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[cydia.git] / CyteKit / WebViewController.mm

#include "CyteKit/UCPlatform.h"
#include "CyteKit/WebViewController.h"

#include "CyteKit/MFMailComposeViewController-MailToURL.h"

#include "iPhonePrivate.h"

#include "CyteKit/Localize.h"
#include "CyteKit/WebViewController.h"
#include "CyteKit/PerlCompatibleRegEx.hpp"
#include "CyteKit/WebThreadLocked.hpp"

//#include <QuartzCore/CALayer.h>
// XXX: fix the minimum requirement
extern NSString * const kCAFilterNearest;

#include <WebCore/WebCoreThread.h>

#include <WebKit/WebKitErrors.h>
#include <WebKit/WebPreferences.h>

#include <WebKit/DOMCSSPrimitiveValue.h>
#include <WebKit/DOMCSSStyleDeclaration.h>
#include <WebKit/DOMDocument.h>
#include <WebKit/DOMHTMLBodyElement.h>
#include <WebKit/DOMRGBColor.h>

#include <dlfcn.h>
#include <objc/runtime.h>

#define ForSaurik 0
#define DefaultTimeout_ 120.0

#define ShowInternals 0
#define LogBrowser 0
#define LogMessages 0

#define lprintf(args...) fprintf(stderr, args)

// XXX: centralize these special class things to some file or mechanism?
static Class $MFMailComposeViewController;

float CYScrollViewDecelerationRateNormal;

@interface WebView (Apple)
- (void) _setLayoutInterval:(float)interval;
- (void) _setAllowsMessaging:(BOOL)allows;
@end

@interface WebPreferences (Apple)
+ (void) _setInitialDefaultTextEncodingToSystemEncoding;
- (void) _setLayoutInterval:(NSInteger)interval;
- (void) setOfflineWebApplicationCacheEnabled:(BOOL)enabled;
@end

/* Indirect Delegate {{{ */
@interface IndirectDelegate : NSObject {
    _transient volatile id delegate_;
}

- (void) setDelegate:(id)delegate;
- (id) initWithDelegate:(id)delegate;
@end

@implementation IndirectDelegate

- (void) setDelegate:(id)delegate {
    delegate_ = delegate;
}

- (id) initWithDelegate:(id)delegate {
    delegate_ = delegate;
    return self;
}

- (IMP) methodForSelector:(SEL)sel {
    if (IMP method = [super methodForSelector:sel])
        return method;
    fprintf(stderr, "methodForSelector:[%s] == NULL\n", sel_getName(sel));
    return NULL;
}

- (BOOL) respondsToSelector:(SEL)sel {
    if ([super respondsToSelector:sel])
        return YES;

    // XXX: WebThreadCreateNSInvocation returns nil

#if ShowInternals
    fprintf(stderr, "[%s]R?%s\n", class_getName(self->isa), sel_getName(sel));
#endif

    return delegate_ == nil ? NO : [delegate_ respondsToSelector:sel];
}

- (NSMethodSignature *) methodSignatureForSelector:(SEL)sel {
    if (NSMethodSignature *method = [super methodSignatureForSelector:sel])
        return method;

#if ShowInternals
    fprintf(stderr, "[%s]S?%s\n", class_getName(self->isa), sel_getName(sel));
#endif

    if (delegate_ != nil)
        if (NSMethodSignature *sig = [delegate_ methodSignatureForSelector:sel])
            return sig;

    // XXX: I fucking hate Apple so very very bad
    return [NSMethodSignature signatureWithObjCTypes:"v@:"];
}

- (void) forwardInvocation:(NSInvocation *)inv {
    SEL sel = [inv selector];
    if (delegate_ != nil && [delegate_ respondsToSelector:sel])
        [inv invokeWithTarget:delegate_];
}

