Initial commit
This commit is contained in:
killer
commit
0771c95a97
1
.gitattributes
vendored
Normal file
1
.gitattributes
vendored
Normal file
@ -0,0 +1 @@
|
||||
*.pbxproj -text
|
||||
46
.gitignore
vendored
Normal file
46
.gitignore
vendored
Normal file
@ -0,0 +1,46 @@
|
||||
|
||||
# OSX
|
||||
#
|
||||
.DS_Store
|
||||
|
||||
# node.js
|
||||
#
|
||||
node_modules/
|
||||
npm-debug.log
|
||||
yarn-error.log
|
||||
|
||||
|
||||
# Xcode
|
||||
#
|
||||
build/
|
||||
*.pbxuser
|
||||
!default.pbxuser
|
||||
*.mode1v3
|
||||
!default.mode1v3
|
||||
*.mode2v3
|
||||
!default.mode2v3
|
||||
*.perspectivev3
|
||||
!default.perspectivev3
|
||||
xcuserdata
|
||||
*.xccheckout
|
||||
*.moved-aside
|
||||
DerivedData
|
||||
*.hmap
|
||||
*.ipa
|
||||
*.xcuserstate
|
||||
project.xcworkspace
|
||||
|
||||
|
||||
# Android/IntelliJ
|
||||
#
|
||||
build/
|
||||
.idea
|
||||
.gradle
|
||||
local.properties
|
||||
*.iml
|
||||
|
||||
# BUCK
|
||||
buck-out/
|
||||
\.buckd/
|
||||
*.keystore
|
||||
|
||||
21
LICENSE
Normal file
21
LICENSE
Normal file
@ -0,0 +1,21 @@
|
||||
MIT License
|
||||
|
||||
Copyright (c) 2021 killer
|
||||
|
||||
Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
of this software and associated documentation files (the "Software"), to deal
|
||||
in the Software without restriction, including without limitation the rights
|
||||
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
copies of the Software, and to permit persons to whom the Software is
|
||||
furnished to do so, subject to the following conditions:
|
||||
|
||||
The above copyright notice and this permission notice shall be included in all
|
||||
copies or substantial portions of the Software.
|
||||
|
||||
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
||||
SOFTWARE.
|
||||
45
README.md
Normal file
45
README.md
Normal file
@ -0,0 +1,45 @@
|
||||
|
||||
# react-native-prevent-screenshoter
|
||||
|
||||
## Getting started
|
||||
|
||||
`$ npm install react-native-prevent-screenshoter --save`
|
||||
|
||||
### Mostly automatic installation
|
||||
|
||||
`$ react-native link react-native-prevent-screenshoter`
|
||||
|
||||
### Manual installation
|
||||
|
||||
|
||||
#### iOS
|
||||
|
||||
1. In XCode, in the project navigator, right click `Libraries` ➜ `Add Files to [your project's name]`
|
||||
2. Go to `node_modules` ➜ `react-native-prevent-screenshoter` and add `RNPreventScreenshot.xcodeproj`
|
||||
3. In XCode, in the project navigator, select your project. Add `libRNPreventScreenshot.a` to your project's `Build Phases` ➜ `Link Binary With Libraries`
|
||||
4. Run your project (`Cmd+R`)<
|
||||
|
||||
#### Android
|
||||
|
||||
1. Open up `android/app/src/main/java/[...]/MainActivity.java`
|
||||
- Add `import com.killserver.RNPreventScreenshotPackage;` to the imports at the top of the file
|
||||
- Add `new RNPreventScreenshotPackage()` to the list returned by the `getPackages()` method
|
||||
2. Append the following lines to `android/settings.gradle`:
|
||||
```
|
||||
include ':react-native-prevent-screenshoter'
|
||||
project(':react-native-prevent-screenshoter').projectDir = new File(rootProject.projectDir, '../node_modules/react-native-prevent-screenshoter/android')
|
||||
```
|
||||
3. Insert the following lines inside the dependencies block in `android/app/build.gradle`:
|
||||
```
|
||||
compile project(':react-native-prevent-screenshoter')
|
||||
```
|
||||
|
||||
|
||||
|
||||
## Usage
|
||||
```javascript
|
||||
import RNPreventScreenshot from 'react-native-prevent-screenshoter';
|
||||
|
||||
RNPreventScreenshot.enabled(true/false);
|
||||
```
|
||||
|
||||
36
android/build.gradle
Normal file
36
android/build.gradle
Normal file
@ -0,0 +1,36 @@
|
||||
|
||||
buildscript {
|
||||
repositories {
|
||||
jcenter()
|
||||
}
|
||||
|
||||
dependencies {
|
||||
classpath 'com.android.tools.build:gradle:1.3.1'
|
||||
}
|
||||
}
|
||||
|
||||
apply plugin: 'com.android.library'
|
||||
|
||||
android {
|
||||
compileSdkVersion 23
|
||||
buildToolsVersion "23.0.1"
|
||||
|
||||
defaultConfig {
|
||||
minSdkVersion 16
|
||||
targetSdkVersion 22
|
||||
versionCode 1
|
||||
versionName "1.0"
|
||||
}
|
||||
lintOptions {
|
||||
abortOnError false
|
||||
}
|
||||
}
|
||||
|
||||
repositories {
|
||||
mavenCentral()
|
||||
}
|
||||
|
||||
dependencies {
|
||||
compile 'com.facebook.react:react-native:+'
|
||||
}
|
||||
|
||||
6
android/src/main/AndroidManifest.xml
Normal file
6
android/src/main/AndroidManifest.xml
Normal file
@ -0,0 +1,6 @@
|
||||
|
