import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

widget/gtk/WidgetUtilsGtk.cpp

@@ -0,0 +1,51 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "WidgetUtilsGtk.h"
+
+namespace mozilla {
+
+namespace widget {
+
+int32_t WidgetUtilsGTK::IsTouchDeviceSupportPresent()
+{
+#if GTK_CHECK_VERSION(3,4,0)
+    int32_t result = 0;
+    GdkDisplay* display = gdk_display_get_default();
+    if (!display) {
+        return 0;
+    }
+
+    GdkDeviceManager* manager = gdk_display_get_device_manager(display);
+    if (!manager) {
+        return 0;
+    }
+
+    GList* devices =
+        gdk_device_manager_list_devices(manager, GDK_DEVICE_TYPE_SLAVE);
+    GList* list = devices;
+
+    while (devices) {
+        GdkDevice* device = static_cast<GdkDevice*>(devices->data);
+        if (gdk_device_get_source(device) == GDK_SOURCE_TOUCHSCREEN) {
+            result = 1;
+            break;
+        }
+        devices = devices->next;
+   }
+
+   if (list) {
+       g_list_free(list);
+   }
+
+   return result;
+#else
+   return 0;
+#endif
+}
+
+}  // namespace widget
+
+} // namespace mozilla