/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* Map widget.
*
* Copyright (C) 2000-2001 Ximian, Inc.
*
* Authors: Hans Petter Jansson <hpj@ximian.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
* License as published by the Free Software Foundation.
*
* This program 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include <config.h>
#include <math.h>
#include <stdlib.h>
#include <gdk/gdkkeysyms.h>
#include <gtk/gtksignal.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <libart_lgpl/art_filterlevel.h>
#include <glib/gi18n.h>
#include "e-util/e-util-private.h"
#include "e-util/e-util.h"
#include "e-map.h"
/* Scroll step increment */
#define SCROLL_STEP_SIZE 32
/* */
#define E_MAP_GET_WIDTH(map) gdk_pixbuf_get_width(((EMapPrivate *) E_MAP(map)->priv)->map_render_pixbuf)
#define E_MAP_GET_HEIGHT(map) gdk_pixbuf_get_height(((EMapPrivate *) E_MAP(map)->priv)->map_render_pixbuf)
/* Zoom state - keeps track of animation hacks */
typedef enum
{
E_MAP_ZOOMED_IN,
E_MAP_ZOOMED_OUT,
E_MAP_ZOOMING_IN,
E_MAP_ZOOMING_OUT
}
EMapZoomState;
/* Private part of the EMap structure */
typedef struct
{
/* Pointer to map image */
GdkPixbuf *map_pixbuf, *map_render_pixbuf;
/* Settings */
gboolean frozen, smooth_zoom;
/* Adjustments for scrolling */
GtkAdjustment *hadj;
GtkAdjustment *vadj;
/* Current scrolling offsets */
int xofs, yofs;
/* Realtime zoom data */
EMapZoomState zoom_state;
double zoom_target_long, zoom_target_lat;
/* Dots */
GPtrArray *points;
}
EMapPrivate;
/* Internal prototypes */
static void e_map_class_init (EMapClass *class);
static void e_map_init (EMap *view);
static void e_map_finalize (GObject *object);
static void e_map_destroy (GtkObject *object);
static void e_map_unmap (GtkWidget *widget);
static void e_map_realize (GtkWidget *widget);
static void e_map_unrealize (GtkWidget *widget);
static void e_map_size_request (GtkWidget *widget, GtkRequisition *requisition);
static void e_map_size_allocate (GtkWidget *widget, GtkAllocation *allocation);
static gint e_map_button_press (GtkWidget *widget, GdkEventButton *event);
static gint e_map_button_release (GtkWidget *widget, GdkEventButton *event);
static gint e_map_motion (GtkWidget *widget, GdkEventMotion *event);
static gint e_map_expose (GtkWidget *widget, GdkEventExpose *event);
static gint e_map_key_press (GtkWidget *widget, GdkEventKey *event);
static void e_map_set_scroll_adjustments (GtkWidget *widget, GtkAdjustment *hadj, GtkAdjustment *vadj);
static void update_render_pixbuf (EMap *map, ArtFilterLevel interp, gboolean render_overlays);
static void set_scroll_area (EMap *view);
static void request_paint_area (EMap *view, GdkRectangle *area);
static void center_at (EMap *map, int x, int y, gboolean scroll);
static void smooth_center_at (EMap *map, int x, int y);
static void scroll_to (EMap *view, int x, int y);
static void zoom_do (EMap *map);
static gint load_map_background (EMap *view, gchar *name);
static void adjustment_changed_cb (GtkAdjustment *adj, gpointer data);
static void update_and_paint (EMap *map);
static void update_render_point (EMap *map, EMapPoint *point);
static void repaint_point (EMap *map, EMapPoint *point);
static GtkWidgetClass *parent_class;
/* ----------------- *
* Widget management *
* ----------------- */
/**
* e_map_get_type:
* @void:
*
* Registers the #EMap class if necessary, and returns the type ID
* associated to it.
*
* Return value: The type ID of the #EMap class.
**/
GtkType
e_map_get_type (void)
{
static GtkType e_map_type = 0;
if (!e_map_type)
{
static const GtkTypeInfo e_map_info =
{
"EMap",
sizeof (EMap),
sizeof (EMapClass),
(GtkClassInitFunc) e_map_class_init,
(GtkObjectInitFunc) e_map_init,
NULL, /* reserved_1 */
NULL, /* reserved_2 */
(GtkClassInitFunc) NULL
};
e_map_type = gtk_type_unique (GTK_TYPE_WIDGET, &e_map_info);
}
return e_map_type;
}
/* Class initialization function for the map view */
static void
e_map_class_init (EMapClass *class)
{
GObjectClass *gobject_class;
GtkObjectClass *object_class;
GtkWidgetClass *widget_class;
gobject_class = (GObjectClass *) class;
object_class = (GtkObjectClass *) class;
widget_class = (GtkWidgetClass *) class;
parent_class = g_type_class_ref(GTK_TYPE_WIDGET);
gobject_class->finalize = e_map_finalize;
object_class->destroy = e_map_destroy;
class->set_scroll_adjustments = e_map_set_scroll_adjustments;
widget_class->set_scroll_adjustments_signal = g_signal_new ("set_scroll_adjustments",
G_OBJECT_CLASS_TYPE (gobject_class),
G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
G_STRUCT_OFFSET (EMapClass, set_scroll_adjustments),
NULL, NULL,
e_util_marshal_NONE__OBJECT_OBJECT,
G_TYPE_NONE, 2,
GTK_TYPE_ADJUSTMENT,
GTK_TYPE_ADJUSTMENT);
