QWebview - Reopen closed window - qt

Question

I'm developing a basic web browser in QT5 (IDE Qt Creator 2.6.2).
If I click on a link\anchor with target:
<a target="newWindow" href="http://stackoverflow.com">Test</a>
or execute an event that opens a pop-up (onclick, onmouseover, onkeydown, etc.):
<input type="button" value="Test" onclick="window.open('','newWindow');">
and close the newly opened window then I can not reopen that window. I click and nothing happens.
Following code to test:
test-qwebview.pro
QT += webkitwidgets network core gui
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
TARGET = browserqt
TEMPLATE = app
SOURCES += main.cpp\
mbrowserqt.cpp
HEADERS += mbrowserqt.h
FORMS += mbrowserqt.ui
# install
target.path = $$[QT_INSTALL_EXAMPLES]/webkitwidgets/previewer
INSTALLS += target
mbrowserqt.ui
<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
<class>mBROWSERQT</class>
<widget class="QMainWindow" name="mBROWSERQT">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>640</width>
<height>320</height>
</rect>
</property>
<property name="sizePolicy">
<sizepolicy hsizetype="Preferred" vsizetype="Preferred">
<horstretch>0</horstretch>
<verstretch>0</verstretch>
</sizepolicy>
</property>
<property name="baseSize">
<size>
<width>0</width>
<height>0</height>
</size>
</property>
<property name="windowTitle">
<string>Browser QT5</string>
</property>
<property name="layoutDirection">
<enum>Qt::LeftToRight</enum>
</property>
<property name="autoFillBackground">
<bool>false</bool>
</property>
<property name="documentMode">
<bool>false</bool>
</property>
<property name="tabShape">
<enum>QTabWidget::Rounded</enum>
</property>
<widget class="QWidget" name="centralWidget">
<property name="sizePolicy">
<sizepolicy hsizetype="Minimum" vsizetype="Minimum">
<horstretch>0</horstretch>
<verstretch>0</verstretch>
</sizepolicy>
</property>
<property name="minimumSize">
<size>
<width>50</width>
<height>50</height>
</size>
</property>
<property name="baseSize">
<size>
<width>0</width>
<height>0</height>
</size>
</property>
<layout class="QVBoxLayout" name="verticalLayout">
<property name="spacing">
<number>0</number>
</property>
<property name="sizeConstraint">
<enum>QLayout::SetMaximumSize</enum>
</property>
<property name="leftMargin">
<number>0</number>
</property>
<property name="topMargin">
<number>0</number>
</property>
<property name="rightMargin">
<number>0</number>
</property>
<property name="bottomMargin">
<number>0</number>
</property>
<item>
<widget class="QWebView" name="mybrowsertest">
<property name="sizePolicy">
<sizepolicy hsizetype="Preferred" vsizetype="Preferred">
<horstretch>0</horstretch>
<verstretch>0</verstretch>
</sizepolicy>
</property>
<property name="minimumSize">
<size>
<width>50</width>
<height>50</height>
</size>
</property>
<property name="maximumSize">
<size>
<width>16777215</width>
<height>16777215</height>
</size>
</property>
<property name="baseSize">
<size>
<width>0</width>
<height>0</height>
</size>
</property>
<property name="contextMenuPolicy">
<enum>Qt::DefaultContextMenu</enum>
</property>
<property name="acceptDrops">
<bool>true</bool>
</property>
<property name="layoutDirection">
<enum>Qt::LeftToRight</enum>
</property>
<property name="autoFillBackground">
<bool>false</bool>
</property>
<property name="url">
<url>
<string>about:blank</string>
</url>
</property>
</widget>
</item>
</layout>
</widget>
</widget>
<layoutdefault spacing="0" margin="0"/>
<customwidgets>
<customwidget>
<class>QWebView</class>
<extends>QWidget</extends>
<header>QtWebKitWidgets/QWebView</header>
