qdrawutil.cpp

奇趣公司比较新的qt/emd版本

    p->drawLines(lines);
    if (fill)                                // fill with fill color
        p->fillRect(x+lineWidth, y+lineWidth, w-lineWidth*2, h-lineWidth*2, *fill);
    p->setPen(oldPen);                        // restore pen
}


/*!
  \internal
  This function draws a rectangle with two pixel line width.
  It is called from qDrawWinButton() and qDrawWinPanel().

  c1..c4 and fill are used:

    1 1 1 1 1 2
    1 3 3 3 4 2
    1 3 F F 4 2
    1 3 F F 4 2
    1 4 4 4 4 2
    2 2 2 2 2 2
*/

static void qDrawWinShades(QPainter *p,
                           int x, int y, int w, int h,
                           const QColor &c1, const QColor &c2,
                           const QColor &c3, const QColor &c4,
                           const QBrush *fill)
{
    if (w < 2 || h < 2)                        // can't do anything with that
        return;
    QPen oldPen = p->pen();
    QPoint a[3] = { QPoint(x, y+h-2), QPoint(x, y), QPoint(x+w-2, y) };
    p->setPen(c1);
    p->drawPolyline(a, 3);
    QPoint b[3] = { QPoint(x, y+h-1), QPoint(x+w-1, y+h-1), QPoint(x+w-1, y) };
    p->setPen(c2);
    p->drawPolyline(b, 3);
    if (w > 4 && h > 4) {
        QPoint c[3] = { QPoint(x+1, y+h-3), QPoint(x+1, y+1), QPoint(x+w-3, y+1) };
        p->setPen(c3);
        p->drawPolyline(c, 3);
        QPoint d[3] = { QPoint(x+1, y+h-2), QPoint(x+w-2, y+h-2), QPoint(x+w-2, y+1) };
        p->setPen(c4);
        p->drawPolyline(d, 3);
        if (fill)
            p->fillRect(QRect(x+2, y+2, w-4, h-4), *fill);
    }
    p->setPen(oldPen);
}


/*!
    \fn void qDrawWinButton(QPainter *painter, int x, int y, int width, int height,
                     const QPalette &palette, bool sunken,
                     const QBrush *fill)
    \relates QPainter

    Draws the Windows-style button specified by the given point (\a x,
    \a y}, \a width and \a height using the provided \a painter with a
    line width of 2 pixels. The button's interior is filled with the
    \a{fill} brush unless \a fill is 0.

    The given \a palette specifies the shading colors (\l
    {QPalette::light()}{light}, \l {QPalette::dark()}{dark} and \l
    {QPalette::mid()}{middle} colors).

    The button appears sunken if \a sunken is true, otherwise raised.

    \warning This function does not look at QWidget::style() or
    QApplication::style()-> Use the drawing functions in QStyle to make
    widgets that follow the current GUI style.

    \sa qDrawWinPanel(), QStyle
*/

void qDrawWinButton(QPainter *p, int x, int y, int w, int h,
                     const QPalette &pal, bool sunken,
                     const QBrush *fill)
{
    if (sunken)
        qDrawWinShades(p, x, y, w, h,
                       pal.shadow().color(), pal.light().color(), pal.dark().color(),
                       pal.button().color(), fill);
    else
        qDrawWinShades(p, x, y, w, h,
                       pal.light().color(), pal.shadow().color(), pal.button().color(),
                       pal.dark().color(), fill);
}

/*!
    \fn void qDrawWinPanel(QPainter *painter, int x, int y, int width, int height,
                    const QPalette &palette, bool        sunken,
                    const QBrush *fill)
    \relates QPainter

    Draws the Windows-style panel specified by the given point(\a x,
    \a y), \a width and \a height using the provided \a painter with a
    line width of 2 pixels. The button's interior is filled with the
    \a fill brush unless \a fill is 0.

    The given \a palette specifies the shading colors.  The panel
    appears sunken if \a sunken is true, otherwise raised.

    \warning This function does not look at QWidget::style() or
    QApplication::style(). Use the drawing functions in QStyle to make
    widgets that follow the current GUI style.

