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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtGui 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 either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** 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 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://qt.nokia.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qcursor.h"
#ifndef QT_NO_CURSOR
#include <qapplication.h>
#include <qbitmap.h>
#include <qimage.h>
#include <qdatastream.h>
#include <qvariant.h>
#include <private/qcursor_p.h>
QT_BEGIN_NAMESPACE
/*!
\class QCursor
\brief The QCursor class provides a mouse cursor with an arbitrary
shape.
\ingroup appearance
\ingroup shared
\mainclass
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 Qt::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().
\bold{Note:} It is possible to create a QCursor before
QApplication, but it is not useful except as a place-holder for a
real QCursor created after QApplication. Attempting to use a
QCursor that was created before QApplication will result in a
crash.
\section1 A Note for X11 Users
On X11, Qt supports the \link
http://www.xfree86.org/4.3.0/Xcursor.3.html Xcursor\endlink
library, which allows for full color icon themes. The table below
shows the cursor name used for each Qt::CursorShape value. If a
cursor cannot be found using the name shown below, a standard X11
cursor will be used instead. Note: X11 does not provide
appropriate cursors for all possible Qt::CursorShape values. It
is possible that some cursors will be taken from the Xcursor
theme, while others will use an internal bitmap cursor.
\table
\header \o Shape \o Qt::CursorShape Value \o Cursor Name
\o Shape \o Qt::CursorShape Value \o Cursor Name
\row \o \inlineimage cursor-arrow.png
\o Qt::ArrowCursor \o \c left_ptr
\o \inlineimage cursor-sizev.png
\o Qt::SizeVerCursor \o \c size_ver
\row \o \inlineimage cursor-uparrow.png
\o Qt::UpArrowCursor \o \c up_arrow
\o \inlineimage cursor-sizeh.png
\o Qt::SizeHorCursor \o \c size_hor
\row \o \inlineimage cursor-cross.png
\o Qt::CrossCursor \o \c cross
\o \inlineimage cursor-sizeb.png
\o Qt::SizeBDiagCursor \o \c size_bdiag
\row \o \inlineimage cursor-ibeam.png
\o Qt::IBeamCursor \o \c ibeam
\o \inlineimage cursor-sizef.png
\o Qt::SizeFDiagCursor \o \c size_fdiag
\row \o \inlineimage cursor-wait.png
\o Qt::WaitCursor \o \c wait
\o \inlineimage cursor-sizeall.png
\o Qt::SizeAllCursor \o \c size_all
\row \o \inlineimage cursor-busy.png
\o Qt::BusyCursor \o \c left_ptr_watch
\o \inlineimage cursor-vsplit.png
\o Qt::SplitVCursor \o \c split_v
\row \o \inlineimage cursor-forbidden.png
\o Qt::ForbiddenCursor \o \c forbidden
\o \inlineimage cursor-hsplit.png
\o Qt::SplitHCursor \o \c split_h
\row \o \inlineimage cursor-hand.png
\o Qt::PointingHandCursor \o \c pointing_hand
\o \inlineimage cursor-openhand.png
\o Qt::OpenHandCursor \o \c openhand
\row \o \inlineimage cursor-whatsthis.png
\o Qt::WhatsThisCursor \o \c whats_this
\o \inlineimage cursor-closedhand.png
\o Qt::ClosedHandCursor \o \c closedhand
\endtable
\sa QWidget, {fowler}{GUI Design Handbook: Cursors}
*/
/*!
\fn HCURSOR_or_HANDLE QCursor::handle() const
Returns a platform-specific cursor handle. The \c
HCURSOR_or_HANDLE type is \c HCURSOR on Windows and Qt::HANDLE on X11
and Mac OS X. On \l{Qt for Embedded Linux} it is an integer.
\warning Using the value returned by this function is not
portable.
*/
/*!
\fn QCursor::QCursor(HCURSOR cursor)
Constructs a Qt cursor from the given Windows \a cursor.
\warning This function is only available on Windows.
\sa handle()
*/
/*!
\fn QCursor::QCursor(Qt::HANDLE handle)
Constructs a Qt cursor from the given \a handle.
\warning This function is only available on X11.
\sa handle()
*/
/*!
\fn QPoint QCursor::pos()
Returns the position of the cursor (hot spot) in global screen
coordinates.
You can call QWidget::mapFromGlobal() to translate it to widget
coordinates.