@end
/* }}} */

@implementation CyteWebViewController

#if ShowInternals
#include "CyteKit/UCInternal.h"
#endif

+ (void) _initialize {
    [WebPreferences _setInitialDefaultTextEncodingToSystemEncoding];

    dlopen("/System/Library/Frameworks/MessageUI.framework/MessageUI", RTLD_GLOBAL | RTLD_LAZY);
    $MFMailComposeViewController = objc_getClass("MFMailComposeViewController");

    if (float *_UIScrollViewDecelerationRateNormal = reinterpret_cast<float *>(dlsym(RTLD_DEFAULT, "UIScrollViewDecelerationRateNormal")))
        CYScrollViewDecelerationRateNormal = *_UIScrollViewDecelerationRateNormal;
    else // XXX: this actually might be fast on some older systems: we should look into this
        CYScrollViewDecelerationRateNormal = 0.998;
}

- (void) dealloc {
#if LogBrowser
    NSLog(@"[CyteWebViewController dealloc]");
#endif

    if ([loading_ count] != 0)
        [delegate_ releaseNetworkActivityIndicator];

    [super dealloc];
}

- (NSURL *) URLWithURL:(NSURL *)url {
    return url;
}

- (NSURLRequest *) requestWithURL:(NSURL *)url cachePolicy:(NSURLRequestCachePolicy)policy {
    return [NSURLRequest
        requestWithURL:[self URLWithURL:url]
        cachePolicy:policy
        timeoutInterval:DefaultTimeout_
    ];
}

- (void) setURL:(NSURL *)url {
    _assert(request_ == nil);
    request_ = [self requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy];
}

- (void) loadURL:(NSURL *)url cachePolicy:(NSURLRequestCachePolicy)policy {
    [self loadRequest:[self requestWithURL:url cachePolicy:policy]];
}

- (void) loadURL:(NSURL *)url {
    [self loadURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy];
}

- (void) loadRequest:(NSURLRequest *)request {
#if LogBrowser
    NSLog(@"loadRequest:%@", request);
#endif

    error_ = false;

    WebThreadLocked lock;
    [webview_ loadRequest:request];
}

- (void) reloadURLWithCache:(BOOL)cache {
    if (request_ == nil)
        return;

    NSMutableURLRequest *request([request_ mutableCopy]);
    [request setCachePolicy:(cache ? NSURLRequestUseProtocolCachePolicy : NSURLRequestReloadIgnoringLocalCacheData)];

    request_ = request;

    if ([request_ HTTPBody] == nil && [request_ HTTPBodyStream] == nil)
        [self loadRequest:request_];
    else {
        UIAlertView *alert = [[[UIAlertView alloc]
            initWithTitle:UCLocalize("RESUBMIT_FORM")
            message:nil
            delegate:self
            cancelButtonTitle:UCLocalize("CANCEL")
            otherButtonTitles:
                UCLocalize("SUBMIT"),
            nil
        ] autorelease];

        [alert setContext:@"submit"];
        [alert show];
    }
}

- (void) reloadURL {
    [self reloadURLWithCache:YES];
}

- (void) reloadData {
    [super reloadData];
    [self reloadURLWithCache:YES];
}

- (void) setButtonImage:(NSString *)button withStyle:(NSString *)style toFunction:(id)function {
    custom_ = button;
    style_ = style;
    function_ = function;

    [self performSelectorOnMainThread:@selector(applyRightButton) withObject:nil waitUntilDone:NO];
}

- (void) setButtonTitle:(NSString *)button withStyle:(NSString *)style toFunction:(id)function {
    custom_ = button;
    style_ = style;
    function_ = function;

    [self performSelectorOnMainThread:@selector(applyRightButton) withObject:nil waitUntilDone:NO];
}

- (void) removeButton {
    custom_ = [NSNull null];
    [self performSelectorOnMainThread:@selector(applyRightButton) withObject:nil waitUntilDone:NO];
}

- (void) scrollToBottomAnimated:(NSNumber *)animated {
    CGSize size([scroller_ contentSize]);
    CGPoint offset([scroller_ contentOffset]);
    CGRect frame([scroller_ frame]);

    if (size.height - offset.y < frame.size.height + 20.f) {
        CGRect rect = {{0, size.height-1}, {size.width, 1}};
        [scroller_ scrollRectToVisible:rect animated:[animated boolValue]];
    }
}