||||
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
|
||||
package="com.killserver.screenshoter">
|
||||
|
||||
</manifest>
|
||||
|
||||
@ -0,0 +1,44 @@
|
||||
|
||||
package com.killserver.screenshoter;
|
||||
|
||||
import android.view.WindowManager;
|
||||
|
||||
import com.facebook.react.bridge.ReactApplicationContext;
|
||||
import com.facebook.react.bridge.ReactContextBaseJavaModule;
|
||||
import com.facebook.react.bridge.ReactMethod;
|
||||
import com.facebook.react.bridge.Callback;
|
||||
|
||||
public class RNPreventScreenshotModule extends ReactContextBaseJavaModule {
|
||||
|
||||
private final ReactApplicationContext reactContext;
|
||||
|
||||
public RNPreventScreenshotModule(ReactApplicationContext reactContext) {
|
||||
super(reactContext);
|
||||
this.reactContext = reactContext;
|
||||
}
|
||||
|
||||
@Override
|
||||
public String getName() {
|
||||
return "RNPreventScreenshot";
|
||||
}
|
||||
|
||||
@ReactMethod
|
||||
public void enabled(boolean _enable) {
|
||||
if (_enable) {
|
||||
this.reactContext.getCurrentActivity().runOnUiThread(new Runnable() {
|
||||
@override
|
||||
public void run() {
|
||||
reactContext.getCurrentActivity().getWindow().setFlags(WindowManager.LayoutParams.FLAG_SECURE, WindowManager.LayoutParams.FLAG_SECURE);
|
||||
}
|
||||
});
|
||||
} else {
|
||||
this.reactContext.getCurrentActivity().runOnUiThread(new Runnable() {
|
||||
@override
|
||||
public void run() {
|
||||
reactContext.getCurrentActivity().getWindow().clearFlags(WindowManager.LayoutParams.FLAG_SECURE);
|
||||
}
|
||||
});
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
@ -0,0 +1,28 @@
|
||||
|
||||
package com.killserver.screenshoter;
|
||||
|
||||
import java.util.Arrays;
|
||||
import java.util.Collections;
|
||||
import java.util.List;
|
||||
|
||||
import com.facebook.react.ReactPackage;
|
||||
import com.facebook.react.bridge.NativeModule;
|
||||
import com.facebook.react.bridge.ReactApplicationContext;
|
||||
import com.facebook.react.uimanager.ViewManager;
|
||||
import com.facebook.react.bridge.JavaScriptModule;
|
||||
public class RNPreventScreenshotPackage implements ReactPackage {
|
||||
@Override
|
||||
public List<NativeModule> createNativeModules(ReactApplicationContext reactContext) {
|
||||
return Arrays.<NativeModule>asList(new RNPreventScreenshotModule(reactContext));
|
||||
}
|
||||
|
||||
// Deprecated from RN 0.47
|
||||
public List<Class<? extends JavaScriptModule>> createJSModules() {
|
||||
return Collections.emptyList();
|
||||
}
|
||||
|
||||
@Override
|
||||
public List<ViewManager> createViewManagers(ReactApplicationContext reactContext) {
|
||||
return Collections.emptyList();
|
||||
}
|
||||
}
|
||||
5
index.d.ts
vendored
Normal file
5
index.d.ts
vendored
Normal file
@ -0,0 +1,5 @@
|
||||
declare module 'react-native-screenshot-prevent' {
|
||||
export type RNPreventScreenshot = {
|
||||
enabled: (value: boolean) => void
|
||||
}
|
||||
}
|
||||
6
index.js
Normal file
6
index.js
Normal file
@ -0,0 +1,6 @@
|
||||
|
||||
import { NativeModules } from 'react-native';
|
||||
|
||||
const { RNPreventScreenshot } = NativeModules;
|
||||
|
||||
export default RNPreventScreenshot;
|
||||
11
ios/RNPreventScreenshot.h
Normal file
11
ios/RNPreventScreenshot.h
Normal file
@ -0,0 +1,11 @@
|
||||
|
||||
#if __has_include("RCTBridgeModule.h")
|
||||
#import "RCTBridgeModule.h"
|
||||
#else
|
||||
#import <React/RCTBridgeModule.h>
|
||||
#endif
|
||||
|
||||
@interface RNPreventScreenshot : NSObject <RCTBridgeModule>
|
||||
|
||||
@end
|
||||
|
||||
73
ios/RNPreventScreenshot.m
Normal file
73
ios/RNPreventScreenshot.m
Normal file
@ -0,0 +1,73 @@
|
||||
|
||||
#import "RNPreventScreenshot.h"
|
||||
#import "UIImage+ImageEffects.h"
|
||||
|
||||
@implementation RNPreventScreenshot {
|
||||
BOOL enabled;
|
||||
UIImageView *obfuscatingView;
|
||||
}
|
||||
|
||||
- (dispatch_queue_t)methodQueue
|
||||
{
|
||||
return dispatch_get_main_queue();
|
||||
}
|
||||
RCT_EXPORT_MODULE();
|
||||
|
||||
#pragma mark - Lifecycle
|
||||
|
||||
- (instancetype)init {
|
||||
if ((self = [super init])) {
|
||||
[[NSNotificationCenter defaultCenter] addObserver:self
|
||||
selector:@selector(handleAppStateResignActive)
|
||||
name:UIApplicationWillResignActiveNotification
|
||||
object:nil];
|
||||
[[NSNotificationCenter defaultCenter] addObserver:self
|
||||
selector:@selector(handleAppStateActive)
|
||||
name:UIApplicationDidBecomeActiveNotification
|
||||
object:nil];
|
||||
}
|
||||
return self;
|
||||
}
|
||||
|
||||
