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      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().
     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 
     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 
     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 
    102 PassRefPtr<HTMLDialogElement> HTMLDialogElement::create(Document& document)
    103 {
    104     return adoptRef(new HTMLDialogElement(document));
    105 }
    106 
    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 
    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 
    133 void HTMLDialogElement::forceLayoutForCentering()
    134 {
    135     m_centeringMode = Uninitialized;
    136     document().updateLayoutIgnorePendingStylesheets();
    137     if (m_centeringMode == Uninitialized)
    138         m_centeringMode = NotCentered;
    139 }
    140 
    141 void HTMLDialogElement::show()
    142 {
    143     if (fastHasAttribute(openAttr))
    144         return;
    145     setBooleanAttribute(openAttr, true);
    146     forceLayoutForCentering();
    147 }
    148 
    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 
    171 void HTMLDialogElement::setCentered(LayoutUnit centeredPosition)
    172 {
    173     ASSERT(m_centeringMode == Uninitialized);
    174     m_centeredPosition = centeredPosition;
    175     m_centeringMode = Centered;
    176 }
    177 
    178 void HTMLDialogElement::setNotCentered()
    179 {
    180     ASSERT(m_centeringMode == Uninitialized);
    181     m_centeringMode = NotCentered;
    182 }
    183 
    184 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 
    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 
    204 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