q3textedit.cpp

奇趣公司比较新的qt/emd版本

                    redo();
                    break;
                case Qt::Key_K:
                    doKeyboardAction(ActionKill);
                    break;
#if defined(Q_WS_WIN)
                case Qt::Key_Insert:
                    copy();
                    break;
                case Qt::Key_Delete:
                    del();
                    break;
#endif
                default:
                    unknownKey = false;
                    break;
                }
            } else {
                unknownKey = true;
            }
        }
    }

    emit cursorPositionChanged(cursor);
    emit cursorPositionChanged(cursor->paragraph()->paragId(), cursor->index());
    if (clearUndoRedoInfo)
        clearUndoRedo();
    changeIntervalTimer->start(100, true);
    if (unknownKey)
        e->ignore();
}

/*!
    \reimp
*/
void Q3TextEdit::inputMethodEvent(QInputMethodEvent *e)
{
    if (isReadOnly()) {
        e->ignore();
        return;
    }

    if (hasSelectedText())
        removeSelectedText();
    clearUndoRedo();
    undoRedoInfo.type = UndoRedoInfo::IME;

    bool oldupdate = updatesEnabled();
    if (oldupdate)
        setUpdatesEnabled(false);
    bool sigs_blocked = signalsBlocked();
    blockSignals(true);
    const int preeditSelectionBase = 31900;
    for (int i = 0; i < d->numPreeditSelections; ++i)
        doc->removeSelection(preeditSelectionBase + i);
    d->numPreeditSelections = 0;

    if (d->preeditLength > 0 && cursor->paragraph()) {
        cursor->setIndex(d->preeditStart);
        cursor->paragraph()->remove(d->preeditStart, d->preeditLength);
        d->preeditStart = d->preeditLength = -1;
    }

    if (!e->commitString().isEmpty() || e->replacementLength()) {
        int c = cursor->index(); // cursor position after insertion of commit string
        if (e->replacementStart() <= 0)
            c += e->commitString().length() + qMin(-e->replacementStart(), e->replacementLength());
        cursor->setIndex(cursor->index() + e->replacementStart());
        doc->setSelectionStart(Q3TextDocument::Standard, *cursor);
        cursor->setIndex(cursor->index() + e->replacementLength());
        doc->setSelectionEnd(Q3TextDocument::Standard, *cursor);
        removeSelectedText();
	if (undoRedoInfo.type == UndoRedoInfo::IME)
	    undoRedoInfo.type = UndoRedoInfo::Invalid;
        insert(e->commitString());
	undoRedoInfo.type = UndoRedoInfo::IME;
        cursor->setIndex(c);
    }

    if (!e->preeditString().isEmpty()) {
        d->preeditStart = cursor->index();
        d->preeditLength = e->preeditString().length();
	insert(e->preeditString());
        cursor->setIndex(d->preeditStart);

        Q3TextCursor c = *cursor;
        for (int i = 0; i < e->attributes().size(); ++i) {
            const QInputMethodEvent::Attribute &a = e->attributes().at(i);
            if (a.type == QInputMethodEvent::Cursor)
                cursor->setIndex(cursor->index() + a.start);
            else if (a.type != QInputMethodEvent::TextFormat)
                continue;
            QTextCharFormat f = qvariant_cast<QTextFormat>(a.value).toCharFormat();
            if (f.isValid()) {
                Q3TextCursor c2 = c;
                c2.setIndex(c.index() + a.start);
                doc->setSelectionStart(preeditSelectionBase + d->numPreeditSelections, c2);
                c2.setIndex(c.index() + a.start + a.length);
                doc->setSelectionEnd(preeditSelectionBase + d->numPreeditSelections, c2);

                QColor c = f.hasProperty(QTextFormat::BackgroundBrush) ? f.background().color() : QColor();
                doc->setSelectionColor(preeditSelectionBase + d->numPreeditSelections, c);
                c = f.hasProperty(QTextFormat::ForegroundBrush) ? f.foreground().color() : QColor();
                doc->setSelectionTextColor(preeditSelectionBase + d->numPreeditSelections, c);
                if (f.fontUnderline()) {
                    Q3TextParagraph *par = cursor->paragraph();
                    Q3TextFormat f(*par->string()->at(d->preeditStart).format());
                    f.setUnderline(true);
                    Q3TextFormat *f2 = doc->formatCollection()->format(&f);
                    par->setFormat(d->preeditStart + a.start, a.length, f2);
                }
                ++d->numPreeditSelections;
            }
	}
    } else {
	undoRedoInfo.type = UndoRedoInfo::Invalid;
    }
    blockSignals(sigs_blocked);
    if (oldupdate)
        setUpdatesEnabled(true);
    if (!e->commitString().isEmpty())
        emit textChanged();
    repaintChanged();
}


static bool qtextedit_ignore_readonly = false;

