481 lines
17 KiB
C++
481 lines
17 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/Attributes.h"
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#include "mozilla/dom/Element.h"
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#include "mozilla/mozalloc.h"
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#include "nsAString.h"
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#include "nsAutoPtr.h"
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#include "nsCOMPtr.h"
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#include "nsComputedDOMStyle.h"
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#include "nsDebug.h"
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#include "nsError.h"
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#include "nsGkAtoms.h"
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#include "nsHTMLCSSUtils.h"
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#include "nsHTMLEditor.h"
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#include "nsIAtom.h"
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#include "nsIContent.h"
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#include "nsID.h"
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#include "nsIDOMCSSPrimitiveValue.h"
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#include "nsIDOMCSSStyleDeclaration.h"
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#include "nsIDOMCSSValue.h"
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#include "nsIDOMElement.h"
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#include "nsIDOMEventTarget.h"
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#include "nsIDOMHTMLElement.h"
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#include "nsIDOMNode.h"
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#include "nsIDOMWindow.h"
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#include "nsIDocument.h"
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#include "nsIDocumentObserver.h"
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#include "nsIHTMLAbsPosEditor.h"
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#include "nsIHTMLEditor.h"
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#include "nsIHTMLInlineTableEditor.h"
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#include "nsIHTMLObjectResizer.h"
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#include "nsIMutationObserver.h"
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#include "nsINode.h"
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#include "nsIPresShell.h"
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#include "nsISupportsImpl.h"
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#include "nsISupportsUtils.h"
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#include "nsLiteralString.h"
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#include "nsPresContext.h"
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#include "nsReadableUtils.h"
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#include "nsString.h"
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#include "nsStringFwd.h"
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#include "nsUnicharUtils.h"
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#include "nscore.h"
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#include "nsContentUtils.h" // for nsAutoScriptBlocker
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class nsIDOMEventListener;
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class nsISelection;
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using namespace mozilla;
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using namespace mozilla::dom;
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// retrieve an integer stored into a CSS computed float value
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static int32_t GetCSSFloatValue(nsIDOMCSSStyleDeclaration * aDecl,
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const nsAString & aProperty)
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{
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MOZ_ASSERT(aDecl);
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nsCOMPtr<nsIDOMCSSValue> value;
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// get the computed CSSValue of the property
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nsresult res = aDecl->GetPropertyCSSValue(aProperty, getter_AddRefs(value));
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if (NS_FAILED(res) || !value) return 0;
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// check the type of the returned CSSValue; we handle here only
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// pixel and enum types
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nsCOMPtr<nsIDOMCSSPrimitiveValue> val = do_QueryInterface(value);
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uint16_t type;
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val->GetPrimitiveType(&type);
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float f = 0;
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switch (type) {
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case nsIDOMCSSPrimitiveValue::CSS_PX:
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// the value is in pixels, just get it
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res = val->GetFloatValue(nsIDOMCSSPrimitiveValue::CSS_PX, &f);
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NS_ENSURE_SUCCESS(res, 0);
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break;
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case nsIDOMCSSPrimitiveValue::CSS_IDENT: {
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// the value is keyword, we have to map these keywords into
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// numeric values
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nsAutoString str;
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res = val->GetStringValue(str);
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if (str.EqualsLiteral("thin"))
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f = 1;
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else if (str.EqualsLiteral("medium"))
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f = 3;
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else if (str.EqualsLiteral("thick"))
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f = 5;
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break;
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}
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}
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return (int32_t) f;
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}
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class nsElementDeletionObserver final : public nsIMutationObserver
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{
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public:
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nsElementDeletionObserver(nsINode* aNativeAnonNode, nsINode* aObservedNode)
