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gecko/editor/libeditor/nsHTMLAnonymousUtils.cpp

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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/Attributes.h"
#include "mozilla/dom/Element.h"
#include "mozilla/mozalloc.h"
#include "nsAString.h"
#include "nsAutoPtr.h"
#include "nsCOMPtr.h"
#include "nsComputedDOMStyle.h"
#include "nsDebug.h"
#include "nsError.h"
#include "nsGkAtoms.h"
#include "nsHTMLCSSUtils.h"
#include "nsHTMLEditor.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 "nsIHTMLEditor.h"
#include "nsIHTMLInlineTableEditor.h"
#include "nsIHTMLObjectResizer.h"
#include "nsIMutationObserver.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;
using namespace mozilla;
using namespace mozilla::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 res = aDecl->GetPropertyCSSValue(aProperty, getter_AddRefs(value));
if (NS_FAILED(res) || !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
res = val->GetFloatValue(nsIDOMCSSPrimitiveValue::CSS_PX, &f);
NS_ENSURE_SUCCESS(res, 0);
break;
case nsIDOMCSSPrimitiveValue::CSS_IDENT: {
// the value is keyword, we have to map these keywords into
// numeric values
nsAutoString str;
res = 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 nsElementDeletionObserver final : public nsIMutationObserver
{
public:
nsElementDeletionObserver(nsINode* aNativeAnonNode, nsINode* aObservedNode)
: mNativeAnonNode(aNativeAnonNode), mObservedNode(aObservedNode) {}
NS_DECL_ISUPPORTS
NS_DECL_NSIMUTATIONOBSERVER
protected:
~nsElementDeletionObserver() {}
nsINode* mNativeAnonNode;
nsINode* mObservedNode;
};
NS_IMPL_ISUPPORTS(nsElementDeletionObserver, nsIMutationObserver)
NS_IMPL_NSIMUTATIONOBSERVER_CONTENT(nsElementDeletionObserver)
void
nsElementDeletionObserver::NodeWillBeDestroyed(const nsINode* aNode)
{
NS_ASSERTION(aNode == mNativeAnonNode || aNode == mObservedNode,
"Wrong aNode!");
if (aNode == mNativeAnonNode) {
mObservedNode->RemoveMutationObserver(this);
} else {
mNativeAnonNode->RemoveMutationObserver(this);
static_cast<nsIContent*>(mNativeAnonNode)->UnbindFromTree();
}
NS_RELEASE_THIS();
}
// Returns in *aReturn an anonymous nsDOMElement of type aTag,
// child of aParentNode. If aIsCreatedHidden is true, the class
// "hidden" is added to the created element. If aAnonClass is not
// the empty string, it becomes the value of the attribute "_moz_anonclass"
nsresult
nsHTMLEditor::CreateAnonymousElement(const nsAString & aTag, nsIDOMNode * aParentNode,
const nsAString & aAnonClass, bool aIsCreatedHidden,
nsIDOMElement ** aReturn)
{
NS_ENSURE_ARG_POINTER(aParentNode);
NS_ENSURE_ARG_POINTER(aReturn);
*aReturn = nullptr;
nsCOMPtr<nsIContent> parentContent( do_QueryInterface(aParentNode) );
NS_ENSURE_TRUE(parentContent, NS_OK);
nsCOMPtr<nsIDocument> doc = GetDocument();
NS_ENSURE_TRUE(doc, NS_ERROR_NULL_POINTER);
// Get the pres shell
nsCOMPtr<nsIPresShell> ps = GetPresShell();
NS_ENSURE_TRUE(ps, NS_ERROR_NOT_INITIALIZED);
// Create a new node through the element factory
nsCOMPtr<Element> newContent =
CreateHTMLContent(nsCOMPtr<nsIAtom>(do_GetAtom(aTag)));
NS_ENSURE_STATE(newContent);
nsCOMPtr<nsIDOMElement> newElement = do_QueryInterface(newContent);
NS_ENSURE_TRUE(newElement, NS_ERROR_FAILURE);
// add the "hidden" class if needed
nsresult res;
if (aIsCreatedHidden) {
res = newElement->SetAttribute(NS_LITERAL_STRING("class"),
NS_LITERAL_STRING("hidden"));
NS_ENSURE_SUCCESS(res, res);
}
// add an _moz_anonclass attribute if needed
if (!aAnonClass.IsEmpty()) {
res = newElement->SetAttribute(NS_LITERAL_STRING("_moz_anonclass"),
aAnonClass);
NS_ENSURE_SUCCESS(res, res);
}
{
nsAutoScriptBlocker scriptBlocker;
// establish parenthood of the element
newContent->SetIsNativeAnonymousRoot();
res = newContent->BindToTree(doc, parentContent, parentContent, true);
if (NS_FAILED(res)) {
newContent->UnbindFromTree();
return res;
}
}
nsElementDeletionObserver* observer =
new nsElementDeletionObserver(newContent, parentContent);
NS_ADDREF(observer); // NodeWillBeDestroyed releases.
