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/* 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/. */
#include "HTMLEditor.h"
#include "HTMLEditUtils.h"
#include "mozilla/Attributes.h"
#include "mozilla/PresShell.h"
#include "mozilla/PresShellInlines.h"
#include "mozilla/dom/BindContext.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/EventTarget.h"
#include "mozilla/mozalloc.h"
#include "nsAString.h"
#include "nsCOMPtr.h"
#include "nsComputedDOMStyle.h"
#include "nsDebug.h"
#include "nsError.h"
#include "nsGenericHTMLElement.h"
#include "nsGkAtoms.h"
#include "nsAtom.h"
#include "nsIContent.h"
#include "nsID.h"
#include "mozilla/dom/Document.h"
#include "nsIDocumentObserver.h"
#include "nsStubMutationObserver.h"
#include "nsINode.h"
#include "nsISupportsImpl.h"
#include "nsISupportsUtils.h"
#include "nsLiteralString.h"
#include "nsPresContext.h"
#include "nsReadableUtils.h"
#include "nsString.h"
#include "nsStringFwd.h"
#include "nsStyledElement.h"
#include "nsUnicharUtils.h"
#include "nscore.h"
#include "nsContentUtils.h" // for nsAutoScriptBlocker
#include "nsROCSSPrimitiveValue.h"
class nsIDOMEventListener;
namespace mozilla {
using namespace dom;
// Retrieve the rounded number of CSS pixels from a computed CSS property.
//
// Note that this should only be called for properties whose resolved value
// is CSS pixels (like width, height, left, top, right, bottom, margin, padding,
// border-*-width, ...).
//
static int32_t GetCSSFloatValue(nsComputedDOMStyle* aComputedStyle,
const nsACString& aProperty) {
MOZ_ASSERT(aComputedStyle);
// get the computed CSSValue of the property
nsAutoCString value;
nsresult rv = aComputedStyle->GetPropertyValue(aProperty, value);
if (NS_FAILED(rv)) {
NS_WARNING("nsComputedDOMStyle::GetPropertyValue() failed");
return 0;
}
// We only care about resolved values, not a big deal if the element is
// undisplayed, for example, and the value is "auto" or what not.
int32_t val = value.ToInteger(&rv);
NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "nsAString::ToInteger() failed");
return NS_SUCCEEDED(rv) ? val : 0;
}
class ElementDeletionObserver final : public nsStubMutationObserver {
public:
ElementDeletionObserver(nsIContent* aNativeAnonNode,
Element* aObservedElement)
: mNativeAnonNode(aNativeAnonNode), mObservedElement(aObservedElement) {}
NS_DECL_ISUPPORTS
NS_DECL_NSIMUTATIONOBSERVER_PARENTCHAINCHANGED
NS_DECL_NSIMUTATIONOBSERVER_NODEWILLBEDESTROYED
protected:
~ElementDeletionObserver() = default;
nsIContent* mNativeAnonNode;
Element* mObservedElement;
};
NS_IMPL_ISUPPORTS(ElementDeletionObserver, nsIMutationObserver)
void ElementDeletionObserver::ParentChainChanged(nsIContent* aContent) {
// If the native anonymous content has been unbound already in
// DeleteRefToAnonymousNode, mNativeAnonNode's parentNode is null.
