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