widget_class->unmap = e_map_unmap;
widget_class->realize = e_map_realize;
widget_class->unrealize = e_map_unrealize;
widget_class->size_request = e_map_size_request;
widget_class->size_allocate = e_map_size_allocate;
widget_class->button_press_event = e_map_button_press;
widget_class->button_release_event = e_map_button_release;
widget_class->motion_notify_event = e_map_motion;
widget_class->expose_event = e_map_expose;
widget_class->key_press_event = e_map_key_press;
}
/* Object initialization function for the map view */
static void
e_map_init (EMap *view)
{
EMapPrivate *priv;
char *map_file_name = g_build_filename (EVOLUTION_IMAGES, "world_map-960.png", NULL);
priv = g_new0 (EMapPrivate, 1);
view->priv = priv;
load_map_background (view, map_file_name);
g_free (map_file_name);
priv->frozen = FALSE;
priv->smooth_zoom = TRUE;
priv->zoom_state = E_MAP_ZOOMED_OUT;
priv->points = g_ptr_array_new ();
GTK_WIDGET_SET_FLAGS (view, GTK_CAN_FOCUS);
GTK_WIDGET_UNSET_FLAGS (view, GTK_NO_WINDOW);
}
/* Destroy handler for the map view */
static void
e_map_destroy (GtkObject *object)
{
EMap *view;
EMapPrivate *priv;
g_return_if_fail (object != NULL);
g_return_if_fail (IS_E_MAP (object));
view = E_MAP (object);
priv = view->priv;
g_signal_handlers_disconnect_by_func (priv->hadj, adjustment_changed_cb, view);
g_signal_handlers_disconnect_by_func (priv->vadj, adjustment_changed_cb, view);
if (GTK_OBJECT_CLASS (parent_class)->destroy)
(*GTK_OBJECT_CLASS (parent_class)->destroy) (object);
}
/* Finalize handler for the map view */
static void
e_map_finalize (GObject *object)
{
EMap *view;
EMapPrivate *priv;
g_return_if_fail (object != NULL);
g_return_if_fail (IS_E_MAP (object));
view = E_MAP (object);
priv = view->priv;
g_object_unref((priv->hadj));
priv->hadj = NULL;
g_object_unref((priv->vadj));
priv->vadj = NULL;
if (priv->map_pixbuf)
{
g_object_unref (priv->map_pixbuf);
priv->map_pixbuf = NULL;
}
if (priv->map_render_pixbuf)
{
g_object_unref (priv->map_render_pixbuf);
priv->map_render_pixbuf = NULL;
}
g_free (priv);
view->priv = NULL;
if (G_OBJECT_CLASS (parent_class)->finalize)
(*G_OBJECT_CLASS (parent_class)->finalize) (object);
}
/* Unmap handler for the map view */
static void
e_map_unmap (GtkWidget *widget)
{
g_return_if_fail (widget != NULL);
g_return_if_fail (IS_E_MAP (widget));
if (GTK_WIDGET_CLASS (parent_class)->unmap)
(*GTK_WIDGET_CLASS (parent_class)->unmap) (widget);
}
/* Realize handler for the map view */
static void
e_map_realize (GtkWidget *widget)
{
GdkWindowAttr attr;
int attr_mask;
g_return_if_fail (widget != NULL);
g_return_if_fail (IS_E_MAP (widget));
GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
attr.window_type = GDK_WINDOW_CHILD;
attr.x = widget->allocation.x;
attr.y = widget->allocation.y;
attr.width = widget->allocation.width;
attr.height = widget->allocation.height;
attr.wclass = GDK_INPUT_OUTPUT;
attr.visual = gdk_rgb_get_visual ();
attr.colormap = gdk_rgb_get_colormap ();
attr.event_mask = gtk_widget_get_events (widget) |
GDK_EXPOSURE_MASK | GDK_BUTTON_PRESS_MASK | GDK_KEY_PRESS_MASK |
GDK_POINTER_MOTION_MASK;
attr_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
widget->window = gdk_window_new (gtk_widget_get_parent_window (widget), &attr, attr_mask);
gdk_window_set_user_data (widget->window, widget);
widget->style = gtk_style_attach (widget->style, widget->window);
gdk_window_set_back_pixmap (widget->window, NULL, FALSE);
update_render_pixbuf (E_MAP (widget), GDK_INTERP_BILINEAR, TRUE);
}
/* Unrealize handler for the map view */
static void
e_map_unrealize (GtkWidget *widget)
{
g_return_if_fail (widget != NULL);
g_return_if_fail (IS_E_MAP (widget));
if (GTK_WIDGET_CLASS (parent_class)->unrealize)
(*GTK_WIDGET_CLASS (parent_class)->unrealize) (widget);
}
/* Size_request handler for the map view */
static void
e_map_size_request (GtkWidget *widget, GtkRequisition *requisition)
{
EMap *view;
EMapPrivate *priv;
g_return_if_fail (widget != NULL);
g_return_if_fail (IS_E_MAP (widget));
g_return_if_fail (requisition != NULL);
view = E_MAP (widget);
priv = view->priv;
/* TODO: Put real sizes here. */
requisition->width = gdk_pixbuf_get_width (priv->map_pixbuf);
requisition->height = gdk_pixbuf_get_height (priv->map_pixbuf);
}
/* Size_allocate handler for the map view */
static void
e_map_size_allocate (GtkWidget *widget, GtkAllocation *allocation)
{
EMap *view;
GdkRectangle area;
g_return_if_fail (widget != NULL);
g_return_if_fail (IS_E_MAP (widget));
g_return_if_fail (allocation != NULL);
view = E_MAP (widget);
/* Resize the window */
widget->allocation = *allocation;
if (GTK_WIDGET_REALIZED (widget))
{
gdk_window_move_resize (widget->window, allocation->x, allocation->y, allocation->width, allocation->height);
