qlineedit.cpp

qt-x11-opensource-src-4.1.4.tar.gz源码

    }

    if (unknown)
        event->ignore();
    else
        event->accept();
}

/*!
  This function is not intended as polymorphic usage. Just a shared code
  fragment that calls QInputContext::mouseHandler for this
  class.
*/
bool QLineEditPrivate::sendMouseEventToInputContext( QMouseEvent *e )
{
#if !defined QT_NO_IM
    Q_Q(QLineEdit);
    if ( composeMode() ) {
	int tmp_cursor = xToPos(e->pos().x());
	int mousePos = tmp_cursor - cursor;
	if ( mousePos < 0 || mousePos > textLayout.preeditAreaText().length() ) {
            mousePos = -1;
	    // don't send move events outside the preedit area
            if ( e->type() == QEvent::MouseMove )
                return true;
        }

        QInputContext *qic = q->inputContext();
        if ( qic )
            // may be causing reset() in some input methods
            qic->mouseHandler(mousePos, e);
        if (!textLayout.preeditAreaText().isEmpty())
            return true;
    }
#else
    Q_UNUSED(e);
#endif

    return false;
}

/*! \reimp
 */
void QLineEdit::inputMethodEvent(QInputMethodEvent *e)
{
    Q_D(QLineEdit);
    if (d->readOnly) {
        e->ignore();
        return;
    }

#ifdef Q_WS_QWS
    if(echoMode() == PasswordEchoOnEdit)
    {
        setEchoMode(Normal);
        clear();
        d->resumePassword = true;
    }
#endif

#ifdef QT_KEYPAD_NAVIGATION
    if (QApplication::keypadNavigationEnabled() && !hasEditFocus())
        setEditFocus(true);
#endif

    int priorState = d->undoState;
    d->removeSelectedText();

    int c = d->cursor; // cursor position after insertion of commit string
    if (e->replacementStart() <= 0)
        c += e->commitString().length() + qMin(-e->replacementStart(), e->replacementLength());

    d->cursor += e->replacementStart();

    // insert commit string
    if (e->replacementLength()) {
        d->selstart = d->cursor;
        d->selend = d->selstart + e->replacementLength();
        d->removeSelectedText();
    }
    if (!e->commitString().isEmpty())
        d->insert(e->commitString());

    d->cursor = c;

    d->textLayout.setPreeditArea(d->cursor, e->preeditString());
    d->preeditCursor = e->preeditString().length();
    d->hideCursor = false;
    QList<QTextLayout::FormatRange> formats;
    for (int i = 0; i < e->attributes().size(); ++i) {
        const QInputMethodEvent::Attribute &a = e->attributes().at(i);
        if (a.type == QInputMethodEvent::Cursor) {
            d->preeditCursor = a.start;
            d->hideCursor = !a.length;
        } else if (a.type == QInputMethodEvent::TextFormat) {
            QTextCharFormat f = qvariant_cast<QTextFormat>(a.value).toCharFormat();
            if (f.isValid()) {
                QTextLayout::FormatRange o;
                o.start = a.start + d->cursor;
                o.length = a.length;
                o.format = f;
                formats.append(o);
            }
        }
    }
    d->textLayout.setAdditionalFormats(formats);
    d->updateTextLayout();
    update();
    if (!e->commitString().isEmpty())
        d->emitCursorPositionChanged();
    d->finishChange(priorState);
}

/*!\reimp
*/
QVariant QLineEdit::inputMethodQuery(Qt::InputMethodQuery property) const
{
    Q_D(const QLineEdit);
    switch(property) {
    case Qt::ImMicroFocus:
        return d->cursorRect();
    case Qt::ImFont:
        return font();
    case Qt::ImCursorPosition:
        return QVariant(d->cursor);
    case Qt::ImSurroundingText:
        return QVariant(d->text);
    case Qt::ImCurrentSelection:
        return QVariant(selectedText());
    default:
        return QVariant();
    }
}