/*!
    Executes keyboard action \a action. This is normally called by a
    key event handler.
*/

void Q3TextEdit::doKeyboardAction(Q3TextEdit::KeyboardAction action)
{
    if (isReadOnly() && !qtextedit_ignore_readonly)
        return;

    if (cursor->nestedDepth() != 0)
        return;

    lastFormatted = cursor->paragraph();
    drawCursor(false);
    bool doUpdateCurrentFormat = true;

    switch (action) {
    case ActionWordDelete:
    case ActionDelete:
        if (action == ActionDelete && !cursor->atParagEnd()) {
            if (undoEnabled) {
                checkUndoRedoInfo(UndoRedoInfo::Delete);
                if (!undoRedoInfo.valid()) {
                    undoRedoInfo.id = cursor->paragraph()->paragId();
                    undoRedoInfo.index = cursor->index();
                    undoRedoInfo.d->text.clear();
                }
                int idx = cursor->index();
                do {
                    undoRedoInfo.d->text.insert(undoRedoInfo.d->text.length(), cursor->paragraph()->at(idx++), true);
                } while (!cursor->paragraph()->string()->validCursorPosition(idx));
            }
            cursor->remove();
        } else {
            clearUndoRedo();
            doc->setSelectionStart(Q3TextDocument::Temp, *cursor);
            if (action == ActionWordDelete && !cursor->atParagEnd()) {
                cursor->gotoNextWord();
            } else {
                cursor->gotoNextLetter();
            }
            doc->setSelectionEnd(Q3TextDocument::Temp, *cursor);
            removeSelectedText(Q3TextDocument::Temp);
        }
        break;
    case ActionWordBackspace:
    case ActionBackspace:
        if (textFormat() == Qt::RichText
             && (cursor->paragraph()->isListItem()
                 || cursor->paragraph()->listDepth())
             && cursor->index() == 0) {
            if (undoEnabled) {
                clearUndoRedo();
                undoRedoInfo.type = UndoRedoInfo::Style;
                undoRedoInfo.id = cursor->paragraph()->paragId();
                undoRedoInfo.eid = undoRedoInfo.id;
                undoRedoInfo.styleInformation = Q3TextStyleCommand::readStyleInformation(doc, undoRedoInfo.id, undoRedoInfo.eid);
            }
            int ldepth = cursor->paragraph()->listDepth();
            if (cursor->paragraph()->isListItem() && ldepth == 1) {
                cursor->paragraph()->setListItem(false);
            } else if (qMax(ldepth, 1) == 1) {
                cursor->paragraph()->setListItem(false);
                cursor->paragraph()->setListDepth(0);
            } else {
                cursor->paragraph()->setListDepth(ldepth - 1);
            }
            clearUndoRedo();
            lastFormatted = cursor->paragraph();
            repaintChanged();
            drawCursor(true);
            return;
        }

        if (action == ActionBackspace && !cursor->atParagStart()) {
            if (undoEnabled) {
                checkUndoRedoInfo(UndoRedoInfo::Delete);
                if (!undoRedoInfo.valid()) {
                    undoRedoInfo.id = cursor->paragraph()->paragId();
                    undoRedoInfo.index = cursor->index();
                    undoRedoInfo.d->text.clear();
                }
                undoRedoInfo.d->text.insert(0, cursor->paragraph()->at(cursor->index()-1), true);
                undoRedoInfo.index = cursor->index()-1;
            }
            cursor->removePreviousChar();
            lastFormatted = cursor->paragraph();
        } else if (cursor->paragraph()->prev()
                    || (action == ActionWordBackspace
                        && !cursor->atParagStart())) {
            clearUndoRedo();
            doc->setSelectionStart(Q3TextDocument::Temp, *cursor);
            if (action == ActionWordBackspace && !cursor->atParagStart()) {
                cursor->gotoPreviousWord();
            } else {
                cursor->gotoPreviousLetter();
            }
            doc->setSelectionEnd(Q3TextDocument::Temp, *cursor);
            removeSelectedText(Q3TextDocument::Temp);
        }
        break;
    case ActionReturn:
        if (undoEnabled) {
            checkUndoRedoInfo(UndoRedoInfo::Return);
            if (!undoRedoInfo.valid()) {
                undoRedoInfo.id = cursor->paragraph()->paragId();
                undoRedoInfo.index = cursor->index();
                undoRedoInfo.d->text.clear();
            }
            undoRedoInfo.d->text += QString(QLatin1Char('\n'));
        }
        cursor->splitAndInsertEmptyParagraph();
        if (cursor->paragraph()->prev()) {
            lastFormatted = cursor->paragraph()->prev();
            lastFormatted->invalidate(0);
        }
        doUpdateCurrentFormat = false;
        break;
    case ActionKill:
        clearUndoRedo();
        doc->setSelectionStart(Q3TextDocument::Temp, *cursor);
        if (cursor->atParagEnd())
            cursor->gotoNextLetter();
        else
            cursor->setIndex(cursor->paragraph()->length() - 1);
        doc->setSelectionEnd(Q3TextDocument::Temp, *cursor);
        removeSelectedText(Q3TextDocument::Temp);
        break;
    }

