Add touchHandles for widgets

Task-number: QTBUG-100418
Task-number: QTBUG-91712
Change-Id: I69131d3c7c4511ea3114df7a9300bf6ff1a59fee
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>

5 files changed, 122 insertions, 0 deletions

diff --git a/src/webenginewidgets/CMakeLists.txt b/src/webenginewidgets/CMakeLists.txt
index 99a8592ac..b6de53a04 100644
--- a/src/webenginewidgets/CMakeLists.txt
+++ b/src/webenginewidgets/CMakeLists.txt
@@ -13,11 +13,13 @@ qt_internal_add_module(WebEngineWidgets
         api/qwebengineview.cpp api/qwebengineview.h api/qwebengineview_p.h
         qwebengine_accessible.cpp qwebengine_accessible.h
         ui/autofillpopupwidget.cpp ui/autofillpopupwidget_p.h
+        ui/touchhandlewidget.cpp ui/touchhandlewidget_p.h
     DEFINES
         QT_BUILD_WEBENGINEWIDGETS_LIB
     INCLUDE_DIRECTORIES
         ../core
         api
+        ui
     LIBRARIES
         Qt::CorePrivate
         Qt::GuiPrivate
diff --git a/src/webenginewidgets/api/qwebengineview.cpp b/src/webenginewidgets/api/qwebengineview.cpp
index ba82b9573..0e5e9d077 100644
--- a/src/webenginewidgets/api/qwebengineview.cpp
+++ b/src/webenginewidgets/api/qwebengineview.cpp
@@ -8,6 +8,7 @@
 #include "render_widget_host_view_qt_delegate_item.h"
 #include "qwebengine_accessible.h"
 #include "ui/autofillpopupwidget_p.h"
+#include "touchhandlewidget_p.h"
 
 #include <QtWebEngineCore/private/qwebenginepage_p.h>
 #include <QtWebEngineCore/qwebenginecontextmenurequest.h>
@@ -1583,6 +1584,13 @@ bool QContextMenuBuilder::isMenuItemEnabled(ContextMenuItem menuItem)
 }
 #endif // QT_CONFIG(action)
 
+QtWebEngineCore::TouchHandleDrawableDelegate *
+QWebEngineViewPrivate::createTouchHandleDelegate(const QMap<int, QImage> &images)
+{
+    Q_Q(QWebEngineView);
+    return new QtWebEngineWidgetUI::TouchHandleWidget(q, images);
+}
+
 QT_END_NAMESPACE
 
 #include "moc_qwebengineview.cpp"
diff --git a/src/webenginewidgets/api/qwebengineview_p.h b/src/webenginewidgets/api/qwebengineview_p.h
index 7855f9ef3..9e0a40799 100644
--- a/src/webenginewidgets/api/qwebengineview_p.h
+++ b/src/webenginewidgets/api/qwebengineview_p.h
@@ -29,6 +29,7 @@ class RenderWidgetHostViewQtDelegateClient;
 
 namespace QtWebEngineWidgetUI {
 class AutofillPopupWidget;
+class TouchHandleDrawableDelegate;
 }
 
 QT_BEGIN_NAMESPACE
@@ -71,6 +72,8 @@ public:
     void showAutofillPopup(QtWebEngineCore::AutofillPopupController *controller,
                            const QRect &bounds, bool autoselectFirstSuggestion) override;
     void hideAutofillPopup() override;
+    QtWebEngineCore::TouchHandleDrawableDelegate *
+    createTouchHandleDelegate(const QMap<int, QImage> &images) override;
 
     QWebEngineViewPrivate();
     virtual ~QWebEngineViewPrivate();
diff --git a/src/webenginewidgets/ui/touchhandlewidget.cpp b/src/webenginewidgets/ui/touchhandlewidget.cpp
new file mode 100644
index 000000000..88af0ff36
--- /dev/null
+++ b/src/webenginewidgets/ui/touchhandlewidget.cpp
@@ -0,0 +1,59 @@
+// Copyright (C) 2022 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+
+#include "touchhandlewidget_p.h"
+#include "qwebengineview.h"
+
+#include <QBoxLayout>
+#include <QGraphicsOpacityEffect>
+#include <QLabel>
+#include <QWidget>
+
+namespace QtWebEngineWidgetUI {
+TouchHandleWidget::TouchHandleWidget(QWebEngineView *view, const QMap<int, QImage> &images)
+    : m_widget(new QWidget(view))
+    , m_label(new QLabel(m_widget))
+    , m_opacityEffect(new QGraphicsOpacityEffect(m_widget))
+    , m_images(images)
+{
+    m_widget->setAttribute(Qt::WA_AcceptTouchEvents, true);
+    m_widget->setAttribute(Qt::WA_TransparentForMouseEvents, true);
+}
+
+TouchHandleWidget::~TouchHandleWidget()
+{
+}
+
+void TouchHandleWidget::setImage(int orientation)
+{
+    const QImage &img = m_images[orientation];
+    m_label->setPixmap(QPixmap::fromImage(img));
+    m_label->setFrameStyle(QFrame::NoFrame);
+    m_label->resize(img.size());
+    m_label->setVisible(true);
+
+    QVBoxLayout layout;
+    layout.setSpacing(0);
+    layout.setContentsMargins(QMargins());
+    layout.addWidget(m_label);
+    layout.setParent(m_widget);
+    m_widget->setLayout(&layout);
+    m_widget->resize(img.size());
+}
+
+void TouchHandleWidget::setBounds(const QRect &bounds)
+{
+    m_widget->setGeometry(bounds);
+}
+
+void TouchHandleWidget::setVisible(bool visible)
+{
+    m_widget->setVisible(visible);
+}
+
+void TouchHandleWidget::setOpacity(float opacity)
+{
+    m_opacityEffect->setOpacity(opacity);
+    m_widget->setGraphicsEffect(m_opacityEffect);
+}
+} // namespace QtWebEngineWidgetUI
diff --git a/src/webenginewidgets/ui/touchhandlewidget_p.h b/src/webenginewidgets/ui/touchhandlewidget_p.h
new file mode 100644
index 000000000..9f181c935
--- /dev/null
+++ b/src/webenginewidgets/ui/touchhandlewidget_p.h
@@ -0,0 +1,50 @@
+// Copyright (C) 2022 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+
+#ifndef TOUCHHANDLEWIDGET_P_H
+#define TOUCHHANDLEWIDGET_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include "touch_handle_drawable_client.h"
+
+#include <QImage>
+#include <QMap>
+
+QT_BEGIN_NAMESPACE
+class QGraphicsOpacityEffect;
+class QLabel;
+class QWebEngineView;
+class QWidget;
+QT_END_NAMESPACE
+
+namespace QtWebEngineWidgetUI {
+class TouchHandleWidget : public QtWebEngineCore::TouchHandleDrawableDelegate
+{
+public:
+    TouchHandleWidget(QWebEngineView *view, const QMap<int, QImage> &images);
+    ~TouchHandleWidget();
+
+    void setImage(int orientation) override;
+    void setBounds(const QRect &bounds) override;
+    void setVisible(bool visible) override;
+    void setOpacity(float opacity) override;
+
+private:
+    QWidget *m_widget;
+    QLabel *m_label;
+    QGraphicsOpacityEffect *m_opacityEffect;
+    QMap<int, QImage> m_images;
+};
+} // namespace QtWebEngineWidgetUI
+
+#endif // TOUCHHANDLEWIDGET_P_H