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gecko/content/base/public/nsIContent.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Communicator client code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef nsIContent_h___
#define nsIContent_h___
#include "nsCOMPtr.h" // for already_AddRefed
#include "nsStringGlue.h"
#include "nsCaseTreatment.h"
#include "nsChangeHint.h"
#include "nsINode.h"
#include "nsIProgrammingLanguage.h" // for ::JAVASCRIPT
// Forward declarations
class nsIAtom;
class nsIDocument;
class nsPresContext;
class nsVoidArray;
class nsIDOMEvent;
class nsIContent;
class nsIEventListenerManager;
class nsIURI;
class nsICSSStyleRule;
class nsRuleWalker;
class nsAttrValue;
class nsAttrName;
class nsTextFragment;
class nsIDocShell;
// IID for the nsIContent interface
#define NS_ICONTENT_IID \
{ 0x2813b1d9, 0x7fe1, 0x496f, \
{ 0x85, 0x52, 0xa2, 0xc1, 0xc5, 0x6b, 0x15, 0x40 } }
/**
* A node of content in a document's content model. This interface
* is supported by all content objects.
*/
class nsIContent : public nsINode {
public:
#ifdef MOZILLA_INTERNAL_API
// If you're using the external API, the only thing you can know about
// nsIContent is that it exists with an IID
nsIContent(nsINodeInfo *aNodeInfo)
: nsINode(aNodeInfo)
{
NS_ASSERTION(aNodeInfo,
"No nsINodeInfo passed to nsIContent, PREPARE TO CRASH!!!");
}
#endif // MOZILLA_INTERNAL_API
NS_DECLARE_STATIC_IID_ACCESSOR(NS_ICONTENT_IID)
/**
* Bind this content node to a tree. If this method throws, the caller must
* call UnbindFromTree() on the node. In the typical case of a node being
* appended to a parent, this will be called after the node has been added to
* the parent's child list and before nsIDocumentObserver notifications for
* the addition are dispatched.
* @param aDocument The new document for the content node. Must match the
* current document of aParent, if aParent is not null.
* May not be null if aParent is null.
* @param aParent The new parent for the content node. May be null if the
* node is being bound as a direct child of the document.
* @param aBindingParent The new binding parent for the content node.
* This is allowed to be null. In that case, the
* binding parent of aParent, if any, will be used.
* @param aCompileEventHandlers whether to initialize the event handlers in
* the document (used by nsXULElement)
* @note either aDocument or aParent must be non-null. If both are null,
* this method _will_ crash.
* @note This method must not be called by consumers of nsIContent on a node
* that is already bound to a tree. Call UnbindFromTree first.
* @note This method will handle rebinding descendants appropriately (eg
* changing their binding parent as needed).
* @note This method does not add the content node to aParent's child list
* @throws NS_ERROR_OUT_OF_MEMORY if that happens
*/
virtual nsresult BindToTree(nsIDocument* aDocument, nsIContent* aParent,
nsIContent* aBindingParent,
PRBool aCompileEventHandlers) = 0;
/**
* Unbind this content node from a tree. This will set its current document
* and binding parent to null. In the typical case of a node being removed
* from a parent, this will be called after it has been removed from the
* parent's child list and after the nsIDocumentObserver notifications for
* the removal have been dispatched.
* @param aDeep Whether to recursively unbind the entire subtree rooted at
* this node. The only time PR_FALSE should be passed is when the
* parent node of the content is being destroyed.
* @param aNullParent Whether to null out the parent pointer as well. This
* is usually desirable. This argument should only be false while
* recursively calling UnbindFromTree when a subtree is detached.
* @note This method is safe to call on nodes that are not bound to a tree.
*/
virtual void UnbindFromTree(PRBool aDeep = PR_TRUE,
PRBool aNullParent = PR_TRUE) = 0;
/**
* DEPRECATED - Use GetCurrentDoc or GetOwnerDoc.
* Get the document for this content.
* @return the document
*/
nsIDocument *GetDocument() const
{
return GetCurrentDoc();
}
/**
* Get whether this content is C++-generated anonymous content
* @see nsIAnonymousContentCreator
* @return whether this content is anonymous
*/
PRBool IsRootOfNativeAnonymousSubtree() const
{
return HasFlag(NODE_IS_ANONYMOUS);
}
/**
* Makes this content anonymous
* @see nsIAnonymousContentCreator
*/
void SetNativeAnonymous()
{
SetFlags(NODE_IS_ANONYMOUS);
}
/**
* Returns |this| if it is not native anonymous, otherwise
* first non native anonymous ancestor.