area.x = 0;
area.y = 0;
area.width = allocation->width;
area.height = allocation->height;
request_paint_area (E_MAP (widget), &area);
}
update_render_pixbuf (view, GDK_INTERP_BILINEAR, TRUE);
}
/* Button press handler for the map view */
static gint
e_map_button_press (GtkWidget *widget, GdkEventButton *event)
{
if (!GTK_WIDGET_HAS_FOCUS (widget)) gtk_widget_grab_focus (widget);
return TRUE;
}
/* Button release handler for the map view */
static gint
e_map_button_release (GtkWidget *widget, GdkEventButton *event)
{
if (event->button != 1) return FALSE;
gdk_pointer_ungrab (event->time);
return TRUE;
}
/* Motion handler for the map view */
static gint
e_map_motion (GtkWidget *widget, GdkEventMotion *event)
{
return FALSE;
/*
* if (event->is_hint)
* gdk_window_get_pointer(widget->window, &x, &y, &mods);
* else
* {
* x = event->x;
* y = event->y;
* }
*
* return TRUE;
*/
}
/* Expose handler for the map view */
static gint
e_map_expose (GtkWidget *widget, GdkEventExpose *event)
{
EMap *view;
g_return_val_if_fail (widget != NULL, FALSE);
g_return_val_if_fail (IS_E_MAP (widget), FALSE);
g_return_val_if_fail (event != NULL, FALSE);
view = E_MAP (widget);
request_paint_area (view, &event->area);
return TRUE;
}
/* Set_scroll_adjustments handler for the map view */
static void
e_map_set_scroll_adjustments (GtkWidget *widget, GtkAdjustment *hadj, GtkAdjustment *vadj)
{
EMap *view;
EMapPrivate *priv;
gboolean need_adjust;
g_return_if_fail (widget != NULL);
g_return_if_fail (IS_E_MAP (widget));
view = E_MAP (widget);
priv = view->priv;
if (hadj) g_return_if_fail (GTK_IS_ADJUSTMENT (hadj));
else hadj = GTK_ADJUSTMENT (gtk_adjustment_new (0.0, 0.0, 0.0, 0.0, 0.0, 0.0));
if (vadj) g_return_if_fail (GTK_IS_ADJUSTMENT (vadj));
else vadj = GTK_ADJUSTMENT (gtk_adjustment_new (0.0, 0.0, 0.0, 0.0, 0.0, 0.0));
if (priv->hadj && priv->hadj != hadj)
{
g_signal_handlers_disconnect_by_func (priv->hadj,
adjustment_changed_cb,
view);
g_object_unref (priv->hadj);
}
if (priv->vadj && priv->vadj != vadj)
{
g_signal_handlers_disconnect_by_func (priv->vadj,
adjustment_changed_cb,
view);
g_object_unref (priv->vadj);
}
need_adjust = FALSE;
if (priv->hadj != hadj)
{
priv->hadj = hadj;
g_object_ref_sink (priv->hadj);
g_signal_connect (priv->hadj, "value_changed",
G_CALLBACK (adjustment_changed_cb), view);
need_adjust = TRUE;
}
if (priv->vadj != vadj)
{
priv->vadj = vadj;
g_object_ref_sink (priv->vadj);
g_signal_connect (priv->vadj, "value_changed",
G_CALLBACK (adjustment_changed_cb), view);
need_adjust = TRUE;
}
if (need_adjust) adjustment_changed_cb (NULL, view);
}
/* Key press handler for the map view */
static gint
e_map_key_press (GtkWidget *widget, GdkEventKey *event)
{
EMap *view;
EMapPrivate *priv;
gboolean do_scroll;
int xofs, yofs;
view = E_MAP (widget);
priv = view->priv;
do_scroll = FALSE;
xofs = yofs = 0;
switch (event->keyval)
{
case GDK_Up:
do_scroll = TRUE;
xofs = 0;
yofs = -SCROLL_STEP_SIZE;
break;
case GDK_Down:
do_scroll = TRUE;
xofs = 0;
yofs = SCROLL_STEP_SIZE;
break;
case GDK_Left:
do_scroll = TRUE;
xofs = -SCROLL_STEP_SIZE;
yofs = 0;
break;
case GDK_Right:
do_scroll = TRUE;
xofs = SCROLL_STEP_SIZE;
yofs = 0;
break;
default:
return FALSE;
}
if (do_scroll)
{
int x, y;
x = CLAMP (priv->xofs + xofs, 0, priv->hadj->upper - priv->hadj->page_size);
y = CLAMP (priv->yofs + yofs, 0, priv->vadj->upper - priv->vadj->page_size);
scroll_to (view, x, y);
gtk_signal_handler_block_by_data (GTK_OBJECT (priv->hadj), view);
gtk_signal_handler_block_by_data (GTK_OBJECT (priv->vadj), view);
priv->hadj->value = x;
priv->vadj->value = y;
gtk_signal_emit_by_name (GTK_OBJECT (priv->hadj), "value_changed");
gtk_signal_emit_by_name (GTK_OBJECT (priv->vadj), "value_changed");
gtk_signal_handler_unblock_by_data (GTK_OBJECT (priv->hadj), view);
gtk_signal_handler_unblock_by_data (GTK_OBJECT (priv->vadj), view);
}
return TRUE;
}
/* ---------------- *
* Widget interface *
* ---------------- */
/**
* e_map_new:
* @void:
*
* Creates a new empty map widget.
*
* Return value: A newly-created map widget.
**/
EMap *
e_map_new ()
{
GtkWidget *widget;
AtkObject *a11y;
widget = g_object_new (TYPE_E_MAP, NULL);
a11y = gtk_widget_get_accessible (widget);
atk_object_set_name (a11y, _("World Map"));
atk_object_set_role (a11y, ATK_ROLE_IMAGE);
atk_object_set_description (a11y, _("Mouse-based interactive map widget for selecting timezone. Keyboard users should select the timezone from the below combo box instead."));
return (E_MAP (widget));
}
/* --- Coordinate translation --- */
/* These functions translate coordinates between longitude/latitude and
* the image x/y offsets, using the equidistant cylindrical projection.