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: mNativeAnonNode(aNativeAnonNode), mObservedNode(aObservedNode) {}
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NS_DECL_ISUPPORTS
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NS_DECL_NSIMUTATIONOBSERVER
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protected:
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~nsElementDeletionObserver() {}
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nsINode* mNativeAnonNode;
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nsINode* mObservedNode;
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};
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NS_IMPL_ISUPPORTS(nsElementDeletionObserver, nsIMutationObserver)
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NS_IMPL_NSIMUTATIONOBSERVER_CONTENT(nsElementDeletionObserver)
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void
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nsElementDeletionObserver::NodeWillBeDestroyed(const nsINode* aNode)
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{
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NS_ASSERTION(aNode == mNativeAnonNode || aNode == mObservedNode,
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"Wrong aNode!");
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if (aNode == mNativeAnonNode) {
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mObservedNode->RemoveMutationObserver(this);
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} else {
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mNativeAnonNode->RemoveMutationObserver(this);
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static_cast<nsIContent*>(mNativeAnonNode)->UnbindFromTree();
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}
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NS_RELEASE_THIS();
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}
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// Returns in *aReturn an anonymous nsDOMElement of type aTag,
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// child of aParentNode. If aIsCreatedHidden is true, the class
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// "hidden" is added to the created element. If aAnonClass is not
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// the empty string, it becomes the value of the attribute "_moz_anonclass"
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nsresult
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nsHTMLEditor::CreateAnonymousElement(const nsAString & aTag, nsIDOMNode * aParentNode,
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const nsAString & aAnonClass, bool aIsCreatedHidden,
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nsIDOMElement ** aReturn)
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{
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NS_ENSURE_ARG_POINTER(aParentNode);
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NS_ENSURE_ARG_POINTER(aReturn);
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*aReturn = nullptr;
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nsCOMPtr<nsIContent> parentContent( do_QueryInterface(aParentNode) );
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NS_ENSURE_TRUE(parentContent, NS_OK);
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nsCOMPtr<nsIDocument> doc = GetDocument();
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NS_ENSURE_TRUE(doc, NS_ERROR_NULL_POINTER);
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// Get the pres shell
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nsCOMPtr<nsIPresShell> ps = GetPresShell();
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NS_ENSURE_TRUE(ps, NS_ERROR_NOT_INITIALIZED);
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// Create a new node through the element factory
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nsCOMPtr<Element> newContent =
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CreateHTMLContent(nsCOMPtr<nsIAtom>(do_GetAtom(aTag)));
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NS_ENSURE_STATE(newContent);
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nsCOMPtr<nsIDOMElement> newElement = do_QueryInterface(newContent);
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NS_ENSURE_TRUE(newElement, NS_ERROR_FAILURE);
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// add the "hidden" class if needed
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nsresult res;
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if (aIsCreatedHidden) {
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res = newElement->SetAttribute(NS_LITERAL_STRING("class"),
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NS_LITERAL_STRING("hidden"));
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NS_ENSURE_SUCCESS(res, res);
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}
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// add an _moz_anonclass attribute if needed
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if (!aAnonClass.IsEmpty()) {
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res = newElement->SetAttribute(NS_LITERAL_STRING("_moz_anonclass"),
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aAnonClass);
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NS_ENSURE_SUCCESS(res, res);
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}
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{
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nsAutoScriptBlocker scriptBlocker;
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// establish parenthood of the element
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newContent->SetIsNativeAnonymousRoot();
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res = newContent->BindToTree(doc, parentContent, parentContent, true);
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if (NS_FAILED(res)) {
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newContent->UnbindFromTree();
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return res;
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}
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}
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nsElementDeletionObserver* observer =
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new nsElementDeletionObserver(newContent, parentContent);
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NS_ADDREF(observer); // NodeWillBeDestroyed releases.
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parentContent->AddMutationObserver(observer);
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newContent->AddMutationObserver(observer);
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#ifdef DEBUG
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// Editor anonymous content gets passed to RecreateFramesFor... which can't
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// _really_ deal with anonymous content (because it can't get the frame tree
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// ordering right). But for us the ordering doesn't matter so this is sort of
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// ok.
