gecko-dev/dom/events/EventStates.h

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C
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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
2012-05-21 15:12:37 +04:00
/* 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_EventStates_h_
#define mozilla_EventStates_h_
#include "mozilla/Attributes.h"
#include "nsDebug.h"
namespace mozilla {
/**
* EventStates is the class used to represent the event states of nsIContent
* instances. These states are calculated by IntrinsicState() and
* ContentStatesChanged() has to be called when one of them changes thus
* informing the layout/style engine of the change.
* Event states are associated with pseudo-classes.
*/
class EventStates
{
public:
typedef uint64_t InternalType;
typedef uint64_t ServoType;
constexpr EventStates()
: mStates(0)
{
}
// NOTE: the ideal scenario would be to have the default constructor public
// setting mStates to 0 and this constructor (without = 0) private.
// In that case, we could be sure that only macros at the end were creating
// EventStates instances with mStates set to something else than 0.
// Unfortunately, this constructor is needed at at least two places now.
explicit constexpr EventStates(InternalType aStates)
: mStates(aStates)
{
}
EventStates constexpr operator|(const EventStates& aEventStates) const
{
return EventStates(mStates | aEventStates.mStates);
}
EventStates& operator|=(const EventStates& aEventStates)
{
mStates |= aEventStates.mStates;
return *this;
}
// NOTE: calling if (eventStates1 & eventStates2) will not build.
// This might work correctly if operator bool() is defined
// but using HasState, HasAllStates or HasAtLeastOneOfStates is recommended.
EventStates constexpr operator&(const EventStates& aEventStates) const
{
return EventStates(mStates & aEventStates.mStates);
}
EventStates& operator&=(const EventStates& aEventStates)
{
mStates &= aEventStates.mStates;
return *this;
}
bool operator==(const EventStates& aEventStates) const
{
return mStates == aEventStates.mStates;
}
bool operator!=(const EventStates& aEventStates) const
{
return mStates != aEventStates.mStates;
}
EventStates operator~() const
{
return EventStates(~mStates);
}
EventStates operator^(const EventStates& aEventStates) const
{
return EventStates(mStates ^ aEventStates.mStates);
}
EventStates& operator^=(const EventStates& aEventStates)
{
mStates ^= aEventStates.mStates;
return *this;
}
/**
* Returns true if the EventStates instance is empty.
* A EventStates instance is empty if it contains no state.
*
* @return Whether if the object is empty.
*/
bool IsEmpty() const
{
return mStates == 0;
}
/**
* Returns true if the EventStates instance contains the state
* contained in aEventStates.
* @note aEventStates should contain only one state.
*
* @param aEventStates The state to check.
*
* @return Whether the object has the state from aEventStates
*/
bool HasState(EventStates aEventStates) const
{
#ifdef DEBUG
// If aEventStates.mStates is a power of two, it contains only one state
// (or none, but we don't really care).
if ((aEventStates.mStates & (aEventStates.mStates - 1))) {
NS_ERROR("When calling HasState, "
"EventStates object has to contain only one state!");
}
#endif // DEBUG
return mStates & aEventStates.mStates;
}
/**
* Returns true if the EventStates instance contains one of the states
* contained in aEventStates.
*
* @param aEventStates The states to check.
*
* @return Whether the object has at least one state from aEventStates
*/
bool HasAtLeastOneOfStates(EventStates aEventStates) const
{
return mStates & aEventStates.mStates;
}
/**
* Returns true if the EventStates instance contains all states
* contained in aEventStates.
*
* @param aEventStates The states to check.
*
* @return Whether the object has all states from aEventStates
*/
bool HasAllStates(EventStates aEventStates) const
{
return (mStates & aEventStates.mStates) == aEventStates.mStates;
}
// We only need that method for inDOMUtils::GetContentState.
// If inDOMUtils::GetContentState is removed, this method should be removed.
InternalType GetInternalValue() const {
return mStates;
}
/**
* Method used to get the appropriate state representation for Servo.
*/
ServoType ServoValue() const
{
return mStates;
}
private:
InternalType mStates;
};
} // namespace mozilla
/**
* The following macros are creating EventStates instance with different
* values depending of their meaning.
