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//
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// NSLayoutConstraint+PureLayout.m
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// https://github.com/PureLayout/PureLayout
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//
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// Copyright (c) 2013-2015 Tyler Fox
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//
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// This code is distributed under the terms and conditions of the MIT license.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to
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// deal in the Software without restriction, including without limitation the
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// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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// sell copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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// IN THE SOFTWARE.
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//
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#import "NSLayoutConstraint+PureLayout.h"
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#import "ALView+PureLayout.h"
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#import "NSArray+PureLayout.h"
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#import "PureLayout+Internal.h"
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#pragma mark - NSLayoutConstraint+PureLayout
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@implementation NSLayoutConstraint (PureLayout)
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#pragma mark Batch Constraint Creation
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/**
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A global variable that stores a stack of arrays of constraints created without being immediately installed.
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When executing a constraints block passed into the +[autoCreateConstraintsWithoutInstalling:] method, a new
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mutable array is pushed onto this stack, and all constraints created with PureLayout in the block are added
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to this array. When the block finishes executing, the array is popped off this stack. Automatic constraint
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installation is prevented if this stack contains at least 1 array.
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NOTE: Access to this variable is not synchronized (and should only be done on the main thread).
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*/
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static PL__NSMutableArray_of(PL__NSMutableArray_of(NSLayoutConstraint *) *) *_al_arraysOfCreatedConstraints = nil;
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/**
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A global variable that is set to YES when installing a batch of constraints collected from a call to +[autoCreateAndInstallConstraints].
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When this flag is YES, constraints are installed immediately without checking for or adding to the +[al_currentArrayOfCreatedConstraints].
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This is necessary to properly handle nested calls to +[autoCreateAndInstallConstraints], where calls whose block contains other call(s)
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should not return constraints from within the blocks of nested call(s).
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*/
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static BOOL _al_isInstallingCreatedConstraints = NO;
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/**
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Accessor for the global state that stores arrays of constraints created without being installed.
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*/
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+ (PL__NSMutableArray_of(PL__NSMutableArray_of(NSLayoutConstraint *) *) *)al_arraysOfCreatedConstraints
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{
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NSAssert([NSThread isMainThread], @"PureLayout is not thread safe, and must be used exclusively from the main thread.");
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if (!_al_arraysOfCreatedConstraints) {
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_al_arraysOfCreatedConstraints = [NSMutableArray new];
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}
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return _al_arraysOfCreatedConstraints;
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}
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/**
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Accessor for the current mutable array of constraints created without being immediately installed.
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*/
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+ (PL__NSMutableArray_of(NSLayoutConstraint *) *)al_currentArrayOfCreatedConstraints
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{
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return [[self al_arraysOfCreatedConstraints] lastObject];
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}
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/**
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Accessor for the global state that determines whether automatic constraint installation should be prevented.
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*/
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+ (BOOL)al_preventAutomaticConstraintInstallation
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{
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return (_al_isInstallingCreatedConstraints == NO) && ([[self al_arraysOfCreatedConstraints] count] > 0);
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}
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/**
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Creates all of the constraints in the block, then installs (activates) them all at once.
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All constraints created from calls to the PureLayout API in the block are returned in a single array.
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This may be more efficient than installing (activating) each constraint one-by-one.
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Note: calls to this method may be nested. The constraints returned from a call will NOT include constraints
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created in nested calls; constraints are only returned from the inner-most call they are created within.
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@param block A block of method calls to the PureLayout API that create constraints.
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@return An array of the constraints that were created from calls to the PureLayout API inside the block.
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*/
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+ (PL__NSArray_of(NSLayoutConstraint *) *)autoCreateAndInstallConstraints:(__attribute__((noescape)) ALConstraintsBlock)block
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{
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NSArray *createdConstraints = [self autoCreateConstraintsWithoutInstalling:block];
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_al_isInstallingCreatedConstraints = YES;
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[createdConstraints autoInstallConstraints];
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_al_isInstallingCreatedConstraints = NO;
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return createdConstraints;
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}
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/**
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Creates all of the constraints in the block but prevents them from being automatically installed (activated).
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All constraints created from calls to the PureLayout API in the block are returned in a single array.
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Note: calls to this method may be nested. The constraints returned from a call will NOT include constraints
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created in nested calls; constraints are only returned from the inner-most call they are created within.
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@param block A block of method calls to the PureLayout API that create constraints.
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@return An array of the constraints that were created from calls to the PureLayout API inside the block.
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*/
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+ (PL__NSArray_of(NSLayoutConstraint *) *)autoCreateConstraintsWithoutInstalling:(__attribute__((noescape)) ALConstraintsBlock)block
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{
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NSAssert(block, @"The constraints block cannot be nil.");
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NSArray *createdConstraints = nil;
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if (block) {
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[[self al_arraysOfCreatedConstraints] addObject:[NSMutableArray new]];
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block();
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createdConstraints = [self al_currentArrayOfCreatedConstraints];
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[[self al_arraysOfCreatedConstraints] removeLastObject];
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}
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return createdConstraints;
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}
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#pragma mark Set Priority For Constraints
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/**
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A global variable that stores a stack of layout priorities to set on constraints.
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When executing a constraints block passed into the +[autoSetPriority:forConstraints:] method, the priority for
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that call is pushed onto this stack, and when the block finishes executing, that priority is popped off this
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stack. If this stack contains at least 1 priority, the priority at the top of the stack will be set for all
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constraints created by this library (even if automatic constraint installation is being prevented).
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NOTE: Access to this variable is not synchronized (and should only be done on the main thread).
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*/
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static PL__NSMutableArray_of(NSNumber *) *_al_globalConstraintPriorities = nil;
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/**
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Accessor for the global stack of layout priorities.
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*/
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+ (PL__NSMutableArray_of(NSNumber *) *)al_globalConstraintPriorities
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{
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NSAssert([NSThread isMainThread], @"PureLayout is not thread safe, and must be used exclusively from the main thread.");
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if (!_al_globalConstraintPriorities) {
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_al_globalConstraintPriorities = [NSMutableArray new];
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}
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return _al_globalConstraintPriorities;
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}
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/**
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Returns the current layout priority to use for constraints.
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When executing a constraints block passed into +[autoSetPriority:forConstraints:], this will return
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the priority for the current block. Otherwise, the default Required priority is returned.
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*/
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+ (ALLayoutPriority)al_currentGlobalConstraintPriority
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{
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PL__NSMutableArray_of(NSNumber *) *globalConstraintPriorities = [self al_globalConstraintPriorities];
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if ([globalConstraintPriorities count] == 0) {
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return ALLayoutPriorityRequired;
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}
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return [[globalConstraintPriorities lastObject] floatValue];
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}
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/**
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Accessor for the global state that determines if we're currently in the scope of a priority constraints block.
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*/
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+ (BOOL)al_isExecutingPriorityConstraintsBlock
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{
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return [[self al_globalConstraintPriorities] count] > 0;
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}
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/**
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Sets the constraint priority to the given value for all constraints created using the PureLayout
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API within the given constraints block.
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NOTE: This method will have no effect (and will NOT set the priority) on constraints created or added
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without using the PureLayout API!
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@param priority The layout priority to be set on all constraints created in the constraints block.
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@param block A block of method calls to the PureLayout API that create and install constraints.
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*/
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+ (void)autoSetPriority:(ALLayoutPriority)priority forConstraints:(__attribute__((noescape)) ALConstraintsBlock)block
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{
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NSAssert(block, @"The constraints block cannot be nil.");
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if (block) {
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[[self al_globalConstraintPriorities] addObject:@(priority)];
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block();
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[[self al_globalConstraintPriorities] removeLastObject];
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}
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}
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#pragma mark Identify Constraints
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#if PL__PureLayout_MinBaseSDK_iOS_8_0 || PL__PureLayout_MinBaseSDK_OSX_10_10
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/**
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A global variable that stores a stack of identifier strings to set on constraints.
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When executing a constraints block passed into the +[autoSetIdentifier:forConstraints:] method, the identifier for
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that call is pushed onto this stack, and when the block finishes executing, that identifier is popped off this
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stack. If this stack contains at least 1 identifier, the identifier at the top of the stack will be set for all
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constraints created by this library (even if automatic constraint installation is being prevented).
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NOTE: Access to this variable is not synchronized (and should only be done on the main thread).
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*/
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static PL__NSMutableArray_of(NSString *) *_al_globalConstraintIdentifiers = nil;
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/**
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Accessor for the global state of constraint identifiers.
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*/
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+ (PL__NSMutableArray_of(NSString *) *)al_globalConstraintIdentifiers
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{
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NSAssert([NSThread isMainThread], @"PureLayout is not thread safe, and must be used exclusively from the main thread.");
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if (!_al_globalConstraintIdentifiers) {
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_al_globalConstraintIdentifiers = [NSMutableArray new];
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}
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return _al_globalConstraintIdentifiers;
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}
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/**
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Returns the current identifier string to use for constraints.
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When executing a constraints block passed into +[autoSetIdentifier:forConstraints:], this will return
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the identifier for the current block. Otherwise, nil is returned.
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*/
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+ (NSString *)al_currentGlobalConstraintIdentifier
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{
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PL__NSMutableArray_of(NSString *) *globalConstraintIdentifiers = [self al_globalConstraintIdentifiers];
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if ([globalConstraintIdentifiers count] == 0) {
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return nil;
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}
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return [globalConstraintIdentifiers lastObject];
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}
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/**
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Sets the identifier for all constraints created using the PureLayout API within the given constraints block.
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NOTE: This method will have no effect (and will NOT set the identifier) on constraints created or added
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without using the PureLayout API!
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@param identifier A string used to identify all constraints created in the constraints block.
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@param block A block of method calls to the PureLayout API that create and install constraints.
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*/
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+ (void)autoSetIdentifier:(NSString *)identifier forConstraints:(__attribute__((noescape)) ALConstraintsBlock)block
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{
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NSAssert(block, @"The constraints block cannot be nil.");
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NSAssert(identifier, @"The identifier string cannot be nil.");
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if (block) {
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if (identifier) {
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[[self al_globalConstraintIdentifiers] addObject:identifier];
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}
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block();
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if (identifier) {
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[[self al_globalConstraintIdentifiers] removeLastObject];
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}
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}
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}
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/**
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Sets the string as the identifier for this constraint. Available in iOS 7.0 and OS X 10.9 and later.
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The identifier will be printed along with the constraint's description.
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This is helpful to document a constraint's purpose and aid in debugging.
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@param identifier A string used to identify this constraint.
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@return This constraint.
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*/
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- (instancetype)autoIdentify:(NSString *)identifier
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{
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if ([self respondsToSelector:@selector(setIdentifier:)]) {
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self.identifier = identifier;
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}
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return self;
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}
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#endif /* PL__PureLayout_MinBaseSDK_iOS_8_0 || PL__PureLayout_MinBaseSDK_OSX_10_10 */
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#pragma mark Install & Remove Constraints
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/**
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Activates the constraint.
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*/
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- (void)autoInstall
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{
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#if PL__PureLayout_MinBaseSDK_iOS_8_0 || PL__PureLayout_MinBaseSDK_OSX_10_10
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if ([self respondsToSelector:@selector(setActive:)]) {
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[NSLayoutConstraint al_applyGlobalStateToConstraint:self];
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if ([NSLayoutConstraint al_preventAutomaticConstraintInstallation]) {
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[[NSLayoutConstraint al_currentArrayOfCreatedConstraints] addObject:self];
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} else {
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self.active = YES;
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}
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return;
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}
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#endif /* PL__PureLayout_MinBaseSDK_iOS_8_0 || PL__PureLayout_MinBaseSDK_OSX_10_10 */
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NSAssert(self.firstItem || self.secondItem, @"Can't install a constraint with nil firstItem and secondItem.");
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if (self.firstItem) {
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if (self.secondItem) {
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NSAssert([self.firstItem isKindOfClass:[ALView class]] && [self.secondItem isKindOfClass:[ALView class]], @"Can only automatically install a constraint if both items are views.");
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ALView *commonSuperview = [self.firstItem al_commonSuperviewWithView:self.secondItem];
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[commonSuperview al_addConstraint:self];
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} else {
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NSAssert([self.firstItem isKindOfClass:[ALView class]], @"Can only automatically install a constraint if the item is a view.");
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[self.firstItem al_addConstraint:self];
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}
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} else {
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NSAssert([self.secondItem isKindOfClass:[ALView class]], @"Can only automatically install a constraint if the item is a view.");
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[self.secondItem al_addConstraint:self];
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}
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}
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/**
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Deactivates the constraint.
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*/
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- (void)autoRemove
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{
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#if PL__PureLayout_MinBaseSDK_iOS_8_0 || PL__PureLayout_MinBaseSDK_OSX_10_10
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if ([self respondsToSelector:@selector(setActive:)]) {
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self.active = NO;
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return;
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}
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#endif /* PL__PureLayout_MinBaseSDK_iOS_8_0 || PL__PureLayout_MinBaseSDK_OSX_10_10 */
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if (self.secondItem) {
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ALView *commonSuperview = [self.firstItem al_commonSuperviewWithView:self.secondItem];
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while (commonSuperview) {
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if ([commonSuperview.constraints containsObject:self]) {
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[commonSuperview removeConstraint:self];
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return;
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}
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commonSuperview = commonSuperview.superview;
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}
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}
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else {
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[self.firstItem removeConstraint:self];
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return;
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}
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NSAssert(nil, @"Failed to remove constraint: %@", self);
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}
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#pragma mark Internal Methods
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/**
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Applies the global constraint priority and identifier to the given constraint.
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This should be done before installing all constraints.
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@param constraint The constraint to set the global priority and identifier on.
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*/
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+ (void)al_applyGlobalStateToConstraint:(NSLayoutConstraint *)constraint
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{
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if ([NSLayoutConstraint al_isExecutingPriorityConstraintsBlock]) {
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constraint.priority = [NSLayoutConstraint al_currentGlobalConstraintPriority];
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}
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#if PL__PureLayout_MinBaseSDK_iOS_8_0 || PL__PureLayout_MinBaseSDK_OSX_10_10
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NSString *globalConstraintIdentifier = [NSLayoutConstraint al_currentGlobalConstraintIdentifier];
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if (globalConstraintIdentifier) {
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[constraint autoIdentify:globalConstraintIdentifier];
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}
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#endif /* PL__PureLayout_MinBaseSDK_iOS_8_0 || PL__PureLayout_MinBaseSDK_OSX_10_10 */
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}
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/**
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Returns the corresponding NSLayoutAttribute for the given ALAttribute.
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@return The layout attribute for the given ALAttribute.
|
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*/
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+ (NSLayoutAttribute)al_layoutAttributeForAttribute:(ALAttribute)attribute
|
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{
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NSLayoutAttribute layoutAttribute = NSLayoutAttributeNotAnAttribute;
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switch (attribute) {
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case ALEdgeLeft:
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layoutAttribute = NSLayoutAttributeLeft;
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break;
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case ALEdgeRight:
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||||
layoutAttribute = NSLayoutAttributeRight;
|
||||
break;
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||||
case ALEdgeTop:
|
||||
layoutAttribute = NSLayoutAttributeTop;
|
||||
break;
|
||||
case ALEdgeBottom:
|
||||
layoutAttribute = NSLayoutAttributeBottom;
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||||
break;
|
||||
case ALEdgeLeading:
|
||||
layoutAttribute = NSLayoutAttributeLeading;
|
||||
break;
|
||||
case ALEdgeTrailing:
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||||
layoutAttribute = NSLayoutAttributeTrailing;
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||||
break;
|
||||
case ALDimensionWidth:
|
||||
layoutAttribute = NSLayoutAttributeWidth;
|
||||
break;
|
||||
case ALDimensionHeight:
|
||||
layoutAttribute = NSLayoutAttributeHeight;
|
||||
break;
|
||||
case ALAxisVertical:
|
||||
layoutAttribute = NSLayoutAttributeCenterX;
|
||||
break;
|
||||
case ALAxisHorizontal:
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||||
layoutAttribute = NSLayoutAttributeCenterY;
|
||||
break;
|
||||
case ALAxisBaseline: // same value as ALAxisLastBaseline
|
||||
layoutAttribute = NSLayoutAttributeBaseline;
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||||
break;
|
||||
#if PL__PureLayout_MinBaseSDK_iOS_8_0
|
||||
case ALAxisFirstBaseline:
|
||||
NSAssert(PL__PureLayout_MinSysVer_iOS_8_0, @"ALAxisFirstBaseline is only supported on iOS 8.0 or higher.");
|
||||
layoutAttribute = NSLayoutAttributeFirstBaseline;
|
||||
break;
|
||||
case ALMarginLeft:
|
||||
NSAssert(PL__PureLayout_MinSysVer_iOS_8_0, @"ALEdgeLeftMargin is only supported on iOS 8.0 or higher.");
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||||
layoutAttribute = NSLayoutAttributeLeftMargin;
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||||
break;
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||||
case ALMarginRight:
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||||
NSAssert(PL__PureLayout_MinSysVer_iOS_8_0, @"ALEdgeRightMargin is only supported on iOS 8.0 or higher.");
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||||
layoutAttribute = NSLayoutAttributeRightMargin;
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||||
break;
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||||
case ALMarginTop:
|
||||
NSAssert(PL__PureLayout_MinSysVer_iOS_8_0, @"ALEdgeTopMargin is only supported on iOS 8.0 or higher.");
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||||
layoutAttribute = NSLayoutAttributeTopMargin;
|
||||
break;
|
||||
case ALMarginBottom:
|
||||
NSAssert(PL__PureLayout_MinSysVer_iOS_8_0, @"ALEdgeBottomMargin is only supported on iOS 8.0 or higher.");
|
||||
layoutAttribute = NSLayoutAttributeBottomMargin;
|
||||
break;
|
||||
case ALMarginLeading:
|
||||
NSAssert(PL__PureLayout_MinSysVer_iOS_8_0, @"ALEdgeLeadingMargin is only supported on iOS 8.0 or higher.");
|
||||
layoutAttribute = NSLayoutAttributeLeadingMargin;
|
||||
break;
|
||||
case ALMarginTrailing:
|
||||
NSAssert(PL__PureLayout_MinSysVer_iOS_8_0, @"ALEdgeTrailingMargin is only supported on iOS 8.0 or higher.");
|
||||
layoutAttribute = NSLayoutAttributeTrailingMargin;
|
||||
break;
|
||||
case ALMarginAxisVertical:
|
||||
NSAssert(PL__PureLayout_MinSysVer_iOS_8_0, @"ALAxisVerticalMargin is only supported on iOS 8.0 or higher.");
|
||||
layoutAttribute = NSLayoutAttributeCenterXWithinMargins;
|
||||
break;
|
||||
case ALMarginAxisHorizontal:
|
||||
NSAssert(PL__PureLayout_MinSysVer_iOS_8_0, @"ALAxisHorizontalMargin is only supported on iOS 8.0 or higher.");
|
||||
layoutAttribute = NSLayoutAttributeCenterYWithinMargins;
|
||||
break;
|
||||
#endif /* PL__PureLayout_MinBaseSDK_iOS_8_0 */
|
||||
default:
|
||||
NSAssert(nil, @"Not a valid ALAttribute.");
|
||||
break;
|
||||
}
|
||||
return layoutAttribute;
|
||||
}
|
||||
|
||||
/**
|
||||
Returns the corresponding ALLayoutConstraintAxis for the given ALAxis.
|
||||
|
||||
@return The constraint axis for the given axis.
|
||||
*/
|
||||
+ (ALLayoutConstraintAxis)al_constraintAxisForAxis:(ALAxis)axis
|
||||
{
|
||||
ALLayoutConstraintAxis constraintAxis;
|
||||
switch (axis) {
|
||||
case ALAxisVertical:
|
||||
constraintAxis = ALLayoutConstraintAxisVertical;
|
||||
break;
|
||||
case ALAxisHorizontal:
|
||||
case ALAxisBaseline: // same value as ALAxisLastBaseline
|
||||
#if PL__PureLayout_MinBaseSDK_iOS_8_0
|
||||
case ALAxisFirstBaseline:
|
||||
#endif /* PL__PureLayout_MinBaseSDK_iOS_8_0 */
|
||||
constraintAxis = ALLayoutConstraintAxisHorizontal;
|
||||
break;
|
||||
default:
|
||||
NSAssert(nil, @"Not a valid ALAxis.");
|
||||
constraintAxis = ALLayoutConstraintAxisHorizontal; // default to an arbitrary value to satisfy the compiler
|
||||
break;
|
||||
}
|
||||
return constraintAxis;
|
||||
}
|
||||
|
||||
#if PL__PureLayout_MinBaseSDK_iOS_8_0
|
||||
|
||||
/**
|
||||
Returns the corresponding margin for the given edge.
|
||||
|
||||
@param edge The edge to convert to the corresponding margin.
|
||||
@return The margin for the given edge.
|
||||
*/
|
||||
+ (ALMargin)al_marginForEdge:(ALEdge)edge
|
||||
{
|
||||
NSAssert(PL__PureLayout_MinSysVer_iOS_8_0, @"Margin attributes are only supported on iOS 8.0 or higher.");
|
||||
ALMargin margin;
|
||||
switch (edge) {
|
||||
case ALEdgeLeft:
|
||||
margin = ALMarginLeft;
|
||||
break;
|
||||
case ALEdgeRight:
|
||||
margin = ALMarginRight;
|
||||
break;
|
||||
case ALEdgeTop:
|
||||
margin = ALMarginTop;
|
||||
break;
|
||||
case ALEdgeBottom:
|
||||
margin = ALMarginBottom;
|
||||
break;
|
||||
case ALEdgeLeading:
|
||||
margin = ALMarginLeading;
|
||||
break;
|
||||
case ALEdgeTrailing:
|
||||
margin = ALMarginTrailing;
|
||||
break;
|
||||
default:
|
||||
NSAssert(nil, @"Not a valid ALEdge.");
|
||||
margin = ALMarginLeft; // default to an arbitrary value to satisfy the compiler
|
||||
break;
|
||||
}
|
||||
return margin;
|
||||
}
|
||||
|
||||
/**
|
||||
Returns the corresponding margin axis for the given axis.
|
||||
|
||||
@param axis The axis to convert to the corresponding margin axis.
|
||||
@return The margin axis for the given axis.
|
||||
*/
|
||||
+ (ALMarginAxis)al_marginAxisForAxis:(ALAxis)axis
|
||||
{
|
||||
NSAssert(PL__PureLayout_MinSysVer_iOS_8_0, @"Margin attributes are only supported on iOS 8.0 or higher.");
|
||||
ALMarginAxis marginAxis;
|
||||
switch (axis) {
|
||||
case ALAxisVertical:
|
||||
marginAxis = ALMarginAxisVertical;
|
||||
break;
|
||||
case ALAxisHorizontal:
|
||||
marginAxis = ALMarginAxisHorizontal;
|
||||
break;
|
||||
case ALAxisBaseline:
|
||||
case ALAxisFirstBaseline:
|
||||
NSAssert(nil, @"The baseline axis attributes do not have corresponding margin axis attributes.");
|
||||
marginAxis = ALMarginAxisVertical; // default to an arbitrary value to satisfy the compiler
|
||||
break;
|
||||
default:
|
||||
NSAssert(nil, @"Not a valid ALAxis.");
|
||||
marginAxis = ALMarginAxisVertical; // default to an arbitrary value to satisfy the compiler
|
||||
break;
|
||||
}
|
||||
return marginAxis;
|
||||
}
|
||||
|
||||
#endif /* PL__PureLayout_MinBaseSDK_iOS_8_0 */
|
||||
|
||||
@end
|
||||
Reference in New Issue
Block a user