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// Copyright (c) 2013 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.
#include <memory>
#include "base/event_types.h"
#include "base/macros.h"
#include "base/observer_list.h"
#include "ui/aura/window_observer.h"
#include "ui/base/ime/input_method_observer.h"
#include "ui/base/ime/text_input_type.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/keyboard/keyboard_export.h"
namespace aura {
class Window;
namespace ui {
class InputMethod;
class TextInputClient;
namespace keyboard {
class CallbackAnimationObserver;
class KeyboardControllerObserver;
class KeyboardUI;
// Animation distance.
const int kAnimationDistance = 30;
enum KeyboardMode {
// Invalid mode.
// Full width virtual keyboard. The virtual keyboard window has the same width
// as the display.
// Floating virtual keyboard. The virtual keyboard window has customizable
// width and is draggable.
// Provides control of the virtual keyboard, including providing a container
// and controlling visibility.
class KEYBOARD_EXPORT KeyboardController : public ui::InputMethodObserver,
public aura::WindowObserver {
// Different ways to hide the keyboard.
enum HideReason {
// System initiated.
// User initiated.
// Takes ownership of |ui|.
explicit KeyboardController(KeyboardUI* ui);
~KeyboardController() override;
// Returns the container for the keyboard, which is owned by
// KeyboardController.
aura::Window* GetContainerWindow();
// Whether the container window for the keyboard has been initialized.
bool keyboard_container_initialized() const { return container_ != nullptr; }
// Reloads the content of the keyboard. No-op if the keyboard content is not
// loaded yet.
void Reload();
// Hides virtual keyboard and notifies observer bounds change.
// This function should be called with a delay to avoid layout flicker
// when the focus of input field quickly change. |automatic| is true when the
// call is made by the system rather than initiated by the user.
void HideKeyboard(HideReason reason);
// Notifies the keyboard observer for keyboard bounds changed.
void NotifyKeyboardBoundsChanging(const gfx::Rect& new_bounds);
// Management of the observer list.
virtual void AddObserver(KeyboardControllerObserver* observer);
virtual void RemoveObserver(KeyboardControllerObserver* observer);
KeyboardUI* ui() { return ui_.get(); }
void set_lock_keyboard(bool lock) { lock_keyboard_ = lock; }
bool get_lock_keyboard() const { return lock_keyboard_; }
KeyboardMode keyboard_mode() const { return keyboard_mode_; }
void SetKeyboardMode(KeyboardMode mode);
// Force the keyboard to show up if not showing and lock the keyboard if
// |lock| is true.
void ShowKeyboard(bool lock);
// Sets the active keyboard controller. KeyboardController takes ownership of
// the instance. Calling ResetIntance with a new instance destroys the
// previous one. May be called with NULL to clear the instance.
static void ResetInstance(KeyboardController* controller);
// Retrieve the active keyboard controller.
static KeyboardController* GetInstance();
// Returns true if keyboard is currently visible.
bool keyboard_visible() { return keyboard_visible_; }
bool show_on_resize() { return show_on_resize_; }
// Returns the current keyboard bounds. An empty rectangle will get returned
// when the keyboard is not shown or in FLOATING mode.
const gfx::Rect& current_keyboard_bounds() {
return current_keyboard_bounds_;
// For access to Observer methods for simulation.
friend class KeyboardControllerTest;
// aura::WindowObserver overrides
void OnWindowHierarchyChanged(const HierarchyChangeParams& params) override;
void OnWindowAddedToRootWindow(aura::Window* window) override;
void OnWindowRemovingFromRootWindow(aura::Window* window,
aura::Window* new_root) override;
void OnWindowBoundsChanged(aura::Window* window,
const gfx::Rect& old_bounds,
const gfx::Rect& new_bounds) override;
// InputMethodObserver overrides
void OnTextInputTypeChanged(const ui::TextInputClient* client) override {}
void OnFocus() override {}
void OnBlur() override {}
void OnCaretBoundsChanged(const ui::TextInputClient* client) override {}
void OnTextInputStateChanged(const ui::TextInputClient* client) override;
void OnInputMethodDestroyed(const ui::InputMethod* input_method) override;
void OnShowImeIfNeeded() override;
// Show virtual keyboard immediately with animation.
void ShowKeyboardInternal();
// Returns true if keyboard is scheduled to hide.
bool WillHideKeyboard() const;
// Called when show and hide animation finished successfully. If the animation
// is aborted, it won't be called.
void ShowAnimationFinished();
void HideAnimationFinished();
std::unique_ptr<KeyboardUI> ui_;
std::unique_ptr<aura::Window> container_;
// CallbackAnimationObserver should destructed before container_ because it
// uses container_'s animator.
std::unique_ptr<CallbackAnimationObserver> animation_observer_;
ui::InputMethod* input_method_;
bool keyboard_visible_;
bool show_on_resize_;
bool lock_keyboard_;
KeyboardMode keyboard_mode_;
ui::TextInputType type_;
base::ObserverList<KeyboardControllerObserver> observer_list_;
// The currently used keyboard position.
gfx::Rect current_keyboard_bounds_;
static KeyboardController* instance_;
base::WeakPtrFactory<KeyboardController> weak_factory_;
} // namespace keyboard