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/* -*- 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
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