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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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
#ifndef nsCoreUtils_h_
#define nsCoreUtils_h_
#include "AttrArray.h"
#include "mozilla/EventForwards.h"
#include "nsCaseTreatment.h"
#include "nsIAccessibleEvent.h"
#include "nsIContent.h"
#include "mozilla/FlushType.h"
#include "mozilla/PresShellForwards.h"
#include "nsPoint.h"
#include "nsTArray.h"
#include "Units.h"
class nsAttrValue;
class nsGenericHTMLElement;
class nsRange;
class nsTreeColumn;
class nsIFrame;
class nsIDocShell;
class nsIWidget;
namespace mozilla {
class PresShell;
namespace dom {
class Document;
class Element;
class XULTreeElement;
} // namespace dom
} // namespace mozilla
/**
* Core utils.
*/
class nsCoreUtils {
public:
typedef mozilla::PresShell PresShell;
typedef mozilla::dom::Document Document;
typedef mozilla::dom::Element Element;
/**
* Return true if the given node is a label of a control.
*/
static bool IsLabelWithControl(nsIContent* aContent);
/**
* Return true if the given node has registered click, mousedown or mouseup
* event listeners.
*/
static bool HasClickListener(nsIContent* aContent);
/**
* Dispatch click event to XUL tree cell.
*
* @param aTree [in] tree
* @param aRowIndex [in] row index
* @param aColumn [in] column object
* @param aPseudoElm [in] pseudo element inside the cell, see
* XULTreeElement for available values
*/
MOZ_CAN_RUN_SCRIPT
static void DispatchClickEvent(mozilla::dom::XULTreeElement* aTree,
int32_t aRowIndex, nsTreeColumn* aColumn,
const nsAString& aPseudoElt = u""_ns);
/**
* Send mouse event to the given element.
*
* @param aMessage [in] an event message (see EventForwards.h)
* @param aX [in] x coordinate in dev pixels
* @param aY [in] y coordinate in dev pixels
* @param aContent [in] the element
* @param aFrame [in] frame of the element
* @param aPresShell [in] the presshell for the element
* @param aRootWidget [in] the root widget of the element
*/
MOZ_CAN_RUN_SCRIPT
static void DispatchMouseEvent(mozilla::EventMessage aMessage, int32_t aX,
int32_t aY, nsIContent* aContent,
nsIFrame* aFrame, PresShell* aPresShell,
nsIWidget* aRootWidget);
/**
* Send a touch event with a single touch point to the given element.
*
* @param aMessage [in] an event message (see EventForwards.h)
* @param aX [in] x coordinate in dev pixels
* @param aY [in] y coordinate in dev pixels
* @param aContent [in] the element
* @param aFrame [in] frame of the element
* @param aPresShell [in] the presshell for the element
* @param aRootWidget [in] the root widget of the element
*/
MOZ_CAN_RUN_SCRIPT
static void DispatchTouchEvent(mozilla::EventMessage aMessage, int32_t aX,
int32_t aY, nsIContent* aContent,
nsIFrame* aFrame, PresShell* aPresShell,
nsIWidget* aRootWidget);
/**
* Return an accesskey registered on the given element by
* EventStateManager or 0 if there is no registered accesskey.
*
* @param aContent - the given element.
*/
static uint32_t GetAccessKeyFor(nsIContent* aContent);
/**
* Return DOM element related with the given node, i.e.
* a) itself if it is DOM element
* b) parent element if it is text node
* c) otherwise nullptr
*
* @param aNode [in] the given DOM node
*/
static nsIContent* GetDOMElementFor(nsIContent* aContent);
/**
* Return DOM node for the given DOM point.
*/
static nsINode* GetDOMNodeFromDOMPoint(nsINode* aNode, uint32_t aOffset);
/**
* Is the first passed in node an ancestor of the second?
* Note: A node is not considered to be the ancestor of itself.
