gecko-dev/layout/base/MobileViewportManager.h

75 lines
2.5 KiB
C++

/* -*- 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 "nsIDocument.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();
/* 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();
/* 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;
};
#endif