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// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_KEYBOARD_NOTIFICATION_MANAGER_H_
#define UI_KEYBOARD_NOTIFICATION_MANAGER_H_
#include "base/observer_list.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/keyboard/keyboard_export.h"
namespace keyboard {
class KeyboardControllerObserver;
template <typename T>
class ValueNotificationConsolidator {
public:
ValueNotificationConsolidator() {}
bool ShouldSendNotification(const T new_value);
private:
bool never_sent_ = true;
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 availability change
void SendNotifications(
bool bounds_obscure_usable_region,
bool bounds_affect_layout,
bool is_locked,
const gfx::Rect& bounds,
const base::ObserverList<KeyboardControllerObserver>& observers);
bool ShouldSendAvailabilityNotification(bool current_availability);
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.
const gfx::Rect CanonicalizeEmptyRectangles(const gfx::Rect rect) const;
ValueNotificationConsolidator<bool> availability_;
ValueNotificationConsolidator<gfx::Rect> visual_bounds_;
ValueNotificationConsolidator<gfx::Rect> occluded_bounds_;
ValueNotificationConsolidator<gfx::Rect> workspace_displaced_bounds_;
};
} // namespace keyboard
#endif // UI_KEYBOARD_NOTIFICATION_MANAGER_H_
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