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When going back/forward through a tab's session history, the saved resolution from the LayoutHistoryState is set on the PresShell before first paint. On Fennec, this means that it is subsequently going to be overwritten by the MobileViewportManager's default zoom calculation. To fix this, we make use of the MVM's feature to set a "restored" resolution that will then be taken into account on first paint. MozReview-Commit-ID: 43o97M6fiaZ --HG-- extra : rebase_source : 0dda351784f3f5e3d88ec3e176b73974e96b71b7
102 lines
3.9 KiB
C++
102 lines
3.9 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 MobileViewportManager_h_
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#define MobileViewportManager_h_
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#include "mozilla/Maybe.h"
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#include "nsIDOMEventListener.h"
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#include "nsIObserver.h"
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#include "Units.h"
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class nsIDOMEventTarget;
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class nsIDocument;
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class nsIPresShell;
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class nsViewportInfo;
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class MobileViewportManager final : public nsIDOMEventListener
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, public nsIObserver
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{
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public:
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NS_DECL_ISUPPORTS
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NS_DECL_NSIDOMEVENTLISTENER
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NS_DECL_NSIOBSERVER
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MobileViewportManager(nsIPresShell* aPresShell,
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nsIDocument* aDocument);
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void Destroy();
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/* Provide a resolution to use during the first paint instead of the default
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* resolution computed from the viewport info metadata. This is in the same
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* "units" as the argument to nsDOMWindowUtils::SetResolutionAndScaleTo.
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* Also takes the previous display dimensions as they were at the time the
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* resolution was stored in order to correctly adjust the resolution if the
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* device was rotated in the meantime. */
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void SetRestoreResolution(float aResolution,
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mozilla::LayoutDeviceIntSize aDisplaySize);
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private:
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void SetRestoreResolution(float aResolution);
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public:
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/* Notify the MobileViewportManager that a reflow was requested in the
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* presShell.*/
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void RequestReflow();
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/* Notify the MobileViewportManager that the resolution on the presShell was
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* updated, and the SPCSPS needs to be updated. */
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void ResolutionUpdated();
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private:
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~MobileViewportManager();
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/* Called to compute the initial viewport on page load or before-first-paint,
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* whichever happens first. */
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void SetInitialViewport();
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/* Main helper method to update the CSS viewport and any other properties that
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* need updating. */
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void RefreshViewportSize(bool aForceAdjustResolution);
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/* Secondary main helper method to update just the SPCSPS. */
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void RefreshSPCSPS();
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/* Helper to clamp the given zoom by the min/max in the viewport info. */
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mozilla::CSSToScreenScale ClampZoom(const mozilla::CSSToScreenScale& aZoom,
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const nsViewportInfo& aViewportInfo);
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/* Helper to update the given resolution according to changed display and viewport widths. */
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mozilla::LayoutDeviceToLayerScale
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ScaleResolutionWithDisplayWidth(const mozilla::LayoutDeviceToLayerScale& aRes,
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const float& aDisplayWidthChangeRatio,
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const mozilla::CSSSize& aNewViewport,
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const mozilla::CSSSize& aOldViewport);
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/* Updates the presShell resolution and returns the new zoom. */
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mozilla::CSSToScreenScale UpdateResolution(const nsViewportInfo& aViewportInfo,
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const mozilla::ScreenIntSize& aDisplaySize,
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const mozilla::CSSSize& aViewport,
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const mozilla::Maybe<float>& aDisplayWidthChangeRatio);
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/* Updates the scroll-position-clamping scrollport size */
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void UpdateSPCSPS(const mozilla::ScreenIntSize& aDisplaySize,
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const mozilla::CSSToScreenScale& aZoom);
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/* Updates the displayport margins for the presShell's root scrollable frame */
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void UpdateDisplayPortMargins();
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nsCOMPtr<nsIDocument> mDocument;
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nsIPresShell* MOZ_NON_OWNING_REF mPresShell; // raw ref since the presShell owns this
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nsCOMPtr<nsIDOMEventTarget> mEventTarget;
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bool mIsFirstPaint;
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bool mPainted;
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mozilla::LayoutDeviceIntSize mDisplaySize;
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mozilla::CSSSize mMobileViewportSize;
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mozilla::Maybe<float> mRestoreResolution;
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mozilla::Maybe<mozilla::ScreenIntSize> mRestoreDisplaySize;
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};
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#endif
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