Qgraphics removeitem
WebremoveItem（） 移除项目: selectedItems（） 返回所有当前选定项的列表。这些项目不按特定顺序返回: selectionArea（） setSelectionArea（） 选择区域: stickyFocus（） … WebremoveItem（） 移除项目: selectedItems（） 返回所有当前选定项的列表。这些项目不按特定顺序返回: selectionArea（） setSelectionArea（） 选择区域: stickyFocus（） setstickyFocus（） 单击场景背景是否会清除焦点: update（QRectF） 更新数据: views() 获取所有视图的列表
Qgraphics removeitem
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WebAccepted answer TL;DR: The solution is to ensure that QGraphicsItem::prepareGeometryChange () gets called before the item's removal from the scene. The problem is that during the item removal from the scene, the scene internal index was not properly updated, resulting in the crash upon the next attempt of drawing the scene. WebTo remove an item, call removeItem (). QGraphicsScene uses an indexing algorithm to manage the location of items efficiently. By default, a BSP (Binary Space Partitioning) tree …
WebMay 8, 2014 · QGraphicsItem *graphicItem = allGraphicsItems [i]; scene->removeItem (graphicItem); delete graphicItem; scene->update (); } qDebug ()<<"End of hideButtons ()"; … Web1- Make sure no thread other than the main thread calls into Qt GUI stuff. 2- Sometimes, the ‘underlying C++ object’ will be deleted by python/Qt, even though python still has a reference to it somewhere. You can try sticking all your instances into some global list and see if that gets rid of the problem (which is better solved in another way!).
WebNov 13, 2014 · 3. There is something weird with QGraphicsScene::removeItem, when I remove two items from the scene I get the following message: QGraphicsScene::removeItem: item 0x5edb28's scene (0x0) is different from this scene (0x5e7790) QGraphicsScene::removeItem: item 0x5edc18's scene (0x0) is different from … WebApr 22, 2024 · QGraphicsItem * itemToRemove = NULL; foreach (auto item, items (event->scenePos ())) { if (item->type () == QGraphicsItem::UserType+1) { itemToRemove = item; …
WebTo dismantle ("ungroup") an item group, you can either call QGraphicsScene::destroyItemGroup (), or you can manually remove all items from the group by calling removeFromGroup (). lylewenzel gmail.comWebQGraphicsItem *item = m_items.takeFirst (); m_scene->removeItem (item); // qtdoc says it's faster to remove item first then delete delete item; } When you call removeItem, its children are removed from the scene as well; when you delete it, these children will be deleted immediately, too. lyle\\u0026scott saleWeb若要删除项，请调用RemoveItem()。 QGraphicScene使用索引算法来有效地管理项目的位置。 默认情况下，使用BSP(二进制空间分区)树；该算法适用于大多数项目保持静态(即不移动)的大型场景。 lyle \\u0026 scott saleWebremoveItem(self, QGraphicsItem item) render(self, QPainter painter, QRectF target = QRectF(), QRectF source = QRectF(), Qt.AspectRatioMode mode = Qt.KeepAspectRatio) QRectF sceneRect(self) list-of-QGraphicsItem selectedItems(self) QPainterPath selectionArea(self) bool sendEvent(self, QGraphicsItem item, QEvent event) lyle \\u0026 scott ukWeb这个类翻译了好久，实在是成员函数太多了，分享出来，希望对大家有用，多多支持哦~~ 详细介绍. QGraphicsItem 类是视图框架的一部分，是在一个QGraphicsScene中最基本的图形类，它为绘制你. 自己的item提供了一个轻量级的窗口，包括声明item的位置，碰撞检测，绘制重载和item之间的相 lyle vertical trimpressWebFeb 14, 2024 · 场景中图形项删除的时候调用系统函数removeItem()删除该图形项，但还需将图形项delete掉，并置为空，主要代码如下： void … lyle \u0026 scott slippersWebAug 16, 2024 · Fix QGraphicsScene::removeItem: item 0x56180d0b4680's scene (0x0) is different from this scene (0x56180cfe8e30) #290 Closed richelbilderbeek opened this issue on Aug 16, 2024 · 3 comments Owner richelbilderbeek commented on Aug 16, 2024 From the Ruffian: richelbilderbeek self-assigned this on Aug 16, 2024 lyle \u0026 scott size guide