我有一个非常令人沮丧的问题,试图删除我的应用程序中的qgraphicsitems。我有一个菜单控制器负责将按钮添加到布局并将其添加到场景中。这些按钮都与自定义信号和插槽连接。当我改变状态时,我想删除这个控制器并删除所有这些qgraphicsitems。在QGraphicsScene中从QGraphicsLinearLayout删除QGraphics项目
继承人我如何加入他们在我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);
最后,我的析构函数是这样的:
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
我从场景中删除每个按钮,断开连接按钮,然后尝试在它们上调用删除。
我每次都会收到一个分段错误。场景项目删除正常,并且断开连接正常工作,但由于某种原因,当我删除项目时,它会引发分段错误并使程序崩溃。