A cursor is a small bitmap usually used for denoting where the mouse pointer is, with a picture that might indicate the interpretation of a mouse click. As with icons, cursors in X and MS Windows are created in a different manner. Therefore, separate cursors will be created for the different environments. Platform-specific methods for creating a wxCursor object are catered for, and this is an occasion where conditional compilation will probably be required (see wxIcon for an example).
A single cursor object may be used in many windows (any subwindow type). The wxWidgets convention is to set the cursor for a window, as in X, rather than to set it globally as in MS Windows, although a global ::wxSetCursor is also available for MS Windows use.
Derived from
Include files
<wx/cursor.h>
Predefined objects
Objects:
wxNullCursor
Pointers:
wxSTANDARD_CURSOR
wxHOURGLASS_CURSOR
wxCROSS_CURSOR
See also
wxBitmap, wxIcon, wxWindow::SetCursor, ::wxSetCursor
Members
wxCursor::wxCursor
wxCursor::~wxCursor
wxCursor::Ok
wxCursor::operator =
wxCursor::operator ==
wxCursor::operator !=
wxCursor()
Default constructor.
wxCursor(const char bits[], int width, int height, int hotSpotX=-1, int hotSpotY=-1, const char maskBits[]=NULL, wxColour* fg=NULL, wxColour* bg=NULL)
Constructs a cursor by passing an array of bits (Motif and GTK+ only). maskBits is used only under Motif and GTK+. The parameters fg and bg are only present on GTK+, and force the cursor to use particular background and foreground colours.
If either hotSpotX or hotSpotY is -1, the hotspot will be the centre of the cursor image (Motif only).
wxCursor(const wxString& cursorName, long type, int hotSpotX=0, int hotSpotY=0)
Constructs a cursor by passing a string resource name or filename.
On MacOS when specifying a string resource name, first the color cursors 'crsr' and then the black/white cursors 'CURS' in the resource chain are scanned through.
hotSpotX and hotSpotY are currently only used under Windows when loading from an icon file, to specify the cursor hotspot relative to the top left of the image.
wxCursor(int cursorId)
Constructs a cursor using a cursor identifier.
wxCursor(const wxImage& image)
Constructs a cursor from a wxImage. The cursor is monochrome, colors with the RGB elements all greater than 127 will be foreground, colors less than this background. The mask (if any) will be used as transparent.
In MSW the foreground will be white and the background black. If the cursor is larger than 32x32 it is resized. In GTK, the two most frequent colors will be used for foreground and background. The cursor will be displayed at the size of the image. On MacOS if the cursor is larger than 16x16 it is resized and currently only shown as black/white (mask respected).
wxCursor(const wxCursor& cursor)
Copy constructor. This uses reference counting so is a cheap operation.
Parameters
bits
maskBits
width
height
hotSpotX
hotSpotY
type
Under X, the permitted cursor types are:
| wxBITMAP_TYPE_XBM | Load an X bitmap file. |
Under Windows, the permitted types are:
| wxBITMAP_TYPE_CUR | Load a cursor from a .cur cursor file (only if USE_RESOURCE_LOADING_IN_MSW is enabled in setup.h). |
| wxBITMAP_TYPE_CUR_RESOURCE | Load a Windows resource (as specified in the .rc file). |
| wxBITMAP_TYPE_ICO | Load a cursor from a .ico icon file (only if USE_RESOURCE_LOADING_IN_MSW is enabled in setup.h). Specify hotSpotX and hotSpotY. |
cursorId
| wxCURSOR_ARROW | A standard arrow cursor. |
| wxCURSOR_RIGHT_ARROW | A standard arrow cursor pointing to the right. |
| wxCURSOR_BLANK | Transparent cursor. |
| wxCURSOR_BULLSEYE | Bullseye cursor. |
| wxCURSOR_CHAR | Rectangular character cursor. |
| wxCURSOR_CROSS | A cross cursor. |