/*!\reimp
*/

void QLineEdit::focusInEvent(QFocusEvent *e)
{
    Q_D(QLineEdit);
    if (e->reason() == Qt::TabFocusReason ||
         e->reason() == Qt::BacktabFocusReason  ||
         e->reason() == Qt::ShortcutFocusReason)
        if (d->maskData)
            d->moveCursor(d->nextMaskBlank(0));
        else if (!d->hasSelectedText())
            selectAll();
    if (!d->cursorTimer) {
        int cft = QApplication::cursorFlashTime();
        d->cursorTimer = cft ? startTimer(cft/2) : -1;
    }
    QStyleOptionFrame opt = d->getStyleOption();
    if((!hasSelectedText() && d->textLayout.preeditAreaText().isEmpty())
       || style()->styleHint(QStyle::SH_BlinkCursorWhenTextSelected, &opt, this))
        d->setCursorVisible(true);
#ifdef Q_WS_MAC
    if (d->echoMode == Password || d->echoMode == NoEcho)
        qt_mac_secure_keyboard(true);
#endif
#ifdef QT_KEYPAD_NAVIGATION
    d->origText = d->text;
#endif
    update();
}

/*!\reimp
*/

void QLineEdit::focusOutEvent(QFocusEvent *e)
{
    Q_D(QLineEdit);

#ifdef Q_WS_QWS
    if(d->resumePassword){
        setEchoMode(PasswordEchoOnEdit);
        d->resumePassword = false;
    }
#endif

    Qt::FocusReason reason = e->reason();
    if (reason != Qt::ActiveWindowFocusReason &&
        reason != Qt::PopupFocusReason)
        deselect();

    d->setCursorVisible(false);
    if (d->cursorTimer > 0)
        killTimer(d->cursorTimer);
    d->cursorTimer = 0;
    if (reason != Qt::PopupFocusReason
        && !(QApplication::activePopupWidget() && QApplication::activePopupWidget()->parentWidget() == this)) {
        if (!d->emitingEditingFinished)
            emit editingFinished();
#ifdef QT3_SUPPORT
        emit lostFocus();
#endif
    }
#ifdef Q_WS_MAC
    if (d->echoMode == Password || d->echoMode == NoEcho)
        qt_mac_secure_keyboard(false);
#endif
#ifdef QT_KEYPAD_NAVIGATION
    d->origText = QString();
#endif
    update();
}

/*!\reimp
*/
void QLineEdit::paintEvent(QPaintEvent *)
{
    Q_D(QLineEdit);
    QPainter p(this);

    QRect r = rect();
    const QPalette &pal = palette();

    QStyleOptionFrame panel = d->getStyleOption();
    style()->drawPrimitive(QStyle::PE_PanelLineEdit, &panel, &p, this);

    if (d->frame) {
        int frameWidth = panel.lineWidth;
        r.adjust(frameWidth, frameWidth, -frameWidth, -frameWidth);
        p.setClipRect(r);
    }

    QFontMetrics fm = fontMetrics();
    QRect lineRect(r.x() + horizontalMargin, r.y() + (r.height() - fm.height() + 1) / 2,
                    r.width() - 2*horizontalMargin, fm.height());
    QTextLine line = d->textLayout.lineAt(0);

    int cursor = d->cursor;
    if (d->preeditCursor != -1)
        cursor += d->preeditCursor;
    // locate cursor position
    int cix = qRound(line.cursorToX(cursor));

