Support HTML5 <datalist> element

The datalist uses Chromium's autofill component to fetch and filter
predefined options in the list and autocomplete the field with the
selected option. Autofill component is added to build and bound to
WebEngine. All the unnecessary autofill features for datalist are
supposed to be disabled: payment/credit card support, password manager,
save profile data, store suggestions in database etc.

Custom popups for the dropdown are implemented for Widget and Quick.
Scrolling in dropdown is not implemented in this change.

Fixes: QTBUG-54433
Pick-to: 6.4
Change-Id: I155d02d6dbc9d88fbca4bc5f55b76c19d0ba7a9d
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>

3 files changed, 45 insertions, 0 deletions

diff --git a/src/webenginewidgets/api/qwebengineview.cpp b/src/webenginewidgets/api/qwebengineview.cpp
index 9fa5f11fc..5fdd995b8 100644
--- a/src/webenginewidgets/api/qwebengineview.cpp
+++ b/src/webenginewidgets/api/qwebengineview.cpp
@@ -43,12 +43,15 @@
 #include "render_widget_host_view_qt_delegate_client.h"
 #include "render_widget_host_view_qt_delegate_item.h"
 #include "qwebengine_accessible.h"
+#include "ui/autofillpopupwidget_p.h"
 
 #include <QtWebEngineCore/private/qwebenginepage_p.h>
 #include <QtWebEngineCore/qwebenginecontextmenurequest.h>
 #include <QtWebEngineCore/qwebenginehistory.h>
 #include <QtWebEngineCore/qwebenginehttprequest.h>
 #include <QtWebEngineCore/qwebengineprofile.h>
+
+#include "autofill_popup_controller.h"
 #include "color_chooser_controller.h"
 #include "web_contents_adapter.h"
 
@@ -911,6 +914,34 @@ QWebEngineContextMenuRequest *QWebEngineViewPrivate::lastContextMenuRequest() co
 {
     return m_contextRequest;
 }
+
+void QWebEngineViewPrivate::showAutofillPopup(QtWebEngineCore::AutofillPopupController *controller,
+                                              const QRect &bounds, bool autoselectFirstSuggestion)
+{
+    Q_Q(QWebEngineView);
+    if (!m_autofillPopupWidget)
+        m_autofillPopupWidget.reset(new QtWebEngineWidgetUI::AutofillPopupWidget(controller, q));
+    m_autofillPopupWidget->showPopup(q->mapToGlobal(bounds.bottomLeft()), bounds.width() + 2,
+                                     autoselectFirstSuggestion);
+    controller->notifyPopupShown();
+}
+
+void QWebEngineViewPrivate::hideAutofillPopup()
+{
+    if (!m_autofillPopupWidget)
+        return;
+
+    Q_Q(QWebEngineView);
+    QTimer::singleShot(0, q, [this] {
+        if (m_autofillPopupWidget) {
+            QtWebEngineCore::AutofillPopupController *controller =
+                    m_autofillPopupWidget->m_controller;
+            m_autofillPopupWidget.reset();
+            controller->notifyPopupHidden();
+        }
+    });
+}
+
 /*!
     \fn QWebEngineView::renderProcessTerminated(QWebEnginePage::RenderProcessTerminationStatus terminationStatus, int exitCode)
     \since 5.6
diff --git a/src/webenginewidgets/api/qwebengineview.h b/src/webenginewidgets/api/qwebengineview.h
index cc1495d24..b3dd66f85 100644
--- a/src/webenginewidgets/api/qwebengineview.h
+++ b/src/webenginewidgets/api/qwebengineview.h
@@ -47,6 +47,10 @@
 #include <QtWebEngineWidgets/qtwebenginewidgetsglobal.h>
 #include <QtWebEngineCore/qwebenginepage.h>
 
+namespace QtWebEngineWidgetUI {
+class AutofillPopupWidget;
+}
+
 QT_BEGIN_NAMESPACE
 
 class QContextMenuEvent;
@@ -169,6 +173,7 @@ private:
     Q_DECLARE_PRIVATE(QWebEngineView)
     QScopedPointer<QWebEngineViewPrivate> d_ptr;
 
+    friend class QtWebEngineWidgetUI::AutofillPopupWidget;
     friend class QWebEnginePage;
     friend class QWebEnginePagePrivate;
 #if QT_CONFIG(accessibility)
diff --git a/src/webenginewidgets/api/qwebengineview_p.h b/src/webenginewidgets/api/qwebengineview_p.h
index e3c9468ce..44eb32203 100644
--- a/src/webenginewidgets/api/qwebengineview_p.h
+++ b/src/webenginewidgets/api/qwebengineview_p.h
@@ -56,12 +56,17 @@
 #include "render_view_context_menu_qt.h"
 
 namespace QtWebEngineCore {
+class AutofillPopupController;
 class QWebEngineContextMenuRequest;
 class WebEngineQuickWidget;
 class RenderWidgetHostViewQtDelegate;
 class RenderWidgetHostViewQtDelegateClient;
 }
 
+namespace QtWebEngineWidgetUI {
+class AutofillPopupWidget;
+}
+
 QT_BEGIN_NAMESPACE
 
 class QMenu;
@@ -99,6 +104,9 @@ public:
     void didPrintPage(QPrinter *&printer, QSharedPointer<QByteArray> result) override;
     void didPrintPageToPdf(const QString &filePath, bool success) override;
     void printRequested() override;
+    void showAutofillPopup(QtWebEngineCore::AutofillPopupController *controller,
+                           const QRect &bounds, bool autoselectFirstSuggestion) override;
+    void hideAutofillPopup() override;
 
     QWebEngineViewPrivate();
     virtual ~QWebEngineViewPrivate();
@@ -117,6 +125,7 @@ public:
     bool m_dragEntered;
     mutable bool m_ownsPage;
     QWebEngineContextMenuRequest *m_contextRequest;
+    QScopedPointer<QtWebEngineWidgetUI::AutofillPopupWidget> m_autofillPopupWidget;
 };
 
 class QContextMenuBuilder : public QtWebEngineCore::RenderViewContextMenuQt