*
* Longitude E <-180, 180]
* Latitude E <-90, 90] */
void
e_map_window_to_world (EMap *map, double win_x, double win_y, double *world_longitude, double *world_latitude)
{
EMapPrivate *priv;
int width, height;
g_return_if_fail (map);
priv = map->priv;
g_return_if_fail (GTK_WIDGET_REALIZED (GTK_WIDGET (map)));
width = gdk_pixbuf_get_width (priv->map_render_pixbuf);
height = gdk_pixbuf_get_height (priv->map_render_pixbuf);
*world_longitude = (win_x + priv->xofs - (double) width / 2.0) /
((double) width / 2.0) * 180.0;
*world_latitude = ((double) height / 2.0 - win_y - priv->yofs) /
((double) height / 2.0) * 90.0;
}
void
e_map_world_to_window (EMap *map, double world_longitude, double world_latitude, double *win_x, double *win_y)
{
EMapPrivate *priv;
int width, height;
g_return_if_fail (map);
priv = map->priv;
g_return_if_fail (priv->map_render_pixbuf);
g_return_if_fail (world_longitude >= -180.0 && world_longitude <= 180.0);
g_return_if_fail (world_latitude >= -90.0 && world_latitude <= 90.0);
width = gdk_pixbuf_get_width (priv->map_render_pixbuf);
height = gdk_pixbuf_get_height (priv->map_render_pixbuf);
*win_x = (width / 2.0 + (width / 2.0) * world_longitude / 180.0) - priv->xofs;
*win_y = (height / 2.0 - (height / 2.0) * world_latitude / 90.0) - priv->yofs;
#ifdef DEBUG
printf ("Map size: (%d, %d)\nCoords: (%.1f, %.1f) -> (%.1f, %.1f)\n---\n", width, height, world_longitude, world_latitude, *win_x, *win_y);
#endif
}
/* --- Zoom --- */
double
e_map_get_magnification (EMap *map)
{
EMapPrivate *priv;
priv = map->priv;
if (priv->zoom_state == E_MAP_ZOOMED_IN) return 2.0;
else return 1.0;
}
void
e_map_zoom_to_location (EMap *map, double longitude, double latitude)
{
EMapPrivate *priv;
g_return_if_fail (map);
g_return_if_fail (GTK_WIDGET_REALIZED (GTK_WIDGET (map)));
priv = map->priv;
if (priv->zoom_state == E_MAP_ZOOMED_IN) e_map_zoom_out (map);
else if (priv->zoom_state != E_MAP_ZOOMED_OUT) return;
priv->zoom_state = E_MAP_ZOOMING_IN;
priv->zoom_target_long = longitude;
priv->zoom_target_lat = latitude;
zoom_do (map);
}
void
e_map_zoom_out (EMap *map)
{
EMapPrivate *priv;
g_return_if_fail (map);
g_return_if_fail (GTK_WIDGET_REALIZED (GTK_WIDGET (map)));
priv = map->priv;
if (priv->zoom_state != E_MAP_ZOOMED_IN) return;
priv->zoom_state = E_MAP_ZOOMING_OUT;
zoom_do (map);
priv->zoom_state = E_MAP_ZOOMED_OUT;
}
void
e_map_set_smooth_zoom (EMap *map, gboolean state)
{
((EMapPrivate *) map->priv)->smooth_zoom = state;
}
gboolean
e_map_get_smooth_zoom (EMap *map)
{
return (((EMapPrivate *) map->priv)->smooth_zoom);
}
void
e_map_freeze (EMap *map)
{
((EMapPrivate *) map->priv)->frozen = TRUE;
}
void
e_map_thaw (EMap *map)
{
((EMapPrivate *) map->priv)->frozen = FALSE;
update_and_paint (map);
}
/* --- Point manipulation --- */
EMapPoint *
e_map_add_point (EMap *map, gchar *name, double longitude, double latitude, guint32 color_rgba)
{
EMapPrivate *priv;
EMapPoint *point;
priv = map->priv;
point = g_new0 (EMapPoint, 1);
point->name = name; /* Can be NULL */
point->longitude = longitude;
point->latitude = latitude;
point->rgba = color_rgba;
g_ptr_array_add (priv->points, (gpointer) point);
if (!priv->frozen)
{
update_render_point (map, point);
repaint_point (map, point);
}
return point;
}
void
e_map_remove_point (EMap *map, EMapPoint *point)
{
EMapPrivate *priv;
priv = map->priv;
g_ptr_array_remove (priv->points, point);
if (!((EMapPrivate *) map->priv)->frozen)
{
/* FIXME: Re-scaling the whole pixbuf is more than a little
* overkill when just one point is removed */
update_render_pixbuf (map, GDK_INTERP_BILINEAR, TRUE);
repaint_point (map, point);
}
g_free (point);
}
void
e_map_point_get_location (EMapPoint *point, double *longitude, double *latitude)
{
*longitude = point->longitude;
*latitude = point->latitude;
}
gchar *
e_map_point_get_name (EMapPoint *point)
{
return point->name;
}
guint32
e_map_point_get_color_rgba (EMapPoint *point)
{
return point->rgba;
}
void
e_map_point_set_color_rgba (EMap *map, EMapPoint *point, guint32 color_rgba)
{
point->rgba = color_rgba;
if (!((EMapPrivate *) map->priv)->frozen)
{
/* TODO: Redraw area around point only */
update_render_point (map, point);
repaint_point (map, point);
}
}
void
e_map_point_set_data (EMapPoint *point, gpointer data)
{
point->user_data = data;
}
gpointer
e_map_point_get_data (EMapPoint *point)
{
return point->user_data;
}
gboolean
e_map_point_is_in_view (EMap *map, EMapPoint *point)
{
EMapPrivate *priv;
double x, y;
priv = map->priv;
if (!priv->map_render_pixbuf) return FALSE;
e_map_world_to_window (map, point->longitude, point->latitude, &x, &y);
if (x >= 0 && x < GTK_WIDGET (map)->allocation.width &&
y >= 0 && y < GTK_WIDGET (map)->allocation.height)
return TRUE;
return FALSE;
}
EMapPoint *
e_map_get_closest_point (EMap *map, double longitude, double latitude, gboolean in_view)
{
EMapPrivate *priv;
EMapPoint *point_chosen = NULL, *point;
double min_dist = 0.0, dist;
double dx, dy;
int i;
priv = map->priv;
for (i = 0; i < priv->points->len; i++)
{
point = g_ptr_array_index (priv->points, i);
if (in_view && !e_map_point_is_in_view (map, point)) continue;
dx = point->longitude - longitude;
dy = point->latitude - latitude;
dist = dx * dx + dy * dy;
if (!point_chosen || dist < min_dist)
{
min_dist = dist;
point_chosen = point;
}
}
return point_chosen;
}
/* ------------------ *
* Internal functions *
* ------------------ */
static void
repaint_visible (EMap *map)
{
GdkRectangle area;
area.x = 0;
area.y = 0;
