/****************************************************************************

**

** All rights reserved.

** Contact: Nokia Corporation (qt-info@nokia.com)

**

** This file is part of the Qt3Support module of the Qt Toolkit.

**

** $QT_BEGIN_LICENSE:LGPL$

** No Commercial Usage

** This file contains pre-release code and may not be distributed.

** You may use this file in accordance with the terms and conditions

** contained in the Technology Preview License Agreement accompanying

** this package.

**

** GNU Lesser General Public License Usage

** Alternatively, this file may be used under the terms of the GNU Lesser

** General Public License version 2.1 as published by the Free Software

** Foundation and appearing in the file LICENSE.LGPL included in the

** packaging of this file.  Please review the following information to

** ensure the GNU Lesser General Public License version 2.1 requirements

** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.

**

** In addition, as a special exception, Nokia gives you certain additional

** rights.  These rights are described in the Nokia Qt LGPL Exception

** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.

**

** If you have questions regarding the use of this file, please contact

** Nokia at qt-info@nokia.com.

**

**

**

**

**

**

**

**

** $QT_END_LICENSE$

**

****************************************************************************/

#include "q3groupbox.h"

#include "qlayout.h"

#include "qpainter.h"

#include "qbitmap.h"

#include "q3accel.h"

#include "qradiobutton.h"

#include "qdrawutil.h"

#include "qapplication.h"

#include "qstyle.h"

#include "qcheckbox.h"

#include "qaccessible.h"

#include "qstyleoption.h"

#include "qdebug.h"

QT_BEGIN_NAMESPACE

/*!

    \class Q3GroupBox

    \brief The Q3GroupBox widget provides a group box frame with a title.

    \compat

    A group box provides a frame, a title and a keyboard shortcut, and

    displays various other widgets inside itself. The title is on top,

    the keyboard shortcut moves keyboard focus to one of the group

    box's child widgets, and the child widgets are usually laid out

    horizontally (or vertically) inside the frame.

    The simplest way to use it is to create a group box with the

    desired number of columns (or rows) and orientation, and then just

    create widgets with the group box as parent.

    It is also possible to change the orientation() and number of

    columns() after construction, or to ignore all the automatic

    layout support and manage the layout yourself. You can add 'empty'

    spaces to the group box with addSpace().

    Q3GroupBox also lets you set the title() (normally set in the

    constructor) and the title's alignment().

    You can change the spacing used by the group box with

    setInsideMargin() and setInsideSpacing(). To minimize space

    consumption, you can remove the right, left and bottom edges of

    the frame with setFlat().

    \sa QButtonGroup

*/

class QCheckBox;

class Q3GroupBoxPrivate

{

public:

    Q3GroupBoxPrivate(Q3GroupBox *w):

      q(w), vbox(0), grid(0), row(0), col(0), nRows(0), nCols(0), dir(Qt::Horizontal),

        spac(5), marg(11),

        checkbox(0),

        frameStyle(Q3GroupBox::GroupBoxPanel | Q3GroupBox::Sunken),

        lineWidth(1), midLineWidth(0), frameWidth(0),

        leftFrameWidth(0), rightFrameWidth(0),

        topFrameWidth(0), bottomFrameWidth(0) {}

    void updateFrameWidth();

    void updateStyledFrameWidths();

    Q3GroupBox *q;

    QVBoxLayout *vbox;

    QGridLayout *grid;

    int row;

    int col;

    int nRows, nCols;

    Qt::Orientation dir;

    int spac, marg;

    QCheckBox *checkbox;

    int frameStyle;

    int oldFrameStyle;

    short lineWidth, //line width

        midLineWidth; //midline width

    int frameWidth;

    short leftFrameWidth, rightFrameWidth, 

      topFrameWidth, bottomFrameWidth;

};

/*!

  \internal

  Updates the frame widths from the style.

*/

void Q3GroupBoxPrivate::updateStyledFrameWidths()

{

    QStyleOptionFrameV2 opt;

    opt.initFrom(q);

    QRect cr = q->style()->subElementRect(QStyle::SE_FrameContents, &opt, q);

    leftFrameWidth = cr.left() - opt.rect.left();

    topFrameWidth = cr.top() - opt.rect.top();

    rightFrameWidth = opt.rect.right() - cr.right(), 

    bottomFrameWidth = opt.rect.bottom() - cr.bottom();

    frameWidth = qMax(qMax(leftFrameWidth, rightFrameWidth), 

                      qMax(topFrameWidth, bottomFrameWidth));

}

/*!

  \internal

  Updated the frameWidth parameter.

