author Justin Lebar <>
Tue, 18 Dec 2012 21:37:35 -0500
changeset 125597 7da46060c2d99f1ddae43c81077fbae0c4366390
parent 125299 463b740c3e2f77925dc48a47979bcf9fa5d27bba
child 125815 6fe383b92b05fd5e6134f207c04ecf2045f301ee
permissions -rw-r--r--
Bug 821440 - Allow the B2G homescreen to run in the background with a decreased oom_score_adj compared to vanilla background apps. r=cjones

/* -*- Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 8 -*- */
/* vim: set sw=4 ts=8 et tw=80 ft=cpp : */

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at */

include protocol PBlob;
include protocol PContent;
include protocol PContentDialog;
include protocol PDocumentRenderer;
include protocol PContentPermissionRequest;
include protocol PRenderFrame;
include protocol POfflineCacheUpdate;
include protocol PIndexedDB;
include DOMTypes;
include URIParams;

include "gfxMatrix.h";
include "FrameMetrics.h";
include "IPC/nsGUIEventIPC.h";
include "mozilla/dom/TabMessageUtils.h";
include "mozilla/dom/PermissionMessageUtils.h";
include "mozilla/layout/RenderFrameUtils.h";

using IPC::Principal;
using gfxMatrix;
using gfxRect;
using gfxSize;
using mozilla::layers::LayersBackend;
using mozilla::layers::FrameMetrics;
using mozilla::layout::ScrollingBehavior;
using mozilla::WindowsHandle;
using nscolor;
using nsCompositionEvent;
using nsIMEUpdatePreference;
using nsIntPoint;
using nsIntRect;
using nsIntSize;
using nsKeyEvent;
using nsMouseEvent;
using nsMouseScrollEvent;
using mozilla::widget::WheelEvent;
using nsQueryContentEvent;
using nsRect;
using nsSelectionEvent;
using nsTextEvent;
using nsTouchEvent;
using RemoteDOMEvent;

namespace mozilla {
namespace dom {

rpc protocol PBrowser
    manager PContent;

    manages PContentDialog;
    manages PDocumentRenderer;
    manages PContentPermissionRequest;
    manages PRenderFrame;
    manages POfflineCacheUpdate;
    manages PIndexedDB;

    AsyncMessage(nsString aMessage, ClonedMessageData aData);

     * When child sends this message, parent should move focus to
     * the next or previous focusable element.
    MoveFocus(bool forward);

    Event(RemoteDOMEvent aEvent);

    rpc CreateWindow() returns (PBrowser window);

    sync SyncMessage(nsString aMessage, ClonedMessageData aData)
      returns (nsString[] retval);

     * The IME sequence number (seqno) parameter is used to make sure
     * that a notification is discarded if it arrives at the chrome process
     * too late. If the notification is late and we accept it, we will have
     * an out-of-date view of the content process, which means events that we
     * dispatch based on this out-of-date view will be wrong also.
     * (see Bug 599550 and Bug 591047 comments 44, 50, and 54)
     * Chrome increments seqno and includes it in each IME event sent to
     * content, and content sends its current seqno back to chrome with each
     * notification. A notification is up-to-date only if the content
     * seqno is the same as the current chrome seqno, meaning no additional
     * event was sent to content before the notification was received
     * On blur, chrome returns the current seqno to content, and content
     * uses it to discard subsequent events until the content seqno and
     * chrome seqno-on-blur match again. These events, meant for the blurred
     * textfield, are discarded to prevent events going to the wrong target

     * Notifies chrome that there is a focus change involving an editable
     * object (input, textarea, document, contentEditable. etc.)
     *  focus        PR_TRUE if editable object is receiving focus
     *               PR_FALSE if losing focus
     *  preference   Native widget preference for IME updates
     *  seqno        Current seqno value on the chrome side
    sync NotifyIMEFocus(bool focus)
      returns (nsIMEUpdatePreference preference, uint32_t seqno);

     * Notifies chrome that there has been a change in text content
     * One call can encompass both a delete and an insert operation
     * Only called when NotifyIMEFocus returns PR_TRUE for mWantUpdates
     *  offset       Starting offset of the change
     *  end          Ending offset of the range deleted
     *  newEnd       New ending offset after insertion
     *  for insertion, offset == end
     *  for deletion, offset == newEnd
    NotifyIMETextChange(uint32_t offset, uint32_t end, uint32_t newEnd);

