QCursor Class

Qt 3.0.5

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QCursor Class Reference

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

#include <qcursor.h>

Inherits Qt.

List of all member functions.

Public Members

  • QCursor ()
  • QCursor ( int shape )
  • QCursor ( const QBitmap & bitmap, const QBitmap & mask, int hotX = -1, int hotY = -1 )
  • QCursor ( const QPixmap & pixmap, int hotX = -1, int hotY = -1 )
  • QCursor ( const QCursor & c )
  • ~QCursor ()
  • QCursor & operator= ( const QCursor & c )
  • int shape () const
  • void setShape ( int shape )
  • const QBitmap * bitmap () const
  • const QBitmap * mask () const
  • QPoint hotSpot () const
  • HCURSOR handle () const
  • QCursor ( HCURSOR handle )
  • HANDLE handle () const

Static Public Members

Related Functions

  • QDataStream & operator<< ( QDataStream & s, const QCursor & c )
  • QDataStream & operator>> ( QDataStream & s, QCursor & c )

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().

Cursor Shapes

See also QWidget, GUI Design Handbook: Cursors, Widget Appearance and Style and Implicitly and Explicitly Shared Classes.

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 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 and fileiconview/qfileiconview.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

QDataStream & operator<< ( QDataStream & s, const QCursor & c )

Writes the cursor c to the stream s.

See also Format of the QDataStream operators.

QDataStream & operator>> ( QDataStream & s, QCursor & c )

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. Copyright © 1995-2002 Trolltech. All Rights Reserved.

Copyright © 2002 TrolltechTrademarks
Qt version 3.0.5

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