gecko-dev/dom/browser-element/BrowserElementParent.h

142 lines
5.3 KiB
C++

/* 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 http://mozilla.org/MPL/2.0/. */
#ifndef mozilla_BrowserElementHelpers_h
#define mozilla_BrowserElementHelpers_h
#include "nsAString.h"
#include "mozilla/gfx/Point.h"
#include "mozilla/gfx/Rect.h"
#include "Units.h"
#include "mozilla/dom/Element.h"
class nsIDOMWindow;
class nsIURI;
namespace mozilla {
namespace dom {
class TabParent;
}
/**
* BrowserElementParent implements a portion of the parent-process side of
* <iframe mozbrowser>.
*
* Most of the parent-process side of <iframe mozbrowser> is implemented in
* BrowserElementParent.js. This file implements the few parts of this
* functionality which must be written in C++.
*
* We don't communicate with the JS code that lives in BrowserElementParent.js;
* the JS and C++ parts are completely separate.
*/
class BrowserElementParent
{
public:
/**
* Possible results from a window.open call.
* ADDED - The frame was added to a document (i.e. handled by the embedder).
* IGNORED - The frame was not added to a document and the embedder didn't
* call preventDefault() to prevent the platform from handling the call.
* CANCELLED - The frame was not added to a document, but the embedder still
* called preventDefault() to prevent the platform from handling the call.
*/
enum OpenWindowResult {
OPEN_WINDOW_ADDED,
OPEN_WINDOW_IGNORED,
OPEN_WINDOW_CANCELLED
};
/**
* Handle a window.open call from an out-of-process <iframe mozbrowser>.
*
* window.open inside <iframe mozbrowser> doesn't actually open a new
* top-level window. Instead, the "embedder" (the document which contains
* the <iframe mozbrowser> whose content called window.open) gets the
* opportunity to place a new <iframe mozbrowser> in the DOM somewhere. This
* new "popup" iframe acts as the opened window.
*
* This method proceeds in three steps.
*
* 1) We fire a mozbrowseropenwindow CustomEvent on the opener
* iframe element. This event's detail is an instance of
* OpenWindowEventDetail.
*
* 2) The embedder (the document which contains the opener iframe) can accept
* the window.open request by inserting event.detail.frameElement (an iframe
* element) into the DOM somewhere.
*
* 3) If the embedder accepted the window.open request, we return true and
* set aPopupTabParent's frame element to event.detail.frameElement.
* Otherwise, we return false.
*
* @param aURL the URL the new window should load. The empty string is
* allowed.
* @param aOpenerTabParent the TabParent whose TabChild called window.open.
* @param aPopupTabParent the TabParent inside which the opened window will
* live.
* @return an OpenWindowresult that describes whether the embedder added the
* frame to a document and whether it called preventDefault to prevent
* the platform from handling the open request.
*/
static OpenWindowResult
OpenWindowOOP(dom::TabParent* aOpenerTabParent,
dom::TabParent* aPopupTabParent,
const nsAString& aURL,
const nsAString& aName,
const nsAString& aFeatures);
/**
* Handle a window.open call from an in-process <iframe mozbrowser>.
*
* (These parameter types are silly, but they match what our caller has in
* hand. Feel free to add an override, if they are inconvenient to you.)
*
* @param aURI the URI the new window should load. May be null.
* @return an OpenWindowResult that describes whether the browser added the
* frame to a document or whether they called preventDefault to prevent
* the platform from handling the open request
*/
static OpenWindowResult
OpenWindowInProcess(nsIDOMWindow* aOpenerWindow,
nsIURI* aURI,
const nsAString& aName,
const nsACString& aFeatures,
nsIDOMWindow** aReturnWindow);
/**
* Fire a mozbrowserasyncscroll CustomEvent on the given TabParent's frame element.
* This event's detail is an instance of nsIAsyncScrollEventDetail.
*
* @param aContentRect: The portion of the page which is currently visible
* onscreen in CSS pixels.
*
* @param aContentSize: The content width/height in CSS pixels.
*
* aContentRect.top + aContentRect.height may be larger than aContentSize.height.
* This indicates that the content is over-scrolled, which occurs when the
* page "rubber-bands" after being scrolled all the way to the bottom.
* Similarly, aContentRect.left + aContentRect.width may be greater than
* contentSize.width, and both left and top may be negative.
*/
static bool
DispatchAsyncScrollEvent(dom::TabParent* aTabParent,
const CSSRect& aContentRect,
const CSSSize& aContentSize);
private:
static OpenWindowResult
DispatchOpenWindowEvent(dom::Element* aOpenerFrameElement,
dom::Element* aPopupFrameElement,
const nsAString& aURL,
const nsAString& aName,
const nsAString& aFeatures);
};
} // namespace mozilla
#endif