mirror of
https://github.com/gnustep/libs-gui.git
synced 2025-05-29 20:17:38 +00:00
Implement constraintsWithVisualFormat method on NSLayoutConstraint
This commit is contained in:
Benjamin Johnson
parent
30d0dc66ee
commit
1aff56cb9b
5 changed files with 569 additions and 5 deletions
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@ -157,7 +157,12 @@ APPKIT_EXPORT_CLASS
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- (NSLayoutAnchor *) secondAnchor;
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- (NSLayoutPriority) priority;
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#if GS_HAS_DECLARED_PROPERTIES
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@property NSLayoutPriority priority;
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#else
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- (NSLayoutPriority) priority;
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- (void) setPriority: (NSLayoutPriority)priority;
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#endif
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@end
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@ -349,7 +349,8 @@ GSXibLoader.m \
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GSXibLoading.m \
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GSXibKeyedUnarchiver.m \
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GSXib5KeyedUnarchiver.m \
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GSHelpAttachment.m
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GSHelpAttachment.m \
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GSAutoLayoutVFLParser.m
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# Turn off NSMenuItem warning that NSMenuItem conforms to <NSObject>,
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# but does not implement <NSObject>'s methods itself (it inherits
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@ -658,7 +659,8 @@ GSWindowDecorationView.h \
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GSXibElement.h \
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GSXibLoading.h \
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GSXibKeyedUnarchiver.h \
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GSHelpAttachment.h
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GSHelpAttachment.h \
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GSAutoLayoutVFLParser.h
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libgnustep-gui_HEADER_FILES = ${GUI_HEADERS}
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22
Source/GSAutoLayoutVFLParser.h
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22
Source/GSAutoLayoutVFLParser.h
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@ -0,0 +1,22 @@
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#import <AppKit/AppKit.h>
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@interface GSAutoLayoutVFLParser : NSObject
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{
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NSDictionary *_views;
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NSLayoutFormatOptions _options;
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NSDictionary *_metrics;
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NSScanner *_scanner;
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NSMutableArray *_constraints;
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NSMutableArray *_layoutFormatConstraints;
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NSView *_view;
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BOOL _createLeadingConstraintToSuperview;
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BOOL _isVerticalOrientation;
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}
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-(instancetype)initWithFormat: (NSString*)format options: (NSLayoutFormatOptions)options metrics: (NSDictionary*)metrics views: (NSDictionary*)views;
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-(NSArray*)parse;
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@end
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526
Source/GSAutoLayoutVFLParser.m
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526
Source/GSAutoLayoutVFLParser.m
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@ -0,0 +1,526 @@
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#import "GSAutoLayoutVFLParser.h"
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#import <AppKit/AppKit.h>
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struct GSObjectOfPredicate {
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NSNumber *priority;
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NSView *view;
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NSLayoutRelation relation;
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CGFloat constant;
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};
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typedef struct GSObjectOfPredicate GSObjectOfPredicate;
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NSInteger const GS_DEFAULT_VIEW_SPACING = 8;
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NSInteger const GS_DEFAULT_SUPERVIEW_SPACING = 20;
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@implementation GSAutoLayoutVFLParser
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-(instancetype)initWithFormat: (NSString*)format options: (NSLayoutFormatOptions)options metrics: (NSDictionary*)metrics views: (NSDictionary*)views
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{
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if (self = [super init]) {
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if ([format length] == 0) {
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[self failParseWithMessage:@"Cannot parse an empty string"];
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}
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_views = views;
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_metrics = metrics;
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_options = options;
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_scanner = [NSScanner scannerWithString:format];
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_constraints = [NSMutableArray array];
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_layoutFormatConstraints = [NSMutableArray array];
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}
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return self;
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}
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-(NSArray*)parse
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{
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[self parseOrientation];
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NSNumber *spacingConstant = [self parseLeadingSuperViewConnection];
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NSView *previousView = nil;
