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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/base/cocoa/cursor_accessibility_scale_factor.h"
#include <Foundation/Foundation.h>
#include <dispatch/dispatch.h>
#include <algorithm>
#include <optional>
#include "base/apple/foundation_util.h"
#include "base/command_line.h"
#include "ui/base/cursor/cursor.h"
@interface CursorAccessibilityScaleFactorNotifier ()
@property(readonly, nonatomic) float scaleFactor;
@end
@implementation CursorAccessibilityScaleFactorNotifier {
NSMutableDictionary<id<NSObject>, void (^)(void)>* _observers;
NSUserDefaults* __strong _defaults;
float _scaleFactor;
}
@synthesize scaleFactor = _scaleFactor;
+ (CursorAccessibilityScaleFactorNotifier*)sharedNotifier {
static dispatch_once_t once;
static CursorAccessibilityScaleFactorNotifier* instance;
dispatch_once(&once, ^{
instance = [[CursorAccessibilityScaleFactorNotifier alloc] init];
});
return instance;
}
- (instancetype)init {
if (self = [super init]) {
CHECK(base::CommandLine::ForCurrentProcess()
->GetSwitchValueASCII("type")
.empty());
_observers = [[NSMutableDictionary alloc] init];
_defaults =
[[NSUserDefaults alloc] initWithSuiteName:@"com.apple.universalaccess"];
[_defaults addObserver:self
forKeyPath:@"mouseDriverCursorSize"
options:NSKeyValueObservingOptionNew |
NSKeyValueObservingOptionInitial
context:nullptr];
}
return self;
}
- (void)observeValueForKeyPath:(NSString*)keyPath
ofObject:(id)object
change:(NSDictionary*)change
context:(void*)context {
// If this key is present, it will be a number from [1.0, 4.0], but it might
// not be present if it is never set, or in tests. In that case, this
// observation method will be called with NSNull, so the following code must
// handle that case.
NSNumber* defaultsValue =
base::apple::ObjCCast<NSNumber>(change[NSKeyValueChangeNewKey]);
_scaleFactor = std::clamp(defaultsValue.floatValue, 1.0f, 4.0f);
for (void (^observer)() in _observers.allValues) {
observer();
}
}
- (id<NSObject>)addObserver:(void (^)())observer {
static int sequence;
// An opaque token is required to represent the observation, something that is
// quick and easy and compares differently to other values. A wrapped
// incrementing number will do.
id<NSObject, NSCopying> token = @(++sequence);
_observers[token] = observer;
return token;
}
- (void)removeObserver:(id<NSObject>)token {
[_observers removeObjectForKey:token];
}
namespace ui {
float GetCursorAccessibilityScaleFactor() {
return CursorAccessibilityScaleFactorNotifier.sharedNotifier.scaleFactor;
}
} // namespace ui
@end
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