- (void) _setViewportWidth {
    [[webview_ _documentView] setViewportSize:CGSizeMake(width_, UIWebViewGrowsAndShrinksToFitHeight) forDocumentTypes:0x10];
}

- (void) setViewportWidth:(float)width {
    width_ = width != 0 ? width : [[self class] defaultWidth];
    [self _setViewportWidth];
}

- (void) _setViewportWidthOnMainThread:(NSNumber *)width {
    [self setViewportWidth:[width floatValue]];
}

- (void) setViewportWidthOnMainThread:(float)width {
    [self performSelectorOnMainThread:@selector(_setViewportWidthOnMainThread:) withObject:[NSNumber numberWithFloat:width] waitUntilDone:NO];
}

- (void) webViewUpdateViewSettings:(UIWebView *)view {
    [self _setViewportWidth];
}

- (void) mailComposeController:(MFMailComposeViewController*)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError*)error {
    [self dismissModalViewControllerAnimated:YES];
}

- (void) _openMailToURL:(NSURL *)url {
    if ($MFMailComposeViewController != nil && [$MFMailComposeViewController canSendMail]) {
        MFMailComposeViewController *controller([[[$MFMailComposeViewController alloc] init] autorelease]);
        [controller setMailComposeDelegate:self];

        [controller setMailToURL:url];

        [self presentModalViewController:controller animated:YES];
        return;
    }

    UIApplication *app([UIApplication sharedApplication]);
    if ([app respondsToSelector:@selector(openURL:asPanel:)])
        [app openURL:url asPanel:YES];
    else
        [app openURL:url];
}

- (bool) _allowJavaScriptPanel {
    return true;
}

- (bool) allowsNavigationAction {
    return allowsNavigationAction_;
}

- (void) setAllowsNavigationAction:(bool)value {
    allowsNavigationAction_ = value;
}

- (void) setAllowsNavigationActionByNumber:(NSNumber *)value {
    [self setAllowsNavigationAction:[value boolValue]];
}

- (void) popViewControllerWithNumber:(NSNumber *)value {
    UINavigationController *navigation([self navigationController]);
    if ([navigation topViewController] == self)
        [navigation popViewControllerAnimated:[value boolValue]];
}

- (void) _didFailWithError:(NSError *)error forFrame:(WebFrame *)frame {
    [loading_ removeObject:[NSValue valueWithNonretainedObject:frame]];
    [self _didFinishLoading];

    if ([[error domain] isEqualToString:NSURLErrorDomain] && [error code] == NSURLErrorCancelled)
        return;

    if ([[error domain] isEqualToString:WebKitErrorDomain] && [error code] == WebKitErrorFrameLoadInterruptedByPolicyChange) {
        request_ = stage2_;
        stage1_ = nil;
        stage2_ = nil;
        return;
    }

    if ([frame parentFrame] == nil) {
        [self loadURL:[NSURL URLWithString:[NSString stringWithFormat:@"%@?%@",
            [[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"error" ofType:@"html"]] absoluteString],
            [[error localizedDescription] stringByAddingPercentEscapes]
        ]]];

        error_ = true;
    }
}

- (void) pushRequest:(NSURLRequest *)request asPop:(bool)pop {
    NSURL *url([request URL]);

    // XXX: filter to internal usage?
    CyteViewController *page([delegate_ pageForURL:url forExternal:NO]);

    if (page == nil) {
        CyteWebViewController *browser([[[class_ alloc] init] autorelease]);
        [browser loadRequest:request];
        page = browser;
    }

    [page setDelegate:delegate_];

    if (!pop) {
        [[self navigationItem] setTitle:title_];

        [[self navigationController] pushViewController:page animated:YES];
    } else {
        UINavigationController *navigation([[[UINavigationController alloc] initWithRootViewController:page] autorelease]);

        [navigation setDelegate:delegate_];

        [[page navigationItem] setLeftBarButtonItem:[[[UIBarButtonItem alloc]
            initWithTitle:UCLocalize("CLOSE")
            style:UIBarButtonItemStylePlain
            target:page
            action:@selector(close)
        ] autorelease]];

