forked from AuroraMiddleware/gtk
1a48dcb14f
Tue Feb 24 14:45:03 2004 Owen Taylor <otaylor@redhat.com>
* === Released 2.3.3 ===
* configure.in: Version 2.3.3, interface age 0.
* NEWS: Finish updates for 2.3.3.
412 lines
7.6 KiB
Plaintext
412 lines
7.6 KiB
Plaintext
<!-- ##### SECTION Title ##### -->
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GtkImage
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<!-- ##### SECTION Short_Description ##### -->
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A widget displaying an image
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<!-- ##### SECTION Long_Description ##### -->
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<para>
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The #GtkImage widget displays an image. Various kinds of object
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can be displayed as an image; most typically, you would load a
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#GdkPixbuf ("pixel buffer") from a file, and then display that.
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There's a convenience function to do this, gtk_image_new_from_file(),
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used as follows:
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<informalexample><programlisting>
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GtkWidget *image;
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image = gtk_image_new_from_file ("myfile.png");
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</programlisting></informalexample>
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If the file isn't loaded successfully, the image will contain a
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"broken image" icon similar to that used in many web browsers.
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If you want to handle errors in loading the file yourself,
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for example by displaying an error message, then load the image with
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gdk_pixbuf_new_from_file(), then create the #GtkImage with
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gtk_image_new_from_pixbuf().
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</para>
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<para>
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The image file may contain an animation, if so the #GtkImage will
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display an animation (#GdkPixbufAnimation) instead of a static image.
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</para>
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<para>
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#GtkImage is a subclass of #GtkMisc, which implies that you can
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align it (center, left, right) and add padding to it, using
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#GtkMisc methods.
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</para>
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<para>
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#GtkImage is a "no window" widget (has no #GdkWindow of its own),
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so by default does not receive events. If you want to receive events
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on the image, such as button clicks, place the image inside a
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#GtkEventBox, then connect to the event signals on the event box.
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<example>
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<title>Handling button press events on a
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<structname>GtkImage</structname>.</title>
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<programlisting>
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static gboolean
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button_press_callback (GtkWidget *event_box,
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GdkEventButton *event,
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gpointer data)
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{
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g_print ("Event box clicked at coordinates %f,%f\n",
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event->x, event->y);
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/* Returning TRUE means we handled the event, so the signal
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* emission should be stopped (don't call any further
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* callbacks that may be connected). Return FALSE
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* to continue invoking callbacks.
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*/
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return TRUE;
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}
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static GtkWidget*
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create_image (void)
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{
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GtkWidget *image;
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GtkWidget *event_box;
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image = gtk_image_new_from_file ("myfile.png");
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event_box = gtk_event_box_new (<!-- -->);
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gtk_container_add (GTK_CONTAINER (event_box), image);
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g_signal_connect (G_OBJECT (event_box),
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"button_press_event",
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G_CALLBACK (button_press_callback),
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image);
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return image;
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}
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</programlisting>
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</example>
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</para>
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<para>
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When handling events on the event box, keep in mind that coordinates
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in the image may be different from event box coordinates due to
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the alignment and padding settings on the image (see #GtkMisc).
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The simplest way to solve this is to set the alignment to 0.0
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(left/top), and set the padding to zero. Then the origin of
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the image will be the same as the origin of the event box.
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</para>
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<para>
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Sometimes an application will want to avoid depending on external data
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files, such as image files. GTK+ comes with a program to avoid this,
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called <application>gdk-pixbuf-csource</application>. This program
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allows you to convert an image into a C variable declaration, which
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can then be loaded into a #GdkPixbuf using
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gdk_pixbuf_new_from_inline().
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</para>
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<!-- ##### SECTION See_Also ##### -->
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<para>
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#GdkPixbuf
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</para>
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<!-- ##### STRUCT GtkImage ##### -->
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<para>
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This struct contain private data only and should be accessed by the functions
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below.
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</para>
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<!-- ##### ARG GtkImage:file ##### -->
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<para>
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</para>
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<!-- ##### ARG GtkImage:icon-set ##### -->
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<para>
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</para>
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<!-- ##### ARG GtkImage:icon-size ##### -->
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<para>
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</para>
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<!-- ##### ARG GtkImage:image ##### -->
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<para>
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</para>
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<!-- ##### ARG GtkImage:mask ##### -->
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<para>
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</para>
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<!-- ##### ARG GtkImage:pixbuf ##### -->
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<para>
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</para>
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<!-- ##### ARG GtkImage:pixbuf-animation ##### -->
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<para>
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</para>
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<!-- ##### ARG GtkImage:pixmap ##### -->
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<para>
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</para>
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<!-- ##### ARG GtkImage:stock ##### -->
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<para>
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</para>
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<!-- ##### ARG GtkImage:storage-type ##### -->
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<para>
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</para>
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<!-- ##### ENUM GtkImageType ##### -->
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<para>
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Describes the image data representation used by a #GtkImage. If you
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want to get the image from the widget, you can only get the
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currently-stored representation. e.g. if the
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gtk_image_get_storage_type() returns #GTK_IMAGE_PIXBUF, then you can
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call gtk_image_get_pixbuf() but not gtk_image_get_stock(). For empty
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images, you can request any storage type (call any of the "get"
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functions), but they will all return %NULL values.
