static gboolean
_adg_motion_notify_event(GtkWidget *widget, GdkEventMotion *event)
{
gboolean translating, local_space, global_space;
cairo_matrix_t map, inverted;
translating = (event->state & GDK_BUTTON2_MASK) == GDK_BUTTON2_MASK;
local_space = (event->state & ADG_GTK_MODIFIERS) == 0;
global_space = (event->state & ADG_GTK_MODIFIERS) == GDK_SHIFT_MASK;
if (translating && (local_space || global_space) &&
_adg_get_map(widget, local_space, &map, &inverted)) {
AdgGtkAreaPrivate *data = adg_gtk_area_get_instance_private((AdgGtkArea *) widget);
gdouble x = event->x - data->x_event;
gdouble y = event->y - data->y_event;
cairo_matrix_transform_distance(&inverted, &x, &y);
cairo_matrix_translate(&map, x, y);
data->x_event = event->x;
data->y_event = event->y;
_adg_set_map(widget, local_space, &map);
gtk_widget_queue_draw(widget);
/* Avoid to chain up the default handler:
* this event has been grabbed by this function */
return TRUE;
}
if (_ADG_OLD_WIDGET_CLASS->motion_notify_event == NULL)
return FALSE;
return _ADG_OLD_WIDGET_CLASS->motion_notify_event(widget, event);
}
static gboolean
_adg_scroll_event(GtkWidget *widget, GdkEventScroll *event)
{
gboolean zoom_in, zoom_out, local_space, global_space;
cairo_matrix_t map, inverted;
AdgGtkAreaPrivate *data;
double factor, x, y;
zoom_in = event->direction == GDK_SCROLL_UP;
zoom_out = event->direction == GDK_SCROLL_DOWN;
local_space = (event->state & ADG_GTK_MODIFIERS) == 0;
global_space = (event->state & ADG_GTK_MODIFIERS) == GDK_SHIFT_MASK;
if ((zoom_in || zoom_out) && (local_space || global_space) &&
_adg_get_map(widget, local_space, &map, &inverted)) {
data = ((AdgGtkArea *) widget)->data;
factor = zoom_in ? data->factor : 1. / data->factor;
x = event->x;
y = event->y;
cairo_matrix_transform_point(&inverted, &x, &y);
cairo_matrix_scale(&map, factor, factor);
cairo_matrix_translate(&map, x/factor - x, y/factor - y);
_adg_set_map(widget, local_space, &map);
gtk_widget_queue_draw(widget);
/* Avoid to chain up the default handler:
* this event has been grabbed by this function */
return TRUE;
}
if (_ADG_OLD_WIDGET_CLASS->scroll_event == NULL)
return FALSE;
return _ADG_OLD_WIDGET_CLASS->scroll_event(widget, event);
}
