My env. is GTK+2.0 with Glade-2.
I'm trying to draw a drawingarea with a background gthread...I have connected the signal expose and configure with the correspond event handler in callbacks.c
My main.c looks like...
....
1 /*
2 * Initial main.c file generated by Glade. Edit as required.
3 * Glade will not overwrite this file.
4 */
5
6 #ifdef HAVE_CONFIG_H
7 # include < config.h>
8 #endif
9
10 #include <gtk/gtk.h>
11
12 #include <glib.h>
13
14 #include "interface.h"
15 #include "support.h"
16 #include " callbacks.h "
17 #include "my_draw.h"
18
19 gpointer drawing_thread(gpointer data);
20
21 int
22 main (int argc, char *argv[])
23 {
24 GtkWidget *window1;
25 GtkWidget *aboutdialog1;
26
27 gtk_set_locale ();
28
29 if(!g_thread_supported()) g_thread_init(NULL);
30 gdk_threads_init();
31
32 GtkWidget *drawingarea1 = lookup_widget(window1,"drawingarea1");
33
34 gtk_init (&argc, &argv);
35
36 add_pixmap_directory (PACKAGE_DATA_DIR "/" PACKAGE "/pixmaps");
37
38 /*
39 * The following code was added by Glade to create one of each component
40 * (except popup menus), just so that you see something after building
41 * the project. Delete any components that you don't want shown initially.
42 */
43 window1 = create_window1 ();
44 gtk_widget_show (window1);
45 aboutdialog1 = create_aboutdialog1 ();
46 gtk_widget_show (aboutdialog1);
47
48 g_signal_connect(G_OBJECT(drawingarea1), "expose-event",G_CALLBACK(on_drawingarea1_expose_event), NULL);
49 g_signal_connect(G_OBJECT(drawingarea1), "configure-event",G_CALLBACK(on_drawingarea1_configure_event), NULL);
50
51 // drawing_thread
52 g_thread_create(drawing_thread, window1 , TRUE, NULL);
53
54 gdk_threads_enter();
55 gtk_main ();
56 gdk_threads_leave();
57 return 0;
58 }
59
and in the callbacks.c
92 gboolean
93 on_drawingarea1_expose_event (GtkWidget *widget,
94 GdkEventExpose *event,
95 gpointer user_data)
96 {
97
98 gdk_draw_drawable(widget->window,
99 widget->style->fg_gc[GTK_WIDGET_STATE (widget)],
100 draw_code_cache_pixmap,
101 event->area.x, event->area.y,
102 event->area.x, event->area.y,
103 event->area.width , event->area.height);
104 return FALSE;
105 }
106
140 gboolean
141 on_drawingarea1_configure_event (GtkWidget *widget,
142 GdkEventConfigure *event,
143 gpointer user_data)
144 {
145 if(draw_code_cache_pixmap)
146 g_object_unref(draw_code_cache_pixmap);
147
148 draw_code_cache_pixmap = gdk_pixmap_new(widget->window,
149 widget->allocation.width,
150 widget->allocation.height,
151 -1);
152
153 return FALSE;
154 }
and my draeing thread is
6 gpointer drawing_thread(gpointer data){
7 gint x_aix;
8 gint y_aix;
9 gint trace_len=0;
10 GtkWidget* sim_drawing_area = (GtkWidget*)data;
11
12 for(;;){
13 if(trace_len >= 50)
14 trace_len = 0;
15
16 gdk_threads_enter();
17
18 //gdk_draw_rectangle(_sim_drawing_data->sim_drawing_area->window,
19 gdk_draw_rectangle(draw_code_cache_pixmap,
20 sim_drawing_area->style->fg_gc[GTK_WIDGET_STATE (sim_drawing_area)],
21 TRUE,
22 0,
23 0,
24 trace_len,
25 20);
26 gdk_flush();
27 gdk_threads_leave();
28
29 trace_len++;
30 }
31 }
I'm created a pixmap in the on_drawingarea1_configure_event function, and connect this envnt handler with the corresponded signal.
But, as I execute the program, I got the following error msg...
(gui2:27742): Gdk-CRITICAL **: gdk_draw_rectangle: assertion `GDK_IS_DRAWABLE (drawable)' failed
(gui2:27742): Gdk-CRITICAL **: gdk_draw_rectangle: assertion `GDK_IS_DRAWABLE (drawable)' failed
(gui2:27742): Gdk-CRITICAL **: gdk_draw_rectangle: assertion `GDK_IS_DRAWABLE (drawable)' failed
Does any idea?
ThankX!!!!
Dave.
--
System on Chip Design Lab.
Dept. of Computer Science and Information Engineering,
National Chung Cheng University
E-mail : s88.tw@xxxxxxx
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