*/

void Q3GroupBoxPrivate::updateFrameWidth()

{

    QRect fr = q->frameRect();

    int frameShape  = frameStyle & QFrame::Shape_Mask;

    int frameShadow = frameStyle & QFrame::Shadow_Mask;

    frameWidth = -1;

    switch (frameShape)  {

    case QFrame::NoFrame:

        frameWidth = 0;

        break;

    case QFrame::Box:

    case QFrame::HLine:

    case QFrame::VLine:

        switch (frameShadow) {

    case QFrame::Plain:

        frameWidth = lineWidth;

        break;

    case QFrame::Raised:

    case QFrame::Sunken:

        frameWidth = (short)(lineWidth*2 + midLineWidth);

        break;

        }

        break;

    case QFrame::StyledPanel:

        updateStyledFrameWidths();

        break;

    case QFrame::WinPanel:

        frameWidth = 2;

        break;

    case QFrame::Panel:

        switch (frameShadow) {

    case QFrame::Plain:

    case QFrame::Raised:

    case QFrame::Sunken:

        frameWidth = lineWidth;

        break;

        }

        break;

    }

    if (frameWidth == -1)                                // invalid style

        frameWidth = 0;

    q->setFrameRect(fr);

}

/*!

    Constructs a group box widget with no title.

    The \a parent and \a name arguments are passed to the QWidget

    constructor.

    This constructor does not do automatic layout.

*/

Q3GroupBox::Q3GroupBox(QWidget *parent, const char *name)

    : QGroupBox(parent, name)

{

    init();

}

/*!

    Constructs a group box with the title \a title.

    The \a parent and \a name arguments are passed to the QWidget

    constructor.

    This constructor does not do automatic layout.

*/

Q3GroupBox::Q3GroupBox(const QString &title, QWidget *parent, const char *name)

    : QGroupBox(parent, name)

{

    init();

    setTitle(title);

}

/*!

    Constructs a group box with no title. Child widgets will be

    arranged in \a strips rows or columns (depending on \a

    orientation).

    The \a parent and \a name arguments are passed to the QWidget

    constructor.

*/

Q3GroupBox::Q3GroupBox(int strips, Qt::Orientation orientation,

                    QWidget *parent, const char *name)

    : QGroupBox(parent, name)

{

    init();

    setColumnLayout(strips, orientation);

}

/*!

    Constructs a group box titled \a title. Child widgets will be

    arranged in \a strips rows or columns (depending on \a

    orientation).

    The \a parent and \a name arguments are passed to the QWidget

    constructor.

*/

Q3GroupBox::Q3GroupBox(int strips, Qt::Orientation orientation,

                    const QString &title, QWidget *parent,

                    const char *name)

    : QGroupBox(parent, name)

{

    init();

    setTitle(title);

    setColumnLayout(strips, orientation);

}

/*!

    Destroys the group box.

*/

Q3GroupBox::~Q3GroupBox()

{

    delete d;

}

void Q3GroupBox::init()

{

    d = new Q3GroupBoxPrivate(this);

}

/*! \reimp

*/

void Q3GroupBox::resizeEvent(QResizeEvent *e)

{

    QGroupBox::resizeEvent(e);

}

/*!

    Adds an empty cell at the next free position. If \a size is

    greater than 0, the empty cell takes \a size to be its fixed width

    (if orientation() is \c Horizontal) or height (if orientation() is

    \c Vertical).

    Use this method to separate the widgets in the group box or to

    skip the next free cell. For performance reasons, call this method

    after calling setColumnLayout() or by changing the \l

    Q3GroupBox::columns or \l Q3GroupBox::orientation properties. It is

    generally a good idea to call these methods first (if needed at

    all), and insert the widgets and spaces afterwards.

*/

void Q3GroupBox::addSpace(int size)

{

    QApplication::sendPostedEvents(this, QEvent::ChildInserted);

    if (d->nCols <= 0 || d->nRows <= 0)

        return;

    if (d->row >= d->nRows || d->col >= d->nCols)

        d->grid->expand(d->row+1, d->col+1);

    if (size > 0) {

        QSpacerItem *spacer

            = new QSpacerItem((d->dir == Qt::Horizontal) ? 0 : size,

                              (d->dir == Qt::Vertical) ? 0 : size,

                              QSizePolicy::Fixed, QSizePolicy::Fixed);

        d->grid->addItem(spacer, d->row, d->col);

    }

    skip();

}

/*!

    \property Q3GroupBox::columns

    \brief the number of columns or rows (depending on \l Q3GroupBox::orientation) in the group box

    Usually it is not a good idea to set this property because it is

    slow (it does a complete layout). It is best to set the number

    of columns directly in the constructor.

