htmlediting_impl.cpp

来自「手机浏览器源码程序,功能强大」· C++ 代码 · 共 1,886 行 · 第 1/5 页

void CompositeEditCommandImpl::applyCommandToComposite(EditCommand &cmd)
{
    cmd.setStartingSelection(endingSelection());
    cmd.setEndingSelection(endingSelection());
    cmd.setParent(this);
    cmd.apply();
    m_cmds.append(cmd);
}

void CompositeEditCommandImpl::insertNodeBefore(NodeImpl *insertChild, NodeImpl *refChild)
{
    InsertNodeBeforeCommand cmd(document(), insertChild, refChild);
    applyCommandToComposite(cmd);
}

void CompositeEditCommandImpl::insertNodeAfter(NodeImpl *insertChild, NodeImpl *refChild)
{
    if (refChild->parentNode()->lastChild() == refChild) {
        appendNode(refChild->parentNode(), insertChild);
    }
    else {
        ASSERT(refChild->nextSibling());
        insertNodeBefore(insertChild, refChild->nextSibling());
    }
}

void CompositeEditCommandImpl::insertNodeAt(NodeImpl *insertChild, NodeImpl *refChild, long offset)
{
    if (refChild->hasChildNodes() || (refChild->renderer() && refChild->renderer()->isBlockFlow())) {
        NodeImpl *child = refChild->firstChild();
        for (long i = 0; child && i < offset; i++)
            child = child->nextSibling();
        if (child)
            insertNodeBefore(insertChild, child);
        else
            appendNode(refChild, insertChild);
    } 
    else if (refChild->caretMinOffset() >= offset) {
        insertNodeBefore(insertChild, refChild);
    } 
    else if (refChild->isTextNode() && refChild->caretMaxOffset() > offset) {
        splitTextNode(static_cast<TextImpl *>(refChild), offset);
        insertNodeBefore(insertChild, refChild);
    } 
    else {
        insertNodeAfter(insertChild, refChild);
    }
}

void CompositeEditCommandImpl::appendNode(NodeImpl *parent, NodeImpl *appendChild)
{
    AppendNodeCommand cmd(document(), parent, appendChild);
    applyCommandToComposite(cmd);
}

void CompositeEditCommandImpl::removeNode(NodeImpl *removeChild)
{
    RemoveNodeCommand cmd(document(), removeChild);
    applyCommandToComposite(cmd);
}

void CompositeEditCommandImpl::removeNodeAndPrune(NodeImpl *pruneNode, NodeImpl *stopNode)
{
    RemoveNodeAndPruneCommand cmd(document(), pruneNode, stopNode);
    applyCommandToComposite(cmd);
}

void CompositeEditCommandImpl::removeNodePreservingChildren(NodeImpl *removeChild)
{
    RemoveNodePreservingChildrenCommand cmd(document(), removeChild);
    applyCommandToComposite(cmd);
}

void CompositeEditCommandImpl::splitTextNode(TextImpl *text, long offset)
{
    SplitTextNodeCommand cmd(document(), text, offset);
    applyCommandToComposite(cmd);
}

void CompositeEditCommandImpl::joinTextNodes(TextImpl *text1, TextImpl *text2)
{
    JoinTextNodesCommand cmd(document(), text1, text2);
    applyCommandToComposite(cmd);
}

void CompositeEditCommandImpl::inputText(const DOMString &text)
{
    InputTextCommand cmd(document());
    applyCommandToComposite(cmd);
    cmd.input(text);
}

void CompositeEditCommandImpl::insertText(TextImpl *node, long offset, const DOMString &text)
{
    InsertTextCommand cmd(document(), node, offset, text);
    applyCommandToComposite(cmd);
}

void CompositeEditCommandImpl::deleteText(TextImpl *node, long offset, long count)
{
    DeleteTextCommand cmd(document(), node, offset, count);
    applyCommandToComposite(cmd);
}

void CompositeEditCommandImpl::replaceText(TextImpl *node, long offset, long count, const DOMString &replacementText)
{
    DeleteTextCommand deleteCommand(document(), node, offset, count);
    applyCommandToComposite(deleteCommand);
    InsertTextCommand insertCommand(document(), node, offset, replacementText);
    applyCommandToComposite(insertCommand);
}