#pragma mark - App Notification Methods
|
||||
|
||||
- (void)handleAppStateResignActive {
|
||||
if (self->enabled) {
|
||||
UIWindow *keyWindow = [UIApplication sharedApplication].keyWindow;
|
||||
UIImageView *blurredScreenImageView = [[UIImageView alloc] initWithFrame:keyWindow.bounds];
|
||||
|
||||
UIGraphicsBeginImageContext(keyWindow.bounds.size);
|
||||
[keyWindow drawViewHierarchyInRect:keyWindow.frame afterScreenUpdates:NO];
|
||||
UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
|
||||
UIGraphicsEndImageContext();
|
||||
|
||||
blurredScreenImageView.image = [viewImage applyLightEffect];
|
||||
|
||||
self->obfuscatingView = blurredScreenImageView;
|
||||
[[UIApplication sharedApplication].keyWindow addSubview:self->obfuscatingView];
|
||||
|
||||
}
|
||||
}
|
||||
|
||||
- (void)handleAppStateActive {
|
||||
if (self->obfuscatingView) {
|
||||
[UIView animateWithDuration: 0.3
|
||||
animations: ^ {
|
||||
self->obfuscatingView.alpha = 0;
|
||||
}
|
||||
completion: ^(BOOL finished) {
|
||||
[self->obfuscatingView removeFromSuperview];
|
||||
self->obfuscatingView = nil;
|
||||
}
|
||||
];
|
||||
}
|
||||
}
|
||||
|
||||
#pragma mark - Public API
|
||||
|
||||
RCT_EXPORT_METHOD(enabled:(BOOL) _enable) {
|
||||
self->enabled = _enable;
|
||||
}
|
||||
|
||||
|
||||
@end
|
||||
24
ios/RNPreventScreenshot.podspec
Normal file
24
ios/RNPreventScreenshot.podspec
Normal file
@ -0,0 +1,24 @@
|
||||
|
||||
Pod::Spec.new do |s|
|
||||
s.name = "RNPreventScreenshot"
|
||||
s.version = "1.0.0"
|
||||
s.summary = "RNPreventScreenshot"
|
||||
s.description = <<-DESC
|
||||
RNPreventScreenshot
|
||||
DESC
|
||||
s.homepage = ""
|
||||
s.license = "MIT"
|
||||
# s.license = { :type => "MIT", :file => "FILE_LICENSE" }
|
||||
s.author = { "author" => "author@domain.cn" }
|
||||
s.platform = :ios, "7.0"
|
||||
s.source = { :git => "https://github.com/author/RNPreventScreenshot.git", :tag => "master" }
|
||||
s.source_files = "RNPreventScreenshot/**/*.{h,m}"
|
||||
s.requires_arc = true
|
||||
|
||||
|
||||
s.dependency "React"
|
||||
#s.dependency "others"
|
||||
|
||||
end
|
||||
|
||||
|
||||
266
ios/RNPreventScreenshot.xcodeproj/project.pbxproj
Normal file
266
ios/RNPreventScreenshot.xcodeproj/project.pbxproj
Normal file
@ -0,0 +1,266 @@
|
||||
// !$*UTF8*$!
|
||||
{
|
||||
archiveVersion = 1;
|
||||
classes = {
|
||||
};
|
||||
objectVersion = 46;
|
||||
objects = {
|
||||
|
||||
/* Begin PBXBuildFile section */
|
||||
B3E7B58A1CC2AC0600A0062D /* RNPreventScreenshot.m in Sources */ = {isa = PBXBuildFile; fileRef = B3E7B5891CC2AC0600A0062D /* RNPreventScreenshot.m */; };
|
||||
F7D96EE223047BB300BC2484 /* UIImage+ImageEffects.m in Sources */ = {isa = PBXBuildFile; fileRef = F7D96EE123047BB300BC2484 /* UIImage+ImageEffects.m */; };
|
||||
/* End PBXBuildFile section */
|
||||
|
||||
/* Begin PBXCopyFilesBuildPhase section */
|
||||
58B511D91A9E6C8500147676 /* CopyFiles */ = {
|
||||
isa = PBXCopyFilesBuildPhase;
|
||||
buildActionMask = 2147483647;
|
||||
dstPath = "include/$(PRODUCT_NAME)";
|
||||
dstSubfolderSpec = 16;
|
||||
files = (
|
||||
);
|
||||
runOnlyForDeploymentPostprocessing = 0;
|
||||
};
|
||||
/* End PBXCopyFilesBuildPhase section */
|
||||
|
||||
/* Begin PBXFileReference section */
|
||||
134814201AA4EA6300B7C361 /* libRNPreventScreenshot.a */ = {isa = PBXFileReference; explicitFileType = archive.ar; includeInIndex = 0; path = libRNPreventScreenshot.a; sourceTree = BUILT_PRODUCTS_DIR; };
|
||||
B3E7B5881CC2AC0600A0062D /* RNPreventScreenshot.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = RNPreventScreenshot.h; sourceTree = "<group>"; };
|
||||
B3E7B5891CC2AC0600A0062D /* RNPreventScreenshot.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = RNPreventScreenshot.m; sourceTree = "<group>"; };
|
||||
F7D96EE023047BB300BC2484 /* UIImage+ImageEffects.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = "UIImage+ImageEffects.h"; sourceTree = "<group>"; };
|
||||
F7D96EE123047BB300BC2484 /* UIImage+ImageEffects.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = "UIImage+ImageEffects.m"; sourceTree = "<group>"; };
|
||||
/* End PBXFileReference section */
|
||||
|
||||
/* Begin PBXFrameworksBuildPhase section */
|
||||
58B511D81A9E6C8500147676 /* Frameworks */ = {
|
||||
isa = PBXFrameworksBuildPhase;
|
||||
buildActionMask = 2147483647;
|
||||
files = (
|
||||
);
|
||||
runOnlyForDeploymentPostprocessing = 0;
|
||||
};
|
||||
/* End PBXFrameworksBuildPhase section */
|
||||
|
||||
/* Begin PBXGroup section */
