GtkImage

GtkImage — A widget displaying an image

Properties

gchar * file Read / Write
GIcon * gicon Read / Write
gchar * icon-name Read / Write
GtkIconSet * icon-set Read / Write
gint icon-size Read / Write
GdkPixbuf * pixbuf Read / Write
GdkPixbufAnimation * pixbuf-animation Read / Write
gint pixel-size Read / Write
gchar * resource Read / Write
gchar * stock Read / Write
GtkImageType storage-type Read
CairoSurface * surface Read / Write
gboolean use-fallback Read / Write

Types and Values

struct GtkImage
enum GtkImageType

Object Hierarchy

    GObject
    ╰── GInitiallyUnowned
        ╰── GtkWidget
            ╰── GtkMisc
                ╰── GtkImage

Implemented Interfaces

GtkImage implements AtkImplementorIface and GtkBuildable.

Includes

#include <gtk/gtk.h>

Description

The GtkImage widget displays an image. Various kinds of object can be displayed as an image; most typically, you would load a GdkPixbuf ("pixel buffer") from a file, and then display that. There’s a convenience function to do this, gtk_image_new_from_file(), used as follows:

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GtkWidget *image;
image = gtk_image_new_from_file ("myfile.png");

If the file isn’t loaded successfully, the image will contain a “broken image” icon similar to that used in many web browsers. If you want to handle errors in loading the file yourself, for example by displaying an error message, then load the image with gdk_pixbuf_new_from_file(), then create the GtkImage with gtk_image_new_from_pixbuf().

The image file may contain an animation, if so the GtkImage will display an animation (GdkPixbufAnimation) instead of a static image.

GtkImage is a subclass of GtkMisc, which implies that you can align it (center, left, right) and add padding to it, using GtkMisc methods.

GtkImage is a “no window” widget (has no GdkWindow of its own), so by default does not receive events. If you want to receive events on the image, such as button clicks, place the image inside a GtkEventBox, then connect to the event signals on the event box.

Handling button press events on a GtkImage.

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static gboolean
button_press_callback (GtkWidget      *event_box,
                       GdkEventButton *event,
                       gpointer        data)
{
  g_print ("Event box clicked at coordinates %f,%f\n",
           event->x, event->y);

  // Returning TRUE means we handled the event, so the signal
  // emission should be stopped (don’t call any further callbacks
  // that may be connected). Return FALSE to continue invoking callbacks.
  return TRUE;
}

static GtkWidget*
create_image (void)
{
  GtkWidget *image;
  GtkWidget *event_box;

  image = gtk_image_new_from_file ("myfile.png");

  event_box = gtk_event_box_new ();

  gtk_container_add (GTK_CONTAINER (event_box), image);

  g_signal_connect (G_OBJECT (event_box),
                    "button_press_event",
                    G_CALLBACK (button_press_callback),
                    image);

  return image;
}

When handling events on the event box, keep in mind that coordinates in the image may be different from event box coordinates due to the alignment and padding settings on the image (see GtkMisc). The simplest way to solve this is to set the alignment to 0.0 (left/top), and set the padding to zero. Then the origin of the image will be the same as the origin of the event box.

Sometimes an application will want to avoid depending on external data files, such as image files. GTK+ comes with a program to avoid this, called “gdk-pixbuf-csource”. This library allows you to convert an image into a C variable declaration, which can then be loaded into a GdkPixbuf using gdk_pixbuf_new_from_inline().

CSS nodes

GtkImage has a single CSS node with the name image.

Functions

gtk_image_get_icon_set ()

void
gtk_image_get_icon_set (GtkImage *image,
                        GtkIconSet **icon_set,
                        GtkIconSize *size);

gtk_image_get_icon_set has been deprecated since version 3.10 and should not be used in newly-written code.

Use gtk_image_get_icon_name() instead.

Gets the icon set and size being displayed by the GtkImage. The storage type of the image must be GTK_IMAGE_EMPTY or GTK_IMAGE_ICON_SET (see gtk_image_get_storage_type()).

Parameters

image

a GtkImage

 

icon_set

location to store a GtkIconSet, or NULL.

[out][transfer none][allow-none]

size

location to store a stock icon size (GtkIconSize), or NULL.

