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pjs/extensions/xforms/nsXFormsModelElement.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 XForms support.
*
* The Initial Developer of the Original Code is
* IBM Corporation.
* Portions created by the Initial Developer are Copyright (C) 2004
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Brian Ryner <bryner@brianryner.com>
* Olli Pettay <Olli.Pettay@helsinki.fi>
*
* Alternatively, the contents of this file may be used under the terms of
* either 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 nsXFormsModelElement_h_
#define nsXFormsModelElement_h_
#include "nsXFormsStubElement.h"
#include "nsIModelElementPrivate.h"
#include "nsIXFormsNSModelElement.h"
#include "nsIDOMEventListener.h"
#include "nsISchema.h"
#include "nsCOMArray.h"
#include "nsVoidArray.h"
#include "nsCOMPtr.h"
#include "nsIDOMDocument.h"
#include "nsIDOMNodeList.h"
#include "nsXFormsMDGEngine.h"
#include "nsXFormsUtils.h"
#include "nsIClassInfo.h"
#include "nsISchemaLoader.h"
#include "nsISchema.h"
#include "nsIXFormsContextControl.h"
#include "nsDataHashtable.h"
class nsIDOMElement;
class nsIDOMNode;
class nsIDOMXPathEvaluator;
class nsIDOMXPathResult;
class nsXFormsControl;
class nsXFormsModelInstanceDocuments;
/**
* Implementation of the instance node list returned by
* nsIXFormsModel::getInstanceDocuments.
*
* Manages the list of all instance elements that belong to a given
* nsXFormsModelElement.
*/
class nsXFormsModelInstanceDocuments : public nsIDOMNodeList,
public nsIClassInfo
{
public:
nsXFormsModelInstanceDocuments();
NS_DECL_ISUPPORTS
NS_DECL_NSICLASSINFO
NS_DECL_NSIDOMNODELIST
/**
* Add an instance element
*
* @param aInstance The new instance element
*/
void AddInstance(nsIInstanceElementPrivate *aInstance);
/**
* Remove an instance element
*
* @param aInstance The instance element
*/
void RemoveInstance(nsIInstanceElementPrivate *aInstance);
/**
* Get the instance document at a given index
*
* @note Does NOT addref the returned element!
*
* @param aIndex The index
* @return The instance element (or nsnull if not found)
*/
nsIInstanceElementPrivate* GetInstanceAt(PRUint32 aIndex);
/**
* Instructs the class to drop references to all instance elements
*/
void DropReferences();
protected:
/** The array holding the instance elements */
nsCOMArray<nsIInstanceElementPrivate> mInstanceList;
};
/**
* A class for storing pointers to XForms controls added to an XForms
* model. Organized as a tree, with pointers to first child and next sibling.
*
* Notes:
* 1) The root node is special; only has children and a nsnull mNode.
* 2) All functions operate on the node they are called on, and its
* subtree. Functions will never go up (as in: nearer the root) in the tree.
*/
class nsXFormsControlListItem
{
/** The XForms control itself */
nsCOMPtr<nsIXFormsControl> mNode;
/** The next sibling of the node */
nsXFormsControlListItem *mNextSibling;
/** The first child of the node */
nsXFormsControlListItem *mFirstChild;
nsDataHashtable<nsISupportsHashKey,nsXFormsControlListItem *> *mControlListHash;
public:
/** The constructor takes a hashtable pointer, which needs to point to the
* model's hashtable. This is so that each item in the control list has
* access to the same hashtable and can add/remove items from it and find
* items in it.
*/
nsXFormsControlListItem(
nsIXFormsControl* aControl,
nsDataHashtable<nsISupportsHashKey,nsXFormsControlListItem *> *aHash);
nsXFormsControlListItem();
~nsXFormsControlListItem();
nsXFormsControlListItem(const nsXFormsControlListItem& aCopy);
/** Clear contents of current node, all siblings, and all children */
void Clear();
/**
* Remove a control from the current (sub-) tree. Will search from that node
* and down in the tree for the node.
*
* @param aControl The control to remove
* @param aRemoved Was the control found and removed?