void CompositeEditCommandImpl::deleteSelection()
{
    if (endingSelection().state() == Selection::RANGE) {
        DeleteSelectionCommand cmd(document());
        applyCommandToComposite(cmd);
    }
}

void CompositeEditCommandImpl::deleteSelection(const Selection &selection)
{
    if (selection.state() == Selection::RANGE) {
        DeleteSelectionCommand cmd(document(), selection);
        applyCommandToComposite(cmd);
    }
}

void CompositeEditCommandImpl::deleteCollapsibleWhitespace()
{
    DeleteCollapsibleWhitespaceCommand cmd(document());
    applyCommandToComposite(cmd);
}

void CompositeEditCommandImpl::deleteCollapsibleWhitespace(const Selection &selection)
{
    DeleteCollapsibleWhitespaceCommand cmd(document(), selection);
    applyCommandToComposite(cmd);
}

void CompositeEditCommandImpl::removeCSSProperty(CSSStyleDeclarationImpl *decl, int property)
{
    RemoveCSSPropertyCommand cmd(document(), decl, property);
    applyCommandToComposite(cmd);
}

void CompositeEditCommandImpl::removeNodeAttribute(ElementImpl *element, int attribute)
{
    RemoveNodeAttributeCommand cmd(document(), element, attribute);
    applyCommandToComposite(cmd);
}

void CompositeEditCommandImpl::setNodeAttribute(ElementImpl *element, int attribute, const DOMString &value)
{
    SetNodeAttributeCommand cmd(document(), element, attribute, value);
    applyCommandToComposite(cmd);
}

ElementImpl *CompositeEditCommandImpl::createTypingStyleElement() const
{
    int exceptionCode = 0;
    ElementImpl *styleElement = document()->createHTMLElement("SPAN", exceptionCode);
    ASSERT(exceptionCode == 0);
    
    styleElement->setAttribute(ATTR_STYLE, document()->part()->typingStyle()->cssText().implementation(), exceptionCode);
    ASSERT(exceptionCode == 0);

    styleElement->setAttribute(ATTR_CLASS, styleSpanClassString());
    ASSERT(exceptionCode == 0);

    return styleElement;
}

//==========================================================================================
// Concrete commands
//------------------------------------------------------------------------------------------
// AppendNodeCommandImpl

AppendNodeCommandImpl::AppendNodeCommandImpl(DocumentImpl *document, NodeImpl *parentNode, NodeImpl *appendChild)
    : EditCommandImpl(document), m_parentNode(parentNode), m_appendChild(appendChild)
{
    ASSERT(m_parentNode);
    m_parentNode->ref();

    ASSERT(m_appendChild);
    m_appendChild->ref();
}

AppendNodeCommandImpl::~AppendNodeCommandImpl()
{
    if (m_parentNode)
        m_parentNode->deref();
    if (m_appendChild)
        m_appendChild->deref();
}

int AppendNodeCommandImpl::commandID() const
{
    return AppendNodeCommandID;
}

void AppendNodeCommandImpl::doApply()
{
    ASSERT(m_parentNode);
    ASSERT(m_appendChild);

    int exceptionCode = 0;
    m_parentNode->appendChild(m_appendChild, exceptionCode);
    ASSERT(exceptionCode == 0);
}

void AppendNodeCommandImpl::doUnapply()
{
    ASSERT(m_parentNode);
    ASSERT(m_appendChild);
    ASSERT(state() == Applied);

    int exceptionCode = 0;
    m_parentNode->removeChild(m_appendChild, exceptionCode);
    ASSERT(exceptionCode == 0);
}

//------------------------------------------------------------------------------------------
// ApplyStyleCommandImpl

ApplyStyleCommandImpl::ApplyStyleCommandImpl(DocumentImpl *document, CSSStyleDeclarationImpl *style)
    : CompositeEditCommandImpl(document), m_style(style)
{   
    ASSERT(m_style);
    m_style->ref();
}

ApplyStyleCommandImpl::~ApplyStyleCommandImpl()
{
    ASSERT(m_style);
    m_style->deref();
}

int ApplyStyleCommandImpl::commandID() const
{
    return ApplyStyleCommandID;
}

void ApplyStyleCommandImpl::doApply()
{
    if (endingSelection().state() != Selection::RANGE)
        return;

