forked from AuroraMiddleware/gtk
7918eaf677
When a file set via gtk_picture_set_file() can't be loaded, just silently don't load it. Reftest picture-load-invalid-file added for that case.
988 lines
26 KiB
C
988 lines
26 KiB
C
/*
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* Copyright © 2018 Benjamin Otte
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*
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* Authors: Benjamin Otte <otte@gnome.org>
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*/
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#include "config.h"
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#include "gtkpicture.h"
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#include "gtkcssnodeprivate.h"
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#include "gtkcssnumbervalueprivate.h"
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#include "gtkcssstyleprivate.h"
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#include "gtkintl.h"
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#include "gtkprivate.h"
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#include "gtkscalerprivate.h"
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#include "gtksnapshot.h"
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#include "gtkwidgetprivate.h"
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#include "a11y/gtkpictureaccessibleprivate.h"
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/**
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* SECTION:gtkpicture
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* @Short_description: A widget displaying a #GdkPaintable
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* @Title: GtkPicture
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* @SeeAlso: #GdkPaintable, #GtkImage
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*
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* The #GtkPicture widget displays a #GdkPaintable. Many convenience functions
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* are provided to make pictures simple to use. For example, if you want to load
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* an image from a file, and then display that, there’s a convenience function
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* to do this:
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* |[<!-- language="C" -->
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* GtkWidget *widget;
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* widget = gtk_picture_new_for_filename ("myfile.png");
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* ]|
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* If the file isn’t loaded successfully, the picture 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_texture_new_from_file(), then create the #GtkPicture with
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* gtk_picture_new_for_paintable().
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*
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* Sometimes an application will want to avoid depending on external data
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* files, such as image files. See the documentation of #GResource for details.
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* In this case, gtk_picture_new_for_resource() and gtk_picture_set_resource()
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* should be used.
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*
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* # CSS nodes
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*
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* GtkPicture has a single CSS node with the name picture.
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*/
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enum
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{
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PROP_0,
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PROP_PAINTABLE,
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PROP_FILE,
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PROP_ALTERNATIVE_TEXT,
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PROP_KEEP_ASPECT_RATIO,
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PROP_CAN_SHRINK,
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NUM_PROPERTIES
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};
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struct _GtkPicture
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{
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GtkWidget parent_instance;
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GdkPaintable *paintable;
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GFile *file;
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char *alternative_text;
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guint keep_aspect_ratio : 1;
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guint can_shrink : 1;
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};
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struct _GtkPictureClass
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{
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GtkWidgetClass parent_class;
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};
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static GParamSpec *properties[NUM_PROPERTIES] = { NULL, };
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G_DEFINE_TYPE (GtkPicture, gtk_picture, GTK_TYPE_WIDGET)
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static void
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gtk_picture_snapshot (GtkWidget *widget,
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GtkSnapshot *snapshot)
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{
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GtkPicture *self = GTK_PICTURE (widget);
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double ratio;
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int x, y, width, height;
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double w, h;
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if (self->paintable == NULL)
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return;
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width = gtk_widget_get_width (widget);
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height = gtk_widget_get_height (widget);
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ratio = gdk_paintable_get_intrinsic_aspect_ratio (self->paintable);
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if (!self->keep_aspect_ratio || ratio == 0)
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{
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gdk_paintable_snapshot (self->paintable, snapshot, width, height);
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}
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else
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{
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double picture_ratio = (double) width / height;
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if (ratio > picture_ratio)
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{
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w = width;
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h = width / ratio;
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}
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else
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{
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w = height * ratio;
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h = height;
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}
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x = (width - ceil (w)) / 2;
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y = floor(height - ceil (h)) / 2;
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gtk_snapshot_save (snapshot);
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gtk_snapshot_translate (snapshot, &GRAPHENE_POINT_INIT (x, y));
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gdk_paintable_snapshot (self->paintable, snapshot, w, h);
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gtk_snapshot_restore (snapshot);
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}
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}
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static GtkSizeRequestMode
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gtk_picture_get_request_mode (GtkWidget *widget)
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{
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return GTK_SIZE_REQUEST_HEIGHT_FOR_WIDTH;
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}
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static void
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gtk_picture_measure (GtkWidget *widget,
