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 - pressedPos();
if (delta > 0)
delta = min(maxPos - thumbPos, delta);
else if (delta < 0)
delta = max(-thumbPos, delta);
if (delta) {
setValue(static_cast<int>(static_cast<float>(thumbPos + delta) * maximum() / (trackLen - thumbLen)));
setPressedPos(pressedPos() + theme()->thumbPosition(this) - thumbPos);
}
}
bool Scrollbar::thumbWillBeUnderMouse() const {
int thumbPos = theme().trackPosition(*this) +
theme().thumbPosition(*this, scrollableAreaTargetPos());
int thumbLength = theme().thumbLength(*this);
return pressedPos() >= thumbPos && pressedPos() < thumbPos + thumbLength;
}