area.width = GTK_WIDGET (map)->allocation.width;
area.height = GTK_WIDGET (map)->allocation.height;
request_paint_area (map, &area);
}
static void
update_and_paint (EMap *map)
{
update_render_pixbuf (map, GDK_INTERP_BILINEAR, TRUE);
repaint_visible (map);
}
static gint
load_map_background (EMap *view, gchar *name)
{
EMapPrivate *priv;
GdkPixbuf *pb0;
priv = view->priv;
pb0 = gdk_pixbuf_new_from_file (name, NULL);
if (!pb0)
return FALSE;
if (priv->map_pixbuf) g_object_unref (priv->map_pixbuf);
priv->map_pixbuf = pb0;
update_render_pixbuf (view, GDK_INTERP_BILINEAR, TRUE);
return TRUE;
}
static void
update_render_pixbuf (EMap *map, ArtFilterLevel interp, gboolean render_overlays)
{
EMapPrivate *priv;
EMapPoint *point;
int width, height, orig_width, orig_height;
double zoom;
int i;
if (!GTK_WIDGET_REALIZED (GTK_WIDGET (map))) return;
/* Set up value shortcuts */
priv = map->priv;
width = GTK_WIDGET (map)->allocation.width;
height = GTK_WIDGET (map)->allocation.height;
orig_width = gdk_pixbuf_get_width (priv->map_pixbuf);
orig_height = gdk_pixbuf_get_height (priv->map_pixbuf);
/* Compute scaled width and height based on the extreme dimension */
if ((double) width / orig_width > (double) height / orig_height)
{
zoom = (double) width / (double) orig_width;
}
else
{
zoom = (double) height / (double) orig_height;
}
if (priv->zoom_state == E_MAP_ZOOMED_IN) zoom *= 2.0;
height = (orig_height * zoom) + 0.5;
width = (orig_width * zoom) + 0.5;
/* Reallocate the pixbuf */
if (priv->map_render_pixbuf) g_object_unref (priv->map_render_pixbuf);
priv->map_render_pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, /* No alpha */
8, width, height);
/* Scale the original map into the rendering pixbuf */
if (width > 1 && height > 1)
{
gdk_pixbuf_scale (priv->map_pixbuf, priv->map_render_pixbuf, 0, 0, /* Dest (x, y) */
width, height, 0, 0, /* Offset (x, y) */
zoom, zoom, /* Scale (x, y) */
interp);
}
if (render_overlays)
{
/* Add points */
for (i = 0; i < priv->points->len; i++)
{
point = g_ptr_array_index (priv->points, i);
update_render_point (map, point);
}
}
/* Compute image offsets with respect to window */
set_scroll_area (map);
}
/* Queues a repaint of the specified area in window coordinates */
static void
request_paint_area (EMap *view, GdkRectangle *area)
{
EMapPrivate *priv;
int width, height;
if (!GTK_WIDGET_DRAWABLE (GTK_WIDGET (view)) ||
!GTK_WIDGET_REALIZED (GTK_WIDGET (view))) return;
priv = view->priv;
if (!priv->map_render_pixbuf) return;
width = MIN (area->width, E_MAP_GET_WIDTH (view));
height = MIN (area->height, E_MAP_GET_HEIGHT (view));
/* This satisfies paranoia. To be removed */
if (priv->xofs + width > gdk_pixbuf_get_width (priv->map_render_pixbuf))
width = gdk_pixbuf_get_width (priv->map_render_pixbuf) - priv->xofs;
if (priv->yofs + height > gdk_pixbuf_get_height (priv->map_render_pixbuf))
height = gdk_pixbuf_get_height (priv->map_render_pixbuf) - priv->yofs;
/* We rely on the fast case always being the case, since we load and
* preprocess the source pixbuf ourselves */
if (gdk_pixbuf_get_colorspace (priv->map_render_pixbuf) == GDK_COLORSPACE_RGB && !gdk_pixbuf_get_has_alpha (priv->map_render_pixbuf) &&
gdk_pixbuf_get_bits_per_sample (priv->map_render_pixbuf) == 8)
{
guchar *pixels;
int rowstride;
rowstride = gdk_pixbuf_get_rowstride (priv->map_render_pixbuf);
pixels = gdk_pixbuf_get_pixels (priv->map_render_pixbuf) + (area->y + priv->yofs) * rowstride + 3 * (area->x + priv->xofs);
gdk_draw_rgb_image_dithalign (GTK_WIDGET (view)->window, GTK_WIDGET (view)->style->black_gc, area->x, area->y, width, height, GDK_RGB_DITHER_NORMAL, pixels, rowstride, 0, 0);
return;
}
#ifdef DEBUG
g_print ("Doing hard redraw.\n");
#endif
}
static void
put_pixel_with_clipping (GdkPixbuf *pixbuf, gint x, gint y, guint rgba)
{
gint width, height;
gint rowstride, n_channels;
guchar *pixels, *pixel;
width = gdk_pixbuf_get_width (pixbuf);
height = gdk_pixbuf_get_height (pixbuf);
rowstride = gdk_pixbuf_get_rowstride (pixbuf);
n_channels = gdk_pixbuf_get_n_channels (pixbuf);
pixels = gdk_pixbuf_get_pixels (pixbuf);
if (x < 0 || x >= width || y < 0 || y >= height)
return;
pixel = pixels + (y * rowstride) + (x * n_channels);
*pixel = (rgba >> 24);
*(pixel + 1) = (rgba >> 16) & 0x000000ff;
*(pixel + 2) = (rgba >> 8) & 0x000000ff;
if (n_channels > 3)
{
*(pixel + 3) = rgba & 0x000000ff;
}
}
/* Redraw point in client pixbuf */
static void
update_render_point (EMap *map, EMapPoint *point)
{
EMapPrivate *priv;
GdkPixbuf *pb;
double px, py;
priv = map->priv;
pb = priv->map_render_pixbuf;
if (!pb) return;
e_map_world_to_window (map, point->longitude, point->latitude, &px, &py);
px += priv->xofs;
py += priv->yofs;
put_pixel_with_clipping (pb, px, py, point->rgba);
put_pixel_with_clipping (pb, px - 1, py, point->rgba);
put_pixel_with_clipping (pb, px + 1, py, point->rgba);
put_pixel_with_clipping (pb, px, py - 1, point->rgba);
put_pixel_with_clipping (pb, px, py + 1, point->rgba);
put_pixel_with_clipping (pb, px - 2, py, 0x000000ff);
put_pixel_with_clipping (pb, px + 2, py, 0x000000ff);
put_pixel_with_clipping (pb, px, py - 2, 0x000000ff);
put_pixel_with_clipping (pb, px, py + 2, 0x000000ff);
put_pixel_with_clipping (pb, px - 1, py - 1, 0x000000ff);
put_pixel_with_clipping (pb, px - 1, py + 1, 0x000000ff);
put_pixel_with_clipping (pb, px + 1, py - 1, 0x000000ff);
put_pixel_with_clipping (pb, px + 1, py + 1, 0x000000ff);
}
/* Repaint point on X server */
static void
repaint_point (EMap *map, EMapPoint *point)
{
GdkRectangle area;
