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/* Implementation of class NSAutoresizingMaskLayoutConstraint
Copyright (C) 2023 Free Software Foundation, Inc.
By: Benjamin Johnson <benjaminkylejohnson@gmail.com>
Date: 2023
This file is part of the GNUstep Library.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110 USA.
*/
#import "NSAutoresizingMaskLayoutConstraint.h"
@implementation NSAutoresizingMaskLayoutConstraint
static NSUInteger minXAttribute = 32;
static NSUInteger minYAttribute = 33;
static NSUInteger maxXAttribute = 36;
static NSUInteger maxYAttribute = 37;
+ (NSAutoresizingMaskLayoutConstraint *)
_xConstraintForAutoresizingMask: (NSAutoresizingMaskOptions)autoresizingMask
subitem: (NSView *)subItem
frame: (NSRect)frame
superitem: (NSView *)superItem
bounds: (NSRect)bounds
{
if ((autoresizingMask & NSViewMinXMargin)
&& (autoresizingMask & NSViewMaxXMargin))
{
CGFloat width = bounds.size.width - frame.size.width;
CGFloat x = frame.origin.x - bounds.origin.x;
CGFloat xWidthRatio = x / width;
CGFloat constant = xWidthRatio * frame.size.width * -1;
return [NSAutoresizingMaskLayoutConstraint
constraintWithItem: subItem
attribute: minXAttribute
relatedBy: NSLayoutRelationEqual
toItem: superItem
attribute: NSLayoutAttributeWidth
multiplier: xWidthRatio
constant: constant];
}
else if (autoresizingMask & NSViewMinXMargin)
{
return [NSAutoresizingMaskLayoutConstraint
constraintWithItem: superItem
attribute: NSLayoutAttributeWidth
relatedBy: NSLayoutRelationEqual
toItem: subItem
attribute: maxXAttribute
multiplier: 1.0
constant: (frame.size.width + frame.origin.x
- bounds.size.width - bounds.origin.x)
* -1];
}
else if (autoresizingMask & NSViewMaxXMargin)
{
return [NSAutoresizingMaskLayoutConstraint
constraintWithItem: subItem
attribute: minXAttribute
relatedBy: NSLayoutRelationEqual
toItem: nil
attribute: NSLayoutAttributeNotAnAttribute
multiplier: 1.0
constant: frame.origin.x - bounds.origin.x];
}
else
{
return [NSAutoresizingMaskLayoutConstraint
constraintWithItem: subItem
attribute: minXAttribute
relatedBy: NSLayoutRelationEqual
toItem: nil
attribute: NSLayoutAttributeNotAnAttribute
multiplier: 1.0
constant: frame.origin.x - bounds.origin.x];
}
}
+ (NSAutoresizingMaskLayoutConstraint *)
_yConstraintForAutoresizingMask: (NSAutoresizingMaskOptions)autoresizingMask
subitem: (NSView *)subItem
frame: (NSRect)frame
superitem: (NSView *)superItem
bounds: (NSRect)bounds
{
if ((autoresizingMask & NSViewMinYMargin)
&& (autoresizingMask & NSViewMaxYMargin))
{
CGFloat height = bounds.size.height - frame.size.height;
CGFloat y = frame.origin.y - bounds.origin.y;
CGFloat yHeightRatio = y / height;
CGFloat constant = yHeightRatio * frame.size.height * -1;
return [NSAutoresizingMaskLayoutConstraint
constraintWithItem: subItem
attribute: minYAttribute
relatedBy: NSLayoutRelationEqual
toItem: superItem
attribute: NSLayoutAttributeHeight
multiplier: yHeightRatio
constant: constant];
}
else if (autoresizingMask & NSViewMinYMargin)
{
CGFloat constant = ((frame.size.height + frame.origin.y)
- (bounds.size.height + bounds.origin.y))
* -1;
return [NSAutoresizingMaskLayoutConstraint
constraintWithItem: superItem
attribute: NSLayoutAttributeHeight
relatedBy: NSLayoutRelationEqual
toItem: subItem
attribute: maxYAttribute
multiplier: 1.0
constant: constant];
}
else if (autoresizingMask & NSViewMaxYMargin)
{
CGFloat constant = (frame.origin.y - bounds.origin.y);
return [NSAutoresizingMaskLayoutConstraint
constraintWithItem: subItem
attribute: minYAttribute
relatedBy: NSLayoutRelationEqual
toItem: nil
attribute: NSLayoutAttributeNotAnAttribute
multiplier: 1.0
constant: constant];
}
else
{
return [NSAutoresizingMaskLayoutConstraint
constraintWithItem: subItem
