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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef ASH_ACCESSIBILITY_UI_ACCESSIBILITY_PANEL_LAYOUT_MANAGER_H_
#define ASH_ACCESSIBILITY_UI_ACCESSIBILITY_PANEL_LAYOUT_MANAGER_H_
#include "ash/ash_export.h"
#include "ash/public/cpp/accessibility_controller_enums.h"
#include "ash/shell_observer.h"
#include "base/memory/raw_ptr.h"
#include "ui/aura/layout_manager.h"
#include "ui/display/display_observer.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/wm/public/activation_change_observer.h"
namespace aura {
class Window;
}
namespace ash {
// AccessibilityPanelLayoutManager manages the container window used for the
// ChromeVox spoken feedback panel, which sits at the top of the display. It
// insets the display work area bounds when ChromeVox is visible. The ChromeVox
// panel is created by Chrome because spoken feedback is implemented by an
// extension. Exported for test.
class ASH_EXPORT AccessibilityPanelLayoutManager
: public aura::LayoutManager,
public display::DisplayObserver,
public ::wm::ActivationChangeObserver,
public ShellObserver {
public:
// Height of the panel in DIPs. Public for test.
static constexpr int kDefaultPanelHeight = 35;
AccessibilityPanelLayoutManager();
AccessibilityPanelLayoutManager(const AccessibilityPanelLayoutManager&) =
delete;
AccessibilityPanelLayoutManager& operator=(
const AccessibilityPanelLayoutManager&) = delete;
~AccessibilityPanelLayoutManager() override;
// Controls the panel's visibility and location.
void SetAlwaysVisible(bool always_visible);
void SetPanelBounds(const gfx::Rect& bounds, AccessibilityPanelState state);
// aura::LayoutManager:
void OnWindowResized() override {}
void OnWindowAddedToLayout(aura::Window* child) override;
void OnWillRemoveWindowFromLayout(aura::Window* child) override {}
void OnWindowRemovedFromLayout(aura::Window* child) override;
void OnChildWindowVisibilityChanged(aura::Window* child,
bool visible) override;
void SetChildBounds(aura::Window* child,
const gfx::Rect& requested_bounds) override;
// DisplayObserver:
void OnDisplayAdded(const display::Display& new_display) override {}
void OnDisplaysRemoved(const display::Displays& removed_displays) override {}
void OnDisplayMetricsChanged(const display::Display& display,
uint32_t changed_metrics) override;
// ::wm::ActivationChangeObserver:
void OnWindowActivated(ActivationReason reason,
aura::Window* gained_active,
aura::Window* lost_active) override;
// ShellObserver:
void OnFullscreenStateChanged(bool is_fullscreen,
aura::Window* container) override;
aura::Window* panel_window_for_test() { return panel_window_; }
private:
// Updates the panel window bounds.
void UpdateWindowBounds();
// Sets cached height of the accessibility panel.
void UpdateWorkAreaForPanelHeight();
// The panel being managed (e.g. the ChromeVoxPanel's native aura window).
raw_ptr<aura::Window> panel_window_ = nullptr;
// Window bounds when not in fullscreen
gfx::Rect panel_bounds_ = gfx::Rect(0, 0, 0, 0);
display::ScopedDisplayObserver display_observer_{this};
// Determines whether panel is hidden when browser is in fullscreen.
bool always_visible_ = false;
// Determines how the panel_bounds_ are used when displaying the panel.
AccessibilityPanelState panel_state_ = AccessibilityPanelState::BOUNDED;
};
} // namespace ash
#endif // ASH_ACCESSIBILITY_UI_ACCESSIBILITY_PANEL_LAYOUT_MANAGER_H_
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