108 lines
3.2 KiB
Objective-C
108 lines
3.2 KiB
Objective-C
// 15 august 2015
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#import "uipriv_darwin.h"
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NSLayoutConstraint *mkConstraint(id view1, NSLayoutAttribute attr1, NSLayoutRelation relation, id view2, NSLayoutAttribute attr2, CGFloat multiplier, CGFloat c, NSString *desc)
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{
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NSLayoutConstraint *constraint;
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constraint = [NSLayoutConstraint constraintWithItem:view1
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attribute:attr1
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relatedBy:relation
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toItem:view2
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attribute:attr2
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multiplier:multiplier
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constant:c];
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// apparently only added in 10.9
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if ([constraint respondsToSelector:@selector(setIdentifier:)])
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[((id) constraint) setIdentifier:desc];
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return constraint;
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}
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static CGFloat margins(int margined)
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{
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if (!margined)
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return 0.0;
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return 20.0; // TODO named constant
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}
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void singleChildConstraintsEstablish(struct singleChildConstraints *c, NSView *contentView, NSView *childView, BOOL hugsTrailing, BOOL hugsBottom, int margined, NSString *desc)
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{
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CGFloat margin;
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NSLayoutRelation relation;
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margin = margins(margined);
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c->leadingConstraint = mkConstraint(contentView, NSLayoutAttributeLeading,
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NSLayoutRelationEqual,
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childView, NSLayoutAttributeLeading,
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1, -margin,
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[desc stringByAppendingString:@" leading constraint"]);
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[contentView addConstraint:c->leadingConstraint];
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c->topConstraint = mkConstraint(contentView, NSLayoutAttributeTop,
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NSLayoutRelationEqual,
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childView, NSLayoutAttributeTop,
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1, -margin,
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[desc stringByAppendingString:@" top constraint"]);
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[contentView addConstraint:c->topConstraint];
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relation = NSLayoutRelationGreaterThanOrEqual;
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if (hugsTrailing)
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relation = NSLayoutRelationEqual;
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c->trailingConstraint = mkConstraint(contentView, NSLayoutAttributeTrailing,
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relation,
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childView, NSLayoutAttributeTrailing,
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1, margin,
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[desc stringByAppendingString:@" trailing constraint"]);
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[contentView addConstraint:c->trailingConstraint];
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relation = NSLayoutRelationGreaterThanOrEqual;
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if (hugsBottom)
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relation = NSLayoutRelationEqual;
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c->bottomConstraint = mkConstraint(contentView, NSLayoutAttributeBottom,
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relation,
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childView, NSLayoutAttributeBottom,
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1, margin,
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[desc stringByAppendingString:@" bottom constraint"]);
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[contentView addConstraint:c->bottomConstraint];
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}
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void singleChildConstraintsRemove(struct singleChildConstraints *c, NSView *cv)
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{
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if (c->leadingConstraint != nil) {
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[cv removeConstraint:c->leadingConstraint];
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[c->leadingConstraint release];
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c->leadingConstraint = nil;
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}
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if (c->topConstraint != nil) {
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[cv removeConstraint:c->topConstraint];
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[c->topConstraint release];
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c->topConstraint = nil;
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}
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if (c->trailingConstraint != nil) {
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[cv removeConstraint:c->trailingConstraint];
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[c->trailingConstraint release];
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c->trailingConstraint = nil;
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}
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if (c->bottomConstraint != nil) {
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[cv removeConstraint:c->bottomConstraint];
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[c->bottomConstraint release];
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c->bottomConstraint = nil;
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}
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}
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void singleChildConstraintsSetMargined(struct singleChildConstraints *c, int margined)
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{
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CGFloat margin;
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margin = margins(margined);
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if (c->leadingConstraint != nil)
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[c->leadingConstraint setConstant:-margin];
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if (c->topConstraint != nil)
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[c->topConstraint setConstant:-margin];
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if (c->trailingConstraint != nil)
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[c->trailingConstraint setConstant:margin];
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if (c->bottomConstraint != nil)
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[c->bottomConstraint setConstant:margin];
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}
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