gtk2/gtk/gtkiconhelper.c

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/* GTK - The GIMP Toolkit
* Copyright (C) 2011 Red Hat, Inc.
*
* Authors: Cosimo Cecchi <cosimoc@gnome.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "gtkiconhelperprivate.h"
#include <math.h>
#include "gtkcssenumvalueprivate.h"
#include "gtkcssiconthemevalueprivate.h"
#include "gtkcssnodeprivate.h"
#include "gtkcssnumbervalueprivate.h"
#include "gtkcssstyleprivate.h"
#include "gtkcssstylepropertyprivate.h"
#include "gtkcsstransientnodeprivate.h"
#include "gtkiconthemeprivate.h"
#include "gtkrendericonprivate.h"
#include "gtkscalerprivate.h"
#include "gtksnapshot.h"
#include "gtkwidgetprivate.h"
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struct _GtkIconHelper
{
GObject parent_instance;
GtkImageDefinition *def;
gint pixel_size;
guint use_fallback : 1;
guint force_scale_pixbuf : 1;
guint texture_is_symbolic : 1;
GtkWidget *owner;
GtkCssNode *node;
GdkPaintable *paintable;
};
static GtkIconLookupFlags
get_icon_lookup_flags (GtkIconHelper *self,
GtkCssStyle *style,
GtkTextDirection dir)
{
GtkIconLookupFlags flags;
GtkCssIconStyle icon_style;
flags = GTK_ICON_LOOKUP_USE_BUILTIN;
if (self->pixel_size != -1 || self->force_scale_pixbuf)
flags |= GTK_ICON_LOOKUP_FORCE_SIZE;
icon_style = _gtk_css_icon_style_value_get (gtk_css_style_get_value (style, GTK_CSS_PROPERTY_ICON_STYLE));
switch (icon_style)
{
case GTK_CSS_ICON_STYLE_REGULAR:
flags |= GTK_ICON_LOOKUP_FORCE_REGULAR;
break;
case GTK_CSS_ICON_STYLE_SYMBOLIC:
flags |= GTK_ICON_LOOKUP_FORCE_SYMBOLIC;
break;
case GTK_CSS_ICON_STYLE_REQUESTED:
break;
default:
g_assert_not_reached ();
return 0;
}
if (dir == GTK_TEXT_DIR_LTR)
flags |= GTK_ICON_LOOKUP_DIR_LTR;
else if (dir == GTK_TEXT_DIR_RTL)
flags |= GTK_ICON_LOOKUP_DIR_RTL;
return flags;
}
static GdkPaintable *
ensure_paintable_for_gicon (GtkIconHelper *self,
GtkCssStyle *style,
GtkTextDirection dir,
gint scale,
GIcon *gicon,
gboolean *symbolic)
{
GtkIconTheme *icon_theme;
gint width, height;
GtkIconInfo *info;
GtkIconLookupFlags flags;
GdkPaintable *paintable;
icon_theme = gtk_css_icon_theme_value_get_icon_theme
(gtk_css_style_get_value (style, GTK_CSS_PROPERTY_ICON_THEME));
flags = get_icon_lookup_flags (self, style, dir);
width = height = gtk_icon_helper_get_size (self);
info = gtk_icon_theme_lookup_by_gicon_for_scale (icon_theme,
gicon,
MIN (width, height),
scale, flags);
if (info == NULL)
info = gtk_icon_theme_lookup_icon (icon_theme,
"image-missing",
width,
flags | GTK_ICON_LOOKUP_USE_BUILTIN | GTK_ICON_LOOKUP_GENERIC_FALLBACK);
*symbolic = gtk_icon_info_is_symbolic (info);
paintable = GDK_PAINTABLE (gtk_icon_info_load_texture (info));
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g_object_unref (info);
if (paintable && scale != 1)
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{
GdkPaintable *orig = paintable;
paintable = gtk_scaler_new (orig, scale);
g_object_unref (orig);
}
return paintable;
}
static GdkPaintable *
gtk_icon_helper_load_paintable (GtkIconHelper *self,
gboolean *out_symbolic)
{
GdkPaintable *paintable;
GIcon *gicon;
gboolean symbolic;
switch (gtk_image_definition_get_storage_type (self->def))
{
case GTK_IMAGE_PAINTABLE:
paintable = g_object_ref (gtk_image_definition_get_paintable (self->def));