    Alternatively you can use a QFrame widget and apply the
    QFrame::setFrameStyle() function to display a shaded panel:

    \code
        QFrame frame:
        frame.setFrameStyle(QFrame::WinPanel | QFrame::Raised);
    \endcode

    \sa qDrawShadePanel(), qDrawWinButton(), QStyle
*/

void qDrawWinPanel(QPainter *p, int x, int y, int w, int h,
                    const QPalette &pal, bool        sunken,
                    const QBrush *fill)
{
    if (sunken)
        qDrawWinShades(p, x, y, w, h,
                        pal.dark().color(), pal.light().color(), pal.shadow().color(),
                       pal.midlight().color(), fill);
    else
        qDrawWinShades(p, x, y, w, h,
                       pal.light().color(), pal.shadow().color(), pal.midlight().color(),
                       pal.dark().color(), fill);
}

/*!
    \fn void qDrawPlainRect(QPainter *painter, int x, int y, int width, int height, const QColor &lineColor,
                     int lineWidth, const QBrush *fill)
    \relates QPainter

    Draws the plain rectangle beginning at (\a x, \a y) with the given
    \a width and \a height, using the specified \a painter, \a lineColor
    and \a lineWidth. The rectangle's interior is filled with the \a
    fill brush unless \a fill is 0.

    \warning This function does not look at QWidget::style() or
    QApplication::style(). Use the drawing functions in QStyle to make
    widgets that follow the current GUI style.

    Alternatively you can use a QFrame widget and apply the
    QFrame::setFrameStyle() function to display a plain rectangle:

    \code
        QFrame frame:
        frame.setFrameStyle(QFrame::Box | QFrame::Plain);
    \endcode

    \sa qDrawShadeRect(), QStyle
*/

void qDrawPlainRect(QPainter *p, int x, int y, int w, int h, const QColor &c,
                     int lineWidth, const QBrush *fill)
{
    if (w == 0 || h == 0)
        return;
    if (!(w > 0 && h > 0 && lineWidth >= 0)) {
        qWarning("qDrawPlainRect: Invalid parameters");
    }
    QPen   oldPen   = p->pen();
    QBrush oldBrush = p->brush();
    p->setPen(c);
    p->setBrush(Qt::NoBrush);
    for (int i=0; i<lineWidth; i++)
        p->drawRect(x+i, y+i, w-i*2 - 1, h-i*2 - 1);
    if (fill) {                                // fill with fill color
        p->setPen(Qt::NoPen);
        p->setBrush(*fill);
        p->drawRect(x+lineWidth, y+lineWidth, w-lineWidth*2, h-lineWidth*2);
    }
    p->setPen(oldPen);
    p->setBrush(oldBrush);
}

/*****************************************************************************
  Overloaded functions.
 *****************************************************************************/

/*!
    \fn void qDrawShadeLine(QPainter *painter, const QPoint &p1, const QPoint &p2,
             const QPalette &palette, bool sunken, int lineWidth, int midLineWidth)
    \relates QPainter
    \overload

    Draws a horizontal or vertical shaded line between \a p1 and \a p2
    using the given \a painter.  Note that nothing is drawn if the line
    between the points would be neither horizontal nor vertical.

    The provided \a palette specifies the shading colors (\l
    {QPalette::light()}{light}, \l {QPalette::dark()}{dark} and \l
    {QPalette::mid()}{middle} colors).  The given \a lineWidth
    specifies the line width for each of the lines; it is not the
    total line width. The given \a midLineWidth specifies the width of
    a middle line drawn in the QPalette::mid() color.

    The line appears sunken if \a sunken is true, otherwise raised.

    \warning This function does not look at QWidget::style() or
    QApplication::style().  Use the drawing functions in QStyle to
    make widgets that follow the current GUI style.


    Alternatively you can use a QFrame widget and apply the
    QFrame::setFrameStyle() function to display a shaded line:

    \code
        QFrame frame:
        frame.setFrameStyle(QFrame::HLine | QFrame::Sunken);
    \endcode

    \sa qDrawShadeRect(), qDrawShadePanel(), QStyle
*/

void qDrawShadeLine(QPainter *p, const QPoint &p1, const QPoint &p2,
                     const QPalette &pal, bool sunken,
                     int lineWidth, int midLineWidth)
{
    qDrawShadeLine(p, p1.x(), p1.y(), p2.x(), p2.y(), pal, sunken,
                    lineWidth, midLineWidth);
}

/*!
    \fn void qDrawShadeRect(QPainter *painter, const QRect &rect, const QPalette &palette,
             bool sunken, int lineWidth, int midLineWidth, const QBrush *fill)
    \relates QPainter
    \overload

    Draws the shaded rectangle specified by \a rect using the given \a painter.

