1/*
2 * Copyright (C) 2014 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27
28#if ENABLE(ASYNC_SCROLLING)
29
30#import "ScrollingCoordinatorIOS.h"
31
32#include "FrameView.h"
33#include "MainFrame.h"
34#include "Page.h"
35#include "Region.h"
36#include "ScrollingStateTree.h"
37#include "ScrollingThread.h"
38#include "ScrollingTreeFixedNode.h"
39#include "ScrollingTreeFrameScrollingNodeIOS.h"
40#include "ScrollingTreeStickyNode.h"
41#include "ScrollingTreeIOS.h"
42#include <wtf/Functional.h>
43#include <wtf/MainThread.h>
44#include <wtf/PassRefPtr.h>
45
46namespace WebCore {
47
48PassRefPtr<ScrollingCoordinator> ScrollingCoordinator::create(Page* page)
49{
50    return adoptRef(new ScrollingCoordinatorIOS(page));
51}
52
53ScrollingCoordinatorIOS::ScrollingCoordinatorIOS(Page* page)
54    : AsyncScrollingCoordinator(page)
55    , m_scrollingStateTreeCommitterTimer(this, &ScrollingCoordinatorIOS::scrollingStateTreeCommitterTimerFired)
56{
57    setScrollingTree(ScrollingTreeIOS::create(this));
58}
59
60ScrollingCoordinatorIOS::~ScrollingCoordinatorIOS()
61{
62    ASSERT(!scrollingTree());
63}
64
65void ScrollingCoordinatorIOS::pageDestroyed()
66{
67    AsyncScrollingCoordinator::pageDestroyed();
68
69    m_scrollingStateTreeCommitterTimer.stop();
70
71    // Invalidating the scrolling tree will break the reference cycle between the ScrollingCoordinator and ScrollingTree objects.
72    releaseScrollingTree();
73}
74
75void ScrollingCoordinatorIOS::commitTreeStateIfNeeded()
76{
77    if (!scrollingStateTree()->hasChangedProperties())
78        return;
79
80    commitTreeState();
81    m_scrollingStateTreeCommitterTimer.stop();
82}
83
84void ScrollingCoordinatorIOS::scheduleTreeStateCommit()
85{
86    ASSERT(scrollingStateTree()->hasChangedProperties());
87
88    if (m_scrollingStateTreeCommitterTimer.isActive())
89        return;
90
91    m_scrollingStateTreeCommitterTimer.startOneShot(0);
92}
93
94void ScrollingCoordinatorIOS::scrollingStateTreeCommitterTimerFired(Timer<ScrollingCoordinatorIOS>*)
95{
96    commitTreeState();
97}
98
99void ScrollingCoordinatorIOS::commitTreeState()
100{
101    ASSERT(scrollingStateTree()->hasChangedProperties());
102
103    OwnPtr<ScrollingStateTree> treeState = scrollingStateTree()->commit(LayerRepresentation::PlatformLayerRepresentation);
104    // FIXME: figure out how to commit.
105}
106
107
108} // namespace WebCore
109
110#endif // ENABLE(ASYNC_SCROLLING)
111