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bc95d9ddc6
This aligns display ports to tile boundaries, taking care to compensate for the difference between the requested scroll position and the actual scroll position.
67 lines
3.1 KiB
C++
67 lines
3.1 KiB
C++
/* -*- 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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#ifndef __mozilla_widget_APZCCallbackHelper_h__
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#define __mozilla_widget_APZCCallbackHelper_h__
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#include "FrameMetrics.h"
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#include "nsIContent.h"
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#include "nsIDocument.h"
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#include "nsIDOMWindowUtils.h"
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namespace mozilla {
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namespace widget {
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/* This class contains some helper methods that facilitate implementing the
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GeckoContentController callback interface required by the AsyncPanZoomController.
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Since different platforms need to implement this interface in similar-but-
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not-quite-the-same ways, this utility class provides some helpful methods
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to hold code that can be shared across the different platform implementations.
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*/
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class APZCCallbackHelper
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{
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typedef mozilla::layers::FrameMetrics FrameMetrics;
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public:
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/* Checks to see if the pres shell that the given FrameMetrics object refers
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to is still the valid pres shell for the DOMWindowUtils. This can help
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guard against apply stale updates (updates meant for a pres shell that has
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since been torn down and replaced). */
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static bool HasValidPresShellId(nsIDOMWindowUtils* aUtils,
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const FrameMetrics& aMetrics);
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/* Applies the scroll and zoom parameters from the given FrameMetrics object to
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the root frame corresponding to the given DOMWindowUtils. If tiled thebes
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layers are enabled, this will align the displayport to tile boundaries.
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Setting the scroll position can cause some small adjustments to be made
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to the actual scroll position. aMetrics' display port and scroll position
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will be updated with any modifications made. */
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static void UpdateRootFrame(nsIDOMWindowUtils* aUtils,
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FrameMetrics& aMetrics);
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/* Applies the scroll parameters from the given FrameMetrics object to the subframe
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corresponding to the given content object. */
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static void UpdateSubFrame(nsIContent* aContent,
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const FrameMetrics& aMetrics);
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/* Get the DOMWindowUtils for the window corresponding to the given document. */
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static already_AddRefed<nsIDOMWindowUtils> GetDOMWindowUtils(const nsIDocument* aDoc);
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/* Get the DOMWindowUtils for the window corresponding to the givent content
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element. This might be an iframe inside the tab, for instance. */
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static already_AddRefed<nsIDOMWindowUtils> GetDOMWindowUtils(const nsIContent* aContent);
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/* Get the presShellId and view ID for the given content element, if they can be
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found. Returns false if the values could not be found, true if they could. */
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static bool GetScrollIdentifiers(const nsIContent* aContent,
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uint32_t* aPresShellIdOut,
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FrameMetrics::ViewID* aViewIdOut);
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};
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}
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}
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#endif /*__mozilla_widget_APZCCallbackHelper_h__ */
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