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//
// GTMNSWorkspace+ScreenSaver.m
//
// 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 <Carbon/Carbon.h>
#import <ScreenSaver/ScreenSaver.h>
#import "GTMNSWorkspace+ScreenSaver.h"
// Interesting class descriptions extracted from ScreenSaver.framework using
// class-dump. Note that these are "not documented".
@protocol ScreenSaverControl
- (BOOL)screenSaverIsRunning;
- (BOOL)screenSaverCanRun;
- (void)setScreenSaverCanRun:(BOOL)fp8;
- (void)screenSaverStartNow;
- (void)screenSaverStopNow;
- (void)restartForUser:(id)fp8;
- (double)screenSaverTimeRemaining;
- (void)screenSaverDidFade;
- (BOOL)screenSaverIsRunningInBackground;
- (void)screenSaverDidFadeInBackground:(BOOL)fp8
psnHi:(unsigned int)fp12
psnLow:(unsigned int)fp16;
@end
@interface ScreenSaverController : NSObject <ScreenSaverControl> {
NSConnection *_connection;
id _daemonProxy;
void *_reserved;
}
+ (id)controller;
+ (id)monitor;
+ (id)daemonConnectionName;
+ (id)enginePath;
- (void)_connectionClosed:(id)fp8;
- (id)init;
- (void)dealloc;
- (BOOL)screenSaverIsRunning;
- (BOOL)screenSaverCanRun;
- (void)setScreenSaverCanRun:(BOOL)fp8;
- (void)screenSaverStartNow;
- (void)screenSaverStopNow;
- (void)restartForUser:(id)fp8;
- (double)screenSaverTimeRemaining;
- (void)screenSaverDidFade;
- (BOOL)screenSaverIsRunningInBackground;
- (void)screenSaverDidFadeInBackground:(BOOL)fp8
psnHi:(unsigned int)fp12
psnLow:(unsigned int)fp16;
@end
// end of extraction
@implementation NSWorkspace (GTMScreenSaverAddition)
// Check if the screen saver is running.
+ (BOOL)gtm_isScreenSaverActive {
BOOL answer = NO;
ScreenSaverController *controller = nil;
// We're calling into an "undocumented" framework here, so we are going to
// step rather carefully.
Class screenSaverControllerClass = NSClassFromString(@"ScreenSaverController");
NSAssert(screenSaverControllerClass,
@"Are you linked with ScreenSaver.framework?"
" Can't find ScreenSaverController class.");
if ([screenSaverControllerClass respondsToSelector:@selector(controller)]) {
controller = [ScreenSaverController controller];
if (controller) {
if ([controller respondsToSelector:@selector(screenSaverIsRunning)]) {
answer = [controller screenSaverIsRunning];
} else {
NSLog(@"ScreenSaverController no longer supports -screenSaverIsRunning?");
}
}
}
if (!controller) {
// If we can't get the controller, chances are we are being run from the
// command line and don't have access to the window server. As such we are
// going to fallback to the older method of figuring out if a screen saver
// is running.
ProcessSerialNumber psn;
// Check if the saver is already running
require_noerr(GetFrontProcess(&psn), CantGetFrontProcess);
CFDictionaryRef cfProcessInfo
= ProcessInformationCopyDictionary(&psn,
kProcessDictionaryIncludeAllInformationMask);
require(cfProcessInfo, CantGetFrontProcessInfo);
NSString *bundlePath = [(NSDictionary*)cfProcessInfo objectForKey:@"BundlePath"];
// ScreenSaverEngine is the frontmost app if the screen saver is actually
// running Security Agent is the frontmost app if the "enter password"
// dialog is showing
answer = [bundlePath hasSuffix:@"ScreenSaverEngine.app"] ||
[bundlePath hasSuffix:@"SecurityAgent.app"];
CFRelease(cfProcessInfo);
}
CantGetFrontProcessInfo:
CantGetFrontProcess:
return answer;
}
@end
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