q3richtext.cpp

奇趣公司比较新的qt/emd版本

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#include "q3richtext_p.h"

#ifndef QT_NO_RICHTEXT

#include "qbitmap.h"
#include "qapplication.h"
#include "q3cleanuphandler.h"
#include "qcursor.h"
#include "qdatastream.h"
#include "q3dragobject.h"
#include "qdrawutil.h"
#include "qfile.h"
#include "qfileinfo.h"
#include "qfont.h"
#include "qimage.h"
#include "qmap.h"
#include "qmime.h"
#include "q3paintdevicemetrics.h"
#include "qpainter.h"
#include "qstringlist.h"
#include "qstyle.h"
#include "qstyleoption.h"
#include "q3stylesheet.h"
#include "qtextstream.h"
#include <private/qtextengine_p.h>
#include <private/qunicodetables_p.h>

#include <stdlib.h>

#if defined(Q_WS_X11)
#include "qx11info_x11.h"
#endif

static Q3TextCursor* richTextExportStart = 0;
static Q3TextCursor* richTextExportEnd = 0;

class Q3TextFormatCollection;

const int border_tolerance = 2;

#ifdef Q_WS_WIN
#include "qt_windows.h"
#endif

static inline bool is_printer(QPainter *p)
{
    if (!p || !p->device())
        return false;
    return p->device()->devType() == QInternal::Printer;
}

static inline int scale(int value, QPainter *painter)
{
    if (is_printer(painter)) {
        Q3PaintDeviceMetrics metrics(painter->device());
#if defined(Q_WS_X11)
        value = value * metrics.logicalDpiY() /
                QX11Info::appDpiY(painter->device()->x11Screen());
#elif defined (Q_WS_WIN)
        HDC hdc = GetDC(0);
        int gdc = GetDeviceCaps(hdc, LOGPIXELSY);
        if (gdc)
            value = value * metrics.logicalDpiY() / gdc;
        ReleaseDC(0, hdc);
#elif defined (Q_WS_MAC)
        value = value * metrics.logicalDpiY() / 75; // ##### FIXME
#elif defined (Q_WS_QWS)
        value = value * metrics.logicalDpiY() / 75;
#endif
    }
    return value;
}


static inline bool isBreakable(Q3TextString *string, int pos)
{
    if (string->at(pos).nobreak)
        return false;
    return (pos < string->length()-1 && string->at(pos+1).softBreak);
}

// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

void Q3TextCommandHistory::addCommand(Q3TextCommand *cmd)
{
    if (current < history.count() - 1) {
        QList<Q3TextCommand *> commands;

        for (int i = 0; i <= current; ++i)
            commands.insert(i, history.takeFirst());

        commands.append(cmd);
        while (!history.isEmpty())
            delete history.takeFirst();
        history = commands;
    } else {
        history.append(cmd);
    }

    if (history.count() > steps)
        delete history.takeFirst();
    else
        ++current;
}

Q3TextCursor *Q3TextCommandHistory::undo(Q3TextCursor *c)
{
    if (current > -1) {
        Q3TextCursor *c2 = history.at(current)->unexecute(c);
        --current;
        return c2;
    }
    return 0;
}

Q3TextCursor *Q3TextCommandHistory::redo(Q3TextCursor *c)
{
    if (current > -1) {
        if (current < history.count() - 1) {
            ++current;
            return history.at(current)->execute(c);
        }
    } else {
        if (history.count() > 0) {
            ++current;
            return history.at(current)->execute(c);
        }
    }
    return 0;
}

bool Q3TextCommandHistory::isUndoAvailable()
{
    return current > -1;
}

bool Q3TextCommandHistory::isRedoAvailable()
{
   return current > -1 && current < history.count() - 1 || current == -1 && history.count() > 0;
}

// +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

Q3TextDeleteCommand::Q3TextDeleteCommand(Q3TextDocument *dc, int i, int idx, const QVector<Q3TextStringChar> &str,
                                        const QByteArray& oldStyleInfo)
    : Q3TextCommand(dc), id(i), index(idx), parag(0), text(str), styleInformation(oldStyleInfo)
{
    for (int j = 0; j < (int)text.size(); ++j) {
        if (text[j].format())
            text[j].format()->addRef();
    }
}

Q3TextDeleteCommand::Q3TextDeleteCommand(Q3TextParagraph *p, int idx, const QVector<Q3TextStringChar> &str)
    : Q3TextCommand(0), id(-1), index(idx), parag(p), text(str)
{
    for (int i = 0; i < (int)text.size(); ++i) {
        if (text[i].format())
            text[i].format()->addRef();
    }
}

Q3TextDeleteCommand::~Q3TextDeleteCommand()
{
    for (int i = 0; i < (int)text.size(); ++i) {
        if (text[i].format())
            text[i].format()->removeRef();
    }
    text.resize(0);
}

Q3TextCursor *Q3TextDeleteCommand::execute(Q3TextCursor *c)
{
    Q3TextParagraph *s = doc ? doc->paragAt(id) : parag;
    if (!s) {
        qWarning("can't locate parag at %d, last parag: %d", id, doc->lastParagraph()->paragId());
        return 0;
    }

    cursor.setParagraph(s);
    cursor.setIndex(index);
    int len = text.size();
    if (c)
        *c = cursor;
    if (doc) {
        doc->setSelectionStart(Q3TextDocument::Temp, cursor);
        for (int i = 0; i < len; ++i)
            cursor.gotoNextLetter();
        doc->setSelectionEnd(Q3TextDocument::Temp, cursor);
        doc->removeSelectedText(Q3TextDocument::Temp, &cursor);
        if (c)
            *c = cursor;
    } else {
        s->remove(index, len);
    }

    return c;
}

Q3TextCursor *Q3TextDeleteCommand::unexecute(Q3TextCursor *c)
{
    Q3TextParagraph *s = doc ? doc->paragAt(id) : parag;
    if (!s) {
        qWarning("can't locate parag at %d, last parag: %d", id, doc->lastParagraph()->paragId());
        return 0;
    }

    cursor.setParagraph(s);
    cursor.setIndex(index);
    QString str = Q3TextString::toString(text);
    cursor.insert(str, true, &text);
    if (c)
        *c = cursor;
    cursor.setParagraph(s);
    cursor.setIndex(index);

