webframeview.mm

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    if ([firstResponder isKindOfClass:[WebHTMLView class]]) {
        return NO;
    }
    return [firstResponder isKindOfClass:[NSControl class]];
}

- (void)keyDown:(NSEvent *)event
{
    NSString *characters = [event characters];
    int index, count;
    BOOL callSuper = YES;
    Frame* coreFrame = [self _web_frame];
    BOOL maintainsBackForwardList = coreFrame && coreFrame->page()->backForwardList()->enabled() ? YES : NO;
    
    count = [characters length];
    for (index = 0; index < count; ++index) {
        switch ([characters characterAtIndex:index]) {
            case NSDeleteCharacter:
                if (!maintainsBackForwardList) {
                    callSuper = YES;
                    break;
                }
                // This odd behavior matches some existing browsers,
                // including Windows IE
                if ([event modifierFlags] & NSShiftKeyMask) {
                    [self _goForward];
                } else {
                    [self _goBack];
                }
                callSuper = NO;
                break;
            case SpaceKey:
                // Checking for a control will allow events to percolate 
                // correctly when the focus is on a form control and we
                // are in full keyboard access mode.
                if ((![self allowsScrolling] && ![self _largestChildWithScrollBars]) || [self _firstResponderIsFormControl]) {
                    callSuper = YES;
                    break;
                }
                if ([event modifierFlags] & NSShiftKeyMask) {
                    [self scrollPageUp:nil];
                } else {
                    [self scrollPageDown:nil];
                }
                callSuper = NO;
                break;
            case NSPageUpFunctionKey:
                if (![self allowsScrolling] && ![self _largestChildWithScrollBars]) {
                    callSuper = YES;
                    break;
                }
                [self scrollPageUp:nil];
                callSuper = NO;
                break;
            case NSPageDownFunctionKey:
                if (![self allowsScrolling] && ![self _largestChildWithScrollBars]) {
                    callSuper = YES;
                    break;
                }
                [self scrollPageDown:nil];
                callSuper = NO;
                break;
            case NSHomeFunctionKey:
                if (![self allowsScrolling] && ![self _largestChildWithScrollBars]) {
                    callSuper = YES;
                    break;
                }
                [self scrollToBeginningOfDocument:nil];
                callSuper = NO;
                break;
            case NSEndFunctionKey:
                if (![self allowsScrolling] && ![self _largestChildWithScrollBars]) {
                    callSuper = YES;
                    break;
                }
                [self scrollToEndOfDocument:nil];
                callSuper = NO;
                break;
            case NSUpArrowFunctionKey:
                // We don't handle shifted or control-arrow keys here, so let super have a chance.
                if ([event modifierFlags] & (NSShiftKeyMask | NSControlKeyMask)) {
                    callSuper = YES;
                    break;
                }
                if ((![self allowsScrolling] && ![self _largestChildWithScrollBars]) ||
                    [[[self window] firstResponder] isKindOfClass:[NSPopUpButton class]]) {
                    // Let arrow keys go through to pop up buttons
                    // <rdar://problem/3455910>: hitting up or down arrows when focus is on a 
                    // pop-up menu should pop the menu
                    callSuper = YES;
                    break;
                }
                if ([event modifierFlags] & NSCommandKeyMask) {
                    [self scrollToBeginningOfDocument:nil];
                } else if ([event modifierFlags] & NSAlternateKeyMask) {
                    [self scrollPageUp:nil];
                } else {
                    [self scrollLineUp:nil];
                }
                callSuper = NO;
                break;
            case NSDownArrowFunctionKey:
                // We don't handle shifted or control-arrow keys here, so let super have a chance.
                if ([event modifierFlags] & (NSShiftKeyMask | NSControlKeyMask)) {
                    callSuper = YES;
                    break;
                }
                if ((![self allowsScrolling] && ![self _largestChildWithScrollBars]) ||
                    [[[self window] firstResponder] isKindOfClass:[NSPopUpButton class]]) {
                    // Let arrow keys go through to pop up buttons
                    // <rdar://problem/3455910>: hitting up or down arrows when focus is on a 
                    // pop-up menu should pop the menu
                    callSuper = YES;
                    break;
                }
                if ([event modifierFlags] & NSCommandKeyMask) {
                    [self scrollToEndOfDocument:nil];
                } else if ([event modifierFlags] & NSAlternateKeyMask) {
                    [self scrollPageDown:nil];
                } else {
                    [self scrollLineDown:nil];
                }
                callSuper = NO;
                break;
            case NSLeftArrowFunctionKey:
                // We don't handle shifted or control-arrow keys here, so let super have a chance.
                if ([event modifierFlags] & (NSShiftKeyMask | NSControlKeyMask)) {
                    callSuper = YES;
                    break;
                }
                // Check back/forward related keys.
                if ([event modifierFlags] & NSCommandKeyMask) {
                    if (!maintainsBackForwardList) {
                        callSuper = YES;
                        break;
                    }
                    [self _goBack];
                } else {
                    // Now check scrolling related keys.
                    if ((![self allowsScrolling] && ![self _largestChildWithScrollBars])) {
                        callSuper = YES;
                        break;
                    }

                    if ([event modifierFlags] & NSAlternateKeyMask) {
                        [self _pageHorizontally:YES];
                    } else {
                        [self _scrollLineHorizontally:YES];
                    }
                }
                callSuper = NO;
                break;
            case NSRightArrowFunctionKey:
                // We don't handle shifted or control-arrow keys here, so let super have a chance.
                if ([event modifierFlags] & (NSShiftKeyMask | NSControlKeyMask)) {
                    callSuper = YES;
                    break;
                }
                // Check back/forward related keys.
                if ([event modifierFlags] & NSCommandKeyMask) {
                    if (!maintainsBackForwardList) {
                        callSuper = YES;
                        break;
                    }
                    [self _goForward];
                } else {
                    // Now check scrolling related keys.
                    if ((![self allowsScrolling] && ![self _largestChildWithScrollBars])) {
                        callSuper = YES;
                        break;
                    }

