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// 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.
#ifndef ASH_KEYBOARD_UI_NOTIFICATION_MANAGER_H_
#define ASH_KEYBOARD_UI_NOTIFICATION_MANAGER_H_
#include "ash/keyboard/ui/keyboard_export.h"
#include "base/observer_list.h"
#include "ui/gfx/geometry/rect.h"
namespace ash {
class KeyboardControllerObserver;
}
namespace keyboard {
template <typename T>
class ValueNotificationConsolidator {
public:
explicit ValueNotificationConsolidator(const T& initial_value);
bool ShouldSendNotification(const T& new_value);
private:
T value_;
};
// Logic for consolidating consecutive identical notifications from the
// KeyboardControllerObserver.
class KEYBOARD_EXPORT NotificationManager {
public:
NotificationManager();
// Sends various KeyboardControllerObserver notifications related to bounds
// changes:
// - visual bounds change
// - occluded bounds change
// - layout displacement bounds change
// - general visibility change
void SendNotifications(
bool does_occluded_bounds_affect_layout,
const gfx::Rect& visual_bounds,
const gfx::Rect& occluded_bounds,
bool is_temporary,
const base::ObserverList<ash::KeyboardControllerObserver>::Unchecked&
observers);
bool ShouldSendVisibilityNotification(bool current_visibility);
bool ShouldSendVisualBoundsNotification(const gfx::Rect& new_bounds);
bool ShouldSendOccludedBoundsNotification(const gfx::Rect& new_bounds);
bool ShouldSendWorkspaceDisplacementBoundsNotification(
const gfx::Rect& new_bounds);
private:
// ValueNotificationConsolidator uses == for comparison, but empty rectangles
// ought to be considered equal regardless of location or non-zero dimensions.
// This method will return a default empty (0,0,0,0) rectangle for any 0-area
// rectangle, otherwise it returns the original rectangle, unmodified.
gfx::Rect CanonicalizeEmptyRectangles(const gfx::Rect& rect) const;
ValueNotificationConsolidator<bool> visibility_;
ValueNotificationConsolidator<gfx::Rect> visual_bounds_;
ValueNotificationConsolidator<gfx::Rect> occluded_bounds_;
ValueNotificationConsolidator<gfx::Rect> workspace_displaced_bounds_;
};
} // namespace keyboard
#endif // ASH_KEYBOARD_UI_NOTIFICATION_MANAGER_H_
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