* Ideally, EventStates instance with values different than 0 should only be
* created that way.
*/
// Helper to define a new EventStates macro.
#define NS_DEFINE_EVENT_STATE_MACRO(_val) \
(mozilla::EventStates(mozilla::EventStates::InternalType(1) << _val))
/*
* In order to efficiently convert Gecko EventState values into Servo
* ElementState values [1], we maintain the invariant that the low bits of
* EventState can be masked off to form an ElementState (this works so
* long as Servo never supports a state that Gecko doesn't).
*
* This is unfortunately rather fragile for now, but we should soon have
* the infrastructure to statically-assert that these match up. If you
* need to change these, please notify somebody involved with Stylo.
*
* [1] https://github.com/servo/servo/blob/master/components/style/element_state.rs
*/
// Mouse is down on content.
#define NS_EVENT_STATE_ACTIVE NS_DEFINE_EVENT_STATE_MACRO(0)
// Content has focus.
#define NS_EVENT_STATE_FOCUS NS_DEFINE_EVENT_STATE_MACRO(1)
// Mouse is hovering over content.
#define NS_EVENT_STATE_HOVER NS_DEFINE_EVENT_STATE_MACRO(2)
// Content is enabled (and can be disabled).
#define NS_EVENT_STATE_ENABLED NS_DEFINE_EVENT_STATE_MACRO(3)
// Content is disabled.
#define NS_EVENT_STATE_DISABLED NS_DEFINE_EVENT_STATE_MACRO(4)
// Content is checked.
#define NS_EVENT_STATE_CHECKED NS_DEFINE_EVENT_STATE_MACRO(5)
// Content is in the indeterminate state.
#define NS_EVENT_STATE_INDETERMINATE NS_DEFINE_EVENT_STATE_MACRO(6)
// Content shows its placeholder
#define NS_EVENT_STATE_PLACEHOLDERSHOWN NS_DEFINE_EVENT_STATE_MACRO(7)
// Content is URL's target (ref).
#define NS_EVENT_STATE_URLTARGET NS_DEFINE_EVENT_STATE_MACRO(8)
// Content is the full screen element, or a frame containing the
// current full-screen element.
#define NS_EVENT_STATE_FULL_SCREEN NS_DEFINE_EVENT_STATE_MACRO(9)
// Content is valid (and can be invalid).
#define NS_EVENT_STATE_VALID NS_DEFINE_EVENT_STATE_MACRO(10)
// Content is invalid.
#define NS_EVENT_STATE_INVALID NS_DEFINE_EVENT_STATE_MACRO(11)
// UI friendly version of :valid pseudo-class.
#define NS_EVENT_STATE_MOZ_UI_VALID NS_DEFINE_EVENT_STATE_MACRO(12)
// UI friendly version of :invalid pseudo-class.
#define NS_EVENT_STATE_MOZ_UI_INVALID NS_DEFINE_EVENT_STATE_MACRO(13)
// Content could not be rendered (image/object/etc).
#define NS_EVENT_STATE_BROKEN NS_DEFINE_EVENT_STATE_MACRO(14)
// Content disabled by the user (images turned off, say).
#define NS_EVENT_STATE_USERDISABLED NS_DEFINE_EVENT_STATE_MACRO(15)
// Content suppressed by the user (ad blocking, etc).
#define NS_EVENT_STATE_SUPPRESSED NS_DEFINE_EVENT_STATE_MACRO(16)
// Content is still loading such that there is nothing to show the
// user (eg an image which hasn't started coming in yet).
#define NS_EVENT_STATE_LOADING NS_DEFINE_EVENT_STATE_MACRO(17)
// Handler for the content has been blocked.
#define NS_EVENT_STATE_HANDLER_BLOCKED NS_DEFINE_EVENT_STATE_MACRO(18)
// Handler for the content has been disabled.
#define NS_EVENT_STATE_HANDLER_DISABLED NS_DEFINE_EVENT_STATE_MACRO(19)
// Handler for the content has crashed
#define NS_EVENT_STATE_HANDLER_CRASHED NS_DEFINE_EVENT_STATE_MACRO(20)
// Content is required.
