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Add GtkGesturePan

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This gesture reports events on horizontal/vertical panning gestures.
This commit is contained in:
Carlos Garnacho 2014-04-08 21:21:56 +02:00
parent 75b6f4aa52
commit c7da5b54f5
5 changed files with 366 additions and 0 deletions
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2
gtk/Makefile.am
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@ -284,6 +284,7 @@ gtk_public_h_sources = \
gtkgesturedrag.h \
gtkgesturelongpress.h \
gtkgesturemultipress.h \
gtkgesturepan.h \
gtkgesturerotate.h \
gtkgesturesingle.h \
gtkgestureswipe.h \
@ -785,6 +786,7 @@ gtk_base_c_sources = \
gtkgesturedrag.c \
gtkgesturelongpress.c \
gtkgesturemultipress.c \
gtkgesturepan.c \
gtkgesturerotate.c \
gtkgesturesingle.c \
gtkgestureswipe.c \

1
gtk/gtk.h
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@ -110,6 +110,7 @@
#include <gtk/gtkgesturedrag.h>
#include <gtk/gtkgesturelongpress.h>
#include <gtk/gtkgesturemultipress.h>
#include <gtk/gtkgesturepan.h>
#include <gtk/gtkgesturerotate.h>
#include <gtk/gtkgesturesingle.h>
#include <gtk/gtkgestureswipe.h>

14
gtk/gtkenums.h
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@ -1063,4 +1063,18 @@ typedef enum
GTK_EVENT_SEQUENCE_DENIED
} GtkEventSequenceState;
typedef enum
{
GTK_PAN_DIRECTION_LEFT,
GTK_PAN_DIRECTION_RIGHT,
GTK_PAN_DIRECTION_UP,
GTK_PAN_DIRECTION_DOWN
} GtkPanDirection;
typedef enum
{
GTK_PAN_ORIENTATION_VERTICAL,
GTK_PAN_ORIENTATION_HORIZONTAL
} GtkPanOrientation;
#endif /* __GTK_ENUMS_H__ */