                    if ([event modifierFlags] & NSAlternateKeyMask) {
                        [self _pageHorizontally:NO];
                    } else {
                        [self _scrollLineHorizontally:NO];
                    }
                }
                callSuper = NO;
                break;
        }
    }
    
    if (callSuper) {
        [super keyDown:event];
    } else {
        // if we did something useful, get the cursor out of the way
        [NSCursor setHiddenUntilMouseMoves:YES];
    }
}

- (NSView *)_webcore_effectiveFirstResponder
{
    NSView *view = [self documentView];
    return view ? [view _webcore_effectiveFirstResponder] : [super _webcore_effectiveFirstResponder];
}

- (BOOL)canPrintHeadersAndFooters
{
    NSView *documentView = [[self _scrollView] documentView];
    if ([documentView respondsToSelector:@selector(canPrintHeadersAndFooters)]) {
        return [(id)documentView canPrintHeadersAndFooters];
    }
    return NO;
}

- (NSPrintOperation *)printOperationWithPrintInfo:(NSPrintInfo *)printInfo
{
    NSView *documentView = [[self _scrollView] documentView];
    if (!documentView) {
        return nil;
    }
    if ([documentView respondsToSelector:@selector(printOperationWithPrintInfo:)]) {
        return [(id)documentView printOperationWithPrintInfo:printInfo];
    }
    return [NSPrintOperation printOperationWithView:documentView printInfo:printInfo];
}

- (BOOL)documentViewShouldHandlePrint
{
    NSView *documentView = [[self _scrollView] documentView];
    if (documentView && [documentView respondsToSelector:@selector(documentViewShouldHandlePrint)])
        return [(id)documentView documentViewShouldHandlePrint];
    
    return NO;
}

- (void)printDocumentView
{
    NSView *documentView = [[self _scrollView] documentView];
    if (documentView && [documentView respondsToSelector:@selector(printDocumentView)])
        [(id)documentView printDocumentView];
}

@end

@implementation WebFrameView (WebPrivate)

- (float)_area
{
    NSRect frame = [self frame];
    return frame.size.height * frame.size.width;
}

- (BOOL)_hasScrollBars
{
    NSScrollView *scrollView = [self _scrollView];
    return [scrollView hasHorizontalScroller] || [scrollView hasVerticalScroller];
}

- (WebFrameView *)_largestChildWithScrollBars
{
    WebFrameView *largest = nil;
    NSArray *frameChildren = [[self webFrame] childFrames];
    
    unsigned i;
    for (i=0; i < [frameChildren count]; i++) {
        WebFrameView *childFrameView = [[frameChildren objectAtIndex:i] frameView];
        WebFrameView *scrollableFrameView = [childFrameView _hasScrollBars] ? childFrameView : [childFrameView _largestChildWithScrollBars];
        if (!scrollableFrameView)
            continue;
        
        // Some ads lurk in child frames of zero width and height, see radar 4406994. These don't count as scrollable.
        // Maybe someday we'll discover that this minimum area check should be larger, but this covers the known cases.
        float area = [scrollableFrameView _area];
        if (area < 1.0)
            continue;
        
        if (!largest || (area > [largest _area])) {
            largest = scrollableFrameView;
        }
    }
    
    return largest;
}

- (NSClipView *)_contentView
{
    return [[self _scrollView] contentView];
}

- (Class)_customScrollViewClass
{
    if ([_private->frameScrollView class] == [WebDynamicScrollBarsView class])
        return nil;
    return [_private->frameScrollView class];
}

- (void)_setCustomScrollViewClass:(Class)customClass
{
    if (!customClass)
        customClass = [WebDynamicScrollBarsView class];
    ASSERT([customClass isSubclassOfClass:[WebDynamicScrollBarsView class]]);
    if (customClass == [_private->frameScrollView class])
        return;
    if (![customClass isSubclassOfClass:[WebDynamicScrollBarsView class]])
        return;

    WebDynamicScrollBarsView *oldScrollView = _private->frameScrollView; // already retained
    NSView <WebDocumentView> *documentView = [[self documentView] retain];

    WebDynamicScrollBarsView *scrollView  = [[customClass alloc] initWithFrame:[oldScrollView frame]];
    [scrollView setContentView:[[[WebClipView alloc] initWithFrame:[scrollView bounds]] autorelease]];
    [scrollView setDrawsBackground:[oldScrollView drawsBackground]];
    [scrollView setHasVerticalScroller:[oldScrollView hasVerticalScroller]];
    [scrollView setHasHorizontalScroller:[oldScrollView hasHorizontalScroller]];
    [scrollView setAutoresizingMask:[oldScrollView autoresizingMask]];
    [scrollView setLineScroll:[oldScrollView lineScroll]];
    [self addSubview:scrollView];

    // don't call our overridden version here; we need to make the standard NSView link between us
    // and our subview so that previousKeyView and previousValidKeyView work as expected. This works
    // together with our becomeFirstResponder and setNextKeyView overrides.
    [super setNextKeyView:scrollView];

    _private->frameScrollView = scrollView;

    [self _setDocumentView:documentView];
    [self _install];

    [oldScrollView removeFromSuperview];
    [oldScrollView release];
    [documentView release];
}

@end