Detailed Description
The QCursor class provides a mouse cursor with an arbitrary
shape.
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 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().
See also QWidget, GUI Design Handbook:
Cursors, Widget Appearance and Style, and Implicitly and Explicitly Shared Classes.
On X11, Qt supports the Xcursor
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.
| Qt::CursorShape Values | Cursor Names
|
| Qt::ArrowCursor | left_ptr
|
| Qt::UpArrowCursor | up_arrow
|
| Qt::CrossCursor | cross
|
| Qt::WaitCursor | wait
|
| Qt::BusyCursor | left_ptr_watch
|
| Qt::IbeamCursor | ibeam
|
| Qt::SizeVerCursor | size_ver
|
| Qt::SizeHorCursor | size_hor
|
| Qt::SizeBDiagCursor | size_bdiag
|
| Qt::SizeFDiagCursor | size_fdiag
|
| Qt::SizeAllCursor | size_all
|
| Qt::SplitVCursor | split_v
|
| Qt::SplitHCursor | split_h
|
| Qt::PointingHandCursor | pointing_hand
|
| Qt::ForbiddenCursor | forbidden
|
| Qt::WhatsThisCursor | whats_this
|
Member Function Documentation
QCursor::QCursor ()
Constructs a cursor with the default arrow shape.
QCursor::QCursor ( int shape )
Constructs a cursor with the specified shape.
See CursorShape for a list of shapes.
See also setShape().
QCursor::QCursor ( const QBitmap & bitmap, const QBitmap & mask, int hotX = -1, int hotY = -1 )
Constructs a custom bitmap cursor.
bitmap and
mask make up the bitmap.
hotX and
hotY define the cursor's hot spot.
If hotX is negative, it is set to the bitmap().width()/2.
If hotY is negative, it is set to the bitmap().height()/2.
The cursor bitmap (B) and mask (M) bits are combined like this:
- B=1 and M=1 gives black.
- B=0 and M=1 gives white.
- B=0 and M=0 gives transparent.
- B=1 and M=0 gives an undefined result.
Use the global Qt color color0 to draw 0-pixels and 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.
See also QBitmap::QBitmap() and QBitmap::setMask().
QCursor::QCursor ( const QPixmap & pixmap, int hotX = -1, int hotY = -1 )
Constructs a custom pixmap cursor.
pixmap is the image. It is usual to give it a mask (set using
QPixmap::setMask()). hotX and hotY define the cursor's hot
spot.
If hotX is negative, it is set to the pixmap().width()/2.
If hotY is negative, it is set to the 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.
See also QPixmap::QPixmap() and QPixmap::setMask().
QCursor::QCursor ( const QCursor & c )
Constructs a copy of the cursor c.
QCursor::QCursor ( HCURSOR handle )
Creates a cursor with the specified window system handle handle.
Warning:
Portable in principle, but if you use it you are probably about to
do something non-portable. Be careful.
QCursor::~QCursor ()
Destroys the cursor.
const QBitmap * QCursor::bitmap () const
Returns the cursor bitmap, or 0 if it is one of the standard
cursors.
void QCursor::cleanup () [static]
Internal function that deinitializes the predefined cursors.
This function is called from the QApplication destructor.
See also initialize().
HANDLE QCursor::handle () const
Returns the window system cursor handle.
Warning:
Portable in principle, but if you use it you are probably about to
do something non-portable. Be careful.
QPoint QCursor::hotSpot () const
Returns the cursor hot spot, or (0, 0) if it is one of the
standard cursors.
void QCursor::initialize () [static]
Internal function that initializes the predefined cursors.
This function is called from the QApplication constructor.
See also cleanup().
const QBitmap * QCursor::mask () const
Returns the cursor bitmap mask, or 0 if it is one of the standard
cursors.
QCursor & QCursor::operator= ( const QCursor & c )
Assigns c to this cursor and returns a reference to this
cursor.
QPoint QCursor::pos () [static]
Returns the position of the cursor (hot spot) in global screen
coordinates.
You can call QWidget::mapFromGlobal() to translate it to widget
coordinates.
See also setPos(), QWidget::mapFromGlobal(), and QWidget::mapToGlobal().
Examples: chart/canvasview.cpp, fileiconview/qfileiconview.cpp, and menu/menu.cpp.
void QCursor::setPos ( int x, int y ) [static]
Moves the cursor (hot spot) to the global screen position (x,
y).
You can call QWidget::mapToGlobal() to translate widget
coordinates to global screen coordinates.
See also pos(), QWidget::mapFromGlobal(), and QWidget::mapToGlobal().
void QCursor::setPos ( const QPoint & ) [static]
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
void QCursor::setShape ( int shape )
Sets the cursor to the shape identified by shape.
See CursorShape for the list of cursor shapes.
See also shape().
int QCursor::shape () const
Returns the cursor shape identifier. The return value is one of
the CursorShape enum values (cast to an int).
See also setShape().
Related Functions
Writes the cursor c to the stream s.
See also Format of the QDataStream operators.
Reads a cursor from the stream s and sets c to the read data.
See also Format of the QDataStream operators.
This file is part of the Qt toolkit.
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Trolltech. All Rights Reserved.