    // horizontal scrolling
    int minLB = qMax(0, -fm.minLeftBearing());
    int minRB = qMax(0, -fm.minRightBearing());


    int widthUsed = qRound(line.naturalTextWidth()) + 1 + minRB;
    if ((minLB + widthUsed) <=  lineRect.width()) {
        Qt::Alignment va = QStyle::visualAlignment(layoutDirection(), QFlag(d->alignment));
        va &= ~(Qt::AlignAbsolute|Qt::AlignVertical_Mask);
        switch (va) {
        case Qt::AlignRight:
            d->hscroll = widthUsed - lineRect.width() + 1;
            break;
        case Qt::AlignHCenter:
            d->hscroll = (widthUsed - lineRect.width()) / 2;
            break;
        default:
            // Left
            d->hscroll = 0;
            break;
        }
        d->hscroll -= minLB;
    } else if (cix - d->hscroll >= lineRect.width()) {
        d->hscroll = cix - lineRect.width() + 1;
    } else if (cix - d->hscroll < 0) {
        d->hscroll = cix;
    } else if (widthUsed - d->hscroll < lineRect.width()) {
        d->hscroll = widthUsed - lineRect.width() + 1;
    }
    // the y offset is there to keep the baseline constant in case we have script changes in the text.
    QPoint topLeft = lineRect.topLeft() - QPoint(d->hscroll, d->ascent-fm.ascent());

    // draw text, selections and cursors
    p.setPen(pal.text().color());

    QVector<QTextLayout::FormatRange> selections;
    if (d->selstart < d->selend || (d->cursorVisible && d->maskData)) {
        QTextLayout::FormatRange o;
        const QPalette &pal = palette();
        if (d->selstart < d->selend) {
            o.start = d->selstart;
            o.length = d->selend - d->selstart;
            o.format.setBackground(pal.brush(QPalette::Highlight));
            o.format.setForeground(pal.brush(QPalette::HighlightedText));
        } else {
            // mask selection
            o.start = d->cursor;
            o.length = 1;
            o.format.setBackground(pal.brush(QPalette::Text));
            o.format.setForeground(pal.brush(QPalette::Background));
        }
        selections.append(o);
    }

    // Asian users see an IM selection text as cursor on candidate
    // selection phase of input method, so the ordinary cursor should be
    // invisible if we have a preedit string.
    d->textLayout.draw(&p, topLeft, selections, r);
    if (d->cursorVisible && !d->readOnly && !d->hideCursor)
        d->textLayout.drawCursor(&p, topLeft, cursor);

}


#ifndef QT_NO_DRAGANDDROP
/*!\reimp
*/
void QLineEdit::dragMoveEvent(QDragMoveEvent *e)
{
    Q_D(QLineEdit);
    if (!d->readOnly && e->mimeData()->hasFormat("text/plain")) {
        e->acceptProposedAction();
        d->cursor = d->xToPos(e->pos().x());
        d->cursorVisible = true;
        update();
        d->emitCursorPositionChanged();
    }
}

/*!\reimp */
void QLineEdit::dragEnterEvent(QDragEnterEvent * e)
{
    QLineEdit::dragMoveEvent(e);
}

/*!\reimp */
void QLineEdit::dragLeaveEvent(QDragLeaveEvent *)
{
    Q_D(QLineEdit);
    if (d->cursorVisible) {
        d->cursorVisible = false;
        update();
    }
}

/*!\reimp */
void QLineEdit::dropEvent(QDropEvent* e)
{
    Q_D(QLineEdit);
    QString str = e->mimeData()->text();

    if (!str.isNull() && !d->readOnly) {
        if (e->source() == this && e->dropAction() == Qt::CopyAction)
            deselect();
        d->cursor =d->xToPos(e->pos().x());
        int selStart = d->cursor;
        int oldSelStart = d->selstart;
        int oldSelEnd = d->selend;
        d->cursorVisible = false;
        e->acceptProposedAction();
        insert(str);
        if (e->source() == this) {
            if (e->dropAction() == Qt::MoveAction) {
                if (selStart > oldSelStart && selStart <= oldSelEnd)
                    setSelection(oldSelStart, str.length());
                else if (selStart > oldSelEnd)
                    setSelection(selStart - str.length(), str.length());
                else
                    setSelection(selStart, str.length());
            } else {
                setSelection(selStart, str.length());
            }
        }
    } else {
        e->ignore();
        update();
    }
}

void QLineEditPrivate::drag()
{
    Q_Q(QLineEdit);
    dndTimer.stop();
    QMimeData *data = new QMimeData;
    data->setText(q->selectedText());
    QDrag *drag = new QDrag(q);
    drag->setMimeData(data);
    Qt::DropAction action = drag->start();
    if (action == Qt::MoveAction && !readOnly && drag->target() != q) {
        int priorState = undoState;
        removeSelectedText();
        finishChange(priorState);
    }
}

#endif // QT_NO_DRAGANDDROP

#ifndef QT_NO_MENU
/*!
    Shows the standard context menu created with
    createStandardContextMenu().

