gtk2/gtk/gtkmagnifier.c
Timm Bäder 600952e295 magnifier: Don't try to use a null widget paintable
We destroy the paintable in dispose, which can be called multiple times.
2020-03-24 10:44:06 +01:00

357 lines
11 KiB
C

/* GTK - The GIMP Toolkit
* Copyright © 2013 Carlos Garnacho <carlosg@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
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "gtk/gtk.h"
#include "gtkmagnifierprivate.h"
#include "gtkwidgetprivate.h"
#include "gtksnapshot.h"
#include "gtkintl.h"
enum {
PROP_INSPECTED = 1,
PROP_RESIZE,
PROP_MAGNIFICATION
};
typedef struct _GtkMagnifierPrivate GtkMagnifierPrivate;
struct _GtkMagnifierPrivate
{
GdkPaintable *paintable;
gdouble magnification;
gint x;
gint y;
gboolean resize;
};
G_DEFINE_TYPE_WITH_PRIVATE (GtkMagnifier, gtk_magnifier,
GTK_TYPE_WIDGET)
static void
_gtk_magnifier_set_property (GObject *object,
guint param_id,
const GValue *value,
GParamSpec *pspec)
{
switch (param_id)
{
case PROP_INSPECTED:
_gtk_magnifier_set_inspected (GTK_MAGNIFIER (object),
g_value_get_object (value));
break;
case PROP_MAGNIFICATION:
_gtk_magnifier_set_magnification (GTK_MAGNIFIER (object),
g_value_get_double (value));
break;
case PROP_RESIZE:
_gtk_magnifier_set_resize (GTK_MAGNIFIER (object),
g_value_get_boolean (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
}
}
static void
_gtk_magnifier_get_property (GObject *object,
guint param_id,
GValue *value,
GParamSpec *pspec)
{
GtkMagnifier *magnifier;
GtkMagnifierPrivate *priv;
magnifier = GTK_MAGNIFIER (object);
priv = gtk_magnifier_get_instance_private (magnifier);
switch (param_id)
{
case PROP_INSPECTED:
g_value_set_object (value, gtk_widget_paintable_get_widget (GTK_WIDGET_PAINTABLE (priv->paintable)));
break;
case PROP_MAGNIFICATION:
g_value_set_double (value, priv->magnification);
break;
case PROP_RESIZE:
g_value_set_boolean (value, priv->resize);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
}
}
static void
gtk_magnifier_snapshot (GtkWidget *widget,
GtkSnapshot *snapshot)
{
GtkMagnifier *magnifier = GTK_MAGNIFIER (widget);
GtkMagnifierPrivate *priv = gtk_magnifier_get_instance_private (magnifier);
double width, height, paintable_width, paintable_height;
if (gtk_widget_paintable_get_widget (GTK_WIDGET_PAINTABLE (priv->paintable)) == NULL)
return;
width = gtk_widget_get_width (widget);
height = gtk_widget_get_height (widget);
paintable_width = gdk_paintable_get_intrinsic_width (priv->paintable);
paintable_height = gdk_paintable_get_intrinsic_height (priv->paintable);
if (paintable_width <= 0.0 || paintable_height <= 0.0)
return;
gtk_snapshot_save (snapshot);
if (!priv->resize)
gtk_snapshot_translate (snapshot, &GRAPHENE_POINT_INIT (width / 2, height / 2));
gtk_snapshot_scale (snapshot, priv->magnification, priv->magnification);
gtk_snapshot_translate (snapshot, &GRAPHENE_POINT_INIT (
- CLAMP (priv->x, 0, paintable_width),
- CLAMP (priv->y, 0, paintable_height)));
gdk_paintable_snapshot (priv->paintable, snapshot, paintable_width, paintable_height);
gtk_snapshot_restore (snapshot);
}
static void
gtk_magnifier_measure (GtkWidget *widget,
GtkOrientation orientation,
int for_size,
int *minimum,
int *natural,
int *minimum_baseline,
int *natural_baseline)
{
GtkMagnifier *magnifier = GTK_MAGNIFIER (widget);
GtkMagnifierPrivate *priv = gtk_magnifier_get_instance_private (magnifier);
gint size;
if (priv->resize)
{
if (orientation == GTK_ORIENTATION_HORIZONTAL)
size = priv->magnification * gdk_paintable_get_intrinsic_width (priv->paintable);
else
size = priv->magnification * gdk_paintable_get_intrinsic_height (priv->paintable);
}
else
size = 0;
*minimum = size;
*natural = size;
}
static void
gtk_magnifier_dispose (GObject *object)
{
GtkMagnifier *self = GTK_MAGNIFIER (object);
GtkMagnifierPrivate *priv = gtk_magnifier_get_instance_private (self);
if (priv->paintable)
_gtk_magnifier_set_inspected (self, NULL);
g_clear_object (&priv->paintable);
G_OBJECT_CLASS (gtk_magnifier_parent_class)->dispose (object);
}
static void
gtk_magnifier_class_init (GtkMagnifierClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
object_class->set_property = _gtk_magnifier_set_property;
