gecko/content/base/public/Element.h
Cameron McCormack 0dc074a5c3 Bug 795802 - Define content flags like frame state bits. r=bz
--HG--
extra : rebase_source : 4d67320ada060e29644ab6c070a1d5154b304d96
2012-10-02 10:52:06 +10:00

352 lines
11 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: sw=2 ts=2 et :
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef mozilla_dom_Element_h__
#define mozilla_dom_Element_h__
#include "mozilla/dom/FragmentOrElement.h" // for base class
#include "nsChangeHint.h" // for enum
#include "nsEventStates.h" // for member
#include "mozilla/dom/DirectionalityUtils.h"
class nsEventStateManager;
class nsFocusManager;
class nsGlobalWindow;
class nsICSSDeclaration;
class nsISMILAttr;
#define ELEMENT_FLAG_BIT(n_) NODE_FLAG_BIT(NODE_TYPE_SPECIFIC_BITS_OFFSET + (n_))
// Element-specific flags
enum {
// Set if the element has a pending style change.
ELEMENT_HAS_PENDING_RESTYLE = ELEMENT_FLAG_BIT(0),
// Set if the element is a potential restyle root (that is, has a style
// change pending _and_ that style change will attempt to restyle
// descendants).
ELEMENT_IS_POTENTIAL_RESTYLE_ROOT = ELEMENT_FLAG_BIT(1),
// Set if the element has a pending animation style change.
ELEMENT_HAS_PENDING_ANIMATION_RESTYLE = ELEMENT_FLAG_BIT(2),
// Set if the element is a potential animation restyle root (that is,
// has an animation style change pending _and_ that style change
// will attempt to restyle descendants).
ELEMENT_IS_POTENTIAL_ANIMATION_RESTYLE_ROOT = ELEMENT_FLAG_BIT(3),
// All of those bits together, for convenience.
ELEMENT_ALL_RESTYLE_FLAGS = ELEMENT_HAS_PENDING_RESTYLE |
ELEMENT_IS_POTENTIAL_RESTYLE_ROOT |
ELEMENT_HAS_PENDING_ANIMATION_RESTYLE |
ELEMENT_IS_POTENTIAL_ANIMATION_RESTYLE_ROOT,
// Just the HAS_PENDING bits, for convenience
ELEMENT_PENDING_RESTYLE_FLAGS = ELEMENT_HAS_PENDING_RESTYLE |
ELEMENT_HAS_PENDING_ANIMATION_RESTYLE,
// Remaining bits are for subclasses
ELEMENT_TYPE_SPECIFIC_BITS_OFFSET = NODE_TYPE_SPECIFIC_BITS_OFFSET + 4
};
#undef ELEMENT_FLAG_BIT
namespace mozilla {
namespace dom {
class Link;
// IID for the dom::Element interface
#define NS_ELEMENT_IID \
{ 0xc6c049a1, 0x96e8, 0x4580, \
{ 0xa6, 0x93, 0xb9, 0x5f, 0x53, 0xbe, 0xe8, 0x1c } }
class Element : public FragmentOrElement
{
public:
#ifdef MOZILLA_INTERNAL_API
Element(already_AddRefed<nsINodeInfo> aNodeInfo) :
FragmentOrElement(aNodeInfo),
mState(NS_EVENT_STATE_MOZ_READONLY)
{}
#endif // MOZILLA_INTERNAL_API
NS_DECLARE_STATIC_IID_ACCESSOR(NS_ELEMENT_IID)
/**
* Method to get the full state of this element. See nsEventStates.h for
* the possible bits that could be set here.
*/
nsEventStates State() const {
// mState is maintained by having whoever might have changed it
// call UpdateState() or one of the other mState mutators.
return mState;
}
/**
* Ask this element to update its state. If aNotify is false, then
* state change notifications will not be dispatched; in that
* situation it is the caller's responsibility to dispatch them.
*
* In general, aNotify should only be false if we're guaranteed that
* the element can't have a frame no matter what its style is
* (e.g. if we're in the middle of adding it to the document or
* removing it from the document).
*/
void UpdateState(bool aNotify);
/**
* Method to update mState with link state information. This does not notify.
*/
void UpdateLinkState(nsEventStates aState);
/**
* Returns true if this element is either a full-screen element or an
* ancestor of the full-screen element.
*/
bool IsFullScreenAncestor() const {
return mState.HasAtLeastOneOfStates(NS_EVENT_STATE_FULL_SCREEN_ANCESTOR |
NS_EVENT_STATE_FULL_SCREEN);
}
/**
* The style state of this element. This is the real state of the element
* with any style locks applied for pseudo-class inspecting.
*/
nsEventStates StyleState() const {
if (!HasLockedStyleStates()) {
return mState;
}
return StyleStateFromLocks();
}
/**
* The style state locks applied to this element.
*/
nsEventStates LockedStyleStates() const;
/**
* Add a style state lock on this element.
*/
void LockStyleStates(nsEventStates aStates);
/**
* Remove a style state lock on this element.
*/
void UnlockStyleStates(nsEventStates aStates);
/**
* Clear all style state locks on this element.
*/
void ClearStyleStateLocks();
/**
* Get the inline style rule, if any, for this element.
*/
virtual css::StyleRule* GetInlineStyleRule() = 0;
/**
* Set the inline style rule for this element. This will send an appropriate
* AttributeChanged notification if aNotify is true.
*/
virtual nsresult SetInlineStyleRule(css::StyleRule* aStyleRule,
const nsAString* aSerialized,
bool aNotify) = 0;
/**
* Get the SMIL override style rule for this element. If the rule hasn't been
* created, this method simply returns null.