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</para>
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@GTK_IMAGE_EMPTY: there is no image displayed by the widget
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@GTK_IMAGE_PIXMAP: the widget contains a #GdkPixmap
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@GTK_IMAGE_IMAGE: the widget contains a #GdkImage
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@GTK_IMAGE_PIXBUF: the widget contains a #GdkPixbuf
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@GTK_IMAGE_STOCK: the widget contains a stock icon name (see <xref linkend="gtk-Stock-Items"/>)
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@GTK_IMAGE_ICON_SET: the widget contains a #GtkIconSet
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@GTK_IMAGE_ANIMATION: the widget contains a #GdkPixbufAnimation
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<!-- ##### FUNCTION gtk_image_get_icon_set ##### -->
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<para>
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</para>
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@image:
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@icon_set:
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@size:
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<!-- ##### FUNCTION gtk_image_get_image ##### -->
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<para>
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</para>
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@image:
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@gdk_image:
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@mask:
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<!-- ##### FUNCTION gtk_image_get_pixbuf ##### -->
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<para>
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</para>
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@image:
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@Returns:
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<!-- ##### FUNCTION gtk_image_get_pixmap ##### -->
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<para>
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</para>
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@image:
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@pixmap:
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@mask:
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<!-- ##### FUNCTION gtk_image_get_stock ##### -->
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<para>
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</para>
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@image:
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@stock_id:
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@size:
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<!-- ##### FUNCTION gtk_image_get_animation ##### -->
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<para>
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</para>
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@image:
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@Returns:
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<!-- ##### FUNCTION gtk_image_get_storage_type ##### -->
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<para>
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</para>
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@image:
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@Returns:
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<!-- ##### FUNCTION gtk_image_new_from_file ##### -->
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<para>
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</para>
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@filename:
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@Returns:
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<!-- ##### FUNCTION gtk_image_new_from_icon_set ##### -->
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<para>
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</para>
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@icon_set:
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@size:
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@Returns:
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<!-- ##### FUNCTION gtk_image_new_from_image ##### -->
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<para>
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</para>
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@image:
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@mask:
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@Returns:
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<!-- ##### FUNCTION gtk_image_new_from_pixbuf ##### -->
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<para>
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</para>
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@pixbuf:
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@Returns:
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<!-- ##### FUNCTION gtk_image_new_from_pixmap ##### -->
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<para>
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</para>
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@pixmap:
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@mask:
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@Returns:
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<!-- ##### FUNCTION gtk_image_new_from_stock ##### -->
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<para>
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</para>
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@stock_id:
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@size:
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@Returns:
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<!-- ##### FUNCTION gtk_image_new_from_animation ##### -->
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<para>
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</para>
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@animation:
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@Returns:
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<!-- ##### FUNCTION gtk_image_set_from_file ##### -->
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<para>
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</para>
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@image:
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@filename:
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<!-- ##### FUNCTION gtk_image_set_from_icon_set ##### -->
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<para>
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</para>
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@image:
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@icon_set:
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@size:
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<!-- ##### FUNCTION gtk_image_set_from_image ##### -->
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<para>
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</para>
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@image:
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@gdk_image:
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@mask:
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<!-- ##### FUNCTION gtk_image_set_from_pixbuf ##### -->
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<para>
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</para>
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@image:
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@pixbuf:
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<!-- ##### FUNCTION gtk_image_set_from_pixmap ##### -->
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<para>
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</para>
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@image:
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@pixmap:
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@mask:
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<!-- ##### FUNCTION gtk_image_set_from_stock ##### -->
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<para>
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</para>
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@image:
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@stock_id:
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@size:
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<!-- ##### FUNCTION gtk_image_set_from_animation ##### -->
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<para>
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</para>
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@image:
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@animation:
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<!-- ##### FUNCTION gtk_image_new ##### -->
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<para>
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</para>
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@Returns: the #GtkImage
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<!-- # Unused Parameters # -->
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@val:
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@mask: a #GdkBitmap that indicates which parts of the image should be transparent.
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<!-- ##### FUNCTION gtk_image_set ##### -->
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<para>
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Sets the #GtkImage.
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</para>
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@image: a #GdkPixmap
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@val:
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@mask: a #GdkBitmap that indicates which parts of the image should be transparent.
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<!-- ##### FUNCTION gtk_image_get ##### -->
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<para>
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Gets the #GtkImage.
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</para>
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@image: a #GdkPixmap
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@val:
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@mask: a #GdkBitmap that indicates which parts of the image should be transparent.
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