|
||||
134814211AA4EA7D00B7C361 /* Products */ = {
|
||||
isa = PBXGroup;
|
||||
children = (
|
||||
134814201AA4EA6300B7C361 /* libRNPreventScreenshot.a */,
|
||||
);
|
||||
name = Products;
|
||||
sourceTree = "<group>";
|
||||
};
|
||||
58B511D21A9E6C8500147676 = {
|
||||
isa = PBXGroup;
|
||||
children = (
|
||||
F7D96EE023047BB300BC2484 /* UIImage+ImageEffects.h */,
|
||||
F7D96EE123047BB300BC2484 /* UIImage+ImageEffects.m */,
|
||||
B3E7B5881CC2AC0600A0062D /* RNPreventScreenshot.h */,
|
||||
B3E7B5891CC2AC0600A0062D /* RNPreventScreenshot.m */,
|
||||
134814211AA4EA7D00B7C361 /* Products */,
|
||||
);
|
||||
sourceTree = "<group>";
|
||||
};
|
||||
/* End PBXGroup section */
|
||||
|
||||
/* Begin PBXNativeTarget section */
|
||||
58B511DA1A9E6C8500147676 /* RNPreventScreenshot */ = {
|
||||
isa = PBXNativeTarget;
|
||||
buildConfigurationList = 58B511EF1A9E6C8500147676 /* Build configuration list for PBXNativeTarget "RNPreventScreenshot" */;
|
||||
buildPhases = (
|
||||
58B511D71A9E6C8500147676 /* Sources */,
|
||||
58B511D81A9E6C8500147676 /* Frameworks */,
|
||||
58B511D91A9E6C8500147676 /* CopyFiles */,
|
||||
);
|
||||
buildRules = (
|
||||
);
|
||||
dependencies = (
|
||||
);
|
||||
name = RNPreventScreenshot;
|
||||
productName = RCTDataManager;
|
||||
productReference = 134814201AA4EA6300B7C361 /* libRNPreventScreenshot.a */;
|
||||
productType = "com.apple.product-type.library.static";
|
||||
};
|
||||
/* End PBXNativeTarget section */
|
||||
|
||||
/* Begin PBXProject section */
|
||||
58B511D31A9E6C8500147676 /* Project object */ = {
|
||||
isa = PBXProject;
|
||||
attributes = {
|
||||
LastUpgradeCheck = 0830;
|
||||
ORGANIZATIONNAME = Facebook;
|
||||
TargetAttributes = {
|
||||
58B511DA1A9E6C8500147676 = {
|
||||
CreatedOnToolsVersion = 6.1.1;
|
||||
};
|
||||
};
|
||||
};
|
||||
buildConfigurationList = 58B511D61A9E6C8500147676 /* Build configuration list for PBXProject "RNPreventScreenshot" */;
|
||||
compatibilityVersion = "Xcode 3.2";
|
||||
developmentRegion = English;
|
||||
hasScannedForEncodings = 0;
|
||||
knownRegions = (
|
||||
English,
|
||||
en,
|
||||
);
|
||||
mainGroup = 58B511D21A9E6C8500147676;
|
||||
productRefGroup = 58B511D21A9E6C8500147676;
|
||||
projectDirPath = "";
|
||||
projectRoot = "";
|
||||
targets = (
|
||||
58B511DA1A9E6C8500147676 /* RNPreventScreenshot */,
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112
ios/UIImage+ImageEffects.h
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112
ios/UIImage+ImageEffects.h
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||||
/*
|
||||
File: UIImage+ImageEffects.h
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||||
Abstract: This is a category of UIImage that adds methods to apply blur and tint effects to an image. This is the code you’ll want to look out to find out how to use vImage to efficiently calculate a blur.
|
||||
Version: 1.0
|
||||
|
||||
Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple
|
||||
Inc. ("Apple") in consideration of your agreement to the following
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||||
terms, and your use, installation, modification or redistribution of
|
||||
this Apple software constitutes acceptance of these terms. If you do
|
||||
not agree with these terms, please do not use, install, modify or
|
||||
redistribute this Apple software.
|
||||
|
||||
In consideration of your agreement to abide by the following terms, and
|
||||
subject to these terms, Apple grants you a personal, non-exclusive
|
||||
license, under Apple's copyrights in this original Apple software (the
|
||||
"Apple Software"), to use, reproduce, modify and redistribute the Apple
|
||||
Software, with or without modifications, in source and/or binary forms;
|
||||
provided that if you redistribute the Apple Software in its entirety and
|
||||
without modifications, you must retain this notice and the following
|
||||
text and disclaimers in all such redistributions of the Apple Software.
|
||||
Neither the name, trademarks, service marks or logos of Apple Inc. may
|
||||
be used to endorse or promote products derived from the Apple Software
|
||||
without specific prior written permission from Apple. Except as
|
||||
expressly stated in this notice, no other rights or licenses, express or
|
||||
implied, are granted by Apple herein, including but not limited to any
|
||||
patent rights that may be infringed by your derivative works or by other
|
||||
works in which the Apple Software may be incorporated.
