C++ (Cpp) ViewItem::mapFromScene示例

/*
 * This is reimplemented because of a bug in Qt 4.3 QGraphicScene in the
 * way it handles context menu events.  The docs say that if an item ignores
 * this event that it'll be passed down to the next item underneath.  However,
 * this does not happen in the default implementation.
 */
void Scene::contextMenuEvent(QGraphicsSceneContextMenuEvent *event) {
  QList<QGraphicsItem*> list = items(event->scenePos());
  foreach (QGraphicsItem *item, list) {
    ViewItem *viewItem = qgraphicsitem_cast<ViewItem*>(item);
    if (!viewItem)
      continue;

    if (viewItem->acceptsContextMenuEvents()) {
        event->setPos(viewItem->mapFromScene(event->scenePos()));
        if (viewItem->sceneEvent(event))
          return;
    }
  }

示例#2

显示文件

文件： scene.cpp 项目： RossWilliamson/kst_old

/*
 * This is reimplemented because of a bug in Qt 4.3 QGraphicScene in the
 * way it handles context menu events.  The docs say that if an item ignores
 * this event that it'll be passed down to the next item underneath.  However,
 * this does not happen in the default implementation.
 */
void Scene::contextMenuEvent(QGraphicsSceneContextMenuEvent *event) {
  QList<QGraphicsItem*> list = items(event->scenePos());
  if (list.isEmpty()) {
    if (View *view = qobject_cast<View*>(parent())) {
      view->viewContextMenuEvent();
    }
  } else {
    foreach (QGraphicsItem *item, list) {
      ViewItem *viewItem = dynamic_cast<ViewItem*>(item);
      if (!viewItem)
        continue;

      if (viewItem->acceptsContextMenuEvents()) {
          event->setPos(viewItem->mapFromScene(event->scenePos()));
          if (viewItem->doSceneEvent(event))
            return;
      }
    }
  }