/*

 Copyright (C) 2018 Apple Inc. All Rights Reserved.

 See LICENSE.txt for this sample’s licensing information

 Abstract:

 IKImageBrowserView subclass used to override newCellForRepresentedItem.

 */

#import "ImageBrowserView.h"

#import "ImageBrowserCell.h"

@interface ImageBrowserView ()

@property NSRect lastVisibleRect;

@end

#pragma mark -

@implementation ImageBrowserView

//---------------------------------------------------------------------------------

// newCellForRepresentedItem:

//

// Allocate and return our own cell class for the specified item. The returned cell must not be autoreleased.

//---------------------------------------------------------------------------------

- (IKImageBrowserCell *)newCellForRepresentedItem:(id)cell

{

    return [[ImageBrowserCell alloc] init];

}

//---------------------------------------------------------------------------------

// drawRect:

//

// Override draw rect and force the background layer to redraw if the view did resize or did scroll.

//---------------------------------------------------------------------------------

- (void)drawRect:(NSRect)rect

{

    // retrieve the visible area

    NSRect visibleRect = self.visibleRect;

    // compare with the visible rect at the previous frame

    if (!NSEqualRects(visibleRect, self.lastVisibleRect))

    {

        // we did scroll or resize, redraw the background

        [[self backgroundLayer] setNeedsDisplay];

        // update last visible rect

        _lastVisibleRect = visibleRect;

    }

    [super drawRect:rect];

}

@end