double px, py;
if (!e_map_point_is_in_view (map, point)) return;
e_map_world_to_window (map, point->longitude, point->latitude, &px, &py);
area.x = (int) px - 2;
area.y = (int) py - 2;
area.width = 5;
area.height = 5;
request_paint_area (map, &area);
}
static void
center_at (EMap *map, int x, int y, gboolean scroll)
{
EMapPrivate *priv;
int pb_width, pb_height,
view_width, view_height;
priv = map->priv;
pb_width = E_MAP_GET_WIDTH (map);
pb_height = E_MAP_GET_HEIGHT (map);
view_width = GTK_WIDGET (map)->allocation.width;
view_height = GTK_WIDGET (map)->allocation.height;
x = CLAMP (x - (view_width / 2), 0, pb_width - view_width);
y = CLAMP (y - (view_height / 2), 0, pb_height - view_height);
if (scroll) scroll_to (map, x, y);
else
{
priv->xofs = x;
priv->yofs = y;
}
}
static void
smooth_center_at (EMap *map, int x, int y)
{
EMapPrivate *priv;
int pb_width, pb_height,
view_width, view_height;
int dx, dy;
priv = map->priv;
pb_width = E_MAP_GET_WIDTH (map);
pb_height = E_MAP_GET_HEIGHT (map);
view_width = GTK_WIDGET (map)->allocation.width;
view_height = GTK_WIDGET (map)->allocation.height;
x = CLAMP (x - (view_width / 2), 0, pb_width - view_width);
y = CLAMP (y - (view_height / 2), 0, pb_height - view_height);
for (;;)
{
if (priv->xofs == x && priv->yofs == y) break;
dx = (x < priv->xofs) ? -1 : (x > priv->xofs) ? 1 : 0;
dy = (y < priv->yofs) ? -1 : (y > priv->yofs) ? 1 : 0;
scroll_to (map, priv->xofs + dx, priv->yofs + dy);
}
}
/* Scrolls the view to the specified offsets. Does not perform range checking! */
static void
scroll_to (EMap *view, int x, int y)
{
EMapPrivate *priv;
int xofs, yofs;
GdkWindow *window;
GdkGC *gc;
int width, height;
int src_x, src_y;
int dest_x, dest_y;
GdkEvent *event;
priv = view->priv;
/* Compute offsets and check bounds */
xofs = x - priv->xofs;
yofs = y - priv->yofs;
if (xofs == 0 && yofs == 0) return;
priv->xofs = x;
priv->yofs = y;
if (!GTK_WIDGET_DRAWABLE (view)) return;
width = GTK_WIDGET (view)->allocation.width;
height = GTK_WIDGET (view)->allocation.height;
if (abs (xofs) >= width || abs (yofs) >= height)
{
GdkRectangle area;
area.x = 0;
area.y = 0;
area.width = width;
area.height = height;
request_paint_area (view, &area);
return;
}
window = GTK_WIDGET (view)->window;
/* Copy the window area */
src_x = xofs < 0 ? 0 : xofs;
src_y = yofs < 0 ? 0 : yofs;
dest_x = xofs < 0 ? -xofs : 0;
dest_y = yofs < 0 ? -yofs : 0;
gc = gdk_gc_new (window);
gdk_gc_set_exposures (gc, TRUE);
gdk_draw_drawable (GDK_DRAWABLE (window), gc, GDK_DRAWABLE (window), src_x, src_y, dest_x, dest_y, width - abs (xofs), height - abs (yofs));
g_object_unref (gc);
/* Add the scrolled-in region */
if (xofs)
{
GdkRectangle r;
r.x = xofs < 0 ? 0 : width - xofs;
r.y = 0;
r.width = abs (xofs);
r.height = height;
request_paint_area (view, &r);
}
if (yofs)
{
GdkRectangle r;
r.x = 0;
r.y = yofs < 0 ? 0 : height - yofs;
r.width = width;
r.height = abs (yofs);
request_paint_area (view, &r);
}
/* Process graphics exposures */
while ((event = gdk_event_get_graphics_expose (window)) != NULL)
{
gtk_widget_event (GTK_WIDGET (view), event);
if (event->expose.count == 0)
{
gdk_event_free (event);
break;
}
gdk_event_free (event);
}
}
static int divide_seq[] =
{
/* Dividends for divisor of 2 */
-2,
1,
/* Dividends for divisor of 4 */
-4,
1, 3,
/* Dividends for divisor of 8 */
-8,
1, 5, 3, 7,
/* Dividends for divisor of 16 */
-16,
1, 9, 5, 13, 3, 11, 7, 15,
/* Dividends for divisor of 32 */
-32,
1, 17, 9, 25, 5, 21, 13, 29, 3, 19,
11, 27, 7, 23, 15, 31,
/* Dividends for divisor of 64 */
-64,
1, 33, 17, 49, 9, 41, 25, 57, 5, 37,
21, 53, 13, 45, 29, 61, 3, 35, 19, 51,
11, 43, 27, 59, 7, 39, 23, 55, 15, 47,
31, 63,
/* Dividends for divisor of 128 */
-128,
1, 65, 33, 97, 17, 81, 49, 113, 9, 73,
41, 105, 25, 89, 57, 121, 5, 69, 37, 101,
21, 85, 53, 117, 13, 77, 45, 109, 29, 93,
61, 125, 3, 67, 35, 99, 19, 83, 51, 115,
11, 75, 43, 107, 27, 91, 59, 123, 7, 71,
39, 103, 23, 87, 55, 119, 15, 79, 47, 111,
31, 95, 63, 127,
/* Dividends for divisor of 256 */
-256,
1, 129, 65, 193, 33, 161, 97, 225, 17, 145,
81, 209, 49, 177, 113, 241, 9, 137, 73, 201,
41, 169, 105, 233, 25, 153, 89, 217, 57, 185,
121, 249, 5, 133, 69, 197, 37, 165, 101, 229,
21, 149, 85, 213, 53, 181, 117, 245, 13, 141,
77, 205, 45, 173, 109, 237, 29, 157, 93, 221,
61, 189, 125, 253, 3, 131, 67, 195, 35, 163,
99, 227, 19, 147, 83, 211, 51, 179, 115, 243,
11, 139, 75, 203, 43, 171, 107, 235, 27, 155,
91, 219, 59, 187, 123, 251, 7, 135, 71, 199,
39, 167, 103, 231, 23, 151, 87, 215, 55, 183,
119, 247, 15, 143, 79, 207, 47, 175, 111, 239,
31, 159, 95, 223, 63, 191, 127, 255,
0
};
typedef enum
{
AXIS_X,
AXIS_Y
}
AxisType;
static void
blowup_window_area (GdkWindow *window, gint area_x, gint area_y, gint target_x, gint target_y, gint total_width, gint total_height, gfloat zoom_factor)
{
GdkGC *gc;
AxisType strong_axis;
gfloat axis_factor, axis_counter;
gint zoom_chunk;
gint divisor_width = 0, divisor_height = 0;
gint divide_width_index, divide_height_index;
gint area_width, area_height;
gint i, j;
int line;
/* Set up the GC we'll be using */
gc = gdk_gc_new (window);
gdk_gc_set_exposures (gc, FALSE);
/* Get area constraints */
gdk_drawable_get_size (GDK_DRAWABLE (window), &area_width, &area_height);
/* Initialize area division array indexes */
divide_width_index = divide_height_index = 0;
/* Initialize axis counter */
axis_counter = 0.0;
/* Find the strong axis (which is the basis for iteration) and the ratio
* at which the other axis will be scaled.
