main.m

#import <substrate.h>
#import <UIKit/UIkit.h>
#import <SpringBoard/SBUIController.h>
#import <SpringBoard/SBApplication.h>
#import <SpringBoard/SBApplicationIcon.h>
#import <SpringBoard/SBAppSwitcherController.h>
#import <SpringBoard/SBAppSwitcherBarView.h>
#import <SpringBoard/SBIconView.h>
#import <SpringBoard/SBIconController.h>

@interface SBAppIconQuitButton : UIButton
@property(retain, nonatomic) SBApplicationIcon *appIcon;
@end

@implementation SBAppIconQuitButton
@synthesize appIcon;
@end;

UIWindow *getAppWindow() {
    UIWindow *window = nil;
    UIApplication *app = [UIApplication sharedApplication];
    NSArray *windows = [app windows];
    int i;
    for(i = 0; i < [windows count]; i++) {
        window = [windows objectAtIndex:i];
        if([window respondsToSelector:@selector(getCurrentTheme)])
            break;
    }

    if(i == [windows count])
        window = [app keyWindow];

    return window;
}

BOOL isCapable() {
    return YES;
}

BOOL isEnabled() {
    return YES;
}

BOOL getStateFast() {
    return isEnabled();
}

float getDelayTime() {
    return 0.0f;
}

void setState(BOOL Enable) {
    float isFirmware = [[[UIDevice currentDevice] systemVersion] floatValue];

    NSMutableArray *apps = [[NSMutableArray alloc] init];
    CFPropertyListRef propList = CFPreferencesCopyAppValue(CFSTR("apps"), CFSTR("jp.rono23.removebackgroundapp"));
    if (propList) {
        if (CFGetTypeID(propList) == CFArrayGetTypeID())
            for (id item in (NSArray *)propList)
                [apps addObject:item];

        CFRelease(propList);
    }
    int count = [apps count];

    SBAppSwitcherController *switchCont = [objc_getClass("SBAppSwitcherController") sharedInstance];
    SBAppSwitcherBarView  *_bottomBar;
    object_getInstanceVariable(switchCont, "_bottomBar", &_bottomBar);

    if (isFirmware >= 6.0) {
        SBIconController *iconCont = [objc_getClass("SBIconController") sharedInstance];
        SBApplication *frontApp = [[UIApplication sharedApplication] _accessibilityFrontMostApplication];
        NSString *currentAppDisplayID = [frontApp displayIdentifier];
        NSArray *identifiers = [[switchCont.model identifiers] copy];

        for (NSString *identifier in identifiers) {
            if (currentAppDisplayID == identifier)
                continue;

            if (count > 0 && [apps containsObject:identifier])
                continue;

            id icon = [_bottomBar _iconForDisplayIdentifier:identifier];
            SBIconView *iconView = [_bottomBar _iconViewForIcon:icon creatingIfNecessary:YES];
            [iconView closeBoxTapped];
        }

        if (iconCont.openFolder)
            [iconCont closeFolderAnimated:YES];

        [identifiers release];

    } else {
        SBUIController *uiCont = [objc_getClass("SBUIController") sharedInstance];
        [uiCont _toggleSwitcher];

        NSString *identifier = nil;
        NSArray *_appIcons;
        object_getInstanceVariable(_bottomBar, "_appIcons", &_appIcons);

        if (isFirmware >= 5.0) {
            NSArray *iconViews = [_appIcons copy];

            for (id iconView in iconViews) {
                SBIcon *icon;
                object_getInstanceVariable(iconView, "_icon", &icon);
                object_getInstanceVariable(icon, "_displayIdentifier", &identifier);

                if (![icon isFolderIcon] && identifier == nil)
                    continue;

                if (count > 0 && [apps containsObject:identifier])
                    continue;

                [(SBIconView *)iconView closeBoxTapped];
            }

            [uiCont dismissSwitcherAnimated:0.0];
            [iconViews release];

        } else {
            NSArray *icons = [_appIcons copy];

            for (SBApplicationIcon *icon in icons) {
                if (count > 0) {
                    if (isFirmware >= 4.1f) {
                        object_getInstanceVariable(icon, "_displayIdentifier", &identifier);
                    } else {
                        SBApplication *_app;
                        object_getInstanceVariable(icon, "_app", &_app);
                        identifier = _app.displayIdentifier;
                    }

                    if (identifier != nil && [apps containsObject:identifier])
                        continue;
                }

                if (isFirmware >= 4.1f) {
                    [switchCont iconCloseBoxTapped:icon];
                } else {
                    SBAppIconQuitButton *quitBtn = [SBAppIconQuitButton buttonWithType:UIButtonTypeCustom];
                    quitBtn.appIcon = icon;
                    [switchCont _quitButtonHit:quitBtn];
                }
            }

            [uiCont _dismissSwitcher:0.0];

            if (isFirmware >= 4.2f) {
                [uiCont createFakeSpringBoardStatusBar];
                [uiCont setFakeSpringBoardStatusBarVisible:YES];
            }

            [icons release];
        }
    }

    UIWindow *window = getAppWindow();
    if([window isKeyWindow] == YES && [window respondsToSelector:@selector(closeButtonPressed)])
        [window closeButtonPressed];

    [apps release];
}