зеркало из https://github.com/mozilla/gecko-dev.git
84 строки
2.8 KiB
C++
84 строки
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 "FrameMetrics.h"
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#include "gfxPrefs.h"
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#include "nsStyleConsts.h"
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namespace mozilla {
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namespace layers {
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const FrameMetrics::ViewID FrameMetrics::NULL_SCROLL_ID = 0;
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void
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FrameMetrics::RecalculateViewportOffset()
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{
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if (!mIsRootContent) {
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return;
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}
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CSSRect visualViewport = GetVisualViewport();
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// If the visual viewport is contained within the layout viewport, we don't
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// need to make any adjustments, so we can exit early.
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//
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// Additionally, if the composition bounds changes (due to an orientation
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// change, window resize, etc.), it may take a few frames for mViewport to
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// update and during that time, the visual viewport may be larger than the
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// layout viewport, so don't attempt to make any adjustments.
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if (mViewport.Contains(visualViewport) ||
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(mViewport.Width() < visualViewport.Width() &&
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!FuzzyEqualsMultiplicative(mViewport.Width(), visualViewport.Width())) ||
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(mViewport.Height() < visualViewport.Height() &&
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!FuzzyEqualsMultiplicative(mViewport.Height(), visualViewport.Height()))) {
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return;
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}
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if (visualViewport.X() < mViewport.X()) {
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mViewport.MoveToX(visualViewport.X());
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} else if (mViewport.XMost() < visualViewport.XMost()) {
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mViewport.MoveByX(visualViewport.XMost() - mViewport.XMost());
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}
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if (visualViewport.Y() < mViewport.Y()) {
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mViewport.MoveToY(visualViewport.Y());
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} else if (mViewport.YMost() < visualViewport.YMost()) {
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mViewport.MoveByY(visualViewport.YMost() - mViewport.YMost());
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}
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}
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void
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ScrollMetadata::SetUsesContainerScrolling(bool aValue) {
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MOZ_ASSERT_IF(aValue, gfxPrefs::LayoutUseContainersForRootFrames());
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mUsesContainerScrolling = aValue;
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}
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static OverscrollBehavior
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ToOverscrollBehavior(StyleOverscrollBehavior aBehavior)
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{
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switch (aBehavior) {
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case StyleOverscrollBehavior::Auto:
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return OverscrollBehavior::Auto;
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case StyleOverscrollBehavior::Contain:
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return OverscrollBehavior::Contain;
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case StyleOverscrollBehavior::None:
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return OverscrollBehavior::None;
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}
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MOZ_ASSERT_UNREACHABLE("Invalid overscroll behavior");
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return OverscrollBehavior::Auto;
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}
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OverscrollBehaviorInfo
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OverscrollBehaviorInfo::FromStyleConstants(StyleOverscrollBehavior aBehaviorX,
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StyleOverscrollBehavior aBehaviorY)
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{
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OverscrollBehaviorInfo result;
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result.mBehaviorX = ToOverscrollBehavior(aBehaviorX);
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result.mBehaviorY = ToOverscrollBehavior(aBehaviorY);
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return result;
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}
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StaticAutoPtr<const ScrollMetadata> ScrollMetadata::sNullMetadata;
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}
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}
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