*
* Also determine how many lines to expand in one fell swoop, and store
* this figure in zoom_chunk. */
if (area_width > area_height)
{
strong_axis = AXIS_X;
axis_factor = (double) area_height / (double) area_width;
zoom_chunk = MAX (1, area_width / 250);
i = (area_width * (zoom_factor - 1.0)) / zoom_chunk;
}
else
{
strong_axis = AXIS_Y;
axis_factor = (double) area_width / (double) area_height;
zoom_chunk = MAX (1, area_height / 250);
i = (area_height * (zoom_factor - 1.0)) / zoom_chunk;
}
/* Go, go, devil bunnies! Gogo devil bunnies! */
for (; i > 0; i--)
{
/* Reset division sequence table indexes as necessary */
if (!divide_seq[divide_width_index]) divide_width_index = 0;
if (!divide_seq[divide_height_index]) divide_height_index = 0;
/* Set new divisor if found in table */
if (divide_seq[divide_width_index] < 0)
divisor_width = abs (divide_seq[divide_width_index++]);
if (divide_seq[divide_height_index] < 0)
divisor_height = abs (divide_seq[divide_height_index++]);
/* Widen */
if (strong_axis == AXIS_X || axis_counter >= 1.0)
{
line = ((divide_seq[divide_width_index] * area_width) / divisor_width) + 0.5;
if ((line < target_x && target_x > area_width / 2) || (line > target_x && target_x > (area_width / 2) + zoom_chunk))
{
/* Push left */
for (j = 0; j < zoom_chunk - 1; j++)
gdk_draw_drawable (GDK_DRAWABLE (window), gc, GDK_DRAWABLE (window), line, 0, line + j + 1, 0, 1, area_height);
gdk_draw_drawable (GDK_DRAWABLE (window), gc, GDK_DRAWABLE (window), zoom_chunk, 0, 0, 0, line, area_height);
if (line > target_x) target_x -= zoom_chunk;
}
else
{
/* Push right */
for (j = 0; j < zoom_chunk - 1; j++)
gdk_draw_drawable (GDK_DRAWABLE (window), gc, GDK_DRAWABLE (window), line - zoom_chunk, 0, line + j - (zoom_chunk - 1), 0, 1, area_height);
gdk_draw_drawable (GDK_DRAWABLE (window), gc, GDK_DRAWABLE (window), line - zoom_chunk, 0, line, 0, area_width - line, area_height);
if (line < target_x) target_x += zoom_chunk;
}
}
if (strong_axis == AXIS_Y || axis_counter >= 1.0)
{
/* Heighten */
line = ((divide_seq[divide_height_index] * area_height) / divisor_height) + 0.5;
if ((line < target_y && target_y > area_height / 2) || (line > target_y && target_y > (area_height / 2) + zoom_chunk))
{
/* Push up */
for (j = 0; j < zoom_chunk - 1; j++)
gdk_draw_drawable (GDK_DRAWABLE (window), gc, GDK_DRAWABLE (window), 0, line, 0, line + j + 1, area_width, 1);
gdk_draw_drawable (GDK_DRAWABLE (window), gc, GDK_DRAWABLE (window), 0, zoom_chunk, 0, 0, area_width, line);
if (line > target_y) target_y -= zoom_chunk;
}
else
{
/* Push down */
for (j = 0; j < zoom_chunk - 1; j++)
gdk_draw_drawable (GDK_DRAWABLE (window), gc, GDK_WINDOW (window), 0, line - zoom_chunk, 0, line + j - (zoom_chunk - 1), area_width, 1);
gdk_draw_drawable (GDK_DRAWABLE (window), gc, GDK_DRAWABLE (window), 0, line - zoom_chunk, 0, line, area_width, area_height - line);
if (line < target_y) target_y += zoom_chunk;
}
}
divide_width_index++;
divide_height_index++;
if (axis_counter >= 1.0) axis_counter -= 1.0;
axis_counter += axis_factor;
}
/* Free our GC */
g_object_unref (gc);
}
static void
zoom_in_smooth (EMap *map)
{
GdkRectangle area;
EMapPrivate *priv;
GdkWindow *window;
int width, height;
double x, y;
g_return_if_fail (map);
g_return_if_fail (GTK_WIDGET_REALIZED (GTK_WIDGET (map)));
area.x = 0;
area.y = 0;
area.width = GTK_WIDGET (map)->allocation.width;
area.height = GTK_WIDGET (map)->allocation.height;
priv = map->priv;
window = GTK_WIDGET (map)->window;
width = gdk_pixbuf_get_width (priv->map_render_pixbuf);
height = gdk_pixbuf_get_height (priv->map_render_pixbuf);
/* Center the target point as much as possible */
e_map_world_to_window (map, priv->zoom_target_long, priv->zoom_target_lat, &x, &y);
smooth_center_at (map, x + priv->xofs, y + priv->yofs);
/* Render and paint a temporary map without overlays, so they don't get in
* the way (look ugly) while zooming */
update_render_pixbuf (map, GDK_INTERP_BILINEAR, FALSE);
request_paint_area (map, &area);
/* Find out where in the area we're going to zoom to */
e_map_world_to_window (map, priv->zoom_target_long, priv->zoom_target_lat, &x, &y);
/* Pre-render the zoomed-in map, so we can put it there quickly when the
* blowup sequence ends */
priv->zoom_state = E_MAP_ZOOMED_IN;
update_render_pixbuf (map, GDK_INTERP_BILINEAR, TRUE);