</customwidget>
</customwidgets>
<resources/>
<connections/>
</ui>
mbrowserqt.h
#ifndef mBROWSERQT_H
#define mBROWSERQT_H
#include <QMainWindow>
namespace Ui {
class mBROWSERQT;
}
class mBROWSERQT : public QMainWindow
{
Q_OBJECT
public:
explicit mBROWSERQT(QWidget *parent = 0, bool q = false);
~mBROWSERQT();
private:
Ui::mBROWSERQT *ui;
//adicionado
public slots:
void closeMyWindow();
void resizeMyWindow(const QRect & geom);
};
#endif // mBROWSERQT_H
mbrowserqt.cpp
#include "mbrowserqt.h"
#include "ui_mbrowserqt.h"
#include <QtNetwork>
QWebSettings *settings;
class myWebPage : public QWebPage
{
bool acceptNavigationRequest(QWebFrame *frame, const QNetworkRequest &request, NavigationType type){
url = request.url();
return QWebPage::acceptNavigationRequest(frame,request,type);
}
virtual QWebPage * createWindow(QWebPage::WebWindowType type) {
Q_UNUSED(type);
QMainWindow *wx = new mBROWSERQT(NULL,true);
QWebView *wv = wx->findChild<QWebView*>("mybrowsertest");
//Test
connect(wv->page(), SIGNAL(windowCloseRequested()), wx, SLOT(deleteLater()));
wx->showNormal();
return wv->page();
}
private:
QUrl url;
};
mBROWSERQT::mBROWSERQT(QWidget *parent, bool q) :
QMainWindow(parent),
ui(new Ui::mBROWSERQT)
{
ui->setupUi(this);
ui->mybrowsertest->setPage(new myWebPage());
settings = QWebSettings::globalSettings();
settings->setAttribute(QWebSettings::LocalContentCanAccessRemoteUrls,true);
settings->setAttribute(QWebSettings::OfflineStorageDatabaseEnabled,true);
settings->setAttribute(QWebSettings::LocalContentCanAccessFileUrls,true);
settings->setAttribute(QWebSettings::JavascriptCanOpenWindows,true);
settings->setAttribute(QWebSettings::JavascriptCanCloseWindows,true);
settings->setAttribute(QWebSettings::JavascriptEnabled,true);
settings->setAttribute(QWebSettings::PluginsEnabled,true);
connect(ui->mybrowsertest->page(), SIGNAL(windowCloseRequested()), this, SLOT(closeMyWindow()));
connect(ui->mybrowsertest->page(), SIGNAL(geometryChangeRequested(const QRect)),
this, SLOT(resizeMyWindow(const QRect)));
qDebug() << "new Page (target or window.open): " << q;
if(q==false){
QString fPage = "<!DOCTYPE html>";
fPage.append("<html>\n");
fPage.append("<head>\n");
fPage.append("<script>\n");
fPage.append("function openWin(q){\n");
fPage.append("try{\n");
fPage.append("var myWindow=window.open('','test','width=200,height=100,top=50,left=50');\n");
fPage.append(" myWindow.document.write(\"<p>This is 'myWindow'</p>\");\n");
fPage.append("} catch (ee){ alert(ee); } }\n");
fPage.append("</script>\n");
fPage.append("</head>\n");
fPage.append("<body>\n");
fPage.append("<p><input type=\"button\" value=\"Test window.open\" onclick=\"openWin();\"></p>\n");
fPage.append("<p><a target=\"newWindow\" href=\"http://stackoverflow.com\">Test target</a></p>\n");
fPage.append("</body>\n");
fPage.append("</html>");
ui->mybrowsertest->setHtml(fPage);
}
}
void mBROWSERQT::resizeMyWindow(const QRect & geom){
qDebug() << "geometry: " << geom;
this->setGeometry(geom);
}
void mBROWSERQT::closeMyWindow(){
qDebug() << "closeMyWindow/webView::stop...";
ui->mybrowsertest->stop();
qDebug() << "closeMyWindow/webView::page::view::close()...";
ui->mybrowsertest->page()->view()->close();
qDebug() << "closeMyWindow/webView::page::view::deleteLater()...";
ui->mybrowsertest->page()->view()->deleteLater();
qDebug() << "closeMyWindow/webView::close()...";
ui->mybrowsertest->close();
qDebug() << "closeMyWindow/MainWindow::close()...";
close();//close widget
deleteLater();//close Object
}
mBROWSERQT::~mBROWSERQT()
{
delete ui;
}
main.cpp