#define NS_EVENT_STATE_REQUIRED NS_DEFINE_EVENT_STATE_MACRO(21)
// Content is optional (and can be required).
#define NS_EVENT_STATE_OPTIONAL NS_DEFINE_EVENT_STATE_MACRO(22)
// Element is an unresolved custom element candidate
#define NS_EVENT_STATE_UNRESOLVED NS_DEFINE_EVENT_STATE_MACRO(23)
// Link has been visited.
#define NS_EVENT_STATE_VISITED NS_DEFINE_EVENT_STATE_MACRO(24)
// Link hasn't been visited.
#define NS_EVENT_STATE_UNVISITED NS_DEFINE_EVENT_STATE_MACRO(25)
// Drag is hovering over content.
#define NS_EVENT_STATE_DRAGOVER NS_DEFINE_EVENT_STATE_MACRO(26)
// Content value is in-range (and can be out-of-range).
#define NS_EVENT_STATE_INRANGE NS_DEFINE_EVENT_STATE_MACRO(27)
// Content value is out-of-range.
#define NS_EVENT_STATE_OUTOFRANGE NS_DEFINE_EVENT_STATE_MACRO(28)
// These two are temporary (see bug 302188)
// Content is read-only.
#define NS_EVENT_STATE_MOZ_READONLY NS_DEFINE_EVENT_STATE_MACRO(29)
// Content is editable.
#define NS_EVENT_STATE_MOZ_READWRITE NS_DEFINE_EVENT_STATE_MACRO(30)
// Content is the default one (meaning depends of the context).
#define NS_EVENT_STATE_DEFAULT NS_DEFINE_EVENT_STATE_MACRO(31)
// Content is a submit control and the form isn't valid.
#define NS_EVENT_STATE_MOZ_SUBMITINVALID NS_DEFINE_EVENT_STATE_MACRO(32)
// Content is in the optimum region.
#define NS_EVENT_STATE_OPTIMUM NS_DEFINE_EVENT_STATE_MACRO(33)
// Content is in the suboptimal region.
#define NS_EVENT_STATE_SUB_OPTIMUM NS_DEFINE_EVENT_STATE_MACRO(34)
// Content is in the sub-suboptimal region.
#define NS_EVENT_STATE_SUB_SUB_OPTIMUM NS_DEFINE_EVENT_STATE_MACRO(35)
// Element is highlighted (devtools inspector)
#define NS_EVENT_STATE_DEVTOOLS_HIGHLIGHTED NS_DEFINE_EVENT_STATE_MACRO(36)
// Element is transitioning for rules changed by style editor
#define NS_EVENT_STATE_STYLEEDITOR_TRANSITIONING NS_DEFINE_EVENT_STATE_MACRO(37)
#define NS_EVENT_STATE_INCREMENT_SCRIPT_LEVEL NS_DEFINE_EVENT_STATE_MACRO(38)
// Content has focus and should show a ring.
#define NS_EVENT_STATE_FOCUSRING NS_DEFINE_EVENT_STATE_MACRO(39)
// Handler for click to play plugin
#define NS_EVENT_STATE_TYPE_CLICK_TO_PLAY NS_DEFINE_EVENT_STATE_MACRO(40)
// Handler for click to play plugin (vulnerable w/update)
#define NS_EVENT_STATE_VULNERABLE_UPDATABLE NS_DEFINE_EVENT_STATE_MACRO(41)
// Handler for click to play plugin (vulnerable w/no update)
#define NS_EVENT_STATE_VULNERABLE_NO_UPDATE NS_DEFINE_EVENT_STATE_MACRO(42)
// Element has focus-within.
#define NS_EVENT_STATE_FOCUS_WITHIN NS_DEFINE_EVENT_STATE_MACRO(43)
// Element is ltr (for :dir pseudo-class)
#define NS_EVENT_STATE_LTR NS_DEFINE_EVENT_STATE_MACRO(44)
// Element is rtl (for :dir pseudo-class)
#define NS_EVENT_STATE_RTL NS_DEFINE_EVENT_STATE_MACRO(45)
// States for tracking the state of the "dir" attribute for HTML elements. We
// use these to avoid having to get "dir" attributes all the time during
// selector matching for some parts of the UA stylesheet.
