| // Copyright 2017 The Chromium Authors |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "ash/accessibility/ui/accessibility_layer.h" |
| |
| #include "ui/aura/window.h" |
| #include "ui/compositor/layer.h" |
| #include "ui/compositor/paint_recorder.h" |
| #include "ui/gfx/canvas.h" |
| |
| namespace ui { |
| class Compositor; |
| } |
| |
| namespace ash { |
| |
| AccessibilityLayer::AccessibilityLayer(AccessibilityLayerDelegate* delegate) |
| : delegate_(delegate) { |
| DCHECK(delegate); |
| } |
| |
| AccessibilityLayer::~AccessibilityLayer() = default; |
| |
| void AccessibilityLayer::Set(aura::Window* root_window, |
| const gfx::Rect& bounds, |
| bool stack_at_top) { |
| DCHECK(root_window); |
| layer_rect_ = bounds; |
| gfx::Rect layer_bounds = bounds; |
| int inset = -(GetInset()); |
| layer_bounds.Inset(inset); |
| CreateOrUpdateLayer(root_window, "AccessibilityLayer", layer_bounds, |
| stack_at_top); |
| } |
| |
| void AccessibilityLayer::SetOpacity(float opacity) { |
| // Clamp to 0. It's possible for floating-point math to produce opacity |
| // slightly less than 0. |
| layer_->SetOpacity(std::max(0.f, opacity)); |
| } |
| |
| void AccessibilityLayer::SetSubpixelPositionOffset( |
| const gfx::Vector2dF& offset) { |
| layer_->SetSubpixelPositionOffset(offset); |
| } |
| |
| void AccessibilityLayer::CreateOrUpdateLayer(aura::Window* root_window, |
| const char* layer_name, |
| const gfx::Rect& bounds, |
| bool stack_at_top) { |
| if (!layer_ || root_window != root_window_) { |
| root_window_ = root_window; |
| ui::Layer* root_layer = root_window->layer(); |
| layer_ = std::make_unique<ui::Layer>(ui::LAYER_TEXTURED); |
| layer_->SetName(layer_name); |
| layer_->SetFillsBoundsOpaquely(false); |
| root_layer->Add(layer_.get()); |
| // Adding |layer_| to |root_layer| will trigger a DeviceScaleFactorChanged. |
| // AccessibilityFocusRingControllerImpl doesn't need to react to this |
| // initial DSF change, so set the delegate after Add(). |
| layer_->set_delegate(this); |
| } |
| |
| // Keep moving it to the top in case new layers have been added |
| // since we created this layer. |
| if (stack_at_top) { |
| layer_->parent()->StackAtTop(layer_.get()); |
| } else { |
| layer_->parent()->StackAtBottom(layer_.get()); |
| } |
| |
| layer_->SetBounds(bounds); |
| gfx::Rect layer_bounds(0, 0, bounds.width(), bounds.height()); |
| layer_->SchedulePaint(layer_bounds); |
| } |
| |
| void AccessibilityLayer::OnDeviceScaleFactorChanged( |
| float old_device_scale_factor, |
| float new_device_scale_factor) { |
| if (delegate_) |
| delegate_->OnDeviceScaleFactorChanged(); |
| } |
| |
| } // namespace ash |