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while (![_scanner isAtEnd]) {
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NSArray *viewConstraints = [self parseView];
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if (_createLeadingConstraintToSuperview) {
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[self addLeadingSuperviewConstraint: spacingConstant];
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_createLeadingConstraintToSuperview = NO;
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}
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if (previousView != nil) {
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[self addViewSpacingConstraint:spacingConstant previousView:previousView];
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[self addFormattingConstraints: previousView];
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}
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[_constraints addObjectsFromArray:viewConstraints];
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spacingConstant = [self parseConnection];
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if ([_scanner scanString:@"|" intoString:nil]) {
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[self addTrailingToSuperviewConstraint: spacingConstant];
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}
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previousView = _view;
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}
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[_constraints addObjectsFromArray:_layoutFormatConstraints];
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return _constraints;
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}
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-(void)addFormattingConstraints: (NSView*)lastView
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{
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BOOL hasFormatOptions = (_options & NSLayoutFormatAlignmentMask) > 0;
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if (!hasFormatOptions) {
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return;
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}
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[self assertHasValidFormatLayoutOptions];
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NSArray *attributes = [self layoutAttributesForLayoutFormatOptions:_options];
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for (NSNumber *layoutAttribute in attributes) {
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NSLayoutConstraint *formatConstraint = [NSLayoutConstraint constraintWithItem:lastView attribute:[layoutAttribute integerValue] relatedBy:NSLayoutRelationEqual toItem:_view attribute:[layoutAttribute integerValue] multiplier:1.0 constant:0];
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[_layoutFormatConstraints addObject:formatConstraint];
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}
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}
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-(void)assertHasValidFormatLayoutOptions
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{
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if (_isVerticalOrientation && [self isVerticalEdgeFormatLayoutOption: _options]) {
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[self failParseWithMessage:@"A vertical alignment format option cannot be used with a vertical layout"];
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} else if (!_isVerticalOrientation && ![self isVerticalEdgeFormatLayoutOption:_options]) {
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[self failParseWithMessage:@"A horizontal alignment format option cannot be used with a horizontal layout"];
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}
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}
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-(void)parseOrientation
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{
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if ([_scanner scanString:@"V:" intoString:nil]) {
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_isVerticalOrientation = true;
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} else {
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[_scanner scanString:@"H:" intoString:nil];
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}
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}
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-(NSArray*)parseView
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{
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[self parseViewOpen];
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_view = [self parseViewName];
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NSArray *viewConstraints = [self parsePredicateList];
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[self parseViewClose];
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return viewConstraints;
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}
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-(NSView*)parseViewName
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{
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NSString *viewName = nil;
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NSCharacterSet *viewTerminators = [NSCharacterSet characterSetWithCharactersInString:@"]("];
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[_scanner scanUpToCharactersFromSet:viewTerminators intoString:&viewName];
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if (viewName == nil) {
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[self failParseWithMessage:@"Failed to parse view name"];
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}
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if (![self isValidIdentifer:viewName]) {
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[self failParseWithMessage:@"Invalid view name. A view name must be a valid C identifier and may only contain letters, numbers and underscores"];
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}
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return [self resolveViewWithIdentifier:viewName];
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}
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-(BOOL)isVerticalEdgeFormatLayoutOption: (NSLayoutFormatOptions)options
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{
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if (options & NSLayoutFormatAlignAllTop) {
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return YES;
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}
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if (options & NSLayoutFormatAlignAllBaseline) {
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return YES;
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}
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if (options & NSLayoutFormatAlignAllFirstBaseline) {