|
||||
|
||||
The Apple Software is provided by Apple on an "AS IS" basis. APPLE
|
||||
MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
|
||||
THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS
|
||||
FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND
|
||||
OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.
|
||||
|
||||
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||||
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INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION,
|
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MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED
|
||||
AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE),
|
||||
STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE
|
||||
POSSIBILITY OF SUCH DAMAGE.
|
||||
|
||||
Copyright (C) 2013 Apple Inc. All Rights Reserved.
|
||||
|
||||
|
||||
Copyright © 2013 Apple Inc. All rights reserved.
|
||||
WWDC 2013 License
|
||||
|
||||
NOTE: This Apple Software was supplied by Apple as part of a WWDC 2013
|
||||
Session. Please refer to the applicable WWDC 2013 Session for further
|
||||
information.
|
||||
|
||||
IMPORTANT: This Apple software is supplied to you by Apple Inc.
|
||||
("Apple") in consideration of your agreement to the following terms, and
|
||||
your use, installation, modification or redistribution of this Apple
|
||||
software constitutes acceptance of these terms. If you do not agree with
|
||||
these terms, please do not use, install, modify or redistribute this
|
||||
Apple software.
|
||||
|
||||
In consideration of your agreement to abide by the following terms, and
|
||||
subject to these terms, Apple grants you a non-exclusive license, under
|
||||
Apple's copyrights in this original Apple software (the "Apple
|
||||
Software"), to use, reproduce, modify and redistribute the Apple
|
||||
Software, with or without modifications, in source and/or binary forms;
|
||||
provided that if you redistribute the Apple Software in its entirety and
|
||||
without modifications, you must retain this notice and the following
|
||||
text and disclaimers in all such redistributions of the Apple Software.
|
||||
Neither the name, trademarks, service marks or logos of Apple Inc. may
|
||||
be used to endorse or promote products derived from the Apple Software
|
||||
without specific prior written permission from Apple. Except as
|
||||
expressly stated in this notice, no other rights or licenses, express or
|
||||
implied, are granted by Apple herein, including but not limited to any
|
||||
patent rights that may be infringed by your derivative works or by other
|
||||
works in which the Apple Software may be incorporated.
|
||||
|
||||
The Apple Software is provided by Apple on an "AS IS" basis. APPLE MAKES
|
||||
NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE
|
||||
IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR
|
||||
A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND
|
||||
OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.
|
||||
|
||||
IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL
|
||||
OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
||||
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
||||
INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION,
|
||||
MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED
|
||||
AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE),
|
||||
STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE
|
||||
POSSIBILITY OF SUCH DAMAGE.
|
||||
|
||||
EA1002
|
||||
5/3/2013
|
||||
*/
|
||||
|
||||
@import UIKit;
|
||||
|
||||
@interface UIImage (ImageEffects)
|
||||
|
||||
- (UIImage *)applyLightEffect;
|
||||
- (UIImage *)applyExtraLightEffect;
|
||||
- (UIImage *)applyDarkEffect;
|
||||
- (UIImage *)applyTintEffectWithColor:(UIColor *)tintColor;
|
||||
|
||||
- (UIImage *)applyBlurWithRadius:(CGFloat)blurRadius tintColor:(UIColor *)tintColor saturationDeltaFactor:(CGFloat)saturationDeltaFactor maskImage:(UIImage *)maskImage;
|
||||
|
||||
- (UIImage *)rotateByDegrees:(CGFloat)degrees;
|
||||
|
||||
+ (UIImage *)imagePixelFromColor:(UIColor *)color;
|
||||
+ (UIImage *)imageFromColor:(UIColor *)color withSize:(CGSize)size;
|
||||
|
||||
@end
|
||||
310
ios/UIImage+ImageEffects.m
Normal file
310
ios/UIImage+ImageEffects.m
Normal file
@ -0,0 +1,310 @@
|
||||
/*
|
||||
File: UIImage+ImageEffects.m
|
||||
Abstract: This is a category of UIImage that adds methods to apply blur and tint effects to an image. This is the code you’ll want to look out to find out how to use vImage to efficiently calculate a blur.
|
||||
Version: 1.0
|
||||
|
||||
Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple
|
||||
Inc. ("Apple") in consideration of your agreement to the following
|
||||
terms, and your use, installation, modification or redistribution of
|
||||
this Apple software constitutes acceptance of these terms. If you do
|
||||
not agree with these terms, please do not use, install, modify or
|
||||
redistribute this Apple software.
|
||||
|
||||
In consideration of your agreement to abide by the following terms, and
|
||||
subject to these terms, Apple grants you a personal, non-exclusive
|
||||
license, under Apple's copyrights in this original Apple software (the
|
||||
"Apple Software"), to use, reproduce, modify and redistribute the Apple
|
||||
Software, with or without modifications, in source and/or binary forms;
|
||||
provided that if you redistribute the Apple Software in its entirety and
|
||||
without modifications, you must retain this notice and the following
|
||||
text and disclaimers in all such redistributions of the Apple Software.
|
||||
Neither the name, trademarks, service marks or logos of Apple Inc. may
|
||||
be used to endorse or promote products derived from the Apple Software
|
||||
without specific prior written permission from Apple. Except as
|
||||
expressly stated in this notice, no other rights or licenses, express or
|
||||
implied, are granted by Apple herein, including but not limited to any
|
||||
patent rights that may be infringed by your derivative works or by other
|
||||
works in which the Apple Software may be incorporated.
|
||||
|
||||
The Apple Software is provided by Apple on an "AS IS" basis. APPLE
|
||||
MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
|
||||
THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS
|
||||
FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND
|
||||
OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.