274
gtk/gtkgesturepan.c Normal file
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@ -0,0 +1,274 @@
/* GTK - The GIMP Toolkit
* Copyright (C) 2014, Red Hat, Inc.
*
* 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/>.
*
* Author(s): Carlos Garnacho <carlosg@gnome.org>
*/
#include "config.h"
#include <gtk/gtkgesturepan.h>
#include "gtktypebuiltins.h"
#include "gtkprivate.h"
#include "gtkintl.h"
typedef struct _GtkGesturePanPrivate GtkGesturePanPrivate;
struct _GtkGesturePanPrivate
{
guint orientation : 2;
guint panning : 1;
};
enum {
PROP_ORIENTATION = 1
};
enum {
PAN,
N_SIGNALS
};
static guint signals[N_SIGNALS] = { 0 };
G_DEFINE_TYPE (GtkGesturePan, gtk_gesture_pan, GTK_TYPE_GESTURE_DRAG)
static void
gtk_gesture_pan_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GtkGesturePanPrivate *priv;
priv = gtk_gesture_pan_get_instance_private (GTK_GESTURE_PAN (object));
switch (prop_id)
{
case PROP_ORIENTATION:
g_value_set_enum (value, priv->orientation);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
}
static void
gtk_gesture_pan_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
switch (prop_id)
{
case PROP_ORIENTATION:
gtk_gesture_pan_set_orientation (GTK_GESTURE_PAN (object),
g_value_get_enum (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
}
static void
direction_from_offset (gdouble offset_x,
gdouble offset_y,
GtkPanOrientation orientation,
GtkPanDirection *direction)
{
if (orientation == GTK_PAN_ORIENTATION_HORIZONTAL)
{
if (offset_x > 0)
*direction = GTK_PAN_DIRECTION_RIGHT;
else
*direction = GTK_PAN_DIRECTION_LEFT;
}
else if (orientation == GTK_PAN_ORIENTATION_VERTICAL)
{
if (offset_y > 0)
*direction = GTK_PAN_DIRECTION_DOWN;
else
*direction = GTK_PAN_DIRECTION_UP;
}
else
g_assert_not_reached ();
}
static gboolean
guess_direction (GtkGesturePan *gesture,
gdouble offset_x,
gdouble offset_y,
GtkPanDirection *direction)
{
gdouble abs_x, abs_y;
abs_x = ABS (offset_x);
abs_y = ABS (offset_y);
#define FACTOR 3
if (abs_x > abs_y * FACTOR)
direction_from_offset (offset_x, offset_y,
GTK_PAN_ORIENTATION_HORIZONTAL, direction);
else if (abs_y > abs_x * FACTOR)
direction_from_offset (offset_x, offset_y,
GTK_PAN_ORIENTATION_VERTICAL, direction);
else
return FALSE;
return TRUE;
#undef FACTOR
}
static gboolean
check_orientation_matches (GtkGesturePan *gesture,
GtkPanDirection direction)
{
GtkGesturePanPrivate *priv = gtk_gesture_pan_get_instance_private (gesture);
if (priv->orientation == 0)
return FALSE;
return (((direction == GTK_PAN_DIRECTION_LEFT ||
direction == GTK_PAN_DIRECTION_RIGHT) &&
priv->orientation == GTK_PAN_ORIENTATION_HORIZONTAL) ||
((direction == GTK_PAN_DIRECTION_UP ||
direction == GTK_PAN_DIRECTION_DOWN) &&
priv->orientation == GTK_PAN_ORIENTATION_VERTICAL));
}
static void
gtk_gesture_pan_drag_update (GtkGestureDrag *gesture,
gdouble offset_x,
gdouble offset_y)
{
GtkGesturePanPrivate *priv;
GtkPanDirection direction;
GtkGesturePan *pan;
gdouble offset;
pan = GTK_GESTURE_PAN (gesture);
priv = gtk_gesture_pan_get_instance_private (pan);
if (!priv->panning)
{
if (!guess_direction (pan, offset_x, offset_y, &direction))
return;
if (!check_orientation_matches (pan, direction))
{
gtk_gesture_set_state (GTK_GESTURE (gesture),
GTK_EVENT_SEQUENCE_DENIED);
return;
}
priv->panning = TRUE;
}
else
direction_from_offset (offset_x, offset_y, priv->orientation, &direction);
offset = (priv->orientation == GTK_PAN_ORIENTATION_VERTICAL) ?
ABS (offset_y) : ABS (offset_x);
g_signal_emit (gesture, signals[PAN], 0, direction, offset);
}
static void
gtk_gesture_pan_drag_end (GtkGestureDrag *gesture,
gdouble offset_x,
gdouble offset_y)
{
GtkGesturePanPrivate *priv;
priv = gtk_gesture_pan_get_instance_private (GTK_GESTURE_PAN (gesture));
priv->panning = FALSE;
}
static void
gtk_gesture_pan_class_init (GtkGesturePanClass *klass)
{
GtkGestureDragClass *drag_gesture_class = GTK_GESTURE_DRAG_CLASS (klass);
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->get_property = gtk_gesture_pan_get_property;
object_class->set_property = gtk_gesture_pan_set_property;
drag_gesture_class->drag_update = gtk_gesture_pan_drag_update;
drag_gesture_class->drag_end = gtk_gesture_pan_drag_end;
g_object_class_install_property (object_class,
PROP_ORIENTATION,
g_param_spec_enum ("orientation",
P_("Orientation"),
P_("Allowed orientations"),
GTK_TYPE_PAN_ORIENTATION,
GTK_PAN_ORIENTATION_HORIZONTAL,
GTK_PARAM_READWRITE));
signals[PAN] =
g_signal_new ("pan",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GtkGesturePanClass, pan),
NULL, NULL, NULL,
G_TYPE_NONE, 1, GTK_TYPE_PAN_DIRECTION);
}
static void
gtk_gesture_pan_init (GtkGesturePan *gesture)
{
GtkGesturePanPrivate *priv;
priv = gtk_gesture_pan_get_instance_private (gesture);
priv->orientation = GTK_PAN_ORIENTATION_HORIZONTAL;
}
GtkGesture *
gtk_gesture_pan_new (GtkWidget *widget,
GtkPanOrientation orientation)
{
g_return_val_if_fail (GTK_IS_WIDGET (widget), NULL);
return g_object_new (GTK_TYPE_GESTURE_PAN,
"widget", widget,
"orientation", orientation,
NULL);
}
GtkPanOrientation
gtk_gesture_pan_get_orientation (GtkGesturePan *gesture)
{
GtkGesturePanPrivate *priv;
g_return_val_if_fail (GTK_IS_GESTURE_PAN (gesture), 0);
priv = gtk_gesture_pan_get_instance_private (gesture);
return priv->orientation;
}
void
gtk_gesture_pan_set_orientation (GtkGesturePan *gesture,
GtkPanOrientation orientation)
{
GtkGesturePanPrivate *priv;
g_return_if_fail (GTK_IS_GESTURE_PAN (gesture));
g_return_if_fail (orientation == GTK_PAN_ORIENTATION_HORIZONTAL ||
orientation == GTK_PAN_ORIENTATION_VERTICAL);
priv = gtk_gesture_pan_get_instance_private (gesture);
if (priv->orientation == orientation)
return;
priv->orientation = orientation;
g_object_notify (G_OBJECT (gesture), "orientation");
}