if (aContent != mObservedElement || !mNativeAnonNode ||
mNativeAnonNode->GetParent() != aContent) {
return;
}
ManualNACPtr::RemoveContentFromNACArray(mNativeAnonNode);
mObservedElement->RemoveMutationObserver(this);
mObservedElement = nullptr;
mNativeAnonNode->RemoveMutationObserver(this);
mNativeAnonNode = nullptr;
NS_RELEASE_THIS();
}
void ElementDeletionObserver::NodeWillBeDestroyed(const nsINode* aNode) {
NS_ASSERTION(aNode == mNativeAnonNode || aNode == mObservedElement,
"Wrong aNode!");
if (aNode == mNativeAnonNode) {
mObservedElement->RemoveMutationObserver(this);
mObservedElement = nullptr;
} else {
mNativeAnonNode->RemoveMutationObserver(this);
mNativeAnonNode->UnbindFromTree();
mNativeAnonNode = nullptr;
}
NS_RELEASE_THIS();
}
ManualNACPtr HTMLEditor::CreateAnonymousElement(nsAtom* aTag,
nsIContent& aParentContent,
const nsAString& aAnonClass,
bool aIsCreatedHidden) {
// Don't put anonymous editor element into non-HTML element.
// It is mainly for avoiding other anonymous element being inserted
// into <svg:use>, but in general we probably don't want to insert
// some random HTML anonymous element into a non-HTML element.
if (!aParentContent.IsHTMLElement()) {
return nullptr;
}
if (NS_WARN_IF(!GetDocument())) {
return nullptr;
}
RefPtr<PresShell> presShell = GetPresShell();
if (NS_WARN_IF(!presShell)) {
return nullptr;
}
// Create a new node through the element factory
RefPtr<Element> newElement = CreateHTMLContent(aTag);
if (!newElement) {
NS_WARNING("EditorBase::CreateHTMLContent() failed");
return nullptr;
}
// add the "hidden" class if needed
if (aIsCreatedHidden) {
nsresult rv = newElement->SetAttr(kNameSpaceID_None, nsGkAtoms::_class,
u"hidden"_ns, true);
if (NS_FAILED(rv)) {
NS_WARNING("Element::SetAttr(nsGkAtoms::_class, hidden) failed");
return nullptr;
}
}
// add an _moz_anonclass attribute if needed
if (!aAnonClass.IsEmpty()) {
nsresult rv = newElement->SetAttr(
kNameSpaceID_None, nsGkAtoms::_moz_anonclass, aAnonClass, true);
if (NS_FAILED(rv)) {
NS_WARNING("Element::SetAttr(nsGkAtoms::_moz_anonclass) failed");
return nullptr;
}
}
{
nsAutoScriptBlocker scriptBlocker;
// establish parenthood of the element
newElement->SetIsNativeAnonymousRoot();
BindContext context(*aParentContent.AsElement(),
BindContext::ForNativeAnonymous);
nsresult rv = newElement->BindToTree(context, aParentContent);
if (NS_FAILED(rv)) {
NS_WARNING("Element::BindToTree(BindContext::ForNativeAnonymous) failed");
newElement->UnbindFromTree();
return nullptr;
}
}
ManualNACPtr newNativeAnonymousContent(newElement.forget());
// Must style the new element, otherwise the PostRecreateFramesFor call
// below will do nothing.
ServoStyleSet* styleSet = presShell->StyleSet();
// Sometimes editor likes to append anonymous content to elements
// in display:none subtrees, so avoid styling in those cases.
if (ServoStyleSet::MayTraverseFrom(newNativeAnonymousContent)) {
styleSet->StyleNewSubtree(newNativeAnonymousContent);
}
auto* observer = new ElementDeletionObserver(newNativeAnonymousContent,
aParentContent.AsElement());
NS_ADDREF(observer); // NodeWillBeDestroyed releases.
aParentContent.AddMutationObserver(observer);
newNativeAnonymousContent->AddMutationObserver(observer);
#ifdef DEBUG
// Editor anonymous content gets passed to PostRecreateFramesFor... which
// can't _really_ deal with anonymous content (because it can't get the frame
// tree ordering right). But for us the ordering doesn't matter so this is
// sort of ok.
newNativeAnonymousContent->SetProperty(nsGkAtoms::restylableAnonymousNode,
reinterpret_cast<void*>(true));
#endif // DEBUG
// display the element
presShell->PostRecreateFramesFor(newNativeAnonymousContent);
return newNativeAnonymousContent;
}
// Removes event listener and calls DeleteRefToAnonymousNode.