        [delegate_ unloadData];

        [[self navigationController] presentModalViewController:navigation animated:YES];
    }
}

// CyteWebViewDelegate {{{
- (void) webView:(WebView *)view addMessageToConsole:(NSDictionary *)message {
#if LogMessages
    static Pcre irritating("^(?"
        ":" "The page at .* displayed insecure content from .*\\."
        "|" "Unsafe JavaScript attempt to access frame with URL .* from frame with URL .*\\. Domains, protocols and ports must match\\."
    ")\\n$");

    if (NSString *data = [message objectForKey:@"message"])
        if (irritating(data))
            return;

    NSLog(@"addMessageToConsole:%@", message);
#endif
}

- (void) webView:(WebView *)view decidePolicyForNavigationAction:(NSDictionary *)action request:(NSURLRequest *)request frame:(WebFrame *)frame decisionListener:(id<WebPolicyDecisionListener>)listener {
#if LogBrowser
    NSLog(@"decidePolicyForNavigationAction:%@ request:%@ frame:%@", action, request, frame);
#endif

    if ([frame parentFrame] == nil) {
        if (!error_) {
            NSURL *url(request == nil ? nil : [request URL]);

            if (request_ != nil && ![[request_ URL] isEqual:url] && ![self allowsNavigationAction]) {
                if (url != nil)
                    [self pushRequest:request asPop:NO];
                [listener ignore];
            }
        }
    }
}

- (void) webView:(WebView *)view didDecidePolicy:(CYWebPolicyDecision)decision forNavigationAction:(NSDictionary *)action request:(NSURLRequest *)request frame:(WebFrame *)frame {
    if ([frame parentFrame] == nil)
        if (decision == CYWebPolicyDecisionUse)
            if (!error_) {
                stage1_ = request_;
                request_ = request;
            }
}

- (void) webView:(WebView *)view decidePolicyForNewWindowAction:(NSDictionary *)action request:(NSURLRequest *)request newFrameName:(NSString *)frame decisionListener:(id<WebPolicyDecisionListener>)listener {
#if LogBrowser
    NSLog(@"decidePolicyForNewWindowAction:%@ request:%@ newFrameName:%@", action, request, frame);
#endif

    NSURL *url([request URL]);
    if (url == nil)
        return;

    if ([frame isEqualToString:@"_open"])
        [delegate_ openURL:url];
    else {
        NSString *scheme([[url scheme] lowercaseString]);
        if ([scheme isEqualToString:@"mailto"])
            [self _openMailToURL:url];
        else
            [self pushRequest:request asPop:[frame isEqualToString:@"_popup"]];
    }

    [listener ignore];
}

- (void) webView:(WebView *)view didClearWindowObject:(WebScriptObject *)window forFrame:(WebFrame *)frame {
}

- (void) webView:(WebView *)view didFailLoadWithError:(NSError *)error forFrame:(WebFrame *)frame {
#if LogBrowser
    NSLog(@"didFailLoadWithError:%@ forFrame:%@", error, frame);
#endif

    [self _didFailWithError:error forFrame:frame];
}

- (void) webView:(WebView *)view didFailProvisionalLoadWithError:(NSError *)error forFrame:(WebFrame *)frame {
#if LogBrowser
    NSLog(@"didFailProvisionalLoadWithError:%@ forFrame:%@", error, frame);
#endif

    [self _didFailWithError:error forFrame:frame];
}

- (void) webView:(WebView *)view didFinishLoadForFrame:(WebFrame *)frame {
    [loading_ removeObject:[NSValue valueWithNonretainedObject:frame]];

    if ([frame parentFrame] == nil) {
        stage1_ = nil;
        stage2_ = nil;

        if (DOMDocument *document = [frame DOMDocument])
            if (DOMNodeList<NSFastEnumeration> *bodies = [document getElementsByTagName:@"body"])
                for (DOMHTMLBodyElement *body in (id) bodies) {
                    DOMCSSStyleDeclaration *style([document getComputedStyle:body pseudoElement:nil]);