[out][allow-none][type int]

gtk_image_get_pixbuf ()

GdkPixbuf *
gtk_image_get_pixbuf (GtkImage *image);

Gets the GdkPixbuf being displayed by the GtkImage. The storage type of the image must be GTK_IMAGE_EMPTY or GTK_IMAGE_PIXBUF (see gtk_image_get_storage_type()). The caller of this function does not own a reference to the returned pixbuf.

Parameters

image

a GtkImage

 

Returns

the displayed pixbuf, or NULL if the image is empty.

[nullable][transfer none]


gtk_image_get_stock ()

void
gtk_image_get_stock (GtkImage *image,
                     gchar **stock_id,
                     GtkIconSize *size);

gtk_image_get_stock has been deprecated since version 3.10 and should not be used in newly-written code.

Use gtk_image_get_icon_name() instead.

Gets the stock icon name and size being displayed by the GtkImage. The storage type of the image must be GTK_IMAGE_EMPTY or GTK_IMAGE_STOCK (see gtk_image_get_storage_type()). The returned string is owned by the GtkImage and should not be freed.

Parameters

image

a GtkImage

 

stock_id

place to store a stock icon name, or NULL.

[out][transfer none][allow-none]

size

place to store a stock icon size (GtkIconSize), or NULL.

[out][allow-none][type int]

gtk_image_get_animation ()

GdkPixbufAnimation *
gtk_image_get_animation (GtkImage *image);

Gets the GdkPixbufAnimation being displayed by the GtkImage. The storage type of the image must be GTK_IMAGE_EMPTY or GTK_IMAGE_ANIMATION (see gtk_image_get_storage_type()). The caller of this function does not own a reference to the returned animation.

Parameters

image

a GtkImage

 

Returns

the displayed animation, or NULL if the image is empty.

[nullable][transfer none]


gtk_image_get_icon_name ()

void
gtk_image_get_icon_name (GtkImage *image,
                         const gchar **icon_name,
                         GtkIconSize *size);

Gets the icon name and size being displayed by the GtkImage. The storage type of the image must be GTK_IMAGE_EMPTY or GTK_IMAGE_ICON_NAME (see gtk_image_get_storage_type()). The returned string is owned by the GtkImage and should not be freed.

Parameters

image

a GtkImage

 

icon_name

place to store an icon name, or NULL.

[out][transfer none][allow-none]

size

place to store an icon size (GtkIconSize), or NULL.

[out][allow-none][type int]

Since: 2.6


gtk_image_get_gicon ()

void
gtk_image_get_gicon (GtkImage *image,
                     GIcon **gicon,
                     GtkIconSize *size);

Gets the GIcon and size being displayed by the GtkImage. The storage type of the image must be GTK_IMAGE_EMPTY or GTK_IMAGE_GICON (see gtk_image_get_storage_type()). The caller of this function does not own a reference to the returned GIcon.

Parameters

image

a GtkImage

 

gicon

place to store a GIcon, or NULL.

[out][transfer none][allow-none]

size

place to store an icon size (GtkIconSize), or NULL.

[out][allow-none][type int]

Since: 2.14


gtk_image_get_storage_type ()

GtkImageType
gtk_image_get_storage_type (GtkImage *image);

Gets the type of representation being used by the GtkImage to store image data. If the GtkImage has no image data, the return value will be GTK_IMAGE_EMPTY.

Parameters

image

a GtkImage

 

Returns

image representation being used


gtk_image_new_from_file ()

GtkWidget *
gtk_image_new_from_file (const gchar *filename);

Creates a new GtkImage displaying the file filename . If the file isn’t found or can’t be loaded, the resulting GtkImage will display a “broken image” icon. This function never returns NULL, it always returns a valid GtkImage widget.

If the file contains an animation, the image will contain an animation.

If you need to detect failures to load the file, use gdk_pixbuf_new_from_file() to load the file yourself, then create the GtkImage from the pixbuf. (Or for animations, use gdk_pixbuf_animation_new_from_file()).

The storage type (gtk_image_get_storage_type()) of the returned image is not defined, it will be whatever is appropriate for displaying the file.

Parameters

filename

a filename.

[type filename]

Returns

a new GtkImage


gtk_image_new_from_icon_set ()

GtkWidget *
gtk_image_new_from_icon_set (GtkIconSet *icon_set,
                             GtkIconSize size);

gtk_image_new_from_icon_set has been deprecated since version 3.10 and should not be used in newly-written code.