void HTMLEditor::RemoveListenerAndDeleteRef(const nsAString& aEvent,
nsIDOMEventListener* aListener,
bool aUseCapture,
ManualNACPtr aElement,
PresShell* aPresShell) {
if (aElement) {
aElement->RemoveEventListener(aEvent, aListener, aUseCapture);
}
DeleteRefToAnonymousNode(std::move(aElement), aPresShell);
}
// Deletes all references to an anonymous element
void HTMLEditor::DeleteRefToAnonymousNode(ManualNACPtr aContent,
PresShell* aPresShell) {
// call ContentRemoved() for the anonymous content
// node so its references get removed from the frame manager's
// undisplay map, and its layout frames get destroyed!
if (NS_WARN_IF(!aContent)) {
return;
}
if (NS_WARN_IF(!aContent->GetParent())) {
// aContent was already removed?
return;
}
nsAutoScriptBlocker scriptBlocker;
// Need to check whether aPresShell has been destroyed (but not yet deleted).
// See bug 338129.
if (aContent->IsInComposedDoc() && aPresShell &&
!aPresShell->IsDestroying()) {
MOZ_ASSERT(aContent->IsRootOfNativeAnonymousSubtree());
MOZ_ASSERT(!aContent->GetPreviousSibling(), "NAC has no siblings");
// FIXME(emilio): This is the only caller to PresShell::ContentRemoved that
// passes NAC into it. This is not great!
aPresShell->ContentRemoved(aContent, nullptr);
}
// The ManualNACPtr destructor will invoke UnbindFromTree.
}
void HTMLEditor::HideAnonymousEditingUIs() {
if (mAbsolutelyPositionedObject) {
HideGrabberInternal();
NS_ASSERTION(!mAbsolutelyPositionedObject,
"HTMLEditor::HideGrabberInternal() failed, but ignored");
}
if (mInlineEditedCell) {
HideInlineTableEditingUIInternal();
NS_ASSERTION(
!mInlineEditedCell,
"HTMLEditor::HideInlineTableEditingUIInternal() failed, but ignored");
}
if (mResizedObject) {
DebugOnly<nsresult> rvIgnored = HideResizersInternal();
NS_WARNING_ASSERTION(
NS_SUCCEEDED(rvIgnored),
"HTMLEditor::HideResizersInternal() failed, but ignored");
NS_ASSERTION(!mResizedObject,
"HTMLEditor::HideResizersInternal() failed, but ignored");
}
}
void HTMLEditor::HideAnonymousEditingUIsIfUnnecessary() {
// XXX Perhaps, this is wrong approach to hide multiple UIs because
// hiding one UI may causes overwriting existing UI with newly
// created one. In such case, we will leak ovewritten UI.
if (!IsAbsolutePositionEditorEnabled() && mAbsolutelyPositionedObject) {
// XXX If we're moving something, we need to cancel or commit the
// operation now.
HideGrabberInternal();
NS_ASSERTION(!mAbsolutelyPositionedObject,
"HTMLEditor::HideGrabberInternal() failed, but ignored");
}
if (!IsInlineTableEditorEnabled() && mInlineEditedCell) {
// XXX If we're resizing a table element, we need to cancel or commit the
// operation now.
HideInlineTableEditingUIInternal();
NS_ASSERTION(
!mInlineEditedCell,
"HTMLEditor::HideInlineTableEditingUIInternal() failed, but ignored");
}
if (!IsObjectResizerEnabled() && mResizedObject) {
// XXX If we're resizing something, we need to cancel or commit the
// operation now.
