webframe.mm

linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自WebKit

    SelectionController selection;
    selection.setSelection(_private->coreFrame->selection()->selection());
    selection.modify(alteration, direction, granularity);
    return [DOMRange _wrapRange:selection.toNormalizedRange().get()];
}

- (TextGranularity)_selectionGranularity
{
    return _private->coreFrame->selectionGranularity();
}

- (NSRange)_convertToNSRange:(Range *)range
{
    if (!range || !range->startContainer())
        return NSMakeRange(NSNotFound, 0);

    Element* selectionRoot = _private->coreFrame->selection()->rootEditableElement();
    Element* scope = selectionRoot ? selectionRoot : _private->coreFrame->document()->documentElement();
    
    // Mouse events may cause TSM to attempt to create an NSRange for a portion of the view
    // that is not inside the current editable region.  These checks ensure we don't produce
    // potentially invalid data when responding to such requests.
    if (range->startContainer() != scope && !range->startContainer()->isDescendantOf(scope))
        return NSMakeRange(NSNotFound, 0);
    if (range->endContainer() != scope && !range->endContainer()->isDescendantOf(scope))
        return NSMakeRange(NSNotFound, 0);
    
    RefPtr<Range> testRange = Range::create(scope->document(), scope, 0, range->startContainer(), range->startOffset());
    ASSERT(testRange->startContainer() == scope);
    int startPosition = TextIterator::rangeLength(testRange.get());

    ExceptionCode ec;
    testRange->setEnd(range->endContainer(), range->endOffset(), ec);
    ASSERT(testRange->startContainer() == scope);
    int endPosition = TextIterator::rangeLength(testRange.get());

    return NSMakeRange(startPosition, endPosition - startPosition);
}

- (PassRefPtr<Range>)_convertToDOMRange:(NSRange)nsrange
{
    if (nsrange.location > INT_MAX)
        return 0;
    if (nsrange.length > INT_MAX || nsrange.location + nsrange.length > INT_MAX)
        nsrange.length = INT_MAX - nsrange.location;

    // our critical assumption is that we are only called by input methods that
    // concentrate on a given area containing the selection
    // We have to do this because of text fields and textareas. The DOM for those is not
    // directly in the document DOM, so serialization is problematic. Our solution is
    // to use the root editable element of the selection start as the positional base.
    // That fits with AppKit's idea of an input context.
    Element* selectionRoot = _private->coreFrame->selection()->rootEditableElement();
    Element* scope = selectionRoot ? selectionRoot : _private->coreFrame->document()->documentElement();
    return TextIterator::rangeFromLocationAndLength(scope, nsrange.location, nsrange.length);
}

- (DOMRange *)convertNSRangeToDOMRange:(NSRange)nsrange
{
    // This method exists to maintain compatibility with Leopard's Dictionary.app. <rdar://problem/6002160>
    return [self _convertNSRangeToDOMRange:nsrange];
}

- (DOMRange *)_convertNSRangeToDOMRange:(NSRange)nsrange
{
    return [DOMRange _wrapRange:[self _convertToDOMRange:nsrange].get()];
}

- (NSRange)convertDOMRangeToNSRange:(DOMRange *)range
{
    // This method exists to maintain compatibility with Leopard's Dictionary.app. <rdar://problem/6002160>
    return [self _convertDOMRangeToNSRange:range];
}

- (NSRange)_convertDOMRangeToNSRange:(DOMRange *)range
{
    return [self _convertToNSRange:[range _range]];
}

- (DOMRange *)_markDOMRange
{
    return [DOMRange _wrapRange:_private->coreFrame->mark().toNormalizedRange().get()];
}

// Given proposedRange, returns an extended range that includes adjacent whitespace that should
// be deleted along with the proposed range in order to preserve proper spacing and punctuation of
// the text surrounding the deletion.
- (DOMRange *)_smartDeleteRangeForProposedRange:(DOMRange *)proposedRange
{
    Node *startContainer = [[proposedRange startContainer] _node];
    Node *endContainer = [[proposedRange endContainer] _node];
    if (startContainer == nil || endContainer == nil)
        return nil;

    ASSERT(startContainer->document() == endContainer->document());
    
    _private->coreFrame->document()->updateLayoutIgnorePendingStylesheets();

    Position start(startContainer, [proposedRange startOffset]);
    Position end(endContainer, [proposedRange endOffset]);
    Position newStart = start.upstream().leadingWhitespacePosition(DOWNSTREAM, true);
    if (newStart.isNull())
        newStart = start;
    Position newEnd = end.downstream().trailingWhitespacePosition(DOWNSTREAM, true);
    if (newEnd.isNull())
        newEnd = end;

    newStart = rangeCompliantEquivalent(newStart);
    newEnd = rangeCompliantEquivalent(newEnd);

    RefPtr<Range> range = _private->coreFrame->document()->createRange();
    int exception = 0;
    range->setStart(newStart.node(), newStart.offset(), exception);
    range->setEnd(newStart.node(), newStart.offset(), exception);
    return [DOMRange _wrapRange:range.get()];
}

