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// Copyright 2019 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 "ash/ash_export.h"
#include "ash/home_screen/home_screen_presenter.h"
#include "ash/wallpaper/wallpaper_controller_observer.h"
#include "ash/wm/overview/overview_observer.h"
#include "base/macros.h"
namespace ash {
class HomeLauncherGestureHandler;
class HomeScreenDelegate;
// HomeScreenController handles the home launcher (e.g., tablet-mode app list)
// and owns the HomeLauncherGestureHandler that transitions the launcher window
// and other windows when the launcher is shown, hidden or animated.
class ASH_EXPORT HomeScreenController : public OverviewObserver,
public WallpaperControllerObserver {
~HomeScreenController() override;
// Returns true if the home screen can be shown (generally corresponds to the
// device being in tablet mode).
bool IsHomeScreenAvailable();
// Shows the home screen.
void Show();
// Takes the user to the home screen, either by ending Overview Mode/Split
// View Mode or by minimizing the other windows. Returns false if there was
// nothing to do because the given display was already "home".
bool GoHome(int64_t display_id);
// Sets the delegate for home screen animations.
void SetDelegate(HomeScreenDelegate* delegate);
// Called when a window starts/ends dragging. If the home screen is shown, we
// should hide it during dragging a window and reshow it when the drag ends.
void OnWindowDragStarted();
void OnWindowDragEnded();
HomeLauncherGestureHandler* home_launcher_gesture_handler() {
return home_launcher_gesture_handler_.get();
HomeScreenDelegate* delegate() { return delegate_; }
// OverviewObserver:
void OnOverviewModeStarting() override;
void OnOverviewModeEnding(OverviewSession* overview_session) override;
void OnOverviewModeEndingAnimationComplete(bool canceled) override;
// WallpaperControllerObserver:
void OnWallpaperPreviewStarted() override;
void OnWallpaperPreviewEnded() override;
// Updates the visibility of the home screen based on e.g. if the device is
// in overview mode.
void UpdateVisibility();
// Whether the wallpaper is being previewed. The home screen should be hidden
// during wallpaper preview.
bool in_wallpaper_preview_ = false;
// Whether we're currently in a window dragging process.
bool in_window_dragging_ = false;
// Not owned.
HomeScreenDelegate* delegate_ = nullptr;
// Owned pointer to the object which handles gestures related to the home
// launcher.
std::unique_ptr<HomeLauncherGestureHandler> home_launcher_gesture_handler_;
// Presenter that manages home screen animations.
HomeScreenPresenter home_screen_presenter_{this};
// Each time overview mode is exited, set this variable based on whether
// overview mode is sliding out, so the home launcher knows what to do when
// overview mode exit animations are finished.
bool use_slide_to_exit_overview_ = false;
} // namespace ash