attribute: minYAttribute
relatedBy: NSLayoutRelationEqual
toItem: nil
attribute: NSLayoutAttributeNotAnAttribute
multiplier: 1.0
constant: frame.origin.y - bounds.origin.y];
}
}
+ (NSAutoresizingMaskLayoutConstraint *)
_widthConstraintForAutoresizingMask:
(NSAutoresizingMaskOptions)autoresizingMask
subitem: (NSView *)subItem
frame: (NSRect)frame
superitem: (NSView *)superItem
bounds: (NSRect)bounds
{
if (autoresizingMask & NSViewWidthSizable)
{
CGFloat widthConstant = ((frame.size.width + frame.origin.x)
- (bounds.origin.x + bounds.size.width))
* -1;
return [NSAutoresizingMaskLayoutConstraint
constraintWithItem: superItem
attribute: NSLayoutAttributeWidth
relatedBy: NSLayoutRelationEqual
toItem: subItem
attribute: maxXAttribute
multiplier: 1.0
constant: widthConstant];
}
else
{
return [NSAutoresizingMaskLayoutConstraint
constraintWithItem: subItem
attribute: NSLayoutAttributeWidth
relatedBy: NSLayoutRelationEqual
toItem: nil
attribute: NSLayoutAttributeNotAnAttribute
multiplier: 1.0
constant: frame.size.width];
}
}
+ (NSAutoresizingMaskLayoutConstraint *)
_heightConstraintForAutoresizingMask:
(NSAutoresizingMaskOptions)autoresizingMask
subitem: (NSView *)subItem
frame: (NSRect)frame
superitem: (NSView *)superItem
bounds: (NSRect)bounds
{
if (autoresizingMask & NSViewHeightSizable)
{
CGFloat heightConstant = (frame.size.height + frame.origin.y
- (bounds.origin.y + bounds.size.height))
* -1;
return [NSAutoresizingMaskLayoutConstraint
constraintWithItem: superItem
attribute: NSLayoutAttributeHeight
relatedBy: NSLayoutRelationEqual
toItem: subItem
attribute: maxYAttribute
multiplier: 1.0
constant: heightConstant];
}
else
{
return [NSAutoresizingMaskLayoutConstraint
constraintWithItem: subItem
attribute: NSLayoutAttributeHeight
relatedBy: NSLayoutRelationEqual
toItem: nil
attribute: NSLayoutAttributeNotAnAttribute
multiplier: 1.0
constant: frame.size.height];
}
}
+ (NSArray *)constraintsWithAutoresizingMask:
(NSAutoresizingMaskOptions) autoresizingMask
subitem: (NSView *) subItem
frame: (NSRect) frame
superitem: (NSView *) superItem
bounds: (NSRect) bounds
{
if (autoresizingMask == NSViewNotSizable)
{
return [NSArray array];
}
NSAutoresizingMaskLayoutConstraint *xConstraint =
[self _xConstraintForAutoresizingMask: autoresizingMask
subitem: subItem
frame: frame
superitem: superItem
bounds: bounds];
NSAutoresizingMaskLayoutConstraint *yConstraint =
[self _yConstraintForAutoresizingMask: autoresizingMask
subitem: subItem
frame: frame
superitem: superItem
bounds: bounds];
NSAutoresizingMaskLayoutConstraint *widthConstraint =
[self _widthConstraintForAutoresizingMask: autoresizingMask
subitem: subItem
frame: frame
superitem: superItem
bounds: bounds];
NSAutoresizingMaskLayoutConstraint *heightConstraint =
[self _heightConstraintForAutoresizingMask: autoresizingMask
subitem: subItem
frame: frame
superitem: superItem
bounds: bounds];
NSMutableArray *constraints = [NSMutableArray arrayWithCapacity:4];
// The order of constraints was determined from MacOS behaviour.
// For the majority of users it will not matter, but we should assume that users have coupled to the ordering.
if ((autoresizingMask & NSViewMinXMargin)
&& (autoresizingMask & NSViewMaxXMargin))
{
[constraints addObject: widthConstraint];
[constraints addObject: xConstraint];
}
else
{
[constraints addObject: xConstraint];
[constraints addObject: widthConstraint];
}
if ((autoresizingMask & NSViewMinYMargin)
&& (autoresizingMask & NSViewMaxYMargin))
{
[constraints addObject: heightConstraint];
[constraints addObject: yConstraint];
}
else
{
[constraints addObject: yConstraint];
[constraints addObject: heightConstraint];
}
return constraints;
}
@end
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