     * Notifies chrome that there has been a change in selection
     * Only called when NotifyIMEFocus returns PR_TRUE for mWantUpdates
     *  seqno        Current seqno value on the content side
     *  anchor       Offset where the selection started
     *  focus        Offset where the caret is
    NotifyIMESelection(uint32_t seqno, uint32_t anchor, uint32_t focus);

     * Notifies chrome to refresh its text cache 
     * Only called when NotifyIMEFocus returns PR_TRUE for mWantHints
     *  text         The entire content of the text field
    NotifyIMETextHint(nsString text);

     * Instructs chrome to end any pending composition
     *  cancel       PR_TRUE if composition should be cancelled
     *  composition  Text to commit before ending the composition
     *  if cancel is PR_TRUE,
     *    widget should return empty string for composition
     *  if cancel is PR_FALSE,
     *    widget should return the current composition text
    sync EndIMEComposition(bool cancel) returns (nsString composition);

    sync GetInputContext() returns (int32_t IMEEnabled, int32_t IMEOpen,
                                    intptr_t NativeIMEContext);

    SetInputContext(int32_t IMEEnabled,
                    int32_t IMEOpen,
                    nsString type,
                    nsString inputmode,
                    nsString actionHint,
                    int32_t cause,
                    int32_t focusChange);

     * Gets the DPI of the screen corresponding to this browser.
    sync GetDPI() returns (float value);

     * Return native data of root widget
    sync GetWidgetNativeData() returns (WindowsHandle value);

    SetCursor(uint32_t value);
    SetBackgroundColor(nscolor color);

     * Initiates an asynchronous request for permission for the
     * provided principal.
     * @param aType
     *   The type of permission to request.
     * @param aAccess
     *   Access type. "read" for example.
     * @param aPrincipal
     *   The principal of the request.
     * NOTE: The principal is untrusted in the parent process. Only
     *       principals that can live in the content process should
     *       provided.
    PContentPermissionRequest(nsCString aType, nsCString aAccess, Principal principal);

    PContentDialog(uint32_t aType, nsCString aName, nsCString aFeatures,
                   int32_t[] aIntParams, nsString[] aStringParams);

     * Create a layout frame (encapsulating a remote layer tree) for
     * the page that is currently loaded in the <browser>.
    sync PRenderFrame()
        returns (ScrollingBehavior scrolling,
                 LayersBackend backend, int32_t maxTextureSize, uint64_t layersId);

     * Starts an offline application cache update.
     * @param manifestURI
     *   URI of the manifest to fetch, the application cache group ID
     * @param documentURI
     *   URI of the document that referred the manifest
     * @param clientID
     *   The group cache version identifier to use
     * @param stickDocument
     *   True if the update was initiated by a document load that referred
     *   a manifest.
     *   False if the update was initiated by applicationCache.update() call.
     *   Tells the update to carry the documentURI to a potential separate 
     *   update of implicit (master) items.
     *   Why this argument? If the document was not found in an offline cache 
     *   before load and refers a manifest and this manifest itself has not 
     *   been changed since the last fetch, we will not do the application 
     *   cache group update. But we must cache the document (identified by the
     *   documentURI). This argument will ensure that a previously uncached 
     *   document will get cached and that we don't re-cache a document that 
     *   has already been cached (stickDocument=false).
    POfflineCacheUpdate(URIParams manifestURI, URIParams documentURI,
                        bool isInBrowserElement, uint32_t appId,
                        bool stickDocument);

    sync PIndexedDB(nsCString asciiOrigin)
        returns (bool allowed);

     * from inside <iframe mozbrowser> is special.  When the child
     * process calls, it creates a new PBrowser (in its own
     * process), then calls BrowserFrameOpenWindow on it.
     * The parent process gets a chance to accept or reject the
     * call, and windowOpened is set to true if we ended up going through with
     * the
     * @param opener the PBrowser whose content called
    sync BrowserFrameOpenWindow(PBrowser opener, nsString aURL,
                                nsString aName, nsString aFeatures)
      returns (bool windowOpened);

     * Instructs the TabParent to forward a request to zoom to a rect given in
     * CSS pixels. This rect is relative to the document.
    ZoomToRect(gfxRect aRect);