*
* @param aPossibleAncestorNode [in] node to test for ancestor-ness of
* aPossibleDescendantNode
* @param aPossibleDescendantNode [in] node to test for descendant-ness of
* aPossibleAncestorNode
* @param aRootNode [in, optional] the root node that search
* search should be performed within
* @return true if aPossibleAncestorNode is an ancestor of
* aPossibleDescendantNode
*/
static bool IsAncestorOf(nsINode* aPossibleAncestorNode,
nsINode* aPossibleDescendantNode,
nsINode* aRootNode = nullptr);
/**
* Helper method to scroll range into view, used for implementation of
* nsIAccessibleText::scrollSubstringTo().
*
* @param aFrame the frame for accessible the range belongs to.
* @param aRange the range to scroll to
* @param aScrollType the place a range should be scrolled to
*/
MOZ_CAN_RUN_SCRIPT_BOUNDARY static nsresult ScrollSubstringTo(
nsIFrame* aFrame, nsRange* aRange, uint32_t aScrollType);
/** Helper method to scroll range into view, used for implementation of
* nsIAccessibleText::scrollSubstringTo[Point]().
*
* @param aFrame the frame for accessible the range belongs to.
* @param aRange the range to scroll to
* @param aVertical how to align vertically, specified in percents, and
* when.
* @param aHorizontal how to align horizontally, specified in percents,
* and when.
*/
MOZ_CAN_RUN_SCRIPT_BOUNDARY static nsresult ScrollSubstringTo(
nsIFrame* aFrame, nsRange* aRange, mozilla::ScrollAxis aVertical,
mozilla::ScrollAxis aHorizontal);
/**
* Scrolls the given frame to the point, used for implememntation of
* nsIAccessible::scrollToPoint and nsIAccessibleText::scrollSubstringToPoint.
*
* @param aScrollContainerFrame the scroll container frame
* @param aFrame the frame to scroll
* @param aPoint the point scroll to (in dev pixels)
*/
static void ScrollFrameToPoint(nsIFrame* aScrollContainerFrame,
nsIFrame* aFrame,
const mozilla::LayoutDeviceIntPoint& aPoint);
/**
* Converts scroll type constant defined in nsIAccessibleScrollType to
* vertical and horizontal parameters.
*/
static void ConvertScrollTypeToPercents(uint32_t aScrollType,
mozilla::ScrollAxis* aVertical,
mozilla::ScrollAxis* aHorizontal);
/**
* Return document shell for the given DOM node.
*/
static already_AddRefed<nsIDocShell> GetDocShellFor(nsINode* aNode);
/**
* Return true if the given document is root document.
*/
static bool IsRootDocument(Document* aDocument);
/**
* Return true if the given document is a top level content document in this
* process.
* This will be true for tab documents and out-of-process iframe documents.
*/
static bool IsTopLevelContentDocInProcess(Document* aDocumentNode);
/**
* Return true if the given document is an error page.
*/
static bool IsErrorPage(Document* aDocument);
/**
* Return presShell for the document containing the given DOM node.
*/
static PresShell* GetPresShellFor(nsINode* aNode);
/**
* Get the ID for an element, in some types of XML this may not be the ID
* attribute
* @param aContent Node to get the ID for
* @param aID Where to put ID string
* @return true if there is an ID set for this node
*/
static bool GetID(nsIContent* aContent, nsAString& aID);
/**
* Convert attribute value of the given node to positive integer. If no
* attribute or wrong value then false is returned.
*/
static bool GetUIntAttr(nsIContent* aContent, nsAtom* aAttr, int32_t* aUInt);
static bool GetUIntAttrValue(const nsAttrValue* aVal, int32_t* aUInt);
/**
* Returns language for the given node.
*
* @param aContent [in] the given node
* @param aRootContent [in] container of the given node
* @param aLanguage [out] language
*/
static void GetLanguageFor(nsIContent* aContent, nsIContent* aRootContent,
nsAString& aLanguage);
/**
* Return tree from any levels DOMNode under the XUL tree.
*/
static mozilla::dom::XULTreeElement* GetTree(nsIContent* aContent);
/**
* Return first sensible column for the given tree box object.
