/****************************************************************************
** $Id: qt/qcursor.cpp   3.1.2   edited Nov 8 14:37 $
**
** Implementation of QCursor class
**
** Created : 940220
**
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**********************************************************************/

#include "qcursor.h"

#ifndef QT_NO_CURSOR

#include "qbitmap.h"
#include "qimage.h"
#include "qdatastream.h"


/*!
    \class QCursor qcursor.h

    \brief The QCursor class provides a mouse cursor with an arbitrary
    shape.

    \ingroup appearance
    \ingroup shared

    This class is mainly used to create mouse cursors that are
    associated with particular widgets and to get and set the position
    of the mouse cursor.

    Qt has a number of standard cursor shapes, but you can also make
    custom cursor shapes based on a QBitmap, a mask and a hotspot.

    To associate a cursor with a widget, use QWidget::setCursor(). To
    associate a cursor with all widgets (normally for a short period
    of time), use QApplication::setOverrideCursor().

    To set a cursor shape use QCursor::setShape() or use the QCursor
    constructor which takes the shape as argument, or you can use one
    of the predefined cursors defined in the \l CursorShape enum.

    If you want to create a cursor with your own bitmap, either use
    the QCursor constructor which takes a bitmap and a mask or the
    constructor which takes a pixmap as arguments.

    To set or get the position of the mouse cursor use the static
    methods QCursor::pos() and QCursor::setPos().

    \img cursors.png Cursor Shapes

    \sa QWidget \link guibooks.html#fowler GUI Design Handbook:
    Cursors\endlink
*/

/*!
    \enum Qt::CursorShape

    This enum type defines the various cursors that can be used.

    \value ArrowCursor - standard arrow cursor
    \value UpArrowCursor - upwards arrow
    \value CrossCursor - crosshair
    \value WaitCursor - hourglass/watch
    \value IbeamCursor - ibeam/text entry
    \value SizeVerCursor - vertical resize
    \value SizeHorCursor - horizontal resize
    \value SizeFDiagCursor - diagonal resize (\)
    \value SizeBDiagCursor - diagonal resize (/)
    \value SizeAllCursor - all directions resize
    \value BlankCursor - blank/invisible cursor
    \value SplitVCursor - vertical splitting
    \value SplitHCursor - horziontal splitting
    \value PointingHandCursor - a pointing hand
    \value ForbiddenCursor - a slashed circle
    \value WhatsThisCursor - an arrow with a question mark
    \value BitmapCursor

    ArrowCursor is the default for widgets in a normal state.

    \img cursors.png Cursor Shapes
*/

/*****************************************************************************
  QCursor stream functions
 *****************************************************************************/

#ifndef QT_NO_DATASTREAM


/*!
    \relates QCursor
    Writes the cursor \a c to the stream \a s.

    \sa \link datastreamformat.html Format of the QDataStream operators \endlink
*/

QDataStream &operator<<( QDataStream &s, const QCursor &c )
{
    s << (Q_INT16)c.shape();			// write shape id to stream
    if ( c.shape() == Qt::BitmapCursor ) {		// bitmap cursor
#if !defined(QT_NO_IMAGEIO)
	s << *c.bitmap() << *c.mask();
	s << c.hotSpot();
#else
	qWarning("No Image Cursor I/O");
#endif
    }
    return s;
}

/*!
    \relates QCursor
    Reads a cursor from the stream \a s and sets \a c to the read data.

    \sa \link datastreamformat.html Format of the QDataStream operators \endlink
*/

QDataStream &operator>>( QDataStream &s, QCursor &c )
{
    Q_INT16 shape;
    s >> shape;					// read shape id from stream
    if ( shape == Qt::BitmapCursor ) {		// read bitmap cursor
#if !defined(QT_NO_IMAGEIO)
	QBitmap bm, bmm;
	QPoint	hot;
	s >> bm >> bmm >> hot;
	c = QCursor( bm, bmm, hot.x(), hot.y() );
#else
	qWarning("No Image Cursor I/O");
#endif
    } else {
	c.setShape( (int)shape );		// create cursor with shape
    }
    return s;
}
#endif // QT_NO_DATASTREAM


/*!
    Constructs a custom pixmap cursor.

    \a pixmap is the image. It is usual to give it a mask (set using
    QPixmap::setMask()). \a hotX and \a hotY define the cursor's hot
    spot.

    If \a hotX is negative, it is set to the \c{pixmap().width()/2}.
    If \a hotY is negative, it is set to the \c{pixmap().height()/2}.

    Valid cursor sizes depend on the display hardware (or the
    underlying window system). We recommend using 32x32 cursors,
    because this size is supported on all platforms. Some platforms
    also support 16x16, 48x48 and 64x64 cursors.

    Currently, only black-and-white pixmaps can be used.

    \sa QPixmap::QPixmap(), QPixmap::setMask()
*/

QCursor::QCursor( const QPixmap &pixmap, int hotX, int hotY )
{
    QImage img = pixmap.convertToImage().
		    convertDepth( 8, Qt::ThresholdDither|Qt::AvoidDither );
    QBitmap bm;
    bm.convertFromImage( img, Qt::ThresholdDither|Qt::AvoidDither );
    QBitmap bmm;
    if ( bm.mask() ) {
	bmm = *bm.mask();
	QBitmap nullBm;
	bm.setMask( nullBm );
    }
    else if ( pixmap.mask() ) {
	QImage mimg = pixmap.mask()->convertToImage().
	              convertDepth( 8, Qt::ThresholdDither|Qt::AvoidDither );
	bmm.convertFromImage( mimg, Qt::ThresholdDither|Qt::AvoidDither );
    }
    else {
	bmm.resize( bm.size() );
	bmm.fill( Qt::color1 );
    }

    setBitmap(bm,bmm,hotX,hotY);
}



/*!
    Constructs a custom bitmap cursor.

    \a bitmap and
    \a mask make up the bitmap.
    \a hotX and
    \a hotY define the cursor's hot spot.

    If \a hotX is negative, it is set to the \c{bitmap().width()/2}.
    If \a hotY is negative, it is set to the \c{bitmap().height()/2}.

    The cursor \a bitmap (B) and \a mask (M) bits are combined like this:
    \list
    \i B=1 and M=1 gives black.
    \i B=0 and M=1 gives white.
    \i B=0 and M=0 gives transparent.
    \i B=1 and M=0 gives an undefined result.
    \endlist

    Use the global color \c color0 to draw 0-pixels and \c color1 to
    draw 1-pixels in the bitmaps.

    Valid cursor sizes depend on the display hardware (or the
    underlying window system). We recommend using 32x32 cursors,
    because this size is supported on all platforms. Some platforms
    also support 16x16, 48x48 and 64x64 cursors.

    \sa QBitmap::QBitmap(), QBitmap::setMask()
*/

QCursor::QCursor( const QBitmap &bitmap, const QBitmap &mask,
		  int hotX, int hotY )
{
    setBitmap(bitmap,mask,hotX,hotY);
}

#endif // QT_NO_CURSOR


