| /* |
| * Copyright (C) 1999 Lars Knoll (knoll@kde.org) |
| * (C) 1999 Antti Koivisto (koivisto@kde.org) |
| * (C) 2001 Dirk Mueller (mueller@kde.org) |
| * Copyright (C) 2004, 2005, 2006, 2007, 2010 Apple Inc. All rights reserved. |
| * (C) 2006 Alexey Proskuryakov (ap@nypop.com) |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public License |
| * along with this library; see the file COPYING.LIB. If not, write to |
| * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| * |
| */ |
| |
| #include "core/html/HTMLLabelElement.h" |
| |
| #include "core/HTMLNames.h" |
| #include "core/dom/Document.h" |
| #include "core/dom/ElementTraversal.h" |
| #include "core/editing/EditingUtilities.h" |
| #include "core/editing/FrameSelection.h" |
| #include "core/editing/SelectionController.h" |
| #include "core/events/MouseEvent.h" |
| #include "core/frame/LocalFrame.h" |
| #include "core/frame/UseCounter.h" |
| #include "core/html/FormAssociatedElement.h" |
| #include "core/html/HTMLFormControlElement.h" |
| #include "core/input/EventHandler.h" |
| #include "core/layout/LayoutObject.h" |
| |
| namespace blink { |
| |
| using namespace HTMLNames; |
| |
| inline HTMLLabelElement::HTMLLabelElement(Document& document, HTMLFormElement* form) |
| : HTMLElement(labelTag, document) |
| , m_processingClick(false) |
| { |
| FormAssociatedElement::associateByParser(form); |
| } |
| |
| HTMLLabelElement* HTMLLabelElement::create(Document& document, HTMLFormElement* form) |
| { |
| HTMLLabelElement* labelElement = new HTMLLabelElement(document, form); |
| return labelElement; |
| } |
| |
| LabelableElement* HTMLLabelElement::control() const |
| { |
| const AtomicString& controlId = getAttribute(forAttr); |
| if (controlId.isNull()) { |
| // Search the children and descendants of the label element for a form element. |
| // per http://dev.w3.org/html5/spec/Overview.html#the-label-element |
| // the form element must be "labelable form-associated element". |
| for (LabelableElement& element : Traversal<LabelableElement>::descendantsOf(*this)) { |
| if (element.supportLabels()) { |
| if (!element.isFormControlElement()) |
| UseCounter::count(document(), UseCounter::HTMLLabelElementControlForNonFormAssociatedElement); |
| return &element; |
| } |
| } |
| return nullptr; |
| } |
| |
| if (Element* element = treeScope().getElementById(controlId)) { |
| if (isLabelableElement(*element) && toLabelableElement(*element).supportLabels()) { |
| if (!element->isFormControlElement()) |
| UseCounter::count(document(), UseCounter::HTMLLabelElementControlForNonFormAssociatedElement); |
| return toLabelableElement(element); |
| } |
| } |
| |
| return nullptr; |
| } |
| |
| HTMLFormElement* HTMLLabelElement::formOwner() const |
| { |
| return FormAssociatedElement::form(); |
| } |
| |
| HTMLFormElement* HTMLLabelElement::formForBinding() const |
| { |
| HTMLFormElement* formOwner = FormAssociatedElement::form(); |
| HTMLFormElement* controlForm = nullptr; |
| if (LabelableElement* control = this->control()) { |
| if (control->isFormControlElement()) |
| controlForm = toHTMLFormControlElement(control)->form(); |
| } |
| if (formOwner != controlForm) |
| UseCounter::count(document(), UseCounter::HTMLLabelElementFormIsDifferentFromControlForm); |
| if (!controlForm && formOwner && formOwner == findFormAncestor()) |
| UseCounter::count(document(), UseCounter::HTMLLabelElementHasNoControlAndFormIsAncestor); |
| return formOwner; |
| } |
| |
| void HTMLLabelElement::setActive(bool down) |
| { |
| if (down != active()) { |
| // Update our status first. |