*/
virtual css::StyleRule* GetSMILOverrideStyleRule() = 0;
/**
* Set the SMIL override style rule for this element. If aNotify is true, this
* method will notify the document's pres context, so that the style changes
* will be noticed.
*/
virtual nsresult SetSMILOverrideStyleRule(css::StyleRule* aStyleRule,
bool aNotify) = 0;
/**
* Returns a new nsISMILAttr that allows the caller to animate the given
* attribute on this element.
*
* The CALLER OWNS the result and is responsible for deleting it.
*/
virtual nsISMILAttr* GetAnimatedAttr(int32_t aNamespaceID, nsIAtom* aName) = 0;
/**
* Get the SMIL override style for this element. This is a style declaration
* that is applied *after* the inline style, and it can be used e.g. to store
* animated style values.
*
* Note: This method is analogous to the 'GetStyle' method in
* nsGenericHTMLElement and nsStyledElement.
*/
virtual nsICSSDeclaration* GetSMILOverrideStyle() = 0;
/**
* Returns if the element is labelable as per HTML specification.
*/
virtual bool IsLabelable() const = 0;
/**
* Is the attribute named stored in the mapped attributes?
*
* // XXXbz we use this method in HasAttributeDependentStyle, so svg
* returns true here even though it stores nothing in the mapped
* attributes.
*/
NS_IMETHOD_(bool) IsAttributeMapped(const nsIAtom* aAttribute) const = 0;
/**
* Get a hint that tells the style system what to do when
* an attribute on this node changes, if something needs to happen
* in response to the change *other* than the result of what is
* mapped into style data via any type of style rule.
*/
virtual nsChangeHint GetAttributeChangeHint(const nsIAtom* aAttribute,
int32_t aModType) const = 0;
/**
* Returns an atom holding the name of the "class" attribute on this
* content node (if applicable). Returns null if there is no
* "class" attribute for this type of content node.
*/
virtual nsIAtom *GetClassAttributeName() const = 0;
inline mozilla::directionality::Directionality GetDirectionality() const {
if (HasFlag(NODE_HAS_DIRECTION_RTL)) {
return mozilla::directionality::eDir_RTL;
}
if (HasFlag(NODE_HAS_DIRECTION_LTR)) {
return mozilla::directionality::eDir_LTR;
}
return mozilla::directionality::eDir_NotSet;
}
inline void SetDirectionality(mozilla::directionality::Directionality aDir,
bool aNotify) {
UnsetFlags(NODE_ALL_DIRECTION_FLAGS);
if (!aNotify) {
RemoveStatesSilently(DIRECTION_STATES);
}
switch (aDir) {
case (mozilla::directionality::eDir_RTL):
SetFlags(NODE_HAS_DIRECTION_RTL);
if (!aNotify) {
AddStatesSilently(NS_EVENT_STATE_RTL);
}
break;
case(mozilla::directionality::eDir_LTR):
SetFlags(NODE_HAS_DIRECTION_LTR);
if (!aNotify) {
AddStatesSilently(NS_EVENT_STATE_LTR);
}
break;
default:
break;
}
/*
* Only call UpdateState if we need to notify, because we call
* SetDirectionality for every element, and UpdateState is very very slow
* for some elements.
*/
if (aNotify) {
UpdateState(true);
}
}
protected:
/**
* Method to get the _intrinsic_ content state of this element. This is the
* state that is independent of the element's presentation. To get the full
* content state, use State(). See nsEventStates.h for
* the possible bits that could be set here.
*/
virtual nsEventStates IntrinsicState() const;
/**
* Method to add state bits. This should be called from subclass
* constructors to set up our event state correctly at construction
* time and other places where we don't want to notify a state
* change.
*/
void AddStatesSilently(nsEventStates aStates) {
mState |= aStates;
}
/**
* Method to remove state bits. This should be called from subclass
* constructors to set up our event state correctly at construction
* time and other places where we don't want to notify a state
* change.
*/
void RemoveStatesSilently(nsEventStates aStates) {
mState &= ~aStates;
}
private:
// Need to allow the ESM, nsGlobalWindow, and the focus manager to
// set our state
friend class ::nsEventStateManager;
friend class ::nsGlobalWindow;
friend class ::nsFocusManager;
// Also need to allow Link to call UpdateLinkState.
friend class Link;
void NotifyStateChange(nsEventStates aStates);
void NotifyStyleStateChange(nsEventStates aStates);
// Style state computed from element's state and style locks.
nsEventStates StyleStateFromLocks() const;
// Methods for the ESM to manage state bits. These will handle
// setting up script blockers when they notify, so no need to do it
// in the callers unless desired.
void AddStates(nsEventStates aStates) {
NS_PRECONDITION(!aStates.HasAtLeastOneOfStates(INTRINSIC_STATES),
"Should only be adding ESM-managed states here");
AddStatesSilently(aStates);
NotifyStateChange(aStates);
}
void RemoveStates(nsEventStates aStates) {
NS_PRECONDITION(!aStates.HasAtLeastOneOfStates(INTRINSIC_STATES),
"Should only be removing ESM-managed states here");
RemoveStatesSilently(aStates);
NotifyStateChange(aStates);
}
nsEventStates mState;
};
NS_DEFINE_STATIC_IID_ACCESSOR(Element, NS_ELEMENT_IID)
} // namespace dom
} // namespace mozilla
inline mozilla::dom::Element* nsINode::AsElement()
{
MOZ_ASSERT(IsElement());
return static_cast<mozilla::dom::Element*>(this);
}
inline const mozilla::dom::Element* nsINode::AsElement() const
{
MOZ_ASSERT(IsElement());
return static_cast<const mozilla::dom::Element*>(this);
}
#endif // mozilla_dom_Element_h__