1 /*
2 * Copyright (C) 2012 Google Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
16 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
17 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
18 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
19 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
20 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
21 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26 #include "config.h"
27 #include "core/html/HTMLDialogElement.h"
28
29 #include "bindings/v8/ExceptionState.h"
30 #include "core/accessibility/AXObjectCache.h"
31 #include "core/dom/ExceptionCode.h"
32 #include "core/dom/NodeTraversal.h"
33 #include "core/html/HTMLFormControlElement.h"
34 #include "core/frame/FrameView.h"
35 #include "core/rendering/RenderBlock.h"
36 #include "core/rendering/style/RenderStyle.h"
37
38 namespace WebCore {
39
40 using namespace HTMLNames;
41
42 // This function chooses the focused element when showModal() is invoked, as described in the spec for showModal().
setFocusForModalDialog(HTMLDialogElement * dialog)43 static void setFocusForModalDialog(HTMLDialogElement* dialog)
44 {
45 Element* focusableDescendant = 0;
46 Node* next = 0;
47 for (Node* node = dialog->firstChild(); node; node = next) {
48 if (node->hasTagName(dialogTag))
49 next = NodeTraversal::nextSkippingChildren(*node, dialog);
50 else
51 next = NodeTraversal::next(*node, dialog);
52
53 if (!node->isElementNode())
54 continue;
55 Element* element = toElement(node);
56 if (element->isFormControlElement()) {
57 HTMLFormControlElement* control = toHTMLFormControlElement(node);
58 if (control->isAutofocusable()) {
59 control->focus();
60 control->setAutofocused();
61 return;
62 }
63 }
64 if (!focusableDescendant && element->isFocusable())
65 focusableDescendant = element;
66 }
67
68 if (focusableDescendant) {
69 focusableDescendant->focus();
70 return;
71 }
72
73 if (dialog->isFocusable()) {
74 dialog->focus();
75 return;
76 }
77
78 dialog->document().setFocusedElement(0);
79 }
80
inertSubtreesChanged(Document & document)81 static void inertSubtreesChanged(Document& document)
82 {
83 // When a modal dialog opens or closes, nodes all over the accessibility
84 // tree can change inertness which means they must be added or removed from
85 // the tree. The most foolproof way is to clear the entire tree and rebuild
86 // it, though a more clever way is probably possible.
87 Document* topDocument = document.topDocument();
88 topDocument->clearAXObjectCache();
89 if (AXObjectCache* cache = topDocument->axObjectCache())
90 cache->childrenChanged(cache->getOrCreate(topDocument));
91 }
92
HTMLDialogElement(Document & document)93 HTMLDialogElement::HTMLDialogElement(Document& document)
94 : HTMLElement(dialogTag, document)
95 , m_centeringMode(Uninitialized)
96 , m_centeredPosition(0)
97 , m_returnValue("")
98 {
99 ScriptWrappable::init(this);
100 }
101
create(Document & document)102 PassRefPtr<HTMLDialogElement> HTMLDialogElement::create(Document& document)
103 {
104 return adoptRef(new HTMLDialogElement(document));
105 }
106
close(const String & returnValue,ExceptionState & exceptionState)107 void HTMLDialogElement::close(const String& returnValue, ExceptionState& exceptionState)
108 {
109 if (!fastHasAttribute(openAttr)) {
110 exceptionState.throwDOMException(InvalidStateError, "The element does not have an 'open' attribute, and therefore cannot be closed.");
111 return;
112 }
113 closeDialog(returnValue);
114 }
115
closeDialog(const String & returnValue)116 void HTMLDialogElement::closeDialog(const String& returnValue)
117 {
118 if (!fastHasAttribute(openAttr))
119 return;
120 setBooleanAttribute(openAttr, false);
121
122 HTMLDialogElement* activeModalDialog = document().activeModalDialog();
123 document().removeFromTopLayer(this);
124 if (activeModalDialog == this)
125 inertSubtreesChanged(document());
126
127 if (!returnValue.isNull())
128 m_returnValue = returnValue;
129
130 dispatchScopedEvent(Event::create(EventTypeNames::close));
131 }
132
forceLayoutForCentering()133 void HTMLDialogElement::forceLayoutForCentering()
134 {
135 m_centeringMode = Uninitialized;
136 document().updateLayoutIgnorePendingStylesheets();
137 if (m_centeringMode == Uninitialized)
138 m_centeringMode = NotCentered;
139 }
140
show()141 void HTMLDialogElement::show()
142 {
143 if (fastHasAttribute(openAttr))
144 return;
145 setBooleanAttribute(openAttr, true);
146 forceLayoutForCentering();
147 }
148
showModal(ExceptionState & exceptionState)149 void HTMLDialogElement::showModal(ExceptionState& exceptionState)
150 {
151 if (fastHasAttribute(openAttr)) {
152 exceptionState.throwDOMException(InvalidStateError, "The element already has an 'open' attribute, and therefore cannot be opened modally.");
153 return;
154 }
155 if (!inDocument()) {
156 exceptionState.throwDOMException(InvalidStateError, "The element is not in a Document.");
157 return;
158 }
159
160 document().addToTopLayer(this);
161 setBooleanAttribute(openAttr, true);
162
163 // Throw away the AX cache first, so the subsequent steps don't have a chance of queuing up
164 // AX events on objects that would be invalidated when the cache is thrown away.
165 inertSubtreesChanged(document());
166
167 forceLayoutForCentering();
168 setFocusForModalDialog(this);
169 }
170
setCentered(LayoutUnit centeredPosition)171 void HTMLDialogElement::setCentered(LayoutUnit centeredPosition)
172 {
173 ASSERT(m_centeringMode == Uninitialized);
174 m_centeredPosition = centeredPosition;
175 m_centeringMode = Centered;
176 }
177
setNotCentered()178 void HTMLDialogElement::setNotCentered()
179 {
180 ASSERT(m_centeringMode == Uninitialized);
181 m_centeringMode = NotCentered;
182 }
183
isPresentationAttribute(const QualifiedName & name) const184 bool HTMLDialogElement::isPresentationAttribute(const QualifiedName& name) const
185 {
186 // FIXME: Workaround for <https://bugs.webkit.org/show_bug.cgi?id=91058>: modifying an attribute for which there is an attribute selector
187 // in html.css sometimes does not trigger a style recalc.
188 if (name == openAttr)
189 return true;
190
191 return HTMLElement::isPresentationAttribute(name);
192 }
193
defaultEventHandler(Event * event)194 void HTMLDialogElement::defaultEventHandler(Event* event)
195 {
196 if (event->type() == EventTypeNames::cancel) {
197 closeDialog();
198 event->setDefaultHandled();
199 return;
200 }
201 HTMLElement::defaultEventHandler(event);
202 }
203
shouldBeReparentedUnderRenderView(const RenderStyle * style) const204 bool HTMLDialogElement::shouldBeReparentedUnderRenderView(const RenderStyle* style) const
205 {
206 if (style && style->position() == AbsolutePosition)
207 return true;
208 return Element::shouldBeReparentedUnderRenderView(style);
209 }
210
211 } // namespace WebCore
212