// Determines whether whitespace needs to be added around aString to preserve proper spacing and
// punctuation when it’s inserted into the receiver’s text over charRange. Returns by reference
// in beforeString and afterString any whitespace that should be added, unless either or both are
// nil. Both are returned as nil if aString is nil or if smart insertion and deletion are disabled.
- (void)_smartInsertForString:(NSString *)pasteString replacingRange:(DOMRange *)rangeToReplace beforeString:(NSString **)beforeString afterString:(NSString **)afterString
{
    // give back nil pointers in case of early returns
    if (beforeString)
        *beforeString = nil;
    if (afterString)
        *afterString = nil;
        
    // inspect destination
    Node *startContainer = [[rangeToReplace startContainer] _node];
    Node *endContainer = [[rangeToReplace endContainer] _node];

    Position startPos(startContainer, [rangeToReplace startOffset]);
    Position endPos(endContainer, [rangeToReplace endOffset]);

    VisiblePosition startVisiblePos = VisiblePosition(startPos, VP_DEFAULT_AFFINITY);
    VisiblePosition endVisiblePos = VisiblePosition(endPos, VP_DEFAULT_AFFINITY);
    
    // this check also ensures startContainer, startPos, endContainer, and endPos are non-null
    if (startVisiblePos.isNull() || endVisiblePos.isNull())
        return;

    bool addLeadingSpace = startPos.leadingWhitespacePosition(VP_DEFAULT_AFFINITY, true).isNull() && !isStartOfParagraph(startVisiblePos);
    if (addLeadingSpace)
        if (UChar previousChar = startVisiblePos.previous().characterAfter())
            addLeadingSpace = !isCharacterSmartReplaceExempt(previousChar, true);
    
    bool addTrailingSpace = endPos.trailingWhitespacePosition(VP_DEFAULT_AFFINITY, true).isNull() && !isEndOfParagraph(endVisiblePos);
    if (addTrailingSpace)
        if (UChar thisChar = endVisiblePos.characterAfter())
            addTrailingSpace = !isCharacterSmartReplaceExempt(thisChar, false);
    
    // inspect source
    bool hasWhitespaceAtStart = false;
    bool hasWhitespaceAtEnd = false;
    unsigned pasteLength = [pasteString length];
    if (pasteLength > 0) {
        NSCharacterSet *whiteSet = [NSCharacterSet whitespaceAndNewlineCharacterSet];
        
        if ([whiteSet characterIsMember:[pasteString characterAtIndex:0]]) {
            hasWhitespaceAtStart = YES;
        }
        if ([whiteSet characterIsMember:[pasteString characterAtIndex:(pasteLength - 1)]]) {
            hasWhitespaceAtEnd = YES;
        }
    }
    
    // issue the verdict
    if (beforeString && addLeadingSpace && !hasWhitespaceAtStart)
        *beforeString = @" ";
    if (afterString && addTrailingSpace && !hasWhitespaceAtEnd)
        *afterString = @" ";
}

- (DOMDocumentFragment *)_documentFragmentWithMarkupString:(NSString *)markupString baseURLString:(NSString *)baseURLString 
{
    if (!_private->coreFrame || !_private->coreFrame->document())
        return 0;

    return [DOMDocumentFragment _wrapDocumentFragment:createFragmentFromMarkup(_private->coreFrame->document(), markupString, baseURLString).get()];
}

- (DOMDocumentFragment *)_documentFragmentWithNodesAsParagraphs:(NSArray *)nodes
{
    if (!_private->coreFrame || !_private->coreFrame->document())
        return 0;
    
    NSEnumerator *nodeEnum = [nodes objectEnumerator];
    Vector<Node*> nodesVector;
    DOMNode *node;
    while ((node = [nodeEnum nextObject]))
        nodesVector.append([node _node]);
    
    return [DOMDocumentFragment _wrapDocumentFragment:createFragmentFromNodes(_private->coreFrame->document(), nodesVector).get()];
}

- (void)_replaceSelectionWithNode:(DOMNode *)node selectReplacement:(BOOL)selectReplacement smartReplace:(BOOL)smartReplace matchStyle:(BOOL)matchStyle
{
    DOMDocumentFragment *fragment = [DOMDocumentFragment _wrapDocumentFragment:_private->coreFrame->document()->createDocumentFragment().get()];
    [fragment appendChild:node];
    [self _replaceSelectionWithFragment:fragment selectReplacement:selectReplacement smartReplace:smartReplace matchStyle:matchStyle];
}

- (void)_insertParagraphSeparatorInQuotedContent
{
    if (_private->coreFrame->selection()->isNone())
        return;
    
    TypingCommand::insertParagraphSeparatorInQuotedContent(_private->coreFrame->document());
    _private->coreFrame->revealSelection(ScrollAlignment::alignToEdgeIfNeeded);
}

- (VisiblePosition)_visiblePositionForPoint:(NSPoint)point
{
    // FIXME: Someone with access to Apple's sources could remove this needless wrapper call.
    return _private->coreFrame->visiblePositionForPoint(IntPoint(point));
}