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GtkOrientation orientation,
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int for_size,
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int *minimum,
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int *natural,
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int *minimum_baseline,
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int *natural_baseline)
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{
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GtkPicture *self = GTK_PICTURE (widget);
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double min_width, min_height, nat_width, nat_height;
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double default_size;
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if (self->paintable == NULL)
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{
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*minimum = 0;
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*natural = 0;
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return;
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}
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default_size = _gtk_css_number_value_get (gtk_css_style_get_value (gtk_css_node_get_style (gtk_widget_get_css_node (widget)), GTK_CSS_PROPERTY_ICON_SIZE), 100);
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if (self->can_shrink)
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{
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min_width = min_height = 0;
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}
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else
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{
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gdk_paintable_compute_concrete_size (self->paintable,
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0, 0,
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default_size, default_size,
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&min_width, &min_height);
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}
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if (orientation == GTK_ORIENTATION_HORIZONTAL)
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{
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gdk_paintable_compute_concrete_size (self->paintable,
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0,
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for_size < 0 ? 0 : for_size,
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default_size, default_size,
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&nat_width, &nat_height);
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*minimum = ceil (min_width);
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*natural = ceil (nat_width);
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}
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else
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{
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gdk_paintable_compute_concrete_size (self->paintable,
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for_size < 0 ? 0 : for_size,
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0,
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default_size, default_size,
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&nat_width, &nat_height);
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*minimum = ceil (min_height);
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*natural = ceil (nat_height);
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}
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}
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static void
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gtk_picture_set_property (GObject *object,
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guint prop_id,
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const GValue *value,
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GParamSpec *pspec)
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{
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GtkPicture *self = GTK_PICTURE (object);
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switch (prop_id)
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{
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case PROP_PAINTABLE:
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gtk_picture_set_paintable (self, g_value_get_object (value));
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break;
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case PROP_FILE:
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gtk_picture_set_file (self, g_value_get_object (value));
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break;
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case PROP_ALTERNATIVE_TEXT:
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gtk_picture_set_alternative_text (self, g_value_get_string (value));
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break;
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case PROP_KEEP_ASPECT_RATIO:
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gtk_picture_set_keep_aspect_ratio (self, g_value_get_boolean (value));
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break;
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case PROP_CAN_SHRINK:
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gtk_picture_set_can_shrink (self, g_value_get_boolean (value));
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gtk_picture_get_property (GObject *object,
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guint prop_id,
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GValue *value,
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GParamSpec *pspec)
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{
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GtkPicture *self = GTK_PICTURE (object);
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switch (prop_id)
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{
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case PROP_PAINTABLE:
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g_value_set_object (value, self->paintable);
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break;
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case PROP_FILE:
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g_value_set_object (value, self->file);
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break;
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case PROP_ALTERNATIVE_TEXT:
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g_value_set_string (value, self->alternative_text);
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break;
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case PROP_KEEP_ASPECT_RATIO:
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g_value_set_boolean (value, self->keep_aspect_ratio);
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break;
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case PROP_CAN_SHRINK:
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g_value_set_boolean (value, self->can_shrink);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gtk_picture_dispose (GObject *object)
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{
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GtkPicture *self = GTK_PICTURE (object);
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gtk_picture_set_paintable (self, NULL);
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g_clear_object (&self->file);
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G_OBJECT_CLASS (gtk_picture_parent_class)->dispose (object);
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};
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static void
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gtk_picture_class_init (GtkPictureClass *class)
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS (class);
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GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
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gobject_class->set_property = gtk_picture_set_property;
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gobject_class->get_property = gtk_picture_get_property;
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gobject_class->dispose = gtk_picture_dispose;
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widget_class->snapshot = gtk_picture_snapshot;
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widget_class->get_request_mode = gtk_picture_get_request_mode;
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widget_class->measure = gtk_picture_measure;
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/**
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* GtkPicture:paintable:
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*
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* The #GdkPaintable to be displayed by this #GtkPicture.