*/
virtual nsIContent* FindFirstNonNativeAnonymous() const;
/**
* Returns PR_TRUE if |this| or any of its ancestors is native anonymous.
*/
PRBool IsInNativeAnonymousSubtree() const
{
#ifdef DEBUG
if (HasFlag(NODE_IS_IN_ANONYMOUS_SUBTREE)) {
return PR_TRUE;
}
nsIContent* content = GetBindingParent();
while (content) {
if (content->IsRootOfNativeAnonymousSubtree()) {
NS_ERROR("Element not marked to be in native anonymous subtree!");
break;
}
content = content->GetBindingParent();
}
return PR_FALSE;
#else
return HasFlag(NODE_IS_IN_ANONYMOUS_SUBTREE);
#endif
}
/**
* Returns true if and only if this node has a parent, but is not in
* its parent's child list.
*/
PRBool IsRootOfAnonymousSubtree() const
{
NS_ASSERTION(!IsRootOfNativeAnonymousSubtree() ||
(GetParent() && GetBindingParent() == GetParent()),
"root of native anonymous subtree must have parent equal "
"to binding parent");
nsIContent *bindingParent = GetBindingParent();
return bindingParent && bindingParent == GetParent();
}
/**
* Returns true if and only if there is NOT a path through child lists
* from the top of this node's parent chain back to this node.
*/
PRBool IsInAnonymousSubtree() const
{
NS_ASSERTION(!IsInNativeAnonymousSubtree() || GetBindingParent(),
"must have binding parent when in native anonymous subtree");
return GetBindingParent() != nsnull;
}
/**
* Get the namespace that this element's tag is defined in
* @return the namespace
*/
PRInt32 GetNameSpaceID() const
{
return mNodeInfo->NamespaceID();
}
/**
* Get the tag for this element. This will always return a non-null
* atom pointer (as implied by the naming of the method).
*/
nsIAtom *Tag() const
{
return mNodeInfo->NameAtom();
}
/**
* Get the NodeInfo for this element
* @return the nodes node info
*/
nsINodeInfo *NodeInfo() const
{
return mNodeInfo;
}
/**
* Returns an atom holding the name of the attribute of type ID on
* this content node (if applicable). Returns null for non-element
* content nodes.
*/
virtual nsIAtom *GetIDAttributeName() const = 0;
/**
* Normalizes an attribute name and returns it as a nodeinfo if an attribute
* with that name exists. This method is intended for character case
* conversion if the content object is case insensitive (e.g. HTML). Returns
* the nodeinfo of the attribute with the specified name if one exists or
* null otherwise.
*
* @param aStr the unparsed attribute string
* @return the node info. May be nsnull.
*/
virtual already_AddRefed<nsINodeInfo> GetExistingAttrNameFromQName(const nsAString& aStr) const = 0;
/**
* Set attribute values. All attribute values are assumed to have a
* canonical string representation that can be used for these
* methods. The SetAttr method is assumed to perform a translation
* of the canonical form into the underlying content specific
* form.
*
* @param aNameSpaceID the namespace of the attribute
* @param aName the name of the attribute
* @param aValue the value to set
* @param aNotify specifies how whether or not the document should be
* notified of the attribute change.
*/
nsresult SetAttr(PRInt32 aNameSpaceID, nsIAtom* aName,
const nsAString& aValue, PRBool aNotify)
{
return SetAttr(aNameSpaceID, aName, nsnull, aValue, aNotify);
}
/**
* Set attribute values. All attribute values are assumed to have a
* canonical String representation that can be used for these
* methods. The SetAttr method is assumed to perform a translation
* of the canonical form into the underlying content specific
* form.
*
* @param aNameSpaceID the namespace of the attribute
* @param aName the name of the attribute
* @param aPrefix the prefix of the attribute
* @param aValue the value to set
* @param aNotify specifies how whether or not the document should be
* notified of the attribute change.
*/
virtual nsresult SetAttr(PRInt32 aNameSpaceID, nsIAtom* aName,
nsIAtom* aPrefix, const nsAString& aValue,
PRBool aNotify) = 0;
/**
* Get the current value of the attribute. This returns a form that is
* suitable for passing back into SetAttr.