Use gtk_image_new_from_icon_name() instead.

Creates a GtkImage displaying an icon set. Sample stock sizes are GTK_ICON_SIZE_MENU, GTK_ICON_SIZE_SMALL_TOOLBAR. Instead of using this function, usually it’s better to create a GtkIconFactory, put your icon sets in the icon factory, add the icon factory to the list of default factories with gtk_icon_factory_add_default(), and then use gtk_image_new_from_stock(). This will allow themes to override the icon you ship with your application.

The GtkImage does not assume a reference to the icon set; you still need to unref it if you own references. GtkImage will add its own reference rather than adopting yours.

Parameters

icon_set

a GtkIconSet

 

size

a stock icon size (GtkIconSize).

[type int]

Returns

a new GtkImage


gtk_image_new_from_pixbuf ()

GtkWidget *
gtk_image_new_from_pixbuf (GdkPixbuf *pixbuf);

Creates a new GtkImage displaying pixbuf . The GtkImage does not assume a reference to the pixbuf; you still need to unref it if you own references. GtkImage will add its own reference rather than adopting yours.

Note that this function just creates an GtkImage from the pixbuf. The GtkImage created will not react to state changes. Should you want that, you should use gtk_image_new_from_icon_name().

Parameters

pixbuf

a GdkPixbuf, or NULL.

[allow-none]

Returns

a new GtkImage


gtk_image_new_from_stock ()

GtkWidget *
gtk_image_new_from_stock (const gchar *stock_id,
                          GtkIconSize size);

gtk_image_new_from_stock has been deprecated since version 3.10 and should not be used in newly-written code.

Use gtk_image_new_from_icon_name() instead.

Creates a GtkImage displaying a stock icon. Sample stock icon names are GTK_STOCK_OPEN, GTK_STOCK_QUIT. Sample stock sizes are GTK_ICON_SIZE_MENU, GTK_ICON_SIZE_SMALL_TOOLBAR. If the stock icon name isn’t known, the image will be empty. You can register your own stock icon names, see gtk_icon_factory_add_default() and gtk_icon_factory_add().

Parameters

stock_id

a stock icon name

 

size

a stock icon size (GtkIconSize).

[type int]

Returns

a new GtkImage displaying the stock icon


gtk_image_new_from_animation ()

GtkWidget *
gtk_image_new_from_animation (GdkPixbufAnimation *animation);

Creates a GtkImage displaying the given animation. The GtkImage does not assume a reference to the animation; you still need to unref it if you own references. GtkImage will add its own reference rather than adopting yours.

Note that the animation frames are shown using a timeout with G_PRIORITY_DEFAULT. When using animations to indicate busyness, keep in mind that the animation will only be shown if the main loop is not busy with something that has a higher priority.

Parameters

animation

an animation

 

Returns

a new GtkImage widget


gtk_image_new_from_icon_name ()

GtkWidget *
gtk_image_new_from_icon_name (const gchar *icon_name,
                              GtkIconSize size);

Creates a GtkImage displaying an icon from the current icon theme. If the icon name isn’t known, a “broken image” icon will be displayed instead. If the current icon theme is changed, the icon will be updated appropriately.

Parameters

icon_name

an icon name

 

size

a stock icon size (GtkIconSize).

[type int]

Returns

a new GtkImage displaying the themed icon

Since: 2.6


gtk_image_new_from_gicon ()

GtkWidget *
gtk_image_new_from_gicon (GIcon *icon,
                          GtkIconSize size);

Creates a GtkImage displaying an icon from the current icon theme. If the icon name isn’t known, a “broken image” icon will be displayed instead. If the current icon theme is changed, the icon will be updated appropriately.

Parameters

icon

an icon

 

size

a stock icon size (GtkIconSize).

[type int]

Returns

a new GtkImage displaying the themed icon

Since: 2.14


gtk_image_new_from_resource ()

GtkWidget *
gtk_image_new_from_resource (const gchar *resource_path);

Creates a new GtkImage displaying the resource file resource_path . If the file isn’t found or can’t be loaded, the resulting GtkImage will display a “broken image” icon. This function never returns NULL, it always returns a valid GtkImage widget.

If the file contains an animation, the image will contain an animation.