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newContent->SetProperty(nsGkAtoms::restylableAnonymousNode,
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reinterpret_cast<void*>(true));
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#endif // DEBUG
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// display the element
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ps->RecreateFramesFor(newContent);
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newElement.forget(aReturn);
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return NS_OK;
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}
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// Removes event listener and calls DeleteRefToAnonymousNode.
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void
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nsHTMLEditor::RemoveListenerAndDeleteRef(const nsAString& aEvent,
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nsIDOMEventListener* aListener,
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bool aUseCapture,
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Element* aElement,
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nsIContent * aParentContent,
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nsIPresShell* aShell)
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{
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nsCOMPtr<nsIDOMEventTarget> evtTarget(do_QueryInterface(aElement));
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if (evtTarget) {
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evtTarget->RemoveEventListener(aEvent, aListener, aUseCapture);
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}
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DeleteRefToAnonymousNode(static_cast<nsIDOMElement*>(GetAsDOMNode(aElement)), aParentContent, aShell);
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}
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// Deletes all references to an anonymous element
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void
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nsHTMLEditor::DeleteRefToAnonymousNode(nsIDOMElement* aElement,
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nsIContent* aParentContent,
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nsIPresShell* aShell)
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{
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// call ContentRemoved() for the anonymous content
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// node so its references get removed from the frame manager's
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// undisplay map, and its layout frames get destroyed!
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if (aElement) {
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nsCOMPtr<nsIContent> content = do_QueryInterface(aElement);
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if (content) {
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nsAutoScriptBlocker scriptBlocker;
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// Need to check whether aShell has been destroyed (but not yet deleted).
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// In that case presContext->GetPresShell() returns nullptr.
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// See bug 338129.
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if (aShell && aShell->GetPresContext() &&
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aShell->GetPresContext()->GetPresShell() == aShell) {
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nsCOMPtr<nsIDocumentObserver> docObserver = do_QueryInterface(aShell);
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if (docObserver) {
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// Call BeginUpdate() so that the nsCSSFrameConstructor/PresShell
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// knows we're messing with the frame tree.
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nsCOMPtr<nsIDocument> document = GetDocument();
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if (document)
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docObserver->BeginUpdate(document, UPDATE_CONTENT_MODEL);
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// XXX This is wrong (bug 439258). Once it's fixed, the NS_WARNING
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// in RestyleManager::RestyleForRemove should be changed back
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// to an assertion.
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docObserver->ContentRemoved(content->GetCurrentDoc(),
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aParentContent, content, -1,
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content->GetPreviousSibling());
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if (document)
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docObserver->EndUpdate(document, UPDATE_CONTENT_MODEL);
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}
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}
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content->UnbindFromTree();
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}
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}
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}
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// The following method is mostly called by a selection listener. When a
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// selection change is notified, the method is called to check if resizing
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// handles, a grabber and/or inline table editing UI need to be displayed
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// or refreshed
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NS_IMETHODIMP
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nsHTMLEditor::CheckSelectionStateForAnonymousButtons(nsISelection * aSelection)
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{
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NS_ENSURE_ARG_POINTER(aSelection);
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// early way out if all contextual UI extensions are disabled
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NS_ENSURE_TRUE(mIsObjectResizingEnabled ||
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mIsAbsolutelyPositioningEnabled ||
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mIsInlineTableEditingEnabled, NS_OK);
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// Don't change selection state if we're moving.
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if (mIsMoving) {
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return NS_OK;
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}
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nsCOMPtr<nsIDOMElement> focusElement;
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// let's get the containing element of the selection
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nsresult res = GetSelectionContainer(getter_AddRefs(focusElement));
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NS_ENSURE_TRUE(focusElement, NS_OK);
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NS_ENSURE_SUCCESS(res, res);
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// If we're not in a document, don't try to add resizers
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nsCOMPtr<dom::Element> focusElementNode = do_QueryInterface(focusElement);
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NS_ENSURE_STATE(focusElementNode);
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if (!focusElementNode->IsInDoc()) {
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return NS_OK;
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}
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// what's its tag?