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*/
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properties[PROP_PAINTABLE] =
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g_param_spec_object ("paintable",
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P_("Paintable"),
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P_("The GdkPaintable to display"),
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GDK_TYPE_PAINTABLE,
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GTK_PARAM_READWRITE | G_PARAM_EXPLICIT_NOTIFY);
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/**
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* GtkPicture:file:
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*
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* The #GFile that is displayed or %NULL if none.
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*/
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properties[PROP_FILE] =
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g_param_spec_object ("file",
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P_("File"),
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P_("File to load and display"),
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G_TYPE_FILE,
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GTK_PARAM_READWRITE | G_PARAM_EXPLICIT_NOTIFY);
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/**
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* GtkPicture:alternative-text:
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*
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* The alternative textual description for the picture.
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*/
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properties[PROP_ALTERNATIVE_TEXT] =
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g_param_spec_string ("alternative-text",
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P_("Alternative text"),
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P_("The alternative textual description"),
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NULL,
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GTK_PARAM_READWRITE | G_PARAM_EXPLICIT_NOTIFY);
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/**
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* GtkPicture:keep-aspect-ratio:
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*
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* Whether the GtkPicture will render its contents trying to preserve the aspect
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* ratio of the contents.
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*/
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properties[PROP_KEEP_ASPECT_RATIO] =
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g_param_spec_boolean ("keep-aspect-ratio",
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P_("Keep aspect ratio"),
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P_("Render contents respecting the aspect ratio"),
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TRUE,
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GTK_PARAM_READWRITE | G_PARAM_EXPLICIT_NOTIFY);
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/**
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* GtkPicture:can-shrink
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*
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* If the #GtkPicture can be made smaller than the self it contains.
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*/
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properties[PROP_CAN_SHRINK] =
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g_param_spec_boolean ("can-shrink",
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P_("Can shrink"),
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P_("Allow self to be smaller than contents"),
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TRUE,
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GTK_PARAM_READWRITE | G_PARAM_EXPLICIT_NOTIFY);
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g_object_class_install_properties (gobject_class, NUM_PROPERTIES, properties);
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gtk_widget_class_set_accessible_type (widget_class, GTK_TYPE_PICTURE_ACCESSIBLE);
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gtk_widget_class_set_css_name (widget_class, I_("picture"));
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}
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static void
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gtk_picture_init (GtkPicture *self)
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{
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gtk_widget_set_has_surface (GTK_WIDGET (self), FALSE);
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self->can_shrink = TRUE;
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self->keep_aspect_ratio = TRUE;
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}
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/**
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* gtk_picture_new:
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*
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* Creates a new empty #GtkPicture widget.
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*
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* Returns: a newly created #GtkPicture widget.
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**/
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GtkWidget*
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gtk_picture_new (void)
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{
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return g_object_new (GTK_TYPE_PICTURE, NULL);
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}
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/**
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* gtk_picture_new_for_paintable:
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* @paintable: (nullable): a #GdkPaintable, or %NULL
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*
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* Creates a new #GtkPicture displaying @paintable.
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*
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* The #GtkPicture will track changes to the @paintable and update
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* its size and contents in response to it.
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*
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* Returns: a new #GtkPicture
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**/
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GtkWidget*
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gtk_picture_new_for_paintable (GdkPaintable *paintable)
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{
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g_return_val_if_fail (paintable == NULL || GDK_IS_PAINTABLE (paintable), NULL);
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return g_object_new (GTK_TYPE_PICTURE,
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"paintable", paintable,
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NULL);
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}
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/**
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* gtk_picture_new_for_pixbuf:
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* @pixbuf: (nullable): a #GdkPixbuf, or %NULL
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*
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* Creates a new #GtkPicture displaying @pixbuf.