| HTMLElement::setActive(down); |
| } |
| |
| // Also update our corresponding control. |
| HTMLElement* controlElement = control(); |
| if (controlElement && controlElement->active() != active()) |
| controlElement->setActive(active()); |
| } |
| |
| void HTMLLabelElement::setHovered(bool over) |
| { |
| if (over != hovered()) { |
| // Update our status first. |
| HTMLElement::setHovered(over); |
| } |
| |
| // Also update our corresponding control. |
| HTMLElement* element = control(); |
| if (element && element->hovered() != hovered()) |
| element->setHovered(hovered()); |
| } |
| |
| bool HTMLLabelElement::isInteractiveContent() const |
| { |
| return true; |
| } |
| |
| bool HTMLLabelElement::isInInteractiveContent(Node* node) const |
| { |
| if (!isShadowIncludingInclusiveAncestorOf(node)) |
| return false; |
| while (node && this != node) { |
| if (node->isHTMLElement() && toHTMLElement(node)->isInteractiveContent()) |
| return true; |
| node = node->parentOrShadowHostNode(); |
| } |
| return false; |
| } |
| |
| void HTMLLabelElement::defaultEventHandler(Event* evt) |
| { |
| if (evt->type() == EventTypeNames::click && !m_processingClick) { |
| HTMLElement* element = control(); |
| |
| // If we can't find a control or if the control received the click |
| // event, then there's no need for us to do anything. |
| if (!element || (evt->target() && element->isShadowIncludingInclusiveAncestorOf(evt->target()->toNode()))) |
| return; |
| |
| if (evt->target() && isInInteractiveContent(evt->target()->toNode())) |
| return; |
| |
| // Behaviour of label element is as follows: |
| // - If there is double click, two clicks will be passed to control |
| // element. Control element will *not* be focused. |
| // - If there is selection of label element by dragging, no click |
| // event is passed. Also, no focus on control element. |
| // - If there is already a selection on label element and then label |
| // is clicked, then click event is passed to control element and |
| // control element is focused. |
| |
| bool isLabelTextSelected = false; |
| |
| // If the click is not simulated and the text of the label element |
| // is selected by dragging over it, then return without passing the |
| // click event to control element. |
| // Note: check if it is a MouseEvent because a click event may |
| // not be an instance of a MouseEvent if created by document.createEvent(). |
| if (evt->isMouseEvent() && toMouseEvent(evt)->hasPosition()) { |
| if (LocalFrame* frame = document().frame()) { |
| // Check if there is a selection and click is not on the |
| // selection. |
| if (layoutObject() && layoutObject()->isSelectable() && frame->selection().isRange() && !frame->eventHandler().selectionController().mouseDownWasSingleClickInSelection()) |
| isLabelTextSelected = true; |
| // If selection is there and is single click i.e. text is |
| // selected by dragging over label text, then return. |
| // Click count >=2, meaning double click or triple click, |
| // should pass click event to control element. |
| // Only in case of drag, *neither* we pass the click event, |
| // *nor* we focus the control element. |
| if (isLabelTextSelected && frame->eventHandler().clickCount() == 1) |
| return; |
| } |
| } |
| |
| m_processingClick = true; |
| |
| document().updateLayoutIgnorePendingStylesheets(); |
| if (element->isMouseFocusable()) { |
| // If the label is *not* selected, or if the click happened on |
| // selection of label, only then focus the control element. |
| // In case of double click or triple click, selection will be there, |
