gecko/content/events/public/nsEventStates.h

273 lines
10 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla code.
*
* The Initial Developer of the Original Code is Mozilla Foundation
* Portions created by the Initial Developer are Copyright (C) 2010
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Mounir Lamouri <mounir.lamouri@mozilla.com> (original author)
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef nsEventStates_h__
#define nsEventStates_h__
#include "nsDebug.h"
/**
* nsEventStates 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 nsEventStates
{
public:
typedef PRUint64 InternalType;
nsEventStates()
: 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
// nsEventStates instances with mStates set to something else than 0.
// Unfortunately, this constructor is needed at at least two places now.
explicit nsEventStates(InternalType aStates)
: mStates(aStates)
{ }
nsEventStates(const nsEventStates& aEventStates) {
mStates = aEventStates.mStates;
}
nsEventStates& operator=(const nsEventStates& aEventStates) {
mStates = aEventStates.mStates;
return *this;
}
nsEventStates operator|(const nsEventStates& aEventStates) const {
return nsEventStates(mStates | aEventStates.mStates);
}
nsEventStates& operator|=(const nsEventStates& 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.
nsEventStates operator&(const nsEventStates& aEventStates) const {
return nsEventStates(mStates & aEventStates.mStates);
}
nsEventStates& operator&=(const nsEventStates& aEventStates) {
mStates &= aEventStates.mStates;
return *this;
}
bool operator==(const nsEventStates& aEventStates) const {
return mStates == aEventStates.mStates;
}
bool operator!=(const nsEventStates& aEventStates) const {
return mStates != aEventStates.mStates;
}
nsEventStates operator~() const {
return nsEventStates(~mStates);
}
nsEventStates operator^(const nsEventStates& aEventStates) const {
return nsEventStates(mStates ^ aEventStates.mStates);
}
nsEventStates& operator^=(const nsEventStates& aEventStates) {
mStates ^= aEventStates.mStates;
return *this;
}
/**
* Returns true if the nsEventStates instance is empty.
* A nsEventStates 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 nsEventStates 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(nsEventStates 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, "
"nsEventStates object has to contain only one state!");
}
#endif // DEBUG
return mStates & aEventStates.mStates;
}
/**
* Returns true if the nsEventStates 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(nsEventStates aEventStates) const {
return mStates & aEventStates.mStates;
}
/**
* Returns true if the nsEventStates instance contains all states
* contained in aEventStates.
*
* @param aEventStates The states to check.
*
* @return Whether the object has all states from aEventStates
*/
bool HasAllStates(nsEventStates 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;
}
private:
InternalType mStates;
};
/**
* The following macros are creating nsEventStates instance with different
* values depending of their meaning.
* Ideally, nsEventStates instance with values different than 0 should only be
* created that way.
*/
// Helper to define a new nsEventStates macro.
#define NS_DEFINE_EVENT_STATE_MACRO(_val) \
(nsEventStates(nsEventStates::InternalType(1) << _val))
// 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)
// Drag is hovering over content.
#define NS_EVENT_STATE_DRAGOVER NS_DEFINE_EVENT_STATE_MACRO(3)
// Content is URL's target (ref).
#define NS_EVENT_STATE_URLTARGET NS_DEFINE_EVENT_STATE_MACRO(4)
// Content is checked.
#define NS_EVENT_STATE_CHECKED NS_DEFINE_EVENT_STATE_MACRO(5)
// Content is enabled (and can be disabled).
#define NS_EVENT_STATE_ENABLED NS_DEFINE_EVENT_STATE_MACRO(6)
// Content is disabled.
#define NS_EVENT_STATE_DISABLED NS_DEFINE_EVENT_STATE_MACRO(7)
// Content is required.
#define NS_EVENT_STATE_REQUIRED NS_DEFINE_EVENT_STATE_MACRO(8)
// Content is optional (and can be required).
#define NS_EVENT_STATE_OPTIONAL NS_DEFINE_EVENT_STATE_MACRO(9)
// Link has been visited.