75
gtk/gtkgesturepan.h Normal file
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@ -0,0 +1,75 @@
/* GTK - The GIMP Toolkit
* Copyright (C) 2014, Red Hat, Inc.
*
* 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/>.
*
* Author(s): Carlos Garnacho <carlosg@gnome.org>
*/
#ifndef __GTK_GESTURE_PAN_H__
#define __GTK_GESTURE_PAN_H__
#if !defined (__GTK_H_INSIDE__) && !defined (GTK_COMPILATION)
#error "Only <gtk/gtk.h> can be included directly."
#endif
#include <gtk/gtkenums.h>
#include <gtk/gtkgesturedrag.h>
G_BEGIN_DECLS
#define GTK_TYPE_GESTURE_PAN (gtk_gesture_pan_get_type ())
#define GTK_GESTURE_PAN(o) (G_TYPE_CHECK_INSTANCE_CAST ((o), GTK_TYPE_GESTURE_PAN, GtkGesturePan))
#define GTK_GESTURE_PAN_CLASS(k) (G_TYPE_CHECK_CLASS_CAST ((k), GTK_TYPE_GESTURE_PAN, GtkGesturePanClass))
#define GTK_IS_GESTURE_PAN(o) (G_TYPE_CHECK_INSTANCE_TYPE ((o), GTK_TYPE_GESTURE_PAN))
#define GTK_IS_GESTURE_PAN_CLASS(k) (G_TYPE_CHECK_CLASS_TYPE ((k), GTK_TYPE_GESTURE_PAN))
#define GTK_GESTURE_PAN_GET_CLASS(o) (G_TYPE_INSTANCE_GET_CLASS ((o), GTK_TYPE_GESTURE_PAN, GtkGesturePanClass))
typedef struct _GtkGesturePan GtkGesturePan;
typedef struct _GtkGesturePanClass GtkGesturePanClass;
struct _GtkGesturePan
{
GtkGestureDrag parent_instance;
};
struct _GtkGesturePanClass
{
GtkGestureDragClass parent_class;
void (* pan) (GtkGesturePan *gesture,
GtkPanDirection direction,
gdouble offset);
/*< private >*/
gpointer padding[10];
};
GDK_AVAILABLE_IN_3_14
GType gtk_gesture_pan_get_type (void) G_GNUC_CONST;
GDK_AVAILABLE_IN_3_14
GtkGesture * gtk_gesture_pan_new (GtkWidget *widget,
GtkPanOrientation orientation);
GDK_AVAILABLE_IN_3_14
GtkPanOrientation gtk_gesture_pan_get_orientation (GtkGesturePan *gesture);
GDK_AVAILABLE_IN_3_14
void gtk_gesture_pan_set_orientation (GtkGesturePan *gesture,
GtkPanOrientation orientation);
G_END_DECLS
#endif /* __GTK_GESTURE_PAN_H__ */