зеркало из https://github.com/mozilla/gecko-dev.git
141 строка
2.8 KiB
C++
141 строка
2.8 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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#include "VisualViewport.h"
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#include "nsIScrollableFrame.h"
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#include "nsIDocShell.h"
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using namespace mozilla;
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using namespace mozilla::dom;
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VisualViewport::VisualViewport(nsPIDOMWindowInner* aWindow)
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: DOMEventTargetHelper(aWindow)
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{
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}
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VisualViewport::~VisualViewport()
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{
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}
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/* virtual */
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JSObject*
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VisualViewport::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
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{
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return VisualViewport_Binding::Wrap(aCx, this, aGivenProto);
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}
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CSSSize
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VisualViewport::VisualViewportSize() const
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{
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CSSSize size = CSSSize(0,0);
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nsIPresShell* presShell = GetPresShell();
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if (presShell) {
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if (presShell->IsVisualViewportSizeSet()) {
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size = CSSRect::FromAppUnits(
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presShell->GetVisualViewportSize());
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} else {
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nsIScrollableFrame* sf = presShell->GetRootScrollFrameAsScrollable();
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if (sf) {
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size = CSSRect::FromAppUnits(sf->GetScrollPortRect().Size());
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}
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}
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}
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return size;
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}
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double
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VisualViewport::Width() const
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{
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CSSSize size = VisualViewportSize();
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return size.width;
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}
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double
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VisualViewport::Height() const
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{
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CSSSize size = VisualViewportSize();
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return size.height;
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}
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double
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VisualViewport::Scale() const
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{
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double scale = 1;
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nsIPresShell* presShell = GetPresShell();
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if (presShell) {
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scale = presShell->GetResolution();
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}
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return scale;
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}
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CSSPoint
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VisualViewport::VisualViewportOffset() const
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{
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CSSPoint offset = CSSPoint(0,0);
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nsIPresShell* presShell = GetPresShell();
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if (presShell) {
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offset = CSSPoint::FromAppUnits(presShell->GetVisualViewportOffset());
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}
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return offset;
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}
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CSSPoint
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VisualViewport::LayoutViewportOffset() const
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{
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CSSPoint offset = CSSPoint(0,0);
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nsIPresShell* presShell = GetPresShell();
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if (presShell) {
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nsIScrollableFrame* sf = presShell->GetRootScrollFrameAsScrollable();
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if (sf) {
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offset = CSSPoint::FromAppUnits(sf->GetScrollPosition());
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}
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}
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return offset;
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}
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double
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VisualViewport::PageLeft() const
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{
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return VisualViewportOffset().X();
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}
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double
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VisualViewport::PageTop() const
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{
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return VisualViewportOffset().Y();
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}
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double
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VisualViewport::OffsetLeft() const
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{
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return PageLeft() - LayoutViewportOffset().X();
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}
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double
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VisualViewport::OffsetTop() const
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{
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return PageTop() - LayoutViewportOffset().Y();
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}
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nsIPresShell*
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VisualViewport::GetPresShell() const
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{
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nsCOMPtr<nsPIDOMWindowInner> window = GetOwner();
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if (!window) {
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return nullptr;
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}
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nsIDocShell* docShell = window->GetDocShell();
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if (!docShell) {
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return nullptr;
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}
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return docShell->GetPresShell();
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}
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