Add Pointer Lock support

While the mouse is locked, the cursor is hidden from the user and
mouse events are still generated. The movement which is reported
by the event indicates what would be the position change if the
mouse would not have been locked.

Change-Id: I79b3df5d7d644cd675a27e6c5a0da54e00b69da3
Reviewed-by: Andras Becsi <andras.becsi@theqtcompany.com>

10 files changed, 60 insertions, 3 deletions

diff --git a/src/core/render_widget_host_view_qt.cpp b/src/core/render_widget_host_view_qt.cpp
index fec9caabc..a94ae6995 100644
--- a/src/core/render_widget_host_view_qt.cpp
+++ b/src/core/render_widget_host_view_qt.cpp
@@ -352,12 +352,19 @@ gfx::Rect RenderWidgetHostViewQt::GetViewBounds() const
 // Return value indicates whether the mouse is locked successfully or not.
 bool RenderWidgetHostViewQt::LockMouse()
 {
-    QT_NOT_USED
-    return false;
+    mouse_locked_ = true;
+    m_lockedMousePosition = QCursor::pos();
+    m_delegate->lockMouse();
+    qApp->setOverrideCursor(Qt::BlankCursor);
+    return true;
 }
+
 void RenderWidgetHostViewQt::UnlockMouse()
 {
-    QT_NOT_USED
+    mouse_locked_ = false;
+    m_delegate->unlockMouse();
+    qApp->restoreOverrideCursor();
+    m_host->LostMouseLock();
 }
 
 void RenderWidgetHostViewQt::WasShown()
@@ -833,11 +840,20 @@ void RenderWidgetHostViewQt::handleMouseEvent(QMouseEvent* event)
         m_clickHelper.lastPressPosition = QPointF(event->pos()).toPoint();
     }
 
+    if (IsMouseLocked()) {
+        webEvent.movementX = -(m_lockedMousePosition.x() - event->globalX());
+        webEvent.movementY = -(m_lockedMousePosition.y() - event->globalY());
+        QCursor::setPos(m_lockedMousePosition);
+    }
+
     m_host->ForwardMouseEvent(webEvent);
 }
 
 void RenderWidgetHostViewQt::handleKeyEvent(QKeyEvent *ev)
 {
+    if (IsMouseLocked() && ev->key() == Qt::Key_Escape && ev->type() == QEvent::KeyRelease)
+        UnlockMouse();
+
     content::NativeWebKeyboardEvent webEvent = WebEventFactory::toWebKeyboardEvent(ev);
     m_host->ForwardKeyboardEvent(webEvent);
     if (webEvent.type == blink::WebInputEvent::RawKeyDown && !ev->text().isEmpty()) {
diff --git a/src/core/render_widget_host_view_qt.h b/src/core/render_widget_host_view_qt.h
index fdb43dcae..6ba95213b 100644
--- a/src/core/render_widget_host_view_qt.h
+++ b/src/core/render_widget_host_view_qt.h
@@ -248,6 +248,7 @@ private:
     QRect m_cursorRect;
     size_t m_anchorPositionWithinSelection;
     size_t m_cursorPositionWithinSelection;
+    QPoint m_lockedMousePosition;
 
     bool m_initPending;
 };
diff --git a/src/core/render_widget_host_view_qt_delegate.h b/src/core/render_widget_host_view_qt_delegate.h
index 0fb3d1d5f..018a914d8 100644
--- a/src/core/render_widget_host_view_qt_delegate.h
+++ b/src/core/render_widget_host_view_qt_delegate.h
@@ -77,6 +77,8 @@ public:
     virtual QRectF contentsRect() const = 0;
     virtual void setKeyboardFocus() = 0;
     virtual bool hasKeyboardFocus() = 0;
+    virtual void lockMouse() = 0;
+    virtual void unlockMouse() = 0;
     virtual void show() = 0;
     virtual void hide() = 0;
     virtual bool isVisible() const = 0;
diff --git a/src/core/web_contents_delegate_qt.cpp b/src/core/web_contents_delegate_qt.cpp
index 9d53dc48d..f55300571 100644
--- a/src/core/web_contents_delegate_qt.cpp
+++ b/src/core/web_contents_delegate_qt.cpp
@@ -275,6 +275,17 @@ void WebContentsDelegateQt::DidNavigateAnyFrame(const content::LoadCommittedDeta
     m_viewClient->browserContextAdapter()->visitedLinksManager()->addUrl(params.url);
 }
 
+void WebContentsDelegateQt::RequestToLockMouse(content::WebContents *web_contents, bool user_gesture, bool last_unlocked_by_target)
+{
+    Q_UNUSED(user_gesture);
+
+    if (last_unlocked_by_target)
+        web_contents->GotResponseToLockMouseRequest(true);
+    else
+        // TODO: Send permission request
+        web_contents->GotResponseToLockMouseRequest(true);
+}
+
 void WebContentsDelegateQt::overrideWebPreferences(content::WebContents *, WebPreferences *webPreferences)
 {
     m_viewClient->webEngineSettings()->overrideWebPreferences(webPreferences);
diff --git a/src/core/web_contents_delegate_qt.h b/src/core/web_contents_delegate_qt.h
index 29a548f47..aa97b52cc 100644
--- a/src/core/web_contents_delegate_qt.h
+++ b/src/core/web_contents_delegate_qt.h
@@ -87,6 +87,7 @@ public:
     virtual void RequestMediaAccessPermission(content::WebContents* web_contents, const content::MediaStreamRequest& request, const content::MediaResponseCallback& callback) Q_DECL_OVERRIDE;
     virtual void UpdateTargetURL(content::WebContents *source, int32 page_id, const GURL &url) Q_DECL_OVERRIDE;
     virtual void DidNavigateAnyFrame(const content::LoadCommittedDetails&, const content::FrameNavigateParams& params) Q_DECL_OVERRIDE;
+    virtual void RequestToLockMouse(content::WebContents *web_contents, bool user_gesture, bool last_unlocked_by_target) Q_DECL_OVERRIDE;
 