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nsAutoString focusTagName;
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res = focusElement->GetTagName(focusTagName);
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NS_ENSURE_SUCCESS(res, res);
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ToLowerCase(focusTagName);
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nsCOMPtr<nsIAtom> focusTagAtom = do_GetAtom(focusTagName);
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nsCOMPtr<nsIDOMElement> absPosElement;
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if (mIsAbsolutelyPositioningEnabled) {
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// Absolute Positioning support is enabled, is the selection contained
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// in an absolutely positioned element ?
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res = GetAbsolutelyPositionedSelectionContainer(getter_AddRefs(absPosElement));
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NS_ENSURE_SUCCESS(res, res);
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}
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nsCOMPtr<nsIDOMElement> cellElement;
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if (mIsObjectResizingEnabled || mIsInlineTableEditingEnabled) {
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// Resizing or Inline Table Editing is enabled, we need to check if the
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// selection is contained in a table cell
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res = GetElementOrParentByTagName(NS_LITERAL_STRING("td"),
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nullptr,
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getter_AddRefs(cellElement));
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NS_ENSURE_SUCCESS(res, res);
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}
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if (mIsObjectResizingEnabled && cellElement) {
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// we are here because Resizing is enabled AND selection is contained in
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// a cell
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// get the enclosing table
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if (nsGkAtoms::img != focusTagAtom) {
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// the element container of the selection is not an image, so we'll show
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// the resizers around the table
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nsCOMPtr<nsIDOMNode> tableNode = GetEnclosingTable(cellElement);
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focusElement = do_QueryInterface(tableNode);
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focusTagAtom = nsGkAtoms::table;
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}
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}
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// we allow resizers only around images, tables, and absolutely positioned
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// elements. If we don't have image/table, let's look at the latter case.
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if (nsGkAtoms::img != focusTagAtom && nsGkAtoms::table != focusTagAtom) {
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focusElement = absPosElement;
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}
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// at this point, focusElement contains the element for Resizing,
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// cellElement contains the element for InlineTableEditing
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// absPosElement contains the element for Positioning
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// Note: All the Hide/Show methods below may change attributes on real
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// content which means a DOMAttrModified handler may cause arbitrary
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// side effects while this code runs (bug 420439).
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if (mIsAbsolutelyPositioningEnabled && mAbsolutelyPositionedObject &&
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absPosElement != GetAsDOMNode(mAbsolutelyPositionedObject)) {
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res = HideGrabber();
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NS_ENSURE_SUCCESS(res, res);
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NS_ASSERTION(!mAbsolutelyPositionedObject, "HideGrabber failed");
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}
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if (mIsObjectResizingEnabled && mResizedObject &&
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GetAsDOMNode(mResizedObject) != focusElement) {
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res = HideResizers();
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NS_ENSURE_SUCCESS(res, res);
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NS_ASSERTION(!mResizedObject, "HideResizers failed");
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}
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if (mIsInlineTableEditingEnabled && mInlineEditedCell &&
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mInlineEditedCell != cellElement) {
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res = HideInlineTableEditingUI();
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NS_ENSURE_SUCCESS(res, res);
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NS_ASSERTION(!mInlineEditedCell, "HideInlineTableEditingUI failed");
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}
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// now, let's display all contextual UI for good
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nsIContent* hostContent = GetActiveEditingHost();
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nsCOMPtr<nsIDOMNode> hostNode = do_QueryInterface(hostContent);
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if (mIsObjectResizingEnabled && focusElement &&
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IsModifiableNode(focusElement) && focusElement != hostNode) {
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if (nsGkAtoms::img == focusTagAtom) {
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mResizedObjectIsAnImage = true;
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}
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if (mResizedObject)
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res = RefreshResizers();
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else
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res = ShowResizers(focusElement);
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NS_ENSURE_SUCCESS(res, res);
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}
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if (mIsAbsolutelyPositioningEnabled && absPosElement &&
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IsModifiableNode(absPosElement) && absPosElement != hostNode) {
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if (mAbsolutelyPositionedObject)
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res = RefreshGrabber();
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else
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res = ShowGrabberOnElement(absPosElement);
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NS_ENSURE_SUCCESS(res, res);
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}
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if (mIsInlineTableEditingEnabled && cellElement &&
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IsModifiableNode(cellElement) && cellElement != hostNode) {
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if (mInlineEditedCell)
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res = RefreshInlineTableEditingUI();
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else
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res = ShowInlineTableEditingUI(cellElement);
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}
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return res;
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}
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// Resizing and Absolute Positioning need to know everything about the
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// containing box of the element: position, size, margins, borders
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nsresult
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nsHTMLEditor::GetPositionAndDimensions(nsIDOMElement * aElement,
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int32_t & aX, int32_t & aY,
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int32_t & aW, int32_t & aH,
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int32_t & aBorderLeft,
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int32_t & aBorderTop,
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int32_t & aMarginLeft,
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int32_t & aMarginTop)
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{
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nsCOMPtr<Element> element = do_QueryInterface(aElement);
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NS_ENSURE_ARG_POINTER(element);
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// Is the element positioned ? let's check the cheap way first...
