//
//  MPExpressionStorage.h
//  MathPad
//
//  Created by Kim Wittenburg on 22.04.14.
//  Copyright (c) 2014 Kim Wittenburg. All rights reserved.
//

#import "MPExpression.h"


/*!
 @header
 This file contains the <code>MPExpressionStorage</code> class.
 */



@class MPExpressionStorage, MPExpressionView, MPExpressionLayout;


/*!
    @class      MPExpressionStorage
    @abstract   An expression storage manages the contents of an expression view
                and notifies it when the underlying expression changes.
 */
@interface MPExpressionStorage : MPExpression

/*!
    @property   expressionView
    @abstract   The receiver's expression view.
 
    @discussion The expression view is the view that displays the contents of the
                expression storage. Normally you should not call the setter of
                this property. It is automatically assigned when the <code>@link
                //apple_ref/occ/instp/MPExpressionView/expressionStorage@/link</code>
                property of the <code>@link
                //apple_ref/occ/cl/MPExpressionView@/link</code> class is set.
 
                When this property is set the receiver assumes that the
                displaying expression view has changed. It then adapts to the
                properties of the new expression view and discards the root
                layout.
 */
@property (nonatomic, weak) MPExpressionView *expressionView;


/*!
    @property   rootLayout
    @abstract   The receiver's root layout.
 
    @discussion The root layout is the root node of the layout tree that draws
                the receiver's contents. For more information see the
                documentation on the <code>@link
                //apple_ref/occ/cl/MPLayout@/link</code> class.
 */
@property (nonatomic, strong) MPExpressionLayout *rootLayout;

@end