DebugOnly<nsresult> rvIgnored = HideResizersInternal();
NS_WARNING_ASSERTION(
NS_SUCCEEDED(rvIgnored),
"HTMLEditor::HideResizersInternal() failed, but ignored");
NS_ASSERTION(!mResizedObject,
"HTMLEditor::HideResizersInternal() failed, but ignored");
}
}
NS_IMETHODIMP HTMLEditor::CheckSelectionStateForAnonymousButtons() {
AutoEditActionDataSetter editActionData(*this, EditAction::eNotEditing);
if (NS_WARN_IF(!editActionData.CanHandle())) {
return NS_ERROR_NOT_INITIALIZED;
}
nsresult rv = RefreshEditingUI();
NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
"HTMLEditor::RefereshEditingUI() failed");
return EditorBase::ToGenericNSResult(rv);
}
nsresult HTMLEditor::RefreshEditingUI() {
MOZ_ASSERT(IsEditActionDataAvailable());
// First, we need to remove unnecessary editing UI now since some of them
// may be disabled while them are visible.
HideAnonymousEditingUIsIfUnnecessary();
// early way out if all contextual UI extensions are disabled
if (!IsObjectResizerEnabled() && !IsAbsolutePositionEditorEnabled() &&
!IsInlineTableEditorEnabled()) {
return NS_OK;
}
// Don't change selection state if we're moving.
if (mIsMoving) {
return NS_OK;
}
// let's get the containing element of the selection
RefPtr<Element> selectionContainerElement = GetSelectionContainerElement();
if (NS_WARN_IF(!selectionContainerElement)) {
return NS_OK;
}
// If we're not in a document, don't try to add resizers
if (!selectionContainerElement->IsInUncomposedDoc()) {
return NS_OK;
}
// what's its tag?
RefPtr<Element> focusElement = std::move(selectionContainerElement);
nsAtom* focusTagAtom = focusElement->NodeInfo()->NameAtom();
RefPtr<Element> absPosElement;
if (IsAbsolutePositionEditorEnabled()) {
// Absolute Positioning support is enabled, is the selection contained
// in an absolutely positioned element ?
absPosElement = GetAbsolutelyPositionedSelectionContainer();
if (NS_WARN_IF(Destroyed())) {
return NS_ERROR_EDITOR_DESTROYED;
}
}
RefPtr<Element> cellElement;
if (IsObjectResizerEnabled() || IsInlineTableEditorEnabled()) {
// Resizing or Inline Table Editing is enabled, we need to check if the
// selection is contained in a table cell
cellElement = GetInclusiveAncestorByTagNameAtSelection(*nsGkAtoms::td);
}
if (IsObjectResizerEnabled() && cellElement) {
// we are here because Resizing is enabled AND selection is contained in
// a cell
// get the enclosing table
if (nsGkAtoms::img != focusTagAtom) {
// the element container of the selection is not an image, so we'll show
// the resizers around the table
// XXX There may be a bug. cellElement may be not in <table> in invalid
// tree. So, perhaps, GetClosestAncestorTableElement() returns
// nullptr, we should not set focusTagAtom to nsGkAtoms::table.
focusElement =
HTMLEditUtils::GetClosestAncestorTableElement(*cellElement);
focusTagAtom = nsGkAtoms::table;
}
}
// we allow resizers only around images, tables, and absolutely positioned
// elements. If we don't have image/table, let's look at the latter case.
if (nsGkAtoms::img != focusTagAtom && nsGkAtoms::table != focusTagAtom) {
focusElement = absPosElement;
}
// at this point, focusElement contains the element for Resizing,
// cellElement contains the element for InlineTableEditing
// absPosElement contains the element for Positioning
// Note: All the Hide/Show methods below may change attributes on real
// content which means a DOMAttrModified handler may cause arbitrary
// side effects while this code runs (bug 420439).
if (IsAbsolutePositionEditorEnabled() && mAbsolutelyPositionedObject &&
absPosElement != mAbsolutelyPositionedObject) {
HideGrabberInternal();
NS_ASSERTION(!mAbsolutelyPositionedObject,
"HTMLEditor::HideGrabberInternal() failed, but ignored");
}
if (IsObjectResizerEnabled() && mResizedObject &&
mResizedObject != focusElement) {
// Perhaps, even if HideResizersInternal() failed, we should try to hide
// inline table editing UI. However, it returns error only when we cannot
// do anything. So, it's okay for now.
