зеркало из https://github.com/mozilla/gecko-dev.git
63 строки
2.8 KiB
C++
63 строки
2.8 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* 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_widget_APZCCallbackHelper_h__
|
|
#define __mozilla_widget_APZCCallbackHelper_h__
|
|
|
|
#include "FrameMetrics.h"
|
|
#include "nsIContent.h"
|
|
#include "nsIDocument.h"
|
|
#include "nsIDOMWindowUtils.h"
|
|
|
|
namespace mozilla {
|
|
namespace widget {
|
|
|
|
/* This class contains some helper methods that facilitate implementing the
|
|
GeckoContentController callback interface required by the AsyncPanZoomController.
|
|
Since different platforms need to implement this interface in similar-but-
|
|
not-quite-the-same ways, this utility class provides some helpful methods
|
|
to hold code that can be shared across the different platform implementations.
|
|
*/
|
|
class APZCCallbackHelper
|
|
{
|
|
typedef mozilla::layers::FrameMetrics FrameMetrics;
|
|
|
|
public:
|
|
/* Checks to see if the pres shell that the given FrameMetrics object refers
|
|
to is still the valid pres shell for the DOMWindowUtils. This can help
|
|
guard against apply stale updates (updates meant for a pres shell that has
|
|
since been torn down and replaced). */
|
|
static bool HasValidPresShellId(nsIDOMWindowUtils* aUtils,
|
|
const FrameMetrics& aMetrics);
|
|
|
|
/* Applies the scroll and zoom parameters from the given FrameMetrics object to
|
|
the root frame corresponding to the given DOMWindowUtils. */
|
|
static void UpdateRootFrame(nsIDOMWindowUtils* aUtils,
|
|
const FrameMetrics& aMetrics);
|
|
|
|
/* Applies the scroll parameters from the given FrameMetrics object to the subframe
|
|
corresponding to the given content object. */
|
|
static void UpdateSubFrame(nsIContent* aContent,
|
|
const FrameMetrics& aMetrics);
|
|
|
|
/* Get the DOMWindowUtils for the window corresponding to the given document. */
|
|
static already_AddRefed<nsIDOMWindowUtils> GetDOMWindowUtils(const nsIDocument* aDoc);
|
|
|
|
/* Get the DOMWindowUtils for the window corresponding to the givent content
|
|
element. This might be an iframe inside the tab, for instance. */
|
|
static already_AddRefed<nsIDOMWindowUtils> GetDOMWindowUtils(const nsIContent* aContent);
|
|
|
|
/* Get the presShellId and view ID for the given content element, if they can be
|
|
found. Returns false if the values could not be found, true if they could. */
|
|
static bool GetScrollIdentifiers(const nsIContent* aContent,
|
|
uint32_t* aPresShellIdOut,
|
|
FrameMetrics::ViewID* aViewIdOut);
|
|
};
|
|
|
|
}
|
|
}
|
|
|
|
#endif /*__mozilla_widget_APZCCallbackHelper_h__ */
|