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gecko-dev
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gecko-dev/editor/libeditor/HTMLAnonymousNodeEditor.cpp

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18 KiB
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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 "mozilla/HTMLEditor.h"
#include "mozilla/Attributes.h"
#include "mozilla/dom/Element.h"
#include "mozilla/mozalloc.h"
#include "nsAString.h"
#include "nsCOMPtr.h"
#include "nsComputedDOMStyle.h"
#include "nsDebug.h"
#include "nsError.h"
#include "nsGkAtoms.h"
#include "nsIAtom.h"
#include "nsIContent.h"
#include "nsID.h"
#include "nsIDOMCSSPrimitiveValue.h"
#include "nsIDOMCSSStyleDeclaration.h"
#include "nsIDOMCSSValue.h"
#include "nsIDOMElement.h"
#include "nsIDOMEventTarget.h"
#include "nsIDOMHTMLElement.h"
#include "nsIDOMNode.h"
#include "nsIDOMWindow.h"
#include "nsIDocument.h"
#include "nsIDocumentObserver.h"
#include "nsIHTMLAbsPosEditor.h"
#include "nsIHTMLInlineTableEditor.h"
#include "nsIHTMLObjectResizer.h"
#include "nsStubMutationObserver.h"
#include "nsINode.h"
#include "nsIPresShell.h"
#include "nsISupportsImpl.h"
#include "nsISupportsUtils.h"
#include "nsLiteralString.h"
#include "nsPresContext.h"
#include "nsReadableUtils.h"
#include "nsString.h"
#include "nsStringFwd.h"
#include "nsUnicharUtils.h"
#include "nscore.h"
#include "nsContentUtils.h" // for nsAutoScriptBlocker
class nsIDOMEventListener;
class nsISelection;
namespace mozilla {
using namespace dom;
// retrieve an integer stored into a CSS computed float value
static int32_t GetCSSFloatValue(nsIDOMCSSStyleDeclaration * aDecl,
const nsAString & aProperty)
{
MOZ_ASSERT(aDecl);
nsCOMPtr<nsIDOMCSSValue> value;
// get the computed CSSValue of the property
nsresult rv = aDecl->GetPropertyCSSValue(aProperty, getter_AddRefs(value));
if (NS_FAILED(rv) || !value) {
return 0;
}
// check the type of the returned CSSValue; we handle here only
// pixel and enum types
nsCOMPtr<nsIDOMCSSPrimitiveValue> val = do_QueryInterface(value);
uint16_t type;
val->GetPrimitiveType(&type);
float f = 0;
switch (type) {
case nsIDOMCSSPrimitiveValue::CSS_PX:
// the value is in pixels, just get it
rv = val->GetFloatValue(nsIDOMCSSPrimitiveValue::CSS_PX, &f);
NS_ENSURE_SUCCESS(rv, 0);
break;
case nsIDOMCSSPrimitiveValue::CSS_IDENT: {
// the value is keyword, we have to map these keywords into
// numeric values
nsAutoString str;
val->GetStringValue(str);
if (str.EqualsLiteral("thin")) {
f = 1;
} else if (str.EqualsLiteral("medium")) {
f = 3;
} else if (str.EqualsLiteral("thick")) {
f = 5;
}
break;
}
}
return (int32_t) f;
}
class ElementDeletionObserver final : public nsStubMutationObserver
{
public:
ElementDeletionObserver(nsIContent* aNativeAnonNode,
nsIContent* aObservedNode)
: mNativeAnonNode(aNativeAnonNode)
, mObservedNode(aObservedNode)
{}
NS_DECL_ISUPPORTS
NS_DECL_NSIMUTATIONOBSERVER_PARENTCHAINCHANGED
NS_DECL_NSIMUTATIONOBSERVER_NODEWILLBEDESTROYED
protected:
~ElementDeletionObserver() {}
nsIContent* mNativeAnonNode;
nsIContent* mObservedNode;
};
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 == mObservedNode && mNativeAnonNode &&
mNativeAnonNode->GetParentNode() == aContent) {
// If the observed node has been moved to another document, there isn't much
// we can do easily. But at least be safe and unbind the native anonymous
// content and stop observing changes.