*/
nsresult RemoveControl(nsIXFormsControl *aControl, PRBool &aRemoved);
/**
* Add a control to the (sub-) tree as a child to the given |aParent|. If
* there is no |aParent|, it will insert it as a sibling to |this|. If
* |aParent| is not found, it will bail.
*
* @param aControl The control to insert
* @param aParent The (eventual) parent to insert it under
*/
nsresult AddControl(nsIXFormsControl *aControl,
nsIXFormsControl *aParent);
/**
* Find a control in the (sub-) tree.
*
* @param aControl The control to find
*/
nsXFormsControlListItem* FindControl(nsIXFormsControl *aControl);
/**
* Return the nsIXFormsControl that this node contains.
*/
already_AddRefed<nsIXFormsControl> Control();
/** Return the first child of the node */
nsXFormsControlListItem* FirstChild() { return mFirstChild; };
/** Return the next sibling of the node */
nsXFormsControlListItem* NextSibling() { return mNextSibling; };
/**
* An iterator implementation for the class.
*/
class iterator
{
private:
/** The control the iterator is currently pointing at */
nsXFormsControlListItem *mCur;
/** A stack of non-visited nodes */
nsVoidArray mStack;
public:
iterator();
iterator(const iterator&);
iterator operator=(nsXFormsControlListItem*);
bool operator!=(const nsXFormsControlListItem*);
iterator operator++();
nsXFormsControlListItem* operator*();
};
friend class nsXFormsControlListItem::iterator;
/** The begining position for the node (itself) */
nsXFormsControlListItem* begin();
/** The end position for the node (nsnull) */
nsXFormsControlListItem* end();
};
/**
* Implementation of the XForms \<model\> element.
*
* This includes all of the code for loading the model's external resources and
* initializing the model and its controls.
*
* @see http://www.w3.org/TR/xforms/slice3.html#structure-model
*/
class nsXFormsModelElement : public nsXFormsStubElement,
public nsIModelElementPrivate,
public nsIXFormsNSModelElement,
public nsISchemaLoadListener,
public nsIDOMEventListener,
public nsIXFormsContextControl
{
public:
nsXFormsModelElement() NS_HIDDEN;
NS_DECL_ISUPPORTS_INHERITED
NS_DECL_NSIXFORMSMODELELEMENT
NS_DECL_NSIMODELELEMENTPRIVATE
NS_DECL_NSIXFORMSNSMODELELEMENT
NS_DECL_NSISCHEMALOADLISTENER
NS_DECL_NSIWEBSERVICEERRORHANDLER
NS_DECL_NSIDOMEVENTLISTENER
NS_DECL_NSIXFORMSCONTEXTCONTROL
// nsIXTFElement overrides
NS_IMETHOD OnDestroyed();
NS_IMETHOD GetScriptingInterfaces(PRUint32 *aCount, nsIID ***aArray);
NS_IMETHOD WillChangeDocument(nsIDOMDocument *aNewDocument);
NS_IMETHOD DocumentChanged(nsIDOMDocument *aNewDocument);
NS_IMETHOD DoneAddingChildren();
NS_IMETHOD HandleDefault(nsIDOMEvent *aEvent, PRBool *aHandled);
NS_IMETHOD OnCreated(nsIXTFElementWrapper *aWrapper);
// nsIXFormsControlBase overrides
NS_IMETHOD Bind(PRBool *aContextChanged) {
// dummy method, so does nothing
return NS_OK;
};
NS_IMETHOD GetOnDeferredBindList(PRBool *onList) {
// dummy method, so does nothing
return NS_OK;
};
NS_IMETHOD SetOnDeferredBindList(PRBool putOnList) {
// dummy method, so does nothing
return NS_OK;
};
// Called after nsXFormsAtoms is registered
static NS_HIDDEN_(void) Startup();
/**
* The models are not ready for binding, so defer the binding of the control
* by storing it as a property on the document. The models will run through
* this list when they are ready for binding.
