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
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
|
/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2021, Sam Atkins <atkinssj@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibGfx/Painter.h>
#include <LibWeb/DOM/Document.h>
#include <LibWeb/HTML/HTMLBodyElement.h>
#include <LibWeb/HTML/HTMLHtmlElement.h>
#include <LibWeb/Layout/BlockContainer.h>
#include <LibWeb/Layout/Box.h>
#include <LibWeb/Layout/FormattingContext.h>
#include <LibWeb/Page/BrowsingContext.h>
#include <LibWeb/Painting/BackgroundPainting.h>
#include <LibWeb/Painting/BorderPainting.h>
#include <LibWeb/Painting/ShadowPainting.h>
namespace Web::Layout {
void Box::paint(PaintContext& context, PaintPhase phase)
{
if (!is_visible())
return;
if (phase == PaintPhase::Background) {
paint_background(context);
paint_box_shadow(context);
}
if (phase == PaintPhase::Border) {
paint_border(context);
}
if (phase == PaintPhase::Overlay && dom_node() && document().inspected_node() == dom_node()) {
auto content_rect = absolute_rect();
auto margin_box = box_model().margin_box();
Gfx::FloatRect margin_rect;
margin_rect.set_x(absolute_x() - margin_box.left);
margin_rect.set_width(width() + margin_box.left + margin_box.right);
margin_rect.set_y(absolute_y() - margin_box.top);
margin_rect.set_height(height() + margin_box.top + margin_box.bottom);
context.painter().draw_rect(enclosing_int_rect(margin_rect), Color::Yellow);
context.painter().draw_rect(enclosing_int_rect(padded_rect()), Color::Cyan);
context.painter().draw_rect(enclosing_int_rect(content_rect), Color::Magenta);
}
if (phase == PaintPhase::FocusOutline && dom_node() && dom_node()->is_element() && verify_cast<DOM::Element>(*dom_node()).is_focused()) {
context.painter().draw_rect(enclosing_int_rect(absolute_rect()), context.palette().focus_outline());
}
}
void Box::paint_border(PaintContext& context)
{
auto borders_data = Painting::BordersData {
.top = computed_values().border_top(),
.right = computed_values().border_right(),
.bottom = computed_values().border_bottom(),
.left = computed_values().border_left(),
};
Painting::paint_all_borders(context, bordered_rect(), normalized_border_radius_data(), borders_data);
}
void Box::paint_background(PaintContext& context)
{
// If the body's background properties were propagated to the root element, do no re-paint the body's background.
if (is_body() && document().html_element()->should_use_body_background_properties())
return;
Gfx::IntRect background_rect;
Color background_color = computed_values().background_color();
auto* background_layers = &computed_values().background_layers();
if (is_root_element()) {
// CSS 2.1 Appendix E.2: If the element is a root element, paint the background over the entire canvas.
background_rect = context.viewport_rect();
// Section 2.11.2: If the computed value of background-image on the root element is none and its background-color is transparent,
// user agents must instead propagate the computed values of the background properties from that element’s first HTML BODY child element.
if (document().html_element()->should_use_body_background_properties()) {
background_layers = document().background_layers();
background_color = document().background_color(context.palette());
}
} else {
background_rect = enclosing_int_rect(padded_rect());
}
// HACK: If the Box has a border, use the bordered_rect to paint the background.
// This way if we have a border-radius there will be no gap between the filling and actual border.
if (computed_values().border_top().width || computed_values().border_right().width || computed_values().border_bottom().width || computed_values().border_left().width)
background_rect = enclosing_int_rect(bordered_rect());
Painting::paint_background(context, background_rect, background_color, background_layers, normalized_border_radius_data());
}
void Box::paint_box_shadow(PaintContext& context)
{
auto box_shadow_data = computed_values().box_shadow();
if (!box_shadow_data.has_value())
return;
auto resolved_box_shadow_data = Painting::BoxShadowData {
.offset_x = (int)box_shadow_data->offset_x.resolved_or_zero(*this, width()).to_px(*this),
.offset_y = (int)box_shadow_data->offset_y.resolved_or_zero(*this, width()).to_px(*this),
.blur_radius = (int)box_shadow_data->blur_radius.resolved_or_zero(*this, width()).to_px(*this),
.color = box_shadow_data->color
};
Painting::paint_box_shadow(context, enclosing_int_rect(bordered_rect()), resolved_box_shadow_data);
}
Painting::BorderRadiusData Box::normalized_border_radius_data()
{
return Painting::normalized_border_radius_data(*this, bordered_rect(),
computed_values().border_top_left_radius(),
computed_values().border_top_right_radius(),
computed_values().border_bottom_right_radius(),
computed_values().border_bottom_left_radius());
}
// https://www.w3.org/TR/css-display-3/#out-of-flow
bool Box::is_out_of_flow(FormattingContext const& formatting_context) const
{
// A box is out of flow if either:
// 1. It is floated (which requires that floating is not inhibited).
