blob: d2c5b25b65d930fb5b2a2bf994bf328a5ec02baa [file] [log] [blame]
// Copyright 2019 The Cobalt Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "cobalt/cssom/cobalt_ui_nav_spotlight_transform_function.h"
#include "cobalt/cssom/transform_function_visitor.h"
namespace cobalt {
namespace cssom {
CobaltUiNavSpotlightTransformFunction::CobaltUiNavSpotlightTransformFunction(
float progress_to_identity)
: progress_to_identity_(progress_to_identity) {
traits_ = kTraitIsDynamic | kTraitUsesUiNavFocus;
}
void CobaltUiNavSpotlightTransformFunction::Accept(
TransformFunctionVisitor* visitor) const {
visitor->VisitCobaltUiNavSpotlightTransform(this);
}
std::string CobaltUiNavSpotlightTransformFunction::ToString() const {
return "-cobalt-ui-nav-spotlight-transform()";
}
math::Matrix3F CobaltUiNavSpotlightTransformFunction::ToMatrix(
const math::SizeF& used_size,
const scoped_refptr<ui_navigation::NavItem>& used_ui_nav_focus) const {
float scale = progress_to_identity_;
float focus_x = 0.0f, focus_y = 0.0f;
if ((used_ui_nav_focus &&
used_ui_nav_focus->GetFocusVector(&focus_x, &focus_y)) ||
(!used_ui_nav_focus &&
ui_navigation::NavItem::GetGlobalFocusVector(&focus_x, &focus_y))) {
// Translation must be mapped from [-1,+1] to [-50%,+50%].
focus_x *= (1.0f - progress_to_identity_) * 0.5f * used_size.width();
focus_y *= (1.0f - progress_to_identity_) * 0.5f * used_size.height();
scale = 1.0f;
}
return math::Matrix3F::FromValues(scale, 0.0f, focus_x, 0.0f, scale, focus_y,
0.0f, 0.0f, 1.0f);
}
} // namespace cssom
} // namespace cobalt