*
* @param aNameSpaceID the namespace of the attr
* @param aName the name of the attr
* @param aResult the value (may legitimately be the empty string) [OUT]
* @returns PR_TRUE if the attribute was set (even when set to empty string)
* PR_FALSE when not set.
*/
virtual PRBool GetAttr(PRInt32 aNameSpaceID, nsIAtom* aName,
nsAString& aResult) const = 0;
/**
* Determine if an attribute has been set (empty string or otherwise).
*
* @param aNameSpaceId the namespace id of the attribute
* @param aAttr the attribute name
* @return whether an attribute exists
*/
virtual PRBool HasAttr(PRInt32 aNameSpaceID, nsIAtom* aName) const = 0;
/**
* Test whether this content node's given attribute has the given value. If
* the attribute is not set at all, this will return false.
*
* @param aNameSpaceID The namespace ID of the attribute. Must not
* be kNameSpaceID_Unknown.
* @param aName The name atom of the attribute. Must not be null.
* @param aValue The value to compare to.
* @param aCaseSensitive Whether to do a case-sensitive compare on the value.
*/
virtual PRBool AttrValueIs(PRInt32 aNameSpaceID,
nsIAtom* aName,
const nsAString& aValue,
nsCaseTreatment aCaseSensitive) const
{
return PR_FALSE;
}
/**
* Test whether this content node's given attribute has the given value. If
* the attribute is not set at all, this will return false.
*
* @param aNameSpaceID The namespace ID of the attribute. Must not
* be kNameSpaceID_Unknown.
* @param aName The name atom of the attribute. Must not be null.
* @param aValue The value to compare to. Must not be null.
* @param aCaseSensitive Whether to do a case-sensitive compare on the value.
*/
virtual PRBool AttrValueIs(PRInt32 aNameSpaceID,
nsIAtom* aName,
nsIAtom* aValue,
nsCaseTreatment aCaseSensitive) const
{
return PR_FALSE;
}
enum {
ATTR_MISSING = -1,
ATTR_VALUE_NO_MATCH = -2
};
/**
* Check whether this content node's given attribute has one of a given
* list of values. If there is a match, we return the index in the list
* of the first matching value. If there was no attribute at all, then
* we return ATTR_MISSING. If there was an attribute but it didn't
* match, we return ATTR_VALUE_NO_MATCH. A non-negative result always
* indicates a match.
*
* @param aNameSpaceID The namespace ID of the attribute. Must not
* be kNameSpaceID_Unknown.
* @param aName The name atom of the attribute. Must not be null.
* @param aValues a NULL-terminated array of pointers to atom values to test
* against.
* @param aCaseSensitive Whether to do a case-sensitive compare on the values.
* @return ATTR_MISSING, ATTR_VALUE_NO_MATCH or the non-negative index
* indicating the first value of aValues that matched
*/
typedef nsIAtom* const* const AttrValuesArray;
virtual PRInt32 FindAttrValueIn(PRInt32 aNameSpaceID,
nsIAtom* aName,
AttrValuesArray* aValues,
nsCaseTreatment aCaseSensitive) const
{
return ATTR_MISSING;
}
/**
* Remove an attribute so that it is no longer explicitly specified.
*
* @param aNameSpaceID the namespace id of the attribute
* @param aAttr the name of the attribute to unset
* @param aNotify specifies whether or not the document should be
* notified of the attribute change
*/
virtual nsresult UnsetAttr(PRInt32 aNameSpaceID, nsIAtom* aAttr,
PRBool aNotify) = 0;
/**
* Get the namespace / name / prefix of a given attribute.
*
* @param aIndex the index of the attribute name
* @returns The name at the given index, or null if the index is
* out-of-bounds.
* @note The document returned by NodeInfo()->GetDocument() (if one is
* present) is *not* neccesarily the owner document of the element.
* @note The pointer returned by this function is only valid until the
* next call of either GetAttrNameAt or SetAttr on the element.
*/
virtual const nsAttrName* GetAttrNameAt(PRUint32 aIndex) const = 0;
/**
* Get the number of all specified attributes.
*
* @return the number of attributes
*/
virtual PRUint32 GetAttrCount() const = 0;
/**
* Get direct access (but read only) to the text in the text content.
* NOTE: For elements this is *not* the concatenation of all text children,
* it is simply null;
*/
virtual const nsTextFragment *GetText() = 0;
/**
* Get the length of the text content.