#ifndef QT_NO_DATASTREAM
    if (!styleInformation.isEmpty()) {
        QDataStream styleStream(&styleInformation, IO_ReadOnly);
        int num;
        styleStream >> num;
        Q3TextParagraph *p = s;
        while (num-- && p) {
            p->readStyleInformation(styleStream);
            p = p->next();
        }
    }
#endif
    s = cursor.paragraph();
    while (s) {
        s->format();
        s->setChanged(true);
        if (s == c->paragraph())
            break;
        s = s->next();
    }

    return &cursor;
}

Q3TextFormatCommand::Q3TextFormatCommand(Q3TextDocument *dc, int sid, int sidx, int eid, int eidx,
                                        const QVector<Q3TextStringChar> &old, Q3TextFormat *f, int fl)
    : Q3TextCommand(dc), startId(sid), startIndex(sidx), endId(eid), endIndex(eidx), format(f), oldFormats(old), flags(fl)
{
    format = dc->formatCollection()->format(f);
    for (int j = 0; j < (int)oldFormats.size(); ++j) {
        if (oldFormats[j].format())
            oldFormats[j].format()->addRef();
    }
}

Q3TextFormatCommand::~Q3TextFormatCommand()
{
    format->removeRef();
    for (int j = 0; j < (int)oldFormats.size(); ++j) {
        if (oldFormats[j].format())
            oldFormats[j].format()->removeRef();
    }
}

Q3TextCursor *Q3TextFormatCommand::execute(Q3TextCursor *c)
{
    Q3TextParagraph *sp = doc->paragAt(startId);
    Q3TextParagraph *ep = doc->paragAt(endId);
    if (!sp || !ep)
        return c;

    Q3TextCursor start(doc);
    start.setParagraph(sp);
    start.setIndex(startIndex);
    Q3TextCursor end(doc);
    end.setParagraph(ep);
    end.setIndex(endIndex);

    doc->setSelectionStart(Q3TextDocument::Temp, start);
    doc->setSelectionEnd(Q3TextDocument::Temp, end);
    doc->setFormat(Q3TextDocument::Temp, format, flags);
    doc->removeSelection(Q3TextDocument::Temp);
    if (endIndex == ep->length())
        end.gotoLeft();
    *c = end;
    return c;
}

Q3TextCursor *Q3TextFormatCommand::unexecute(Q3TextCursor *c)
{
    Q3TextParagraph *sp = doc->paragAt(startId);
    Q3TextParagraph *ep = doc->paragAt(endId);
    if (!sp || !ep)
        return 0;

    int idx = startIndex;
    int fIndex = 0;
    while ( fIndex < int(oldFormats.size()) ) {
        if (oldFormats.at(fIndex).c == QLatin1Char('\n')) {
            if (idx > 0) {
                if (idx < sp->length() && fIndex > 0)
                    sp->setFormat(idx, 1, oldFormats.at(fIndex - 1).format());
                if (sp == ep)
                    break;
                sp = sp->next();
                idx = 0;
            }
            fIndex++;
        }
        if (oldFormats.at(fIndex).format())
            sp->setFormat(idx, 1, oldFormats.at(fIndex).format());
        idx++;
        fIndex++;
        if (fIndex >= (int)oldFormats.size())
            break;
        if (idx >= sp->length()) {
            if (sp == ep)
                break;
            sp = sp->next();
            idx = 0;
        }
    }

    Q3TextCursor end(doc);
    end.setParagraph(ep);
    end.setIndex(endIndex);
    if (endIndex == ep->length())
        end.gotoLeft();
    *c = end;
    return c;
}

Q3TextStyleCommand::Q3TextStyleCommand(Q3TextDocument *dc, int fParag, int lParag, const QByteArray& beforeChange)
    : Q3TextCommand(dc), firstParag(fParag), lastParag(lParag), before(beforeChange)
{
    after = readStyleInformation( dc, fParag, lParag);
}


QByteArray Q3TextStyleCommand::readStyleInformation( Q3TextDocument* doc, int fParag, int lParag)
{
    QByteArray style;
#ifndef QT_NO_DATASTREAM
    Q3TextParagraph *p = doc->paragAt(fParag);
    if (!p)
        return style;
    QDataStream styleStream(&style, IO_WriteOnly);
    int num = lParag - fParag + 1;
    styleStream << num;
    while (num -- && p) {
        p->writeStyleInformation(styleStream);
        p = p->next();
    }
#endif
    return style;
}

void Q3TextStyleCommand::writeStyleInformation( Q3TextDocument* doc, int fParag, const QByteArray& style)
{
#ifndef QT_NO_DATASTREAM
    Q3TextParagraph *p = doc->paragAt(fParag);
    if (!p)
        return;
    QByteArray copy = style;
    QDataStream styleStream(&copy, IO_ReadOnly);
    int num;
    styleStream >> num;
    while (num-- && p) {
        p->readStyleInformation(styleStream);
        p = p->next();
    }
#endif