    If you do not want the line edit to have a context menu, you can set
    its \l contextMenuPolicy to Qt::NoContextMenu. If you want to
    customize the context menu, reimplement this function. If you want
    to extend the standard context menu, reimplement this function, call
    createStandardContextMenu() and extend the menu returned.

    \code
        void LineEdit::contextMenuEvent(QContextMenuEvent *event)
        {
            QMenu *menu = createStandardContextMenu();
            menu->addAction(tr("My Menu Item"));
            //...
            menu->exec(event->globalPos());
            delete menu;
        }
    \endcode

    The \a event parameter is used to obtain the position where
    the mouse cursor was when the event was generated.

    \sa setContextMenuPolicy()
*/
void QLineEdit::contextMenuEvent(QContextMenuEvent *event)
{
    QPointer<QMenu> menu = createStandardContextMenu();
    menu->exec(event->globalPos());
    delete menu;
}

/*!  This function creates the standard context menu which is shown
  when the user clicks on the line edit with the right mouse
  button. It is called from the default contextMenuEvent() handler.
  The popup menu's ownership is transferred to the caller.
*/

QMenu *QLineEdit::createStandardContextMenu()
{
    Q_D(QLineEdit);
    d->actions[QLineEditPrivate::UndoAct]->setEnabled(d->isUndoAvailable());
    d->actions[QLineEditPrivate::RedoAct]->setEnabled(d->isRedoAvailable());
#ifndef QT_NO_CLIPBOARD
    d->actions[QLineEditPrivate::CutAct]->setEnabled(!d->readOnly && d->hasSelectedText());
    d->actions[QLineEditPrivate::CopyAct]->setEnabled(d->hasSelectedText());
    d->actions[QLineEditPrivate::PasteAct]->setEnabled(!d->readOnly && !QApplication::clipboard()->text().isEmpty());
#else
    d->actions[QLineEditPrivate::CutAct]->setEnabled(false);
    d->actions[QLineEditPrivate::CopyAct]->setEnabled(false);
    d->actions[QLineEditPrivate::PasteAct]->setEnabled(false);
#endif
    d->actions[QLineEditPrivate::ClearAct]->setEnabled(!d->readOnly && !d->text.isEmpty() && d->hasSelectedText());
    d->actions[QLineEditPrivate::SelectAllAct]->setEnabled(!d->text.isEmpty() && !d->allSelected());

    QMenu *popup = new QMenu(this);
    popup->setObjectName(QLatin1String("qt_edit_menu"));
    popup->addAction(d->actions[QLineEditPrivate::UndoAct]);
    popup->addAction(d->actions[QLineEditPrivate::RedoAct]);
    popup->addSeparator();
    popup->addAction(d->actions[QLineEditPrivate::CutAct]);
    popup->addAction(d->actions[QLineEditPrivate::CopyAct]);
    popup->addAction(d->actions[QLineEditPrivate::PasteAct]);
    popup->addAction(d->actions[QLineEditPrivate::ClearAct]);
    popup->addSeparator();
    popup->addAction(d->actions[QLineEditPrivate::SelectAllAct]);
#if !defined(QT_NO_IM)
    QInputContext *qic = inputContext();
    if (qic) {
        QList<QAction *> imActions = qic->actions();
        for (int i = 0; i < imActions.size(); ++i)
            popup->addAction(imActions.at(i));
    }
#endif
    if (!d->readOnly) {