#include "mbrowserqt.h"
#include <QApplication>
#include <QtWebKitWidgets/QWebView>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
mBROWSERQT w;
w.show();
return a.exec();
}

Answer 1

I removed: closeMyWindow
add virtual function: QMainWindow::closeEvent(QCloseEvent *event)
Using QWebFrame::evaluateJavaScript I run a javascript that sends the close command using javascript:
Add attribute QWEBVIEW->setAttribute(Qt::WA_DeleteOnClose, true);
Full fixed source:
mbrowserqt.h
#ifndef mBROWSERQT_H
#define mBROWSERQT_H
#include <QMainWindow>
namespace Ui {
class mBROWSERQT;
}
class mBROWSERQT : public QMainWindow
{
Q_OBJECT
public:
explicit mBROWSERQT(QWidget *parent = 0, bool q = false);
~mBROWSERQT();
private:
Ui::mBROWSERQT *ui;
//adicionado
public slots:
void closeEvent(QCloseEvent *event);
void resizeMyWindow(const QRect & geom);
};
#endif // mBROWSERQT_H
mbrowserqt.cpp
#include "mbrowserqt.h"
#include "ui_mbrowserqt.h"
#include <QtNetwork>
#include <QWebFrame>
QWebSettings *settings;
class myWebPage : public QWebPage
{
bool acceptNavigationRequest(QWebFrame *frame, const QNetworkRequest &request, NavigationType type){
url = request.url();
return QWebPage::acceptNavigationRequest(frame,request,type);
}
virtual QWebPage * createWindow(QWebPage::WebWindowType type) {
Q_UNUSED(type);
QMainWindow *wx = new mBROWSERQT(NULL,true);
QWebView *wv = wx->findChild<QWebView*>("mybrowsertest");
wv->setAttribute(Qt::WA_DeleteOnClose, true);
wx->showNormal();
return wv->page();
}
private:
QUrl url;
};
mBROWSERQT::mBROWSERQT(QWidget *parent, bool q) :
QMainWindow(parent),
ui(new Ui::mBROWSERQT)
{
ui->setupUi(this);
ui->mybrowsertest->setAttribute(Qt::WA_DeleteOnClose, true);
ui->mybrowsertest->setPage(new myWebPage());
settings = QWebSettings::globalSettings();
settings->setAttribute(QWebSettings::LocalContentCanAccessRemoteUrls,true);
settings->setAttribute(QWebSettings::OfflineStorageDatabaseEnabled,true);
settings->setAttribute(QWebSettings::LocalContentCanAccessFileUrls,true);
settings->setAttribute(QWebSettings::JavascriptCanOpenWindows,true);
settings->setAttribute(QWebSettings::JavascriptCanCloseWindows,true);
settings->setAttribute(QWebSettings::JavascriptEnabled,true);
settings->setAttribute(QWebSettings::PluginsEnabled,true);
connect(ui->mybrowsertest->page(), SIGNAL(windowCloseRequested()), this, SLOT(closeMyWindow()));
connect(ui->mybrowsertest->page(), SIGNAL(geometryChangeRequested(const QRect)),
this, SLOT(resizeMyWindow(const QRect)));
qDebug() << "new Page (target or window.open): " << q;
if(q==false){
QString fPage = "<!DOCTYPE html>";
fPage.append("<html>\n");
fPage.append("<head>\n");
fPage.append("<script>\n");
fPage.append("function openWin(q){\n");
fPage.append("try{\n");
fPage.append("var myWindow=window.open('','test','width=200,height=100,top=50,left=50');\n");
fPage.append(" myWindow.document.write(\"<p>This is 'myWindow'</p>\");\n");
fPage.append("} catch (ee){ alert(ee); } }\n");
fPage.append("</script>\n");
fPage.append("</head>\n");
fPage.append("<body>\n");
fPage.append("<p><input type=\"button\" value=\"Test window.open\" onclick=\"openWin();\"></p>\n");
fPage.append("<p><a target=\"newWindow\" href=\"http://stackoverflow.com\">Test target</a></p>\n");
fPage.append("</body>\n");
fPage.append("</html>");
ui->mybrowsertest->setHtml(fPage);
}
}
void mBROWSERQT::resizeMyWindow(const QRect & geom){
qDebug() << "geometry: " << geom;
this->setGeometry(geom);
}
void mBROWSERQT::closeEvent(QCloseEvent *event) {
Q_UNUSED(event);
ui->mybrowsertest->close();
}
mBROWSERQT::~mBROWSERQT()
{
delete ui;
}