\sa setPos(), QWidget::mapFromGlobal(), QWidget::mapToGlobal()
*/
/*!
\fn void QCursor::setPos(int x, int y)
Moves the cursor (hot spot) to the global screen position (\a x,
\a y).
You can call QWidget::mapToGlobal() to translate widget
coordinates to global screen coordinates.
\sa pos(), QWidget::mapFromGlobal(), QWidget::mapToGlobal()
*/
/*!
\fn void QCursor::setPos (const QPoint &p)
\overload
Moves the cursor (hot spot) to the global screen position at point
\a p.
*/
/*****************************************************************************
QCursor stream functions
*****************************************************************************/
#ifndef QT_NO_DATASTREAM
/*!
\fn QDataStream &operator<<(QDataStream &stream, const QCursor &cursor)
\relates QCursor
Writes the \a cursor to the \a stream.
\sa {Format of the QDataStream operators}
*/
QDataStream &operator<<(QDataStream &s, const QCursor &c)
{
s << (qint16)c.shape(); // write shape id to stream
if (c.shape() == Qt::BitmapCursor) { // bitmap cursor
bool isPixmap = false;
if (s.version() >= 7) {
isPixmap = !c.pixmap().isNull();
s << isPixmap;
}
if (isPixmap)
s << c.pixmap();
else
s << *c.bitmap() << *c.mask();
s << c.hotSpot();
}
return s;
}
/*!
\fn QDataStream &operator>>(QDataStream &stream, QCursor &cursor)
\relates QCursor
Reads the \a cursor from the \a stream.
\sa {Format of the QDataStream operators}
*/
QDataStream &operator>>(QDataStream &s, QCursor &c)
{
qint16 shape;
s >> shape; // read shape id from stream
if (shape == Qt::BitmapCursor) { // read bitmap cursor
bool isPixmap = false;
if (s.version() >= 7)
s >> isPixmap;
if (isPixmap) {
QPixmap pm;
QPoint hot;
s >> pm >> hot;
c = QCursor(pm, hot.x(), hot.y());
} else {
QBitmap bm, bmm;
QPoint hot;
s >> bm >> bmm >> hot;
c = QCursor(bm, bmm, hot.x(), hot.y());
}
} else {
c.setShape((Qt::CursorShape)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 32 x 32 cursors,
because this size is supported on all platforms. Some platforms
also support 16 x 16, 48 x 48, and 64 x 64 cursors.
\note On Windows CE, the cursor size is fixed. If the pixmap
is bigger than the system size, it will be scaled.
\sa QPixmap::QPixmap(), QPixmap::setMask()
*/
QCursor::QCursor(const QPixmap &pixmap, int hotX, int hotY)
: d(0)
{
QImage img = pixmap.toImage().convertToFormat(QImage::Format_Indexed8, Qt::ThresholdDither|Qt::AvoidDither);
QBitmap bm = QBitmap::fromImage(img, Qt::ThresholdDither|Qt::AvoidDither);
QBitmap bmm = pixmap.mask();
if (!bmm.isNull()) {
QBitmap nullBm;
bm.setMask(nullBm);
}
else if (!pixmap.mask().isNull()) {
QImage mimg = pixmap.mask().toImage().convertToFormat(QImage::Format_Indexed8, Qt::ThresholdDither|Qt::AvoidDither);
bmm = QBitmap::fromImage(mimg, Qt::ThresholdDither|Qt::AvoidDither);
}
else {
bmm = QBitmap(bm.size());
bmm.fill(Qt::color1);
}
d = QCursorData::setBitmap(bm, bmm, hotX, hotY);
d->pixmap = pixmap;
}
/*!
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
\o B=1 and M=1 gives black.
\o B=0 and M=1 gives white.
\o B=0 and M=0 gives transparent.
\o B=1 and M=0 gives an XOR'd result.
\endlist
Use the global Qt color Qt::color0 to draw 0-pixels and Qt::color1 to
draw 1-pixels in the bitmaps.
Valid cursor sizes depend on the display hardware (or the
underlying window system). We recommend using 32 x 32 cursors,
because this size is supported on all platforms. Some platforms
also support 16 x 16, 48 x 48, and 64 x 64 cursors.
\note On Windows CE, the cursor size is fixed. If the pixmap
is bigger than the system size, it will be scaled.
