1 files changed, 76 insertions, 0 deletions
diff --git a/Source/WebCore/platform/ScrollAnimator.cpp b/Source/WebCore/platform/ScrollAnimator.cpp
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+++ b/Source/WebCore/platform/ScrollAnimator.cpp
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+/*
+ * Copyright (c) 2010, Google Inc. All rights reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * 
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "ScrollAnimator.h"
+
+#include "ScrollbarClient.h"
+#include <algorithm>
+
+namespace WebCore {
+
+#if !ENABLE(SMOOTH_SCROLLING)
+ScrollAnimator* ScrollAnimator::create(ScrollbarClient* client)
+{
+    return new ScrollAnimator(client);
+}
+#endif
+
+ScrollAnimator::ScrollAnimator(ScrollbarClient* client)
+    : m_client(client)
+    , m_currentPosX(0)
+    , m_currentPosY(0)
+{
+}
+
+ScrollAnimator::~ScrollAnimator()
+{
+}
+
+bool ScrollAnimator::scroll(ScrollbarOrientation orientation, ScrollGranularity, float step, float multiplier)
+{
+    float* currentPos = (orientation == HorizontalScrollbar) ? &m_currentPosX : &m_currentPosY;
+    float newPos = std::max(std::min(*currentPos + (step * multiplier), static_cast<float>(m_client->scrollSize(orientation))), 0.0f);
+    if (*currentPos == newPos)
+        return false;
+    *currentPos = newPos;
+    m_client->setScrollOffsetFromAnimation(IntPoint(m_currentPosX, m_currentPosY));
+    return true;
+}
+
+void ScrollAnimator::setScrollPositionAndStopAnimation(ScrollbarOrientation orientation, float pos)
+{
+    if (orientation == HorizontalScrollbar)
+        m_currentPosX = pos;
+    else
+        m_currentPosY = pos;
+}
+
+} // namespace WebCore