Index: Source/core/events/PointerIdManager.cpp |
diff --git a/Source/core/events/PointerIdManager.cpp b/Source/core/events/PointerIdManager.cpp |
new file mode 100644 |
index 0000000000000000000000000000000000000000..09bf74d2410cc9865afd76255e9185e4445ec330 |
--- /dev/null |
+++ b/Source/core/events/PointerIdManager.cpp |
@@ -0,0 +1,52 @@ |
+// Copyright 2015 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 "core/events/PointerIdManager.h" |
+ |
+namespace blink { |
+ |
+PointerIdManager::PointerIdManager() |
+{ |
+ clear(); |
+} |
+ |
+PointerIdManager::~PointerIdManager() |
+{ |
+ clear(); |
+} |
+ |
+void PointerIdManager::clear() |
+{ |
+ for (int type = 0; type < static_cast<int>(PointerTypeLastEntry); type++) { |
+ m_ids[type].clear(); |
+ m_hasPrimaryId[type] = false; |
+ } |
+} |
+ |
+void PointerIdManager::add(PointerType type, unsigned id) |
+{ |
+ if (m_ids[type].isEmpty()) |
+ m_hasPrimaryId[type] = true; |
+ m_ids[type].add(id); |
+} |
+ |
+void PointerIdManager::remove(PointerType type, unsigned id) |
+{ |
+ if (isPrimary(type, id)) { |
+ m_ids[type].removeFirst(); |
+ m_hasPrimaryId[type] = false; |
+ } else { |
+ // Note that simply counting the number of ids instead of storing all of them is not enough. |
+ // When id is absent, remove() should be a no-op. |
+ m_ids[type].remove(id); |
+ } |
+} |
+ |
+bool PointerIdManager::isPrimary(PointerType type, unsigned id) |
+{ |
+ return m_hasPrimaryId[type] && m_ids[type].first() == id; |
+} |
+ |
+} // namespace blink |