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5369c7702909e6b6dd5c0790d2d68445ae9b0201
gtk3/gdk/gdkcursor.c

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/* GDK - The GIMP Drawing Kit
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GTK+ Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
*/
#include "config.h"
#define GDK_PIXBUF_ENABLE_BACKEND
#include <gdk-pixbuf/gdk-pixbuf.h>
#include "gdkcursor.h"
#include "gdkcursorprivate.h"
#include "gdkdisplayprivate.h"
#include "gdkintl.h"
#include "gdkinternals.h"
#include <math.h>
#include <errno.h>
/**
* SECTION:cursors
* @Short_description: Standard and pixmap cursors
* @Title: Cursors
*
* These functions are used to create and destroy cursors.
* There is a number of standard cursors, but it is also
* possible to construct new cursors from pixbufs. There
* may be limitations as to what kinds of cursors can be
* constructed on a given display, see
* gdk_display_supports_cursor_alpha(),
* gdk_display_supports_cursor_color(),
* gdk_display_get_default_cursor_size() and
* gdk_display_get_maximal_cursor_size().
*
* Cursors by themselves are not very interesting, they must be be
* bound to a window for users to see them. This is done with
* gdk_window_set_cursor() or by setting the cursor member of the
* #GdkWindowAttr passed to gdk_window_new().
*/
/**
* GdkCursor:
*
* A #GdkCursor represents a cursor. Its contents are private.
*/
enum {
PROP_0,
PROP_CURSOR_TYPE,
PROP_DISPLAY
};
G_DEFINE_ABSTRACT_TYPE (GdkCursor, gdk_cursor, G_TYPE_OBJECT)
static void
gdk_cursor_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GdkCursor *cursor = GDK_CURSOR (object);
switch (prop_id)
{
case PROP_CURSOR_TYPE:
g_value_set_enum (value, cursor->type);
break;
case PROP_DISPLAY:
g_value_set_object (value, cursor->display);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gdk_cursor_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GdkCursor *cursor = GDK_CURSOR (object);
switch (prop_id)
{
case PROP_CURSOR_TYPE:
cursor->type = g_value_get_enum (value);
break;
case PROP_DISPLAY:
cursor->display = g_value_get_object (value);
/* check that implementations actually provide the display when constructing */
g_assert (cursor->display != NULL);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gdk_cursor_class_init (GdkCursorClass *cursor_class)
{
GObjectClass *object_class = G_OBJECT_CLASS (cursor_class);
object_class->get_property = gdk_cursor_get_property;
object_class->set_property = gdk_cursor_set_property;
g_object_class_install_property (object_class,
PROP_CURSOR_TYPE,
g_param_spec_enum ("cursor-type",
P_("Cursor type"),
P_("Standard cursor type"),
GDK_TYPE_CURSOR_TYPE, GDK_X_CURSOR,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY));
g_object_class_install_property (object_class,
PROP_DISPLAY,
g_param_spec_object ("display",
P_("Display"),
P_("Display of this cursor"),
GDK_TYPE_DISPLAY,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY));
}
static void
gdk_cursor_init (GdkCursor *cursor)
{
}
/**
* gdk_cursor_ref:
* @cursor: a #GdkCursor
*
* Adds a reference to @cursor.
*
* Returns: (transfer full): Same @cursor that was passed in
*
* Deprecated: 3.0: Use g_object_ref() instead
*/
GdkCursor*
gdk_cursor_ref (GdkCursor *cursor)
{
g_return_val_if_fail (cursor != NULL, NULL);
return g_object_ref (cursor);
}
/**
* gdk_cursor_unref:
* @cursor: a #GdkCursor
*
* Removes a reference from @cursor, deallocating the cursor
* if no references remain.
*
* Deprecated: 3.0: Use g_object_unref() instead
*/
void
gdk_cursor_unref (GdkCursor *cursor)
{
g_return_if_fail (cursor != NULL);
g_object_unref (cursor);
}
/**
* gdk_cursor_new:
* @cursor_type: cursor to create
*
* Creates a new cursor from the set of builtin cursors for the default display.
* See gdk_cursor_new_for_display().
*
* To make the cursor invisible, use %GDK_BLANK_CURSOR.
*
* Returns: a new #GdkCursor
*/
GdkCursor*
gdk_cursor_new (GdkCursorType cursor_type)
{
return gdk_cursor_new_for_display (gdk_display_get_default(), cursor_type);
}
/**
* gdk_cursor_get_cursor_type:
* @cursor: a #GdkCursor
*
* Returns the cursor type for this cursor.
*
* Returns: a #GdkCursorType
*
* Since: 2.22
**/
GdkCursorType
gdk_cursor_get_cursor_type (GdkCursor *cursor)
{
g_return_val_if_fail (cursor != NULL, GDK_BLANK_CURSOR);
return cursor->type;
}
/**
* gdk_cursor_new_for_display:
* @display: the #GdkDisplay for which the cursor will be created
* @cursor_type: cursor to create
*
* Creates a new cursor from the set of builtin cursors.