symbolic = FALSE;
break;
case GTK_IMAGE_ICON_NAME:
if (self->use_fallback)
gicon = g_themed_icon_new_with_default_fallbacks (gtk_image_definition_get_icon_name (self->def));
else
gicon = g_themed_icon_new (gtk_image_definition_get_icon_name (self->def));
paintable = ensure_paintable_for_gicon (self,
gtk_css_node_get_style (self->node),
gtk_widget_get_direction (self->owner),
gtk_widget_get_scale_factor (self->owner),
gicon,
&symbolic);
g_object_unref (gicon);
break;
case GTK_IMAGE_GICON:
paintable = ensure_paintable_for_gicon (self,
gtk_css_node_get_style (self->node),
gtk_widget_get_direction (self->owner),
gtk_widget_get_scale_factor (self->owner),
gtk_image_definition_get_gicon (self->def),
&symbolic);
break;
case GTK_IMAGE_EMPTY:
default:
paintable = NULL;
symbolic = FALSE;
break;
}
*out_symbolic = symbolic;
return paintable;
}
static void
gtk_icon_helper_ensure_paintable (GtkIconHelper *self)
{
gboolean symbolic;
if (self->paintable)
return;
self->paintable = gtk_icon_helper_load_paintable (self, &symbolic);
self->texture_is_symbolic = symbolic;
}
static void
gtk_icon_helper_paintable_snapshot (GdkPaintable *paintable,
GdkSnapshot *snapshot,
double width,
double height)
{
GtkIconHelper *self = GTK_ICON_HELPER (paintable);
GtkCssStyle *style;
style = gtk_css_node_get_style (self->node);
gtk_icon_helper_ensure_paintable (self);
if (self->paintable == NULL)
return;
switch (gtk_image_definition_get_storage_type (self->def))
{
case GTK_IMAGE_ICON_NAME:
case GTK_IMAGE_GICON:
{
double x, y, w, h;
/* Never scale up icons. */
w = gdk_paintable_get_intrinsic_width (self->paintable);
h = gdk_paintable_get_intrinsic_height (self->paintable);
w = MIN (w, width);
h = MIN (h, height);
x = (width - w) / 2;
y = (height - h) / 2;
gtk_snapshot_offset (snapshot, x, y);
gtk_css_style_snapshot_icon_paintable (style,
snapshot,
self->paintable,
w, h,
self->texture_is_symbolic);
gtk_snapshot_offset (snapshot, -x, -y);
}
break;
case GTK_IMAGE_PAINTABLE:
case GTK_IMAGE_EMPTY:
default:
{
double image_ratio = (double) width / height;
double ratio;
double x, y, w, h;
if (self->paintable == NULL)
break;
ratio = gdk_paintable_get_intrinsic_aspect_ratio (self->paintable);
if (ratio == 0)
{
w = width;
h = height;
}
else if (ratio > image_ratio)
{
w = width;
h = width / ratio;
}
else
{
w = height * ratio;
h = height;
}
x = floor (width - ceil (w)) / 2;
y = floor (height - ceil (h)) / 2;
gtk_snapshot_offset (snapshot, x, y);
gtk_css_style_snapshot_icon_paintable (style,
snapshot,
self->paintable,
w, h,
self->texture_is_symbolic);
gtk_snapshot_offset (snapshot, -x, -y);
}
break;
}
}
static GdkPaintable *
gtk_icon_helper_paintable_get_current_image (GdkPaintable *paintable)
{
GtkIconHelper *self = GTK_ICON_HELPER (paintable);
gtk_icon_helper_ensure_paintable (self);
if (self->paintable == NULL)
return NULL;
return gtk_icon_helper_paintable_get_current_image (self->paintable);
}
static int
gtk_icon_helper_paintable_get_intrinsic_width (GdkPaintable *paintable)
{
GtkIconHelper *self = GTK_ICON_HELPER (paintable);
return gtk_icon_helper_get_size (self);
}
static int
gtk_icon_helper_paintable_get_intrinsic_height (GdkPaintable *paintable)
{
GtkIconHelper *self = GTK_ICON_HELPER (paintable);
return gtk_icon_helper_get_size (self);
