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1 // Copyright 2016 The Chromium Authors. All rights reserved. | 1 // Copyright 2016 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "core/input/ScrollManager.h" | 5 #include "core/input/ScrollManager.h" |
6 | 6 |
7 #include <memory> | 7 #include <memory> |
8 #include "core/dom/DOMNodeIds.h" | 8 #include "core/dom/DOMNodeIds.h" |
9 #include "core/dom/NodeComputedStyle.h" | |
9 #include "core/events/GestureEvent.h" | 10 #include "core/events/GestureEvent.h" |
10 #include "core/frame/BrowserControls.h" | 11 #include "core/frame/BrowserControls.h" |
11 #include "core/frame/LocalFrameView.h" | 12 #include "core/frame/LocalFrameView.h" |
12 #include "core/html/HTMLFrameOwnerElement.h" | 13 #include "core/html/HTMLFrameOwnerElement.h" |
13 #include "core/input/EventHandler.h" | 14 #include "core/input/EventHandler.h" |
14 #include "core/input/EventHandlingUtil.h" | 15 #include "core/input/EventHandlingUtil.h" |
15 #include "core/layout/LayoutBlock.h" | 16 #include "core/layout/LayoutBlock.h" |
16 #include "core/layout/LayoutEmbeddedContent.h" | 17 #include "core/layout/LayoutEmbeddedContent.h" |
17 #include "core/layout/api/LayoutViewItem.h" | 18 #include "core/layout/api/LayoutViewItem.h" |
18 #include "core/loader/DocumentLoader.h" | 19 #include "core/loader/DocumentLoader.h" |
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110 // that'll be the document node rather than the element. | 111 // that'll be the document node rather than the element. |
111 cur_element = document_element; | 112 cur_element = document_element; |
112 } | 113 } |
113 | 114 |
114 if (cur_element) { | 115 if (cur_element) { |
115 if (CanScroll(scroll_state, *cur_element)) | 116 if (CanScroll(scroll_state, *cur_element)) |
116 scroll_chain.push_front(DOMNodeIds::IdForNode(cur_element)); | 117 scroll_chain.push_front(DOMNodeIds::IdForNode(cur_element)); |
117 if (IsViewportScrollingElement(*cur_element) || | 118 if (IsViewportScrollingElement(*cur_element) || |
118 cur_element == document_element) | 119 cur_element == document_element) |
119 break; | 120 break; |
121 | |
122 if (!CanPropagate(scroll_state, *cur_element)) | |
123 break; | |
120 } | 124 } |
121 | 125 |
122 cur_box = cur_box->ContainingBlock(); | 126 cur_box = cur_box->ContainingBlock(); |
123 } | 127 } |
124 } | 128 } |
125 | 129 |
126 bool ScrollManager::CanScroll(const ScrollState& scroll_state, | 130 bool ScrollManager::CanScroll(const ScrollState& scroll_state, |
127 const Element& current_element) { | 131 const Element& current_element) { |
128 const double delta_x = scroll_state.isBeginning() ? scroll_state.deltaXHint() | 132 const double delta_x = scroll_state.isBeginning() ? scroll_state.deltaXHint() |
129 : scroll_state.deltaX(); | 133 : scroll_state.deltaX(); |
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145 if (!scrollable_area) | 149 if (!scrollable_area) |
146 return false; | 150 return false; |
147 | 151 |
148 ScrollOffset current_offset = scrollable_area->GetScrollOffset(); | 152 ScrollOffset current_offset = scrollable_area->GetScrollOffset(); |
149 ScrollOffset target_offset = current_offset + ScrollOffset(delta_x, delta_y); | 153 ScrollOffset target_offset = current_offset + ScrollOffset(delta_x, delta_y); |
150 ScrollOffset clamped_offset = | 154 ScrollOffset clamped_offset = |
151 scrollable_area->ClampScrollOffset(target_offset); | 155 scrollable_area->ClampScrollOffset(target_offset); |
152 return clamped_offset != current_offset; | 156 return clamped_offset != current_offset; |
153 } | 157 } |
154 | 158 |
159 bool ScrollManager::CanPropagate(const ScrollState& scroll_state, | |
160 const Element& current_element) { | |
majidvp
2017/07/14 14:29:44
ditto. This function does not need to be a member
sunyunjia
2017/07/14 22:07:24
Done.
| |
161 // ScrollBoundaryBehavior may have different values on x-axis and y-axis. | |
162 // We need to find out the dominant axis of user's intended scroll to decide | |
163 // which ScrollBoundaryBehavior should be applied, i.e. which node should | |
164 // be scrolled. | |
majidvp
2017/07/14 14:29:44
ditto. the last sentence of the comment is not acc
sunyunjia
2017/07/14 22:07:24
Done.
| |
165 bool x_dominant = | |
166 std::abs(scroll_state.deltaXHint()) > std::abs(scroll_state.deltaYHint()); | |
167 return (x_dominant && | |
168 current_element.GetComputedStyle()->ScrollBoundaryBehaviorX() == | |
169 EScrollBoundaryBehavior::kAuto) || | |
170 (!x_dominant && | |
171 current_element.GetComputedStyle()->ScrollBoundaryBehaviorY() == | |
172 EScrollBoundaryBehavior::kAuto); | |
173 } | |
174 | |
155 bool ScrollManager::LogicalScroll(ScrollDirection direction, | 175 bool ScrollManager::LogicalScroll(ScrollDirection direction, |
156 ScrollGranularity granularity, | 176 ScrollGranularity granularity, |
157 Node* start_node, | 177 Node* start_node, |
158 Node* mouse_press_node) { | 178 Node* mouse_press_node) { |
159 Node* node = start_node; | 179 Node* node = start_node; |
160 | 180 |
161 if (!node) | 181 if (!node) |
162 node = frame_->GetDocument()->FocusedElement(); | 182 node = frame_->GetDocument()->FocusedElement(); |
163 | 183 |
164 if (!node) | 184 if (!node) |
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706 &should_update_capture)) { | 726 &should_update_capture)) { |
707 if (should_update_capture) | 727 if (should_update_capture) |
708 scrollbar_handling_scroll_gesture_ = scrollbar; | 728 scrollbar_handling_scroll_gesture_ = scrollbar; |
709 return true; | 729 return true; |
710 } | 730 } |
711 } | 731 } |
712 return false; | 732 return false; |
713 } | 733 } |
714 | 734 |
715 } // namespace blink | 735 } // namespace blink |
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