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return YES;
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}
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if (options & NSLayoutFormatAlignAllBottom) {
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return YES;
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}
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if (options & NSLayoutFormatAlignAllCenterY) {
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return YES;
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}
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return NO;
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}
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-(void)addViewSpacingConstraint: (NSNumber*)spacing previousView: (NSView*)previousView
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{
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CGFloat viewSpacingConstant = spacing ? [spacing doubleValue] : GS_DEFAULT_VIEW_SPACING;
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NSLayoutAttribute firstAttribute;
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NSLayoutAttribute secondAttribute;
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NSView *firstItem;
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NSView *secondItem;
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NSLayoutFormatOptions directionOptions = _options & NSLayoutFormatDirectionMask;
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if (_isVerticalOrientation) {
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firstAttribute = NSLayoutAttributeTop;
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secondAttribute = NSLayoutAttributeBottom;
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firstItem = _view;
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secondItem = previousView;
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} else if (directionOptions & NSLayoutFormatDirectionRightToLeft) {
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firstAttribute = NSLayoutAttributeLeft;
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secondAttribute = NSLayoutAttributeRight;
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firstItem = previousView;
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secondItem = _view;
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} else if (directionOptions & NSLayoutFormatDirectionLeftToRight) {
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firstAttribute = NSLayoutAttributeLeft;
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secondAttribute = NSLayoutAttributeRight;
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firstItem = _view;
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secondItem = previousView;
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} else {
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firstAttribute = NSLayoutAttributeLeading;
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secondAttribute = NSLayoutAttributeTrailing;
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firstItem = _view;
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secondItem = previousView;
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}
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NSLayoutConstraint *viewSeparatorConstraint = [NSLayoutConstraint constraintWithItem:firstItem attribute:firstAttribute relatedBy:NSLayoutRelationEqual toItem:secondItem attribute:secondAttribute multiplier:1.0 constant:viewSpacingConstant];
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[_constraints addObject:viewSeparatorConstraint];
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}
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-(void)addLeadingSuperviewConstraint: (NSNumber*)spacing
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{
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NSLayoutAttribute firstAttribute;
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NSView *firstItem;
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NSView *secondItem;
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NSLayoutFormatOptions directionOptions = _options & NSLayoutFormatDirectionMask;
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if (_isVerticalOrientation) {
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firstAttribute = NSLayoutAttributeTop;
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firstItem = _view;
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secondItem = _view.superview;
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} else if (directionOptions & NSLayoutFormatDirectionRightToLeft) {
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firstAttribute = NSLayoutAttributeRight;
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firstItem = _view.superview;
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secondItem = _view;
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} else if (directionOptions & NSLayoutFormatDirectionLeftToRight) {
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firstAttribute = NSLayoutAttributeLeft;
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firstItem = _view;
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secondItem = _view.superview;
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} else {
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firstAttribute = _isVerticalOrientation ? NSLayoutAttributeTop : NSLayoutAttributeLeading;
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firstItem = _view;
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secondItem = _view.superview;
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}
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CGFloat viewSpacingConstant = spacing ? [spacing doubleValue] : GS_DEFAULT_SUPERVIEW_SPACING;
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NSLayoutConstraint *leadingConstraintToSuperview = [NSLayoutConstraint constraintWithItem:firstItem attribute:firstAttribute relatedBy:NSLayoutRelationEqual toItem:secondItem attribute:firstAttribute multiplier:1.0 constant:viewSpacingConstant];
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[_constraints addObject:leadingConstraintToSuperview];
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}
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-(void)addTrailingToSuperviewConstraint: (NSNumber*)spacing
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{
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CGFloat viewSpacingConstant = spacing ? [spacing doubleValue] : GS_DEFAULT_SUPERVIEW_SPACING;
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NSLayoutFormatOptions directionOptions = _options & NSLayoutFormatDirectionMask;
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NSLayoutAttribute attribute;
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NSView *firstItem;
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NSView *secondItem;
