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docs: Small additions for GdkCursor docs

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This commit is contained in:
Matthias Clasen 2020-10-29 13:41:10 -04:00
parent 9f71bdd045
commit 2df382277d
1 changed files with 32 additions and 22 deletions
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54
gdk/gdkcursor.c
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@ -43,13 +43,13 @@
*
* These functions are used to create and destroy cursors. Cursors
* are immutable objects, so once you created them, there is no way
* to modify them later. Create a new cursor, when you want to change
* to modify them later. Create a new cursor when you want to change
* something about it.
*
* Cursors by themselves are not very interesting, they must be
* bound to a window for users to see them. This is done with
* gdk_surface_set_cursor() or gdk_surface_set_device_cursor().
* Applications will typically use higher-level GTK+ functions such
* Applications will typically use higher-level GTK functions such
* as gtk_widget_set_cursor() instead.
*
* Cursors are not bound to a given #GdkDisplay, so they can be shared.
@ -59,16 +59,19 @@
* There are multiple ways to create cursors. The platform's own cursors
* can be created with gdk_cursor_new_from_name(). That function lists
* the commonly available names that are shared with the CSS specification.
* Other names may be available, depending on the platform in use.
* Other names may be available, depending on the platform in use. On some
* platforms, what images are used for named cursors may be influenced by
* the cursor theme.
*
* Another option to create a cursor is to use gdk_cursor_new_from_texture()
* and provide an image to use for the cursor.
*
* To ease work with unsupported cursors, a fallback cursor can be provided.
* If a #GdkSurface cannot use a cursor because of the reasons mentioned above,
* it will try the fallback cursor. Of course, fallback cursors can themselves
* have fallback cursors again, so it is possible to provide a chain of
* progressively easier to support cursors. If none of the provided cursors
* can be supported, the default cursor will be the ultimate fallback.
* it will try the fallback cursor. Fallback cursors can themselves have fallback
* cursors again, so it is possible to provide a chain of progressively easier
* to support cursors. If none of the provided cursors can be supported, the
* default cursor will be the ultimate fallback.
*/
/**
@ -175,40 +178,40 @@ gdk_cursor_class_init (GdkCursorClass *cursor_class)
object_class->finalize = gdk_cursor_finalize;
g_object_class_install_property (object_class,
PROP_FALLBACK,
g_param_spec_object ("fallback",
PROP_FALLBACK,
g_param_spec_object ("fallback",
P_("Fallback"),
P_("Cursor image to fall back to if this cursor cannot be displayed"),
GDK_TYPE_CURSOR,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS));
g_object_class_install_property (object_class,
PROP_HOTSPOT_X,
g_param_spec_int ("hotspot-x",
PROP_HOTSPOT_X,
g_param_spec_int ("hotspot-x",
P_("Hotspot X"),
P_("Horizontal offset of the cursor hotspot"),
0, G_MAXINT, 0,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS));
g_object_class_install_property (object_class,
PROP_HOTSPOT_Y,
g_param_spec_int ("hotspot-y",
PROP_HOTSPOT_Y,
g_param_spec_int ("hotspot-y",
P_("Hotspot Y"),
P_("Vertical offset of the cursor hotspot"),
0, G_MAXINT, 0,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS));
g_object_class_install_property (object_class,
PROP_NAME,
g_param_spec_string ("name",
PROP_NAME,
g_param_spec_string ("name",
P_("Name"),
P_("Name of this cursor"),
NULL,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS));
g_object_class_install_property (object_class,
PROP_TEXTURE,
g_param_spec_object ("texture",
PROP_TEXTURE,
g_param_spec_object ("texture",
P_("Texture"),
P_("The texture displayed by this cursor"),
GDK_TYPE_TEXTURE,
@ -345,8 +348,8 @@ gdk_cursor_new_from_name (const char *name,
*/
GdkCursor *
gdk_cursor_new_from_texture (GdkTexture *texture,
int hotspot_x,
int hotspot_y,
int hotspot_x,
int hotspot_y,
GdkCursor *fallback)
{
g_return_val_if_fail (GDK_IS_TEXTURE (texture), NULL);
@ -390,7 +393,7 @@ gdk_cursor_get_fallback (GdkCursor *cursor)
* @cursor: a #GdkCursor.
*
* Returns the name of the cursor. If the cursor is not a named cursor, %NULL
* will be returned and the GdkCursor::texture property will be set.
* will be returned.
*
* Returns: (transfer none) (nullable): the name of the cursor or %NULL if it is not
* a named cursor
@ -408,7 +411,7 @@ gdk_cursor_get_name (GdkCursor *cursor)
* @cursor: a #GdkCursor.
*
* Returns the texture for the cursor. If the cursor is a named cursor, %NULL
* will be returned and the GdkCursor::name property will be set.
* will be returned.
*
* Returns: (transfer none) (nullable): the texture for cursor or %NULL if it is a
* named cursor
@ -428,6 +431,10 @@ gdk_cursor_get_texture (GdkCursor *cursor)
* Returns the horizontal offset of the hotspot. The hotspot indicates the
* pixel that will be directly above the cursor.
*
* Note that named cursors may have a nonzero hotspot, but this function
* will only return the hotspot position for cursors created with
* gdk_cursor_new_from_texture().
*
* Returns: the horizontal offset of the hotspot or 0 for named cursors
*/
int
@ -445,6 +452,10 @@ gdk_cursor_get_hotspot_x (GdkCursor *cursor)
* Returns the vertical offset of the hotspot. The hotspot indicates the
* pixel that will be directly above the cursor.
*
* Note that named cursors may have a nonzero hotspot, but this function
* will only return the hotspot position for cursors created with
* gdk_cursor_new_from_texture().
*
* Returns: the vertical offset of the hotspot or 0 for named cursors
*/
int
@ -454,4 +465,3 @@ gdk_cursor_get_hotspot_y (GdkCursor *cursor)
return cursor->hotspot_y;
}