* NOTE: This should not be called on elements.
*/
virtual PRUint32 TextLength() = 0;
/**
* Set the text to the given value. If aNotify is PR_TRUE then
* the document is notified of the content change.
* NOTE: For elements this always ASSERTS and returns NS_ERROR_FAILURE
*/
virtual nsresult SetText(const PRUnichar* aBuffer, PRUint32 aLength,
PRBool aNotify) = 0;
/**
* Append the given value to the current text. If aNotify is PR_TRUE then
* the document is notified of the content change.
* NOTE: For elements this always ASSERTS and returns NS_ERROR_FAILURE
*/
virtual nsresult AppendText(const PRUnichar* aBuffer, PRUint32 aLength,
PRBool aNotify) = 0;
/**
* Set the text to the given value. If aNotify is PR_TRUE then
* the document is notified of the content change.
* NOTE: For elements this always asserts and returns NS_ERROR_FAILURE
*/
nsresult SetText(const nsAString& aStr, PRBool aNotify)
{
return SetText(aStr.BeginReading(), aStr.Length(), aNotify);
}
/**
* Query method to see if the frame is nothing but whitespace
* NOTE: Always returns PR_FALSE for elements
*/
virtual PRBool TextIsOnlyWhitespace() = 0;
/**
* Append the text content to aResult.
* NOTE: This asserts and returns for elements
*/
virtual void AppendTextTo(nsAString& aResult) = 0;
/**
* Set the focus on this content. This is generally something for the event
* state manager to do, not ordinary people. Ordinary people should do
* something like nsGenericHTMLElement::SetElementFocus(). This method is
* the end result, the point where the content finds out it has been focused.
*
* All content elements are potentially focusable.
*
* @param aPresContext the pres context
* @see nsGenericHTMLElement::SetElementFocus()
*/
virtual void SetFocus(nsPresContext* aPresContext)
{
}
/**
* Remove the focus on this content. This is generally something for the
* event state manager to do, not ordinary people. Ordinary people should do
* something like nsGenericHTMLElement::SetElementFocus(). This method is
* the end result, the point where the content finds out it has been focused.
*
* All content elements are potentially focusable.
*
* @param aPresContext the pres context
* @see nsGenericHTMLElement::SetElementFocus()
*/
virtual void RemoveFocus(nsPresContext* aPresContext)
{
}
/**
* Check if this content is focusable and in the current tab order.
* Note: most callers should use nsIFrame::IsFocusable() instead as it
* checks visibility and other layout factors as well.
* Tabbable is indicated by a nonnegative tabindex & is a subset of focusable.
* For example, only the selected radio button in a group is in the
* tab order, unless the radio group has no selection in which case
* all of the visible, non-disabled radio buttons in the group are
* in the tab order. On the other hand, all of the visible, non-disabled
* radio buttons are always focusable via clicking or script.
* Also, depending on either the accessibility.tabfocus pref or
* a system setting (nowadays: Full keyboard access, mac only)
* some widgets may be focusable but removed from the tab order.
* @param [inout, optional] aTabIndex the computed tab index
* In: default tabindex for element (-1 nonfocusable, == 0 focusable)
* Out: computed tabindex
* @param [optional] aTabIndex the computed tab index
* < 0 if not tabbable
* == 0 if in normal tab order
* > 0 can be tabbed to in the order specified by this value
* @return whether the content is focusable via mouse, kbd or script.
*/
virtual PRBool IsFocusable(PRInt32 *aTabIndex = nsnull)
{
if (aTabIndex)
*aTabIndex = -1; // Default, not tabbable
return PR_FALSE;
}
/**
* The method focuses (or activates) element that accesskey is bound to. It is
* called when accesskey is activated.
*
* @param aKeyCausesActivation - if true then element should be activated
* @param aIsTrustedEvent - if true then event that is cause of accesskey
* execution is trusted.
*/
virtual void PerformAccesskey(PRBool aKeyCausesActivation,
PRBool aIsTrustedEvent)
{
}
/*
* Get desired IME state for the content.
*
* @return The desired IME status for the content.
* This is a combination of IME_STATUS_* flags,
* controlling what happens to IME when the content takes focus.
* If this is IME_STATUS_NONE, IME remains in its current state.
* IME_STATUS_ENABLE and IME_STATUS_DISABLE must not be set
* together; likewise IME_STATUS_OPEN and IME_STATUS_CLOSE must
* not be set together.
