editor.cpp

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    ExceptionCode ec = 0;
    RefPtr<Event> evt = ClipboardEvent::create(eventType, true, true, clipboard);
    target->dispatchEvent(evt, ec);
    bool noDefaultProcessing = evt->defaultPrevented();

    // invalidate clipboard here for security
    clipboard->setAccessPolicy(ClipboardNumb);
    
    return !noDefaultProcessing;
}

void Editor::applyStyle(CSSStyleDeclaration* style, EditAction editingAction)
{
    switch (m_frame->selection()->selectionType()) {
        case VisibleSelection::NoSelection:
            // do nothing
            break;
        case VisibleSelection::CaretSelection:
            m_frame->computeAndSetTypingStyle(style, editingAction);
            break;
        case VisibleSelection::RangeSelection:
            if (style)
                applyCommand(ApplyStyleCommand::create(m_frame->document(), style, editingAction));
            break;
    }
}
    
bool Editor::shouldApplyStyle(CSSStyleDeclaration* style, Range* range)
{   
    return client()->shouldApplyStyle(style, range);
}
    
void Editor::applyParagraphStyle(CSSStyleDeclaration* style, EditAction editingAction)
{
    switch (m_frame->selection()->selectionType()) {
        case VisibleSelection::NoSelection:
            // do nothing
            break;
        case VisibleSelection::CaretSelection:
        case VisibleSelection::RangeSelection:
            if (style)
                applyCommand(ApplyStyleCommand::create(m_frame->document(), style, editingAction, ApplyStyleCommand::ForceBlockProperties));
            break;
    }
}

void Editor::applyStyleToSelection(CSSStyleDeclaration* style, EditAction editingAction)
{
    if (!style || style->length() == 0 || !canEditRichly())
        return;

    if (client() && client()->shouldApplyStyle(style, m_frame->selection()->toNormalizedRange().get()))
        applyStyle(style, editingAction);
}

void Editor::applyParagraphStyleToSelection(CSSStyleDeclaration* style, EditAction editingAction)
{
    if (!style || style->length() == 0 || !canEditRichly())
        return;
    
    if (client() && client()->shouldApplyStyle(style, m_frame->selection()->toNormalizedRange().get()))
        applyParagraphStyle(style, editingAction);
}

bool Editor::clientIsEditable() const
{
    return client() && client()->isEditable();
}

bool Editor::selectionStartHasStyle(CSSStyleDeclaration* style) const
{
    Node* nodeToRemove;
    RefPtr<CSSComputedStyleDeclaration> selectionStyle = m_frame->selectionComputedStyle(nodeToRemove);
    if (!selectionStyle)
        return false;
    
    RefPtr<CSSMutableStyleDeclaration> mutableStyle = style->makeMutable();
    
    bool match = true;
    CSSMutableStyleDeclaration::const_iterator end = mutableStyle->end();
    for (CSSMutableStyleDeclaration::const_iterator it = mutableStyle->begin(); it != end; ++it) {
        int propertyID = (*it).id();
        if (!equalIgnoringCase(mutableStyle->getPropertyValue(propertyID), selectionStyle->getPropertyValue(propertyID))) {
            match = false;
            break;
        }
    }
    
    if (nodeToRemove) {
        ExceptionCode ec = 0;
        nodeToRemove->remove(ec);
        ASSERT(ec == 0);
    }
    
    return match;
}

static void updateState(CSSMutableStyleDeclaration* desiredStyle, CSSComputedStyleDeclaration* computedStyle, bool& atStart, TriState& state)
{
    CSSMutableStyleDeclaration::const_iterator end = desiredStyle->end();
    for (CSSMutableStyleDeclaration::const_iterator it = desiredStyle->begin(); it != end; ++it) {
        int propertyID = (*it).id();
        String desiredProperty = desiredStyle->getPropertyValue(propertyID);
        String computedProperty = computedStyle->getPropertyValue(propertyID);
        TriState propertyState = equalIgnoringCase(desiredProperty, computedProperty)
            ? TrueTriState : FalseTriState;
        if (atStart) {
            state = propertyState;
            atStart = false;
        } else if (state != propertyState) {
            state = MixedTriState;
            break;
        }
    }
}