}
static double gtk_icon_helper_paintable_get_intrinsic_aspect_ratio (GdkPaintable *paintable)
{
return 1.0;
};
static void
gtk_icon_helper_paintable_init (GdkPaintableInterface *iface)
{
iface->snapshot = gtk_icon_helper_paintable_snapshot;
iface->get_current_image = gtk_icon_helper_paintable_get_current_image;
iface->get_intrinsic_width = gtk_icon_helper_paintable_get_intrinsic_width;
iface->get_intrinsic_height = gtk_icon_helper_paintable_get_intrinsic_height;
iface->get_intrinsic_aspect_ratio = gtk_icon_helper_paintable_get_intrinsic_aspect_ratio;
}
G_DEFINE_TYPE_WITH_CODE (GtkIconHelper, gtk_icon_helper, G_TYPE_OBJECT,
G_IMPLEMENT_INTERFACE (GDK_TYPE_PAINTABLE,
gtk_icon_helper_paintable_init))
void
gtk_icon_helper_invalidate (GtkIconHelper *self)
{
g_clear_object (&self->paintable);
self->texture_is_symbolic = FALSE;
if (!GTK_IS_CSS_TRANSIENT_NODE (self->node))
gtk_widget_queue_resize (self->owner);
}
void
gtk_icon_helper_invalidate_for_change (GtkIconHelper *self,
GtkCssStyleChange *change)
{
if (change == NULL ||
((gtk_css_style_change_affects (change, GTK_CSS_AFFECTS_SYMBOLIC_ICON) &&
self->texture_is_symbolic) ||
(gtk_css_style_change_affects (change, GTK_CSS_AFFECTS_ICON) &&
!self->texture_is_symbolic)))
{
/* Avoid the queue_resize in gtk_icon_helper_invalidate */
g_clear_object (&self->paintable);
self->texture_is_symbolic = FALSE;
if (change == NULL ||
(gtk_css_style_change_affects (change, GTK_CSS_AFFECTS_ICON_SIZE) &&
!GTK_IS_CSS_TRANSIENT_NODE (self->node)))
gtk_widget_queue_resize (self->owner);
}
}
static void
gtk_icon_helper_take_definition (GtkIconHelper *self,
GtkImageDefinition *def)
{
_gtk_icon_helper_clear (self);
if (def == NULL)
return;
gtk_image_definition_unref (self->def);
self->def = def;
gtk_icon_helper_invalidate (self);
}
void
_gtk_icon_helper_clear (GtkIconHelper *self)
{
g_clear_object (&self->paintable);
self->texture_is_symbolic = FALSE;
if (gtk_image_definition_get_storage_type (self->def) != GTK_IMAGE_EMPTY)
{
gtk_image_definition_unref (self->def);
self->def = gtk_image_definition_new_empty ();
gtk_icon_helper_invalidate (self);
}
}
static void
gtk_icon_helper_finalize (GObject *object)
{
GtkIconHelper *self = GTK_ICON_HELPER (object);
_gtk_icon_helper_clear (self);
g_signal_handlers_disconnect_by_func (self->owner, G_CALLBACK (gtk_icon_helper_invalidate), self);
gtk_image_definition_unref (self->def);
G_OBJECT_CLASS (gtk_icon_helper_parent_class)->finalize (object);
}
void
gtk_icon_helper_class_init (GtkIconHelperClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
gobject_class->finalize = gtk_icon_helper_finalize;
}
void
gtk_icon_helper_init (GtkIconHelper *self)
{
self->def = gtk_image_definition_new_empty ();
}
GtkIconHelper *
gtk_icon_helper_new (GtkCssNode *css_node,
GtkWidget *owner)
{
GtkIconHelper *self;
self = g_object_new (GTK_TYPE_ICON_HELPER, NULL);
self->pixel_size = -1;
self->texture_is_symbolic = FALSE;
self->node = css_node;
self->owner = owner;
g_signal_connect_swapped (owner, "direction-changed", G_CALLBACK (gtk_icon_helper_invalidate), self);
g_signal_connect_swapped (owner, "notify::scale-factor", G_CALLBACK (gtk_icon_helper_invalidate), self);
return self;
}
int
gtk_icon_helper_get_size (GtkIconHelper *self)
{