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*
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* This is a utility function that calls gtk_picture_new_for_paintable(),
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* See that function for details.
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*
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* The pixbuf must not be modified after passing it to this function.
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*
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* Returns: a new #GtkPicture
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**/
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GtkWidget*
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gtk_picture_new_for_pixbuf (GdkPixbuf *pixbuf)
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{
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GtkWidget *result;
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GdkPaintable *paintable;
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g_return_val_if_fail (pixbuf == NULL || GDK_IS_PIXBUF (pixbuf), NULL);
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if (pixbuf)
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paintable = GDK_PAINTABLE (gdk_texture_new_for_pixbuf (pixbuf));
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else
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paintable = NULL;
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result = gtk_picture_new_for_paintable (paintable);
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if (paintable)
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g_object_unref (paintable);
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return result;
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}
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/**
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* gtk_picture_new_for_file:
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* @file: (nullable): a #GFile
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*
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* Creates a new #GtkPicture displaying the given @file. If the file
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* isn’t found or can’t be loaded, the resulting #GtkPicture be empty.
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*
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* If you need to detect failures to load the file, use
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* gdk_texture_new_for_file() to load the file yourself, then create
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* the #GtkPicture from the texture.
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*
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* Returns: a new #GtkPicture
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**/
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GtkWidget*
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gtk_picture_new_for_file (GFile *file)
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{
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g_return_val_if_fail (file == NULL || G_IS_FILE (file), NULL);
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return g_object_new (GTK_TYPE_PICTURE,
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"file", file,
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NULL);
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}
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/**
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* gtk_picture_new_for_filename:
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* @filename: (type filename) (nullable): a filename
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*
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* Creates a new #GtkPicture displaying the file @filename.
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*
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* This is a utility function that calls gtk_picture_new_for_file().
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* See that function for details.
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*
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* Returns: a new #GtkPicture
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**/
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GtkWidget*
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gtk_picture_new_for_filename (const char *filename)
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{
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GtkWidget *result;
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GFile *file;
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if (filename)
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file = g_file_new_for_path (filename);
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else
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file = NULL;
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result = gtk_picture_new_for_file (file);
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if (file)
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g_object_unref (file);
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return result;
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}
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/**
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* gtk_picture_new_for_resource:
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* @resource_path: (nullable): resource path to play back
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*
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* Creates a new #GtkPicture displaying the file @filename.
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*
