blob: aa8073884f34781bb5eaadc9e80b01d19844ac0f [file] [log] [blame]
// Copyright 2016 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.
#import <Foundation/Foundation.h>
@protocol LogoAnimationControllerOwner;
@protocol LogoAnimationControllerOwnerOwner;
typedef NS_ENUM(NSUInteger, LogoAnimationControllerLogoState) {
// A state in which the logo is displayed.
// A state in which the microphone icon is displayed.
#pragma mark LogoAnimationController
// Protocol for objects that act as logo animation controllers.
@protocol LogoAnimationController<NSObject>
#pragma mark LogoAnimationControllerOwner
// Protocol used to transfer ownership of LogoAnimationControllers between
// objects.
@protocol LogoAnimationControllerOwner
// The controller to be used during the animation. Setting this property to a
// new controller transfers ownership to the receiver, and resetting it to nil
// relinquishes the receiver's ownership of the object. When this property is
// set, the owner must add the new controller's view to its view hierarchy and
// remove the old controller's view.
@property(nonatomic, strong) id<LogoAnimationController>
// The default state used when the LogoAnimationController owned by the
// receiver is not showing dots or animating.
@property(nonatomic, readonly)
LogoAnimationControllerLogoState defaultLogoState;
#pragma mark LogoAnimationControllerOwnerOwner
// Protocol for objects that potentially own LogoAnimationControllerOwners and
// sometimes (but not always) use them to display UI. This extra layer of
// indirection is necessary to decide whether to reparent animation views during
// transition animations, as simply checking whether a
// LogoAnimationControllerOwner's logoAnimationController is nil is
// insufficient. This is because a LogoAnimationController may have been
// reparented, but its LogoAnimationControllerOwner should still be used as the
// endpoint in the animation if it is in a state where it can be displayed.
@protocol LogoAnimationControllerOwnerOwner
// The LogoAnimationControllerOwner held by the conforming object.
@property(nonatomic, readonly) id<LogoAnimationControllerOwner>