Import QtWebKit public headers.

This is the first step toward re-implementing part of the QWebView
API on top of QtWebEngine. The plan is to import the complete headers
to facilitate diffs and progress tracking.

Changes squashed in this commit:
- Use the QWebEngine prefix for class names
- Strip out non-public members and directives
- Allow building using those headers by disabling the Q_PROPERTY
  macros and by adding a dummy implementation for virtual methods
  directly in the header
- Update the widgetsnanobrowser example to comply with the slight
  changes from the previous API

Change-Id: Ia7efa5430f775d09b493544430a04856cc7928f6
Reviewed-by: Pierre Rossi <pierre.rossi@gmail.com>
Reviewed-by: Andras Becsi <andras.becsi@digia.com>

1 files changed, 38 insertions, 9 deletions

diff --git a/lib/widgets/Api/qwebengineview.cpp b/lib/widgets/Api/qwebengineview.cpp
index 369aa6efa..aea228cc1 100644
--- a/lib/widgets/Api/qwebengineview.cpp
+++ b/lib/widgets/Api/qwebengineview.cpp
@@ -42,16 +42,42 @@
 #include "qwebengineview.h"
 #include "qwebengineview_p.h"
 
+#include "qwebenginepage_p.h"
 #include "render_widget_host_view_qt_delegate_widget.h"
 #include "web_contents_adapter.h"
 
 #include <QStackedLayout>
 #include <QUrl>
 
+void QWebEngineViewPrivate::bind(QWebEngineView *view, QWebEnginePage *page)
+{
+    if (view && page == view->d_func()->page)
+        return;
+
+    if (page) {
+        // Un-bind page from its current view.
+        if (QWebEngineView *oldView = page->d_func()->view) {
+            page->disconnect(oldView);
+            oldView->d_func()->page = 0;
+        }
+        page->d_func()->view = view;
+    }
+
+    if (view) {
+        // Un-bind view from its current page.
+        if (QWebEnginePage *oldPage = view->d_func()->page) {
+            oldPage->disconnect(view);
+            oldPage->d_func()->view = 0;
+        }
+        view->d_func()->page = page;
+    }
+}
+
 QWebEngineViewPrivate::QWebEngineViewPrivate()
     : QWidgetPrivate(QObjectPrivateVersion)
     , m_isLoading(false)
     , adapter(new WebContentsAdapter(this))
+    , page(0)
 {
 }
 
@@ -113,22 +139,25 @@ QWebEngineView::~QWebEngineView()
 {
 }
 
-void QWebEngineView::load(const QUrl& url)
+QWebEnginePage* QWebEngineView::page() const
 {
-    Q_D(QWebEngineView);
-    d->adapter->load(url);
+    Q_D(const QWebEngineView);
+    if (!d->page) {
+        QWebEngineView *that = const_cast<QWebEngineView*>(this);
+        that->setPage(new QWebEnginePage(that));
+    }
+    return d->page;
 }
 
-bool QWebEngineView::canGoBack() const
+void QWebEngineView::setPage(QWebEnginePage* page)
 {
-    Q_D(const QWebEngineView);
-    return d->adapter->canGoBack();
+    QWebEngineViewPrivate::bind(this, page);
 }
 
-bool QWebEngineView::canGoForward() const
+void QWebEngineView::load(const QUrl& url)
 {
-    Q_D(const QWebEngineView);
-    return d->adapter->canGoForward();
+    Q_D(QWebEngineView);
+    d->adapter->load(url);
 }
 
 void QWebEngineView::back()