                    UIColor *uic(nil);

                    if (DOMCSSPrimitiveValue *color = static_cast<DOMCSSPrimitiveValue *>([style getPropertyCSSValue:@"background-color"])) {
                        if ([color primitiveType] == DOM_CSS_RGBCOLOR) {
                            DOMRGBColor *rgb([color getRGBColorValue]);

                            float red([[rgb red] getFloatValue:DOM_CSS_NUMBER]);
                            float green([[rgb green] getFloatValue:DOM_CSS_NUMBER]);
                            float blue([[rgb blue] getFloatValue:DOM_CSS_NUMBER]);
                            float alpha([[rgb alpha] getFloatValue:DOM_CSS_NUMBER]);

                            if (red == 0xc7 && green == 0xce && blue == 0xd5)
                                uic = [UIColor pinStripeColor];
                            else if (alpha != 0)
                                uic = [UIColor
                                    colorWithRed:(red / 255)
                                    green:(green / 255)
                                    blue:(blue / 255)
                                    alpha:alpha
                                ];
                        }
                    }

                    [scroller_ setBackgroundColor:(uic ?: [UIColor clearColor])];
                    break;
                }
    }

    [self _didFinishLoading];
}

- (void) webView:(WebView *)view didReceiveTitle:(NSString *)title forFrame:(WebFrame *)frame {
    if ([frame parentFrame] != nil)
        return;

    title_ = title;

    [[self navigationItem] setTitle:title_];
}

- (void) webView:(WebView *)view didStartProvisionalLoadForFrame:(WebFrame *)frame {
#if LogBrowser
    NSLog(@"didStartProvisionalLoadForFrame:%@", frame);
#endif

    [loading_ addObject:[NSValue valueWithNonretainedObject:frame]];

    if ([frame parentFrame] == nil) {
        title_ = nil;
        custom_ = nil;
        style_ = nil;
        function_ = nil;

        allowsNavigationAction_ = true;

        stage2_ = stage1_;
        stage1_ = nil;

        [self setHidesNavigationBar:NO];

        // XXX: do we still need to do this?
        [[self navigationItem] setTitle:nil];
    }

    [self _didStartLoading];
}

- (NSURLRequest *) webView:(WebView *)view resource:(id)identifier willSendRequest:(NSURLRequest *)request redirectResponse:(NSURLResponse *)response fromDataSource:(WebDataSource *)source {
#if LogBrowser
    NSLog(@"resource:%@ willSendRequest:%@ redirectResponse:%@ fromDataSource:%@", identifier, request, response, source);
#endif

    return request;
}

- (bool) webView:(WebView *)view shouldRunJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(WebFrame *)frame {
    return [self _allowJavaScriptPanel];
}

- (bool) webView:(WebView *)view shouldRunJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(WebFrame *)frame {
    return [self _allowJavaScriptPanel];
}

- (bool) webView:(WebView *)view shouldRunJavaScriptTextInputPanelWithPrompt:(NSString *)prompt defaultText:(NSString *)text initiatedByFrame:(WebFrame *)frame {
    return [self _allowJavaScriptPanel];
}

- (void) webViewClose:(WebView *)view {
    [self close];
}
// }}}

- (void) close {
    [[self navigationController] dismissModalViewControllerAnimated:YES];
}

- (void) alertView:(UIAlertView *)alert clickedButtonAtIndex:(NSInteger)button {
    NSString *context([alert context]);

    if ([context isEqualToString:@"sensitive"]) {
        switch (button) {
            case 1:
                sensitive_ = [NSNumber numberWithBool:YES];
            break;

            case 2:
                sensitive_ = [NSNumber numberWithBool:NO];
            break;
        }

        [alert dismissWithClickedButtonIndex:-1 animated:YES];
    } else if ([context isEqualToString:@"challenge"]) {
        id<NSURLAuthenticationChallengeSender> sender([challenge_ sender]);

        switch (button) {
            case 1: {
                NSString *username([[alert textFieldAtIndex:0] text]);
                NSString *password([[alert textFieldAtIndex:1] text]);