#define NS_EVENT_STATE_VISITED NS_DEFINE_EVENT_STATE_MACRO(10)
// Link hasn't been visited.
#define NS_EVENT_STATE_UNVISITED NS_DEFINE_EVENT_STATE_MACRO(11)
// Content is valid (and can be invalid).
#define NS_EVENT_STATE_VALID NS_DEFINE_EVENT_STATE_MACRO(12)
// Content is invalid.
#define NS_EVENT_STATE_INVALID NS_DEFINE_EVENT_STATE_MACRO(13)
// Content value is in-range (and can be out-of-range).
#define NS_EVENT_STATE_INRANGE NS_DEFINE_EVENT_STATE_MACRO(14)
// Content value is out-of-range.
#define NS_EVENT_STATE_OUTOFRANGE NS_DEFINE_EVENT_STATE_MACRO(15)
// These two are temporary (see bug 302188)
// Content is read-only.
#define NS_EVENT_STATE_MOZ_READONLY NS_DEFINE_EVENT_STATE_MACRO(16)
// Content is editable.
#define NS_EVENT_STATE_MOZ_READWRITE NS_DEFINE_EVENT_STATE_MACRO(17)
// Content is the default one (meaning depends of the context).
#define NS_EVENT_STATE_DEFAULT NS_DEFINE_EVENT_STATE_MACRO(18)
// Content could not be rendered (image/object/etc).
#define NS_EVENT_STATE_BROKEN NS_DEFINE_EVENT_STATE_MACRO(19)
// Content disabled by the user (images turned off, say).
#define NS_EVENT_STATE_USERDISABLED NS_DEFINE_EVENT_STATE_MACRO(20)
// Content suppressed by the user (ad blocking, etc).
#define NS_EVENT_STATE_SUPPRESSED NS_DEFINE_EVENT_STATE_MACRO(21)
// 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(22)
// Content is of a type that gecko can't handle.
#define NS_EVENT_STATE_TYPE_UNSUPPORTED NS_DEFINE_EVENT_STATE_MACRO(23)
#ifdef MOZ_MATHML
#define NS_EVENT_STATE_INCREMENT_SCRIPT_LEVEL NS_DEFINE_EVENT_STATE_MACRO(24)
#endif
// Handler for the content has been blocked.
#define NS_EVENT_STATE_HANDLER_BLOCKED NS_DEFINE_EVENT_STATE_MACRO(25)
// Handler for the content has been disabled.
#define NS_EVENT_STATE_HANDLER_DISABLED NS_DEFINE_EVENT_STATE_MACRO(26)
// Content is in the indeterminate state.
#define NS_EVENT_STATE_INDETERMINATE NS_DEFINE_EVENT_STATE_MACRO(27)
// Handler for the content has crashed
#define NS_EVENT_STATE_HANDLER_CRASHED NS_DEFINE_EVENT_STATE_MACRO(28)
// Content has focus and should show a ring.
#define NS_EVENT_STATE_FOCUSRING NS_DEFINE_EVENT_STATE_MACRO(29)
// Content shows its placeholder
#define NS_EVENT_STATE_MOZ_PLACEHOLDER NS_DEFINE_EVENT_STATE_MACRO(30)
// Content is a submit control and the form isn't valid.
#define NS_EVENT_STATE_MOZ_SUBMITINVALID NS_DEFINE_EVENT_STATE_MACRO(31)
// UI friendly version of :invalid pseudo-class.
#define NS_EVENT_STATE_MOZ_UI_INVALID NS_DEFINE_EVENT_STATE_MACRO(32)
// UI friendly version of :valid pseudo-class.
#define NS_EVENT_STATE_MOZ_UI_VALID NS_DEFINE_EVENT_STATE_MACRO(33)
/**
* NOTE: do not go over 63 without updating nsEventStates::InternalType!
*/
#endif // nsEventStates_h__