If you need to detect failures to load the file, use gdk_pixbuf_new_from_file() to load the file yourself, then create the GtkImage from the pixbuf. (Or for animations, use gdk_pixbuf_animation_new_from_file()).

The storage type (gtk_image_get_storage_type()) of the returned image is not defined, it will be whatever is appropriate for displaying the file.

Parameters

resource_path

a resource path

 

Returns

a new GtkImage

Since: 3.4


gtk_image_new_from_surface ()

GtkWidget *
gtk_image_new_from_surface (cairo_surface_t *surface);

Creates a new GtkImage displaying surface . The GtkImage does not assume a reference to the surface; you still need to unref it if you own references. GtkImage will add its own reference rather than adopting yours.

Parameters

surface

a cairo_surface_t, or NULL.

[allow-none]

Returns

a new GtkImage

Since: 3.10


gtk_image_set_from_file ()

void
gtk_image_set_from_file (GtkImage *image,
                         const gchar *filename);

See gtk_image_new_from_file() for details.

Parameters

image

a GtkImage

 

filename

a filename or NULL.

[type filename][allow-none]

gtk_image_set_from_icon_set ()

void
gtk_image_set_from_icon_set (GtkImage *image,
                             GtkIconSet *icon_set,
                             GtkIconSize size);

gtk_image_set_from_icon_set has been deprecated since version 3.10 and should not be used in newly-written code.

Use gtk_image_set_from_icon_name() instead.

See gtk_image_new_from_icon_set() for details.

Parameters

image

a GtkImage

 

icon_set

a GtkIconSet

 

size

a stock icon size (GtkIconSize).

[type int]

gtk_image_set_from_pixbuf ()

void
gtk_image_set_from_pixbuf (GtkImage *image,
                           GdkPixbuf *pixbuf);

See gtk_image_new_from_pixbuf() for details.

Parameters

image

a GtkImage

 

pixbuf

a GdkPixbuf or NULL.

[allow-none]

gtk_image_set_from_stock ()

void
gtk_image_set_from_stock (GtkImage *image,
                          const gchar *stock_id,
                          GtkIconSize size);

gtk_image_set_from_stock has been deprecated since version 3.10 and should not be used in newly-written code.

Use gtk_image_set_from_icon_name() instead.

See gtk_image_new_from_stock() for details.

Parameters

image

a GtkImage

 

stock_id

a stock icon name

 

size

a stock icon size (GtkIconSize).

[type int]

gtk_image_set_from_animation ()

void
gtk_image_set_from_animation (GtkImage *image,
                              GdkPixbufAnimation *animation);

Causes the GtkImage to display the given animation (or display nothing, if you set the animation to NULL).

Parameters

image

a GtkImage

 

animation

the GdkPixbufAnimation

 

gtk_image_set_from_icon_name ()

void
gtk_image_set_from_icon_name (GtkImage *image,
                              const gchar *icon_name,
                              GtkIconSize size);

See gtk_image_new_from_icon_name() for details.

Parameters

image

a GtkImage

 

icon_name

an icon name

 

size

an icon size (GtkIconSize).

[type int]

Since: 2.6


gtk_image_set_from_gicon ()

void
gtk_image_set_from_gicon (GtkImage *image,
                          GIcon *icon,
                          GtkIconSize size);

See gtk_image_new_from_gicon() for details.

Parameters

image

a GtkImage

 

icon

an icon

 

size

an icon size (GtkIconSize).

[type int]

Since: 2.14


gtk_image_set_from_resource ()

void
gtk_image_set_from_resource (GtkImage *image,
                             const gchar *resource_path);

See gtk_image_new_from_resource() for details.

Parameters

image

a GtkImage

 

resource_path

a resource path or NULL.

[allow-none]

gtk_image_set_from_surface ()

void
gtk_image_set_from_surface (GtkImage *image,
                            cairo_surface_t *surface);

See gtk_image_new_from_surface() for details.

Parameters

image

a GtkImage

 

surface

a cairo_surface_t

 

Since: 3.10


gtk_image_clear ()

void
gtk_image_clear (GtkImage *image);

Resets the image to be empty.

Parameters

image

a GtkImage

 

Since: 2.8


gtk_image_new ()

GtkWidget *
gtk_image_new (void);

Creates a new empty GtkImage widget.