| // so do not focus the control element. |
| if (!isLabelTextSelected) |
| element->focus(FocusParams(SelectionBehaviorOnFocus::Restore, WebFocusTypeMouse, nullptr)); |
| } |
| |
| // Click the corresponding control. |
| element->dispatchSimulatedClick(evt); |
| |
| m_processingClick = false; |
| |
| evt->setDefaultHandled(); |
| } |
| |
| HTMLElement::defaultEventHandler(evt); |
| } |
| |
| bool HTMLLabelElement::willRespondToMouseClickEvents() |
| { |
| if (control() && control()->willRespondToMouseClickEvents()) |
| return true; |
| |
| return HTMLElement::willRespondToMouseClickEvents(); |
| } |
| |
| void HTMLLabelElement::focus(const FocusParams& params) |
| { |
| document().updateLayoutTreeForNode(this); |
| if (isFocusable()) { |
| HTMLElement::focus(params); |
| return; |
| } |
| // To match other browsers, always restore previous selection. |
| if (HTMLElement* element = control()) |
| element->focus(FocusParams(SelectionBehaviorOnFocus::Restore, params.type, params.sourceCapabilities)); |
| } |
| |
| void HTMLLabelElement::accessKeyAction(bool sendMouseEvents) |
| { |
| if (HTMLElement* element = control()) |
| element->accessKeyAction(sendMouseEvents); |
| else |
| HTMLElement::accessKeyAction(sendMouseEvents); |
| } |
| |
| void HTMLLabelElement::updateLabel(TreeScope& scope, const AtomicString& oldForAttributeValue, const AtomicString& newForAttributeValue) |
| { |
| if (!inShadowIncludingDocument()) |
| return; |
| |
| if (oldForAttributeValue == newForAttributeValue) |
| return; |
| |
| if (!oldForAttributeValue.isEmpty()) |
| scope.removeLabel(oldForAttributeValue, this); |
| if (!newForAttributeValue.isEmpty()) |
| scope.addLabel(newForAttributeValue, this); |
| } |
| |
| Node::InsertionNotificationRequest HTMLLabelElement::insertedInto(ContainerNode* insertionPoint) |
| { |
| InsertionNotificationRequest result = HTMLElement::insertedInto(insertionPoint); |
| FormAssociatedElement::insertedInto(insertionPoint); |
| if (insertionPoint->isInTreeScope()) { |
| TreeScope& scope = insertionPoint->treeScope(); |
| if (scope == treeScope() && scope.shouldCacheLabelsByForAttribute()) |
| updateLabel(scope, nullAtom, fastGetAttribute(forAttr)); |
| } |
| |
| // Trigger for elements outside of forms. |
| if (!formOwner() && insertionPoint->inShadowIncludingDocument()) |
| document().didAssociateFormControl(this); |
| |
| return result; |
| } |
| |
| void HTMLLabelElement::removedFrom(ContainerNode* insertionPoint) |
| { |
| if (insertionPoint->isInTreeScope() && treeScope() == document()) { |
| TreeScope& treeScope = insertionPoint->treeScope(); |
| if (treeScope.shouldCacheLabelsByForAttribute()) |
| updateLabel(treeScope, fastGetAttribute(forAttr), nullAtom); |
| } |
| HTMLElement::removedFrom(insertionPoint); |
| FormAssociatedElement::removedFrom(insertionPoint); |
| document().removeFormAssociation(this); |
| } |
| |
| DEFINE_TRACE(HTMLLabelElement) |
| { |
| HTMLElement::trace(visitor); |
| FormAssociatedElement::trace(visitor); |
| } |
| |
| void HTMLLabelElement::parseAttribute(const QualifiedName& attributeName, const AtomicString& oldValue, const AtomicString& attributeValue) |
| { |
| if (attributeName == formAttr) { |
| formAttributeChanged(); |
| UseCounter::count(document(), UseCounter::HTMLLabelElementFormContentAttribute); |
| } else { |
| if (attributeName == forAttr) { |
| TreeScope& scope = treeScope(); |
| if (scope.shouldCacheLabelsByForAttribute()) |
| updateLabel(scope, oldValue, attributeValue); |
| } |
| HTMLElement::parseAttribute(attributeName, oldValue, attributeValue); |
| } |
| } |
| |
| } // namespace blink |