parentContent->AddMutationObserver(observer);
newContent->AddMutationObserver(observer);
// display the element
ps->RecreateFramesFor(newContent);
newElement.forget(aReturn);
return NS_OK;
}
// Removes event listener and calls DeleteRefToAnonymousNode.
void
nsHTMLEditor::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(static_cast<nsIDOMElement*>(GetAsDOMNode(aElement)), aParentContent, aShell);
}
// Deletes all references to an anonymous element
void
nsHTMLEditor::DeleteRefToAnonymousNode(nsIDOMElement* aElement,
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 (aElement) {
nsCOMPtr<nsIContent> content = do_QueryInterface(aElement);
if (content) {
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 (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(content->GetCurrentDoc(),
aParentContent, content, -1,
content->GetPreviousSibling());
if (document)
docObserver->EndUpdate(document, UPDATE_CONTENT_MODEL);
}
}
content->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
nsHTMLEditor::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 res = GetSelectionContainer(getter_AddRefs(focusElement));
NS_ENSURE_TRUE(focusElement, NS_OK);
NS_ENSURE_SUCCESS(res, res);
// 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->IsInDoc()) {
return NS_OK;
}
// what's its tag?
nsAutoString focusTagName;
res = focusElement->GetTagName(focusTagName);
NS_ENSURE_SUCCESS(res, res);
ToLowerCase(focusTagName);
nsCOMPtr<nsIAtom> focusTagAtom = do_GetAtom(focusTagName);
nsCOMPtr<nsIDOMElement> absPosElement;
if (mIsAbsolutelyPositioningEnabled) {
// Absolute Positioning support is enabled, is the selection contained
// in an absolutely positioned element ?
res = GetAbsolutelyPositionedSelectionContainer(getter_AddRefs(absPosElement));
NS_ENSURE_SUCCESS(res, res);
}
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
res = GetElementOrParentByTagName(NS_LITERAL_STRING("td"),
nullptr,
getter_AddRefs(cellElement));
NS_ENSURE_SUCCESS(res, res);
}
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)) {
res = HideGrabber();
NS_ENSURE_SUCCESS(res, res);
NS_ASSERTION(!mAbsolutelyPositionedObject, "HideGrabber failed");
}
if (mIsObjectResizingEnabled && mResizedObject &&
GetAsDOMNode(mResizedObject) != focusElement) {
res = HideResizers();
NS_ENSURE_SUCCESS(res, res);
NS_ASSERTION(!mResizedObject, "HideResizers failed");
}
if (mIsInlineTableEditingEnabled && mInlineEditedCell &&
mInlineEditedCell != cellElement) {
res = HideInlineTableEditingUI();
NS_ENSURE_SUCCESS(res, res);
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)
res = RefreshResizers();
else
res = ShowResizers(focusElement);
NS_ENSURE_SUCCESS(res, res);
}
if (mIsAbsolutelyPositioningEnabled && absPosElement &&
IsModifiableNode(absPosElement) && absPosElement != hostNode) {
if (mAbsolutelyPositionedObject)
res = RefreshGrabber();
else
res = ShowGrabberOnElement(absPosElement);
NS_ENSURE_SUCCESS(res, res);
}
if (mIsInlineTableEditingEnabled && cellElement &&
IsModifiableNode(cellElement) && cellElement != hostNode) {
if (mInlineEditedCell)
res = RefreshInlineTableEditingUI();
else
res = ShowInlineTableEditingUI(cellElement);
}
return res;
}
// Resizing and Absolute Positioning need to know everything about the
// containing box of the element: position, size, margins, borders
nsresult
nsHTMLEditor::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 res = aElement->HasAttribute(NS_LITERAL_STRING("_moz_abspos"), &isPositioned);
NS_ENSURE_SUCCESS(res, res);
if (!isPositioned) {
// hmmm... the expensive way now...
nsAutoString positionStr;
mHTMLCSSUtils->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
nsRefPtr<nsComputedDOMStyle> cssDecl =
mHTMLCSSUtils->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);
res = htmlElement->GetOffsetWidth(&aW);
NS_ENSURE_SUCCESS(res, res);
res = htmlElement->GetOffsetHeight(&aH);
aBorderLeft = 0;
aBorderTop = 0;
aMarginLeft = 0;
aMarginTop = 0;
}
return res;
}
// self-explanatory
void
nsHTMLEditor::SetAnonymousElementPosition(int32_t aX, int32_t aY, nsIDOMElement *aElement)
{
mHTMLCSSUtils->SetCSSPropertyPixels(aElement, NS_LITERAL_STRING("left"), aX);
mHTMLCSSUtils->SetCSSPropertyPixels(aElement, NS_LITERAL_STRING("top"), aY);
}
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