    // adjust to the positions we want to use for applying style
    Position start(endingSelection().start().equivalentDownstreamPosition().equivalentRangeCompliantPosition());
    Position end(endingSelection().end().equivalentUpstreamPosition());

    // remove style from the selection
    removeStyle(start, end);
    bool splitStart = splitTextAtStartIfNeeded(start, end); 
    if (splitStart) {
        start = endingSelection().start();
        end = endingSelection().end();
    }
    splitTextAtEndIfNeeded(start, end);
    start = endingSelection().start();
    end = endingSelection().end();

    
    if (start.node() == end.node()) {
        // simple case...start and end are the same node
        applyStyleIfNeeded(start.node(), end.node());
    }
    else {
        NodeImpl *node = start.node();
        while (1) {
            if (node->childNodeCount() == 0 && node->renderer() && node->renderer()->isInline()) {
                NodeImpl *runStart = node;
                while (1) {
                    if (runStart->parentNode() != node->parentNode() || node->isHTMLElement() || node == end.node() || 
                        (node->renderer() && !node->renderer()->isInline())) {
                        applyStyleIfNeeded(runStart, node);
                        break;
                    }
                    node = node->traverseNextNode();
                }
            }
            if (node == end.node())
                break;
            node = node->traverseNextNode();
        }
    }
}

//------------------------------------------------------------------------------------------
// ApplyStyleCommandImpl: style-removal helpers

bool ApplyStyleCommandImpl::isHTMLStyleNode(HTMLElementImpl *elem)
{
    for (QPtrListIterator<CSSProperty> it(*(style()->values())); it.current(); ++it) {
        CSSProperty *property = it.current();
        switch (property->id()) {
            case CSS_PROP_FONT_WEIGHT:
                if (elem->id() == ID_B)
                    return true;
                break;
            case CSS_PROP_FONT_STYLE:
                if (elem->id() == ID_I)
                    return true;
                break;
        }
    }

    return false;
}

void ApplyStyleCommandImpl::removeHTMLStyleNode(HTMLElementImpl *elem)
{
    // This node can be removed.
    // EDIT FIXME: This does not handle the case where the node
    // has attributes. But how often do people add attributes to <B> tags? 
    // Not so often I think.
    ASSERT(elem);
    removeNodePreservingChildren(elem);
}

void ApplyStyleCommandImpl::removeCSSStyle(HTMLElementImpl *elem)
{
    ASSERT(elem);

    CSSStyleDeclarationImpl *decl = elem->inlineStyleDecl();
    if (!decl)
        return;

    for (QPtrListIterator<CSSProperty> it(*(style()->values())); it.current(); ++it) {
        CSSProperty *property = it.current();
        if (decl->getPropertyCSSValue(property->id()))
            removeCSSProperty(decl, property->id());
    }

    if (elem->id() == ID_SPAN) {
        // Check to see if the span is one we added to apply style.
        // If it is, and there are no more attributes on the span other than our
        // class marker, remove the span.
        NamedAttrMapImpl *map = elem->attributes();
        if (map && map->length() == 1 && elem->getAttribute(ATTR_CLASS) == styleSpanClassString())
            removeNodePreservingChildren(elem);
    }
}

void ApplyStyleCommandImpl::removeStyle(const Position &start, const Position &end)
{
    NodeImpl *node = start.node();
    while (1) {
        NodeImpl *next = node->traverseNextNode();
        if (node->isHTMLElement() && nodeFullySelected(node)) {
            HTMLElementImpl *elem = static_cast<HTMLElementImpl *>(node);
            if (isHTMLStyleNode(elem))
                removeHTMLStyleNode(elem);
            else
                removeCSSStyle(elem);
        }
        if (node == end.node())
            break;
        node = next;
    }
}

bool ApplyStyleCommandImpl::nodeFullySelected(const NodeImpl *node) const
{
    ASSERT(node);

    Position end(endingSelection().end().equivalentUpstreamPosition());
    
    if (node == end.node())
        return end.offset() >= node->caretMaxOffset();

    for (NodeImpl *child = node->lastChild(); child; child = child->lastChild()) {
        if (child == end.node())
            return end.offset() >= child->caretMaxOffset();
    }

    return !node->isAncestor(end.node());