Folks,
I am creating a xy linegraph widget for the first time, and I am
experiencing a double destroy method call during shutdown. Plus, I
would like some clarification on which api family to use for
params ;GtkObject or GObject, and a little help with naming a new
widget. I'm using gtk2-devel-2.8.17-1.fc5.1
Q1: Naming a new widget: Is it ok to name it gtk_linegraph_new() ?
- I named mine sk_linegraph_new(), but all the books i've read
did not hesitate to prefix their names with gtk_
Q2: API Families: GtkObjectClass vs GObjectClass for widget properties?
- I want the codeset to run anywhere GTK+/GDK is supported!
- I used GObjectClass methods ( get/set_property ) rather than
GtkObjectClass get/set_arg - initially not noticing the difference; does
it matter ?
Q3: Double-Destroy method calls: GtkWidgetClass->destroy get called at
least twice during shutdown and GTK_DESTROYED(widget) didn't seem to
work?
- With this widget and a few others, I've noticed that the destroy
method is called multiple times at program termination
- I included my realize/unrealize() methods as they are the only
methods related to this problem that I could find.
- Is there a GTK2 equivalent of GTK_DESTROYED(widget), to help
detect the 2nd+ call ?
- Is this a problem? can I safely ignore it?
[ FILE sklinegraph.h]
typedef struct _SkLineGraph
{
GtkWidget widget;
...
} SkLineGraph;
typedef struct _SkLineGraphClass
{
GtkWidgetClass parent_class;
} SkLineGraphClass;
[ FILE sklinegraph.c]
G_DEFINE_TYPE (SkLineGraph, sk_linegraph, GTK_TYPE_WIDGET)
static void sk_linegraph_class_init (SkLineGraphClass *class)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (class);
GtkObjectClass *gtkobject_class = GTK_OBJECT_CLASS (class);
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
gobject_class->set_property = sk_linegraph_set_property;
gobject_class->get_property = sk_linegraph_get_property;
gtkobject_class->destroy = sk_linegraph_destroy;
widget_class->size_allocate = sk_linegraph_size_allocate;
widget_class->size_request = sk_linegraph_size_request;
widget_class->realize = sk_linegraph_realize;
widget_class->unrealize = sk_linegraph_unrealize;
widget_class->expose_event = sk_linegraph_expose_event;
widget_class->motion_notify_event =
sk_linegraph_motion_notify_event;
widget_class->button_press_event = sk_linegraph_button_press_event;
g_object_class_install_property
(gobject_class,PROP_GRAPH_DRAWING_TYPE,
g_param_spec_boolean
("graph-drawing-type",
"Graph Drawing
Type",
"some text",
FALSE,
G_PARAM_READWRITE));
}
static void sk_linegraph_realize (GtkWidget *widget)
{
SkLineGraph *slg = NULL;
GdkWindowAttr attributes;
gint attributes_mask;
g_return_if_fail ( widget != NULL);
g_return_if_fail (IS_SK_LINEGRAPH (widget));
slg = SK_LINEGRAPH (widget);
GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
attributes.window_type = GDK_WINDOW_CHILD;
attributes.x = widget->allocation.x;
attributes.y = widget->allocation.y;
attributes.width = widget->allocation.width;
attributes.height = widget->allocation.height;
attributes.wclass = GDK_INPUT_OUTPUT;
attributes.visual = gtk_widget_get_visual (widget);
attributes.colormap = gtk_widget_get_colormap (widget);
attributes.event_mask = gtk_widget_get_events (widget) |
GDK_EXPOSURE_MASK |
GDK_BUTTON_PRESS_MASK |
GDK_POINTER_MOTION_MASK |
GDK_POINTER_MOTION_HINT_MASK;
attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL |
GDK_WA_COLORMAP;
widget->window = gdk_window_new (gtk_widget_get_parent_window
(widget), &attributes, attributes_mask);
gdk_window_set_user_data (widget->window, widget);
widget->style = gtk_style_attach (widget->style, widget->window);
gtk_style_set_background (widget->style, widget->window,
GTK_STATE_NORMAL);
if (slg->lgflags & LG_GRAPH_SCALED) {
sk_linegraph_manage_scaled_config (slg);
} else {
sk_linegraph_manage_regular_config (slg);
}
}
static void sk_linegraph_unrealize (GtkWidget *widget)
{
g_return_if_fail (widget != NULL);
g_return_if_fail (IS_SK_LINEGRAPH (widget));
if (GTK_WIDGET_CLASS (sk_linegraph_parent_class)->unrealize)
(* GTK_WIDGET_CLASS (sk_linegraph_parent_class)->unrealize)
(widget);
}
James,
________________________________________________________________________
Registered Linux User #270764
FC5 on Dual AMD 2400+ MPs
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