TriState Editor::selectionHasStyle(CSSStyleDeclaration* style) const
{
    bool atStart = true;
    TriState state = FalseTriState;

    RefPtr<CSSMutableStyleDeclaration> mutableStyle = style->makeMutable();

    if (!m_frame->selection()->isRange()) {
        Node* nodeToRemove;
        RefPtr<CSSComputedStyleDeclaration> selectionStyle = m_frame->selectionComputedStyle(nodeToRemove);
        if (!selectionStyle)
            return FalseTriState;
        updateState(mutableStyle.get(), selectionStyle.get(), atStart, state);
        if (nodeToRemove) {
            ExceptionCode ec = 0;
            nodeToRemove->remove(ec);
            ASSERT(ec == 0);
        }
    } else {
        for (Node* node = m_frame->selection()->start().node(); node; node = node->traverseNextNode()) {
            RefPtr<CSSComputedStyleDeclaration> nodeStyle = computedStyle(node);
            if (nodeStyle)
                updateState(mutableStyle.get(), nodeStyle.get(), atStart, state);
            if (state == MixedTriState)
                break;
            if (node == m_frame->selection()->end().node())
                break;
        }
    }

    return state;
}
void Editor::indent()
{
    applyCommand(IndentOutdentCommand::create(m_frame->document(), IndentOutdentCommand::Indent));
}

void Editor::outdent()
{
    applyCommand(IndentOutdentCommand::create(m_frame->document(), IndentOutdentCommand::Outdent));
}

static void dispatchEditableContentChangedEvents(const EditCommand& command)
{
    Element* startRoot = command.startingRootEditableElement();
    Element* endRoot = command.endingRootEditableElement();
    ExceptionCode ec;
    if (startRoot)
        startRoot->dispatchEvent(Event::create(eventNames().webkitEditableContentChangedEvent, false, false), ec);
    if (endRoot && endRoot != startRoot)
        endRoot->dispatchEvent(Event::create(eventNames().webkitEditableContentChangedEvent, false, false), ec);
}

void Editor::appliedEditing(PassRefPtr<EditCommand> cmd)
{
    dispatchEditableContentChangedEvents(*cmd);
    
    VisibleSelection newSelection(cmd->endingSelection());
    // Don't clear the typing style with this selection change.  We do those things elsewhere if necessary.
    changeSelectionAfterCommand(newSelection, false, false, cmd.get());
        
    if (!cmd->preservesTypingStyle())
        m_frame->setTypingStyle(0);
    
    // Command will be equal to last edit command only in the case of typing
    if (m_lastEditCommand.get() == cmd)
        ASSERT(cmd->isTypingCommand());
    else {
        // Only register a new undo command if the command passed in is
        // different from the last command
        m_lastEditCommand = cmd;
        if (client())
            client()->registerCommandForUndo(m_lastEditCommand);
    }
    respondToChangedContents(newSelection);    
}

void Editor::unappliedEditing(PassRefPtr<EditCommand> cmd)
{
    dispatchEditableContentChangedEvents(*cmd);
    
    VisibleSelection newSelection(cmd->startingSelection());
    changeSelectionAfterCommand(newSelection, true, true, cmd.get());
    
    m_lastEditCommand = 0;
    if (client())
        client()->registerCommandForRedo(cmd);
    respondToChangedContents(newSelection);    
}

void Editor::reappliedEditing(PassRefPtr<EditCommand> cmd)
{
    dispatchEditableContentChangedEvents(*cmd);
    
    VisibleSelection newSelection(cmd->endingSelection());
    changeSelectionAfterCommand(newSelection, true, true, cmd.get());
    
    m_lastEditCommand = 0;
    if (client())
        client()->registerCommandForUndo(cmd);
    respondToChangedContents(newSelection);    
}