                NSURLCredential *credential([NSURLCredential credentialWithUser:username password:password persistence:NSURLCredentialPersistenceForSession]);

                [sender useCredential:credential forAuthenticationChallenge:challenge_];
            } break;

            case 2:
                [sender cancelAuthenticationChallenge:challenge_];
            break;

            _nodefault
        }

        challenge_ = nil;

        [alert dismissWithClickedButtonIndex:-1 animated:YES];
    } else if ([context isEqualToString:@"submit"]) {
        if (button == [alert cancelButtonIndex]) {
        } else if (button == [alert firstOtherButtonIndex]) {
            if (request_ != nil) {
                WebThreadLocked lock;
                [webview_ loadRequest:request_];
            }
        }

        [alert dismissWithClickedButtonIndex:-1 animated:YES];
    }
}

- (UIBarButtonItemStyle) rightButtonStyle {
    if (style_ == nil) normal:
        return UIBarButtonItemStylePlain;
    else if ([style_ isEqualToString:@"Normal"])
        return UIBarButtonItemStylePlain;
    else if ([style_ isEqualToString:@"Highlighted"])
        return UIBarButtonItemStyleDone;
    else goto normal;
}

- (UIBarButtonItem *) customButton {
    if (custom_ == nil)
        return nil;
    else if (custom_ == [NSNull null])
        return (UIBarButtonItem *) [NSNull null];

    return [[[UIBarButtonItem alloc]
        initWithTitle:static_cast<NSString *>(custom_.operator NSObject *())
        style:[self rightButtonStyle]
        target:self
        action:@selector(customButtonClicked)
    ] autorelease];
}

- (UIBarButtonItem *) leftButton {
    UINavigationItem *item([self navigationItem]);
    if ([item backBarButtonItem] != nil && ![item hidesBackButton])
        return nil;

    if (UINavigationController *navigation = [self navigationController])
        if ([[navigation parentViewController] modalViewController] == navigation)
            return [[[UIBarButtonItem alloc]
                initWithTitle:UCLocalize("CLOSE")
                style:UIBarButtonItemStylePlain
                target:self
                action:@selector(close)
            ] autorelease];

    return nil;
}

- (void) applyLeftButton {
    [[self navigationItem] setLeftBarButtonItem:[self leftButton]];
}

- (UIBarButtonItem *) rightButton {
    return reloaditem_;
}

- (void) applyLoadingTitle {
    [[self navigationItem] setTitle:UCLocalize("LOADING")];
}

- (void) layoutRightButton {
    [[loadingitem_ view] addSubview:indicator_];
    [[loadingitem_ view] bringSubviewToFront:indicator_];
}

- (void) applyRightButton {
    if ([self isLoading]) {
        [[self navigationItem] setRightBarButtonItem:loadingitem_ animated:YES];
        [self performSelector:@selector(layoutRightButton) withObject:nil afterDelay:0];

        [indicator_ startAnimating];
        [self applyLoadingTitle];
    } else {
        [indicator_ stopAnimating];

        UIBarButtonItem *button([self customButton]);
        if (button == nil)
            button = [self rightButton];
        else if (button == (UIBarButtonItem *) [NSNull null])
            button = nil;

        [[self navigationItem] setRightBarButtonItem:button];
    }
}

- (void) didStartLoading {
    // Overridden in subclasses.
}

- (void) _didStartLoading {
    [self applyRightButton];

    if ([loading_ count] != 1)
        return;

    [delegate_ retainNetworkActivityIndicator];
    [self didStartLoading];
}

- (void) didFinishLoading {
    // Overridden in subclasses.
}

- (void) _didFinishLoading {
    if ([loading_ count] != 0)
        return;

    [self applyRightButton];
    [[self navigationItem] setTitle:title_];

    [delegate_ releaseNetworkActivityIndicator];
    [self didFinishLoading];
}

- (bool) isLoading {
    return [loading_ count] != 0;
}

- (id) initWithWidth:(float)width ofClass:(Class)_class {
    if ((self = [super init]) != nil) {
        allowsNavigationAction_ = true;

        class_ = _class;
        loading_ = [NSMutableSet setWithCapacity:5];

        indirect_ = [[[IndirectDelegate alloc] initWithDelegate:self] autorelease];