* Some useful ones are:
* - ![](right_ptr.png) #GDK_RIGHT_PTR (right-facing arrow)
* - ![](crosshair.png) #GDK_CROSSHAIR (crosshair)
* - ![](xterm.png) #GDK_XTERM (I-beam)
* - ![](watch.png) #GDK_WATCH (busy)
* - ![](fleur.png) #GDK_FLEUR (for moving objects)
* - ![](hand1.png) #GDK_HAND1 (a right-pointing hand)
* - ![](hand2.png) #GDK_HAND2 (a left-pointing hand)
* - ![](left_side.png) #GDK_LEFT_SIDE (resize left side)
* - ![](right_side.png) #GDK_RIGHT_SIDE (resize right side)
* - ![](top_left_corner.png) #GDK_TOP_LEFT_CORNER (resize northwest corner)
* - ![](top_right_corner.png) #GDK_TOP_RIGHT_CORNER (resize northeast corner)
* - ![](bottom_left_corner.png) #GDK_BOTTOM_LEFT_CORNER (resize southwest corner)
* - ![](bottom_right_corner.png) #GDK_BOTTOM_RIGHT_CORNER (resize southeast corner)
* - ![](top_side.png) #GDK_TOP_SIDE (resize top side)
* - ![](bottom_side.png) #GDK_BOTTOM_SIDE (resize bottom side)
* - ![](sb_h_double_arrow.png) #GDK_SB_H_DOUBLE_ARROW (move vertical splitter)
* - ![](sb_v_double_arrow.png) #GDK_SB_V_DOUBLE_ARROW (move horizontal splitter)
* - #GDK_BLANK_CURSOR (Blank cursor). Since 2.16
*
* Returns: a new #GdkCursor
*
* Since: 2.2
**/
GdkCursor*
gdk_cursor_new_for_display (GdkDisplay *display,
GdkCursorType cursor_type)
{
g_return_val_if_fail (GDK_IS_DISPLAY (display), NULL);
return GDK_DISPLAY_GET_CLASS (display)->get_cursor_for_type (display, cursor_type);
}
/**
* gdk_cursor_new_from_name:
* @display: the #GdkDisplay for which the cursor will be created
* @name: the name of the cursor
*
* Creates a new cursor by looking up @name in the current cursor
* theme.
*
* Returns: (nullable): a new #GdkCursor, or %NULL if there is no
* cursor with the given name
*
* Since: 2.8
*/
GdkCursor*
gdk_cursor_new_from_name (GdkDisplay *display,
const gchar *name)
{
g_return_val_if_fail (GDK_IS_DISPLAY (display), NULL);
return GDK_DISPLAY_GET_CLASS (display)->get_cursor_for_name (display, name);
}
/**
* gdk_cursor_new_from_pixbuf:
* @display: the #GdkDisplay for which the cursor will be created
* @pixbuf: the #GdkPixbuf containing the cursor image
* @x: the horizontal offset of the “hotspot” of the cursor.
* @y: the vertical offset of the “hotspot” of the cursor.
*
* Creates a new cursor from a pixbuf.
*
* Not all GDK backends support RGBA cursors. If they are not
* supported, a monochrome approximation will be displayed.
* The functions gdk_display_supports_cursor_alpha() and
* gdk_display_supports_cursor_color() can be used to determine
* whether RGBA cursors are supported;
* gdk_display_get_default_cursor_size() and
* gdk_display_get_maximal_cursor_size() give information about
* cursor sizes.
*
* If @x or @y are `-1`, the pixbuf must have
* options named “x_hot” and “y_hot”, resp., containing
* integer values between `0` and the width resp. height of
* the pixbuf. (Since: 3.0)
*
* On the X backend, support for RGBA cursors requires a
* sufficently new version of the X Render extension.
*
* Returns: a new #GdkCursor.
*
* Since: 2.4
*/
GdkCursor *
gdk_cursor_new_from_pixbuf (GdkDisplay *display,
GdkPixbuf *pixbuf,
gint x,
gint y)
{
cairo_surface_t *surface;
const char *option;
char *end;
gint64 value;
GdkCursor *cursor;
g_return_val_if_fail (GDK_IS_DISPLAY (display), NULL);
g_return_val_if_fail (GDK_IS_PIXBUF (pixbuf), NULL);
if (x == -1 && (option = gdk_pixbuf_get_option (pixbuf, "x_hot")))
{
errno = 0;
end = NULL;
value = g_ascii_strtoll (option, &end, 10);
if (errno == 0 &&
end != option &&
value >= 0 && value < G_MAXINT)
x = (gint) value;
}
if (y == -1 && (option = gdk_pixbuf_get_option (pixbuf, "y_hot")))
{
errno = 0;
end = NULL;
value = g_ascii_strtoll (option, &end, 10);
if (errno == 0 &&
end != option &&
value >= 0 && value < G_MAXINT)
y = (gint) value;
}
surface = gdk_cairo_surface_create_from_pixbuf (pixbuf, 1, NULL);
cursor = GDK_DISPLAY_GET_CLASS (display)->get_cursor_for_surface (display, surface, x, y);
cairo_surface_destroy (surface);
return cursor;
}
/**
* gdk_cursor_new_from_surface:
* @display: the #GdkDisplay for which the cursor will be created
* @surface: the cairo image surface containing the cursor pixel data
* @x: the horizontal offset of the “hotspot” of the cursor
* @y: the vertical offset of the “hotspot” of the cursor
*
* Creates a new cursor from a cairo image surface.
