通过互联网搜索,我遇到了很多方法,主要是非功能性,非特定功能或部分功能,可以使用QWebView和打开URL进行各种操作.
经过多次咒骂和诅咒之后,我设法得到了一个例子来做我想要的,通常是开放的普通链接,并打开任何在外部浏览器中请求新窗口的内容;然而,有一个障碍.它泄漏了内存,因为我制作了一堆额外的WebView,直到进程退出时才清理它们.如何在不泄漏记忆的情况下做到这一点？
请提前原谅我对Qt的二年级理解.在这一点上我只用了几个小时.
SSCCE：
test.hpp
#include <QMainWindow>
#include <QWebView>
class Window : public QMainWindow {
Q_OBJECT
public:
Window();
private:
QWebView* m_web;
private slots:
};
class WebPage : public QWebPage {
Q_OBJECT
public:
bool acceptNavigationRequest(QWebFrame *frame,const QNetworkRequest &request,NavigationType type);
};
class WebView : public QWebView {
Q_OBJECT
public:
QWebView* createWindow(QWebPage::WebWindowType type);
};
TEST.CPP
#include <QApplication>
#include <QGridLayout>
#include <QNetworkRequest>
#include <QDesktopServices>
#include "test.hpp"
Window::Window() :
QMainWindow() {
m_web = new WebView;
m_web->setHtml("<div align=\"center\"><a href=\"http://www.google.com/\">Same Window</a> <a href=\"http://www.google.com/\" target=\"_blank\">New Window</a></div>");
setCentralWidget(m_web);
}
bool WebPage::acceptNavigationRequest(QWebFrame*,QNetworkRequest const& request,NavigationType) {
QDesktopServices::openUrl(request.url());
return false;
}
QWebView* WebView::createWindow(QWebPage::WebWindowType) {
auto res = new WebView;
auto page = new WebPage;
res->setPage(page);
return res;
}
int main(int argc,char *argv[]) {
QApplication a(argc,argv);
Window w;
w.show();
return a.exec();
}
test.pro
QT += core gui network webkitwidgets widgets TEMPLATE = app TARGET = test INCLUDEPATH += . CONFIG += c++11 # Input SOURCES += test.cpp HEADERS += test.hpp
编译和运行
qmake test.pro make ./test
解决方法
在extern浏览器中呈现页面后,视图似乎变得无用.
您可以使用deleteLater()安排ExternalWebView删除：
您可以使用deleteLater()安排ExternalWebView删除：
#include <iostream>
#include <QApplication>
#include <QGridLayout>
#include <QNetworkRequest>
#include <QDesktopServices>
#include <QEvent>
#include <QMainWindow>
#include <QWebView>
class ExternWebPage : public QWebPage {
//Q_OBJECT
public:
ExternWebPage(QObject* parent = 0)
: QWebPage(parent)
{
std::cout << "ExternWebPage" << std::endl;
}
~ExternWebPage() {
std::cout << "Destroy ExternWebPage" << std::endl;
}
virtual bool event(QEvent *e) {
static unsigned counter;
std::cout << ++counter << " ExternWebPage: " << e->type() << std::endl;
return QWebPage::event(e);
}
bool acceptNavigationRequest(QWebFrame *,NavigationType) {
QDesktopServices::openUrl(request.url());
return false;
}
};
class ExternWebView : public QWebView {
//Q_OBJECT
public:
ExternWebView(QWidget* parent = 0)
: QWebView(parent)
{
std::cout << "ExternWebView" << std::endl;
}
~ExternWebView() { std::cout << "Destroy ExternWebView" << std::endl; }
virtual bool event(QEvent *e) {
static unsigned counter;
std::cout << ++counter << " ExternWebView: " << e->type() << std::endl;
return QWebView::event(e);
}
};
class InternalWebView : public QWebView {
//Q_OBJECT
public:
InternalWebView(QWidget* parent = 0)
: QWebView(parent)
{}
QWebView* createWindow(QWebPage::WebWindowType) {
auto res = new ExternWebView();
res->setPage(new ExternWebPage(res));
res->deleteLater();
return res;
}
};
class Window : public QMainWindow {
//Q_OBJECT
public:
Window()
: QMainWindow()
{
std::cout << "Window" << std::endl;
auto web = new InternalWebView(this);
web->setHtml("<div align=\"center\"><a href=\"http://www.google.com/\">Same Window</a> <a href=\"http://www.google.com/\" target=\"_blank\">New Window</a></div>");
setCentralWidget(web);
}
~Window() { std::cout << "Destroy Window" << std::endl; }
};
int main(int argc,argv);
Window w;
w.show();
return a.exec();
}
测试没有删除：
Window ExternWebView 1 ExternWebView: 68 ExternWebPage 2 ExternWebView: 74 3 ExternWebView: 75 1 ExternWebPage: 43 2 ExternWebPage: 43 3 ExternWebPage: 43 4 ExternWebPage: 43 5 ExternWebPage: 43 Destroy Window
稍后删除测试：
ExternWebView 1 ExternWebView: 68 ExternWebPage 2 ExternWebView: 74 3 ExternWebView: 75 4 ExternWebView: 52 Destroy ExternWebView Destroy ExternWebPage Destroy Window