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if (_isVerticalOrientation) {
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attribute = NSLayoutAttributeBottom;
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firstItem = _view.superview;
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secondItem = _view;
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} else if (directionOptions & NSLayoutFormatDirectionRightToLeft) {
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attribute = NSLayoutAttributeLeft;
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firstItem = _view;
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secondItem = _view.superview;
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} else if (directionOptions & NSLayoutFormatDirectionLeftToRight) {
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attribute = NSLayoutAttributeRight;
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firstItem = _view.superview;
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secondItem = _view;
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} else {
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attribute = NSLayoutAttributeTrailing;
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firstItem = _view.superview;
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secondItem = _view;
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}
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NSLayoutConstraint *trailingConstraintToSuperview = [NSLayoutConstraint constraintWithItem: firstItem attribute:attribute relatedBy:NSLayoutRelationEqual toItem: secondItem attribute:attribute multiplier:1.0 constant:viewSpacingConstant];
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[_constraints addObject:trailingConstraintToSuperview];
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}
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-(NSNumber*)parseLeadingSuperViewConnection
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{
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BOOL foundSuperview = [_scanner scanString:@"|" intoString:nil];
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if (!foundSuperview) {
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return nil;
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}
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_createLeadingConstraintToSuperview = YES;
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return [self parseConnection];
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}
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-(NSNumber*)parseConnection
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{
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BOOL foundConnection = [_scanner scanString:@"-" intoString:nil];
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if (!foundConnection) {
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return [NSNumber numberWithDouble:0];
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}
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NSNumber *simplePredicateValue = [self parseSimplePredicate];
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BOOL endConnectionFound = [_scanner scanString:@"-" intoString:nil];
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if (simplePredicateValue != nil && !endConnectionFound) {
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[self failParseWithMessage:@"A connection must end with a '-'"];
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} else if (simplePredicateValue == nil && endConnectionFound) {
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[self failParseWithMessage:@"Found invalid connection"];
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}
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return simplePredicateValue;
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}
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-(NSNumber*)parseSimplePredicate
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{
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float constant;
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BOOL scanConstantResult = [_scanner scanFloat:&constant];
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if (scanConstantResult) {
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return [NSNumber numberWithDouble:constant];
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} else {
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NSString *metricName = nil;
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NSCharacterSet *simplePredicateTerminatorsCharacterSet = [NSCharacterSet characterSetWithCharactersInString:@"-[|"];
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BOOL didParseMetricName = [_scanner scanUpToCharactersFromSet:simplePredicateTerminatorsCharacterSet intoString:&metricName];
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if (!didParseMetricName) {
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return nil;
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}
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if (![self isValidIdentifer:metricName]) {
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[self failParseWithMessage:@"Invalid metric identifier. Metric identifiers must be a valid C identifier and may only contain letters, numbers and underscores"];
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}
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NSNumber *metric = [self resolveMetricWithIdentifier:metricName];
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return metric;
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}
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}
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-(NSArray*)parsePredicateList
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{
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BOOL startsWithPredicateList = [_scanner scanString:@"(" intoString:nil];
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if (!startsWithPredicateList) {
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return [NSArray array];
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}
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NSMutableArray *viewPredicateConstraints = [NSMutableArray array];
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BOOL shouldParsePredicate = YES;
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while (shouldParsePredicate) {
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GSObjectOfPredicate *predicate = [self parseObjectOfPredicate];
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[viewPredicateConstraints addObject:[self createConstraintFromParsedPredicate:predicate]];
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[self freeObjectOfPredicate:predicate];
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shouldParsePredicate = [_scanner scanString:@"," intoString:nil];