*
* Not all GDK backends support RGBA cursors. If they are not
* supported, a monochrome approximation will be displayed.
* The functions gdk_display_supports_cursor_alpha() and
* gdk_display_supports_cursor_color() can be used to determine
* whether RGBA cursors are supported;
* gdk_display_get_default_cursor_size() and
* gdk_display_get_maximal_cursor_size() give information about
* cursor sizes.
*
* On the X backend, support for RGBA cursors requires a
* sufficently new version of the X Render extension.
*
* Returns: a new #GdkCursor.
*
* Since: 3.10
*/
GdkCursor *
gdk_cursor_new_from_surface (GdkDisplay *display,
cairo_surface_t *surface,
gdouble x,
gdouble y)
{
g_return_val_if_fail (GDK_IS_DISPLAY (display), NULL);
g_return_val_if_fail (surface != NULL, NULL);
g_return_val_if_fail (cairo_surface_get_type (surface) == CAIRO_SURFACE_TYPE_IMAGE, NULL);
g_return_val_if_fail (0 <= x && x < cairo_image_surface_get_width (surface), NULL);
g_return_val_if_fail (0 <= y && y < cairo_image_surface_get_height (surface), NULL);
return GDK_DISPLAY_GET_CLASS (display)->get_cursor_for_surface (display,
surface, x, y);
}
/**
* gdk_cursor_get_display:
* @cursor: a #GdkCursor.
*
* Returns the display on which the #GdkCursor is defined.
*
* Returns: (transfer none): the #GdkDisplay associated to @cursor
*
* Since: 2.2
*/
GdkDisplay *
gdk_cursor_get_display (GdkCursor *cursor)
{
g_return_val_if_fail (GDK_IS_CURSOR (cursor), NULL);
return cursor->display;
}
/**
* gdk_cursor_get_image:
* @cursor: a #GdkCursor
*
* Returns a #GdkPixbuf with the image used to display the cursor.
*
* Note that depending on the capabilities of the windowing system and
* on the cursor, GDK may not be able to obtain the image data. In this
* case, %NULL is returned.
*
* Returns: (nullable) (transfer full): a #GdkPixbuf representing
* @cursor, or %NULL
*
* Since: 2.8
*/
GdkPixbuf*
gdk_cursor_get_image (GdkCursor *cursor)
{
int w, h;
cairo_surface_t *surface;
GdkPixbuf *pixbuf;
gchar buf[32];
double x_hot, y_hot;
double x_scale, y_scale;
g_return_val_if_fail (GDK_IS_CURSOR (cursor), NULL);
surface = gdk_cursor_get_surface (cursor, &x_hot, &y_hot);
if (surface == NULL)
return NULL;
w = cairo_image_surface_get_width (surface);
h = cairo_image_surface_get_height (surface);
x_scale = y_scale = 1;
#ifdef HAVE_CAIRO_SURFACE_SET_DEVICE_SCALE
cairo_surface_get_device_scale (surface, &x_scale, &y_scale);
#endif
pixbuf = gdk_pixbuf_get_from_surface (surface, 0, 0, w, h);
cairo_surface_destroy (surface);
if (x_scale != 1)
{
GdkPixbuf *old;
old = pixbuf;
pixbuf = gdk_pixbuf_scale_simple (old,
w / x_scale, h / y_scale,
GDK_INTERP_HYPER);
g_object_unref (old);
}
g_snprintf (buf, 32, "%d", (int)x_hot);
gdk_pixbuf_set_option (pixbuf, "x_hot", buf);
g_snprintf (buf, 32, "%d", (int)y_hot);
gdk_pixbuf_set_option (pixbuf, "y_hot", buf);
return pixbuf;
}
/**
* gdk_cursor_get_surface:
* @cursor: a #GdkCursor
* @x_hot: (optional) (out): Location to store the hotspot x position,
* or %NULL
* @y_hot: (optional) (out): Location to store the hotspot y position,
* or %NULL
*
* Returns a cairo image surface with the image used to display the cursor.
*
* Note that depending on the capabilities of the windowing system and
* on the cursor, GDK may not be able to obtain the image data. In this
* case, %NULL is returned.
*
* Returns: (nullable) (transfer full): a #cairo_surface_t
* representing @cursor, or %NULL
*
* Since: 3.10
*/
cairo_surface_t *
gdk_cursor_get_surface (GdkCursor *cursor,
gdouble *x_hot,
gdouble *y_hot)
{
g_return_val_if_fail (GDK_IS_CURSOR (cursor), NULL);
return GDK_CURSOR_GET_CLASS (cursor)->get_surface (cursor, x_hot, y_hot);
}
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