nsresult rv = HideResizersInternal();
if (NS_FAILED(rv)) {
NS_WARNING("HTMLEditor::HideResizersInternal() failed");
return rv;
}
NS_ASSERTION(!mResizedObject,
"HTMLEditor::HideResizersInternal() failed, but ignored");
}
if (IsInlineTableEditorEnabled() && mInlineEditedCell &&
mInlineEditedCell != cellElement) {
HideInlineTableEditingUIInternal();
NS_ASSERTION(
!mInlineEditedCell,
"HTMLEditor::HideInlineTableEditingUIInternal failed, but ignored");
}
// now, let's display all contextual UI for good
nsIContent* hostContent = GetActiveEditingHost();
if (IsObjectResizerEnabled() && focusElement &&
HTMLEditUtils::IsSimplyEditableNode(*focusElement) &&
focusElement != hostContent) {
if (nsGkAtoms::img == focusTagAtom) {
mResizedObjectIsAnImage = true;
}
if (mResizedObject) {
nsresult rv = RefreshResizersInternal();
if (NS_FAILED(rv)) {
NS_WARNING("HTMLEditor::RefreshResizersInternal() failed");
return rv;
}
} else {
nsresult rv = ShowResizersInternal(*focusElement);
if (NS_FAILED(rv)) {
NS_WARNING("HTMLEditor::ShowResizersInternal() failed");
return rv;
}
}
}
if (IsAbsolutePositionEditorEnabled() && absPosElement &&
HTMLEditUtils::IsSimplyEditableNode(*absPosElement) &&
absPosElement != hostContent) {
if (mAbsolutelyPositionedObject) {
nsresult rv = RefreshGrabberInternal();
if (NS_FAILED(rv)) {
NS_WARNING("HTMLEditor::RefreshGrabberInternal() failed");
return rv;
}
} else {
nsresult rv = ShowGrabberInternal(*absPosElement);
if (NS_FAILED(rv)) {
NS_WARNING("HTMLEditor::ShowGrabberInternal() failed");
return rv;
}
}
}
// XXX Shouldn't we check whether the `<table>` element is editable or not?
if (IsInlineTableEditorEnabled() && cellElement &&
HTMLEditUtils::IsSimplyEditableNode(*cellElement) &&
cellElement != hostContent) {
if (mInlineEditedCell) {
nsresult rv = RefreshInlineTableEditingUIInternal();
if (NS_FAILED(rv)) {
NS_WARNING("HTMLEditor::RefreshInlineTableEditingUIInternal() failed");
return rv;
}
} else {
nsresult rv = ShowInlineTableEditingUIInternal(*cellElement);
if (NS_FAILED(rv)) {
NS_WARNING("HTMLEditor::ShowInlineTableEditingUIInternal() failed");
return rv;
}
}
}
return NS_OK;
}
// Resizing and Absolute Positioning need to know everything about the
// containing box of the element: position, size, margins, borders
nsresult HTMLEditor::GetPositionAndDimensions(Element& aElement, int32_t& aX,
int32_t& aY, int32_t& aW,
int32_t& aH, int32_t& aBorderLeft,
int32_t& aBorderTop,
int32_t& aMarginLeft,
int32_t& aMarginTop) {
// Is the element positioned ? let's check the cheap way first...
bool isPositioned =
aElement.HasAttr(kNameSpaceID_None, nsGkAtoms::_moz_abspos);
if (!isPositioned) {
// hmmm... the expensive way now...
