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- // Copyright 2022 The Chromium Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style license that can be
- // found in the LICENSE file.
- #ifndef ASH_AMBIENT_UI_AMBIENT_ANIMATION_ATTRIBUTION_TRANSFORMER_H_
- #define ASH_AMBIENT_UI_AMBIENT_ANIMATION_ATTRIBUTION_TRANSFORMER_H_
- #include "ash/ash_export.h"
- namespace views {
- class AnimatedImageView;
- } // namespace views
- namespace ash {
- // "Attribution" refers to the text credits that may optionally accompany each
- // photo that's assigned to a dynamic asset in an animation. The Lottie files
- // for ambient mode have a placeholder for each dynamic asset where its
- // attribution text should go.
- //
- // The attribution text box's coordinates must be baked into the Lottie file.
- // However, UX requires that it is positioned such that the bottom-right of the
- // text box has 24 pixels of padding from the bottom-right of the view.
- // Additionally, the text box's width should extend from the left side of the
- // view all the way to (width - 24) to account for long attributions.
- // Visually, it looks like this:
- //
- // View:
- // +-----------------------------------------------+
- // | |
- // | |
- // | |
- // | |
- // | |
- // | |
- // | |
- // | |
- // | |
- // |-------------------------------------------+ |
- // | Attribution Text| |
- // |-------------------------------------------+ |
- // | |
- // +-----------------------------------------------+
- //
- // The animation already right-aligns the text within the box, but since the
- // view's boundaries can vary from device to device, it is impossible to
- // specify text box coordinates in the lottie file that work for all devices.
- //
- // To accomplish this, AmbientAnimationAttributionTransformer uses Skottie's
- // text/transform property observer API to intercept and modify the text box's
- // coordinates.
- class ASH_EXPORT AmbientAnimationAttributionTransformer {
- public:
- // Modifies the lottie animation embedded within the |animated_image_view|
- // such that its attribution text box matches the UX requirements described
- // above.
- static void TransformTextBox(views::AnimatedImageView& animated_image_view);
- };
- } // namespace ash
- #endif // ASH_AMBIENT_UI_AMBIENT_ANIMATION_ATTRIBUTION_TRANSFORMER_H_
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