gtk2/gtk/gtkmagnifier.c
2014-02-07 10:01:49 +01:00

270 lines
7.4 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 "gtkintl.h"
enum {
PROP_INSPECTED = 1,
PROP_MAGNIFICATION
};
typedef struct _GtkMagnifierPrivate GtkMagnifierPrivate;
struct _GtkMagnifierPrivate
{
GtkWidget *inspected;
gdouble magnification;
gint x;
gint y;
};
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;
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;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
}
}
static gboolean
_gtk_magnifier_draw (GtkWidget *widget,
cairo_t *cr)
{
GtkAllocation allocation, inspected_alloc;
GtkMagnifier *magnifier;
GtkMagnifierPrivate *priv;
gdouble x, y;
magnifier = GTK_MAGNIFIER (widget);
priv = _gtk_magnifier_get_instance_private (magnifier);
if (!gtk_widget_is_visible (priv->inspected))
return FALSE;
gtk_widget_get_allocation (widget, &allocation);
gtk_widget_get_allocation (priv->inspected, &inspected_alloc);
cairo_translate (cr, allocation.width / 2, allocation.height / 2);
x = CLAMP (priv->x, 0, inspected_alloc.width);
y = CLAMP (priv->y, 0, inspected_alloc.height);
cairo_save (cr);
cairo_scale (cr, priv->magnification, priv->magnification);
cairo_translate (cr, -x, -y);
gtk_widget_draw (priv->inspected, cr);
cairo_restore (cr);
return TRUE;
}
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->draw = _gtk_magnifier_draw;
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));
}
static void
_gtk_magnifier_init (GtkMagnifier *magnifier)
{
GtkWidget *widget = GTK_WIDGET (magnifier);
GtkMagnifierPrivate *priv;
priv = _gtk_magnifier_get_instance_private (magnifier);
gtk_widget_set_events (widget,
gtk_widget_get_events (widget) |
GDK_EXPOSURE_MASK);
gtk_widget_set_has_window (widget, FALSE);
priv->magnification = 1;
}
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;
g_return_if_fail (GTK_IS_MAGNIFIER (magnifier));
priv = _gtk_magnifier_get_instance_private (magnifier);
if (priv->inspected == inspected)
return;
priv->inspected = 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 (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;
}