*/

int Q3GroupBox::columns() const

{

    if (d->dir == Qt::Horizontal)

        return d->nCols;

    return d->nRows;

}

void Q3GroupBox::setColumns(int c)

{

    setColumnLayout(c, d->dir);

}

/*!

    Returns the width of the empty space between the items in the

    group and the frame of the group.

    Only applies if the group box has a defined orientation.

    The default is usually 11, by may vary depending on the platform

    and style.

    \sa setInsideMargin(), orientation

*/

int Q3GroupBox::insideMargin() const

{

    return d->marg;

}

/*!

    Returns the width of the empty space between each of the items

    in the group.

    Only applies if the group box has a defined orientation.

    The default is usually 5, by may vary depending on the platform

    and style.

    \sa setInsideSpacing(), orientation

*/

int Q3GroupBox::insideSpacing() const

{

    return d->spac;

}

/*!

    Sets the width of the inside margin to \a m pixels.

    \sa insideMargin()

*/

void Q3GroupBox::setInsideMargin(int m)

{

    d->marg = m;

    setColumnLayout(columns(), d->dir);

}

/*!

    Sets the width of the empty space between each of the items in

    the group to \a s pixels.

    \sa insideSpacing()

*/

void Q3GroupBox::setInsideSpacing(int s)

{

    d->spac = s;

    setColumnLayout(columns(), d->dir);

}

/*!

    \property Q3GroupBox::orientation

    \brief the group box's orientation

    A horizontal group box arranges its children in columns, while a

    vertical group box arranges them in rows.

    Usually it is not a good idea to set this property because it is

    slow (it does a complete layout). It is better to set the

    orientation directly in the constructor.

*/

void Q3GroupBox::setOrientation(Qt::Orientation o)

{

    setColumnLayout(columns(), o);

}

Qt::Orientation Q3GroupBox::orientation() const

{

    return d->dir;

}

/*!

    Changes the layout of the group box. This function is only useful

    in combination with the default constructor that does not take any

    layout information. This function will put all existing children

    in the new layout. It is not good Qt programming style to call

    this function after children have been inserted. Sets the number

    of columns or rows to be \a strips, depending on \a direction.

    \sa orientation columns

*/

void Q3GroupBox::setColumnLayout(int strips, Qt::Orientation direction)

{

    if (layout())

        delete layout();

    d->vbox = 0;

    d->grid = 0;

    if (strips < 0) // if 0, we create the d->vbox but not the d->grid. See below.

        return;

    d->vbox = new QVBoxLayout(this, d->marg, 0);

    d->nCols = 0;

    d->nRows = 0;

    d->dir = direction;

    // Send all child events and ignore them. Otherwise we will end up

    // with doubled insertion. This won't do anything because d->nCols ==

    // d->nRows == 0.

    QApplication::sendPostedEvents(this, QEvent::ChildInserted);

    // if 0 or smaller , create a vbox-layout but no grid. This allows

    // the designer to handle its own grid layout in a group box.

    if (strips <= 0)

        return;

    d->dir = direction;

    if (d->dir == Qt::Horizontal) {

        d->nCols = strips;

        d->nRows = 1;

    } else {

        d->nCols = 1;

        d->nRows = strips;

    }

    d->grid = new QGridLayout(d->nRows, d->nCols, d->spac);

    d->row = d->col = 0;

    d->grid->setAlignment(Qt::AlignTop);

    d->vbox->addLayout(d->grid);

    // Add all children

    QObjectList childList = children();

    if (!childList.isEmpty()) {

        for (int i = 0; i < childList.size(); ++i) {

            QObject *o = childList.at(i);

            if (o->isWidgetType() && o != d->checkbox)

                insertWid(static_cast<QWidget *>(o));

        }

    }

}

/*!\reimp */

void Q3GroupBox::childEvent(QChildEvent *c)

{

    QGroupBox::childEvent(c);

    if (!c->inserted() || !c->child()->isWidgetType())

        return;

    if (d->grid) {

        insertWid((QWidget*)c->child());

    }

}

void Q3GroupBox::insertWid(QWidget* w)

{

    if (d->row >= d->nRows || d->col >= d->nCols)

        d->grid->expand(d->row+1, d->col+1);

    d->grid->addWidget(w, d->row, d->col);

    skip();

}

void Q3GroupBox::skip()

{

    // Same as QGrid::skip()

    if (d->dir == Qt::Horizontal) {

        if (d->col+1 < d->nCols) {

            d->col++;

        } else {

            d->col = 0;

            d->row++;

        }

    } else { //Vertical

        if (d->row+1 < d->nRows) {

            d->row++;

        } else {

            d->row = 0;

            d->col++;

        }

    }

}