Moving GraphicsContext and dependencies from core to platform.

Source/core/platform/ScrollAnimator.cpp

-/*
- * 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 "core/platform/ScrollAnimator.h"
-
-#include "core/platform/ScrollableArea.h"
-#include "platform/geometry/FloatPoint.h"
-#include "wtf/PassOwnPtr.h"
-#include <algorithm>
-
-using namespace std;
-
-namespace WebCore {
-
-ScrollAnimator::ScrollAnimator(ScrollableArea* scrollableArea)
-    : m_scrollableArea(scrollableArea)
-    , 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 = clampScrollPosition(orientation, *currentPos + step * multiplier);
-    float delta = *currentPos - newPos;
-    if (*currentPos == newPos)
-        return false;
-    *currentPos = newPos;
-
-    notifyPositionChanged(orientation == HorizontalScrollbar ? FloatSize(delta, 0) : FloatSize(0, delta));
-
-    return true;
-}
-
-void ScrollAnimator::scrollToOffsetWithoutAnimation(const FloatPoint& offset)
-{
-    FloatSize delta = FloatSize(offset.x() - m_currentPosX, offset.y() - m_currentPosY);
-    m_currentPosX = offset.x();
-    m_currentPosY = offset.y();
-    notifyPositionChanged(delta);
-}
-
-bool ScrollAnimator::handleWheelEvent(const PlatformWheelEvent& e)
-{
-    bool canScrollX = m_scrollableArea->userInputScrollable(HorizontalScrollbar);
-    bool canScrollY = m_scrollableArea->userInputScrollable(VerticalScrollbar);
-
-    // Accept the event if we are scrollable in that direction and can still
-    // scroll any further.
-    float deltaX = canScrollX ? e.deltaX() : 0;
-    float deltaY = canScrollY ? e.deltaY() : 0;
-
-    bool handled = false;
-
-#if !OS(MACOSX)
-    ScrollGranularity granularity = e.hasPreciseScrollingDeltas() ? ScrollByPrecisePixel : ScrollByPixel;
-#else
-    ScrollGranularity granularity = ScrollByPixel;
-#endif
-
-    IntSize maxForwardScrollDelta = m_scrollableArea->maximumScrollPosition() - m_scrollableArea->scrollPosition();
-    IntSize maxBackwardScrollDelta = m_scrollableArea->scrollPosition() - m_scrollableArea->minimumScrollPosition();
-    if ((deltaX < 0 && maxForwardScrollDelta.width() > 0)
-        || (deltaX > 0 && maxBackwardScrollDelta.width() > 0)
-        || (deltaY < 0 && maxForwardScrollDelta.height() > 0)
-        || (deltaY > 0 && maxBackwardScrollDelta.height() > 0)) {
-        handled = true;
-
-        if (deltaY) {
-            if (e.granularity() == ScrollByPageWheelEvent) {
-                bool negative = deltaY < 0;
-                deltaY = m_scrollableArea->pageStep(VerticalScrollbar);
-                if (negative)
-                    deltaY = -deltaY;
-            }
-
-            scroll(VerticalScrollbar, granularity, m_scrollableArea->pixelStep(VerticalScrollbar), -deltaY);
-        }
-
-        if (deltaX) {
-            if (e.granularity() == ScrollByPageWheelEvent) {
-                bool negative = deltaX < 0;
-                deltaX = m_scrollableArea->pageStep(HorizontalScrollbar);
-                if (negative)
-                    deltaX = -deltaX;
-            }
-
-            scroll(HorizontalScrollbar, granularity, m_scrollableArea->pixelStep(HorizontalScrollbar), -deltaX);
-        }
-    }
-    return handled;
-}
-
-void ScrollAnimator::setCurrentPosition(const FloatPoint& position)
-{
-    m_currentPosX = position.x();
-    m_currentPosY = position.y();
-}
-
-FloatPoint ScrollAnimator::currentPosition() const
-{
-    return FloatPoint(m_currentPosX, m_currentPosY);
-}
-
-void ScrollAnimator::notifyPositionChanged(const FloatSize& delta)
-{
-    UNUSED_PARAM(delta);
-    m_scrollableArea->setScrollOffsetFromAnimation(IntPoint(m_currentPosX, m_currentPosY));
-}
-
-float ScrollAnimator::clampScrollPosition(ScrollbarOrientation orientation, float pos)
-{
-    float maxScrollPos = m_scrollableArea->maximumScrollPosition(orientation);
-    float minScrollPos = m_scrollableArea->minimumScrollPosition(orientation);
-    return std::max(std::min(pos, maxScrollPos), minScrollPos);
-}
-
-} // namespace WebCore