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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
commit36d22d82aa202bb199967e9512281e9a53db42c9 (patch)
tree105e8c98ddea1c1e4784a60a5a6410fa416be2de /gfx/layers/apz/src/AutoDirWheelDeltaAdjuster.h
parentInitial commit. (diff)
downloadfirefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.tar.xz
firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.zip
Adding upstream version 115.7.0esr.upstream/115.7.0esr
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'gfx/layers/apz/src/AutoDirWheelDeltaAdjuster.h')
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+/* -*- 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__