    formatMore();
    repaintChanged();
    ensureCursorVisible();
    drawCursor(true);
    if (doUpdateCurrentFormat)
        updateCurrentFormat();
    setModified();
    emit textChanged();
}

void Q3TextEdit::readFormats(Q3TextCursor &c1, Q3TextCursor &c2, Q3TextString &text, bool fillStyles)
{
#ifndef QT_NO_DATASTREAM
    QDataStream styleStream(&undoRedoInfo.styleInformation, IO_WriteOnly);
#endif
    c2.restoreState();
    c1.restoreState();
    int lastIndex = text.length();
    if (c1.paragraph() == c2.paragraph()) {
        for (int i = c1.index(); i < c2.index(); ++i)
            text.insert(lastIndex + i - c1.index(), c1.paragraph()->at(i), true);
#ifndef QT_NO_DATASTREAM
        if (fillStyles) {
            styleStream << (int) 1;
            c1.paragraph()->writeStyleInformation(styleStream);
        }
#endif
    } else {
        int i;
        for (i = c1.index(); i < c1.paragraph()->length()-1; ++i)
            text.insert(lastIndex++, c1.paragraph()->at(i), true);
        int num = 2; // start and end, being different
        text += QString(QLatin1Char('\n')); lastIndex++;

        if (c1.paragraph()->next() != c2.paragraph()) {
            num += text.appendParagraphs(c1.paragraph()->next(), c2.paragraph());
            lastIndex = text.length();
        }

        for (i = 0; i < c2.index(); ++i)
            text.insert(i + lastIndex, c2.paragraph()->at(i), true);
#ifndef QT_NO_DATASTREAM
        if (fillStyles) {
            styleStream << num;
            for (Q3TextParagraph *p = c1.paragraph(); --num >= 0; p = p->next())
                p->writeStyleInformation(styleStream);
        }
#endif
    }
}

/*!
    Removes the selection \a selNum (by default 0). This does not
    remove the selected text.

    \sa removeSelectedText()
*/

void Q3TextEdit::removeSelection(int selNum)
{
    doc->removeSelection(selNum);
    repaintChanged();
}

/*!
    Deletes the text of selection \a selNum (by default, the default
    selection, 0). If there is no selected text nothing happens.

    \sa selectedText removeSelection()
*/

void Q3TextEdit::removeSelectedText(int selNum)
{
    Q3TextCursor c1 = doc->selectionStartCursor(selNum);
    c1.restoreState();
    Q3TextCursor c2 = doc->selectionEndCursor(selNum);
    c2.restoreState();

    // ### no support for editing tables yet, plus security for broken selections
    if (c1.nestedDepth() || c2.nestedDepth())
        return;

    for (int i = 0; i < (int)doc->numSelections(); ++i) {
        if (i == selNum)
            continue;
        doc->removeSelection(i);
    }

    drawCursor(false);
    if (undoEnabled) {
        checkUndoRedoInfo(UndoRedoInfo::RemoveSelected);
        if (!undoRedoInfo.valid()) {
            doc->selectionStart(selNum, undoRedoInfo.id, undoRedoInfo.index);
            undoRedoInfo.d->text.clear();
        }
        readFormats(c1, c2, undoRedoInfo.d->text, true);
    }

    doc->removeSelectedText(selNum, cursor);
    if (cursor->isValid()) {
        lastFormatted = 0; // make sync a noop
        ensureCursorVisible();
        lastFormatted = cursor->paragraph();
        formatMore();
        repaintContents();
        ensureCursorVisible();
        drawCursor(true);
        clearUndoRedo();
#if defined(Q_WS_WIN)