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}
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if (![_scanner scanString:@")" intoString:nil]) {
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[self failParseWithMessage:@"A predicate on a view must end with ')'"];
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}
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return viewPredicateConstraints;
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}
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-(NSLayoutConstraint*)createConstraintFromParsedPredicate: (GSObjectOfPredicate*)predicate
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{
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NSLayoutConstraint *constraint = nil;
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NSLayoutAttribute attribute = _isVerticalOrientation ? NSLayoutAttributeHeight : NSLayoutAttributeWidth;
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if (predicate->view != nil) {
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constraint = [NSLayoutConstraint constraintWithItem:_view attribute:attribute relatedBy:predicate->relation toItem:predicate->view attribute:attribute multiplier:1.0 constant:predicate->constant];
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} else {
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constraint = [NSLayoutConstraint constraintWithItem:_view attribute:attribute relatedBy:predicate->relation toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1.0 constant:predicate->constant];
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}
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if (predicate->priority) {
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constraint.priority = [predicate->priority doubleValue];
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}
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return constraint;
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}
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-(GSObjectOfPredicate*)parseObjectOfPredicate
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{
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NSLayoutRelation relation = [self parseRelation];
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CGFloat parsedConstant;
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NSView *predicatedView = nil;
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BOOL scanConstantResult = [_scanner scanDouble:&parsedConstant];
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if (!scanConstantResult) {
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NSString *identiferName = [self parseIdentifier];
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if (![self isValidIdentifer:identiferName]) {
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[self failParseWithMessage:@"Invalid metric or view identifier. Metric/View identifiers must be a valid C identifier and may only contain letters, numbers and underscores"];
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}
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NSNumber *metric = [_metrics objectForKey:identiferName];
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if (metric != nil) {
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parsedConstant = [metric doubleValue];
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} else if ([_views objectForKey:identiferName]) {
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parsedConstant = 0;
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predicatedView = [_views objectForKey:identiferName];
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} else {
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NSString *message = [NSString stringWithFormat:@"Failed to find constant or metric for identifier '%@'", identiferName];
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[self failParseWithMessage:message];
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}
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}
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NSNumber *priorityValue = [self parsePriority];
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GSObjectOfPredicate *predicate = calloc(1, sizeof(GSObjectOfPredicate));
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predicate->priority = priorityValue;
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predicate->relation = relation;
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predicate->constant = parsedConstant;
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predicate->view = predicatedView;
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return predicate;
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}
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-(NSLayoutRelation)parseRelation
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{
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if ([_scanner scanString:@"==" intoString:nil]) {
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return NSLayoutRelationEqual;
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} else if ([_scanner scanString:@">=" intoString:nil]) {
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return NSLayoutRelationGreaterThanOrEqual;
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} else if ([_scanner scanString:@"<=" intoString:nil]) {
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return NSLayoutRelationLessThanOrEqual;
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} else {
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return NSLayoutRelationEqual;
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}
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}
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-(NSNumber*)parsePriority
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{
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NSCharacterSet *priorityMarkerCharacterSet = [NSCharacterSet characterSetWithCharactersInString:@"@"];
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BOOL foundPriorityMarker = [_scanner scanCharactersFromSet:priorityMarkerCharacterSet intoString:nil];
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if (!foundPriorityMarker) {
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return nil;
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}
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return [self parseConstant];
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}
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-(NSNumber*)resolveMetricWithIdentifier: (NSString*)identifier
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{
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NSNumber *metric = [_metrics objectForKey:identifier];
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if (metric == nil) {
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[self failParseWithMessage:@"Found metric not inside metric dictionary"];
