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
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
|
/*
* Copyright (c) 2020-2021, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/StringBuilder.h>
#include <AK/Utf8View.h>
#include <LibUnicode/Segmentation.h>
#include <LibWeb/DOM/Document.h>
#include <LibWeb/DOM/Position.h>
#include <LibWeb/DOM/Range.h>
#include <LibWeb/DOM/Text.h>
#include <LibWeb/HTML/BrowsingContext.h>
#include <LibWeb/Layout/Viewport.h>
#include <LibWeb/Page/EditEventHandler.h>
namespace Web {
void EditEventHandler::handle_delete_character_after(DOM::Position const& cursor_position)
{
auto& node = *static_cast<DOM::Text*>(const_cast<DOM::Node*>(cursor_position.node()));
auto& text = node.data();
auto next_grapheme_offset = Unicode::next_grapheme_segmentation_boundary(Utf8View { text }, cursor_position.offset());
if (!next_grapheme_offset.has_value()) {
// FIXME: Move to the next node and delete the first character there.
return;
}
StringBuilder builder;
builder.append(text.substring_view(0, cursor_position.offset()));
builder.append(text.substring_view(*next_grapheme_offset));
node.set_data(builder.to_deprecated_string());
// FIXME: When nodes are removed from the DOM, the associated layout nodes become stale and still
// remain in the layout tree. This has to be fixed, this just causes everything to be recomputed
// which really hurts performance.
m_browsing_context->active_document()->force_layout();
m_browsing_context->did_edit({});
}
// This method is quite convoluted but this is necessary to make editing feel intuitive.
void EditEventHandler::handle_delete(DOM::Range& range)
{
auto* start = verify_cast<DOM::Text>(range.start_container());
auto* end = verify_cast<DOM::Text>(range.end_container());
if (start == end) {
StringBuilder builder;
builder.append(start->data().substring_view(0, range.start_offset()));
builder.append(end->data().substring_view(range.end_offset()));
start->set_data(builder.to_deprecated_string());
} else {
// Remove all the nodes that are fully enclosed in the range.
HashTable<DOM::Node*> queued_for_deletion;
for (auto* node = start->next_in_pre_order(); node; node = node->next_in_pre_order()) {
if (node == end)
break;
queued_for_deletion.set(node);
}
for (auto* parent = start->parent(); parent; parent = parent->parent())
queued_for_deletion.remove(parent);
for (auto* parent = end->parent(); parent; parent = parent->parent())
queued_for_deletion.remove(parent);
for (auto* node : queued_for_deletion)
node->remove();
// Join the parent nodes of start and end.
DOM::Node *insert_after = start, *remove_from = end, *parent_of_end = end->parent();
while (remove_from) {
auto* next_sibling = remove_from->next_sibling();
remove_from->remove();
insert_after->parent()->insert_before(*remove_from, *insert_after);
insert_after = remove_from;
remove_from = next_sibling;
}
if (!parent_of_end->has_children()) {
if (parent_of_end->parent())
parent_of_end->remove();
}
// Join the start and end nodes.
StringBuilder builder;
builder.append(start->data().substring_view(0, range.start_offset()));
builder.append(end->data().substring_view(range.end_offset()));
start->set_data(builder.to_deprecated_string());
end->remove();
}
// FIXME: When nodes are removed from the DOM, the associated layout nodes become stale and still
// remain in the layout tree. This has to be fixed, this just causes everything to be recomputed
// which really hurts performance.
m_browsing_context->active_document()->force_layout();
m_browsing_context->did_edit({});
}
void EditEventHandler::handle_insert(DOM::Position position, u32 code_point)
{
if (is<DOM::Text>(*position.node())) {
auto& node = verify_cast<DOM::Text>(*position.node());
StringBuilder builder;
builder.append(node.data().substring_view(0, position.offset()));
builder.append_code_point(code_point);
builder.append(node.data().substring_view(position.offset()));
node.set_data(builder.to_deprecated_string());
node.invalidate_style();
}
// FIXME: When nodes are removed from the DOM, the associated layout nodes become stale and still
// remain in the layout tree. This has to be fixed, this just causes everything to be recomputed
// which really hurts performance.
m_browsing_context->active_document()->force_layout();
m_browsing_context->did_edit({});
}
}
|
