Screen Orientation API: screen.orientation & orientationchange event

Source/modules/screen_orientation/ScreenOrientationController.cpp

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "config.h"
+#include "modules/screen_orientation/ScreenOrientationController.h"
+
+#include "core/dom/Document.h"
+#include "core/events/Event.h"
+#include "core/frame/DOMWindow.h"
+#include "core/frame/Screen.h"
+#include "modules/screen_orientation/ScreenOrientationDispatcher.h"
+
+namespace WebCore {
+
+ScreenOrientationController::~ScreenOrientationController()
+{
+    ScreenOrientationDispatcher::instance().removeController(this);
+}
+
+ScreenOrientationController* ScreenOrientationController::from(Document* document)
+{
+    ScreenOrientationController* controller = static_cast<ScreenOrientationController*>(DocumentSupplement::from(document, supplementName()));
+    if (!controller) {
+        controller = new ScreenOrientationController(*document);
+        DocumentSupplement::provideTo(document, supplementName(), adoptPtr(controller));
+    }
+    return controller;
+}
+
+ScreenOrientationController::ScreenOrientationController(Document& document)
+    : m_document(document)
+    , m_orientation(blink::WebScreenOrientationPortraitPrimary)
+{
+    // FIXME: We should listen for screen orientation change events only when the page is visible.
+    ScreenOrientationDispatcher::instance().addController(this);
+}
+
+void ScreenOrientationController::dispatchOrientationChangeEvent()
+{
+    if (m_document.domWindow() && m_document.domWindow()->screen()
+        && !m_document.activeDOMObjectsAreSuspended()
+        && !m_document.activeDOMObjectsAreStopped())
+        m_document.domWindow()->screen()->dispatchEvent(Event::create(EventTypeNames::orientationchange));
+}
+
+const char* ScreenOrientationController::supplementName()
+{
+    return "ScreenOrientationController";
+}
+
+void ScreenOrientationController::didChangeScreenOrientation(blink::WebScreenOrientation orientation)
+{
+    if (orientation == m_orientation)
+        return;
+
+    m_orientation = orientation;
+    dispatchOrientationChangeEvent();
+}
+
+} // namespace WebCore