity, float multiplier)
{
float step = 0;
if ((direction == ScrollUp && m_orientation == VerticalScrollbar) || (direction == ScrollLeft && m_orientation == HorizontalScrollbar))
step = -1;
else if ((direction == ScrollDown && m_orientation == VerticalScrollbar) || (direction == ScrollRight && m_orientation == HorizontalScrollbar))
step = 1;
if (granularity == ScrollByLine)
step *= m_lineStep;
else if (granularity == ScrollByPage)
step *= m_pageStep;
else if (granularity == ScrollByDocument)
step *= m_totalSize;
else if (granularity == ScrollByPixel)
step *= m_pixelStep;
float newPos = m_currentPos + step * multiplier;
float maxPos = m_totalSize - m_visibleSize;
return setCurrentPos(max(min(newPos, maxPos), 0.0f));
}
bool Scrollbar::mouseMoved(const PlatformMouseEvent& evt)
{
if (m_pressedPart == ThumbPart) {
if (theme()->shouldSnapBackToDragOrigin(this, evt))
setCurrentPos(m_dragOrigin, NotFromScrollAnimator);
else {
moveThumb(m_orientation == HorizontalScrollbar ?
convertFromContainingWindow(evt.pos()).x() :
convertFromContainingWindow(evt.pos()).y());
}
return true;
}
if (m_pressedPart != NoPart)
m_pressedPos = (orientation() == HorizontalScrollbar ? convertFromContainingWindow(evt.pos()).x() : convertFromContainingWindow(evt.pos()).y());
ScrollbarPart part = theme()->hitTest(this, evt);
if (part != m_hoveredPart) {
if (m_pressedPart != NoPart) {
if (part == m_pressedPart) {
// The mouse is moving back over the pressed part. We
// need to start up the timer action again.
startTimerIfNeeded(theme()->autoscrollTimerDelay());
theme()->invalidatePart(this, m_pressedPart);
} else if (m_hoveredPart == m_pressedPart) {
// The mouse is leaving the pressed part. Kill our timer
// if needed.
stopTimerIfNeeded();
theme()->invalidatePart(this, m_pressedPart);
}
}
setHoveredPart(part);
}
return true;
}