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}
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return metric;
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}
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-(NSView*)resolveViewWithIdentifier: (NSString*)identifier
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{
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NSView *view = [_views objectForKey:identifier];
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if (view == nil) {
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[self failParseWithMessage:@"Found view not inside view dictionary"];
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}
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return view;
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}
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-(NSNumber*)parseConstant
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{
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CGFloat constant;
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BOOL scanConstantResult = [_scanner scanDouble:&constant];
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if (scanConstantResult) {
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return [NSNumber numberWithFloat:constant];
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}
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NSString *metricName = [self parseIdentifier];
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if (![self isValidIdentifer:metricName]) {
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[self failParseWithMessage:@"Invalid metric identifier. Metric identifiers must be a valid C identifier and may only contain letters, numbers and underscores"];
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}
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|
||||
return [self resolveMetricWithIdentifier:metricName];
|
||||
}
|
||||
|
||||
-(NSString*)parseIdentifier
|
||||
{
|
||||
NSString *identifierName = nil;
|
||||
NSCharacterSet *identifierTerminators = [NSCharacterSet characterSetWithCharactersInString:@"),"];
|
||||
BOOL scannedIdentifier = [_scanner scanUpToCharactersFromSet:identifierTerminators intoString:&identifierName];
|
||||
if (!scannedIdentifier) {
|
||||
[self failParseWithMessage:@"Failed to find constant or metric"];
|
||||
}
|
||||
|
||||
return identifierName;
|
||||
}
|
||||
|
||||
-(void)parseViewOpen
|
||||
{
|
||||
NSCharacterSet *openViewIdentifier = [NSCharacterSet characterSetWithCharactersInString:@"["];
|
||||
BOOL scannedOpenBracket = [_scanner scanCharactersFromSet:openViewIdentifier intoString:nil];
|
||||
if (!scannedOpenBracket) {
|
||||
[[NSException exceptionWithName:NSInternalInconsistencyException reason:@"A view must start with a '['" userInfo:nil] raise];
|
||||
}
|
||||
}
|
||||
|
||||
-(void)parseViewClose
|
||||
{
|
||||
NSCharacterSet *closeViewIdentifier = [NSCharacterSet characterSetWithCharactersInString:@"]"];
|
||||
BOOL scannedCloseBracket = [_scanner scanCharactersFromSet:closeViewIdentifier intoString:nil];
|
||||
if (!scannedCloseBracket) {
|
||||
[[NSException exceptionWithName:NSInternalInconsistencyException reason:@"A view must end with a ']'" userInfo:nil] raise];
|
||||
}
|
||||
}
|
||||
|
||||
-(BOOL)isValidIdentifer: (NSString*)identifer
|
||||
{
|
||||
NSRegularExpression *cIdentifierRegex = [NSRegularExpression regularExpressionWithPattern:@"^[a-zA-Z_][a-zA-Z0-9_]*$" options:0 error:nil];
|
||||
NSArray *matches = [cIdentifierRegex matchesInString:identifer options:0 range:NSMakeRange(0, identifer.length)];
|
||||
|
||||
return [matches count] > 0;
|
||||
}
|
||||
|
||||
-(NSArray*)layoutAttributesForLayoutFormatOptions: (NSLayoutFormatOptions)options {
|
||||
NSMutableArray *attributes = [NSMutableArray array];
|
||||
|
||||
if (options & NSLayoutFormatAlignAllLeft) {
|
||||
[attributes addObject:[NSNumber numberWithInteger:NSLayoutAttributeLeft]];
|
||||
}
|
||||
if (options & NSLayoutFormatAlignAllRight) {
|
||||
[attributes addObject:[NSNumber numberWithInteger:NSLayoutAttributeRight]];
|
||||
}
|
||||
if (options & NSLayoutFormatAlignAllTop) {
|
||||
[attributes addObject:[NSNumber numberWithInteger:NSLayoutAttributeTop]];
|
||||
}
|
||||
if (options & NSLayoutFormatAlignAllBottom) {
|
||||
[attributes addObject:[NSNumber numberWithInteger:NSLayoutAttributeBottom]];
|
||||
}
|
||||
if (options & NSLayoutFormatAlignAllLeading) {
|
||||
[attributes addObject:[NSNumber numberWithInteger:NSLayoutAttributeLeading]];
|
||||
}
|
||||
if (options & NSLayoutFormatAlignAllTrailing) {
|
||||
[attributes addObject:[NSNumber numberWithInteger:NSLayoutAttributeTrailing]];
|
||||
}
|
||||
if (options & NSLayoutFormatAlignAllCenterX) {
|
||||
[attributes addObject:[NSNumber numberWithInteger:NSLayoutAttributeCenterX]];
|
||||
}
|
||||
if (options & NSLayoutFormatAlignAllCenterY) {
|
||||
[attributes addObject:[NSNumber numberWithInteger:NSLayoutAttributeCenterY]];
|
||||
}
|
||||
if (options & NSLayoutFormatAlignAllBaseline) {
|
||||
[attributes addObject:[NSNumber numberWithInteger:NSLayoutAttributeBaseline]];
|
||||
}
|
||||
if (options & NSLayoutFormatAlignAllFirstBaseline) {
|
||||
[attributes addObject:[NSNumber numberWithInteger:NSLayoutAttributeFirstBaseline]];
|
||||
}
|
||||
|
||||
if ([attributes count] == 0) {
|
||||
[self failParseWithMessage:@"Unrecognized layout formatting option"];
|
||||
}
|
||||
|
||||
return attributes;
|
||||
}
|
||||
|
||||
-(void)failParseWithMessage: (NSString*)parseErrorMessage
|
||||
{
|
||||
NSException *parseException = [NSException exceptionWithName:NSInvalidArgumentException reason:[NSString stringWithFormat:@"Unable to parse constraint format: %@", parseErrorMessage] userInfo:nil];
|
||||
[parseException raise];
|
||||
}
|
||||
|
||||
|
||||
-(void)freeObjectOfPredicate: (GSObjectOfPredicate*)predicate
|
||||
{
|
||||
predicate->view = nil;
|
||||
predicate->priority = nil;
|
||||
free(predicate);
|
||||
}
|
||||
|
||||
@end
|
||||
|
|
@ -32,6 +32,7 @@
|
|||
#import "AppKit/NSLayoutConstraint.h"
|
||||
#import "AppKit/NSWindow.h"
|
||||
#import "AppKit/NSApplication.h"
|
||||
#import "GSAutoLayoutVFLParser.h"
|
||||
|
||||
static NSMutableArray *activeConstraints = nil;
|
||||
// static NSNotificationCenter *nc = nil;
|
||||
|
|
@ -236,8 +237,16 @@ static NSMutableArray *activeConstraints = nil;
|
|||
metrics: (NSDictionary *)metrics
|
||||
views: (NSDictionary *)views
|
||||
{
|
||||
NSMutableArray *array = [NSMutableArray arrayWithCapacity: 10];
|
||||
return array;
|
||||
GSAutoLayoutVFLParser *parser = [[GSAutoLayoutVFLParser alloc]
|
||||
initWithFormat: fmt
|
||||
options: opt
|
||||
metrics: metrics
|
||||
views: views];
|
||||
NSArray *constraints = [parser parse];
|
||||
|
||||
[parser release];
|
||||
|
||||
return constraints;
|
||||
}
|
||||
|
||||
- (instancetype) initWithItem: (id)firstItem
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue