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//
// GTMUIKit+UnitTesting.m
//
// Category for making unit testing of graphics/UI easier.
// Allows you to save a view out to a image file, and compare a view
// with a previously stored representation to make sure it hasn't changed.
//
// Copyright 2006-2008 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy
// of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
//
#import "GTMUIKit+UnitTesting.h"
#import "GTMCALayer+UnitTesting.h"
#import "GTMDefines.h"
#if !GTM_IPHONE_SDK
#error This file is for iPhone use only
#endif // GTM_IPHONE_SDK
// A view that allows you to delegate out drawing using the formal
// GTMUnitTestViewDelegate protocol above. This is useful when writing up unit
// tests for visual elements.
// Your test will often end up looking like this:
// - (void)testFoo {
// GTMAssertDrawingEqualToFile(self, CGSizeMake(200, 200), @"Foo", nil, nil);
// }
// and your testSuite will also implement the unitTestViewDrawRect method to do
// it's actual drawing. The above creates a view of size 200x200 that draws
// it's content using |self|'s unitTestViewDrawRect method and compares it to
// the contents of the file Foo.tif to make sure it's valid
@implementation GTMUnitTestView
- (id)initWithFrame:(CGRect)frame
drawer:(id<GTMUnitTestViewDrawer>)drawer
contextInfo:(void*)contextInfo{
self = [super initWithFrame:frame];
if (self != nil) {
drawer_ = [drawer retain];
contextInfo_ = contextInfo;
}
return self;
}
- (void)dealloc {
[drawer_ release];
[super dealloc];
}
- (void)drawRect:(CGRect)rect {
[drawer_ gtm_unitTestViewDrawRect:rect contextInfo:contextInfo_];
}
@end
@implementation UIView (GTMUnitTestingAdditions)
// Returns an image containing a representation of the object
// suitable for use in comparing against a master image.
// NB this means that all colors should be from "NSDevice" color space
// Does all of it's drawing with smoothfonts and antialiasing off
// to avoid issues with font smoothing settings and antialias differences
// between ppc and x86.
//
// Returns:
// an image of the object
- (CGImageRef)gtm_unitTestImage {
CALayer* layer = [self layer];
return [layer gtm_unitTestImage];
}
// Encodes the state of an object in a manner suitable for comparing
// against a master state file so we can determine whether the
// object is in a suitable state.
//
// Arguments:
// inCoder - the coder to encode our state into
- (void)gtm_unitTestEncodeState:(NSCoder*)inCoder {
[super gtm_unitTestEncodeState:inCoder];
[inCoder encodeBool:[self isHidden] forKey:@"ViewIsHidden"];
CALayer* layer = [self layer];
if (layer) {
[layer gtm_unitTestEncodeState:inCoder];
}
if ([self gtm_shouldEncodeStateForSubviews]) {
int i = 0;
for (UIView *subview in [self subviews]) {
[inCoder encodeObject:subview
forKey:[NSString stringWithFormat:@"ViewSubView %d", i]];
i++;
}
}
}
// Returns whether gtm_unitTestEncodeState should recurse into subviews
//
// Returns:
// should gtm_unitTestEncodeState pick up subview state.
- (BOOL)gtm_shouldEncodeStateForSubviews {
return YES;
}
- (BOOL)gtm_shouldEncodeStateForSublayersOfLayer:(CALayer*)layer {
return NO;
}
@end
@implementation UIImage (GTMUnitTestingAdditions)
- (CGImageRef)gtm_unitTestImage {
return [self CGImage];
}
@end
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