1 files changed, 93 insertions, 0 deletions
diff --git a/layout/xul/nsRepeatService.cpp b/layout/xul/nsRepeatService.cpp
new file mode 100644
index 0000000000..b23c17396e
--- /dev/null
+++ b/layout/xul/nsRepeatService.cpp
@@ -0,0 +1,93 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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/. */
+
+//
+// Eric Vaughan
+// Netscape Communications
+//
+// See documentation in associated header file
+//
+
+#include "nsRepeatService.h"
+#include "mozilla/StaticPtr.h"
+#include "mozilla/dom/Document.h"
+
+using namespace mozilla;
+
+static StaticAutoPtr<nsRepeatService> gRepeatService;
+
+nsRepeatService::nsRepeatService()
+    : mCallback(nullptr), mCallbackData(nullptr) {}
+
+nsRepeatService::~nsRepeatService() {
+  NS_ASSERTION(!mCallback && !mCallbackData,
+               "Callback was not removed before shutdown");
+}
+
+/* static */
+nsRepeatService* nsRepeatService::GetInstance() {
+  if (!gRepeatService) {
+    gRepeatService = new nsRepeatService();
+  }
+  return gRepeatService;
+}
+
+/*static*/
+void nsRepeatService::Shutdown() { gRepeatService = nullptr; }
+
+void nsRepeatService::Start(Callback aCallback, void* aCallbackData,
+                            dom::Document* aDocument,
+                            const nsACString& aCallbackName,
+                            uint32_t aInitialDelay) {
+  MOZ_ASSERT(aCallback != nullptr, "null ptr");
+
+  mCallback = aCallback;
+  mCallbackData = aCallbackData;
+  mCallbackName = aCallbackName;
+
+  mRepeatTimer = NS_NewTimer(aDocument->EventTargetFor(TaskCategory::Other));
+
+  if (mRepeatTimer) {
+    InitTimerCallback(aInitialDelay);
+  }
+}
+
+void nsRepeatService::Stop(Callback aCallback, void* aCallbackData) {
+  if (mCallback != aCallback || mCallbackData != aCallbackData) return;
+
+  // printf("Stopping repeat timer\n");
+  if (mRepeatTimer) {
+    mRepeatTimer->Cancel();
+    mRepeatTimer = nullptr;
+  }
+  mCallback = nullptr;
+  mCallbackData = nullptr;
+}
+
+void nsRepeatService::InitTimerCallback(uint32_t aInitialDelay) {
+  if (!mRepeatTimer) {
+    return;
+  }
+
+  mRepeatTimer->InitWithNamedFuncCallback(
+      [](nsITimer* aTimer, void* aClosure) {
+        // Use gRepeatService instead of nsRepeatService::GetInstance() (because
+        // we don't want nsRepeatService::GetInstance() to re-create a new
+        // instance for us, if we happen to get invoked after
+        // nsRepeatService::Shutdown() has nulled out gRepeatService).
+        nsRepeatService* rs = gRepeatService;
+        if (!rs) {
+          return;
+        }
+
+        if (rs->mCallback) {
+          rs->mCallback(rs->mCallbackData);
+        }
+
+        rs->InitTimerCallback(REPEAT_DELAY);
+      },
+      nullptr, aInitialDelay, nsITimer::TYPE_ONE_SHOT, mCallbackName.Data());
+}