if (mNativeAnonNode->OwnerDoc() != mObservedNode->OwnerDoc()) {
mObservedNode->RemoveMutationObserver(this);
mObservedNode = nullptr;
mNativeAnonNode->RemoveMutationObserver(this);
mNativeAnonNode->UnbindFromTree();
mNativeAnonNode = nullptr;
NS_RELEASE_THIS();
return;
}
// We're staying in the same document, just rebind the native anonymous
// node so that the subtree root points to the right object etc.
mNativeAnonNode->UnbindFromTree();
mNativeAnonNode->BindToTree(mObservedNode->GetUncomposedDoc(), mObservedNode,
mObservedNode, true);
}
}
void
ElementDeletionObserver::NodeWillBeDestroyed(const nsINode* aNode)
{
NS_ASSERTION(aNode == mNativeAnonNode || aNode == mObservedNode,
"Wrong aNode!");
if (aNode == mNativeAnonNode) {
mObservedNode->RemoveMutationObserver(this);
mObservedNode = nullptr;
} else {
mNativeAnonNode->RemoveMutationObserver(this);
mNativeAnonNode->UnbindFromTree();
mNativeAnonNode = nullptr;
}
NS_RELEASE_THIS();
}
already_AddRefed<Element>
HTMLEditor::CreateAnonymousElement(nsIAtom* aTag,
nsIDOMNode* aParentNode,
const nsAString& aAnonClass,
bool aIsCreatedHidden)
{
if (NS_WARN_IF(!aParentNode)) {
return nullptr;
}
nsCOMPtr<nsIContent> parentContent = do_QueryInterface(aParentNode);
if (NS_WARN_IF(!parentContent)) {
return nullptr;
}
nsCOMPtr<nsIDocument> doc = GetDocument();
if (NS_WARN_IF(!doc)) {
return nullptr;
}
// Get the pres shell
nsCOMPtr<nsIPresShell> ps = GetPresShell();
if (NS_WARN_IF(!ps)) {
return nullptr;
}
// Create a new node through the element factory
RefPtr<Element> newContent = CreateHTMLContent(aTag);
if (NS_WARN_IF(!newContent)) {
return nullptr;
}
// add the "hidden" class if needed
if (aIsCreatedHidden) {
nsresult rv =
newContent->SetAttr(kNameSpaceID_None, nsGkAtoms::_class,
NS_LITERAL_STRING("hidden"), true);
if (NS_WARN_IF(NS_FAILED(rv))) {
return nullptr;
}
}
// add an _moz_anonclass attribute if needed
if (!aAnonClass.IsEmpty()) {
nsresult rv =
newContent->SetAttr(kNameSpaceID_None, nsGkAtoms::_moz_anonclass,
aAnonClass, true);
if (NS_WARN_IF(NS_FAILED(rv))) {
return nullptr;
}
}
{
nsAutoScriptBlocker scriptBlocker;
// establish parenthood of the element
newContent->SetIsNativeAnonymousRoot();
nsresult rv =
newContent->BindToTree(doc, parentContent, parentContent, true);
if (NS_FAILED(rv)) {
newContent->UnbindFromTree();
return nullptr;
}
}
ElementDeletionObserver* observer =
new ElementDeletionObserver(newContent, parentContent);
NS_ADDREF(observer); // NodeWillBeDestroyed releases.
parentContent->AddMutationObserver(observer);
newContent->AddMutationObserver(observer);
#ifdef DEBUG
// Editor anonymous content gets passed to RecreateFramesFor... 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.
newContent->SetProperty(nsGkAtoms::restylableAnonymousNode,
reinterpret_cast<void*>(true));
#endif // DEBUG
// display the element
ps->RecreateFramesFor(newContent);
return newContent.forget();
}
// Removes event listener and calls DeleteRefToAnonymousNode.
void
HTMLEditor::RemoveListenerAndDeleteRef(const nsAString& aEvent,
nsIDOMEventListener* aListener,
bool aUseCapture,
Element* aElement,
nsIContent* aParentContent,
nsIPresShell* aShell)
{
nsCOMPtr<nsIDOMEventTarget> evtTarget(do_QueryInterface(aElement));
if (evtTarget) {
evtTarget->RemoveEventListener(aEvent, aListener, aUseCapture);
}
DeleteRefToAnonymousNode(aElement, aParentContent, aShell);
}
// Deletes all references to an anonymous element
void
HTMLEditor::DeleteRefToAnonymousNode(nsIContent* aContent,
nsIContent* aParentContent,
nsIPresShell* aShell)
{
// 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;
}
nsAutoScriptBlocker scriptBlocker;
// Need to check whether aShell has been destroyed (but not yet deleted).