|
||||
|
||||
IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL
|
||||
OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
||||
INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION,
|
||||
MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED
|
||||
AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE),
|
||||
STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE
|
||||
POSSIBILITY OF SUCH DAMAGE.
|
||||
|
||||
Copyright (C) 2013 Apple Inc. All Rights Reserved.
|
||||
|
||||
|
||||
Copyright © 2013 Apple Inc. All rights reserved.
|
||||
WWDC 2013 License
|
||||
|
||||
NOTE: This Apple Software was supplied by Apple as part of a WWDC 2013
|
||||
Session. Please refer to the applicable WWDC 2013 Session for further
|
||||
information.
|
||||
|
||||
IMPORTANT: This Apple software is supplied to you by Apple Inc.
|
||||
("Apple") in consideration of your agreement to the following terms, and
|
||||
your use, installation, modification or redistribution of this Apple
|
||||
software constitutes acceptance of these terms. If you do not agree with
|
||||
these terms, please do not use, install, modify or redistribute this
|
||||
Apple software.
|
||||
|
||||
In consideration of your agreement to abide by the following terms, and
|
||||
subject to these terms, Apple grants you a non-exclusive license, under
|
||||
Apple's copyrights in this original Apple software (the "Apple
|
||||
Software"), to use, reproduce, modify and redistribute the Apple
|
||||
Software, with or without modifications, in source and/or binary forms;
|
||||
provided that if you redistribute the Apple Software in its entirety and
|
||||
without modifications, you must retain this notice and the following
|
||||
text and disclaimers in all such redistributions of the Apple Software.
|
||||
Neither the name, trademarks, service marks or logos of Apple Inc. may
|
||||
be used to endorse or promote products derived from the Apple Software
|
||||
without specific prior written permission from Apple. Except as
|
||||
expressly stated in this notice, no other rights or licenses, express or
|
||||
implied, are granted by Apple herein, including but not limited to any
|
||||
patent rights that may be infringed by your derivative works or by other
|
||||
works in which the Apple Software may be incorporated.
|
||||
|
||||
The Apple Software is provided by Apple on an "AS IS" basis. APPLE MAKES
|
||||
NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE
|
||||
IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR
|
||||
A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND
|
||||
OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.
|
||||
|
||||
IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL
|
||||
OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
||||
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
||||
INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION,
|
||||
MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED
|
||||
AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE),
|
||||
STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE
|
||||
POSSIBILITY OF SUCH DAMAGE.
|
||||
|
||||
EA1002
|
||||
5/3/2013
|
||||
*/
|
||||
|
||||
#import "UIImage+ImageEffects.h"
|
||||
|
||||
@import Accelerate;
|
||||
#import <float.h>
|
||||
|
||||
|
||||
@implementation UIImage (ImageEffects)
|
||||
|
||||
|
||||
- (UIImage *)applyLightEffect
|
||||
{
|
||||
UIColor *tintColor = [UIColor colorWithWhite:1.0 alpha:0.3];
|
||||
return [self applyBlurWithRadius:30 tintColor:tintColor saturationDeltaFactor:1.8 maskImage:nil];
|
||||
}
|
||||
|
||||
|
||||
- (UIImage *)applyExtraLightEffect
|
||||
{
|
||||
UIColor *tintColor = [UIColor colorWithWhite:0.97 alpha:0.82];
|
||||
return [self applyBlurWithRadius:20 tintColor:tintColor saturationDeltaFactor:1.8 maskImage:nil];
|
||||
}
|
||||
|
||||
|
||||
- (UIImage *)applyDarkEffect
|
||||
{
|
||||
UIColor *tintColor = [UIColor colorWithWhite:0.11 alpha:0.73];
|
||||
return [self applyBlurWithRadius:20 tintColor:tintColor saturationDeltaFactor:1.8 maskImage:nil];
|
||||
}
|
||||
|
||||
|
||||
- (UIImage *)applyTintEffectWithColor:(UIColor *)tintColor
|
||||
{
|
||||
const CGFloat EffectColorAlpha = 0.6;
|
||||
UIColor *effectColor = tintColor;
|
||||
int componentCount = CGColorGetNumberOfComponents(tintColor.CGColor);
|
||||
if (componentCount == 2) {
|
||||
CGFloat b;
|
||||
if ([tintColor getWhite:&b alpha:NULL]) {
|
||||
effectColor = [UIColor colorWithWhite:b alpha:EffectColorAlpha];
|
||||
}
|
||||
}
|
||||
else {
|
||||
CGFloat r, g, b;
|
||||
if ([tintColor getRed:&r green:&g blue:&b alpha:NULL]) {
|
||||
effectColor = [UIColor colorWithRed:r green:g blue:b alpha:EffectColorAlpha];
|
||||
}
|
||||
}
|
||||
return [self applyBlurWithRadius:10 tintColor:effectColor saturationDeltaFactor:-1.0 maskImage:nil];
|
||||
}
|
||||
|
||||
|
||||
- (UIImage *)applyBlurWithRadius:(CGFloat)blurRadius tintColor:(UIColor *)tintColor saturationDeltaFactor:(CGFloat)saturationDeltaFactor maskImage:(UIImage *)maskImage
|
||||
{
|
||||
// Check pre-conditions.
