Implement QWebEnginePage::toHtml and toPlainText

Those methods are now made asynchronous and need to be given a
callback to handle the result.

Update the code in the browser and fancybrowser examples using
std::bind when using C++11 or tr1::bind with C++03 (which should be
available with compilers on platforms that we support).

Add a (currently failing) earlyToHtml test to make sure that an empty
page doesn't crash because of a possibly incomplete attachment of
the QtRenderViewObserver.

Change-Id: I3ab7cb6f25b91b584dd80df5e4e9ad1e3214348e
Reviewed-by: Pierre Rossi <pierre.rossi@gmail.com>

2 files changed, 25 insertions, 13 deletions

diff --git a/examples/widgets/browser/browsermainwindow.cpp b/examples/widgets/browser/browsermainwindow.cpp
index 9a2262314..ac8426d9a 100644
--- a/examples/widgets/browser/browsermainwindow.cpp
+++ b/examples/widgets/browser/browsermainwindow.cpp
@@ -71,6 +71,16 @@
 
 #include <QtCore/QDebug>
 
+#if __cplusplus >= 201103L
+#include <functional>
+using std::bind;
+namespace placeholders = std::placeholders;
+#else
+#include <tr1/functional>
+using std::tr1::bind;
+namespace placeholders = std::tr1::placeholders;
+#endif
+
 BrowserMainWindow::BrowserMainWindow(QWidget *parent, Qt::WindowFlags flags)
     : QMainWindow(parent, flags)
     , m_tabWidget(new TabWidget(this))
@@ -372,9 +382,7 @@ void BrowserMainWindow::setupMenu()
 #endif
 
     viewMenu->addSeparator();
-#if defined(QWEBENGINEPAGE_TOHTML)
     viewMenu->addAction(tr("Page S&ource"), this, SLOT(slotViewPageSource()), tr("Ctrl+Alt+U"));
-#endif
     QAction *a = viewMenu->addAction(tr("&Full Screen"), this, SLOT(slotViewFullScreen(bool)),  Qt::Key_F11);
     a->setCheckable(true);
 
@@ -810,17 +818,16 @@ void BrowserMainWindow::slotViewFullScreen(bool makeFullScreen)
 
 void BrowserMainWindow::slotViewPageSource()
 {
-#if defined(QWEBENGINEPAGE_TOHTML)
     if (!currentTab())
         return;
 
-    QString markup = currentTab()->page()->toHtml();
-    QPlainTextEdit *view = new QPlainTextEdit(markup);
+    QPlainTextEdit *view = new QPlainTextEdit;
     view->setWindowTitle(tr("Page Source of %1").arg(currentTab()->title()));
     view->setMinimumWidth(640);
     view->setAttribute(Qt::WA_DeleteOnClose);
     view->show();
-#endif
+
+    currentTab()->page()->toHtml(bind(&QPlainTextEdit::setPlainText, view, placeholders::_1));
 }
 
 void BrowserMainWindow::slotHome()
diff --git a/examples/widgets/fancybrowser/mainwindow.cpp b/examples/widgets/fancybrowser/mainwindow.cpp
index 53b2a545d..b9d5a8364 100644
--- a/examples/widgets/fancybrowser/mainwindow.cpp
+++ b/examples/widgets/fancybrowser/mainwindow.cpp
@@ -42,6 +42,16 @@
 #include <QtWebEngineWidgets>
 #include "mainwindow.h"
 
+#if __cplusplus >= 201103L
+#include <functional>
+using std::bind;
+namespace placeholders = std::placeholders;
+#else
+#include <tr1/functional>
+using std::tr1::bind;
+namespace placeholders = std::tr1::placeholders;
+#endif
+
 //! [1]
 
 MainWindow::MainWindow(const QUrl& url)
@@ -75,12 +85,10 @@ MainWindow::MainWindow(const QUrl& url)
     toolBar->addWidget(locationEdit);
 //! [1]
 
-#ifdef QWEBENGINEPAGE_TOHTML
     QMenu *viewMenu = menuBar()->addMenu(tr("&View"));
     QAction* viewSourceAction = new QAction("Page Source", this);
     connect(viewSourceAction, SIGNAL(triggered()), SLOT(viewSource()));
     viewMenu->addAction(viewSourceAction);
-#endif
 
 //! [3]
     QMenu *effectMenu = menuBar()->addMenu(tr("&Effect"));
@@ -106,16 +114,13 @@ MainWindow::MainWindow(const QUrl& url)
 
 void MainWindow::viewSource()
 {
-#ifdef QWEBENGINEPAGE_TOHTML
-    QWebEnginePage *mainFrame = view->page();
     QTextEdit* textEdit = new QTextEdit(NULL);
     textEdit->setAttribute(Qt::WA_DeleteOnClose);
     textEdit->adjustSize();
     textEdit->move(this->geometry().center() - textEdit->rect().center());
-
-    textEdit->setPlainText(mainFrame->toHtml());
     textEdit->show();
-#endif
+
+    view->page()->toHtml(bind(&QTextEdit::setPlainText, textEdit, placeholders::_1));
 }
 
 //! [4]