GtkCssStyle *style;
if (self->pixel_size != -1)
return self->pixel_size;
style = gtk_css_node_get_style (self->node);
return _gtk_css_number_value_get (gtk_css_style_get_value (style, GTK_CSS_PROPERTY_ICON_SIZE), 100);
}
void
_gtk_icon_helper_set_definition (GtkIconHelper *self,
GtkImageDefinition *def)
{
if (def)
gtk_icon_helper_take_definition (self, gtk_image_definition_ref (def));
else
_gtk_icon_helper_clear (self);
}
void
_gtk_icon_helper_set_gicon (GtkIconHelper *self,
GIcon *gicon)
{
gtk_icon_helper_take_definition (self, gtk_image_definition_new_gicon (gicon));
}
void
_gtk_icon_helper_set_icon_name (GtkIconHelper *self,
const gchar *icon_name)
{
gtk_icon_helper_take_definition (self, gtk_image_definition_new_icon_name (icon_name));
}
void
_gtk_icon_helper_set_paintable (GtkIconHelper *self,
GdkPaintable *paintable)
{
gtk_icon_helper_take_definition (self, gtk_image_definition_new_paintable (paintable));
}
gboolean
_gtk_icon_helper_set_pixel_size (GtkIconHelper *self,
gint pixel_size)
{
if (self->pixel_size != pixel_size)
{
self->pixel_size = pixel_size;
gtk_icon_helper_invalidate (self);
return TRUE;
}
return FALSE;
}
gboolean
_gtk_icon_helper_set_use_fallback (GtkIconHelper *self,
gboolean use_fallback)
{
if (self->use_fallback != use_fallback)
{
self->use_fallback = use_fallback;
gtk_icon_helper_invalidate (self);
return TRUE;
}
return FALSE;
}
GtkImageType
_gtk_icon_helper_get_storage_type (GtkIconHelper *self)
{
return gtk_image_definition_get_storage_type (self->def);
}
gboolean
_gtk_icon_helper_get_use_fallback (GtkIconHelper *self)
{
return self->use_fallback;
}
gint
_gtk_icon_helper_get_pixel_size (GtkIconHelper *self)
{
return self->pixel_size;
}
GtkImageDefinition *
gtk_icon_helper_get_definition (GtkIconHelper *self)
{
return self->def;
}
GIcon *
_gtk_icon_helper_peek_gicon (GtkIconHelper *self)
{
return gtk_image_definition_get_gicon (self->def);
}
GdkPaintable *
_gtk_icon_helper_peek_paintable (GtkIconHelper *self)
{
return gtk_image_definition_get_paintable (self->def);
}
const gchar *
_gtk_icon_helper_get_icon_name (GtkIconHelper *self)
{
return gtk_image_definition_get_icon_name (self->def);
}
gboolean
_gtk_icon_helper_get_is_empty (GtkIconHelper *self)
{
return gtk_image_definition_get_storage_type (self->def) == GTK_IMAGE_EMPTY;
}
gboolean
_gtk_icon_helper_get_force_scale_pixbuf (GtkIconHelper *self)
{
return self->force_scale_pixbuf;
}
void
_gtk_icon_helper_set_force_scale_pixbuf (GtkIconHelper *self,
gboolean force_scale)
{
if (self->force_scale_pixbuf != force_scale)
{
self->force_scale_pixbuf = force_scale;
gtk_icon_helper_invalidate (self);
}
}
void
gtk_icon_size_set_style_classes (GtkCssNode *cssnode,
GtkIconSize icon_size)
{
struct {
GtkIconSize icon_size;
const char *class_name;
} class_names[] = {
{ GTK_ICON_SIZE_NORMAL, "normal-icons" },
{ GTK_ICON_SIZE_LARGE, "large-icons" }
};
guint i;
for (i = 0; i < G_N_ELEMENTS (class_names); i++)
{
if (icon_size == class_names[i].icon_size)
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gtk_css_node_add_class (cssnode, g_quark_from_static_string (class_names[i].class_name));
else
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gtk_css_node_remove_class (cssnode, g_quark_from_static_string (class_names[i].class_name));
}
}