*
* @param aControl XForms control waiting to be bound
*/
static NS_HIDDEN_(nsresult) DeferElementBind(nsIXFormsControl *aControl);
static nsresult NeedsPostRefresh(nsIXFormsControl* aControl);
// Sometimes a child that is on the post refresh list will want to force
// its containing xforms control to refresh. Like if an xf:item's label
// refreshes, it wants to reflect any of its changes in the xf:select or
// xf:select1 that contains it. This function will try to minimize that by
// allowing xforms controls that function as containers (like select/select1)
// to defer their refresh until most or all of its children have refreshed.
// Well, at least until every control on the sPostRefreshList has been
// processed. This will return PR_TRUE if the refresh will be deferred.
static PRBool ContainerNeedsPostRefresh(nsIXFormsControl* aControl);
static void CancelPostRefresh(nsIXFormsControl* aControl);
/**
* Returns the DOM element for the model.
*/
already_AddRefed<nsIDOMElement> GetDOMElement();
private:
NS_HIDDEN_(already_AddRefed<nsIDOMDocument>)
FindInstanceDocument(const nsAString &aID);
NS_HIDDEN_(void) Reset();
NS_HIDDEN_(void) BackupOrRestoreInstanceData(PRBool restore);
/** Initializes the MIPs on all form controls */
NS_HIDDEN_(nsresult) InitializeControls();
NS_HIDDEN_(nsresult) InitializeInstances();
NS_HIDDEN_(nsresult) ProcessBindElements();
NS_HIDDEN_(nsresult) FinishConstruction();
NS_HIDDEN_(nsresult) ConstructDone();
NS_HIDDEN_(void) MaybeNotifyCompletion();
NS_HIDDEN_(nsresult) ProcessBind(nsIDOMXPathEvaluator *aEvaluator,
nsIDOMNode *aContextNode,
PRInt32 aContextPosition,
PRInt32 aContextSize,
nsIDOMElement *aBindElement,
PRBool aIsOuter = PR_FALSE);
NS_HIDDEN_(void) RemoveModelFromDocument();
/**
* Sets the state of a specific state.
*
* @param aElement The element to dispatch events to and set states on
* @param aState The state value
* @param aOnEvent The on event for the state.
*/
NS_HIDDEN_(void) SetSingleState(nsIDOMElement *aElement,
PRBool aState,
nsXFormsEvent aOnEvent);
/**
* Handle controls bindings which was deferred because the model was not
* ready.
*
* @note Only registers the controls with the model. Does not setup
* bindings, etc.
*
* @param aDoc Document that contains the XForms control
*/
static NS_HIDDEN_(void) ProcessDeferredBinds(nsIDOMDocument *aDoc);
// Returns true when all external documents have been loaded
PRBool IsComplete() const { return (mSchemaTotal == mSchemaCount
&& mPendingInstanceCount == 0); }
/**
* Called by HandleEvent. Event handler for the 'DOMContentLoaded' event.
*/
NS_HIDDEN_(nsresult) HandleLoad(nsIDOMEvent *aEvent);
/**
* Called by HandleEvent. Event handler for the 'unload' event.
*/
NS_HIDDEN_(nsresult) HandleUnload(nsIDOMEvent *aEvent);
NS_HIDDEN_(nsresult) RefreshSubTree(nsXFormsControlListItem *aCurrent,
PRBool aForceRebind);
NS_HIDDEN_(nsresult) ValidateDocument(nsIDOMDocument *aInstanceDocument,
PRBool *aResult);
/**
* Request to send an update event to the model. If an update is already
* running, the event will be queued, and sent after that. If multiple
* events are queued, they will be dispatched FIFO order.
*
* @param aEvent The requested event
*/
NS_HIDDEN_(nsresult) RequestUpdateEvent(nsXFormsEvent aEvent);
/**
* Returns true if a schema has already been registered to address the same
* namespace as aSchemaElement. Per section 3.3.1 of the XForms spec:
* Within each XForms Model, there is a limit of one Schema per namespace
* declaration, including inline and linked Schemas.
*
* @param aSchemaElement The schema element
*/
PRBool IsDuplicateSchema(nsIDOMElement *aSchemaElement);
/**
* Validate all the instance documents.