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* This is a utility function that calls gtk_picture_new_for_file().
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* See that function for details.
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*
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* Returns: a new #GtkPicture
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**/
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GtkWidget *
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gtk_picture_new_for_resource (const char *resource_path)
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{
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GtkWidget *result;
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GFile *file;
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if (resource_path)
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{
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char *uri, *escaped;
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escaped = g_uri_escape_string (resource_path,
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G_URI_RESERVED_CHARS_ALLOWED_IN_PATH, FALSE);
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uri = g_strconcat ("resource://", escaped, NULL);
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g_free (escaped);
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file = g_file_new_for_uri (uri);
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g_free (uri);
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}
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else
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{
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file = NULL;
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}
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result = gtk_picture_new_for_file (file);
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if (file)
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g_object_unref (file);
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return result;
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}
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typedef struct {
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gint scale_factor;
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} LoaderData;
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static void
|
||
on_loader_size_prepared (GdkPixbufLoader *loader,
|
||
gint width,
|
||
gint height,
|
||
gpointer user_data)
|
||
{
|
||
LoaderData *loader_data = user_data;
|
||
GdkPixbufFormat *format;
|
||
|
||
/* Let the regular icon helper code path handle non-scalable pictures */
|
||
format = gdk_pixbuf_loader_get_format (loader);
|
||
if (!gdk_pixbuf_format_is_scalable (format))
|
||
{
|
||
loader_data->scale_factor = 1;
|
||
return;
|
||
}
|
||
|
||
gdk_pixbuf_loader_set_size (loader,
|
||
width * loader_data->scale_factor,
|
||
height * loader_data->scale_factor);
|
||
}
|
||
|
||
static GdkPaintable *
|
||
load_scalable_with_loader (GFile *file,
|
||
gint scale_factor)
|
||
{
|
||
GdkPixbufLoader *loader;
|
||
GBytes *bytes;
|
||
GdkPixbufAnimation *animation;
|
||
GdkPaintable *result, *scaler;
|
||
LoaderData loader_data;
|
||
|
||
result = NULL;
|
||
|
||
loader = gdk_pixbuf_loader_new ();
|
||
loader_data.scale_factor = scale_factor;
|
||
|
||
g_signal_connect (loader, "size-prepared", G_CALLBACK (on_loader_size_prepared), &loader_data);
|
||
|
||
bytes = g_file_load_bytes (file, NULL, NULL, NULL);
|
||
if (bytes == NULL)
|
||
goto out1;
|
||
|
||
if (!gdk_pixbuf_loader_write_bytes (loader, bytes, NULL))
|
||
goto out2;
|
||
|
||
if (!gdk_pixbuf_loader_close (loader, NULL))
|
||
goto out2;
|
||
|
||
animation = gdk_pixbuf_loader_get_animation (loader);
|
||
if (animation == NULL)
|
||
goto out2;
|
||
|
||
result = GDK_PAINTABLE (gdk_texture_new_for_pixbuf (gdk_pixbuf_animation_get_static_image (animation)));
|
||
scaler = gtk_scaler_new (result, loader_data.scale_factor);
|
||
g_object_unref (result);
|
||
result = scaler;
|
||
|
||
out2:
|
||
g_bytes_unref (bytes);
|
||
out1:
|
||
gdk_pixbuf_loader_close (loader, NULL);
|
||
g_object_unref (loader);
|
||
|
||
return result;
|
||
}
|
||
|
||
/**
|
||
* gtk_picture_set_file:
|
||
* @self: a #GtkPicture
|
||
* @file: (nullable): a %GFile or %NULL
|
||
*
|
||
* Makes @self load and display @file.
|
||
*
|
||
* See gtk_picture_new_for_file() for details.
|
||
**/
|
||
void
|
||
gtk_picture_set_file (GtkPicture *self,
|
||
GFile *file)
|
||
{
|
||
GdkPaintable *paintable;
|
||
|
||
g_return_if_fail (GTK_IS_PICTURE (self));
|
||
g_return_if_fail (file == NULL || G_IS_FILE (file));
|
||
|
||
if (self->file == file)
|
||
return;
|
||
|
||
g_object_freeze_notify (G_OBJECT (self));
|
||
|
||
g_set_object (&self->file, file);
|
||
g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_FILE]);
|
||
|
||
paintable = load_scalable_with_loader (file, gtk_widget_get_scale_factor (GTK_WIDGET (self)));
|
||
gtk_picture_set_paintable (self, paintable);
|
||
g_clear_object (&paintable);
|
||
|
||
g_object_thaw_notify (G_OBJECT (self));
|
||
}
|
||
|
||
/**
|
||
* gtk_picture_get_file:
|
||
* @self: a #GtkPicture
|
||
*
|
||
* Gets the #GFile currently displayed if @self is displaying a file.
|
||
* If @self is not displaying a file, for example when gtk_picture_set_paintable()
|
||
* was used, then %NULL is returned.
|
||
*
|
||
* Returns: (nullable) (transfer none): The #GFile displayed by @self.
|
||
**/
|
||
GFile *
|
||
gtk_picture_get_file (GtkPicture *self)
|
||
{
|
||
g_return_val_if_fail (GTK_IS_PICTURE (self), FALSE);
|
||
|
||
return self->file;
|
||
}
|
||
|
||
/**
|
||
* gtk_picture_set_filename:
|
||
* @self: a #GtkPicture
|
||
* @filename: (nullable): the filename to play
|
||
*
|
||
* Makes @self load and display the given @filename.
