forked from mirrors/gecko-dev
110 lines
3.8 KiB
C++
110 lines
3.8 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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 mozilla_dom_VisualViewport_h
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#define mozilla_dom_VisualViewport_h
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#include "mozilla/DOMEventTargetHelper.h"
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#include "mozilla/WeakPtr.h"
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#include "mozilla/dom/VisualViewportBinding.h"
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#include "Units.h"
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class nsPresContext;
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namespace mozilla {
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class PresShell;
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namespace dom {
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/* Visual Viewport API spec:
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* https://wicg.github.io/visual-viewport/#the-visualviewport-interface */
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class VisualViewport final : public mozilla::DOMEventTargetHelper {
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public:
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explicit VisualViewport(nsPIDOMWindowInner* aWindow);
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double OffsetLeft() const;
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double OffsetTop() const;
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double PageLeft() const;
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double PageTop() const;
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MOZ_CAN_RUN_SCRIPT double Width() const;
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MOZ_CAN_RUN_SCRIPT double Height() const;
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double Scale() const;
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IMPL_EVENT_HANDLER(resize)
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IMPL_EVENT_HANDLER(scroll)
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virtual JSObject* WrapObject(JSContext* aCx,
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JS::Handle<JSObject*> aGivenProto) override;
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void GetEventTargetParent(EventChainPreVisitor& aVisitor) override;
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void PostResizeEvent();
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void PostScrollEvent(const nsPoint& aPrevVisualOffset,
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const nsPoint& aPrevLayoutOffset);
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// These two events are modelled after the ScrollEvent class in
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// nsGfxScrollFrame.h.
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class VisualViewportResizeEvent : public Runnable {
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public:
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NS_DECL_NSIRUNNABLE
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VisualViewportResizeEvent(VisualViewport* aViewport,
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nsPresContext* aPresContext);
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bool HasPresContext(nsPresContext* aContext) const;
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void Revoke();
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private:
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VisualViewport* mViewport;
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WeakPtr<nsPresContext> mPresContext;
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};
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class VisualViewportScrollEvent : public Runnable {
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public:
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NS_DECL_NSIRUNNABLE
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VisualViewportScrollEvent(VisualViewport* aViewport,
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nsPresContext* aPresContext,
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const nsPoint& aPrevVisualOffset,
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const nsPoint& aPrevLayoutOffset);
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bool HasPresContext(nsPresContext* aContext) const;
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void Revoke();
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nsPoint PrevVisualOffset() const { return mPrevVisualOffset; }
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nsPoint PrevLayoutOffset() const { return mPrevLayoutOffset; }
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private:
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VisualViewport* mViewport;
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WeakPtr<nsPresContext> mPresContext;
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// The VisualViewport "scroll" event is supposed to be fired only when the
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// *relative* offset between visual and layout viewport changes. The two
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// viewports are updated independently from each other, though, so the only
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// thing we can do is note the fact that one of the inputs into the relative
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// visual viewport offset changed and then check the offset again at the
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// next refresh driver tick, just before the event is going to fire.
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// Hopefully, at this point both visual and layout viewport positions have
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// been updated, so that we're able to tell whether the relative offset did
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// in fact change or not.
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const nsPoint mPrevVisualOffset;
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const nsPoint mPrevLayoutOffset;
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};
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private:
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virtual ~VisualViewport();
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MOZ_CAN_RUN_SCRIPT CSSSize VisualViewportSize() const;
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CSSPoint VisualViewportOffset() const;
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CSSPoint LayoutViewportOffset() const;
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Document* GetDocument() const;
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PresShell* GetPresShell() const;
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nsPresContext* GetPresContext() const;
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MOZ_CAN_RUN_SCRIPT void FireResizeEvent();
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MOZ_CAN_RUN_SCRIPT void FireScrollEvent();
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RefPtr<VisualViewportResizeEvent> mResizeEvent;
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RefPtr<VisualViewportScrollEvent> mScrollEvent;
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};
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} // namespace dom
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} // namespace mozilla
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#endif // mozilla_dom_VisualViewport_h
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