- (DOMRange *)_characterRangeAtPoint:(NSPoint)point
{
    VisiblePosition position = [self _visiblePositionForPoint:point];
    if (position.isNull())
        return nil;
    
    VisiblePosition previous = position.previous();
    if (previous.isNotNull()) {
        DOMRange *previousCharacterRange = [DOMRange _wrapRange:makeRange(previous, position).get()];
        NSRect rect = [self _firstRectForDOMRange:previousCharacterRange];
        if (NSPointInRect(point, rect))
            return previousCharacterRange;
    }

    VisiblePosition next = position.next();
    if (next.isNotNull()) {
        DOMRange *nextCharacterRange = [DOMRange _wrapRange:makeRange(position, next).get()];
        NSRect rect = [self _firstRectForDOMRange:nextCharacterRange];
        if (NSPointInRect(point, rect))
            return nextCharacterRange;
    }
    
    return nil;
}

- (DOMCSSStyleDeclaration *)_typingStyle
{
    if (!_private->coreFrame || !_private->coreFrame->typingStyle())
        return nil;
    return [DOMCSSStyleDeclaration _wrapCSSStyleDeclaration:_private->coreFrame->typingStyle()->copy().get()];
}

- (void)_setTypingStyle:(DOMCSSStyleDeclaration *)style withUndoAction:(EditAction)undoAction
{
    if (!_private->coreFrame)
        return;
    _private->coreFrame->computeAndSetTypingStyle([style _CSSStyleDeclaration], undoAction);
}

- (void)_dragSourceMovedTo:(NSPoint)windowLoc
{
    if (!_private->coreFrame)
        return;
    FrameView* view = _private->coreFrame->view();
    if (!view)
        return;
    // FIXME: These are fake modifier keys here, but they should be real ones instead.
    PlatformMouseEvent event(IntPoint(windowLoc), globalPoint(windowLoc, [view->platformWidget() window]),
        LeftButton, MouseEventMoved, 0, false, false, false, false, currentTime());
    _private->coreFrame->eventHandler()->dragSourceMovedTo(event);
}

- (void)_dragSourceEndedAt:(NSPoint)windowLoc operation:(NSDragOperation)operation
{
    if (!_private->coreFrame)
        return;
    FrameView* view = _private->coreFrame->view();
    if (!view)
        return;
    // FIXME: These are fake modifier keys here, but they should be real ones instead.
    PlatformMouseEvent event(IntPoint(windowLoc), globalPoint(windowLoc, [view->platformWidget() window]),
        LeftButton, MouseEventMoved, 0, false, false, false, false, currentTime());
    _private->coreFrame->eventHandler()->dragSourceEndedAt(event, (DragOperation)operation);
}

- (BOOL)_canProvideDocumentSource
{
    Frame* frame = _private->coreFrame;
    String mimeType = frame->loader()->responseMIMEType();
    PluginData* pluginData = frame->page() ? frame->page()->pluginData() : 0;

    if (WebCore::DOMImplementation::isTextMIMEType(mimeType) ||
        Image::supportsType(mimeType) ||
        (pluginData && pluginData->supportsMimeType(mimeType)))
        return NO;

    return YES;
}

- (BOOL)_canSaveAsWebArchive
{
    // Currently, all documents that we can view source for
    // (HTML and XML documents) can also be saved as web archives
    return [self _canProvideDocumentSource];
}

- (void)_receivedData:(NSData *)data textEncodingName:(NSString *)textEncodingName
{
    // Set the encoding. This only needs to be done once, but it's harmless to do it again later.
    String encoding = _private->coreFrame->loader()->documentLoader()->overrideEncoding();
    bool userChosen = !encoding.isNull();
    if (encoding.isNull())
        encoding = textEncodingName;
    _private->coreFrame->loader()->setEncoding(encoding, userChosen);
    [self _addData:data];
}

@end

@implementation WebFrame (WebPrivate)

// FIXME: This exists only as a convenience for Safari, consider moving there.
- (BOOL)_isDescendantOfFrame:(WebFrame *)ancestor
{
    Frame* coreFrame = _private->coreFrame;
    return coreFrame && coreFrame->tree()->isDescendantOf(core(ancestor));
}

- (void)_setShouldCreateRenderers:(BOOL)shouldCreateRenderers
{
    _private->shouldCreateRenderers = shouldCreateRenderers;
}

- (NSColor *)_bodyBackgroundColor
{
    Document* document = _private->coreFrame->document();
    if (!document)
        return nil;
    HTMLElement* body = document->body();
    if (!body)
        return nil;
    RenderObject* bodyRenderer = body->renderer();
    if (!bodyRenderer)
        return nil;
    Color color = bodyRenderer->style()->backgroundColor();
    if (!color.isValid())
        return nil;
    return nsColor(color);
}

- (BOOL)_isFrameSet
{
    Document* document = _private->coreFrame->document();
    return document && document->isFrameSet();
}

- (BOOL)_firstLayoutDone
{