|
||
*
|
||
* This is a utility function that calls gtk_picture_set_file().
|
||
**/
|
||
void
|
||
gtk_picture_set_filename (GtkPicture *self,
|
||
const char *filename)
|
||
{
|
||
GFile *file;
|
||
|
||
g_return_if_fail (GTK_IS_PICTURE (self));
|
||
|
||
if (filename)
|
||
file = g_file_new_for_path (filename);
|
||
else
|
||
file = NULL;
|
||
|
||
gtk_picture_set_file (self, file);
|
||
|
||
if (file)
|
||
g_object_unref (file);
|
||
}
|
||
|
||
/**
|
||
* gtk_picture_set_resource:
|
||
* @self: a #GtkPicture
|
||
* @resource_path: (nullable): the resource to set
|
||
*
|
||
* Makes @self load and display the resource at the given
|
||
* @resource_path.
|
||
*
|
||
* This is a utility function that calls gtk_picture_set_file(),
|
||
**/
|
||
void
|
||
gtk_picture_set_resource (GtkPicture *self,
|
||
const char *resource_path)
|
||
{
|
||
GFile *file;
|
||
|
||
g_return_if_fail (GTK_IS_PICTURE (self));
|
||
|
||
if (resource_path)
|
||
{
|
||
char *uri, *escaped;
|
||
|
||
escaped = g_uri_escape_string (resource_path,
|
||
G_URI_RESERVED_CHARS_ALLOWED_IN_PATH, FALSE);
|
||
uri = g_strconcat ("resource://", escaped, NULL);
|
||
g_free (escaped);
|
||
|
||
file = g_file_new_for_uri (uri);
|
||
g_free (uri);
|
||
}
|
||
else
|
||
{
|
||
file = NULL;
|
||
}
|
||
|
||
gtk_picture_set_file (self, file);
|
||
|
||
if (file)
|
||
g_object_unref (file);
|
||
}
|
||
|
||
/**
|
||
* gtk_picture_set_pixbuf:
|
||
* @self: a #GtkPicture
|
||
* @pixbuf: (nullable): a #GdkPixbuf or %NULL
|
||
*
|
||
* See gtk_picture_new_for_pixbuf() for details.
|
||
*
|
||
* This is a utility function that calls gtk_picture_set_paintable(),
|
||
**/
|
||
void
|
||
gtk_picture_set_pixbuf (GtkPicture *self,
|
||
GdkPixbuf *pixbuf)
|
||
{
|
||
GdkTexture *texture;
|
||
|
||
g_return_if_fail (GTK_IS_PICTURE (self));
|
||
g_return_if_fail (pixbuf == NULL || GDK_IS_PIXBUF (pixbuf));
|
||
|
||
if (pixbuf)
|
||
texture = gdk_texture_new_for_pixbuf (pixbuf);
|
||
else
|
||
texture = NULL;
|
||
|
||
gtk_picture_set_paintable (self, GDK_PAINTABLE (texture));
|
||
|
||
if (texture)
|
||
g_object_unref (texture);
|
||
}
|
||
|
||
static void
|
||
gtk_picture_paintable_invalidate_contents (GdkPaintable *paintable,
|
||
GtkPicture *self)
|
||
{
|
||
gtk_widget_queue_draw (GTK_WIDGET (self));
|
||
}
|
||
|
||
static void
|
||
gtk_picture_paintable_invalidate_size (GdkPaintable *paintable,
|
||
GtkPicture *self)
|
||
{
|
||
gtk_widget_queue_resize (GTK_WIDGET (self));
|
||
}
|
||
|
||
/**
|
||
* gtk_picture_set_paintable:
|
||
* @self: a #GtkPicture
|
||
* @paintable: (nullable): a #GdkPaintable or %NULL
|
||
*
|
||
* Makes @self display the given @paintable. If @paintable is %NULL,
|
||
* nothing will be displayed.
