QtGradientStopsControllerPrivate::PositionColorMap QtGradientStopsControllerPrivate::stopsData(const PositionStopMap &stops) const
{
PositionColorMap data;
PositionStopMap::ConstIterator itStop = stops.constBegin();
while (itStop != stops.constEnd()) {
QtGradientStop *stop = itStop.value();
data[stop->position()] = stop->color();
++itStop;
}
return data;
}
QtGradientStop *QtGradientStopsModel::firstSelected() const
{
PositionStopMap stopList = stops();
PositionStopMap::ConstIterator itStop = stopList.constBegin();
while (itStop != stopList.constEnd()) {
QtGradientStop *stop = itStop.value();
if (isSelected(stop))
return stop;
++itStop;
};
return 0;
}
QColor QtGradientStopsModel::color(qreal pos) const
{
PositionStopMap gradStops = stops();
if (gradStops.isEmpty())
return QColor::fromRgbF(pos, pos, pos, 1.0);
if (gradStops.contains(pos))
return gradStops[pos]->color();
gradStops[pos] = 0;
PositionStopMap::ConstIterator itStop = gradStops.constFind(pos);
if (itStop == gradStops.constBegin()) {
++itStop;
return itStop.value()->color();
}
if (itStop == --gradStops.constEnd()) {
--itStop;
return itStop.value()->color();
}
PositionStopMap::ConstIterator itPrev = itStop;
PositionStopMap::ConstIterator itNext = itStop;
--itPrev;
++itNext;
double prevX = itPrev.key();
double nextX = itNext.key();
double coefX = (pos - prevX) / (nextX - prevX);
QColor prevCol = itPrev.value()->color();
QColor nextCol = itNext.value()->color();
QColor newColor;
newColor.setRgbF((nextCol.redF() - prevCol.redF() ) * coefX + prevCol.redF(),
(nextCol.greenF() - prevCol.greenF()) * coefX + prevCol.greenF(),
(nextCol.blueF() - prevCol.blueF() ) * coefX + prevCol.blueF(),
(nextCol.alphaF() - prevCol.alphaF()) * coefX + prevCol.alphaF());
return newColor;
}
void QtGradientStopsModel::moveStops(double newPosition)
{
QtGradientStop *current = currentStop();
if (!current)
return;
double newPos = newPosition;
if (newPos > 1)
newPos = 1;
else if (newPos < 0)
newPos = 0;
if (newPos == current->position())
return;
double offset = newPos - current->position();
QtGradientStop *first = firstSelected();
QtGradientStop *last = lastSelected();
if (first && last) { // multiselection
double maxOffset = 1.0 - last->position();
double minOffset = -first->position();
if (offset > maxOffset)
offset = maxOffset;
else if (offset < minOffset)
offset = minOffset;
}
if (offset == 0)
return;
bool forward = (offset > 0) ? false : true;
PositionStopMap stopList;
QList<QtGradientStop *> selected = selectedStops();
QListIterator<QtGradientStop *> it(selected);
while (it.hasNext()) {
QtGradientStop *stop = it.next();
stopList[stop->position()] = stop;
}
stopList[current->position()] = current;
PositionStopMap::ConstIterator itStop = forward ? stopList.constBegin() : stopList.constEnd();
while (itStop != (forward ? stopList.constEnd() : stopList.constBegin())) {
if (!forward)
--itStop;
QtGradientStop *stop = itStop.value();
double pos = stop->position() + offset;
if (pos > 1)
pos = 1;
if (pos < 0)
pos = 0;
if (current == stop)
pos = newPos;
QtGradientStop *oldStop = at(pos);
if (oldStop && !stopList.values().contains(oldStop))
removeStop(oldStop);
moveStop(stop, pos);
if (forward)
++itStop;
}
}