* If you return IME_STATUS_DISABLE, you should not set the
* OPEN or CLOSE flag; that way, when IME is next enabled,
* the previous OPEN/CLOSE state will be restored (unless the newly
* focused content specifies the OPEN/CLOSE state by setting the OPEN
* or CLOSE flag with the ENABLE flag).
* IME_STATUS_PASSWORD should be returned only from password editor,
* this value has a special meaning. It is used as alternative of
* IME_STATUS_DISABLED.
* IME_STATUS_PLUGIN should be returned only when plug-in has focus.
* When a plug-in is focused content, we should send native events
* directly. Because we don't process some native events, but they may
* be needed by the plug-in.
*/
enum {
IME_STATUS_NONE = 0x0000,
IME_STATUS_ENABLE = 0x0001,
IME_STATUS_DISABLE = 0x0002,
IME_STATUS_PASSWORD = 0x0004,
IME_STATUS_PLUGIN = 0x0008,
IME_STATUS_OPEN = 0x0010,
IME_STATUS_CLOSE = 0x0020
};
enum {
IME_STATUS_MASK_ENABLED = IME_STATUS_ENABLE | IME_STATUS_DISABLE |
IME_STATUS_PASSWORD | IME_STATUS_PLUGIN,
IME_STATUS_MASK_OPENED = IME_STATUS_OPEN | IME_STATUS_CLOSE
};
virtual PRUint32 GetDesiredIMEState()
{
if (!IsEditableInternal())
return IME_STATUS_DISABLE;
nsIContent *editableAncestor = nsnull;
for (nsIContent* parent = GetParent();
parent && parent->HasFlag(NODE_IS_EDITABLE);
parent = parent->GetParent())
editableAncestor = parent;
// This is in another editable content, use the result of it.
if (editableAncestor)
return editableAncestor->GetDesiredIMEState();
return IME_STATUS_ENABLE;
}
/**
* Gets content node with the binding (or native code, possibly on the
* frame) responsible for our construction (and existence). Used by
* anonymous content (both XBL-generated and native-anonymous).
*
* null for all explicit content (i.e., content reachable from the top
* of its GetParent() chain via child lists).
*
* @return the binding parent
*/
virtual nsIContent *GetBindingParent() const = 0;
/**
* Get the base URI for any relative URIs within this piece of
* content. Generally, this is the document's base URI, but certain
* content carries a local base for backward compatibility, and XML
* supports setting a per-node base URI.
*
* @return the base URI
*/
virtual already_AddRefed<nsIURI> GetBaseURI() const = 0;
/**
* API to check if this is a link that's traversed in response to user input
* (e.g. a click event). Specializations for HTML/SVG/generic XML allow for
* different types of link in different types of content.
*
* @param aURI Required out param. If this content is a link, a new nsIURI
* set to this link's URI will be passed out.
*
* @note The out param, aURI, is guaranteed to be set to a non-null pointer
* when the return value is PR_TRUE.
*
* XXXjwatt: IMO IsInteractiveLink would be a better name.
*/
virtual PRBool IsLink(nsIURI** aURI) const = 0;
/**
* Give this element a chance to fire links that should be fired
* automatically when loaded. If the element was an autoloading link
* and it was successfully handled, we will throw special nsresult values.
*
* @param aShell the current doc shell (to possibly load the link on)
* @throws NS_OK if nothing happened
* @throws NS_XML_AUTOLINK_EMBED if the caller is loading the link embedded
* @throws NS_XML_AUTOLINK_NEW if the caller is loading the link in a new
* window
* @throws NS_XML_AUTOLINK_REPLACE if it is loading a link that will replace
* the current window (and thus the caller must stop parsing)
* @throws NS_XML_AUTOLINK_UNDEFINED if it is loading in any other way--in
* which case, the caller should stop parsing as well.
*/
virtual nsresult MaybeTriggerAutoLink(nsIDocShell *aShell)
{
return NS_OK;
}
/**
* This method is called when the parser finishes creating the element. This
* particularly means that it has done everything you would expect it to have
* done after it encounters the > at the end of the tag (for HTML or XML).
* This includes setting the attributes, setting the document / form, and
* placing the element into the tree at its proper place.
*
* For container elements, this is called *before* any of the children are
* created or added into the tree.
*
* NOTE: this is currently only called for input and button, in the HTML
* content sink. If you want to call it on your element, modify the content
* sink of your choice to do so. This is an efficiency measure.
