1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
|
/*
* 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 "third_party/blink/renderer/platform/scroll/scroll_animator_base.h"
#include "third_party/blink/renderer/platform/scroll/scrollable_area.h"
#include "third_party/blink/renderer/platform/wtf/math_extras.h"
namespace blink {
ScrollAnimatorBase::ScrollAnimatorBase(ScrollableArea* scrollable_area)
: scrollable_area_(scrollable_area) {}
ScrollAnimatorBase::~ScrollAnimatorBase() = default;
ScrollOffset ScrollAnimatorBase::ComputeDeltaToConsume(
const ScrollOffset& delta) const {
ScrollOffset new_pos =
scrollable_area_->ClampScrollOffset(current_offset_ + delta);
return new_pos - current_offset_;
}
ScrollResult ScrollAnimatorBase::UserScroll(ScrollGranularity,
const ScrollOffset& delta) {
ScrollOffset consumed_delta = ComputeDeltaToConsume(delta);
ScrollOffset new_pos = current_offset_ + consumed_delta;
if (current_offset_ == new_pos)
return ScrollResult(false, false, delta.Width(), delta.Height());
current_offset_ = new_pos;
NotifyOffsetChanged();
return ScrollResult(consumed_delta.Width(), consumed_delta.Height(),
delta.Width() - consumed_delta.Width(),
delta.Height() - consumed_delta.Height());
}
void ScrollAnimatorBase::ScrollToOffsetWithoutAnimation(
const ScrollOffset& offset) {
current_offset_ = offset;
NotifyOffsetChanged();
}
void ScrollAnimatorBase::SetCurrentOffset(const ScrollOffset& offset) {
current_offset_ = offset;
}
ScrollOffset ScrollAnimatorBase::CurrentOffset() const {
return current_offset_;
}
void ScrollAnimatorBase::NotifyOffsetChanged() {
ScrollOffsetChanged(current_offset_, kUserScroll);
}
void ScrollAnimatorBase::Trace(blink::Visitor* visitor) {
visitor->Trace(scrollable_area_);
ScrollAnimatorCompositorCoordinator::Trace(visitor);
}
} // namespace blink
|
