Method Scrollbar

pj_widgets/src/Scrollbar.cpp:56–68

namespace PJ {

Scrollbar::Scrollbar(Qt::Orientation orientation, QWidget* parent) : QWidget(parent), orientation_(orientation) {
  // Transparent overlay: never intercepts mouse events, paints over the native
  // scroll-bar gutter without a system background or opaque window behind it.
  setAttribute(Qt::WA_TransparentForMouseEvents, true);
  setAttribute(Qt::WA_NoSystemBackground, true);
  setAttribute(Qt::WA_TranslucentBackground, true);

  // Theme-aware default accent (info-blue on light, pale grey on dark), keyed
  // off QPalette::Window — NOT QPalette::Highlight, which the app never sets and
  // would otherwise leak the OS accent (e.g. Yaru orange). Re-read on theme
  // changes in changeEvent() unless the caller pins a color via setAccentColor().
  accent_ = scrollbar_detail::defaultAccent(QGuiApplication::palette().window().color());
}

void Scrollbar::attach(QAbstractScrollArea* area) {
  area_ = area;