// In that case presContext->GetPresShell() returns nullptr.
// See bug 338129.
if (aContent->IsInComposedDoc() && aShell && aShell->GetPresContext() &&
aShell->GetPresContext()->GetPresShell() == aShell) {
nsCOMPtr<nsIDocumentObserver> docObserver = do_QueryInterface(aShell);
if (docObserver) {
// Call BeginUpdate() so that the nsCSSFrameConstructor/PresShell
// knows we're messing with the frame tree.
nsCOMPtr<nsIDocument> document = GetDocument();
if (document) {
docObserver->BeginUpdate(document, UPDATE_CONTENT_MODEL);
}
// XXX This is wrong (bug 439258). Once it's fixed, the NS_WARNING
// in RestyleManager::RestyleForRemove should be changed back
// to an assertion.
docObserver->ContentRemoved(aContent->GetComposedDoc(),
aParentContent, aContent, -1,
aContent->GetPreviousSibling());
if (document) {
docObserver->EndUpdate(document, UPDATE_CONTENT_MODEL);
}
}
}
aContent->UnbindFromTree();
}
// The following method is mostly called by a selection listener. When a
// selection change is notified, the method is called to check if resizing
// handles, a grabber and/or inline table editing UI need to be displayed
// or refreshed
NS_IMETHODIMP
HTMLEditor::CheckSelectionStateForAnonymousButtons(nsISelection* aSelection)
{
NS_ENSURE_ARG_POINTER(aSelection);
// early way out if all contextual UI extensions are disabled
NS_ENSURE_TRUE(mIsObjectResizingEnabled ||
mIsAbsolutelyPositioningEnabled ||
mIsInlineTableEditingEnabled, NS_OK);
// Don't change selection state if we're moving.
if (mIsMoving) {
return NS_OK;
}
nsCOMPtr<nsIDOMElement> focusElement;
// let's get the containing element of the selection
nsresult rv = GetSelectionContainer(getter_AddRefs(focusElement));
NS_ENSURE_TRUE(focusElement, NS_OK);
NS_ENSURE_SUCCESS(rv, rv);
// If we're not in a document, don't try to add resizers
nsCOMPtr<dom::Element> focusElementNode = do_QueryInterface(focusElement);
NS_ENSURE_STATE(focusElementNode);
if (!focusElementNode->IsInUncomposedDoc()) {
return NS_OK;
}
// what's its tag?
nsAutoString focusTagName;
rv = focusElement->GetTagName(focusTagName);
NS_ENSURE_SUCCESS(rv, rv);
ToLowerCase(focusTagName);
nsCOMPtr<nsIAtom> focusTagAtom = NS_Atomize(focusTagName);
nsCOMPtr<nsIDOMElement> absPosElement;
if (mIsAbsolutelyPositioningEnabled) {
// Absolute Positioning support is enabled, is the selection contained
// in an absolutely positioned element ?
rv =
GetAbsolutelyPositionedSelectionContainer(getter_AddRefs(absPosElement));
NS_ENSURE_SUCCESS(rv, rv);
}
nsCOMPtr<nsIDOMElement> cellElement;
if (mIsObjectResizingEnabled || mIsInlineTableEditingEnabled) {
// Resizing or Inline Table Editing is enabled, we need to check if the
// selection is contained in a table cell
rv = GetElementOrParentByTagName(NS_LITERAL_STRING("td"),
nullptr,
getter_AddRefs(cellElement));
NS_ENSURE_SUCCESS(rv, rv);
}
if (mIsObjectResizingEnabled && 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
nsCOMPtr<nsIDOMNode> tableNode = GetEnclosingTable(cellElement);
focusElement = do_QueryInterface(tableNode);
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 (mIsAbsolutelyPositioningEnabled && mAbsolutelyPositionedObject &&
absPosElement != GetAsDOMNode(mAbsolutelyPositionedObject)) {
rv = HideGrabber();
NS_ENSURE_SUCCESS(rv, rv);
NS_ASSERTION(!mAbsolutelyPositionedObject, "HideGrabber failed");
}
if (mIsObjectResizingEnabled && mResizedObject &&
GetAsDOMNode(mResizedObject) != focusElement) {
rv = HideResizers();
NS_ENSURE_SUCCESS(rv, rv);
NS_ASSERTION(!mResizedObject, "HideResizers failed");
}
if (mIsInlineTableEditingEnabled && mInlineEditedCell &&