|
||||
if (self.size.width < 1 || self.size.height < 1) {
|
||||
NSLog (@"*** error: invalid size: (%.2f x %.2f). Both dimensions must be >= 1: %@", self.size.width, self.size.height, self);
|
||||
return nil;
|
||||
}
|
||||
if (!self.CGImage) {
|
||||
NSLog (@"*** error: image must be backed by a CGImage: %@", self);
|
||||
return nil;
|
||||
}
|
||||
if (maskImage && !maskImage.CGImage) {
|
||||
NSLog (@"*** error: maskImage must be backed by a CGImage: %@", maskImage);
|
||||
return nil;
|
||||
}
|
||||
|
||||
CGRect imageRect = { CGPointZero, self.size };
|
||||
UIImage *effectImage = self;
|
||||
|
||||
BOOL hasBlur = blurRadius > __FLT_EPSILON__;
|
||||
BOOL hasSaturationChange = fabs(saturationDeltaFactor - 1.) > __FLT_EPSILON__;
|
||||
if (hasBlur || hasSaturationChange) {
|
||||
UIGraphicsBeginImageContextWithOptions(self.size, NO, [[UIScreen mainScreen] scale]);
|
||||
CGContextRef effectInContext = UIGraphicsGetCurrentContext();
|
||||
CGContextScaleCTM(effectInContext, 1.0, -1.0);
|
||||
CGContextTranslateCTM(effectInContext, 0, -self.size.height);
|
||||
CGContextDrawImage(effectInContext, imageRect, self.CGImage);
|
||||
|
||||
vImage_Buffer effectInBuffer;
|
||||
effectInBuffer.data = CGBitmapContextGetData(effectInContext);
|
||||
effectInBuffer.width = CGBitmapContextGetWidth(effectInContext);
|
||||
effectInBuffer.height = CGBitmapContextGetHeight(effectInContext);
|
||||
effectInBuffer.rowBytes = CGBitmapContextGetBytesPerRow(effectInContext);
|
||||
|
||||
UIGraphicsBeginImageContextWithOptions(self.size, NO, [[UIScreen mainScreen] scale]);
|
||||
CGContextRef effectOutContext = UIGraphicsGetCurrentContext();
|
||||
vImage_Buffer effectOutBuffer;
|
||||
effectOutBuffer.data = CGBitmapContextGetData(effectOutContext);
|
||||
effectOutBuffer.width = CGBitmapContextGetWidth(effectOutContext);
|
||||
effectOutBuffer.height = CGBitmapContextGetHeight(effectOutContext);
|
||||
effectOutBuffer.rowBytes = CGBitmapContextGetBytesPerRow(effectOutContext);
|
||||
|
||||
if (hasBlur) {
|
||||
// A description of how to compute the box kernel width from the Gaussian
|
||||
// radius (aka standard deviation) appears in the SVG spec:
|
||||
// http://www.w3.org/TR/SVG/filters.html#feGaussianBlurElement
|
||||
//
|
||||
// For larger values of 's' (s >= 2.0), an approximation can be used: Three
|
||||
// successive box-blurs build a piece-wise quadratic convolution kernel, which
|
||||
// approximates the Gaussian kernel to within roughly 3%.
|
||||
//
|
||||
// let d = floor(s * 3*sqrt(2*pi)/4 + 0.5)
|
||||
//
|
||||
// ... if d is odd, use three box-blurs of size 'd', centered on the output pixel.
|
||||
//
|
||||
CGFloat inputRadius = blurRadius * [[UIScreen mainScreen] scale];
|
||||
NSUInteger radius = floor(inputRadius * 3. * sqrt(2 * M_PI) / 4 + 0.5);
|
||||
if (radius % 2 != 1) {
|
||||
radius += 1; // force radius to be odd so that the three box-blur methodology works.
|
||||
}
|
||||
vImageBoxConvolve_ARGB8888(&effectInBuffer, &effectOutBuffer, NULL, 0, 0, radius, radius, 0, kvImageEdgeExtend);
|
||||
vImageBoxConvolve_ARGB8888(&effectOutBuffer, &effectInBuffer, NULL, 0, 0, radius, radius, 0, kvImageEdgeExtend);
|
||||
vImageBoxConvolve_ARGB8888(&effectInBuffer, &effectOutBuffer, NULL, 0, 0, radius, radius, 0, kvImageEdgeExtend);
|
||||
}
|
||||
BOOL effectImageBuffersAreSwapped = NO;
|
||||
if (hasSaturationChange) {
|
||||
CGFloat s = saturationDeltaFactor;
|
||||
CGFloat floatingPointSaturationMatrix[] = {
|
||||
0.0722 + 0.9278 * s, 0.0722 - 0.0722 * s, 0.0722 - 0.0722 * s, 0,
|
||||
0.7152 - 0.7152 * s, 0.7152 + 0.2848 * s, 0.7152 - 0.7152 * s, 0,
|
||||
0.2126 - 0.2126 * s, 0.2126 - 0.2126 * s, 0.2126 + 0.7873 * s, 0,
|
||||
0, 0, 0, 1,
|
||||
};
|
||||
const int32_t divisor = 256;
|
||||
NSUInteger matrixSize = sizeof(floatingPointSaturationMatrix)/sizeof(floatingPointSaturationMatrix[0]);
|
||||
int16_t saturationMatrix[matrixSize];
|
||||
for (NSUInteger i = 0; i < matrixSize; ++i) {
|
||||
saturationMatrix[i] = (int16_t)roundf(floatingPointSaturationMatrix[i] * divisor);
|
||||
}
|
||||
if (hasBlur) {
|
||||
vImageMatrixMultiply_ARGB8888(&effectOutBuffer, &effectInBuffer, saturationMatrix, divisor, NULL, NULL, kvImageNoFlags);
|
||||
effectImageBuffersAreSwapped = YES;
|
||||
}
|
||||
else {
|
||||
vImageMatrixMultiply_ARGB8888(&effectInBuffer, &effectOutBuffer, saturationMatrix, divisor, NULL, NULL, kvImageNoFlags);
|
||||
}
|
||||
}
|
||||
if (!effectImageBuffersAreSwapped)
|
||||
effectImage = UIGraphicsGetImageFromCurrentImageContext();
|
||||
UIGraphicsEndImageContext();
|
||||
|
||||
if (effectImageBuffersAreSwapped)
|
||||
effectImage = UIGraphicsGetImageFromCurrentImageContext();
|
||||
UIGraphicsEndImageContext();
|
||||
}
|
||||
|
||||
// Set up output context.
