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chromium / chromium / src / refs/tags/123.0.6312.41 / . / ash / accessibility / ui / accessibility_layer.cc
blob: bed9e3872ae7bbec01648a4f3213ea4dc86d7e4b [file] [log] [blame]
Avi Drissman3a215d1e2022-09-07 19:43:09[diff] [blame]1// Copyright 2017 The Chromium Authors
Katie Dektarc0ad2ff2017-11-08 04:42:08[diff] [blame]2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
David Tsengb774097e2021-03-24 17:31:10[diff] [blame]5#include "ash/accessibility/ui/accessibility_layer.h"
Katie Dektarc0ad2ff2017-11-08 04:42:08[diff] [blame]6
7#include "ui/aura/window.h"
Katie Dektarc0ad2ff2017-11-08 04:42:08[diff] [blame]8#include "ui/compositor/layer.h"
9#include "ui/compositor/paint_recorder.h"
Katie Dektarc0ad2ff2017-11-08 04:42:08[diff] [blame]10#include "ui/gfx/canvas.h"
11
12namespace ui {
13class Compositor;
14}
15
16namespace ash {
17
18AccessibilityLayer::AccessibilityLayer(AccessibilityLayerDelegate* delegate)
19 : delegate_(delegate) {
20 DCHECK(delegate);
21}
22
David Tseng63e73872021-06-29 20:24:51[diff] [blame]23AccessibilityLayer::~AccessibilityLayer() = default;
Katie Dektarc0ad2ff2017-11-08 04:42:08[diff] [blame]24
25void AccessibilityLayer::Set(aura::Window* root_window,
Joel Riley0790b7222020-12-14 20:42:02[diff] [blame]26 const gfx::Rect& bounds,
27 bool stack_at_top) {
Katie Dektarc0ad2ff2017-11-08 04:42:08[diff] [blame]28 DCHECK(root_window);
29 layer_rect_ = bounds;
30 gfx::Rect layer_bounds = bounds;
31 int inset = -(GetInset());
Xianzhu Wang549ddc42022-04-04 17:05:55[diff] [blame]32 layer_bounds.Inset(inset);
Joel Riley0790b7222020-12-14 20:42:02[diff] [blame]33 CreateOrUpdateLayer(root_window, "AccessibilityLayer", layer_bounds,
34 stack_at_top);
Katie Dektarc0ad2ff2017-11-08 04:42:08[diff] [blame]35}
36
37void AccessibilityLayer::SetOpacity(float opacity) {
Katie D6af68c5e2018-02-14 23:21:16[diff] [blame]38 // Clamp to 0. It's possible for floating-point math to produce opacity
39 // slightly less than 0.
40 layer_->SetOpacity(std::max(0.f, opacity));
Katie Dektarc0ad2ff2017-11-08 04:42:08[diff] [blame]41}
42
Shannon Chen9e0cdf7e2020-10-29 02:48:48[diff] [blame]43void AccessibilityLayer::SetSubpixelPositionOffset(
44 const gfx::Vector2dF& offset) {
45 layer_->SetSubpixelPositionOffset(offset);
46}
47
Katie Dektarc0ad2ff2017-11-08 04:42:08[diff] [blame]48void AccessibilityLayer::CreateOrUpdateLayer(aura::Window* root_window,
49 const char* layer_name,
Joel Riley0790b7222020-12-14 20:42:02[diff] [blame]50 const gfx::Rect& bounds,
51 bool stack_at_top) {
Katie Dektarc0ad2ff2017-11-08 04:42:08[diff] [blame]52 if (!layer_ || root_window != root_window_) {
53 root_window_ = root_window;
54 ui::Layer* root_layer = root_window->layer();
55 layer_ = std::make_unique<ui::Layer>(ui::LAYER_TEXTURED);
yjliu0b2876212019-12-19 03:36:20[diff] [blame]56 layer_->SetName(layer_name);
Katie Dektarc0ad2ff2017-11-08 04:42:08[diff] [blame]57 layer_->SetFillsBoundsOpaquely(false);
58 root_layer->Add(layer_.get());
Evan Stadebb4f27782019-07-10 23:42:15[diff] [blame]59 // Adding |layer_| to |root_layer| will trigger a DeviceScaleFactorChanged.
60 // AccessibilityFocusRingControllerImpl doesn't need to react to this
61 // initial DSF change, so set the delegate after Add().
62 layer_->set_delegate(this);
Katie Dektarc0ad2ff2017-11-08 04:42:08[diff] [blame]63 }
64
65 // Keep moving it to the top in case new layers have been added
66 // since we created this layer.
Joel Riley0790b7222020-12-14 20:42:02[diff] [blame]67 if (stack_at_top) {
68 layer_->parent()->StackAtTop(layer_.get());
69 } else {
70 layer_->parent()->StackAtBottom(layer_.get());
71 }
Katie Dektarc0ad2ff2017-11-08 04:42:08[diff] [blame]72
73 layer_->SetBounds(bounds);
74 gfx::Rect layer_bounds(0, 0, bounds.width(), bounds.height());
75 layer_->SchedulePaint(layer_bounds);
Katie Dektarc0ad2ff2017-11-08 04:42:08[diff] [blame]76}
77
Katie Dektarc0ad2ff2017-11-08 04:42:08[diff] [blame]78void AccessibilityLayer::OnDeviceScaleFactorChanged(
79 float old_device_scale_factor,
80 float new_device_scale_factor) {
81 if (delegate_)
82 delegate_->OnDeviceScaleFactorChanged();
83}
84
Katie Dektarc0ad2ff2017-11-08 04:42:08[diff] [blame]85} // namespace ash