CollapseWindowController.m

/*
     File: CollapseWindowController.m 
 Abstract: The NSWindowController subclass managing the collapsible split views.
  
  Version: 1.0 
  
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 */
 
#import "CollapseWindowController.h"
 
#define kMinContrainValue 100.0f
 
 
@implementation CollapseWindowController
 
#pragma mark - NSSplitViewDelegate methods
 
// -------------------------------------------------------------------------------
//  awakeFromNib:
//
//  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 objectAtIndex:0] || subview == [splitViewSubviews objectAtIndex:(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