зеркало из https://github.com/mozilla/gecko-dev.git
145 строки
4.2 KiB
C++
145 строки
4.2 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
|
|
/* 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 mozilla_dom_ResizeObserverController_h
|
|
#define mozilla_dom_ResizeObserverController_h
|
|
|
|
#include "mozilla/dom/Document.h"
|
|
#include "mozilla/dom/ResizeObserver.h"
|
|
#include "mozilla/TimeStamp.h"
|
|
#include "nsRefreshObservers.h"
|
|
#include "nsTObserverArray.h"
|
|
|
|
class nsRefreshDriver;
|
|
|
|
namespace mozilla {
|
|
|
|
class PresShell;
|
|
|
|
namespace dom {
|
|
|
|
class ResizeObserverController;
|
|
|
|
/**
|
|
* ResizeObserverNotificationHelper will trigger ResizeObserver notifications
|
|
* by registering with the Refresh Driver.
|
|
*/
|
|
class ResizeObserverNotificationHelper final : public nsARefreshObserver {
|
|
public:
|
|
NS_INLINE_DECL_REFCOUNTING(ResizeObserverNotificationHelper, override)
|
|
|
|
explicit ResizeObserverNotificationHelper(ResizeObserverController* aOwner)
|
|
: mOwner(aOwner), mRegistered(false) {
|
|
MOZ_ASSERT(mOwner, "Need a non-null owner");
|
|
}
|
|
|
|
MOZ_CAN_RUN_SCRIPT void WillRefresh(TimeStamp aTime) override;
|
|
|
|
nsRefreshDriver* GetRefreshDriver() const;
|
|
|
|
void Register();
|
|
|
|
void Unregister();
|
|
|
|
bool IsRegistered() const { return mRegistered; }
|
|
|
|
void DetachFromOwner() { mOwner = nullptr; }
|
|
|
|
private:
|
|
virtual ~ResizeObserverNotificationHelper();
|
|
|
|
ResizeObserverController* mOwner;
|
|
bool mRegistered;
|
|
};
|
|
|
|
/**
|
|
* ResizeObserverController contains the list of ResizeObservers and controls
|
|
* the flow of notification.
|
|
*/
|
|
class ResizeObserverController final {
|
|
public:
|
|
explicit ResizeObserverController(Document* aDocument)
|
|
: mDocument(aDocument),
|
|
mResizeObserverNotificationHelper(
|
|
new ResizeObserverNotificationHelper(this)) {
|
|
MOZ_ASSERT(mDocument, "Need a non-null document");
|
|
}
|
|
|
|
void AddSizeOfIncludingThis(nsWindowSizes&) const;
|
|
|
|
void ShellDetachedFromDocument();
|
|
void AddResizeObserver(ResizeObserver& aObserver) {
|
|
MOZ_ASSERT(!mResizeObservers.Contains(&aObserver));
|
|
// Insert internal ResizeObservers before scripted ones, since they may have
|
|
// observable side-effects and we don't want to expose the insertion time.
|
|
if (aObserver.HasNativeCallback()) {
|
|
mResizeObservers.InsertElementAt(0, &aObserver);
|
|
} else {
|
|
mResizeObservers.AppendElement(&aObserver);
|
|
}
|
|
}
|
|
|
|
void RemoveResizeObserver(ResizeObserver& aObserver) {
|
|
MOZ_ASSERT(mResizeObservers.Contains(&aObserver));
|
|
mResizeObservers.RemoveElement(&aObserver);
|
|
}
|
|
|
|
/**
|
|
* Schedule the notification via ResizeObserverNotificationHelper refresh
|
|
* observer.
|
|
*/
|
|
void ScheduleNotification();
|
|
|
|
/**
|
|
* Notify all ResizeObservers by gathering and broadcasting all active
|
|
* observations.
|
|
*/
|
|
MOZ_CAN_RUN_SCRIPT void Notify();
|
|
|
|
PresShell* GetPresShell() const { return mDocument->GetPresShell(); }
|
|
|
|
~ResizeObserverController();
|
|
|
|
private:
|
|
/**
|
|
* Calls GatherActiveObservations(aDepth) for all ResizeObservers in this
|
|
* controller. All observations in each ResizeObserver with element's depth
|
|
* more than aDepth will be gathered.
|
|
*/
|
|
void GatherAllActiveObservations(uint32_t aDepth);
|
|
|
|
/**
|
|
* Calls BroadcastActiveObservations() for all ResizeObservers in this
|
|
* controller. It also returns the shallowest depth of observed target
|
|
* elements with active observations from all ResizeObservers or
|
|
* numeric_limits<uint32_t>::max() if there aren't any active observations
|
|
* at all.
|
|
*/
|
|
MOZ_CAN_RUN_SCRIPT uint32_t BroadcastAllActiveObservations();
|
|
|
|
/**
|
|
* Returns whether there is any ResizeObserver that has active observations.
|
|
*/
|
|
bool HasAnyActiveObservations() const;
|
|
|
|
/**
|
|
* Returns whether there is any ResizeObserver that has skipped observations.
|
|
*/
|
|
bool HasAnySkippedObservations() const;
|
|
|
|
// Raw pointer is OK because mDocument strongly owns us & hence must outlive
|
|
// us.
|
|
Document* const mDocument;
|
|
|
|
RefPtr<ResizeObserverNotificationHelper> mResizeObserverNotificationHelper;
|
|
nsTArray<ResizeObserver*> mResizeObservers;
|
|
};
|
|
|
|
} // namespace dom
|
|
} // namespace mozilla
|
|
|
|
#endif // mozilla_dom_ResizeObserverController_h
|