     * We know for sure that content has either preventDefaulted or not
     * preventDefaulted. This applies to an entire batch of touch events. It is
     * expected that, if there are any DOM touch listeners, touch events will be
     * batched and only processed for panning and zooming if content does not
     * preventDefault.
    ContentReceivedTouch(bool aPreventDefault);

     * Updates any zoom constraints on the parent and anything tied to it. This
     * is useful for control logic that resides outside of the remote browser.
    UpdateZoomConstraints(bool aAllowZoom, float aMinZoom, float aMaxZoom);


     * Notify the remote browser that it has been Show()n on this
     * side, with the given |visibleRect|.  This message is expected
     * to trigger creation of the remote browser's "widget".
     * |Show()| and |Move()| take IntSizes rather than Rects because
     * content processes always render to a virtual <0, 0> top-left
     * point.
    Show(nsIntSize size);

    LoadURL(nsCString uri);

    UpdateDimensions(nsRect rect, nsIntSize size) compress;

    UpdateFrame(FrameMetrics frame) compress;

     * Requests handling of a double tap. |point| is in CSS pixels, relative to
     * the scroll offset. This message is expected to round-trip back to
     * ZoomToRect() with a rect indicating where we should zoom to.
    HandleDoubleTap(nsIntPoint point);

     * Requests handling of a single tap. |point| is in CSS pixels, relative to
     * the scroll offset. This message is expected to send a "mousedown" and
     * "mouseup" series of events at this point.
    HandleSingleTap(nsIntPoint point);

     * Requests handling of a long tap. |point| is in CSS pixels, relative to
     * the scroll offset. This message is expected to send a "contextmenu"
     * events at this point.
    HandleLongTap(nsIntPoint point);

     * Sending an activate message moves focus to the child.


     * @see nsIDOMWindowUtils sendMouseEvent.
    MouseEvent(nsString aType,
               float aX,
               float aY,
               int32_t aButton,
               int32_t aClickCount,
               int32_t aModifiers,
               bool aIgnoreRootScrollFrame);

    RealMouseEvent(nsMouseEvent event);
    RealKeyEvent(nsKeyEvent event);
    MouseWheelEvent(WheelEvent event);
    RealTouchEvent(nsTouchEvent event);
    // We use a separate message for touchmove events only to apply
    // compression to them.
    RealTouchMoveEvent(nsTouchEvent event) compress;

     * @see nsIDOMWindowUtils sendKeyEvent.
    KeyEvent(nsString aType,
             int32_t aKeyCode,
             int32_t aCharCode,
             int32_t aModifiers,
             bool aPreventDefault);

    CompositionEvent(nsCompositionEvent event);

    TextEvent(nsTextEvent event);

    SelectionEvent(nsSelectionEvent event);

     * Activate event forwarding from client to parent.
    ActivateFrameEvent(nsString aType, bool capture);

    LoadRemoteScript(nsString aURL);

     * Create a asynchronous request to render whatever document is
     * loaded in the child when this message arrives.  When the
     * request finishes, PDocumentRenderer:__delete__ is sent back to
     * this side to notify completion.
     * |documentRect| is the area of the remote document to draw,
     * transformed by |transform|.  The rendered area will have the
     * default background color |bgcolor|.  |renderFlags| are the
     * nsIPresShell::RenderDocument() flags to use on the remote side,
     * and if true, |flushLayout| will do just that before rendering
     * the document.  The rendered image will be of size |renderSize|.
    PDocumentRenderer(nsRect documentRect, gfxMatrix transform,
                      nsString bgcolor,
                      uint32_t renderFlags, bool flushLayout,
                      nsIntSize renderSize);

     * Send the child its app type.  The app type identifies the kind of app
     * shown in this PBrowser.  Currently, the only recognized app type is
     * "homescreen".
     * The value here corresponds to the "mozapptype" attribute on iframes.  For
     * example, <iframe mozbrowser mozapp="..." mozapptype="homescreen">.
     * Only app frames (i.e., frames with an app-id) should have a non-empty app
     * type.  If you try to SetAppType() with a non-empty app type on a non-app
     * PBrowserChild, we may assert.
    SetAppType(nsString appType);

     * Sent by the chrome process when it no longer wants this remote
     * <browser>.  The child side cleans up in response, then
     * finalizing its death by sending back __delete__() to the
     * parent.

 * FIXME: write protocol!

state LIVE:
    send LoadURL goto LIVE;
    send Destroy goto DYING;

state DYING:
    discard send blah;
// etc.
    recv __delete__;