*
* If you also need to determine whether the parser is the one creating your
* element (through createElement() or cloneNode() generally) then add a
* boolean aFromParser to the NS_NewXXX() constructor for your element and
* have the parser pass true. See nsHTMLInputElement.cpp and
* nsHTMLContentSink::MakeContentObject().
*
* DO NOT USE THIS METHOD to get around the fact that it's hard to deal with
* attributes dynamically. If you make attributes affect your element from
* this method, it will only happen on initialization and JavaScript will not
* be able to create elements (which requires them to first create the
* element and then call setAttribute() directly, at which point
* DoneCreatingElement() has already been called and is out of the picture).
*/
virtual void DoneCreatingElement()
{
}
/**
* Call to let the content node know that it may now have a frame.
* The content node may use this to determine what MayHaveFrame
* returns.
*/
virtual void SetMayHaveFrame(PRBool aMayHaveFrame)
{
}
/**
* @returns PR_TRUE if there is a chance that the content node has a
* frame.
* @returns PR_FALSE otherwise.
*/
virtual PRBool MayHaveFrame() const
{
return PR_TRUE;
}
/**
* This method is called when the parser begins creating the element's
* children, if any are present.
*
* This is only called for XTF elements currently.
*/
virtual void BeginAddingChildren()
{
}
/**
* This method is called when the parser finishes creating the element's children,
* if any are present.
*
* NOTE: this is currently only called for textarea, select, applet, and
* object elements in the HTML content sink. If you want
* to call it on your element, modify the content sink of your
* choice to do so. This is an efficiency measure.
*
* If you also need to determine whether the parser is the one creating your
* element (through createElement() or cloneNode() generally) then add a
* boolean aFromParser to the NS_NewXXX() constructor for your element and
* have the parser pass true. See nsHTMLInputElement.cpp and
* nsHTMLContentSink::MakeContentObject().
*
* It is ok to ignore an error returned from this function. However the
* following errors may be of interest to some callers:
*
* NS_ERROR_HTMLPARSER_BLOCK Returned by script elements to indicate
* that a script will be loaded asynchronously
*
* This means that implementations will have to deal with returned error
* codes being ignored.
*
* @param aHaveNotified Whether there has been a
* ContentInserted/ContentAppended notification for this content node
* yet.
*/
virtual nsresult DoneAddingChildren(PRBool aHaveNotified)
{
return NS_OK;
}
/**
* For HTML textarea, select, applet, and object elements, returns
* PR_TRUE if all children have been added OR if the element was not
* created by the parser. Returns PR_TRUE for all other elements.
* @returns PR_FALSE if the element was created by the parser and
* it is an HTML textarea, select, applet, or object
* element and not all children have been added.
* @returns PR_TRUE otherwise.
*/
virtual PRBool IsDoneAddingChildren()
{
return PR_TRUE;
}
/**
* Method to get the _intrinsic_ content state of this content node. This is
* the state that is independent of the node's presentation. To get the full
* content state, use nsIEventStateManager. Also see nsIEventStateManager
* for the possible bits that could be set here.
*/
// XXXbz this is PRInt32 because all the ESM content state APIs use
// PRInt32. We should really use PRUint32 instead.
virtual PRInt32 IntrinsicState() const;
/* The default script type (language) ID for this content.
All content must support fetching the default script language.
*/
virtual PRUint32 GetScriptTypeID() const
{ return nsIProgrammingLanguage::JAVASCRIPT; }
/* Not all content supports setting a new default language */
virtual nsresult SetScriptTypeID(PRUint32 aLang)
{
NS_NOTREACHED("SetScriptTypeID not implemented");
return NS_ERROR_NOT_IMPLEMENTED;
}
/**
* Get the ID of this content node (the atom corresponding to the
* value of the null-namespace attribute whose name is given by
* GetIDAttributeName(). This may be null if there is no ID.
*/
virtual nsIAtom* GetID() const = 0;
/**
* Get the class list of this content node (this corresponds to the
* value of the null-namespace attribute whose name is given by
* GetClassAttributeName()). This may be null if there are no
* classes, but that's not guaranteed.
*/
const nsAttrValue* GetClasses() const {
if (HasFlag(NODE_MAY_HAVE_CLASS)) {
return DoGetClasses();
}
return nsnull;
}
/**
* Walk aRuleWalker over the content style rules (presentational
* hint rules) for this content node.