\sa QBitmap::QBitmap(), QBitmap::setMask()
*/
QCursor::QCursor(const QBitmap &bitmap, const QBitmap &mask, int hotX, int hotY)
: d(0)
{
d = QCursorData::setBitmap(bitmap, mask, hotX, hotY);
}
QCursorData *qt_cursorTable[Qt::LastCursor + 1];
bool QCursorData::initialized = false;
/*! \internal */
void QCursorData::cleanup()
{
if(!QCursorData::initialized)
return;
for (int shape = 0; shape <= Qt::LastCursor; ++shape) {
// In case someone has a static QCursor defined with this shape
if (!qt_cursorTable[shape]->ref.deref())
delete qt_cursorTable[shape];
qt_cursorTable[shape] = 0;
}
QCursorData::initialized = false;
}
/*! \internal */
void QCursorData::initialize()
{
if (QCursorData::initialized)
return;
#ifdef Q_WS_MAC
// DRSWAT - Not Needed Cocoa or Carbon
//InitCursor();
#endif
for (int shape = 0; shape <= Qt::LastCursor; ++shape)
qt_cursorTable[shape] = new QCursorData((Qt::CursorShape)shape);
QCursorData::initialized = true;
}
/*!
Constructs a cursor with the default arrow shape.
*/
QCursor::QCursor()
{
if (!QCursorData::initialized) {
if (QApplication::startingUp()) {
d = 0;
return;
}
QCursorData::initialize();
}
QCursorData *c = qt_cursorTable[0];
c->ref.ref();
d = c;
}
/*!
Constructs a cursor with the specified \a shape.
See \l Qt::CursorShape for a list of shapes.
\sa setShape()
*/
QCursor::QCursor(Qt::CursorShape shape)
: d(0)
{
if (!QCursorData::initialized)
QCursorData::initialize();
setShape(shape);
}
/*!
Returns the cursor shape identifier. The return value is one of
the \l Qt::CursorShape enum values (cast to an int).
\sa setShape()
*/
Qt::CursorShape QCursor::shape() const
{
if (!QCursorData::initialized)
QCursorData::initialize();
return d->cshape;
}
/*!
Sets the cursor to the shape identified by \a shape.
See \l Qt::CursorShape for the list of cursor shapes.
\sa shape()
*/
void QCursor::setShape(Qt::CursorShape shape)
{
if (!QCursorData::initialized)
QCursorData::initialize();
QCursorData *c = uint(shape) <= Qt::LastCursor ? qt_cursorTable[shape] : 0;
if (!c)
c = qt_cursorTable[0];
c->ref.ref();
if (!d) {
d = c;
} else {
if (!d->ref.deref())
delete d;
d = c;
}
}
/*!
Returns the cursor bitmap, or 0 if it is one of the standard
cursors.
*/
const QBitmap *QCursor::bitmap() const
{
if (!QCursorData::initialized)
QCursorData::initialize();
return d->bm;
}
/*!
Returns the cursor bitmap mask, or 0 if it is one of the standard
cursors.
*/
const QBitmap *QCursor::mask() const
{
if (!QCursorData::initialized)
QCursorData::initialize();
return d->bmm;
}
/*!
Returns the cursor pixmap. This is only valid if the cursor is a
pixmap cursor.
*/
QPixmap QCursor::pixmap() const
{
if (!QCursorData::initialized)
QCursorData::initialize();
return d->pixmap;
}
/*!
Returns the cursor hot spot, or (0, 0) if it is one of the
standard cursors.
*/
QPoint QCursor::hotSpot() const
{
if (!QCursorData::initialized)
QCursorData::initialize();
return QPoint(d->hx, d->hy);
}
/*!
Constructs a copy of the cursor \a c.
*/
QCursor::QCursor(const QCursor &c)
{
if (!QCursorData::initialized)
QCursorData::initialize();
d = c.d;
d->ref.ref();
}
/*!
Destroys the cursor.
*/
QCursor::~QCursor()
{
if (d && !d->ref.deref())
delete d;
}
/*!
Assigns \a c to this cursor and returns a reference to this
cursor.
*/
QCursor &QCursor::operator=(const QCursor &c)
{
if (!QCursorData::initialized)
QCursorData::initialize();
if (c.d)
c.d->ref.ref();
if (d && !d->ref.deref())
delete d;
d = c.d;
return *this;
}
/*!
Returns the cursor as a QVariant.
*/
QCursor::operator QVariant() const
{
return QVariant(QVariant::Cursor, this);
}
QT_END_NAMESPACE
#endif // QT_NO_CURSOR
|