C++ 多次调用QtWebPage-loadFinished()
在我的应用程序中,我有列表视图。选择其中的另一项会触发一个事件:C++ 多次调用QtWebPage-loadFinished(),c++,qt,qtwebkit,C++,Qt,Qtwebkit,在我的应用程序中,我有列表视图。选择其中的另一项会触发一个事件: connect(listView->selectionModel(), SIGNAL(currentChanged(const QModelIndex &, const QModelIndex &)), this, SLOT(item_changed(const QModelIndex &, const QModelIndex &))); void MainWindow::item_chan
connect(listView->selectionModel(), SIGNAL(currentChanged(const QModelIndex &, const QModelIndex &)), this, SLOT(item_changed(const QModelIndex &, const QModelIndex &)));
void MainWindow::item_changed(const QModelIndex & current, const QModelIndex & previous)
{
qDebug() << "\n" << "item_changed(), caller: " << sender()->objectName();
if (current.isValid())
{
/*
not so important code
*/
change_query(tokens.join("+"));
}
}
如您所见,每次我更改选择时,都会创建并加载另一个WebFrame实例(?),或者每次循环加载页面+1次。我花了2个小时找出了问题所在,但我什么也没看到。您应该只将信号连接到插槽一次,在构造函数中是可能的 相反,你打电话
connect(frame, SIGNAL(loadFinished(bool)), this, SLOT(loading_finished()));
每次更换物品时。所以,你的插槽被调用了很多次,就像你调用
connect
哦,该死,我完全忘了那一行。几乎所有内容都被注释掉了,但这个除外。>>真可惜。非常感谢你
void MainWindow::loading_finished()
{
qDebug() << "loading_finished(), caller: " << sender()->objectName();
}
item_changed(), caller: "SelectionModel"
change_query(), caller: "SelectionModel"
loading_finished(), caller: "frame"
item_changed(), caller: "SelectionModel"
change_query(), caller: "SelectionModel"
loading_finished(), caller: "frame"
loading_finished(), caller: "frame"
item_changed(), caller: "SelectionModel"
change_query(), caller: "SelectionModel"
loading_finished(), caller: "frame"
loading_finished(), caller: "frame"
loading_finished(), caller: "frame"
item_changed(), caller: "SelectionModel"
change_query(), caller: "SelectionModel"
loading_finished(), caller: "frame"
loading_finished(), caller: "frame"
loading_finished(), caller: "frame"
loading_finished(), caller: "frame"
connect(frame, SIGNAL(loadFinished(bool)), this, SLOT(loading_finished()));