我有一個非常令人沮喪的問題,試圖刪除我的應用程序中的qgraphicsitems。我有一個菜單控制器負責將按鈕添加到佈局並將其添加到場景中。這些按鈕都與自定義信號和插槽連接。當我改變狀態時,我想刪除這個控制器並刪除所有這些qgraphicsitems。在QGraphicsScene中從QGraphicsLinearLayout刪除QGraphics項目
繼承人我如何加入他們在我menu_controller.cpp:
QGraphicsWidget * temp;//this is used during iteration to add to the layout
this->layout = new QGraphicsLinearLayout(Qt::Vertical);//q graphics view layout
this->menu = new QGraphicsWidget;//holds the layout
// initialize the proper buttons
(this->game_state->is_logged_in()) ? (this->logged_in()) : (this->not_logged_in());//test whether or not the user is logged in to generate the correct menu
// now iterate through each button and add to the layout
for (int i = 0, z = this->buttons.size(); i < z; i++) {
temp = this->scene->addWidget(this->buttons[i]);//add widget to the scene
this->layout->addItem(temp);//add this widget to the layou
connect(this->buttons[i], SIGNAL(menu_selection(QString)), this, SLOT(set_menu_option(QString)));//connect the button to this
}
// set menu layout as the layout and then add the menu to the scene
this->menu->setLayout(this->layout);
this->position();
this->scene->addItem(this->menu);
最後,我的析構函數是這樣的:
QGraphicsScene * scene = this->game_state->get_scene();
QList<QGraphicsItem *> list = scene->items();
QList<QGraphicsItem *>::Iterator it = list.begin();
for (; it != list.end(); ++it)
if (*it)
scene->removeItem(*it);
for (int i = 0, z = this->buttons.size(); i < z; i++)
disconnect(this->buttons[i], 0, 0, 0);//button not connected to anything
// for each deletes each place in memory
for_each(this->buttons.begin(), this->buttons.end(), utilities::delete_ptr());
delete this->layout;//delete the layout container
delete this->menu;//delete the menu
我從場景中刪除每個按鈕,斷開連接按鈕,然後嘗試在它們上調用刪除。
我每次都會收到一個分段錯誤。場景項目刪除正常,並且斷開連接正常工作,但由於某種原因,當我刪除項目時,它會引發分段錯誤並使程序崩潰。