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bool isPositioned = false;
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nsresult res = aElement->HasAttribute(NS_LITERAL_STRING("_moz_abspos"), &isPositioned);
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NS_ENSURE_SUCCESS(res, res);
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if (!isPositioned) {
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// hmmm... the expensive way now...
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nsAutoString positionStr;
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mHTMLCSSUtils->GetComputedProperty(*element, *nsGkAtoms::position,
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positionStr);
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isPositioned = positionStr.EqualsLiteral("absolute");
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}
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if (isPositioned) {
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// Yes, it is absolutely positioned
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mResizedObjectIsAbsolutelyPositioned = true;
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// Get the all the computed css styles attached to the element node
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RefPtr<nsComputedDOMStyle> cssDecl =
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mHTMLCSSUtils->GetComputedStyle(element);
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NS_ENSURE_STATE(cssDecl);
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aBorderLeft = GetCSSFloatValue(cssDecl, NS_LITERAL_STRING("border-left-width"));
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aBorderTop = GetCSSFloatValue(cssDecl, NS_LITERAL_STRING("border-top-width"));
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aMarginLeft = GetCSSFloatValue(cssDecl, NS_LITERAL_STRING("margin-left"));
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aMarginTop = GetCSSFloatValue(cssDecl, NS_LITERAL_STRING("margin-top"));
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aX = GetCSSFloatValue(cssDecl, NS_LITERAL_STRING("left")) +
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aMarginLeft + aBorderLeft;
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aY = GetCSSFloatValue(cssDecl, NS_LITERAL_STRING("top")) +
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aMarginTop + aBorderTop;
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aW = GetCSSFloatValue(cssDecl, NS_LITERAL_STRING("width"));
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aH = GetCSSFloatValue(cssDecl, NS_LITERAL_STRING("height"));
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}
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else {
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mResizedObjectIsAbsolutelyPositioned = false;
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nsCOMPtr<nsIDOMHTMLElement> htmlElement = do_QueryInterface(aElement);
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if (!htmlElement) {
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return NS_ERROR_NULL_POINTER;
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}
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GetElementOrigin(aElement, aX, aY);
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res = htmlElement->GetOffsetWidth(&aW);
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NS_ENSURE_SUCCESS(res, res);
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res = htmlElement->GetOffsetHeight(&aH);
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aBorderLeft = 0;
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aBorderTop = 0;
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aMarginLeft = 0;
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aMarginTop = 0;
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}
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return res;
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}
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// self-explanatory
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void
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nsHTMLEditor::SetAnonymousElementPosition(int32_t aX, int32_t aY, nsIDOMElement *aElement)
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{
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mHTMLCSSUtils->SetCSSPropertyPixels(aElement, NS_LITERAL_STRING("left"), aX);
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mHTMLCSSUtils->SetCSSPropertyPixels(aElement, NS_LITERAL_STRING("top"), aY);
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|
}
|