/*

 Copyright (C) 2015 Apple Inc. All Rights Reserved.

  See LICENSE.txt for this sample’s licensing information

  Abstract:

  The NSWindowController subclass managing the collapsible split views. 

 */

#import "CollapseWindowController.h"

#define kMinContrainValue 100.0f

@implementation CollapseWindowController

#pragma mark - NSSplitViewDelegate methods

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

//  canCollapseSubview:

//

//  This delegate allows the collapsing of the first and last subview.

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

- (BOOL)splitView:(NSSplitView *)splitView canCollapseSubview:(NSView *)subview

{

    BOOL canCollapseSubview = NO;

    NSArray *splitViewSubviews = splitView.subviews;

    NSUInteger splitViewSubviewCount = splitViewSubviews.count;

    if (subview == splitViewSubviews[0] || subview == splitViewSubviews[(splitViewSubviewCount - 1)])

    {

        canCollapseSubview = YES;

    }

    return canCollapseSubview;

}

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

//  shouldCollapseSubview:subView:dividerIndex

//

//  This delegate allows the collapsing of the first and last subview.

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

- (BOOL)splitView:(NSSplitView *)splitView shouldCollapseSubview:(NSView *)subview forDoubleClickOnDividerAtIndex:(NSInteger)dividerIndex

{

    // yes, if you can collapse you should collapse it

    return YES;

}

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

//  constrainMinCoordinate:proposedCoordinate:index

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

- (CGFloat)splitView:(NSSplitView *)splitView constrainMinCoordinate:(CGFloat)proposedCoordinate ofSubviewAt:(NSInteger)index

{

    CGFloat constrainedCoordinate = proposedCoordinate;

    if (index == 0)

    {

        constrainedCoordinate = proposedCoordinate + kMinContrainValue;

    }

    return constrainedCoordinate;

}

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

//  constrainMaxCoordinate:proposedCoordinate:proposedCoordinate:index

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

- (CGFloat)splitView:(NSSplitView *)splitView constrainMaxCoordinate:(CGFloat)proposedCoordinate ofSubviewAt:(NSInteger)index

{

    CGFloat constrainedCoordinate = proposedCoordinate;

    if (index == (splitView.subviews.count - 2))

    {

        constrainedCoordinate = proposedCoordinate - kMinContrainValue;

    }

    return constrainedCoordinate;   

}

@end