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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
commit | 36d22d82aa202bb199967e9512281e9a53db42c9 (patch) | |
tree | 105e8c98ddea1c1e4784a60a5a6410fa416be2de /gfx/layers/apz/util/DoubleTapToZoom.h | |
parent | Initial commit. (diff) | |
download | firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.tar.xz firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.zip |
Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | gfx/layers/apz/util/DoubleTapToZoom.h | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/gfx/layers/apz/util/DoubleTapToZoom.h b/gfx/layers/apz/util/DoubleTapToZoom.h new file mode 100644 index 0000000000..91264deef9 --- /dev/null +++ b/gfx/layers/apz/util/DoubleTapToZoom.h @@ -0,0 +1,62 @@ +/* -*- 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_DoubleTapToZoom_h +#define mozilla_layers_DoubleTapToZoom_h + +#include "Units.h" + +template <class T> +class RefPtr; + +namespace mozilla { +namespace dom { +class Document; +} + +namespace layers { + +enum class CantZoomOutBehavior : int8_t { Nothing = 0, ZoomIn }; + +struct ZoomTarget { + // The preferred target rect that we'd like to zoom in on, if possible. An + // empty rect means the browser should zoom out. + CSSRect targetRect; + + // If we are asked to zoom out but cannot (due to zoom constraints, etc), then + // zoom in some small amount to provide feedback to the user. + CantZoomOutBehavior cantZoomOutBehavior = CantZoomOutBehavior::Nothing; + + // If zooming all the way in on |targetRect| is not possible (for example, due + // to a max zoom constraint), |elementBoundingRect| may be used to inform a + // more optimal target scroll position (for example, we may try to maximize + // the area of |elementBoundingRect| that's showing, while keeping + // |targetRect| in view and keeping the zoom as close to the desired zoom as + // possible). + Maybe<CSSRect> elementBoundingRect; + + // The document relative (ie if the content inside the root scroll frame + // existed without that scroll frame) pointer position at the time of the + // double tap or location of the double tap if we can compute it. Only used if + // the rest of this ZoomTarget is asking to zoom out but we are already at the + // minimum zoom. In which case we zoom in a small amount on this point. + Maybe<CSSPoint> documentRelativePointerPosition; +}; + +/** + * For a double tap at |aPoint|, return a ZoomTarget struct with contains a rect + * to which the browser should zoom in response (see ZoomTarget definition for + * more details). An empty rect means the browser should zoom out. |aDocument| + * should be the root content document for the content that was tapped. + */ +ZoomTarget CalculateRectToZoomTo( + const RefPtr<mozilla::dom::Document>& aRootContentDocument, + const CSSPoint& aPoint); + +} // namespace layers +} // namespace mozilla + +#endif /* mozilla_layers_DoubleTapToZoom_h */ |