        CGRect bounds([[self view] bounds]);

        webview_ = [[[CyteWebView alloc] initWithFrame:bounds] autorelease];
        [webview_ setDelegate:self];
        [self setView:webview_];

        if ([webview_ respondsToSelector:@selector(setDataDetectorTypes:)])
            [webview_ setDataDetectorTypes:UIDataDetectorTypeAutomatic];
        else
            [webview_ setDetectsPhoneNumbers:NO];

        [webview_ setScalesPageToFit:YES];

        UIWebDocumentView *document([webview_ _documentView]);

        // XXX: I think this improves scrolling; the hardcoded-ness sucks
        [document setTileSize:CGSizeMake(320, 500)];

        [document setBackgroundColor:[UIColor clearColor]];

        // XXX: this is terribly (too?) expensive
        [document setDrawsBackground:NO];

        WebView *webview([document webView]);
        WebPreferences *preferences([webview preferences]);

        // XXX: I have no clue if I actually /want/ this modification
        if ([webview respondsToSelector:@selector(_setLayoutInterval:)])
            [webview _setLayoutInterval:0];
        else if ([preferences respondsToSelector:@selector(_setLayoutInterval:)])
            [preferences _setLayoutInterval:0];

        [preferences setCacheModel:WebCacheModelDocumentBrowser];
        [preferences setJavaScriptCanOpenWindowsAutomatically:YES];
        [preferences setOfflineWebApplicationCacheEnabled:YES];

#if LogMessages
        if ([document respondsToSelector:@selector(setAllowsMessaging:)])
            [document setAllowsMessaging:YES];
        if ([webview respondsToSelector:@selector(_setAllowsMessaging:)])
            [webview _setAllowsMessaging:YES];
#endif

        if ([webview_ respondsToSelector:@selector(_scrollView)]) {
            scroller_ = [webview_ _scrollView];

            [scroller_ setDirectionalLockEnabled:YES];
            [scroller_ setDecelerationRate:CYScrollViewDecelerationRateNormal];
            [scroller_ setDelaysContentTouches:NO];

            [scroller_ setCanCancelContentTouches:YES];
        } else if ([webview_ respondsToSelector:@selector(_scroller)]) {
            UIScroller *scroller([webview_ _scroller]);
            scroller_ = (UIScrollView *) scroller;

            [scroller setDirectionalScrolling:YES];
            // XXX: we might be better off /not/ setting this on older systems
            [scroller setScrollDecelerationFactor:CYScrollViewDecelerationRateNormal]; /* 0.989324 */
            [scroller setScrollHysteresis:0]; /* 8 */

            [scroller setThumbDetectionEnabled:NO];

            // use NO with UIApplicationUseLegacyEvents(YES)
            [scroller setEventMode:YES];

            // XXX: this is handled by setBounces, right?
            //[scroller setAllowsRubberBanding:YES];
        }

        [scroller_ setFixedBackgroundPattern:YES];
        [scroller_ setBackgroundColor:[UIColor clearColor]];
        [scroller_ setClipsSubviews:YES];

        [scroller_ setBounces:YES];
        [scroller_ setScrollingEnabled:YES];
        [scroller_ setShowBackgroundShadow:NO];

        [self setViewportWidth:width];

        reloaditem_ = [[[UIBarButtonItem alloc]
            initWithTitle:UCLocalize("RELOAD")
            style:[self rightButtonStyle]
            target:self
            action:@selector(reloadButtonClicked)
        ] autorelease];

        loadingitem_ = [[[UIBarButtonItem alloc]
            initWithTitle:@" "
            style:UIBarButtonItemStylePlain
            target:self
            action:@selector(reloadButtonClicked)
        ] autorelease];

        indicator_ = [[[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhite] autorelease];
        [indicator_ setFrame:CGRectMake(15, 5, [indicator_ frame].size.width, [indicator_ frame].size.height)];