if (!formatting_context.inhibits_floating() && computed_values().float_() != CSS::Float::None)
return true;
// 2. It is "absolutely positioned".
switch (computed_values().position()) {
case CSS::Position::Absolute:
case CSS::Position::Fixed:
return true;
case CSS::Position::Static:
case CSS::Position::Relative:
case CSS::Position::Sticky:
break;
}
return false;
}
HitTestResult Box::hit_test(const Gfx::IntPoint& position, HitTestType type) const
{
// FIXME: It would be nice if we could confidently skip over hit testing
// parts of the layout tree, but currently we can't just check
// m_rect.contains() since inline text rects can't be trusted..
HitTestResult result { absolute_rect().contains(position.x(), position.y()) ? this : nullptr };
for_each_child_in_paint_order([&](auto& child) {
auto child_result = child.hit_test(position, type);
if (child_result.layout_node)
result = child_result;
});
return result;
}
void Box::set_needs_display()
{
if (!is_inline()) {
browsing_context().set_needs_display(enclosing_int_rect(absolute_rect()));
return;
}
Node::set_needs_display();
}
bool Box::is_body() const
{
return dom_node() && dom_node() == document().body();
}
void Box::set_offset(const Gfx::FloatPoint& offset)
{
if (m_offset == offset)
return;
m_offset = offset;
did_set_rect();
}
void Box::set_size(const Gfx::FloatSize& size)
{
if (m_size == size)
return;
m_size = size;
did_set_rect();
}
Gfx::FloatPoint Box::effective_offset() const
{
if (m_containing_line_box_fragment)
return m_containing_line_box_fragment->offset();
return m_offset;
}
const Gfx::FloatRect Box::absolute_rect() const
{
Gfx::FloatRect rect { effective_offset(), size() };
for (auto* block = containing_block(); block; block = block->containing_block()) {
rect.translate_by(block->effective_offset());
}
return rect;
}
void Box::set_containing_line_box_fragment(LineBoxFragment& fragment)
{
m_containing_line_box_fragment = fragment.make_weak_ptr();
}
StackingContext* Box::enclosing_stacking_context()
{
for (auto* ancestor = parent(); ancestor; ancestor = ancestor->parent()) {
if (!is<Box>(ancestor))
continue;
auto& ancestor_box = verify_cast<Box>(*ancestor);
if (!ancestor_box.establishes_stacking_context())
continue;
VERIFY(ancestor_box.stacking_context());
return ancestor_box.stacking_context();
}
// We should always reach the Layout::InitialContainingBlock stacking context.
VERIFY_NOT_REACHED();
}
void Box::before_children_paint(PaintContext& context, PaintPhase phase)
{
NodeWithStyleAndBoxModelMetrics::before_children_paint(context, phase);
// FIXME: Support more overflow variations.
if (computed_values().overflow_x() == CSS::Overflow::Hidden && computed_values().overflow_y() == CSS::Overflow::Hidden) {
context.painter().save();
context.painter().add_clip_rect(enclosing_int_rect(bordered_rect()));
}
}
void Box::after_children_paint(PaintContext& context, PaintPhase phase)
{
NodeWithStyleAndBoxModelMetrics::after_children_paint(context, phase);
// FIXME: Support more overflow variations.
if (computed_values().overflow_x() == CSS::Overflow::Hidden && computed_values().overflow_y() == CSS::Overflow::Hidden)
context.painter().restore();
}
}
|
