forked from mirrors/gecko-dev
190 lines
7 KiB
Text
190 lines
7 KiB
Text
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* 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 "imgINotificationObserver.idl"
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%{C++
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#include "mozilla/Maybe.h"
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#include "Visibility.h"
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%}
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interface imgIRequest;
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interface nsIChannel;
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interface nsIStreamListener;
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interface nsIURI;
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interface nsIDocument;
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interface nsIFrame;
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[ref] native MaybeOnNonvisible(const mozilla::Maybe<mozilla::OnNonvisible>);
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native Visibility(mozilla::Visibility);
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/**
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* This interface represents a content node that loads images. The interface
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* exists to allow getting information on the images that the content node
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* loads and to allow registration of observers for the image loads.
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*
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* Implementors of this interface should handle all the mechanics of actually
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* loading an image -- getting the URI, checking with content policies and
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* the security manager to see whether loading the URI is allowed, performing
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* the load, firing any DOM events as needed.
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*
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* An implementation of this interface may support the concepts of a
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* "current" image and a "pending" image. If it does, a request to change
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* the currently loaded image will start a "pending" request which will
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* become current only when the image is loaded. It is the responsibility of
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* observers to check which request they are getting notifications for.
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*
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* Please make sure to update the MozImageLoadingContent WebIDL
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* interface to mirror this interface when changing it.
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*/
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// We can't make this interface noscript yet, because there is JS code doing
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// "instanceof Ci.nsIImageLoadingContent" and using the nsIImageLoadingContent
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// constants.
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[scriptable, builtinclass, uuid(0357123d-9224-4d12-a47e-868c32689777)]
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interface nsIImageLoadingContent : imgINotificationObserver
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{
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/**
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* Request types. Image loading content nodes attempt to do atomic
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* image changes when the image url is changed. This means that
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* when the url changes the new image load will start, but the old
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* image will remain the "current" request until the new image is
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* fully loaded. At that point, the old "current" request will be
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* discarded and the "pending" request will become "current".
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*/
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const long UNKNOWN_REQUEST = -1;
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const long CURRENT_REQUEST = 0;
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const long PENDING_REQUEST = 1;
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/**
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* setLoadingEnabled is used to enable and disable loading in
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* situations where loading images is unwanted. Note that enabling
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* loading will *not* automatically trigger an image load.
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*/
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[notxpcom, nostdcall] void setLoadingEnabled(in boolean aEnabled);
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/**
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* Returns the image blocking status (@see nsIContentPolicy). This
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* will always be an nsIContentPolicy REJECT_* status for cases when
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* the image was blocked. This status always refers to the
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* CURRENT_REQUEST load.
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*/
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[noscript] readonly attribute short imageBlockingStatus;
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/**
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* Used to register an image decoder observer. Typically, this will
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* be a proxy for a frame that wants to paint the image.
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* Notifications from ongoing image loads will be passed to all
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* registered observers. Notifications for all request types,
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* current and pending, will be passed through.
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*
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* @param aObserver the observer to register
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*/
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[notxpcom, nostdcall] void addNativeObserver(in imgINotificationObserver aObserver);
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/**
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* Used to unregister an image decoder observer.
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*
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* @param aObserver the observer to unregister
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*/
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[notxpcom, nostdcall] void removeNativeObserver(in imgINotificationObserver aObserver);
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/**
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* Accessor to get the image requests
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*
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* @param aRequestType a value saying which request is wanted
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*
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* @return the imgIRequest object (may be null, even when no error
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* is thrown)
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*
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* @throws NS_ERROR_UNEXPECTED if the request type requested is not
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* known
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*/
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[noscript] imgIRequest getRequest(in long aRequestType);
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/**
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* Call this function when the request was blocked by any of the
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* security policies enforced.
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*
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* @param aContentDecision the decision returned from nsIContentPolicy
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* (any of the types REJECT_*)
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*/
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[notxpcom, nostdcall] void setBlockedRequest(in int16_t aContentDecision);
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/**
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* Used to notify the image loading content node that a frame has been
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* created.
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*/
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[notxpcom] void frameCreated(in nsIFrame aFrame);
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/**
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* Used to notify the image loading content node that a frame has been
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* destroyed.
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*/
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[notxpcom] void frameDestroyed(in nsIFrame aFrame);
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/**
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* Used to find out what type of request one is dealing with (eg
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* which request got passed through to the imgINotificationObserver
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* interface of an observer)
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*
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* @param aRequest the request whose type we want to know
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*
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* @return an enum value saying what type this request is
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*
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* @throws NS_ERROR_UNEXPECTED if aRequest is not known
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*/
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[noscript] long getRequestType(in imgIRequest aRequest);
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/**
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* Gets the URI of the current request, if available.
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* Otherwise, returns the last URI that this content tried to load, or
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* null if there haven't been any such attempts.
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*/
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[noscript] readonly attribute nsIURI currentURI;
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/**
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* loadImageWithChannel allows data from an existing channel to be
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* used as the image data for this content node.
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*
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* @param aChannel the channel that will deliver the data
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*
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* @return a stream listener to pump the image data into
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*
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* @see imgILoader::loadImageWithChannel
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*
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* @throws NS_ERROR_NULL_POINTER if aChannel is null
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*/
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[noscript] nsIStreamListener loadImageWithChannel(in nsIChannel aChannel);
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/**
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* Enables/disables image state forcing. When |aForce| is true, we force
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* nsImageLoadingContent::ImageState() to return |aState|. Call again with |aForce|
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* as false to revert ImageState() to its original behaviour.
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*/
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[notxpcom, nostdcall] void forceImageState(in boolean aForce, in unsigned long long aState);
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/**
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* The intrinsic size and width of this content. May differ from actual image
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* size due to things like responsive image density.
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*/
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[noscript] readonly attribute unsigned long naturalWidth;
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[noscript] readonly attribute unsigned long naturalHeight;
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/**
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* Called by layout to announce when the frame associated with this content
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* has changed its visibility state.
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*
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* @param aNewVisibility The new visibility state.
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* @param aNonvisibleAction A requested action if the frame has become
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* nonvisible. If Nothing(), no action is
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* requested. If DISCARD_IMAGES is specified, the
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* frame is requested to ask any images it's
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* associated with to discard their surfaces if
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* possible.
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*/
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[noscript, notxpcom] void onVisibilityChange(in Visibility aNewVisibility,
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in MaybeOnNonvisible aNonvisibleAction);
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};
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