//
// These states are externally managed, because we also don't want to keep
// getting "dir" attributes in IntrinsicState.
//
// Element is HTML and has a "dir" attibute. This state might go away depending
// on how https://github.com/whatwg/html/issues/2769 gets resolved. The value
// could be anything.
#define NS_EVENT_STATE_HAS_DIR_ATTR NS_DEFINE_EVENT_STATE_MACRO(46)
// Element is HTML, has a "dir" attribute, and the attribute's value is
// case-insensitively equal to "ltr".
#define NS_EVENT_STATE_DIR_ATTR_LTR NS_DEFINE_EVENT_STATE_MACRO(47)
// Element is HTML, has a "dir" attribute, and the attribute's value is
// case-insensitively equal to "rtl".
#define NS_EVENT_STATE_DIR_ATTR_RTL NS_DEFINE_EVENT_STATE_MACRO(48)
// Element is HTML, and is either a <bdi> element with no valid-valued "dir"
// attribute or any HTML element which has a "dir" attribute whose value is
// "auto".
#define NS_EVENT_STATE_DIR_ATTR_LIKE_AUTO NS_DEFINE_EVENT_STATE_MACRO(49)
// Element is filled by Autofill feature.
#define NS_EVENT_STATE_AUTOFILL NS_DEFINE_EVENT_STATE_MACRO(50)
// Element is filled with preview data by Autofill feature.
#define NS_EVENT_STATE_AUTOFILL_PREVIEW NS_DEFINE_EVENT_STATE_MACRO(51)
// Event state that is used for values that need to be parsed but do nothing.
#define NS_EVENT_STATE_IGNORE NS_DEFINE_EVENT_STATE_MACRO(63)
/**
* NOTE: do not go over 63 without updating EventStates::InternalType!
*/
#define DIRECTION_STATES (NS_EVENT_STATE_LTR | NS_EVENT_STATE_RTL)
#define DIR_ATTR_STATES (NS_EVENT_STATE_HAS_DIR_ATTR | \
NS_EVENT_STATE_DIR_ATTR_LTR | \
NS_EVENT_STATE_DIR_ATTR_RTL | \
NS_EVENT_STATE_DIR_ATTR_LIKE_AUTO)
#define DISABLED_STATES (NS_EVENT_STATE_DISABLED | NS_EVENT_STATE_ENABLED)
#define REQUIRED_STATES (NS_EVENT_STATE_REQUIRED | NS_EVENT_STATE_OPTIONAL)
// Event states that can be added and removed through
// Element::{Add,Remove}ManuallyManagedStates.
//
// Take care when manually managing state bits. You are responsible for
// setting or clearing the bit when an Element is added or removed from a
// document (e.g. in BindToTree and UnbindFromTree), if that is an
// appropriate thing to do for your state bit.
#define MANUALLY_MANAGED_STATES ( \
NS_EVENT_STATE_AUTOFILL | \
NS_EVENT_STATE_AUTOFILL_PREVIEW \
)
// Event states that are managed externally to an element (by the
// EventStateManager, or by other code). As opposed to those in
// INTRINSIC_STATES, which are are computed by the element itself
// and returned from Element::IntrinsicState.
#define EXTERNALLY_MANAGED_STATES ( \
MANUALLY_MANAGED_STATES | \
DIR_ATTR_STATES | \
DISABLED_STATES | \
REQUIRED_STATES | \
NS_EVENT_STATE_ACTIVE | \
NS_EVENT_STATE_DRAGOVER | \
NS_EVENT_STATE_FOCUS | \
NS_EVENT_STATE_FOCUSRING | \
NS_EVENT_STATE_FOCUS_WITHIN | \
NS_EVENT_STATE_FULL_SCREEN | \
NS_EVENT_STATE_HOVER | \
NS_EVENT_STATE_UNRESOLVED | \
NS_EVENT_STATE_URLTARGET \
)
#define INTRINSIC_STATES (~EXTERNALLY_MANAGED_STATES)
#endif // mozilla_EventStates_h_