mInlineEditedCell != cellElement) {
rv = HideInlineTableEditingUI();
NS_ENSURE_SUCCESS(rv, rv);
NS_ASSERTION(!mInlineEditedCell, "HideInlineTableEditingUI failed");
}
// now, let's display all contextual UI for good
nsIContent* hostContent = GetActiveEditingHost();
nsCOMPtr<nsIDOMNode> hostNode = do_QueryInterface(hostContent);
if (mIsObjectResizingEnabled && focusElement &&
IsModifiableNode(focusElement) && focusElement != hostNode) {
if (nsGkAtoms::img == focusTagAtom) {
mResizedObjectIsAnImage = true;
}
if (mResizedObject) {
nsresult rv = RefreshResizers();
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
} else {
nsresult rv = ShowResizers(focusElement);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
}
}
if (mIsAbsolutelyPositioningEnabled && absPosElement &&
IsModifiableNode(absPosElement) && absPosElement != hostNode) {
if (mAbsolutelyPositionedObject) {
nsresult rv = RefreshGrabber();
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
} else {
nsresult rv = ShowGrabberOnElement(absPosElement);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
}
}
if (mIsInlineTableEditingEnabled && cellElement &&
IsModifiableNode(cellElement) && cellElement != hostNode) {
if (mInlineEditedCell) {
nsresult rv = RefreshInlineTableEditingUI();
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
} else {
nsresult rv = ShowInlineTableEditingUI(cellElement);
if (NS_WARN_IF(NS_FAILED(rv))) {
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(nsIDOMElement* 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)
{
nsCOMPtr<Element> element = do_QueryInterface(aElement);
NS_ENSURE_ARG_POINTER(element);
// Is the element positioned ? let's check the cheap way first...
bool isPositioned = false;
nsresult rv =
aElement->HasAttribute(NS_LITERAL_STRING("_moz_abspos"), &isPositioned);
NS_ENSURE_SUCCESS(rv, rv);
if (!isPositioned) {
// hmmm... the expensive way now...
nsAutoString positionStr;
mCSSEditUtils->GetComputedProperty(*element, *nsGkAtoms::position,
positionStr);
isPositioned = positionStr.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> cssDecl =
mCSSEditUtils->GetComputedStyle(element);
NS_ENSURE_STATE(cssDecl);
aBorderLeft = GetCSSFloatValue(cssDecl, NS_LITERAL_STRING("border-left-width"));
aBorderTop = GetCSSFloatValue(cssDecl, NS_LITERAL_STRING("border-top-width"));
aMarginLeft = GetCSSFloatValue(cssDecl, NS_LITERAL_STRING("margin-left"));
aMarginTop = GetCSSFloatValue(cssDecl, NS_LITERAL_STRING("margin-top"));
aX = GetCSSFloatValue(cssDecl, NS_LITERAL_STRING("left")) +
aMarginLeft + aBorderLeft;
aY = GetCSSFloatValue(cssDecl, NS_LITERAL_STRING("top")) +
aMarginTop + aBorderTop;
aW = GetCSSFloatValue(cssDecl, NS_LITERAL_STRING("width"));
aH = GetCSSFloatValue(cssDecl, NS_LITERAL_STRING("height"));
} else {
mResizedObjectIsAbsolutelyPositioned = false;
nsCOMPtr<nsIDOMHTMLElement> htmlElement = do_QueryInterface(aElement);
if (!htmlElement) {
return NS_ERROR_NULL_POINTER;
}
GetElementOrigin(aElement, aX, aY);
if (NS_WARN_IF(NS_FAILED(htmlElement->GetOffsetWidth(&aW))) ||
NS_WARN_IF(NS_FAILED(htmlElement->GetOffsetHeight(&aH)))) {
return rv;
}
aBorderLeft = 0;
aBorderTop = 0;
aMarginLeft = 0;
aMarginTop = 0;
}
return NS_OK;
}
// self-explanatory
void
HTMLEditor::SetAnonymousElementPosition(int32_t aX,
int32_t aY,
Element* aElement)
{
mCSSEditUtils->SetCSSPropertyPixels(*aElement, *nsGkAtoms::left, aX);
mCSSEditUtils->SetCSSPropertyPixels(*aElement, *nsGkAtoms::top, aY);
}
} // namespace mozilla
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