|
||
*
|
||
* See gtk_picture_new_for_paintable() for details.
|
||
**/
|
||
void
|
||
gtk_picture_set_paintable (GtkPicture *self,
|
||
GdkPaintable *paintable)
|
||
{
|
||
g_return_if_fail (GTK_IS_PICTURE (self));
|
||
g_return_if_fail (paintable == NULL || GDK_IS_PAINTABLE (paintable));
|
||
|
||
if (self->paintable == paintable)
|
||
return;
|
||
|
||
g_object_freeze_notify (G_OBJECT (self));
|
||
|
||
if (paintable)
|
||
g_object_ref (paintable);
|
||
|
||
if (self->paintable)
|
||
{
|
||
const guint flags = gdk_paintable_get_flags (self->paintable);
|
||
|
||
if ((flags & GDK_PAINTABLE_STATIC_CONTENTS) == 0)
|
||
g_signal_handlers_disconnect_by_func (self->paintable,
|
||
gtk_picture_paintable_invalidate_contents,
|
||
self);
|
||
|
||
if ((flags & GDK_PAINTABLE_STATIC_SIZE) == 0)
|
||
g_signal_handlers_disconnect_by_func (self->paintable,
|
||
gtk_picture_paintable_invalidate_size,
|
||
self);
|
||
}
|
||
|
||
self->paintable = paintable;
|
||
|
||
if (paintable)
|
||
{
|
||
const guint flags = gdk_paintable_get_flags (paintable);
|
||
|
||
if ((flags & GDK_PAINTABLE_STATIC_CONTENTS) == 0)
|
||
g_signal_connect (paintable,
|
||
"invalidate-contents",
|
||
G_CALLBACK (gtk_picture_paintable_invalidate_contents),
|
||
self);
|
||
|
||
if ((flags & GDK_PAINTABLE_STATIC_SIZE) == 0)
|
||
g_signal_connect (paintable,
|
||
"invalidate-size",
|
||
G_CALLBACK (gtk_picture_paintable_invalidate_size),
|
||
self);
|
||
}
|
||
|
||
gtk_widget_queue_resize (GTK_WIDGET (self));
|
||
|
||
g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_PAINTABLE]);
|
||
|
||
g_object_thaw_notify (G_OBJECT (self));
|
||
}
|
||
|
||
/**
|
||
* gtk_picture_get_paintable:
|
||
* @self: a #GtkPicture
|
||
*
|
||
* Gets the #GdkPaintable being displayed by the #GtkPicture.
|
||
*
|
||
* Returns: (nullable) (transfer none): the displayed paintable, or %NULL if
|
||
* the picture is empty
|
||
**/
|
||
GdkPaintable *
|
||
gtk_picture_get_paintable (GtkPicture *self)
|
||
{
|
||
g_return_val_if_fail (GTK_IS_PICTURE (self), NULL);
|
||
|
||
return self->paintable;
|
||
}
|
||
|
||
/**
|
||
* gtk_picture_set_keep_aspect_ratio:
|
||
* @self: a #GtkPicture
|
||
* @keep_aspect_ratio: whether to keep aspect ratio
|
||
*
|
||
* If set to %TRUE, the @self will render its contents according to
|
||
* their aspect ratio. That means that empty space may show up at the
|
||
* top/bottom or left/right of @self.
|
||
*
|
||
* If set to %FALSE or if the contents provide no aspect ratio, the
|
||
* contents will be stretched over the picture's whole area.
|
||
*/
|
||
void
|
||
gtk_picture_set_keep_aspect_ratio (GtkPicture *self,
|
||
gboolean keep_aspect_ratio)
|
||
{
|
||
g_return_if_fail (GTK_IS_PICTURE (self));
|
||
|
||
if (self->keep_aspect_ratio == keep_aspect_ratio)
|
||
return;
|
||
|
||
self->keep_aspect_ratio = keep_aspect_ratio;
|
||
g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_KEEP_ASPECT_RATIO]);
|
||
}
|
||
|
||
/**
|
||
* gtk_picture_get_keep_aspect_ratio:
|
||
* @self: a #GtkPicture
|
||
*
|
||
* Gets the value set via gtk_picture_set_keep_aspect_ratio().