Returns

a newly created GtkImage widget.


gtk_image_set_pixel_size ()

void
gtk_image_set_pixel_size (GtkImage *image,
                          gint pixel_size);

Sets the pixel size to use for named icons. If the pixel size is set to a value != -1, it is used instead of the icon size set by gtk_image_set_from_icon_name().

Parameters

image

a GtkImage

 

pixel_size

the new pixel size

 

Since: 2.6


gtk_image_get_pixel_size ()

gint
gtk_image_get_pixel_size (GtkImage *image);

Gets the pixel size used for named icons.

Parameters

image

a GtkImage

 

Returns

the pixel size used for named icons.

Since: 2.6

Types and Values

struct GtkImage

struct GtkImage;

This struct contain private data only and should be accessed by the functions below.


enum GtkImageType

Describes the image data representation used by a GtkImage. If you want to get the image from the widget, you can only get the currently-stored representation. e.g. if the gtk_image_get_storage_type() returns GTK_IMAGE_PIXBUF, then you can call gtk_image_get_pixbuf() but not gtk_image_get_stock(). For empty images, you can request any storage type (call any of the "get" functions), but they will all return NULL values.

Members

GTK_IMAGE_EMPTY

there is no image displayed by the widget

 

GTK_IMAGE_PIXBUF

the widget contains a GdkPixbuf

 

GTK_IMAGE_STOCK

the widget contains a stock item name

 

GTK_IMAGE_ICON_SET

the widget contains a GtkIconSet

 

GTK_IMAGE_ANIMATION

the widget contains a GdkPixbufAnimation

 

GTK_IMAGE_ICON_NAME

the widget contains a named icon. This image type was added in GTK+ 2.6

 

GTK_IMAGE_GICON

the widget contains a GIcon. This image type was added in GTK+ 2.14

 

GTK_IMAGE_SURFACE

the widget contains a cairo_surface_t. This image type was added in GTK+ 3.10

 

Property Details

The “file” property

  “file”                     gchar *

Filename to load and display.

Flags: Read / Write

Default value: NULL


The “gicon” property

  “gicon”                    GIcon *

The GIcon displayed in the GtkImage. For themed icons, If the icon theme is changed, the image will be updated automatically.

Flags: Read / Write

Since: 2.14


The “icon-name” property

  “icon-name”                gchar *

The name of the icon in the icon theme. If the icon theme is changed, the image will be updated automatically.

Flags: Read / Write

Default value: NULL

Since: 2.6


The “icon-set” property

  “icon-set”                 GtkIconSet *

Icon set to display.

GtkImage:icon-set has been deprecated since version 3.10 and should not be used in newly-written code.

Use “icon-name” instead.

Flags: Read / Write


The “icon-size” property

  “icon-size”                gint

Symbolic size to use for stock icon, icon set or named icon.

Flags: Read / Write

Allowed values: >= 0

Default value: 4


The “pixbuf” property

  “pixbuf”                   GdkPixbuf *

A GdkPixbuf to display.

Flags: Read / Write


The “pixbuf-animation” property

  “pixbuf-animation”         GdkPixbufAnimation *

GdkPixbufAnimation to display.

Flags: Read / Write


The “pixel-size” property

  “pixel-size”               gint

The "pixel-size" property can be used to specify a fixed size overriding the “icon-size” property for images of type GTK_IMAGE_ICON_NAME.

Flags: Read / Write

Allowed values: >= -1

Default value: -1

Since: 2.6


The “resource” property

  “resource”                 gchar *

A path to a resource file to display.

Flags: Read / Write

Default value: NULL

Since: 3.8


The “stock” property

  “stock”                    gchar *

Stock ID for a stock image to display.

GtkImage:stock has been deprecated since version 3.10 and should not be used in newly-written code.

Use “icon-name” instead.

Flags: Read / Write

Default value: NULL


The “storage-type” property

  “storage-type”             GtkImageType

The representation being used for image data.

Flags: Read

Default value: GTK_IMAGE_EMPTY


The “surface” property

  “surface”                  CairoSurface *

A cairo_surface_t to display.

Flags: Read / Write


The “use-fallback” property

  “use-fallback”             gboolean

Whether the icon displayed in the GtkImage will use standard icon names fallback. The value of this property is only relevant for images of type GTK_IMAGE_ICON_NAME and GTK_IMAGE_GICON.

Flags: Read / Write

Default value: FALSE

Since: 3.0

See Also

GdkPixbuf