nsAutoString positionValue;
DebugOnly<nsresult> rvIgnored = CSSEditUtils::GetComputedProperty(
aElement, *nsGkAtoms::position, positionValue);
if (NS_WARN_IF(Destroyed())) {
return NS_ERROR_EDITOR_DESTROYED;
}
NS_WARNING_ASSERTION(NS_SUCCEEDED(rvIgnored),
"CSSEditUtils::GetComputedProperty(nsGkAtoms::"
"position) failed, but ignored");
isPositioned = positionValue.EqualsLiteral("absolute");
}
if (isPositioned) {
// Yes, it is absolutely positioned
mResizedObjectIsAbsolutelyPositioned = true;
// Get the all the computed css styles attached to the element node
RefPtr<nsComputedDOMStyle> computedDOMStyle =
CSSEditUtils::GetComputedStyle(&aElement);
if (NS_WARN_IF(!computedDOMStyle)) {
return NS_ERROR_FAILURE;
}
aBorderLeft = GetCSSFloatValue(computedDOMStyle, "border-left-width"_ns);
aBorderTop = GetCSSFloatValue(computedDOMStyle, "border-top-width"_ns);
aMarginLeft = GetCSSFloatValue(computedDOMStyle, "margin-left"_ns);
aMarginTop = GetCSSFloatValue(computedDOMStyle, "margin-top"_ns);
aX = GetCSSFloatValue(computedDOMStyle, "left"_ns) + aMarginLeft +
aBorderLeft;
aY = GetCSSFloatValue(computedDOMStyle, "top"_ns) + aMarginTop + aBorderTop;
aW = GetCSSFloatValue(computedDOMStyle, "width"_ns);
aH = GetCSSFloatValue(computedDOMStyle, "height"_ns);
} else {
mResizedObjectIsAbsolutelyPositioned = false;
RefPtr<nsGenericHTMLElement> htmlElement =
nsGenericHTMLElement::FromNode(aElement);
if (!htmlElement) {
return NS_ERROR_NULL_POINTER;
}
DebugOnly<nsresult> rvIgnored = GetElementOrigin(aElement, aX, aY);
NS_WARNING_ASSERTION(NS_SUCCEEDED(rvIgnored),
"HTMLEditor::GetElementOrigin() failed, but ignored");
aW = htmlElement->OffsetWidth();
aH = htmlElement->OffsetHeight();
aBorderLeft = 0;
aBorderTop = 0;
aMarginLeft = 0;
aMarginTop = 0;
}
return NS_OK;
}
nsresult HTMLEditor::SetAnonymousElementPositionWithoutTransaction(
nsStyledElement& aStyledElement, int32_t aX, int32_t aY) {
nsresult rv;
rv = mCSSEditUtils->SetCSSPropertyPixelsWithoutTransaction(
aStyledElement, *nsGkAtoms::left, aX);
if (rv == NS_ERROR_EDITOR_DESTROYED) {
NS_WARNING(
"CSSEditUtils::SetCSSPropertyPixelsWithoutTransaction(nsGkAtoms::left) "
"destroyed the editor");
return NS_ERROR_EDITOR_DESTROYED;
}
NS_WARNING_ASSERTION(
NS_SUCCEEDED(rv),
"CSSEditUtils::SetCSSPropertyPixelsWithoutTransaction(nsGkAtoms::left) "
"failed, but ignored");
rv = mCSSEditUtils->SetCSSPropertyPixelsWithoutTransaction(
aStyledElement, *nsGkAtoms::top, aY);
if (rv == NS_ERROR_EDITOR_DESTROYED) {
NS_WARNING(
"CSSEditUtils::SetCSSPropertyPixelsWithoutTransaction(nsGkAtoms::top) "
"destroyed the editor");
return NS_ERROR_EDITOR_DESTROYED;
}
NS_WARNING_ASSERTION(
NS_SUCCEEDED(rv),
"CSSEditUtils::SetCSSPropertyPixelsWithoutTransaction(nsGkAtoms::top) "
"failed, but ignored");
return NS_OK;
}
} // namespace mozilla