|
||
*
|
||
* Returns: %TRUE if the self tries to keep the contents' aspect ratio
|
||
**/
|
||
gboolean
|
||
gtk_picture_get_keep_aspect_ratio (GtkPicture *self)
|
||
{
|
||
g_return_val_if_fail (GTK_IS_PICTURE (self), TRUE);
|
||
|
||
return self->keep_aspect_ratio;
|
||
}
|
||
|
||
/**
|
||
* gtk_picture_set_can_shrink:
|
||
* @self: a #GtkPicture
|
||
* @can_shrink: if @self can be made smaller than its contents
|
||
*
|
||
* If set to %TRUE, the @self can be made smaller than its contents.
|
||
* The contents will then be scaled down when rendering.
|
||
*
|
||
* If you want to still force a minimum size manually, consider using
|
||
* gtk_widget_set_size_request().
|
||
*
|
||
* Also of note is that a similar function for growing does not exist
|
||
* because the grow behavior can be controlled via
|
||
* gtk_widget_set_halign() and gtk_widget_set_valign().
|
||
*/
|
||
void
|
||
gtk_picture_set_can_shrink (GtkPicture *self,
|
||
gboolean can_shrink)
|
||
{
|
||
g_return_if_fail (GTK_IS_PICTURE (self));
|
||
|
||
if (self->can_shrink == can_shrink)
|
||
return;
|
||
|
||
self->can_shrink = can_shrink;
|
||
g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_CAN_SHRINK]);
|
||
}
|
||
|
||
/**
|
||
* gtk_picture_get_can_shrink:
|
||
* @self: a #GtkPicture
|
||
*
|
||
* Gets the value set via gtk_picture_set_can_shrink().
|
||
*
|
||
* Returns: %TRUE if the picture can be made smaller than its contents
|
||
**/
|
||
gboolean
|
||
gtk_picture_get_can_shrink (GtkPicture *self)
|
||
{
|
||
g_return_val_if_fail (GTK_IS_PICTURE (self), FALSE);
|
||
|
||
return self->can_shrink;
|
||
}
|
||
|
||
/**
|
||
* gtk_picture_set_alternative_text:
|
||
* @self: a #GtkPicture
|
||
* @alternative_text: (nullable): a textual description of the contents
|
||
*
|
||
* Sets an alternative textual description for the picture contents.
|
||
* It is equivalent to the "alt" attribute for images on websites.
|
||
*
|
||
* This text will be made available to accessibility tools.
|
||
*
|
||
* If the picture cannot be described textually, set this property to %NULL.
|
||
*/
|
||
void
|
||
gtk_picture_set_alternative_text (GtkPicture *self,
|
||
const char *alternative_text)
|
||
{
|
||
g_return_if_fail (GTK_IS_PICTURE (self));
|
||
|
||
if (g_strcmp0 (self->alternative_text, alternative_text) == 0)
|
||
return;
|
||
|
||
g_free (self->alternative_text);
|
||
self->alternative_text = g_strdup (alternative_text);
|
||
g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_ALTERNATIVE_TEXT]);
|
||
}
|
||
|
||
/**
|
||
* gtk_picture_get_alternative_text:
|
||
* @self: a #GtkPicture
|
||
*
|
||
* Gets the alternative textual description of the picture or returns %NULL if
|
||
* the picture cannot be described textually.
|
||
*
|
||
* Returns: (nullable) (transfer none): the alternative textual description
|
||
* of @self.
|
||
**/
|
||
const char *
|
||
gtk_picture_get_alternative_text (GtkPicture *self)
|
||
{
|
||
g_return_val_if_fail (GTK_IS_PICTURE (self), NULL);
|
||
|
||
return self->alternative_text;
|
||
}
|
||
|