gtk2/gtk/gtkmagnifier.c

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/* 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
{
GtkWidget *inspected;
gdouble magnification;
gint x;
gint y;
gboolean resize;
gulong draw_handler;
gulong resize_handler;
};
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, priv->inspected);
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);
GtkSnapshot *inspected_snapshot;
GskRenderNode *inspected_node;
graphene_matrix_t transform;
if (priv->inspected == NULL)
return;
if (!gtk_widget_is_visible (priv->inspected))
return;
g_signal_handler_block (priv->inspected, priv->draw_handler);
inspected_snapshot = gtk_snapshot_new (gtk_snapshot_get_record_names (snapshot),
NULL,
"MagnifierSnapshot");
gtk_widget_snapshot (priv->inspected, inspected_snapshot);
inspected_node = gtk_snapshot_free_to_node (inspected_snapshot);
if (inspected_node != NULL)
{
gtk_snapshot_push_clip (snapshot,
&GRAPHENE_RECT_INIT (0, 0,
gtk_widget_get_width (widget),
gtk_widget_get_height (widget)),
"MagnifierClip");
graphene_matrix_init_identity (&transform);
graphene_matrix_scale (&transform, priv->magnification, priv->magnification, 1);
gtk_snapshot_push_transform (snapshot, &transform, "Magnifier transform");
gtk_snapshot_append_node (snapshot, inspected_node);
gtk_snapshot_pop (snapshot);
gtk_snapshot_pop (snapshot);
}
g_signal_handler_unblock (priv->inspected, priv->draw_handler);
}
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 && priv->inspected)
{
if (orientation == GTK_ORIENTATION_HORIZONTAL)
size = priv->magnification * gtk_widget_get_allocated_width (priv->inspected);
else
size = priv->magnification * gtk_widget_get_allocated_height (priv->inspected);
}
else
size = 0;
*minimum = size;
*natural = size;
}
static void
resize_handler (GtkWidget *widget,
GtkAllocation *alloc,
int baseline,
GtkAllocation *out_clip,
GtkWidget *magnifier)
{
gtk_widget_queue_resize (magnifier);
}
static void
connect_resize_handler (GtkMagnifier *magnifier)
{
GtkMagnifierPrivate *priv;
priv = _gtk_magnifier_get_instance_private (magnifier);
if (priv->inspected && priv->resize)
priv->resize_handler = g_signal_connect (priv->inspected, "size-allocate",
G_CALLBACK (resize_handler), magnifier);
}
static void
disconnect_resize_handler (GtkMagnifier *magnifier)
{
GtkMagnifierPrivate *priv;
priv = _gtk_magnifier_get_instance_private (magnifier);
if (priv->resize_handler)
{
if (priv->inspected)
g_signal_handler_disconnect (priv->inspected, priv->resize_handler);
priv->resize_handler = 0;
}
}
static gboolean
draw_handler (GtkWidget *widget,
cairo_t *cr,
GtkWidget *magnifier)
{
gtk_widget_queue_draw (magnifier);
return FALSE;
}
static void
connect_draw_handler (GtkMagnifier *magnifier)
{
GtkMagnifierPrivate *priv;
priv = _gtk_magnifier_get_instance_private (magnifier);
if (!priv->draw_handler)
{
if (priv->inspected)
priv->draw_handler = g_signal_connect (priv->inspected, "draw",
G_CALLBACK (draw_handler), magnifier);
}
}
static void
disconnect_draw_handler (GtkMagnifier *magnifier)
{
GtkMagnifierPrivate *priv;
priv = _gtk_magnifier_get_instance_private (magnifier);
if (priv->draw_handler)
{
if (priv->inspected)
g_signal_handler_disconnect (priv->inspected, priv->draw_handler);
priv->draw_handler = 0;
}
}
static void
_gtk_magnifier_destroy (GtkWidget *widget)
{
_gtk_magnifier_set_inspected (GTK_MAGNIFIER (widget), NULL);
GTK_WIDGET_CLASS (_gtk_magnifier_parent_class)->destroy (widget);
}
static void
gtk_magnifier_map (GtkWidget *widget)
{
connect_draw_handler (GTK_MAGNIFIER (widget));
GTK_WIDGET_CLASS (_gtk_magnifier_parent_class)->map (widget);
}
static void
gtk_magnifier_unmap (GtkWidget *widget)
{
GTK_WIDGET_CLASS (_gtk_magnifier_parent_class)->unmap (widget);
disconnect_draw_handler (GTK_MAGNIFIER (widget));
}
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;
widget_class->destroy = _gtk_magnifier_destroy;
widget_class->snapshot = gtk_magnifier_snapshot;
widget_class->measure = gtk_magnifier_measure;
widget_class->map = gtk_magnifier_map;
widget_class->unmap = gtk_magnifier_unmap;
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 *magnifier)
{
GtkWidget *widget = GTK_WIDGET (magnifier);
GtkMagnifierPrivate *priv;
priv = _gtk_magnifier_get_instance_private (magnifier);
gtk_widget_set_has_surface (widget, FALSE);
priv->magnification = 1;
priv->resize = FALSE;
}
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;
g_return_val_if_fail (GTK_IS_MAGNIFIER (magnifier), NULL);
priv = _gtk_magnifier_get_instance_private (magnifier);
return priv->inspected;
}
void
_gtk_magnifier_set_inspected (GtkMagnifier *magnifier,
GtkWidget *inspected)
{
GtkMagnifierPrivate *priv;
2014-01-22 19:48:51 +00:00
g_return_if_fail (GTK_IS_MAGNIFIER (magnifier));
priv = _gtk_magnifier_get_instance_private (magnifier);
if (priv->inspected == inspected)
return;
disconnect_draw_handler (magnifier);
disconnect_resize_handler (magnifier);
if (priv->inspected)
g_object_remove_weak_pointer (G_OBJECT (priv->inspected),
(gpointer *) &priv->inspected);
priv->inspected = inspected;
if (priv->inspected)
g_object_add_weak_pointer (G_OBJECT (priv->inspected),
(gpointer *) &priv->inspected);
if (gtk_widget_get_mapped (GTK_WIDGET (magnifier)))
connect_draw_handler (magnifier);
connect_resize_handler (magnifier);
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));
if (resize)
connect_resize_handler (magnifier);
else
disconnect_resize_handler (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;
}