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
|
/*
* Copyright (C) 2012 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:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS 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 APPLE OR ITS 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/core/html/html_dialog_element.h"
#include "third_party/blink/renderer/core/accessibility/ax_object_cache.h"
#include "third_party/blink/renderer/core/dom/events/event.h"
#include "third_party/blink/renderer/core/dom/flat_tree_traversal.h"
#include "third_party/blink/renderer/core/frame/local_frame_view.h"
#include "third_party/blink/renderer/core/frame/use_counter.h"
#include "third_party/blink/renderer/core/fullscreen/fullscreen.h"
#include "third_party/blink/renderer/core/html/forms/html_form_control_element.h"
#include "third_party/blink/renderer/core/html/html_frame_owner_element.h"
#include "third_party/blink/renderer/platform/bindings/exception_state.h"
namespace blink {
using namespace HTMLNames;
// This function chooses the focused element when show() or showModal() is
// invoked, as described in their spec.
static void SetFocusForDialog(HTMLDialogElement* dialog) {
Element* focusable_descendant = nullptr;
Node* next = nullptr;
// TODO(kochi): How to find focusable element inside Shadow DOM is not
// currently specified. This may change at any time.
// See crbug/383230 and https://github.com/whatwg/html/issues/2393 .
for (Node* node = FlatTreeTraversal::FirstChild(*dialog); node; node = next) {
next = IsHTMLDialogElement(*node)
? FlatTreeTraversal::NextSkippingChildren(*node, dialog)
: FlatTreeTraversal::Next(*node, dialog);
if (!node->IsElementNode())
continue;
Element* element = ToElement(node);
if (element->IsFormControlElement()) {
HTMLFormControlElement* control = ToHTMLFormControlElement(node);
if (control->IsAutofocusable() && control->IsFocusable()) {
control->focus();
return;
}
}
if (!focusable_descendant && element->IsFocusable())
focusable_descendant = element;
}
if (focusable_descendant) {
focusable_descendant->focus();
return;
}
if (dialog->IsFocusable()) {
dialog->focus();
return;
}
dialog->GetDocument().ClearFocusedElement();
}
static void InertSubtreesChanged(Document& document) {
if (document.GetFrame()) {
// SetIsInert recurses through subframes to propagate the inert bit as
// needed.
document.GetFrame()->SetIsInert(document.LocalOwner() &&
document.LocalOwner()->IsInert());
}
// When a modal dialog opens or closes, nodes all over the accessibility
// tree can change inertness which means they must be added or removed from
// the tree. The most foolproof way is to clear the entire tree and rebuild
// it, though a more clever way is probably possible.
document.ClearAXObjectCache();
}
inline HTMLDialogElement::HTMLDialogElement(Document& document)
: HTMLElement(dialogTag, document),
centering_mode_(kNotCentered),
centered_position_(0),
return_value_("") {
UseCounter::Count(document, WebFeature::kDialogElement);
}
DEFINE_NODE_FACTORY(HTMLDialogElement)
void HTMLDialogElement::close(const String& return_value) {
// https://html.spec.whatwg.org/#close-the-dialog
if (!FastHasAttribute(openAttr))
return;
SetBooleanAttribute(openAttr, false);
HTMLDialogElement* active_modal_dialog = GetDocument().ActiveModalDialog();
GetDocument().RemoveFromTopLayer(this);
if (active_modal_dialog == this)
InertSubtreesChanged(GetDocument());
if (!return_value.IsNull())
return_value_ = return_value;
ScheduleCloseEvent();
}
void HTMLDialogElement::ForceLayoutForCentering() {
centering_mode_ = kNeedsCentering;
GetDocument().UpdateStyleAndLayoutIgnorePendingStylesheets();
if (centering_mode_ == kNeedsCentering)
SetNotCentered();
}
void HTMLDialogElement::ScheduleCloseEvent() {
Event* event = Event::Create(EventTypeNames::close);
event->SetTarget(this);
GetDocument().EnqueueAnimationFrameEvent(event);
}
void HTMLDialogElement::show() {
if (FastHasAttribute(openAttr))
return;
SetBooleanAttribute(openAttr, true);
// The layout must be updated here because setFocusForDialog calls
// Element::isFocusable, which requires an up-to-date layout.
GetDocument().UpdateStyleAndLayoutIgnorePendingStylesheets();
SetFocusForDialog(this);
}
void HTMLDialogElement::showModal(ExceptionState& exception_state) {
if (FastHasAttribute(openAttr)) {
exception_state.ThrowDOMException(DOMExceptionCode::kInvalidStateError,
"The element already has an 'open' "
"attribute, and therefore cannot be "
"opened modally.");
return;
}
if (!isConnected()) {
exception_state.ThrowDOMException(DOMExceptionCode::kInvalidStateError,
"The element is not in a Document.");
return;
}
// See comment in |Fullscreen::RequestFullscreen|.
if (Fullscreen::IsInFullscreenElementStack(*this)) {
UseCounter::Count(GetDocument(),
WebFeature::kShowModalForElementInFullscreenStack);
}
GetDocument().AddToTopLayer(this);
SetBooleanAttribute(openAttr, true);
// Throw away the AX cache first, so the subsequent steps don't have a chance
// of queuing up AX events on objects that would be invalidated when the cache
// is thrown away.
InertSubtreesChanged(GetDocument());
ForceLayoutForCentering();
SetFocusForDialog(this);
}
void HTMLDialogElement::RemovedFrom(ContainerNode* insertion_point) {
HTMLElement::RemovedFrom(insertion_point);
SetNotCentered();
InertSubtreesChanged(GetDocument());
}
void HTMLDialogElement::SetCentered(LayoutUnit centered_position) {
DCHECK_EQ(centering_mode_, kNeedsCentering);
centered_position_ = centered_position;
centering_mode_ = kCentered;
}
void HTMLDialogElement::SetNotCentered() {
centering_mode_ = kNotCentered;
}
bool HTMLDialogElement::IsPresentationAttribute(
const QualifiedName& name) const {
// FIXME: Workaround for <https://bugs.webkit.org/show_bug.cgi?id=91058>:
// modifying an attribute for which there is an attribute selector in html.css
// sometimes does not trigger a style recalc.
if (name == openAttr)
return true;
return HTMLElement::IsPresentationAttribute(name);
}
void HTMLDialogElement::DefaultEventHandler(Event* event) {
if (event->type() == EventTypeNames::cancel) {
close();
event->SetDefaultHandled();
return;
}
HTMLElement::DefaultEventHandler(event);
}
} // namespace blink
|