     void overrideWebPreferences(content::WebContents *, WebPreferences*);
     void allowCertificateError(const QExplicitlySharedDataPointer<CertificateErrorController> &) ;
diff --git a/src/webengine/render_widget_host_view_qt_delegate_quick.cpp b/src/webengine/render_widget_host_view_qt_delegate_quick.cpp
index 92aabac8e..663232eda 100644
--- a/src/webengine/render_widget_host_view_qt_delegate_quick.cpp
+++ b/src/webengine/render_widget_host_view_qt_delegate_quick.cpp
@@ -105,6 +105,16 @@ bool RenderWidgetHostViewQtDelegateQuick::hasKeyboardFocus()
     return hasFocus();
 }
 
+void RenderWidgetHostViewQtDelegateQuick::lockMouse()
+{
+    grabMouse();
+}
+
+void RenderWidgetHostViewQtDelegateQuick::unlockMouse()
+{
+    ungrabMouse();
+}
+
 void RenderWidgetHostViewQtDelegateQuick::show()
 {
     setVisible(true);
diff --git a/src/webengine/render_widget_host_view_qt_delegate_quick.h b/src/webengine/render_widget_host_view_qt_delegate_quick.h
index 112d97377..305c14957 100644
--- a/src/webengine/render_widget_host_view_qt_delegate_quick.h
+++ b/src/webengine/render_widget_host_view_qt_delegate_quick.h
@@ -53,6 +53,8 @@ public:
     virtual QRectF contentsRect() const Q_DECL_OVERRIDE;
     virtual void setKeyboardFocus() Q_DECL_OVERRIDE;
     virtual bool hasKeyboardFocus() Q_DECL_OVERRIDE;
+    virtual void lockMouse() Q_DECL_OVERRIDE;
+    virtual void unlockMouse() Q_DECL_OVERRIDE;
     virtual void show() Q_DECL_OVERRIDE;
     virtual void hide() Q_DECL_OVERRIDE;
     virtual bool isVisible() const Q_DECL_OVERRIDE;
diff --git a/src/webengine/render_widget_host_view_qt_delegate_quickwindow.h b/src/webengine/render_widget_host_view_qt_delegate_quickwindow.h
index e6c793143..d3e81e497 100644
--- a/src/webengine/render_widget_host_view_qt_delegate_quickwindow.h
+++ b/src/webengine/render_widget_host_view_qt_delegate_quickwindow.h
@@ -56,6 +56,8 @@ public:
     virtual QRectF contentsRect() const Q_DECL_OVERRIDE;
     virtual void setKeyboardFocus() Q_DECL_OVERRIDE {}
     virtual bool hasKeyboardFocus() Q_DECL_OVERRIDE { return false; }
+    virtual void lockMouse() Q_DECL_OVERRIDE {}
+    virtual void unlockMouse() Q_DECL_OVERRIDE {}
     virtual void show() Q_DECL_OVERRIDE;
     virtual void hide() Q_DECL_OVERRIDE;
     virtual bool isVisible() const Q_DECL_OVERRIDE;
diff --git a/src/webenginewidgets/render_widget_host_view_qt_delegate_widget.cpp b/src/webenginewidgets/render_widget_host_view_qt_delegate_widget.cpp
index e49259a59..3880e4197 100644
--- a/src/webenginewidgets/render_widget_host_view_qt_delegate_widget.cpp
+++ b/src/webenginewidgets/render_widget_host_view_qt_delegate_widget.cpp
@@ -121,6 +121,16 @@ bool RenderWidgetHostViewQtDelegateWidget::hasKeyboardFocus()
     return hasFocus();
 }
 
+void RenderWidgetHostViewQtDelegateWidget::lockMouse()
+{
+    grabMouse();
+}
+
+void RenderWidgetHostViewQtDelegateWidget::unlockMouse()
+{
+    releaseMouse();
+}
+
 void RenderWidgetHostViewQtDelegateWidget::show()
 {
     // Check if we're attached to a QWebEngineView, we don't
diff --git a/src/webenginewidgets/render_widget_host_view_qt_delegate_widget.h b/src/webenginewidgets/render_widget_host_view_qt_delegate_widget.h
index 670e22f31..8fc189124 100644
--- a/src/webenginewidgets/render_widget_host_view_qt_delegate_widget.h
+++ b/src/webenginewidgets/render_widget_host_view_qt_delegate_widget.h
@@ -61,6 +61,8 @@ public:
     virtual QRectF contentsRect() const Q_DECL_OVERRIDE;
     virtual void setKeyboardFocus() Q_DECL_OVERRIDE;
     virtual bool hasKeyboardFocus() Q_DECL_OVERRIDE;
+    virtual void lockMouse() Q_DECL_OVERRIDE;
+    virtual void unlockMouse() Q_DECL_OVERRIDE;
     virtual void show() Q_DECL_OVERRIDE;
     virtual void hide() Q_DECL_OVERRIDE;
     virtual bool isVisible() const Q_DECL_OVERRIDE;