        UITableView *table([[[UITableView alloc] initWithFrame:bounds style:UITableViewStyleGrouped] autorelease]);
        [webview_ insertSubview:table atIndex:0];

        [self applyLeftButton];
        [self applyRightButton];

        [table setAutoresizingMask:(UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight)];
        [webview_ setAutoresizingMask:(UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight)];
        [indicator_ setAutoresizingMask:UIViewAutoresizingFlexibleLeftMargin];
    } return self;
}

- (id) initWithWidth:(float)width {
    return [self initWithWidth:width ofClass:[self class]];
}

- (id) init {
    return [self initWithWidth:0];
}

- (id) initWithURL:(NSURL *)url {
    if ((self = [self init]) != nil) {
        [self setURL:url];
    } return self;
}

- (void) callFunction:(WebScriptObject *)function {
    WebThreadLocked lock;

    WebView *webview([[webview_ _documentView] webView]);
    WebFrame *frame([webview mainFrame]);

    JSGlobalContextRef context([frame globalContext]);
    JSObjectRef object([function JSObject]);
    JSObjectCallAsFunction(context, object, NULL, 0, NULL, NULL);
}

- (void) reloadButtonClicked {
    [self reloadURLWithCache:YES];
}

- (void) _customButtonClicked {
    [self reloadButtonClicked];
}

- (void) customButtonClicked {
#if !AlwaysReload
    if (function_ != nil)
        [self callFunction:function_];
    else
#endif
    [self _customButtonClicked];
}

+ (float) defaultWidth {
    return 980;
}

- (void) setNavigationBarStyle:(NSString *)name {
    UIBarStyle style;
    if ([name isEqualToString:@"Black"])
        style = UIBarStyleBlack;
    else
        style = UIBarStyleDefault;

    [[[self navigationController] navigationBar] setBarStyle:style];
}

- (void) setNavigationBarTintColor:(UIColor *)color {
    [[[self navigationController] navigationBar] setTintColor:color];
}

- (void) setBadgeValue:(id)value {
    [[[self navigationController] tabBarItem] setBadgeValue:value];
}

- (void) setHidesBackButton:(bool)value {
    [[self navigationItem] setHidesBackButton:value];
    [self applyLeftButton];
}

- (void) setHidesBackButtonByNumber:(NSNumber *)value {
    [self setHidesBackButton:[value boolValue]];
}

- (void) dispatchEvent:(NSString *)event {
    [(CyteWebView *) webview_ dispatchEvent:event];
}

- (bool) hidesNavigationBar {
    return hidesNavigationBar_;
}

- (void) _setHidesNavigationBar:(bool)value animated:(bool)animated {
    if (visible_)
        [[self navigationController] setNavigationBarHidden:(value && [self hidesNavigationBar]) animated:animated];
}

- (void) setHidesNavigationBar:(bool)value {
    if (hidesNavigationBar_ != value) {
        hidesNavigationBar_ = value;
        [self _setHidesNavigationBar:YES animated:YES];
    }
}

- (void) setHidesNavigationBarByNumber:(NSNumber *)value {
    [self setHidesNavigationBar:[value boolValue]];
}

- (void) viewWillAppear:(BOOL)animated {
    visible_ = true;

    if ([self hidesNavigationBar])
        [self _setHidesNavigationBar:YES animated:animated];

    [self dispatchEvent:@"CydiaViewWillAppear"];
    [super viewWillAppear:animated];
}

- (void) viewDidAppear:(BOOL)animated {
    [super viewDidAppear:animated];
    [self dispatchEvent:@"CydiaViewDidAppear"];
}

- (void) viewWillDisappear:(BOOL)animated {
    [self dispatchEvent:@"CydiaViewWillDisappear"];
    [super viewWillDisappear:animated];

    if ([self hidesNavigationBar])
        [self _setHidesNavigationBar:NO animated:animated];

    visible_ = false;
}

- (void) viewDidDisappear:(BOOL)animated {
    [super viewDidDisappear:animated];
    [self dispatchEvent:@"CydiaViewDidDisappear"];
}

@end