*/
static already_AddRefed<nsTreeColumn> GetFirstSensibleColumn(
mozilla::dom::XULTreeElement* aTree,
mozilla::FlushType = mozilla::FlushType::Frames);
/**
* Return sensible columns count for the given tree box object.
*/
static uint32_t GetSensibleColumnCount(mozilla::dom::XULTreeElement* aTree);
/**
* Return sensible column at the given index for the given tree box object.
*/
static already_AddRefed<nsTreeColumn> GetSensibleColumnAt(
mozilla::dom::XULTreeElement* aTree, uint32_t aIndex);
/**
* Return next sensible column for the given column.
*/
static already_AddRefed<nsTreeColumn> GetNextSensibleColumn(
nsTreeColumn* aColumn);
/**
* Return previous sensible column for the given column.
*/
static already_AddRefed<nsTreeColumn> GetPreviousSensibleColumn(
nsTreeColumn* aColumn);
/**
* Return true if the given column is hidden (i.e. not sensible).
*/
static bool IsColumnHidden(nsTreeColumn* aColumn);
/**
* Scroll content into view.
*/
MOZ_CAN_RUN_SCRIPT
static void ScrollTo(PresShell* aPresShell, nsIContent* aContent,
uint32_t aScrollType);
/**
* Return true if the given node is table header element.
*/
static bool IsHTMLTableHeader(nsIContent* aContent);
/**
* Returns true if the given string is empty or contains whitespace symbols
* only. In contrast to nsWhitespaceTokenizer class it takes into account
* non-breaking space (0xa0).
*/
static bool IsWhitespaceString(const nsAString& aString);
/**
* Returns true if the given character is whitespace symbol.
*/
static bool IsWhitespace(char16_t aChar) {
return aChar == ' ' || aChar == '\n' || aChar == '\r' || aChar == '\t' ||
aChar == 0xa0;
}
/*
* Return true if there are any observers of accessible events.
*/
static bool AccEventObserversExist();
/**
* Notify accessible event observers of an event.
*/
static void DispatchAccEvent(RefPtr<nsIAccessibleEvent> aEvent);
static bool IsDisplayContents(nsIContent* aContent);
static bool CanCreateAccessibleWithoutFrame(nsIContent* aContent);
/**
* Return whether the document and all its in-process ancestors are visible in
* the sense of pageshow / hide.
*/
static bool IsDocumentVisibleConsideringInProcessAncestors(
const Document* aDocument);
/**
* Return true if `aDescendant` is a descendant of any of `aStartAncestor`'s
* shadow-including ancestors.
*/
static bool IsDescendantOfAnyShadowIncludingAncestor(nsINode* aDescendant,
nsINode* aStartAncestor);
static Element* GetAriaActiveDescendantElement(Element* aElement);
/**
* Return true if the given text frame is 0 width whitespace before a hard
* line break. This is not visible and is semantically irrelevant. This can
* happen if there is whitespace before an invisible element at the end of a
* block. For example:
* <div><span>a</span> <span hidden>b</span></div>
* This results in a text node for "a" and a text node for " ". This function
* will return true for the latter node.
*/
static bool IsTrimmedWhitespaceBeforeHardLineBreak(nsIFrame* aFrame);
static bool IsPseudoElement(nsIContent* aContent) {
return aContent->IsGeneratedContentContainerForBefore() ||
aContent->IsGeneratedContentContainerForAfter() ||
aContent->IsGeneratedContentContainerForMarker();
}
/**
* Return the anchor frame for the given CSS positioned frame, or null if:
* 1. there is none,
* 2. there is more than one anchor,
* 3. or, there is one or more anchor used for sizing/margin only.
*/
static const nsIFrame* GetAnchorForPositionedFrame(
const PresShell* aPresShell, const nsIFrame* aPositionedFrame);
/**
* Return the CSS positioned frame for the given anchor frame, or null if:
* 1. there is none,
* 2. the anchor has more than one positioned frame,
* 3. or, there is one or more positioned frame using this anchor for
* sizing/margin only.
*/
static nsIFrame* GetPositionedFrameForAnchor(const PresShell* aPresShell,
const nsIFrame* aAnchorFrame);
};
#endif