Editor::Editor(Frame* frame)
    : m_frame(frame)
    , m_deleteButtonController(new DeleteButtonController(frame))
    , m_ignoreCompositionSelectionChange(false)
    , m_shouldStartNewKillRingSequence(false)
    // This is off by default, since most editors want this behavior (this matches IE but not FF).
    , m_shouldStyleWithCSS(false)
{ 
}

Editor::~Editor()
{
}

void Editor::clear()
{
    m_compositionNode = 0;
    m_customCompositionUnderlines.clear();
    m_shouldStyleWithCSS = false;
}

bool Editor::insertText(const String& text, Event* triggeringEvent)
{
    return m_frame->eventHandler()->handleTextInputEvent(text, triggeringEvent);
}

bool Editor::insertTextWithoutSendingTextEvent(const String& text, bool selectInsertedText, Event* triggeringEvent)
{
    if (text.isEmpty())
        return false;

    VisibleSelection selection = selectionForCommand(triggeringEvent);
    if (!selection.isContentEditable())
        return false;
    RefPtr<Range> range = selection.toNormalizedRange();

    if (!shouldInsertText(text, range.get(), EditorInsertActionTyped))
        return true;

    // Get the selection to use for the event that triggered this insertText.
    // If the event handler changed the selection, we may want to use a different selection
    // that is contained in the event target.
    selection = selectionForCommand(triggeringEvent);
    if (selection.isContentEditable()) {
        if (Node* selectionStart = selection.start().node()) {
            RefPtr<Document> document = selectionStart->document();
            
            // Insert the text
            TypingCommand::insertText(document.get(), text, selection, selectInsertedText);

            // Reveal the current selection 
            if (Frame* editedFrame = document->frame())
                if (Page* page = editedFrame->page())
                    page->focusController()->focusedOrMainFrame()->revealSelection(ScrollAlignment::alignToEdgeIfNeeded);
        }
    }

    return true;
}

bool Editor::insertLineBreak()
{
    if (!canEdit())
        return false;

    if (!shouldInsertText("\n", m_frame->selection()->toNormalizedRange().get(), EditorInsertActionTyped))
        return true;

    TypingCommand::insertLineBreak(m_frame->document());
    revealSelectionAfterEditingOperation();
    return true;
}

bool Editor::insertParagraphSeparator()
{
    if (!canEdit())
        return false;

    if (!canEditRichly())
        return insertLineBreak();

    if (!shouldInsertText("\n", m_frame->selection()->toNormalizedRange().get(), EditorInsertActionTyped))
        return true;

    TypingCommand::insertParagraphSeparator(m_frame->document());
    revealSelectionAfterEditingOperation();
    return true;
}

void Editor::cut()
{
    if (tryDHTMLCut())
        return; // DHTML did the whole operation
    if (!canCut()) {
        systemBeep();
        return;
    }
    RefPtr<Range> selection = selectedRange();
    if (shouldDeleteRange(selection.get())) {
        Pasteboard::generalPasteboard()->writeSelection(selection.get(), canSmartCopyOrDelete(), m_frame);
        didWriteSelectionToPasteboard();
        deleteSelectionWithSmartDelete(canSmartCopyOrDelete());
    }
}

void Editor::copy()
{
    if (tryDHTMLCopy())
        return; // DHTML did the whole operation
    if (!canCopy()) {
        systemBeep();
        return;
    }
    
    Document* document = m_frame->document();
    if (HTMLImageElement* imageElement = imageElementFromImageDocument(document))
        Pasteboard::generalPasteboard()->writeImage(imageElement, document->url(), document->title());
    else
        Pasteboard::generalPasteboard()->writeSelection(selectedRange().get(), canSmartCopyOrDelete(), m_frame);
    
    didWriteSelectionToPasteboard();
}

#if !PLATFORM(MAC)

void Editor::paste()
{
    ASSERT(m_frame->document());
    if (tryDHTMLPaste())