object_class->get_property = _gtk_magnifier_get_property;
object_class->dispose = gtk_magnifier_dispose;
widget_class->snapshot = gtk_magnifier_snapshot;
widget_class->measure = gtk_magnifier_measure;
g_object_class_install_property (object_class,
PROP_INSPECTED,
g_param_spec_object ("inspected",
P_("Inspected"),
P_("Inspected widget"),
GTK_TYPE_WIDGET,
G_PARAM_READWRITE));
g_object_class_install_property (object_class,
PROP_MAGNIFICATION,
g_param_spec_double ("magnification",
P_("magnification"),
P_("magnification"),
1, G_MAXDOUBLE, 1,
G_PARAM_READWRITE));
g_object_class_install_property (object_class,
PROP_RESIZE,
g_param_spec_boolean ("resize",
P_("resize"),
P_("resize"),
FALSE,
G_PARAM_READWRITE));
}
static void
gtk_magnifier_init (GtkMagnifier *self)
{
GtkMagnifierPrivate *priv = gtk_magnifier_get_instance_private (self);
GtkWidget *widget = GTK_WIDGET (self);
gtk_widget_set_overflow (widget, GTK_OVERFLOW_HIDDEN);
priv->magnification = 1;
priv->resize = FALSE;
priv->paintable = gtk_widget_paintable_new (NULL);
g_signal_connect_swapped (priv->paintable, "invalidate-contents", G_CALLBACK (gtk_widget_queue_draw), self);
g_signal_connect_swapped (priv->paintable, "invalidate-size", G_CALLBACK (gtk_widget_queue_resize), self);
}
GtkWidget *
_gtk_magnifier_new (GtkWidget *inspected)
{
g_return_val_if_fail (GTK_IS_WIDGET (inspected), NULL);
return g_object_new (GTK_TYPE_MAGNIFIER,
"inspected", inspected,
NULL);
}
GtkWidget *
_gtk_magnifier_get_inspected (GtkMagnifier *magnifier)
{
GtkMagnifierPrivate *priv = gtk_magnifier_get_instance_private (magnifier);
g_return_val_if_fail (GTK_IS_MAGNIFIER (magnifier), NULL);
return gtk_widget_paintable_get_widget (GTK_WIDGET_PAINTABLE (priv->paintable));
}
void
_gtk_magnifier_set_inspected (GtkMagnifier *magnifier,
GtkWidget *inspected)
{
GtkMagnifierPrivate *priv = gtk_magnifier_get_instance_private (magnifier);
g_return_if_fail (GTK_IS_MAGNIFIER (magnifier));
g_return_if_fail (inspected == NULL || GTK_IS_WIDGET (inspected));
gtk_widget_paintable_set_widget (GTK_WIDGET_PAINTABLE (priv->paintable), inspected);
g_object_notify (G_OBJECT (magnifier), "inspected");
}
void
_gtk_magnifier_set_coords (GtkMagnifier *magnifier,
gdouble x,
gdouble y)
{
GtkMagnifierPrivate *priv;
g_return_if_fail (GTK_IS_MAGNIFIER (magnifier));
priv = gtk_magnifier_get_instance_private (magnifier);
if (priv->x == x && priv->y == y)
return;
priv->x = x;
priv->y = y;
if (gtk_widget_is_visible (GTK_WIDGET (magnifier)))
gtk_widget_queue_draw (GTK_WIDGET (magnifier));
}
void
_gtk_magnifier_get_coords (GtkMagnifier *magnifier,
gdouble *x,
gdouble *y)
{
GtkMagnifierPrivate *priv;
g_return_if_fail (GTK_IS_MAGNIFIER (magnifier));
priv = gtk_magnifier_get_instance_private (magnifier);
if (x)
*x = priv->x;
if (y)
*y = priv->y;
}
void
_gtk_magnifier_set_magnification (GtkMagnifier *magnifier,
gdouble magnification)
{
GtkMagnifierPrivate *priv;
g_return_if_fail (GTK_IS_MAGNIFIER (magnifier));
priv = gtk_magnifier_get_instance_private (magnifier);
if (priv->magnification == magnification)
return;
priv->magnification = magnification;
g_object_notify (G_OBJECT (magnifier), "magnification");
if (priv->resize)
gtk_widget_queue_resize (GTK_WIDGET (magnifier));
if (gtk_widget_is_visible (GTK_WIDGET (magnifier)))
gtk_widget_queue_draw (GTK_WIDGET (magnifier));
}
gdouble
_gtk_magnifier_get_magnification (GtkMagnifier *magnifier)
{
GtkMagnifierPrivate *priv;
g_return_val_if_fail (GTK_IS_MAGNIFIER (magnifier), 1);
priv = gtk_magnifier_get_instance_private (magnifier);
return priv->magnification;
}
void
_gtk_magnifier_set_resize (GtkMagnifier *magnifier,
gboolean resize)
{
GtkMagnifierPrivate *priv;
g_return_if_fail (GTK_IS_MAGNIFIER (magnifier));
priv = gtk_magnifier_get_instance_private (magnifier);
if (priv->resize == resize)
return;
priv->resize = resize;
gtk_widget_queue_resize (GTK_WIDGET (magnifier));
}
gboolean
_gtk_magnifier_get_resize (GtkMagnifier *magnifier)
{
GtkMagnifierPrivate *priv;
g_return_val_if_fail (GTK_IS_MAGNIFIER (magnifier), FALSE);
priv = gtk_magnifier_get_instance_private (magnifier);
return priv->resize;
}