зеркало из https://github.com/mozilla/gecko-dev.git
117 строки
4.3 KiB
C++
117 строки
4.3 KiB
C++
/* 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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#ifndef mozilla_BrowserElementHelpers_h
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#define mozilla_BrowserElementHelpers_h
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#include "nsAString.h"
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#include "mozilla/gfx/Point.h"
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#include "mozilla/gfx/Rect.h"
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#include "Units.h"
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class nsIDOMWindow;
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class nsIURI;
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namespace mozilla {
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namespace dom {
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class TabParent;
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}
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/**
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* BrowserElementParent implements a portion of the parent-process side of
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* <iframe mozbrowser>.
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*
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* Most of the parent-process side of <iframe mozbrowser> is implemented in
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* BrowserElementParent.js. This file implements the few parts of this
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* functionality which must be written in C++.
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*
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* We don't communicate with the JS code that lives in BrowserElementParent.js;
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* the JS and C++ parts are completely separate.
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*/
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class BrowserElementParent
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{
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public:
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/**
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* Handle a window.open call from an out-of-process <iframe mozbrowser>.
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*
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* window.open inside <iframe mozbrowser> doesn't actually open a new
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* top-level window. Instead, the "embedder" (the document which contains
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* the <iframe mozbrowser> whose content called window.open) gets the
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* opportunity to place a new <iframe mozbrowser> in the DOM somewhere. This
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* new "popup" iframe acts as the opened window.
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*
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* This method proceeds in three steps.
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*
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* 1) We fire a mozbrowseropenwindow CustomEvent on the opener
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* iframe element. This event's detail is an instance of
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* nsIOpenWindowEventDetail.
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*
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* 2) The embedder (the document which contains the opener iframe) can accept
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* the window.open request by inserting event.detail.frameElement (an iframe
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* element) into the DOM somewhere.
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*
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* 3) If the embedder accepted the window.open request, we return true and
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* set aPopupTabParent's frame element to event.detail.frameElement.
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* Otherwise, we return false.
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*
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* @param aURL the URL the new window should load. The empty string is
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* allowed.
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* @param aOpenerTabParent the TabParent whose TabChild called window.open.
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* @param aPopupTabParent the TabParent inside which the opened window will
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* live.
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* @return true on success, false otherwise. Failure is not (necessarily)
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* an error; it may indicate that the embedder simply rejected the
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* window.open request.
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*/
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static bool
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OpenWindowOOP(dom::TabParent* aOpenerTabParent,
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dom::TabParent* aPopupTabParent,
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const nsAString& aURL,
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const nsAString& aName,
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const nsAString& aFeatures);
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/**
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* Handle a window.open call from an in-process <iframe mozbrowser>.
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*
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* As with OpenWindowOOP, we return true if the window.open request
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* succeeded, and return false if the embedder denied the request.
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*
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* (These parameter types are silly, but they match what our caller has in
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* hand. Feel free to add an override, if they are inconvenient to you.)
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*
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* @param aURI the URI the new window should load. May be null.
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*/
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static bool
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OpenWindowInProcess(nsIDOMWindow* aOpenerWindow,
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nsIURI* aURI,
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const nsAString& aName,
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const nsACString& aFeatures,
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nsIDOMWindow** aReturnWindow);
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/**
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* Fire a mozbrowserasyncscroll CustomEvent on the given TabParent's frame element.
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* This event's detail is an instance of nsIAsyncScrollEventDetail.
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*
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* @param aContentRect: The portion of the page which is currently visible
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* onscreen in CSS pixels.
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*
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* @param aContentSize: The content width/height in CSS pixels.
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*
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* aContentRect.top + aContentRect.height may be larger than aContentSize.height.
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* This indicates that the content is over-scrolled, which occurs when the
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* page "rubber-bands" after being scrolled all the way to the bottom.
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* Similarly, aContentRect.left + aContentRect.width may be greater than
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* contentSize.width, and both left and top may be negative.
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*/
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static bool
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DispatchAsyncScrollEvent(dom::TabParent* aTabParent,
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const CSSRect& aContentRect,
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const CSSSize& aContentSize);
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};
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} // namespace mozilla
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#endif
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