|
||||
UIGraphicsBeginImageContextWithOptions(self.size, NO, [[UIScreen mainScreen] scale]);
|
||||
CGContextRef outputContext = UIGraphicsGetCurrentContext();
|
||||
CGContextScaleCTM(outputContext, 1.0, -1.0);
|
||||
CGContextTranslateCTM(outputContext, 0, -self.size.height);
|
||||
|
||||
// Draw base image.
|
||||
CGContextDrawImage(outputContext, imageRect, self.CGImage);
|
||||
|
||||
// Draw effect image.
|
||||
if (hasBlur) {
|
||||
CGContextSaveGState(outputContext);
|
||||
if (maskImage) {
|
||||
CGContextClipToMask(outputContext, imageRect, maskImage.CGImage);
|
||||
}
|
||||
CGContextDrawImage(outputContext, imageRect, effectImage.CGImage);
|
||||
CGContextRestoreGState(outputContext);
|
||||
}
|
||||
|
||||
// Add in color tint.
|
||||
if (tintColor) {
|
||||
CGContextSaveGState(outputContext);
|
||||
CGContextSetFillColorWithColor(outputContext, tintColor.CGColor);
|
||||
CGContextFillRect(outputContext, imageRect);
|
||||
CGContextRestoreGState(outputContext);
|
||||
}
|
||||
|
||||
// Output image is ready.
|
||||
UIImage *outputImage = UIGraphicsGetImageFromCurrentImageContext();
|
||||
UIGraphicsEndImageContext();
|
||||
|
||||
return outputImage;
|
||||
}
|
||||
|
||||
- (UIImage *)rotateByDegrees:(CGFloat)degrees {
|
||||
UIView *rotatedViewBox = [[UIView alloc] initWithFrame:CGRectMake(0, 0, self.size.width, self.size.height)];
|
||||
CGAffineTransform t = CGAffineTransformMakeRotation(degrees * M_PI / 180.0f);
|
||||
rotatedViewBox.transform = t;
|
||||
CGSize rotatedSize = rotatedViewBox.frame.size;
|
||||
|
||||
UIGraphicsBeginImageContext(rotatedSize);
|
||||
CGContextRef bitmap = UIGraphicsGetCurrentContext();
|
||||
CGContextTranslateCTM(bitmap, rotatedSize.width/2, rotatedSize.height/2);
|
||||
CGContextRotateCTM(bitmap, degrees * M_PI / 180.0f);
|
||||
CGContextScaleCTM(bitmap, 1.0, -1.0);
|
||||
CGContextDrawImage(bitmap, CGRectMake(-self.size.width / 2, -self.size.height / 2, self.size.width, self.size.height), self.CGImage);
|
||||
|
||||
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
|
||||
UIGraphicsEndImageContext();
|
||||
return newImage;
|
||||
}
|
||||
|
||||
+ (UIImage *)imagePixelFromColor:(UIColor *)color {
|
||||
return [UIImage imageFromColor:color withSize:CGSizeMake(1.0f, 1.0f)];
|
||||
}
|
||||
|
||||
+ (UIImage *)imageFromColor:(UIColor *)color withSize:(CGSize)size {
|
||||
CGRect rect = CGRectMake(0.0f, 0.0f, size.width, size.height);
|
||||
UIGraphicsBeginImageContext(rect.size);
|
||||
CGContextRef context = UIGraphicsGetCurrentContext();
|
||||
CGContextSetFillColorWithColor(context, [color CGColor]);
|
||||
CGContextFillRect(context, rect);
|
||||
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
|
||||
UIGraphicsEndImageContext();
|
||||
return image;
|
||||
}
|
||||
|
||||
@end
|
||||
5
package-lock.json
generated
Normal file
5
package-lock.json
generated
Normal file
@ -0,0 +1,5 @@
|
||||
{
|
||||
"name": "react-native-prevent-screenshot",
|
||||
"version": "1.0.0",
|
||||
"lockfileVersion": 1
|
||||
}
|
||||
26
package.json
Normal file
26
package.json
Normal file
@ -0,0 +1,26 @@
|
||||
{
|
||||
"name": "react-native-screenshot-prevent",
|
||||
"version": "1.0.0",
|
||||
"description": "## Getting started",
|
||||
"main": "index.js",
|
||||
"types": "index.d.ts",
|
||||
"scripts": {
|
||||
"test": "echo \"Error: no test specified\" && exit 1"
|
||||
},
|
||||
"keywords": [
|
||||
"react-native"
|
||||
],
|
||||
"author": "killserver",
|
||||
"license": "MIT",
|
||||
"peerDependencies": {
|
||||
"react-native": "^0.41.2"
|
||||
},
|
||||
"repository": {
|
||||
"type": "git",
|
||||
"url": "git+https://github.com/killserver/react-native-screenshot-prevent.git"
|
||||
},
|
||||
"bugs": {
|
||||
"url": "https://github.com/killserver/react-native-screenshot-prevent/issues"
|
||||
},
|
||||
"homepage": "https://github.com/killserver/react-native-screenshot-prevent#readme"
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user