The Tor Browser: editor/libeditor/html/nsHTMLAnonymousUtils.cpp@7e26c7da4463 (annotated)

editor/libeditor/html/nsHTMLAnonymousUtils.cpp@7e26c7da4463 (annotated)

editor/libeditor/html/nsHTMLAnonymousUtils.cpp

Wed, 31 Dec 2014 06:55:50 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:55:50 +0100
changeset 2: 7e26c7da4463
permissions: -rw-r--r--

Added tag UPSTREAM_283F7C6 for changeset ca08bd8f51b2

 /* 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 "nsEditProperty.h"
 #include "nsError.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;
 // 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 MOZ_FINAL : public nsIMutationObserver
 {
 public:
   nsElementDeletionObserver(nsINode* aNativeAnonNode, nsINode* aObservedNode)
   : mNativeAnonNode(aNativeAnonNode), mObservedNode(aObservedNode) {}
   NS_DECL_ISUPPORTS
   NS_DECL_NSIMUTATIONOBSERVER
 protected:
   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<dom::Element> newContent;
   nsresult res = CreateHTMLContent(aTag, getter_AddRefs(newContent));
   NS_ENSURE_SUCCESS(res, res);
   nsCOMPtr<nsIDOMElement> newElement = do_QueryInterface(newContent);
   NS_ENSURE_TRUE(newElement, NS_ERROR_FAILURE);
   // add the "hidden" class if needed
   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,
                                          nsIDOMElement* 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
 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 (nsEditProperty::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 = nsEditProperty::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 (nsEditProperty::img != focusTagAtom &&
       nsEditProperty::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 != mAbsolutelyPositionedObject) {
     res = HideGrabber();
     NS_ENSURE_SUCCESS(res, res);
     NS_ASSERTION(!mAbsolutelyPositionedObject, "HideGrabber failed");
   }
   if (mIsObjectResizingEnabled && mResizedObject &&
       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 (nsEditProperty::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)
 {
   NS_ENSURE_ARG_POINTER(aElement);
   // 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(aElement, nsEditProperty::cssPosition,
                                        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(aElement);
     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);
 }

The Tor Browser / annotate

editor/libeditor/html/nsHTMLAnonymousUtils.cpp@7e26c7da4463 (annotated)

editor/libeditor/html/nsHTMLAnonymousUtils.cpp