101 lines
3.9 KiB
C++
101 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 "nsIDocument.h"
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#include "nsIDOMEventListener.h"
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#include "nsIDOMEventTarget.h"
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#include "nsIObserver.h"
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#include "nsViewportInfo.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 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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/* 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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