/* Do the blowup */
blowup_window_area (window, priv->xofs, priv->yofs, x, y, width, height, 1.68);
/* Set new scroll offsets and paint the zoomed map */
e_map_world_to_window (map, priv->zoom_target_long, priv->zoom_target_lat, &x, &y);
priv->xofs = CLAMP (priv->xofs + x - area.width / 2.0, 0, E_MAP_GET_WIDTH (map) - area.width);
priv->yofs = CLAMP (priv->yofs + y - area.height / 2.0, 0, E_MAP_GET_HEIGHT (map) - area.height);
request_paint_area (map, &area);
}
static void
zoom_in (EMap *map)
{
GdkRectangle area;
EMapPrivate *priv;
double x, y;
priv = map->priv;
area.x = 0;
area.y = 0;
area.width = GTK_WIDGET (map)->allocation.width;
area.height = GTK_WIDGET (map)->allocation.height;
priv->zoom_state = E_MAP_ZOOMED_IN;
update_render_pixbuf (map, GDK_INTERP_BILINEAR, TRUE);
e_map_world_to_window (map, priv->zoom_target_long, priv->zoom_target_lat, &x, &y);
priv->xofs = CLAMP (priv->xofs + x - area.width / 2.0, 0, E_MAP_GET_WIDTH (map) - area.width);
priv->yofs = CLAMP (priv->yofs + y - area.height / 2.0, 0, E_MAP_GET_HEIGHT (map) - area.height);
request_paint_area (map, &area);
}
static void
zoom_out (EMap *map)
{
GdkRectangle area;
EMapPrivate *priv;
double longitude, latitude;
double x, y;
priv = map->priv;
area.x = 0;
area.y = 0;
area.width = GTK_WIDGET (map)->allocation.width;
area.height = GTK_WIDGET (map)->allocation.height;
/* Must be done before update_render_pixbuf() */
e_map_window_to_world (map, area.width / 2, area.height / 2,
&longitude, &latitude);
priv->zoom_state = E_MAP_ZOOMED_OUT;
update_render_pixbuf (map, GDK_INTERP_BILINEAR, TRUE);
e_map_world_to_window (map, longitude, latitude, &x, &y);
center_at (map, x + priv->xofs, y + priv->yofs, FALSE);
/* request_paint_area (map, &area); */
repaint_visible (map);
}
static void
zoom_do (EMap *map)
{
EMapPrivate *priv;
priv = map->priv;
gtk_signal_handler_block_by_data (GTK_OBJECT (priv->hadj), map);
gtk_signal_handler_block_by_data (GTK_OBJECT (priv->vadj), map);
if (priv->zoom_state == E_MAP_ZOOMING_IN)
{
if (e_map_get_smooth_zoom (map)) zoom_in_smooth (map);
else zoom_in (map);
}
else if (priv->zoom_state == E_MAP_ZOOMING_OUT)
{
/* if (e_map_get_smooth_zoom(map)) zoom_out_smooth(map); */
zoom_out (map);
}
gtk_signal_handler_unblock_by_data (GTK_OBJECT (priv->hadj), map);
gtk_signal_handler_unblock_by_data (GTK_OBJECT (priv->vadj), map);
set_scroll_area(map);
}
/* Callback used when an adjustment is changed */
static void
adjustment_changed_cb (GtkAdjustment *adj, gpointer data)
{
EMap *view;
EMapPrivate *priv;
view = E_MAP (data);
priv = view->priv;
scroll_to (view, priv->hadj->value, priv->vadj->value);
}
static void
set_scroll_area (EMap *view)
{
EMapPrivate *priv;
priv = view->priv;
if (!GTK_WIDGET_REALIZED (GTK_WIDGET (view))) return;
if (!priv->hadj || !priv->vadj) return;
/* Set scroll increments */
priv->hadj->page_size = GTK_WIDGET (view)->allocation.width;
priv->hadj->page_increment = GTK_WIDGET (view)->allocation.width / 2;
priv->hadj->step_increment = SCROLL_STEP_SIZE;
priv->vadj->page_size = GTK_WIDGET (view)->allocation.height;
priv->vadj->page_increment = GTK_WIDGET (view)->allocation.height / 2;
priv->vadj->step_increment = SCROLL_STEP_SIZE;
/* Set scroll bounds and new offsets */
priv->hadj->lower = 0;
if (priv->map_render_pixbuf)
priv->hadj->upper = gdk_pixbuf_get_width (priv->map_render_pixbuf);
priv->vadj->lower = 0;
if (priv->map_render_pixbuf)
priv->vadj->upper = gdk_pixbuf_get_height (priv->map_render_pixbuf);
gtk_signal_emit_by_name (GTK_OBJECT (priv->hadj), "changed");
gtk_signal_emit_by_name (GTK_OBJECT (priv->vadj), "changed");
priv->xofs = CLAMP (priv->xofs, 0, priv->hadj->upper - priv->hadj->page_size);
priv->yofs = CLAMP (priv->yofs, 0, priv->vadj->upper - priv->vadj->page_size);
if (priv->hadj->value != priv->xofs)
{
priv->hadj->value = priv->xofs;
gtk_signal_handler_block_by_data (GTK_OBJECT (priv->hadj), view);
gtk_signal_emit_by_name (GTK_OBJECT (priv->hadj), "value_changed");
gtk_signal_handler_unblock_by_data (GTK_OBJECT (priv->hadj), view);
}
if (priv->vadj->value != priv->yofs)
{
priv->vadj->value = priv->yofs;
gtk_signal_handler_block_by_data (GTK_OBJECT (priv->vadj), view);
gtk_signal_emit_by_name (GTK_OBJECT (priv->vadj), "value_changed");
gtk_signal_handler_unblock_by_data (GTK_OBJECT (priv->vadj), view);
}
}