| wxCURSOR_HAND | A hand cursor. |
| wxCURSOR_IBEAM | An I-beam cursor (vertical line). |
| wxCURSOR_LEFT_BUTTON | Represents a mouse with the left button depressed. |
| wxCURSOR_MAGNIFIER | A magnifier icon. |
| wxCURSOR_MIDDLE_BUTTON | Represents a mouse with the middle button depressed. |
| wxCURSOR_NO_ENTRY | A no-entry sign cursor. |
| wxCURSOR_PAINT_BRUSH | A paintbrush cursor. |
| wxCURSOR_PENCIL | A pencil cursor. |
| wxCURSOR_POINT_LEFT | A cursor that points left. |
| wxCURSOR_POINT_RIGHT | A cursor that points right. |
| wxCURSOR_QUESTION_ARROW | An arrow and question mark. |
| wxCURSOR_RIGHT_BUTTON | Represents a mouse with the right button depressed. |
| wxCURSOR_SIZENESW | A sizing cursor pointing NE-SW. |
| wxCURSOR_SIZENS | A sizing cursor pointing N-S. |
| wxCURSOR_SIZENWSE | A sizing cursor pointing NW-SE. |
| wxCURSOR_SIZEWE | A sizing cursor pointing W-E. |
| wxCURSOR_SIZING | A general sizing cursor. |
| wxCURSOR_SPRAYCAN | A spraycan cursor. |
| wxCURSOR_WAIT | A wait cursor. |
| wxCURSOR_WATCH | A watch cursor. |
| wxCURSOR_ARROWWAIT | A cursor with both an arrow and an hourglass, (windows.) |
Note that not all cursors are available on all platforms.
cursor
wxPython note: Constructors supported by wxPython are:
| wxCursor(name, flags, hotSpotX=0, hotSpotY=0) | Constructs a cursor from a filename |
| wxStockCursor(id) | Constructs a stock cursor |
wxPerl note: Constructors supported by wxPerl are:
Example
The following is an example of creating a cursor from 32x32 bitmap data (down_bits) and a mask (down_mask) where 1 is black and 0 is white for the bits, and 1 is opaque and 0 is transparent for the mask. It works on Windows and GTK+.
static char down_bits[] = { 255, 255, 255, 255, 31,
255, 255, 255, 31, 255, 255, 255, 31, 255, 255, 255,
31, 255, 255, 255, 31, 255, 255, 255, 31, 255, 255,
255, 31, 255, 255, 255, 31, 255, 255, 255, 25, 243,
255, 255, 19, 249, 255, 255, 7, 252, 255, 255, 15, 254,
255, 255, 31, 255, 255, 255, 191, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255 };
static char down_mask[] = { 240, 1, 0, 0, 240, 1,
0, 0, 240, 1, 0, 0, 240, 1, 0, 0, 240, 1, 0, 0, 240, 1,
0, 0, 240, 1, 0, 0, 240, 1, 0, 0, 255, 31, 0, 0, 255,
31, 0, 0, 254, 15, 0, 0, 252, 7, 0, 0, 248, 3, 0, 0,
240, 1, 0, 0, 224, 0, 0, 0, 64, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0 };
#ifdef __WXMSW__
wxBitmap down_bitmap(down_bits, 32, 32);
wxBitmap down_mask_bitmap(down_mask, 32, 32);
down_bitmap.SetMask(new wxMask(down_mask_bitmap));
wxImage down_image = down_bitmap.ConvertToImage();
down_image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_X, 6);
down_image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y, 14);
wxCursor down_cursor = wxCursor(down_image);
#else
wxCursor down_cursor = wxCursor(down_bits, 32, 32,
6, 14, down_mask, wxWHITE, wxBLACK);
#endif
~wxCursor()
Destroys the cursor. A cursor can be reused for more than one window, and does not get destroyed when the window is destroyed. wxWidgets destroys all cursors on application exit, although it is best to clean them up explicitly.
bool Ok() const
Returns true if cursor data is present.
wxCursor& operator =(const wxCursor& cursor)
Assignment operator, using reference counting. Returns a reference to 'this'.
bool operator ==(const wxCursor& cursor)
Equality operator. Two cursors are equal if they contain pointers to the same underlying cursor data. It does not compare each attribute, so two independently-created cursors using the same parameters will fail the test.
bool operator !=(const wxCursor& cursor)
Inequality operator. Two cursors are not equal if they contain pointers to different underlying cursor data. It does not compare each attribute.