*/
NS_IMETHOD WalkContentStyleRules(nsRuleWalker* aRuleWalker) = 0;
/**
* Get the inline style rule, if any, for this content node
*/
virtual nsICSSStyleRule* GetInlineStyleRule() = 0;
/**
* Set the inline style rule for this node. This will send an
* appropriate AttributeChanged notification if aNotify is true.
*/
NS_IMETHOD SetInlineStyleRule(nsICSSStyleRule* aStyleRule, PRBool aNotify) = 0;
/**
* Is the attribute named stored in the mapped attributes?
*
* // XXXbz we use this method in HasAttributeDependentStyle, so svg
* returns true here even though it stores nothing in the mapped
* attributes.
*/
NS_IMETHOD_(PRBool) IsAttributeMapped(const nsIAtom* aAttribute) const = 0;
/**
* Get a hint that tells the style system what to do when
* an attribute on this node changes, if something needs to happen
* in response to the change *other* than the result of what is
* mapped into style data via any type of style rule.
*/
virtual nsChangeHint GetAttributeChangeHint(const nsIAtom* aAttribute,
PRInt32 aModType) const = 0;
/**
* Returns an atom holding the name of the "class" attribute on this
* content node (if applicable). Returns null if there is no
* "class" attribute for this type of content node.
*/
virtual nsIAtom *GetClassAttributeName() const = 0;
/**
* Should be called when the node can become editable or when it can stop
* being editable (for example when its contentEditable attribute changes,
* when it is moved into an editable parent, ...).
*/
virtual void UpdateEditableState();
/**
* Destroy this node and its children. Ideally this shouldn't be needed
* but for now we need to do it to break cycles.
*/
virtual void DestroyContent() = 0;
/**
* Saves the form state of this node and its children.
*/
virtual void SaveSubtreeState() = 0;
private:
/**
* Hook for implementing GetClasses. This is guaranteed to only be
* called if the NODE_MAY_HAVE_CLASS flag is set.
*/
virtual const nsAttrValue* DoGetClasses() const = 0;
public:
#ifdef DEBUG
/**
* List the content (and anything it contains) out to the given
* file stream. Use aIndent as the base indent during formatting.
*/
virtual void List(FILE* out = stdout, PRInt32 aIndent = 0) const = 0;
/**
* Dump the content (and anything it contains) out to the given
* file stream. Use aIndent as the base indent during formatting.
*/
virtual void DumpContent(FILE* out = stdout, PRInt32 aIndent = 0,
PRBool aDumpAll = PR_TRUE) const = 0;
#endif
enum ETabFocusType {
//eTabFocus_textControlsMask = (1<<0), // unused - textboxes always tabbable
eTabFocus_formElementsMask = (1<<1), // non-text form elements
eTabFocus_linksMask = (1<<2), // links
eTabFocus_any = 1 + (1<<1) + (1<<2) // everything that can be focused
};
// Tab focus model bit field:
static PRInt32 sTabFocusModel;
// accessibility.tabfocus_applies_to_xul pref - if it is set to true,
// the tabfocus bit field applies to xul elements.
static PRBool sTabFocusModelAppliesToXUL;
};
NS_DEFINE_STATIC_IID_ACCESSOR(nsIContent, NS_ICONTENT_IID)
// Some cycle-collecting helper macros for nsIContent subclasses
#define NS_IMPL_CYCLE_COLLECTION_TRAVERSE_LISTENERMANAGER \
if (tmp->HasFlag(NODE_HAS_LISTENERMANAGER)) { \
nsContentUtils::TraverseListenerManager(tmp, cb); \
}
#define NS_IMPL_CYCLE_COLLECTION_TRAVERSE_USERDATA \
if (tmp->HasProperties()) { \
nsNodeUtils::TraverseUserData(tmp, cb); \
}
#define NS_IMPL_CYCLE_COLLECTION_UNLINK_LISTENERMANAGER \
if (tmp->HasFlag(NODE_HAS_LISTENERMANAGER)) { \
nsContentUtils::RemoveListenerManager(tmp); \
tmp->UnsetFlags(NODE_HAS_LISTENERMANAGER); \
}
#define NS_IMPL_CYCLE_COLLECTION_UNLINK_USERDATA \
if (tmp->HasProperties()) { \
nsNodeUtils::UnlinkUserData(tmp); \
}
#endif /* nsIContent_h___ */
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