    The provide \a palette specifies the shading colors (\l
    {QPalette::light()}{light}, \l {QPalette::dark()}{dark} and \l
    {QPalette::mid()}{middle} colors.  The given \a lineWidth
    specifies the line width for each of the lines; it is not the
    total line width.  The \a midLineWidth specifies the width of a
    middle line drawn in the QPalette::mid() color.  The rectangle's
    interior is filled with the \a fill brush unless \a fill is 0.

    The rectangle appears sunken if \a sunken is true, otherwise
    raised.

    \warning This function does not look at QWidget::style() or
    QApplication::style(). Use the drawing functions in QStyle to make
    widgets that follow the current GUI style.

    Alternatively you can use a QFrame widget and apply the
    QFrame::setFrameStyle() function to display a shaded rectangle:

    \code
        QFrame frame:
        frame.setFrameStyle(QFrame::Box | QFrame::Raised);
    \endcode

    \sa qDrawShadeLine(), qDrawShadePanel(), qDrawPlainRect(), QStyle
*/

void qDrawShadeRect(QPainter *p, const QRect &r,
                     const QPalette &pal, bool sunken,
                     int lineWidth, int midLineWidth,
                     const QBrush *fill)
{
    qDrawShadeRect(p, r.x(), r.y(), r.width(), r.height(), pal, sunken,
                    lineWidth, midLineWidth, fill);
}

/*!
    \fn void qDrawShadePanel(QPainter *painter, const QRect &rect, const QPalette &palette,
             bool sunken, int lineWidth, const QBrush *fill)
    \relates QPainter
    \overload

    Draws the shaded panel at the rectangle specified by \a rect using the
    given \a painter and the given \a lineWidth.

    The given \a palette specifies the shading colors (\l
    {QPalette::light()}{light}, \l {QPalette::dark()}{dark} and \l
    {QPalette::mid()}{middle} colors).  The panel's interior is filled
    with the \a fill brush unless \a fill is 0.

    The panel appears sunken if \a sunken is true, otherwise raised.

    \warning This function does not look at QWidget::style() or
    QApplication::style(). Use the drawing functions in QStyle to make
    widgets that follow the current GUI style.

    Alternatively you can use a QFrame widget and apply the
    QFrame::setFrameStyle() function to display a shaded panel:

    \code
        QFrame frame:
        frame.setFrameStyle( QFrame::Panel | QFrame::Sunken);
    \endcode

    \sa qDrawWinPanel(), qDrawShadeLine(), qDrawShadeRect(), QStyle
*/

void qDrawShadePanel(QPainter *p, const QRect &r,
                      const QPalette &pal, bool sunken,
                      int lineWidth, const QBrush *fill)
{
    qDrawShadePanel(p, r.x(), r.y(), r.width(), r.height(), pal, sunken,
                     lineWidth, fill);
}

/*!
    \fn void qDrawWinButton(QPainter *painter, const QRect &rect, const QPalette &palette,
             bool sunken, const QBrush *fill)
    \relates QPainter
    \overload

    Draws the Windows-style button at the rectangle specified by \a rect using
    the given \a painter with a line width of 2 pixels. The button's interior
    is filled with the \a{fill} brush unless \a fill is 0.

    The given \a palette specifies the shading colors (\l
    {QPalette::light()}{light}, \l {QPalette::dark()}{dark} and \l
    {QPalette::mid()}{middle} colors).

    The button appears sunken if \a sunken is true, otherwise raised.

    \warning This function does not look at QWidget::style() or
    QApplication::style()-> Use the drawing functions in QStyle to make
    widgets that follow the current GUI style.

    \sa qDrawWinPanel(), QStyle
*/

void qDrawWinButton(QPainter *p, const QRect &r,
                     const QPalette &pal, bool sunken, const QBrush *fill)
{
    qDrawWinButton(p, r.x(), r.y(), r.width(), r.height(), pal, sunken, fill);
}

/*!
    \fn void qDrawWinPanel(QPainter *painter, const QRect &rect, const QPalette &palette,
             bool sunken, const QBrush *fill)
    \overload

    Draws the Windows-style panel at the rectangle specified by \a rect using
    the given \a painter with a line width of 2 pixels. The button's interior
    is filled with the \a fill brush unless \a fill is 0.

    The given \a palette specifies the shading colors.  The panel
    appears sunken if \a sunken is true, otherwise raised.

    \warning This function does not look at QWidget::style() or
    QApplication::style(). Use the drawing functions in QStyle to make
    widgets that follow the current GUI style.

    Alternatively you can use a QFrame widget and apply the