From 36d22d82aa202bb199967e9512281e9a53db42c9 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 21:33:14 +0200 Subject: Adding upstream version 115.7.0esr. Signed-off-by: Daniel Baumann --- gfx/layers/apz/src/AutoDirWheelDeltaAdjuster.h | 89 ++++++++++++++++++++++++++ 1 file changed, 89 insertions(+) create mode 100644 gfx/layers/apz/src/AutoDirWheelDeltaAdjuster.h (limited to 'gfx/layers/apz/src/AutoDirWheelDeltaAdjuster.h') diff --git a/gfx/layers/apz/src/AutoDirWheelDeltaAdjuster.h b/gfx/layers/apz/src/AutoDirWheelDeltaAdjuster.h new file mode 100644 index 0000000000..187641514a --- /dev/null +++ b/gfx/layers/apz/src/AutoDirWheelDeltaAdjuster.h @@ -0,0 +1,89 @@ +/* -*- 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_layers_AutoDirWheelDeltaAdjuster_h__ +#define __mozilla_layers_AutoDirWheelDeltaAdjuster_h__ + +#include "Axis.h" // for AxisX, AxisY, Side +#include "mozilla/WheelHandlingHelper.h" // for AutoDirWheelDeltaAdjuster + +namespace mozilla { +namespace layers { + +/** + * About AutoDirWheelDeltaAdjuster: + * For an AutoDir wheel scroll, there's some situations where we should adjust a + * wheel event's delta values. AutoDirWheelDeltaAdjuster converts delta values + * for AutoDir scrolling. An AutoDir wheel scroll lets the user scroll a frame + * with only one scrollbar, using either a vertical or a horzizontal wheel. + * For more detail about the concept of AutoDir scrolling, see the comments in + * AutoDirWheelDeltaAdjuster. + * + * This is the APZ implementation of AutoDirWheelDeltaAdjuster. + */ +class MOZ_STACK_CLASS APZAutoDirWheelDeltaAdjuster final + : public AutoDirWheelDeltaAdjuster { + public: + /** + * @param aDeltaX DeltaX for a wheel event whose delta values will + * be adjusted upon calling adjust() when + * ShouldBeAdjusted() returns true. + * @param aDeltaY DeltaY for a wheel event, like DeltaX. + * @param aAxisX The X axis information provider for the current + * frame, such as whether the frame can be scrolled + * horizontally, leftwards or rightwards. + * @param aAxisY The Y axis information provider for the current + * frame, such as whether the frame can be scrolled + * vertically, upwards or downwards. + * @param aIsHorizontalContentRightToLeft + * Indicates whether the horizontal content starts + * at rightside. This value will decide which edge + * the adjusted scroll goes towards, in other words, + * it will decide the sign of the adjusted delta + * values). For detailed information, see + * IsHorizontalContentRightToLeft() in + * the base class AutoDirWheelDeltaAdjuster. + */ + APZAutoDirWheelDeltaAdjuster(double& aDeltaX, double& aDeltaY, + const AxisX& aAxisX, const AxisY& aAxisY, + bool aIsHorizontalContentRightToLeft) + : AutoDirWheelDeltaAdjuster(aDeltaX, aDeltaY), + mAxisX(aAxisX), + mAxisY(aAxisY), + mIsHorizontalContentRightToLeft(aIsHorizontalContentRightToLeft) {} + + private: + virtual bool CanScrollAlongXAxis() const override { + return mAxisX.CanScroll(); + } + virtual bool CanScrollAlongYAxis() const override { + return mAxisY.CanScroll(); + } + virtual bool CanScrollUpwards() const override { + return mAxisY.CanScrollTo(eSideTop); + } + virtual bool CanScrollDownwards() const override { + return mAxisY.CanScrollTo(eSideBottom); + } + virtual bool CanScrollLeftwards() const override { + return mAxisX.CanScrollTo(eSideLeft); + } + virtual bool CanScrollRightwards() const override { + return mAxisX.CanScrollTo(eSideRight); + } + virtual bool IsHorizontalContentRightToLeft() const override { + return mIsHorizontalContentRightToLeft; + } + + const AxisX& mAxisX; + const AxisY& mAxisY; + bool mIsHorizontalContentRightToLeft; +}; + +} // namespace layers +} // namespace mozilla + +#endif // __mozilla_layers_AutoDirWheelDeltaAdjuster_h__ -- cgit v1.2.3