*/
void ValidateInstanceDocuments();
/**
* Starting with aType, walks through the builtin derived types back to the
* builtin primative type, appending the datatype URIs to the string array as
* it goes
*/
NS_HIDDEN_(nsresult) AppendBuiltinTypes(PRUint16 aType,
nsStringArray *aBuiltinType);
/**
* Starting from aType, walks the chain of datatype extension/derivation to
* gather information.
*
* @param aType The type we are trying to find datatype information
* for
* @param aBuiltinType If non-null, we'll return the root primative type
* of aType in this buffer
* @param aTypeArray If aBuiltinType is nsnull, we'll build a string
* array of datatype URIs and put them in aTypeArray.
*/
NS_HIDDEN_(nsresult) WalkTypeChainInternal(nsISchemaType *aType,
PRUint16 *aBuiltinType,
nsStringArray *aTypeArray);
/**
* Returns the primative type that aSchemaType is derived/extended from
*/
NS_HIDDEN_(nsresult) BuiltinTypeToPrimative(nsISchemaBuiltinType *aSchemaType,
PRUint16 *aPrimType);
nsIDOMElement *mElement;
nsCOMPtr<nsISchemaLoader> mSchemas;
nsStringArray mPendingInlineSchemas;
nsXFormsControlListItem mFormControls;
nsDataHashtable<nsISupportsHashKey,nsXFormsControlListItem *> mControlListHash;
PRInt32 mSchemaCount;
PRInt32 mSchemaTotal;
PRInt32 mPendingInstanceCount;
/** The MDG for this model */
nsXFormsMDGEngine mMDG;
/**
* List of changed nodes, ie. nodes that have not been informed about
* changes yet
*/
nsCOMArray<nsIDOMNode> mChangedNodes;
/**
* This flag indicates whether or not the document has fired
* DOMContentLoaded
*/
PRPackedBool mDocumentLoaded;
/**
* Indicates whether all controls should be refreshed on the next Refresh()
* run.
*/
PRPackedBool mRebindAllControls;
/**
* Indicates whether instance elements have been initialized
*/
PRPackedBool mInstancesInitialized;
/**
* Indicates whether the model has handled the xforms-ready event
*/
PRPackedBool mReadyHandled;
/**
* Indicates whether the model's instance was built by lazy authoring
*/
PRPackedBool mLazyModel;
/**
* Indicates whether the model has handled the xforms-model-construct-done
* event
*/
PRPackedBool mConstructDoneHandled;
/**
* Indicates whether the model is currently processing an update event,
* ie. xforms-rebuild, xforms-recalculate, xforms-revalidate, or
* xforms-refresh.
*/
PRPackedBool mProcessingUpdateEvent;
/**
* A list of update events that have been queued, because they were
* requested while another update was running.
*/
nsVoidArray mUpdateEventQueue;
/**
* The maximum allowed number of iterations of queued event dispatching in
* RequestUpdateEvent(), before there is believe to be a loop, and
* processing stops.
*/
PRInt32 mLoopMax;
/**
* All instance documents contained by this model, including lazy-authored
* instance documents.
*/
nsRefPtr<nsXFormsModelInstanceDocuments> mInstanceDocuments;
/**
* Type information for nodes, with their type set through \<xforms:bind\>.
*
* @see http://www.w3.org/TR/xforms/slice6.html#model-prop-type
*/
nsClassHashtable<nsISupportsHashKey, nsString> mNodeToType;
/**
* P3P type information for nodes, with their type set through
* \<xforms:bind\>.
* @see http://www.w3.org/TR/xforms/slice6.html#model-prop-p3ptype
*/
nsClassHashtable<nsISupportsHashKey, nsString> mNodeToP3PType;
friend class Updating;
};
/**
* nsPostRefresh is needed by the UI Controls, which are implemented in
* XBL and used inside \<repeat\>. It is needed to refresh the controls,
* because XBL bindings are attached to XForms controls *after* refreshing
* the \<repeat\>.
*/
class nsPostRefresh {
public:
nsPostRefresh();
~nsPostRefresh();
static const nsVoidArray* PostRefreshList();
};
NS_HIDDEN_(nsresult) NS_NewXFormsModelElement(nsIXTFElement **aResult);
#endif
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