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

#ifndef QT_NO_QCOLUMNVIEW

#include "qcolumnviewgrip_p.h"

#include <qstyleoption.h>

#include <qpainter.h>

#include <qbrush.h>

#include <qevent.h>

#include <qdebug.h>

QT_BEGIN_NAMESPACE

/*

    \internal

    class QColumnViewGrip

    QColumnViewGrip is created to go inside QAbstractScrollArea's corner.

    When the mouse it moved it will resize the scroll area and emit's a signal.

 */

/*

    \internal

    \fn void QColumnViewGrip::gripMoved()

    Signal that is emitted when the grip moves the parent widget.

 */

/*!

    Creates a new QColumnViewGrip with the given \a parent to view a model.

    Use setModel() to set the model.

*/

QColumnViewGrip::QColumnViewGrip(QWidget *parent)

:  QWidget(*new QColumnViewGripPrivate, parent, 0)

{

#ifndef QT_NO_CURSOR

    setCursor(Qt::SplitHCursor);

#endif

}

/*!

  \internal

*/

QColumnViewGrip::QColumnViewGrip(QColumnViewGripPrivate & dd, QWidget *parent, Qt::WFlags f)

:  QWidget(dd, parent, f)

{

}

/*!

  Destroys the view.

*/

QColumnViewGrip::~QColumnViewGrip()

{

}

/*!

    Attempt to resize the parent object by \a offset

    returns the amount of offset that it was actually able to resized

*/

int QColumnViewGrip::moveGrip(int offset)

{

    QWidget *parentWidget = (QWidget*)parent();

    // first resize the parent

    int oldWidth = parentWidget->width();

    int newWidth = oldWidth;

    if (isRightToLeft())

       newWidth -= offset;

    else

       newWidth += offset;

    newWidth = qMax(parentWidget->minimumWidth(), newWidth);

    parentWidget->resize(newWidth, parentWidget->height());

    // Then have the view move the widget

    int realOffset = parentWidget->width() - oldWidth;

    int oldX = parentWidget->x();

    if (realOffset != 0)

        emit gripMoved(realOffset);

    if (isRightToLeft())

        realOffset = -1 * (oldX - parentWidget->x());

    return realOffset;

}

/*!

    \reimp

*/

void QColumnViewGrip::paintEvent(QPaintEvent *event)

{

    QPainter painter(this);

    QStyleOption opt;

    opt.initFrom(this);

    style()->drawControl(QStyle::CE_ColumnViewGrip, &opt, &painter, this);

    event->accept();

}

/*!

    \reimp

    Resize the parent window to the sizeHint

*/

void QColumnViewGrip::mouseDoubleClickEvent(QMouseEvent *event)

{

    Q_UNUSED(event);

    QWidget *parentWidget = (QWidget*)parent();

    int offset = parentWidget->sizeHint().width() - parentWidget->width();

    if (isRightToLeft())

        offset *= -1;

    moveGrip(offset);

    event->accept();

}

/*!

    \reimp

    Begin watching for mouse movements

*/

void QColumnViewGrip::mousePressEvent(QMouseEvent *event)

{

    Q_D(QColumnViewGrip);

    d->originalXLocation = event->globalX();

    event->accept();

}

/*!

    \reimp

    Calculate the movement of the grip and moveGrip() and emit gripMoved

*/

void QColumnViewGrip::mouseMoveEvent(QMouseEvent *event)

{

    Q_D(QColumnViewGrip);

    int offset = event->globalX() - d->originalXLocation;

    d->originalXLocation = moveGrip(offset) + d->originalXLocation;

    event->accept();

}

/*!

    \reimp

    Stop watching for mouse movements

*/

void QColumnViewGrip::mouseReleaseEvent(QMouseEvent *event)

{

    Q_D(QColumnViewGrip);

    d->originalXLocation = -1;

    event->accept();

}

/*

 * private object implementation

 */

QColumnViewGripPrivate::QColumnViewGripPrivate()

:  QWidgetPrivate(),

originalXLocation(-1)

{

}

QT_END_NAMESPACE

#endif // QT_NO_QCOLUMNVIEW